CELLNET DATA SYSTEMS INC
S-1/A, 1996-09-09
TELEGRAPH & OTHER MESSAGE COMMUNICATIONS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 9, 1996
    
   
                                                      REGISTRATION NO. 333-09537
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
                              -------------------
                           CELLNET DATA SYSTEMS, INC.
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                                   <C>                                   <C>
              DELAWARE                                4825                               94-2951096
  (State or other jurisdiction of         (Primary Standard Industrial                (I.R.S. Employer
   incorporation or organization)         Classification Code Number)              Identification Number)
</TABLE>
 
                               125 SHOREWAY ROAD
                              SAN CARLOS, CA 94070
                                 (415) 508-6000
         (Address, including zip code, and telephone number, including
            area code, of Registrant's principal executive offices)
                             ---------------------
                                 JOHN M. SEIDL
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                           CELLNET DATA SYSTEMS, INC.
                               125 SHOREWAY ROAD
                              SAN CARLOS, CA 94070
                                 (415) 508-6000
      (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)
                             ---------------------
                                   COPIES TO:
 
         BARRY E. TAYLOR, ESQ.                   JERRY V. ELLIOTT, ESQ.
        MICHAEL J. DANAHER, ESQ.                  SHEARMAN & STERLING
        TREVOR J. CHAPLICK, ESQ.                  599 LEXINGTON AVENUE
    WILSON SONSINI GOODRICH & ROSATI         NEW YORK, NEW YORK 10022-4676
        PROFESSIONAL CORPORATION                     (212) 848-4000
           650 PAGE MILL ROAD
    PALO ALTO, CALIFORNIA 94304-1050
             (415) 493-9300
 
                             ---------------------
 
    APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
    If any of the securities being registered on this form are to be offered  on
a  delayed or continuous basis pursuant to  Rule 415 under the Securities Act of
1933, check the following box.  / /
 
    If this Form  is filed  to register  additional securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and  list  the  Securities  Act registration  statement  number  of  the earlier
effective registration statement for the same offering.  / /
 
    If this Form  is a post-effective  amendment filed pursuant  to rule  462(c)
under  the Securities Act, check  the following box and  list the Securities Act
registration statement number  of the earlier  effective registration  statement
for the same offering.  / /
 
    If  delivery of the prospectus is expected  to be made pursuant to rule 434,
please check the following box.
                             ---------------------
 
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
                                                                       PROPOSED MAXIMUM    PROPOSED MAXIMUM
             TITLE OF EACH CLASS OF                   AMOUNT TO         OFFERING PRICE        AGGREGATE           AMOUNT OF
          SECURITIES TO BE REGISTERED             BE REGISTERED (1)     PER SHARE (2)     OFFERING PRICE (2)   REGISTRATION FEE
<S>                                               <C>                 <C>                 <C>                 <C>
Common Stock, $0.001 par value..................   5,750,000 shares         $21.00           $120,750,000          $41,635
</TABLE>
    
 
   
(1) Includes  750,000 shares  that  the U.S.  Underwriters  have the  option  to
    purchase to cover over-allotments, if any.
    
 
(2)  Estimated  solely  for  the  purpose  of  calculating  the  amount  of  the
    registration fee in  accordance with Rule  457 under the  Securities Act  of
    1933, as amended.
                             ---------------------
 
    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT  SHALL THEREAFTER BECOME EFFECTIVE IN  ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT  OF 1933  OR UNTIL  THE REGISTRATION  STATEMENT SHALL  BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH SECTION 8(a),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE
 
    This  Registration Statement contains two forms of Prospectus: (i) one to be
used in connection with an offering in  the United States and Canada (the  "U.S.
Prospectus")  and (ii) the other to be used in a concurrent offering outside the
United States and Canada (the "International Prospectus"). The two  prospectuses
are identical in all material respects except for the front cover page. The form
of  U.S. Prospectus is included herein and  is followed by the alternate page to
be  used  in  the   International  Prospectus.  The   alternate  page  for   the
International   Prospectus  included  herein  is  labeled  "Alternate  Page  for
International Prospectus." Final forms of each Prospectus will be filed with the
Securities and Exchange Commission under Rule 424(b).
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES
MAY  NOT  BE SOLD  NOR MAY  OFFERS  TO BUY  BE ACCEPTED  PRIOR  TO THE  TIME THE
REGISTRATION STATEMENT BECOMES EFFECTIVE.  THIS PROSPECTUS SHALL NOT  CONSTITUTE
AN   OFFER   TO   SELL  OR   THE   SOLICITATION   OF  AN   OFFER   TO   BUY  NOR
SHALL THERE BE ANY SALE  OF THESE SECURITIES IN ANY  STATE IN WHICH SUCH  OFFER,
SOLICITATION  OR SALE WOULD  BE UNLAWFUL PRIOR  TO REGISTRATION OR QUALIFICATION
UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
PROSPECTUS (SUBJECT TO COMPLETION)
ISSUED SEPTEMBER 9, 1996
    
 
   
                                5,000,000 SHARES
    
 
                                     [LOGO]
                                  COMMON STOCK
                               -----------------
 
   
ALL OF THE SHARES OF COMMON STOCK OFFERED HEREBY ARE BEING SOLD BY THE  COMPANY.
OF THE 5,000,000 SHARES OF COMMON STOCK BEING OFFERED HEREBY, 4,000,000 SHARES
  ARE  BEING OFFERED  INITIALLY IN  THE UNITED STATES  AND CANADA  BY THE U.S.
  UNDERWRITERS AND 1,000,000 SHARES ARE BEING OFFERED INITIALLY OUTSIDE  THE
    UNITED  STATES AND CANADA  BY THE INTERNATIONAL  UNDERWRITERS. PRIOR TO
     THIS OFFERING, THERE HAS BEEN NO PUBLIC MARKET FOR THE COMMON STOCK OF
     THE COMPANY.  IT  IS CURRENTLY  ESTIMATED  THAT THE  INITIAL  PUBLIC
       OFFERING  PRICE PER SHARE WILL BE  BETWEEN $19.00 AND $21.00. SEE
         "UNDERWRITERS" FOR A  DISCUSSION OF THE  FACTORS CONSIDERED  IN
                 DETERMINING THE INITIAL PUBLIC OFFERING PRICE.
    
 
   
CONCURRENTLY  WITH THE CLOSING  OF THIS OFFERING,  NORTHERN STATES POWER COMPANY
("NSP") AND UNION ELECTRIC  COMPANY ("UE") WILL  PURCHASE DIRECTLY FROM  THE
    COMPANY  SHARES OF  COMMON STOCK HAVING  AN AGGREGATE  PURCHASE PRICE OF
    $15,000,000 AND  $10,000,000, RESPECTIVELY.  ALL  OF SUCH  SHARES  OF
       COMMON  STOCK TO BE PURCHASED BY NSP AND UE WILL BE PURCHASED AT
         THE INITIAL PER SHARE  PRICE TO PUBLIC  SET FORTH BELOW,  LESS
         THE  UNDERWRITING DISCOUNT  IN THE CASE  OF UE  AND LESS A
             SEPARATE DISCOUNT  IN THE  CASE OF  NSP. SEE  "UTILITY
                               STOCK PURCHASES."
    
                            ------------------------
 
   
THE COMMON STOCK HAS BEEN APPROVED FOR QUOTATION ON THE NASDAQ NATIONAL MARKET,
                    SUBJECT TO OFFICIAL NOTICE OF ISSUANCE.
    
                            ------------------------
 
   
 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS" COMMENCING ON
                                 PAGE 8 HEREOF.
    
                              -------------------
 
THESE  SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS   THE
    SECURITIES  AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION
      PASSED UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS  PROSPECTUS.  ANY
       REPRESENTATION   TO   THE   CONTRARY   IS   A   CRIMINAL  OFFENSE.
                              -------------------
 
                             PRICE $       A SHARE
                              -------------------
 
<TABLE>
<CAPTION>
                                                                            UNDERWRITING
                                                          PRICE TO         DISCOUNTS AND        PROCEEDS TO
                                                           PUBLIC          COMMISSIONS(1)        COMPANY(2)
                                                     ------------------  ------------------  ------------------
<S>                                                  <C>                 <C>                 <C>
PER SHARE..........................................  $                   $                   $
TOTAL (3)..........................................  $                   $                   $
</TABLE>
 
- ---------
  (1) THE  COMPANY HAS  AGREED  TO INDEMNIFY  THE UNDERWRITERS  AGAINST  CERTAIN
     LIABILITIES,  INCLUDING LIABILITIES  UNDER THE  SECURITIES ACT  OF 1933, AS
     AMENDED. SEE "UNDERWRITERS."
   
  (2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT $1,200,000.
    
   
  (3) THE  COMPANY HAS  GRANTED  THE U.S.  UNDERWRITERS AN  OPTION,  EXERCISABLE
     WITHIN  30  DAYS OF  THE DATE  HEREOF, TO  PURCHASE UP  TO AN  AGGREGATE OF
     750,000  ADDITIONAL  SHARES  AT  THE  PRICE  TO  PUBLIC  LESS  UNDERWRITING
     DISCOUNTS  AND COMMISSIONS FOR THE  PURPOSE OF COVERING OVER-ALLOTMENTS, IF
     ANY. IF THE U.S. UNDERWRITERS EXERCISE SUCH OPTION IN FULL, THE TOTAL PRICE
     TO PUBLIC, UNDERWRITING DISCOUNTS AND  COMMISSIONS AND PROCEEDS TO  COMPANY
     WILL BE $      , $      AND $      , RESPECTIVELY. SEE "UNDERWRITERS."
    
                            ------------------------
 
    THE  SHARES ARE OFFERED, SUBJECT TO PRIOR  SALE, WHEN, AS AND IF ACCEPTED BY
THE UNDERWRITERS NAMED HEREIN AND SUBJECT  TO APPROVAL OF CERTAIN LEGAL  MATTERS
BY  SHEARMAN  & STERLING,  COUNSEL  FOR THE  UNDERWRITERS.  IT IS  EXPECTED THAT
DELIVERY OF THE SHARES WILL BE MADE ON OR ABOUT             , 1996 AT THE OFFICE
OF MORGAN STANLEY & CO. INCORPORATED,  NEW YORK, N.Y., AGAINST PAYMENT  THEREFOR
IN IMMEDIATELY AVAILABLE FUNDS.
                              -------------------
 
MORGAN STANLEY & CO.
       INCORPORATED
            COWEN & COMPANY
 
                                        MONTGOMERY SECURITIES
 
                                                               SMITH BARNEY INC.
 
           , 1996
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                         [ALTERNATIVE PAGE FOR INTERNATIONAL PROSPECTUS]
   
PROSPECTUS (SUBJECT TO COMPLETION)
ISSUED SEPTEMBER 9, 1996
    
   
                                5,000,000 SHARES
    
 
   
                                     [LOGO]
 
                                  COMMON STOCK
    
                               -----------------
   
ALL OF THE SHARES OF COMMON STOCK OFFERED HEREBY ARE BEING SOLD BY CELLNET  DATA
SYSTEMS,  INC. OF  THE 5,000,000 SHARES  OF COMMON STOCK  BEING OFFERED HEREBY,
 1,000,000 SHARES ARE  BEING OFFERED  INITIALLY OUTSIDE THE  UNITED STATES  AND
 CANADA  BY  THE INTERNATIONAL  UNDERWRITERS AND  4,000,000 SHARES  ARE BEING
   OFFERED  INITIALLY  IN  THE  UNITED  STATES  AND  CANADA  BY  THE   U.S.
     UNDERWRITERS.  PRIOR TO THIS OFFERING, THERE HAS BEEN NO PUBLIC MARKET
     FOR THE COMMON STOCK OF THE  COMPANY. IT IS CURRENTLY ESTIMATED  THAT
      THE  INITIAL PUBLIC OFFERING PRICE PER  SHARE WILL BE BETWEEN $19.00
      AND $21.00. SEE   "UNDERWRITERS"  FOR A DISCUSSION  OF THE  FACTORS
          CONSIDERED IN DETERMINING THE INITIAL PUBLIC OFFERING PRICE.
    
 
   
CONCURRENTLY  WITH THE CLOSING  OF THIS OFFERING,  NORTHERN STATES POWER COMPANY
("NSP") AND  UNION ELECTRIC  COMPANY ("UE")  WILL PURCHASE  DIRECTLY FROM  THE
  COMPANY  SHARES  OF  COMMON  STOCK HAVING  AN  AGGREGATE  PURCHASE  PRICE OF
  $15,000,000 AND $10,000,000, RESPECTIVELY. ALL  OF SUCH SHARES OF  COMMON
     STOCK  TO BE PURCHASED BY NSP AND UE WILL BE PURCHASED AT THE INITIAL
      PER SHARE PRICE  TO PUBLIC  SET FORTH BELOW,  LESS THE  UNDERWRITING
      DISCOUNT    IN   THE   CASE   OF    UE   AND   LESS   A   SEPARATE
                            DISCOUNT IN THE  CASE OF  NSP. SEE  "UTILITY
                               STOCK PURCHASES."
    
                            ------------------------
 
   
THE COMMON STOCK HAS BEEN APPROVED FOR QUOTATION ON THE NASDAQ NATIONAL MARKET,
                    SUBJECT TO OFFICIAL NOTICE OF ISSUANCE.
    
                            ------------------------
 
   
        THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
                          COMMENCING ON PAGE 8 HEREOF.
    
                              -------------------
 
THESE  SECURITIES  HAVE  NOT  BEEN APPROVED  OR  DISAPPROVED  BY  THE SECURITIES
  AND EXCHANGE  COMMISSION OR  ANY  STATE SECURITIES  COMMISSION NOR  HAS  THE
    SECURITIES  AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION
      PASSED UPON  THE  ACCURACY  OR  ADEQUACY  OF  THIS  PROSPECTUS.  ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------
 
                            PRICE $         A SHARE
                              -------------------
 
<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                        PRICE TO           DISCOUNTS AND         PROCEEDS TO
                                                         PUBLIC           COMMISSIONS(1)         COMPANY(2)
                                                   -------------------  -------------------  -------------------
<S>                                                <C>                  <C>                  <C>
PER SHARE........................................           $                    $                    $
TOTAL (3)........................................           $                    $                    $
</TABLE>
 
- ---------
  (1)    THE  COMPANY HAS AGREED  TO INDEMNIFY THE  UNDERWRITERS AGAINST CERTAIN
       LIABILITIES, INCLUDING LIABILITIES UNDER THE  SECURITIES ACT OF 1933,  AS
       AMENDED. SEE "UNDERWRITERS."
   
  (2)      BEFORE  DEDUCTING  EXPENSES  PAYABLE  BY  THE  COMPANY  ESTIMATED  AT
       $1,200,000.
    
   
  (3)    THE COMPANY HAS  GRANTED THE U.S.  UNDERWRITERS AN OPTION,  EXERCISABLE
       WITHIN  30 DAYS  OF THE DATE  HEREOF, TO  PURCHASE UP TO  AN AGGREGATE OF
       750,000 ADDITIONAL  SHARES  AT  THE PRICE  TO  PUBLIC  LESS  UNDERWRITING
       DISCOUNTS AND COMMISSIONS FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS, IF
       ANY.  IF THE  U.S. UNDERWRITERS EXERCISE  SUCH OPTION IN  FULL, THE TOTAL
       PRICE TO PUBLIC, UNDERWRITING DISCOUNTS  AND COMMISSIONS AND PROCEEDS  TO
       COMPANY  WILL BE  $        ,  $         AND $         , RESPECTIVELY. SEE
       "UNDERWRITERS."
    
                            ------------------------
 
    THE SHARES ARE OFFERED, SUBJECT TO PRIOR  SALE, WHEN, AS AND IF ACCEPTED  BY
THE  UNDERWRITERS NAMED HEREIN AND SUBJECT  TO APPROVAL OF CERTAIN LEGAL MATTERS
BY SHEARMAN  & STERLING,  COUNSEL  FOR THE  UNDERWRITERS.  IT IS  EXPECTED  THAT
DELIVERY OF THE SHARES WILL BE MADE ON OR ABOUT             , 1996 AT THE OFFICE
OF  MORGAN STANLEY & CO. INCORPORATED,  NEW YORK, N.Y., AGAINST PAYMENT THEREFOR
IN IMMEDIATELY AVAILABLE FUNDS.
                              -------------------
 
MORGAN STANLEY & CO.
       INTERNATIONAL
 
                        COWEN & COMPANY
 
                                         MONTGOMERY SECURITIES
 
                                                               SMITH BARNEY INC.
 
           , 1996
<PAGE>
 
   
<TABLE>
<S>                                               <C>
MSA License Map--June 1996                        CellNet holds 50 radio frequency licenses in 42 of the top 60
                                                  metropolitan statistical areas allowing it to target utilities
                                                  representing a majority of the electric, gas and water meters in
                                                  the United States. CellNet also has a number of other licenses
                                                  pending.
</TABLE>
    
 
   
Albany, NY
Allentown, PA
Austin, TX
Boston, MA
Buffalo, NY
Charlotte, NC
Cincinnati, OH
Cleveland, OH
    
 
   
Columbus, OH
Dayton, OH
Fresno, CA
Grand Rapids, MI
Greensboro, NC (2)
Hartford, CT
Honolulu, HI
Indianapolis, IN
Jacksonville, FL
    
 
   
Kansas City, MO
Las Vegas, NV
Los Angeles, CA
Louisville, KY
Memphis, TN
Miami, FL
Milwaukee, WI
Minneapolis, MN (2)
    
 
   
Norfolk, VA (2)
Oklahoma City, OK
Phoenix, AZ
Pittsburgh, PA (2)
Portland, OR (2)
Providence, RI (2)
Raleigh, NC
Richmond, VA
Salt Lake City, UT
    
 
   
San Antonio, TX
San Diego, CA
Scranton, PA
Seattle, WA
St. Louis, MO (3)
Tucson, AZ
Tulsa, OK
West Palm Beach, FL
    
 
   
                  [MAP: Map of United States showing the 42
                         MSAs in which the Company held radio
                         frequency licenses as of June 30,
                         1996]
    
 
                              -------------------
 
   
IN  CONNECTION WITH  THIS OFFERING,  THE UNDERWRITERS  MAY OVER-ALLOT  OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
LEVELS ABOVE  THAT  WHICH MIGHT  OTHERWISE  PREVAIL  IN THE  OPEN  MARKET.  SUCH
TRANSACTIONS  MAY  BE  EFFECTED ON  THE  NASDAQ  NATIONAL MARKET,  IN  THE OVER-
THE-COUNTER  MARKET  OR  OTHERWISE.  SUCH  STABILIZING,  IF  COMMENCED,  MAY  BE
DISCONTINUED AT ANY TIME.
    
 
<PAGE>
   
                                         The CellNet Network System Architecture
    
 
   
Utilities can quickly pinpoint and resolve outages with CellNet Network Meter
Reading services.
    
 
   
[Graphic: Simulation of computer monitor showing power outage application of
         CellNet's system]
    
 
   
With real-time, on-line access to customer meter information, utilities can
offer customers new services such as real-time pricing, time-of-use rates, and
best-rate analysis.
    
 
   
[Graphic: Simulation of computer monitor showing best-rate analysis application
         of CellNet's system]
    
 
   
    Flexible, Scalable
       Architecture
    
 
   
         CellNet's open, standards-based system architecture is designed to
         enable the integration of future systems and technologies to
         accommodate changing needs while protecting a utility's existing
         network infrastructure investments.
    
 
   
         Isolating each underlying network technology provides a high degree of
         adaptability; for example, in a rural area, the CellNet network may
         employ satellite or telephone links in addition to other digital radio
         links if needed.
    
 
   
         Because the CellNet system is flexible and scalable, once deployment
         begins, new capabilities can be easily added via remote software
         upgrades, to meet growing capacity and/or service needs.
    
<PAGE>
   
[Graphic: CellNet Network System Architecture showing components and system
         hierarchy]
    
 
   
System Controller Network
    
   
The System Controller collects data from throughout the system and loads it into
a relational database for access via application gateways using industry
standard TCP/IP protocols.
    
 
   
[Photo: System Controller]
    
 
   
Wireless Wide Area Network (WAN)
    
   
Each WAN is made up of microcellular LANs operating independently to provide
data communications from endpoint devices.
    
 
   
[Photo: CellMaster and MicroCell controller units]
    
 
   
Microcellular Local Area Network (LAN)
    
   
The LAN collects data from endpoints and forwards the data to a MicroCell
Controller at the center of each microcell.
    
 
   
[Photo: electric utility meter]
    
<PAGE>
   
    NO  PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY  REPRESENTATION NOT CONTAINED IN THIS  PROSPECTUS
AND,  IF GIVEN OR  MADE, SUCH INFORMATION  OR REPRESENTATION MUST  NOT BE RELIED
UPON AS  HAVING BEEN  AUTHORIZED BY  THE  COMPANY OR  BY ANY  UNDERWRITER.  THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY  ANY OF THE SECURITIES  OFFERED HEREBY TO ANY  PERSON IN ANY JURISDICTION IN
WHICH IT IS  UNLAWFUL TO  MAKE SUCH  AN OFFER  OR SOLICITATION  TO SUCH  PERSON.
NEITHER  THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL UNDER
ANY CIRCUMSTANCE CREATE ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
    
 
    UNTIL              , 1996 (25 DAYS AFTER THE COMMENCEMENT OF THE  OFFERING),
ALL  DEALERS  EFFECTING  TRANSACTIONS  IN  THE  COMMON  STOCK,  WHETHER  OR  NOT
PARTICIPATING IN THIS  DISTRIBUTION, MAY  BE REQUIRED TO  DELIVER A  PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER
A  PROSPECTUS WHEN ACTING AS UNDERWRITERS  AND WITH RESPECT TO UNSOLD ALLOTMENTS
OR SUBSCRIPTIONS.
                              -------------------
 
    For investors outside the United States: No action has been or will be taken
in any jurisdiction by the Company or any Underwriter that would permit a public
offering of the Common Stock or possession or distribution of this Prospectus in
any jurisdiction where action  for that purpose is  required, other than in  the
United  States. Persons into whose possession this Prospectus comes are required
by the Company and  the Underwriters to inform  themselves about and to  observe
any restrictions as to, the offering of the Common Stock and the distribution of
this Prospectus.
                              -------------------
 
    In  this Prospectus  references to  "dollars" and  "$" are  to United States
Dollars, and the  terms "United  States" and "U.S."  mean the  United States  of
America,  its states, its territories, its  possessions and all areas subject to
its jurisdiction.
                              -------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Prospectus Summary.........................................................................................          4
Risk Factors...............................................................................................          8
Use of Proceeds............................................................................................         19
Utility Stock Purchases....................................................................................         19
Dividend Policy............................................................................................         19
Capitalization.............................................................................................         20
Dilution...................................................................................................         21
Selected Consolidated Financial Data.......................................................................         22
Management's Discussion and Analysis of Financial Condition and Results of Operations......................         23
Business...................................................................................................         29
Management.................................................................................................         47
Certain Transactions.......................................................................................         54
Principal Stockholders.....................................................................................         57
Description of Capital Stock...............................................................................         60
Shares Eligible for Future Sale............................................................................         64
Underwriters...............................................................................................         66
Legal Matters..............................................................................................         69
Experts....................................................................................................         69
Additional Information.....................................................................................         69
Glossary...................................................................................................        A-1
Index to Consolidated Financial Statements.................................................................        F-1
</TABLE>
    
 
                                       3
<PAGE>
                               PROSPECTUS SUMMARY
 
   
    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION, INCLUDING "RISK FACTORS" AND THE CONSOLIDATED FINANCIAL  STATEMENTS
AND  NOTES  THERETO, APPEARING  ELSEWHERE IN  THIS PROSPECTUS.  UNLESS OTHERWISE
INDICATED, ALL INFORMATION  IN THIS PROSPECTUS  (I) ASSUMES NO  EXERCISE OF  THE
U.S. UNDERWRITERS' OVER-ALLOTMENT OPTION, (II) REFLECTS THE AUTOMATIC CONVERSION
OF  ALL  OUTSTANDING SHARES  OF THE  COMPANY'S REDEEMABLE  CONVERTIBLE PREFERRED
STOCK AND  CONVERTIBLE PREFERRED  STOCK (COLLECTIVELY,  "PREFERRED STOCK")  INTO
COMMON  STOCK EFFECTIVE  UPON THE  CLOSING OF  THIS OFFERING,  (III) ASSUMES THE
EXERCISE OF WARRANTS TO PURCHASE 4,132,970 SHARES OF COMMON STOCK EFFECTIVE UPON
THE CLOSING OF THIS OFFERING, (IV) GIVES EFFECT TO A 2-FOR-1 SPLIT OF THE COMMON
STOCK WHICH  WILL BE  EFFECTED PRIOR  TO THE  DATE OF  THIS PROSPECTUS  AND  (V)
ASSUMES  THE SALE OF 937,500  AND 533,333 SHARES OF COMMON  STOCK TO NSP AND UE,
RESPECTIVELY, CONCURRENTLY WITH THE CLOSING OF THIS OFFERING AT AN ASSUMED PRICE
OF $16.00  PER SHARE  AND $18.75  PER SHARE,  RESPECTIVELY. SEE  "UTILITY  STOCK
PURCHASES," "DESCRIPTION OF CAPITAL STOCK" AND "UNDERWRITERS." REFERENCES HEREIN
TO  "CELLNET"  OR THE  "COMPANY" REFER  TO  CELLNET DATA  SYSTEMS, INC.  AND ITS
SUBSIDIARIES. THE SHARES OFFERED  HEREBY ARE SUBJECT TO  A HIGH DEGREE OF  RISK.
SEE  "RISK FACTORS." CERTAIN INFORMATION CONTAINED IN THIS SUMMARY AND ELSEWHERE
IN THIS PROSPECTUS, INCLUDING INFORMATION WITH REGARD TO THE COMPANY'S  EXPECTED
WIRELESS  DATA COMMUNICATIONS  NETWORK DEPLOYMENTS AND  OPERATIONS, ITS STRATEGY
FOR MARKETING  AND DEPLOYING  SUCH NETWORKS  AND RELATED  FINANCING  ACTIVITIES,
CONTAINS  FORWARD-LOOKING STATEMENTS  THAT INVOLVE RISKS  AND UNCERTAINTIES. THE
COMPANY'S ACTUAL RESULTS MAY DIFFER MATERIALLY FROM THE RESULTS DISCUSSED IN THE
FORWARD-LOOKING STATEMENTS. FACTORS THAT MIGHT CAUSE SUCH A DIFFERENCE  INCLUDE,
BUT  ARE  NOT  LIMITED  TO, THOSE  DISCUSSED  IN  "RISK  FACTORS," "MANAGEMENT'S
DISCUSSION AND ANALYSIS OF  FINANCIAL CONDITION AND  RESULTS OF OPERATIONS"  AND
"BUSINESS."
    
 
                                  THE COMPANY
 
   
    The  Company designs, builds, owns and operates innovative wireless networks
capable of providing  low-cost real-time status  and event monitoring  of up  to
several  million  fixed  endpoints.  The primary  application  of  the Company's
network is to provide  network meter reading ("NMR")  services to electric,  gas
and  water utility  companies pursuant  to long-term  contracts. The  Company is
currently building  wireless networks  to provide  NMR services  to Kansas  City
Power  & Light Company ("KCPL")  and Union Electric Company  ("UE") in St. Louis
covering a total of approximately 1,220,000  meters, of which more than  105,000
meters were in revenue service as of June 30, 1996. In addition, the Company has
recently  entered into separate  services agreements with  Northern States Power
Company ("NSP") in Minneapolis and Puget  Sound Power & Light Company  ("Puget")
in  Washington  State, pursuant  to which  it has  contracted to  build wireless
networks  to  provide  NMR  services  covering  an  aggregate  of  approximately
1,015,000  additional meters, including 1,000,000  meters under the NSP Services
Agreement and  an initial  installation consisting  of 15,000  meters under  the
Puget  Services  Agreement.  CellNet  also  currently  provides  certain network
distribution  automation  services  to  electric  utility  customers   including
monitoring  and control of power  distribution equipment. CellNet's network uses
radio devices fitted  to existing utility  meters to read  and report data  from
each meter every few minutes. Through efficient use of radio frequency spectrum,
the  Company's  networks will  have substantial  additional capacity  to service
non-utility applications that  require low-cost monitoring  of fixed  endpoints,
such  as  home security  and remote  status monitoring  of vending  machines and
office equipment. The Company is working with industry leaders in those  markets
to encourage further development of such applications.
    
 
   
    CellNet believes it has a first-to-market opportunity to offer wireless data
communications   services  on  a  commercial  scale  for  utility  and  selected
non-utility applications. CellNet's  network is distinguished  by the  following
advantages:
    
    - infrastructure  and  operating  costs  sufficiently  low  to  permit  cost
      effective  utility  meter  reading   and  other  fixed  point   monitoring
      applications;
    - highly  efficient use  of spectrum  -- the  equivalent of  approximately a
      single voice channel is needed to operate a network;
    - proprietary  software  specifically  designed  to  manage  real-time  data
      collection from up to several million endpoints; and
   
    - open system architecture designed to allow new applications to be added to
      the CellNet system.
    
 
                                       4
<PAGE>
   
    Utilities are under increasing regulatory and competitive pressures. CellNet
offers  an  outsourced solution  which  enables utilities  to  offer time-of-use
pricing plans, peak demand monitoring, real-time response to billing  inquiries,
real-time  power  outage detection,  on-demand  meter reads,  customized billing
functions and distribution  automation. The  Company believes  its NMR  services
provide  utilities with an effective solution to  many of the demands created by
increased regulatory  and competitive  pressures  within the  utility  industry.
CellNet's  system allows utilities to respond effectively to regulatory changes,
reduce costs, defer capital spending and enhance their operating efficiencies.
    
 
   
    CellNet's strategy  is to  deploy  and operate  a  series of  wireless  data
communications  networks pursuant  to long-term  contracts with  utility company
customers and  to earn  recurring revenues  by providing  NMR services  to  such
utilities  and  by  using  the  network  to  support  a  variety  of non-utility
applications. Principal  elements of  CellNet's strategy  include (i)  focus  on
utility  markets, (ii)  promote development  of non-utility  applications, (iii)
form strategic alliances to enhance NMR services and offer additional  services,
(iv)  pursue international expansion and (v)  outsource a substantial portion of
its manufacturing and installation activities.
    
 
   
    The Company is actively  targeting those utilities which  operate in the  60
largest  Metropolitan Statistical Areas ("MSAs"),  which represent a majority of
the 225 million electric, gas and water meters in the United States. The Company
believes that utilities operating in these  densely populated areas will be  the
first  to  experience heightened  competitive and  regulatory pressures,  and as
such, will be most  likely to benefit from  the Company's services. The  Company
believes  that these competitive and regulatory pressures have recently prompted
utilities in the United States to undertake increased measures to improve  their
efficiency and service levels.
    
 
   
    CellNet's  proprietary  technology  enables the  Company  to  make extremely
efficient use of spectrum. As a result, relative to other wireless services, the
Company has been able to acquire frequency  at a very low cost. The Company  had
capitalized  $762,000 for license fees and related  expenses as of June 30, 1996
and has acquired  50 spectrum licenses  in 42 of  the top 60  MSAs. The  Company
believes  that it will be able to  obtain additional spectrum at reasonable cost
if required. The Company has focused its spectrum acquisition strategy on  these
top 60 markets.
    
 
   
    The  Company believes its spectrum-efficient  networks will have substantial
excess capacity  to  service  non-utility applications  which  require  low-cost
monitoring  of  fixed  endpoints.  Potential  non-utility  applications  of  the
Company's systems include  home security,  remote status  monitoring of  vending
machines,  office  equipment,  parking  meters and  other  equipment  and remote
control of traffic lights. The Company is working with industry leaders such  as
Ameritech,   Hewlett-Packard,  Honeywell,  Inc.,  Real   Time  Data,  Inc.,  and
Interactive  Technologies,  Inc.  to  develop  such  applications.  The  Company
believes  that  its  utility  networks will  provide  an  excellent  platform to
position  the  Company  as  a  leading  wholesale  provider  of  wireless   data
communications services for such non-utility applications.
    
 
   
    The Company believes that a significant international market also exists for
its services with several hundred million electric, gas and water meters outside
of  the United States. The Company's strategy is to pursue international markets
through joint  ventures.  The  Company  is  currently  exploring  projects  with
electric utilities in the U.K., Singapore and Thailand.
    
 
                                       5
<PAGE>
                                  THE OFFERING
 
   
<TABLE>
<S>                                               <C>
Common Stock Offered:
  U.S. Offering (1).............................  4,000,000 shares
  International Offering........................  1,000,000 shares
      Total Common Stock Offered (1)............  5,000,000 shares
Common Stock to be outstanding after the
 Offering (1)(2)................................  40,518,967 shares
Use of proceeds.................................  For general corporate purposes, including
                                                  working capital, capital requirements
                                                  (capital expenditures and negative
                                                  operating cash flow) in connection with
                                                  the installation and operation of the
                                                  Company's networks and research and
                                                  development expenses. See "Use of
                                                  Proceeds."
Nasdaq National Market Symbol...................  CNDS
</TABLE>
    
 
   
    In  addition, NSP  and UE  have agreed  to acquire  $15.0 million  and $10.0
million, respectively, of  restricted Common  Stock from the  Company (the  "NSP
Purchase"  and the "UE Purchase," respectively, and together, the "Utility Stock
Purchases") concurrently with the  closing of this  Offering. NSP will  purchase
937,500  shares of  Common Stock at  a purchase  price of $16.00  per share (the
initial public offering price, less a discount  of up to 20%, which discount  is
dependent  upon entering into a  letter of intent and  the signing of a services
agreement with Wisconsin Electric Power Company for at least 750,000 meters  (if
neither  such event occurs, the purchase price per share will be adjusted to 90%
of the initial public  offering price; and  if only one  such event occurs,  the
purchase  price per share will be adjusted to 85% of the initial public offering
price)). UE will purchase 533,333 shares of Common Stock at a purchase price  of
$18.75  per  share  (the initial  public  offering price  less  the underwriting
discounts and commissions). Upon  the closing of this  Offering and the  Utility
Stock   Purchases,  NSP  and   UE  will  own   approximately  2.31%  and  1.32%,
respectively, of  the  Common  Stock.  The  closing  of  this  Offering  is  not
conditioned  upon the closing of the Utility Stock Purchases. See "Utility Stock
Purchases."
    
- ---------
(1) Assumes the U.S. Underwriters' over-allotment  option is not exercised.  See
    "Underwriters."
 
   
(2) Based  on the number of shares outstanding as of June 30, 1996, after giving
    effect to the automatic  conversion of all  outstanding shares of  Preferred
    Stock  into Common Stock and the  exercise of warrants to purchase 4,132,970
    shares of Common  Stock effective upon  the closing of  this Offering.  Also
    includes  the  sale of  1,470,833  shares of  Common  Stock pursuant  to the
    Utility Stock Purchases concurrently with the closing of this Offering.  See
    "Utility  Stock  Purchases."  Excludes  3,779,136  shares  of  Common  Stock
    issuable upon exercise  of outstanding  stock options  as of  June 30,  1996
    granted  under the Company's 1992 Stock Option Plan and 1994 Stock Plan with
    a weighted average exercise price of $0.625 per share. Also excludes  52,610
    shares  of Common Stock issuable upon exercise of warrants outstanding as of
    June 30, 1996 with a weighted average exercise price of $7.59 per share. See
    "Management --  Incentive Stock  Plans," "Description  of Capital  Stock  --
    Warrants" and Note 7 to Consolidated Financial Statements.
    
 
                              -------------------
 
   
    CELLNET WAS INCORPORATED IN CALIFORNIA IN OCTOBER 1984 AND REINCORPORATED IN
DELAWARE  IN AUGUST 1996. CELLNET'S  SUBSIDIARIES INCLUDE CELLNET DATA SERVICES,
INC., CELLNET  DATA  SERVICES (IS),  INC.,  CELLNET DATA  SERVICES  (KC),  INC.,
CELLNET  DATA  SERVICES  (MSP),  INC.,  CELLNET  DATA  SERVICES  (SL),  INC., CN
FREQUENCY (KC),  INC., CN  FREQUENCY (MSP),  INC., CELLNET  DATA SERVICES  (SF),
INC., CN FREQUENCY (SL), INC., CN WAN CORP. AND DAC (UK), LIMITED. THE COMPANY'S
PRINCIPAL  EXECUTIVE  OFFICES  ARE LOCATED  AT  125 SHOREWAY  ROAD,  SAN CARLOS,
CALIFORNIA 94070. THE TELEPHONE NUMBER AT SUCH ADDRESS IS (415) 508-6000.
    
 
                                       6
<PAGE>
                 SUMMARY CONSOLIDATED FINANCIAL AND OTHER DATA
 
   
    The following table sets forth summary consolidated financial and other data
of the Company  for each of  the three years  in the period  ended December  31,
1995,  for the six months ended June 30, 1995 and 1996 and at June 30, 1996. The
financial information data were derived from, and should be read in  conjunction
with,  "Management's Discussion and Analysis  of Financial Condition and Results
of Operations" and the Consolidated Financial Statements of the Company and  the
Notes thereto included elsewhere in this Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS
                                                              YEAR ENDED DECEMBER 31,           ENDED JUNE 30,
                                                         ---------------------------------  ----------------------
                                                           1993        1994        1995        1995        1996
                                                         ---------  ----------  ----------  ----------  ----------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                      <C>        <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
  Revenues.............................................  $   1,757  $    1,651  $    2,126  $    1,291  $      420
  Costs and expenses:
      Cost of revenues.................................      1,840       1,191       5,129       1,931       3,483
      Research and development.........................      5,262       9,693      22,380       6,735      13,009
      Marketing and sales..............................      1,447       3,257       4,201       1,946       2,924
      General and administrative.......................      1,450       2,583       6,805       2,874       5,412
                                                         ---------  ----------  ----------  ----------  ----------
        Total costs and expenses.......................      9,999      16,724      38,515      13,486      24,828
                                                         ---------  ----------  ----------  ----------  ----------
  Loss from operations.................................     (8,242)    (15,073)    (36,389)    (12,195)    (24,408)
  Other income (expense)...............................       (148)        441      (4,564)         75      (7,903)
                                                         ---------  ----------  ----------  ----------  ----------
  Loss before income taxes.............................     (8,390)    (14,632)    (40,953)    (12,120)    (32,311)
  Provision for income taxes...........................          1           2           3           1           2
                                                         ---------  ----------  ----------  ----------  ----------
  Net loss.............................................  $  (8,391) $  (14,634) $  (40,956) $  (12,121) $  (32,313)
                                                         ---------  ----------  ----------  ----------  ----------
                                                         ---------  ----------  ----------  ----------  ----------
  Pro forma net loss per share (1).....................                         $    (1.22)             $    (0.94)
                                                                                ----------              ----------
                                                                                ----------              ----------
  Shares used in computing pro forma net loss per share
   (1).................................................                             33,497                  34,483
                                                                                ----------              ----------
                                                                                ----------              ----------
</TABLE>
    
 
<TABLE>
<CAPTION>
                                                                                  DECEMBER 31, 1995  JUNE 30, 1996
                                                                                  -----------------  -------------
<S>                                                                               <C>                <C>
SELECTED OTHER DATA:
  Meters under contract (2).....................................................        1,070,000       1,220,000
  Meters in revenue service (2).................................................           17,559         105,354
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                                      JUNE 30, 1996
                                                                       -------------------------------------------
                                                                                                         AS
                                                                         ACTUAL    PRO FORMA(3)    ADJUSTED(3)(4)
                                                                       ----------  -------------  ----------------
                                                                                     (IN THOUSANDS)
<S>                                                                    <C>         <C>            <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash, cash equivalents and short-term investments..................  $  102,967   $   106,621      $  224,131
  Total assets.......................................................     162,653       166,307         283,817
  Long-term obligations..............................................     195,513       195,513         195,513
  Series CC redeemable convertible preferred stock...................      29,486       --               --
  Total stockholders' equity (deficit)...............................     (70,400)      (37,260)         80,250
</TABLE>
    
 
- ---------
(1) For  an explanation  of the  determination of the  number of  shares used in
    computing pro forma net loss per share, see Note 1 to Consolidated Financial
    Statements.
 
   
(2) "Meters under contract" refers to the  aggregate number of meters for  which
    the  Company has  agreed to provide  NMR services  under services agreements
    with utilities  and "Meters  in  revenue service"  refers to  the  aggregate
    number  of meters under contract which  have been installed on the Company's
    networks and for which the Company is receiving NMR service revenues. As  of
    August  31, 1996, the Company had 2,235,000  meters under contract and as of
    July 31, 1996, the Company had 143,373 meters in revenue service.
    
 
   
(3) Reflects the conversion of  all outstanding shares  of Preferred Stock  into
    Common  Stock and the  exercise of warrants to  purchase 4,132,970 shares of
    Common Stock at an  aggregate exercise price  of approximately $3.7  million
    upon the closing of this Offering.
    
 
   
(4) Adjusted  to reflect  the proceeds  of this  Offering at  an assumed initial
    public offering  price of  $20.00 per  share and  after deducting  estimated
    underwriting  discounts and commissions and offering expenses payable by the
    Company. See "Use of Proceeds." Also  reflects the sale of 1,470,833  shares
    of  Common Stock  pursuant to  the Utility  Stock Purchases,  less estimated
    issuance costs of $40,000 with respect to such purchases. See "Utility Stock
    Purchases."
    
 
                                       7
<PAGE>
                                  RISK FACTORS
 
    AN  INVESTMENT  IN THE  COMMON STOCK  BEING OFFERED  HEREBY INVOLVES  A HIGH
DEGREE OF RISK.  PROSPECTIVE INVESTORS SHOULD  CAREFULLY CONSIDER THE  FOLLOWING
RISK FACTORS, IN ADDITION TO THE OTHER INFORMATION CONTAINED IN THIS PROSPECTUS,
BEFORE PURCHASING THE COMMON STOCK OFFERED HEREBY. CERTAIN INFORMATION CONTAINED
IN  THIS SECTION  AND ELSEWHERE IN  THIS PROSPECTUS,  INCLUDING INFORMATION WITH
REGARD TO THE COMPANY'S EXPECTED WIRELESS COMMUNICATIONS NETWORK DEPLOYMENTS AND
OPERATIONS, ITS STRATEGY FOR MARKETING  AND DEPLOYING SUCH NETWORKS AND  RELATED
FINANCING  ACTIVITIES CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND
UNCERTAINTIES. THE  COMPANY'S  ACTUAL RESULTS  MAY  DIFFER MATERIALLY  FROM  THE
RESULTS  DISCUSSED IN THE  FORWARD-LOOKING STATEMENTS. FACTORS  THAT MIGHT CAUSE
SUCH A DIFFERENCE  INCLUDE, BUT  ARE NOT LIMITED  TO, THOSE  DISCUSSED IN  "RISK
FACTORS,"  "MANAGEMENT'S  DISCUSSION  AND ANALYSIS  OF  FINANCIAL  CONDITION AND
RESULTS OF OPERATIONS" AND "BUSINESS."
 
HISTORY AND CONTINUATION OF OPERATING LOSSES
 
    The Company has incurred substantial  and increasing operating losses  since
inception. As of June 30, 1996, the Company had an accumulated deficit of $127.3
million,  primarily resulting from  expenses incurred in  the development of the
Company's wireless data communications system,  marketing of the Company's  NMR,
distribution  automation and  other services,  the installation  of its wireless
data communications networks and the payment of other normal operating costs.
 
   
    The Company does not expect significant revenues during 1996 and expects  to
incur  substantial and  increasing operating losses  and negative  net cash flow
after capital expenditures for the foreseeable future as it expands its research
and development  and marketing  efforts and  installs additional  networks.  The
Company's network service revenues from a particular network are expected to lag
significantly  behind  network  installation  expenses  until  such  network  is
substantially complete. If the  Company is able  to deploy additional  networks,
the  losses created by this  lag in revenues are  expected to increase until the
revenues from  the installed  networks overtake  the costs  associated with  the
deployment  and  operation of  such additional  networks.  The Company  does not
expect positive  cash flow  after  capital expenditures  from its  NMR  services
operations  for several years. A large portion of the Company's limited revenues
to date has been attributable  to miscellaneous equipment sales and  development
and  other contract revenues that are largely non-recurring and that the Company
expects to decrease and remain at relatively insignificant levels over the  next
few  years. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations."
    
 
DEPENDENCE ON AND UNCERTAINTY OF UTILITY MARKET ACCEPTANCE
 
   
    The Company's success will be almost  entirely dependent on whether a  large
number  of utility companies sign long-term services contracts with CellNet. Any
decision by  a  utility  to  utilize  the  Company's  services  will  involve  a
significant  organizational,  technological  and  financial  commitment  by such
utility. The  utility industry  is generally  characterized by  long  purchasing
cycles  and cautious  decision making.  Utilities typically  go through numerous
steps before making a final purchase decision. These steps, which can take up to
several years to complete, may include the formation of a committee to  evaluate
the   purchase,  the  review  of   different  technical  options  with  vendors,
performance and  cost justifications,  regulatory review  and the  creation  and
issuance  of requests for quotes and proposals, as well as the utilities' normal
budget  approval  process.  Purchases  of  the  Company's  services  are,  to  a
substantial  extent,  deferrable  in the  event  that utilities  seek  to reduce
capital expenditures. Outside of  pilot trials, only  four utilities (KCPL,  UE,
and  recently NSP and  Puget) have made  a commitment to  purchase the Company's
services to date, and  there can be no  assurance as to when  or if the  Company
will  enter into additional services contracts  or that any such agreement would
be on favorable terms to the Company. See "Business."
    
 
    Because automation of utility meter reading and distribution is a relatively
new and evolving market, it is difficult  to predict the future growth rate  and
size  of  this  market.  Utility companies  are  testing  products  from various
suppliers for various applications,  and no industry  standard has been  broadly
adopted. The CellNet system is one possible solution for automated meter reading
and  distribution automation. There can be no assurance that the Company will be
successful in achieving  the large-scale adoption  of its system.  In the  event
that  the utility industry does  not adopt the Company's  technology, or does so
less rapidly  than  expected  by  the Company,  the  Company's  future  results,
including its ability to service its indebtedness and
 
                                       8
<PAGE>
achieve  profitability,  will be  materially and  adversely affected.  In recent
competitive bids, potential utility  customers have from  time to time  selected
competing  systems to perform services offered  by the Company. See "Business --
Competition."
 
UNCERTAINTY OF FUTURE REVENUES; INCREASING INSTALLATION COSTS; NEED FOR
ADDITIONAL SERVICES CONTRACTS AND FLUCTUATING OPERATING RESULTS
 
   
    The timing and amount  of future revenues will  depend almost entirely  upon
the Company's ability to obtain new services agreements with utilities and other
parties  and  upon  the successful  deployment  and operation  of  the Company's
wireless data communications networks. The signing of any new services contracts
is expected to occur on an irregular basis, if at all. The Company expects  that
it  will generally take two  to four years to  complete the installation of each
network after a services  contract has been signed.  Service revenues from  such
networks  are  not  expected to  exceed  the Company's  capital  investments and
expenses incurred to  deploy and  operate such  network for  several years.  The
Company  will not begin to receive  recurring revenues under a services contract
until portions of the network become operational, which is expected to occur  no
earlier  than six  months after  installation begins.  The Company's  results of
operations may be adversely  affected by delays or  difficulties arising in  the
network  installation process.  The cost of  network deployments  will be highly
variable and depend upon  a wide variety of  factors, including radio  frequency
characteristics, the size of a service territory and density of endpoints within
such  territory, the nature and sophistication of services being provided, local
labor rates and other economic factors.
    
 
   
    CellNet currently derives almost all of its revenues from long-term services
contracts with KCPL and UE. The Company recently entered into services contracts
with NSP  and Puget.  The Company  will  not generate  sufficient cash  flow  to
service  its  indebtedness  or achieve  profitability  unless it  enters  into a
significant number of additional services  contracts. There can be no  assurance
that  the Company  will complete  commercial deployments  of the  CellNet system
under the KCPL, UE, NSP and Puget contracts successfully or that it will  obtain
enough  additional contracts on satisfactory terms  for network deployments in a
sufficient number of  locations to allow  the Company to  achieve adequate  cash
flow  to  service  its  indebtedness  or  achieve  profitability.  The Company's
operating results will fluctuate  significantly in the future  as a result of  a
variety  of  factors,  some  of  which are  outside  of  the  Company's control,
including the  rate  at which  utilities  and  other customers  enter  into  new
services  contracts,  general economic  conditions,  economic conditions  in the
utility  industry,  the  effects  of  governmental  regulations  and  regulatory
changes,  capital  expenditures and  other costs  relating  to the  expansion of
operations, the introduction of new services by the Company or its  competitors,
the  mix of services sold, pricing changes  and new service introductions by the
Company and its competitors  and prices charged by  suppliers. In response to  a
changing  competitive environment,  the Company may  elect from time  to time to
make certain pricing,  service or  marketing decisions or  enter into  strategic
alliances  or  investments that  could  have a  material  adverse effect  on the
Company's business, results  of operations, financial  condition and cash  flow.
See  "Management's Discussion and Analysis of Financial Condition and Results of
Operations."
    
 
UNCERTAINTY OF ACCEPTANCE OF AND DEPENDENCE ON OTHER APPLICATIONS
 
   
    The Company's  long-term  business plan  contemplates  offering  non-utility
application  services. The  Company believes its  future ability  to service its
indebtedness and to achieve profitability will be significantly dependent on its
success in generating  substantial revenues from  such additional services.  The
Company currently has no services contracts which provide for the implementation
of  such services, and the Company has not yet demonstrated an ability to deploy
such services on a commercial scale. In addition, unless utilities sign services
contracts that  enable the  Company to  deploy its  wireless networks  in  their
service  areas, the Company may  not be able to offer  any such services in such
areas or  may be  able to  offer these  services only  on a  limited basis.  See
"Business   --  Business   Strategy  --   Promote  Development   of  Non-Utility
Applications" and "Business -- Wireless Communications Industry Overview."
    
   
SUBSTANTIAL LEVERAGE AND ABILITY TO SERVICE DEBT; SUBSTANTIAL FUTURE CAPITAL
NEEDS
    
   
    The  Company  had  outstanding   indebtedness  as  of   June  30,  1996   of
approximately $195.5 million, which included $194.7 million of the Company's 13%
Senior  Discount  Notes  due  2005 (the  "Senior  Discount  Notes").  The Senior
Discount Notes will  accrete to $325.0  million by June  2000. The Company  must
begin
    
 
                                       9
<PAGE>
   
paying  cash interest on the Senior Discount Notes in December 2000. The Company
and its  subsidiaries  intend  to  incur  substantial  additional  indebtedness,
primarily  in  connection  with installing  future  networks. As  a  result, the
Company and its subsidiaries will have substantial debt service obligations. The
Company's capital  expenditures  will  increase significantly  if  new  services
contracts  are signed, and  the Company expects  that its cash  flow taking into
account capital expenditures will be increasingly negative over the next several
years. The ability  of the Company  to meet its  debt service requirements  will
depend  upon achieving  significant and sustained  growth in  the Company's cash
flow, which  will  be affected  by  its  success in  implementing  its  business
strategy,  prevailing  economic  conditions and  financial,  business  and other
factors, certain  of  which are  beyond  the Company's  control.  The  Company's
ability  to  generate  such  cash flow  is  subject  to a  number  of  risks and
contingencies. Included among these  risks are: (i)  the possibilities that  the
Company  may not  obtain sufficient  additional services  agreements or complete
scheduled installations on a  timely basis, (ii) revenues  may not be  generated
quickly   enough  to  meet  the  Company's  operating  costs  and  debt  service
obligations, (iii) the Company's  wireless systems could experience  performance
problems  or (iv) adoption of the Company's system could be less widespread than
anticipated. Accordingly, there can  be no assurance as  to whether or when  the
Company's  operations will generate  positive cash flow  or become profitable or
whether the  Company  or its  subsidiaries  will  at any  time  have  sufficient
resources  to meet their debt  service obligations. If the  Company is unable to
generate sufficient  cash flow  to service  its indebtedness,  it will  have  to
reduce  or  delay  planned  capital expenditures,  sell  assets,  restructure or
refinance its indebtedness or  seek additional equity capital.  There can be  no
assurance  that any of these strategies could be effected on satisfactory terms,
if at all, particularly in light  of the Company's high levels of  indebtedness.
In addition, the degree to which the Company is leveraged could have significant
consequences,  including, but not  limited to, the  following: (i) the Company's
ability to  obtain  additional financing  in  the future  for  working  capital,
capital  expenditures, research and development, acquisitions, and other general
corporate purposes may  be materially  limited or impaired,  (ii) a  substantial
portion  of the  Company's cash  flow from operations  must be  dedicated to the
payment of principal and  interest on its indebtedness  and therefore cannot  be
used  in the Company's business and (iii)  the Company's high degree of leverage
may make it  more vulnerable  to economic downturns,  may limit  its ability  to
withstand  competitive pressures and may reduce its flexibility in responding to
changing business and economic conditions.
    
   
    The Company will require substantial  additional funds for the  development,
commercial  deployment  and  expansion  of  its networks,  as  well  as  to fund
operating losses. As of June 30, 1996,  the Company had $103.0 million in  cash,
cash  equivalents and short-term investments. The  Company believes that the net
proceeds of this  Offering and from  the sale  of Common Stock  pursuant to  the
Utility  Stock Purchases, together with its  existing cash, cash equivalents and
short-term investments and anticipated interest income and other revenues,  will
be  sufficient to meet  its cash requirements  for at least  the next 12 months.
Thereafter, the  Company expects  that it  will require  substantial  additional
capital. Depending upon the number and timing of any new services agreements and
upon  the associated  network deployment  costs and  schedules, the  Company may
require additional equity or debt financing  earlier than estimated in order  to
fund  its  working  capital and  other  requirements. Future  financings  may be
dilutive to existing  stockholders. There  can be no  assurance that  additional
financing  will be available when required or,  if available, that it will be on
terms satisfactory to the Company. See "Management's Discussion and Analysis  of
Financial   Condition  and  Results  of  Operations  --  Liquidity  and  Capital
Resources."
    
    Substantially all of the operations of the Company are and will be conducted
through  subsidiaries.  Nonetheless,  the   Company  has  incurred   significant
indebtedness  at the  holding company  level, and  intends to  incur substantial
additional holding company indebtedness. The  ability of the Company to  service
such  indebtedness will depend on the availability  of income and cash flow from
its subsidiaries for distribution to the holding company. Such availability will
depend on  a number  of factors,  including the  terms of  financing  agreements
entered  into by the  Company's subsidiaries and  restrictions arising under the
laws of the jurisdictions wherein  those subsidiaries conduct their  businesses.
The  Company's subsidiaries are separate and distinct legal entities and have no
obligation, contingent or  otherwise, to pay  any amounts due  on the  Company's
indebtedness  or to make  any funds available  therefor, whether in  the form of
loans,  dividends  or  otherwise.  Any  default  in  the  payment  of  its  debt
obligations could seriously impair the value of the Common Stock.
 
                                       10
<PAGE>
    In the event that the Company is unable to generate sufficient cash flow and
is  otherwise unable to obtain funds necessary  to meet required payments on its
indebtedness, the Company could be in default under the terms of the  agreements
governing  such indebtedness. In the event of  such default, the holders of such
indebtedness would  have  certain enforcement  rights,  including the  right  to
accelerate  such  debt  and  the right  to  commence  an  involuntary bankruptcy
proceeding against  the Company.  In any  such proceeding,  the holders  of  the
Company's debt would be entitled to receive payment of their claims prior to any
distributions   to  equity  holders.   In  addition,  any   holders  of  secured
indebtedness of the Company  and its subsidiaries would  have certain rights  to
repossess,  foreclose upon and  sell the assets  securing such indebtedness. See
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations."
SUBSTANTIAL AND INCREASING COMPETITION
    The  emerging market for  utility NMR systems, and  the potential market for
other  applications  once  a  common  infrastructure  is  in  place,  have   led
electronics,  communications and  utility product companies  to begin developing
various systems, some of which currently compete, and others of which may in the
future compete, with  the CellNet  system. The  Company believes  that its  only
significant  direct  competitor in  the marketplace  at  present is  Itron, Inc.
("Itron"), an  established manufacturer  and seller  of hand-held  and  drive-by
automated  meter  reading  equipment  to  utilities.  Itron  has  announced  the
development of its  Genesis-TM- system, a  radio network system  similar to  the
Company's,  for meter reading purposes and  is presently offering that system in
the marketplace.  The  Company believes  that  Itron  has signed  at  least  two
contracts  with  utilities for  the commercial  installation of  its Genesis-TM-
system.
   
    There may  be many  potential  alternative solutions  to the  Company's  NMR
services  including traditional  wireless solutions. Metricom,  Inc., a provider
primarily  of  subscriber-based,  wireless  data  communications  for  users  of
portable  and desktop computers; First Pacific Networks, a provider primarily of
bandwidth efficient wireline communications technology; and Lucent  Technologies
are  examples of companies whose technology might be adapted for NMR and who may
become direct  competitors  of  the  Company  in  the  future.  Schlumberger  is
developing a fixed network system in cooperation with Motorola for meter reading
as  well. Schlumberger,  Lucent Technologies  and First  Pacific Networks either
have conducted, or  are in the  process of conducting,  pilot trials of  utility
network  automation systems.  Established suppliers  of equipment,  services and
technology to  the  utility industry  such  as  Asea Brown  Boveri  and  General
Electric  could  expand their  current product  and service  offerings so  as to
compete directly with the Company, although they  have not yet done so. Many  of
the  Company's  present  and  potential  future  competitors  have substantially
greater  financial,  marketing,  technical  and  manufacturing  resources,  name
recognition  and experience than  the Company. The  Company's competitors may be
able to respond  more quickly  to new or  emerging technologies  and changes  in
customer  requirements  or  to  devote  greater  resources  to  the development,
promotion and  sale of  their  products and  services  than the  Company.  While
CellNet believes its technology is widely regarded as competitive at the present
time,  there can be no assurance that the Company's competitors will not succeed
in developing products or technologies that  are better or more cost  effective.
In  addition, current and potential  competitors may make strategic acquisitions
or establish cooperative  relationships among themselves  or with third  parties
that  increase their ability  to address the needs  of the Company's prospective
customers. Accordingly, it is possible  that new competitors or alliances  among
current  and  new competitors  may emerge  and  rapidly gain  significant market
share. In addition, if  the Company achieves significant  success it could  draw
additional  competitors  into  the  market.  Traditional  providers  of wireless
services may in the future choose to enter the Company's markets. Such  existing
and  future competition  could materially adversely  affect the  pricing for the
Company's services and  the Company's  ability to sign  long-term contracts  and
maintain  existing agreements with utilities.  Competition for services relating
to non-utility applications may be more intense than competition for utility NMR
services. There can be  no assurance that  the Company will  be able to  compete
successfully  against current and  future competitors, and any  failure to do so
would have  a  material adverse  effect  on the  Company's  business,  operating
results, financial condition and cash flow. See "Business -- Competition."
    
 
                                       11
<PAGE>
   
TECHNOLOGICAL PERFORMANCE AND BUILD-OUT OF THE SYSTEM; RAPID TECHNOLOGICAL
CHANGE AND UNCERTAINTY
    
   
    The   Company's  initial  target  market  is  the  monitoring,  control  and
automation of utility companies' electric, gas and water distribution  networks.
Although  the  CellNet  system  (including both  NMR  services  and distribution
automation) has  been deployed  commercially with  more than  105,000 meters  in
revenue  service as of June 30, 1996,  there can be no assurance that unforeseen
problems will not develop with respect to the Company's technology, products  or
services,  or that the Company will  be successful in completing the development
and commercial implementation of  its technology on a  wider scale. The  Company
must  complete a number of technical development projects and continue to expand
and upgrade its capabilities in connection with such commercial  implementation,
the  success of which cannot be assured.  While the Company believes that it has
developed the necessary hardware to install its endpoint devices on most of  the
standard electromechanical electric meters manufactured by the four largest U.S.
electric meter manufacturers, there can be no assurance that the Company will be
able  to  develop successfully  a  full range  of  endpoint devices  required by
utilities. The Company must also develop the hardware enhancements necessary  to
utilize  its  system  on a  commercial  basis  with gas  and  water  meters. The
Company's future success  will be  materially adversely  affected if  it is  not
successful  or  is  significantly  delayed in  the  completion  of  its hardware
development programs.
    
    The Company's future success  will also depend, in  part, on its ability  to
enhance  its existing hardware, software and wireless communications technology.
The telecommunications  industry has  been characterized  by rapid,  significant
technological advances. The advent of computer-linked electronic networks, fiber
optic   transmission,  advanced  data   digitization  technology,  cellular  and
satellite  communications  capabilities  and  personal  communications   systems
("PCS")   have  radically   expanded  communications   capabilities  and  market
opportunities. Future advances may render  the Company's technology obsolete  or
less  cost  effective than  competitive systems  or  erode the  Company's market
position. Many companies from diverse  industries are seeking solutions for  the
transmission  of data over traditional communications media, including radio, as
well as more recently developed media  such as cellular and PCS-based  networks.
Competitors  may  be  capable  of offering  significant  cost  savings  or other
benefits to the  Company's customers,  and there can  be no  assurance that  the
Company   will  maintain   competitive  services   or  obtain   appropriate  new
technologies on  a timely  basis  or on  satisfactory  terms. See  "Business  --
Wireless Communications Industry Overview."
    The  necessary development effort will require the Company to make continued
substantial investments. The Company has encountered product development  delays
in  the past affecting both software and  hardware components of its system. See
"Business -- Research and Development."
   
ACCESS TO RADIO FREQUENCY ("RF") SPECTRUM; REGULATION BY THE FEDERAL
COMMUNICATIONS COMMISSION ("FCC")
    
    The Company will  attempt to  obtain exclusive usage  of licensed  bandwidth
and/or secure its own licenses. CellNet is engaged in a program to license radio
spectrum  for its wireless networks in the top 60 MSAs in the U.S. sufficient to
support its projected  utility and  non-utility applications with  a margin  for
future  growth. Enough frequency  spectrum may not be  available to fully enable
the delivery of  all or  a part of  the Company's  wireless data  communications
services  or the  Company may be  required to find  alternative frequencies. The
cost of  obtaining such  spectrum is  currently difficult  to estimate  and  may
involve time delays and/or increased cost to the Company. The Company could also
be unable to obtain frequency in certain areas. Any of these circumstances could
have  a material adverse impact  on the Company's future  ability to provide its
network services and  on the  Company's business,  operating results,  financial
condition and cash flow. See "Business -- Regulation."
    The Company's network equipment uses radio spectrum and, as such, is subject
to  regulation by the FCC. In addition, CellNet intends to provide services as a
private carrier.  This  status  allows  services  to  be  provided  pursuant  to
individual   contracts  without  becoming  subject  to  many  of  the  statutory
requirements and FCC and state regulations  that govern the provision of  common
carrier services. The Company's network equipment uses both licensed RF spectrum
allocated for multiple address system ("MAS") operations in the 928/952 MHz band
and unlicensed spectrum in the 902-928 MHz band. In order to obtain a license to
operate  the  Company's  network  equipment in  the  928/952  MHz  band, license
applicants may need
 
                                       12
<PAGE>
to obtain a waiver of various sections of the FCC's rules. Although the  Company
has  obtained such waivers for  its licensed systems routinely  in the past, and
expects the required waivers  to be granted  on a routine  basis in the  future,
there  can be no assurance that the Company  will be able to obtain such waivers
on a timely  basis or  to obtain  them at  all. In  addition, as  the amount  of
spectrum  in the  928/952 MHz  band is  limited, issuance  of these  licenses is
contingent upon  the availability  of  spectrum in  the  area(s) for  which  the
licenses  are requested. The Company might not be able to obtain licenses to the
spectrum it needs in every area in which it has prospective customers. The FCC's
rules, subject to a number of  limited exceptions, permit third parties such  as
CellNet  to operate on spectrum licensed to utilities to provide other services.
The Company plans  to use  these provisions  of the  FCC's rules  to expand  its
CellNet system.
    The  FCC  requires that  a  minimum configuration  of  an MAS  system  be in
operation within  eighteen months  from the  initial date  of the  grant of  the
system  authorization or risk forfeiture of the license for the MAS frequencies.
The eighteen-month deadline  may be  extended upon  showing of  good cause,  but
there is no assurance that the FCC will grant any such extension. The Company is
responding to this requirement by selectively building out transmission capacity
in  some areas  where it does  not yet have  utility telecommunications services
contracts and may permit licenses to lapse in certain areas.
    No license  is  needed to  operate  the Company's  equipment  utilizing  the
902-928  MHz band, although the  equipment must be certified  by the Company and
the FCC as  being compliant  with certain  FCC restrictions  on radio  frequency
emissions designed to protect licensed services from objectionable interference.
While  the Company believes it has  obtained all required certifications for its
products, the FCC could modify the limits imposed on such products or  otherwise
impose  new authorization requirements,  and in either  case, such changes could
have a  material adverse  impact on  the Company's  business. The  FCC  recently
completed  a  new  rulemaking  proceeding  designed  to  better  accommodate the
cohabitation in the 902-928  MHz band of existing  licensed services with  newly
authorized  and  expanded  uses  of licensed  systems,  and  existing  and newly
designed unlicensed devices like those used by the Company. In this  proceeding,
the  FCC expressly recognized the rights  of such unlicensed services to operate
under  certain  delineated  operating  parameters  even  if  the  potential  for
interference  to  the licensed  operations  exists. The  Company's  systems will
operate within those specified parameters. The  FCC retains the right to  modify
those  rules  or to  allow for  other uses  of this  spectrum that  might create
interference to  the Company's  systems, which  could, in  either case,  have  a
material  adverse impact on the Company's business, operating results, financial
condition and cash flow.
   
    While the Company intends to offer non-utility services as a private carrier
and in accordance with FCC  Rules, each such service  offering would need to  be
reviewed  relative to these rules. The FCC's rules currently prohibit the use of
the MAS  frequencies on  which the  Company  is operating  its systems  for  the
provision  of  common  carrier  service  offerings.  In  the  event  that  it is
determined that a particular  service offering does not  comply with the  rules,
the  Company may be  required to restructure  such offering or  to utilize other
frequencies for the purpose of providing such service. There can be no assurance
that  the  Company  will   gain  access  to   such  other  frequencies.   Future
interpretation  of regulations by  the FCC or  changes in the  regulation of the
Company's industry  by the  FCC or  other regulatory  bodies or  legislation  by
Congress  could  have  a  material adverse  effect  on  the  Company's business,
operating  results,  financial  condition  and  cash  flow.  See  "Business   --
Regulation."
    
   
MANAGEMENT OF GROWTH; DEPENDENCE ON KEY PERSONNEL
    
    The  Company's  recent growth  has placed,  and is  expected to  continue to
place, a  significant  strain  on  its  managerial,  operational  and  financial
resources. The Company's ability to manage growth effectively will require it to
continue  to implement and improve its  operational and financial systems and to
expand, train  and manage  its  employee base.  These  demands are  expected  to
require  the  addition  of  new  management  personnel  and  the  development of
additional expertise by existing management personnel. There can be no assurance
that the  Company  will be  able  to effectively  manage  the expansion  of  its
operations, that its systems, procedures or controls will be adequate to support
the Company's operations or that Company
 
                                       13
<PAGE>
management  will be able to exploit opportunities for the Company's services. An
inability to manage growth, if any, could have a material adverse effect on  the
Company's  business, results of  operations, financial condition  and cash flow.
See "Management."
    The success of the Company is substantially dependent on its key  management
and  technical personnel, the loss of one or more of whom could adversely affect
the Company's business. All of the Company's employees and officers are employed
on an at-will basis. Presently, the Company  does not maintain a "key man"  life
insurance  policy on  any of its  executives or employees.  The Company's future
success also depends  on its  continuing ability  to identify,  hire, train  and
retain  other highly  qualified technical and  managerial personnel. Competition
for such personnel is intense,  and there can be  no assurance that the  Company
will  be able  to attract  or retain  highly qualified  technical and managerial
personnel in  the future.  An  inability to  attract  and retain  the  necessary
technical  and managerial personnel could have  a material adverse effect on the
Company's business, operating  results, financial condition  and cash flow.  See
"Business -- Employees" and "Management."
UNCERTAINTY OF PROTECTION OF COPYRIGHTS, PATENTS AND PROPRIETARY RIGHTS
   
    The  Company relies on a combination  of trade secret protection, copyright,
patent, trademark and confidentiality  agreements and licensing arrangements  to
establish  and protect its proprietary rights. The Company's success will depend
in part  on its  ability to  maintain copyright  and patent  protection for  its
products,  to preserve its  trade secrets and to  operate without infringing the
proprietary rights of third parties. While the Company has obtained and  applied
for  patents,  and  intends  to file  applications  as  appropriate  for patents
covering its products and processes, there  can be no assurance that  additional
patents  will be issued or,  if issued, that the  scope of any patent protection
will be significant, or that  any patents issued to  the Company or licensed  by
the  Company will  not be challenged,  invalidated or circumvented,  or that the
rights granted thereunder  will provide proprietary  protection to the  Company.
Since  U.S.  patent applications  are maintained  in  secrecy until  patents are
issued,  and  since  publication  of  inventions  in  the  technical  or  patent
literature  tend to lag behind such inventions by several months, CellNet cannot
be certain that it  was the first  creator of inventions  covered by its  issued
patents  or pending patent  applications, that it  was the first  to file patent
applications for such  inventions or  that no  patent conflict  will exist  with
other  products or processes which could  compete with the Company's products or
approach.  Despite  the  Company's  efforts  to  safeguard  and  maintain  these
proprietary  rights,  there  can  be  no  assurance  that  the  Company  will be
successful or that the Company's competitors will not independently develop  and
patent  technologies  that  are  substantially  equivalent  or  superior  to the
Company's  technologies.  Participants  in  the  wireless  industry,   including
competitors  of the Company, typically seek to obtain patents which will provide
as broad a  protection possible  for their products  and processes.  There is  a
substantial  backlog  of  patents at  the  United  States Patent  Office.  It is
uncertain whether any such third-party patents will require the Company to alter
its products  or processes,  obtain  licenses or  cease certain  activities.  An
adverse  outcome with  regard to a  third-party patent  infringement claim could
subject the Company to  significant liabilities, require  disputed rights to  be
licensed  or restrict the Company's ability  to use such technology. The Company
also relies  to a  substantial  degree upon  unpatented  trade secrets,  and  no
assurance  can be given  that others, including  the Company's competitors, will
not independently develop  or otherwise acquire  substantially equivalent  trade
secrets.  In  addition, whether  or  not additional  patents  are issued  to the
Company, others may receive patents which contain claims applicable to  products
or processes developed by the Company. If any such claims were to be upheld, the
Company  would require  licenses, and  no assurance  can be  given that licenses
would be available  on acceptable  terms, if at  all. In  addition, the  Company
could  incur substantial costs in defending  against suits brought against it by
others for infringement of intellectual property rights or in prosecuting  suits
which  the Company might bring against other parties to protect its intellectual
property rights. From time to time  the Company receives inquiries with  respect
to  the  coverage of  its  intellectual property  rights,  and there  can  be no
assurance that such inquiries will not develop into litigation. See "Business --
Proprietary Rights."
    
    Although the Company has been granted federal registration of its  "CellNet"
trademark,  another Company has filed a  petition for cancellation in an attempt
to challenge  such registration  which, if  successful, would  mean the  Company
could  lose  its registration  and  be required  to  adopt a  new  trademark and
 
                                       14
<PAGE>
possibly a  new or  modified  corporate name.  CellNet could  encounter  similar
challenges  to  its  trademark  and  corporate name  in  the  future.  While the
requirement to adopt  a new trademark  or new or  modified corporate name  could
involve  a significant expense and could result  in the loss of any goodwill and
name recognition associated with the  Company's current trademark and  corporate
name,  the Company does not believe this would have a long-term material adverse
impact on its business,  operating results, financial  condition and cash  flow.
See "Business -- Litigation."
DEPENDENCE ON THIRD-PARTY MANUFACTURERS; EXPOSURE TO COMPONENT SHORTAGES
    The  Company  relies  and  will  continue  to  rely  on  outside  parties to
manufacture a  majority of  its  network equipment  such  as radio  devices  and
printed  circuit  boards. As  the Company  signs additional  services contracts,
there will be  a significant  ramp-up in the  amount of  manufacturing by  third
parties  in order to enable the Company to meet its contractual commitments. The
Company currently  relies on  single  manufacturers for  radio devices  and  for
printed  circuit boards. There can be no assurance that these manufacturers will
be able to meet the Company's  manufacturing needs in a satisfactory and  timely
manner  or  that the  Company can  obtain additional  manufacturers when  and if
needed. Although the Company  believes alternative manufacturers are  available,
an  inability of the  Company to develop alternative  suppliers quickly or cost-
effectively could  materially  impair its  ability  to manufacture  and  install
systems.  The Company's reliance on  third-party manufacturers involves a number
of additional risks, including  the absence of  guaranteed capacity and  reduced
control over delivery schedules, quality assurance, production yields and costs.
Although  the Company believes  that these manufacturers  would have an economic
incentive to perform such manufacturing for the Company, the quality, amount and
timing of resources to be devoted to these activities is not within the  control
of  the Company, and there can be  no assurance that manufacturing problems will
not occur  in  the future.  A  significant  price increase,  a  quality  control
problem, an interruption in supply from one or more of such manufacturers or the
inability  to obtain  additional manufacturers when  and if needed  could have a
material adverse effect on the Company's business, operating results,  financial
condition and cash flow. See "Business -- Manufacturing and Operations."
    Certain of the Company's subassemblies, components and network equipment are
procured  from single sources and others are procured only from a limited number
of sources. In addition, CellNet may be affected by general shortages of certain
components, such as surface mounted integrated circuits and memory chips.  There
have  been shortages of such materials generally in the marketplace from time to
time in the past.  The Company's reliance  on such components  and on a  limited
number  of  vendors and  subcontractors  involves certain  risks,  including the
possibility  of  shortages   and  reduced  control   over  delivery   schedules,
manufacturing  capability,  quality and  cost. A  significant price  increase or
interruption in supply from one or more of such suppliers could have a  material
adverse effect on the Company's business, operating results, financial condition
and   cash  flow.  Although  the   Company  believes  alternative  suppliers  of
sub-assemblies, components and network equipment are available, the inability of
the Company to  develop alternative  sources quickly  or cost-effectively  could
materially impair its ability to manufacture and install systems. Lead times can
be  as long as a  year for certain components, which  may require the Company to
use working capital to purchase inventory significantly in advance of  receiving
any revenues. See "Business -- Manufacturing and Operations."
DEPENDENCE ON BUSINESS ALLIANCES
    A  key  element  of the  Company's  business  strategy is  the  formation of
corporate alliances with leading companies. The Company is currently  investing,
and  plans  to  continue  to  invest,  significant  resources  to  develop these
relationships. The Company believes that its success in penetrating markets  for
non-utility applications of its network will depend in large part on its ability
to  maintain  these relationships  and  to cultivate  additional  or alternative
relationships. There  can be  no assurance  that  the Company  will be  able  to
develop  additional  corporate  alliances  with  such  companies,  that existing
relationships will continue or be successful in achieving their purposes or that
such companies will not form  competing arrangements. See "Business --  Business
Strategy -- Form Strategic Alliances."
 
                                       15
<PAGE>
POSSIBLE TERMINATION OF LONG-TERM CONTRACTS
   
    The  Company expects that  substantially all of its  future revenues will be
provided pursuant to  long-term services  contracts with  utility companies  and
other  parties. These  contracts will  generally be  subject to  cancellation or
termination in certain circumstances in the  event of a material and  continuing
failure  on  CellNet's  part  to  meet agreed  NMR  performance  standards  on a
consistent basis over agreed time periods, subject to certain rights to cure any
such failure. Each of  the Company's existing  services contracts also  provides
for  termination of  such contracts by  the respective utility  without cause in
less than ten years, subject to certain reimbursement provisions. Such contracts
also provide that CellNet will be required to compensate such utilities for  the
use  of its system  for non-utility applications.  In the event  that a services
contract is terminated by a utility, the Company would incur substantial losses.
A network's service revenues  are not expected to  exceed the Company's  capital
investments   to  deploy  such   network  for  several   years.  Termination  or
cancellation of one  or more utility  services contracts would  have a  material
adverse  effect  on the  Company's  business, results  of  operations, financial
condition and cash flow. See "Business -- Current Utility Services Agreements."
    
RISKS ASSOCIATED WITH INTERNATIONAL EXPANSION
   
    The Company plans to expand into international markets and has begun initial
marketing efforts.  The  Company does  not  anticipate  that it  will  have  any
material  international operations in the next  12 months. If revenues generated
by  international  activities  are  not  adequate  to  offset  the  expense   of
establishing and maintaining these activities, the Company's business, operating
results,  financial  condition  and  cash  flow  could  be  materially adversely
affected. International  demand  for  the  Company's  services  and  systems  is
expected   to  vary  by  country,  based  on  such  factors  as  the  regulatory
environment, electric  power generating  capacity and  demand, labor  costs  and
other  political and economic conditions. To date, the Company has no experience
in developing a localized version of its wireless data communications system for
foreign  markets.  The  Company  believes  its  ability  to  establish  business
alliances  in each international  market will be critical  to its success. There
can be  no assurance  that the  Company will  be able  to successfully  develop,
market and implement its system in international markets or establish successful
business  alliances  for these  markets. In  addition,  there are  certain risks
inherent in  doing  business  internationally, such  as  unexpected  changes  in
regulatory  requirements, export restrictions, tariffs and other trade barriers,
difficulties in staffing and managing foreign operations, longer payment cycles,
problems in collecting accounts receivable, political instability,  fluctuations
in  currency exchange  rates and  potentially adverse  tax consequences,  any of
which could adversely impact  the Company's potential international  operations.
There  can be  no assurance that  one or  more of such  factors will  not have a
material adverse effect  on the Company's  future international operations  and,
consequently,  on its business, operating  results, financial condition and cash
flow. See "Business -- Business Strategy -- Pursue International Expansion."
    
   
    The Company intends to enter into joint ventures in order to facilitate  its
entry  into international markets.  The Company may  or may not  have a majority
interest or control of  the board of  directors of any  such joint venture.  The
risk  is present in any such joint venture in which the Company may determine to
participate, that the other joint venture partner may at any time have economic,
business or legal  interests or goals  that are inconsistent  with those of  the
joint  venture or  the Company. The  risk is  also present that  a joint venture
partner may be unable  to meet its  economic or other  obligations and that  the
Company  may be required to fulfill those obligations. In addition, in any joint
venture in which the Company does not have a majority interest, the Company  may
not  have  control over  the operations  or  assets of  such joint  venture. See
"Business -- Business Strategy -- Pursue International Expansion."
    
SHAREHOLDERS' AGREEMENT
   
    Holders of 28,188,916 shares  of Common Stock, or  69.6% of the  outstanding
Common  Stock after completion of this Offering and the Utility Stock Purchases,
are parties to a Shareholders' Agreement dated August 15, 1994, as amended  (the
"Shareholders'  Agreement"), pursuant to  which the Company  will be required to
cause all  persons  designated  for  election  by  certain  stockholders  to  be
nominated  at each  meeting of  the Company's stockholders  at which  a vote for
directors will be taken, so long as each such stockholder holds a minimum number
of shares of Common Stock. Under the Shareholders' Agreement, the Company agreed
to set the authorized number of directors at ten directors. Of these, after  the
closing of this
    
 
                                       16
<PAGE>
Offering,  nine  directors  will be  persons  designated by  certain  holders in
accordance  with   the  Shareholders'   Agreement.   In  addition,   under   the
Shareholders'  Agreement the parties thereto have  agreed that, until August 15,
1997, the  Certificate  of  Incorporation  will  not  be  amended  to  eliminate
cumulative voting and that the Board of Directors shall not be comprised of less
than  eight  directors. The  effect of  the Shareholders'  Agreement is  to give
certain stockholders greater influence over  the management of the Company  than
they  would otherwise have and to provide certain stockholders with, among other
things, certain  registration,  first refusal,  co-sale  and other  rights.  See
"Management  -- Board of Directors,"  "Certain Transactions" and "Description of
Capital Stock."
NO PRIOR PUBLIC MARKET; DETERMINATION OF OFFERING PRICE; POSSIBLE VOLATILITY OF
STOCK PRICE
   
    Prior to this offering there has been no public market for the Common Stock,
and there can be no assurance that an active public market for the Common  Stock
will  develop or  be sustained after  the Offering. The  initial public offering
price will be determined by negotiation between the Company and the Underwriters
based upon several factors, and may not be indicative of the market price of the
Common Stock after  the Offering.  See "Underwriters"  for a  discussion of  the
factors considered in determining the initial public offering price. The trading
price  of the Common Stock could be  subject to wide fluctuations in response to
quarterly variations in the Company's results of operations, uncertain  periodic
events  such as  the signing  or termination  of services  contracts, changes in
financial estimates by  analysts, variations between  the Company's results  and
results   expected  by  financial  analysts   and  investors,  announcements  of
technological innovations by the Company  or its competitors, conditions in  the
wireless  communications  industry,  regulatory  changes  or  general  market or
economic conditions and other  events or factors. In  addition, in recent  years
the  stock market has  experienced extreme price  and volume fluctuations. These
fluctuations have  had  a substantial  effect  on  the market  prices  for  many
emerging  growth companies, often unrelated to  the operating performance of the
specific companies. Such market fluctuations could adversely affect the price of
the Common Stock.
    
 
SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS
 
   
    Sales of a substantial number of shares of Common Stock in the public market
following this  Offering  could  adversely  affect  the  market  price  for  the
Company's  Common Stock. The number of shares of Common Stock available for sale
in the public  market is  limited by restrictions  under the  Securities Act  of
1933,  as amended  (the "Securities  Act"), and  lock-up agreements  pursuant to
which holders have agreed not to sell or otherwise dispose of 26,420,242  shares
for 180 days after the date of this Prospectus without the prior written consent
of Morgan Stanley & Co. Incorporated. However, Morgan Stanley & Co. Incorporated
may,  in its sole discretion and at any  time without notice, release all or any
portion of such shares.  In addition, certain other  holders have agreed not  to
sell  or otherwise dispose  of 2,839,906 shares  for 120 days  after the date of
this Prospectus. After  the expiration  of the lock-up  agreements, such  shares
will  generally be eligible for sale in the public market subject in the case of
certain shares (including shares held by affiliates) to the limitations of  Rule
144  under the Securities Act.  On the date of  this Prospectus, no shares other
than 366 shares of Common  Stock and the Shares  will be eligible for  immediate
sale  in  the  public market.  In  addition,  the Company  intends  to register,
following this Offering, a total of 3,779,136 shares of Common Stock subject  to
outstanding  options or  reserved for  issuance under  the Company's  1992 Stock
Option Plan or 1994  Stock Plan, 1,200,000 shares  of Common Stock reserved  for
issuance  under its 1996  Employee Stock Purchase Plan,  and 2,600,000 shares of
Common Stock issuable upon  exercise of warrants  which this Prospectus  assumes
will  be  exercised  upon  the  closing  of  this  Offering.  Furthermore,  upon
expiration  of  the  lock-up  agreements  referred  to  above,  the  holders  of
28,188,916  shares  of Common  Stock will  be  entitled to  certain registration
rights with respect to  such shares. Pursuant to  the agreements related to  the
Utility Stock Purchases, NSP and UE each agreed not to sell or otherwise dispose
of  50% of the  shares of Common Stock  acquired thereby for  a period of twelve
months and the remaining 50% of the shares of Common Stock acquired thereby  for
a  period of 24 months from the date of this Offering. The 1,470,833 shares sold
to NSP and UE will be eligible for sale in the public market two years from  the
closing  of the Offering, provided that the Company has agreed to register up to
one-half of the shares purchased by NSP and  UE for public sale at any time  one
year  after the closing  of the Offering.  If such holders,  by exercising their
registration rights,
    
 
                                       17
<PAGE>
   
cause a large number of shares of Common Stock to be registered and sold in  the
public  market, such sales  could have a  material adverse effect  on the market
price for the Common  Stock. See "Description of  Capital Stock --  Registration
Rights of Certain Holders" and "Shares Eligible for Future Sale."
    
 
   
SUBSTANTIAL DILUTION
    
 
    Investors  participating in this Offering  will incur immediate, substantial
dilution. To  the  extent  outstanding  options and  warrants  to  purchase  the
Company's  Common  Stock  are exercised,  there  will be  further  dilution. See
"Dilution."
 
EFFECT OF CERTAIN CHARTER PROVISIONS; ANTITAKEOVER EFFECTS OF CERTIFICATE OF
INCORPORATION, INDENTURE, DELAWARE LAW AND CERTAIN AGREEMENTS
 
   
    The Company's Board of Directors has the authority to issue up to 15,000,000
shares of  Preferred Stock  and  to determine  the price,  rights,  preferences,
privileges  and  restrictions,  including  voting  rights,  of  such  shares  of
Preferred Stock without  any further  vote or  action by  the stockholders.  The
rights  of the holders of Common Stock will  be subject to, and may be adversely
affected by, the rights of the holders of any Preferred Stock that may be issued
in the  future.  The issuance  of  Preferred Stock,  while  providing  desirable
flexibility  in  connection  with  possible  acquisitions  and  other  corporate
purposes, could have the effect of making it more difficult for a third party to
acquire a majority of the outstanding  voting stock of the Company. The  Company
has  no  current plans  to  issue shares  of  Preferred Stock.  Further, certain
provisions of the  Company's Certificate  of Incorporation and  of Delaware  law
could  discourage potential acquisition  proposals and could  delay or prevent a
change in control of the Company.  These provisions are intended to enhance  the
likelihood  of  continuity and  stability  in the  composition  of the  Board of
Directors and  in the  policies formulated  by  the Board  of Directors  and  to
discourage  certain  types  of  transactions  that  may  involve  an  actual  or
threatened change in control  of the Company. These  provisions are designed  to
reduce  the vulnerability of the Company  to an unsolicited acquisition proposal
and to discourage certain tactics that may  be used in proxy fights. Certain  of
the  Company's executive officers are parties to an Employee Severance Agreement
pursuant to which, among other things,  all of such officers' outstanding  stock
options  will vest upon the  occurrence of certain events  following a change of
control, including six months having  elapsed following such change in  control,
so  long as  such executives  remain employed by  the Company.  In addition, the
Company's Indenture (the "Senior Discount Note Indenture") governing its  Senior
Discount  Notes  provides in  the event  of  certain changes  in control  of the
Company, each holder will  have the right to  require the Company to  repurchase
such holder's Senior Discount Notes at a premium over the accreted value of such
debt. Certain provisions in the Certificate of Incorporation and Senior Discount
Note  Indenture could have the effect  of discouraging others from making tender
offers for the  Company's shares and,  as a consequence,  they also may  inhibit
increases  in  the market  price of  the Company's  shares that  could otherwise
result from actual or rumored takeover  attempts. Such provisions also may  have
the effect of limiting changes in the management of the Company. See "Management
- --  Employment Contracts and Change of Control Arrangements" and "Description of
Capital Stock -- Preferred Stock."
    
 
NO DIVIDENDS; DIVIDEND RESTRICTIONS.
 
   
    The Company has  not declared  or paid any  dividends on  its capital  stock
since  its inception. The Company currently  anticipates that it will retain all
of its future earnings, if  any, for use in the  operation and expansion of  its
business  and does not  anticipate paying any cash  dividends in the foreseeable
future. In addition, the Company's existing financing arrangements restrict  the
payment of any dividends. See "Dividend Policy."
    
 
                                       18
<PAGE>
                                USE OF PROCEEDS
 
   
    The  net proceeds to the Company from  the sale of the Shares offered hereby
are estimated to  be approximately  $92.6 million  ($106.6 million  if the  U.S.
Underwriters'  over-allotment  option  is exercised  in  full),  after deducting
estimated underwriting discounts and commissions and estimated offering expenses
payable by the Company, and the estimated  net proceeds to the Company from  the
Utility  Stock  Purchases, which  are expected  to  close concurrently  with the
closing of this Offering, are estimated to be approximately $24.96 million after
deducting estimated issuance  costs related  thereto, in each  case assuming  an
initial   public  offering  price  of  $20.00  per  share.  See  "Utility  Stock
Purchases."
    
 
   
    The Company  anticipates that  the net  proceeds of  this Offering  and  the
Utility  Stock Purchases will be used  for general corporate purposes, including
working  capital,  capital  requirements  (capital  expenditures  and   negative
operating cash flow) expected to be incurred in connection with the installation
and  operation of the Company's networks and continuing research and development
activities. A portion of the proceeds may also be used for the licensing of  new
products  or technologies, early retirement of corporate debt and for investment
purposes related to  the expansion of  its business, including  internationally,
although  the Company  currently has  no specific  plans or  commitments in this
regard. Pending  application of  the proceeds  as described  above, the  Company
intends  to  invest the  net  proceeds of  the  Offering and  the  Utility Stock
Purchases in  short-term,  interest-bearing,  investment-grade  securities.  See
"Management's  Discussion  and Analysis  of Financial  Condition and  Results of
Operations -- Liquidity and  Capital Resources." The  Company believes that  the
net proceeds of this Offering and the Utility Stock Purchases, together with its
existing cash, cash equivalents, short-term investments and anticipated interest
income  and other revenues, will be sufficient to meet its cash requirements for
at least  the next  12  months. See  "Management's  Discussion and  Analysis  of
Financial Condition and Results of Operations."
    
 
   
                            UTILITY STOCK PURCHASES
    
 
   
    NSP  has agreed to  purchase from the  Company, in a  private placement that
will occur concurrently  with the  closing of  this Offering,  shares of  Common
Stock  at an aggregate  purchase price of $15,000,000.  In addition, UE, through
its  affiliate   and   wholly-owned  subsidiary   Union   Electric   Development
Corporation,  has agreed  to purchase from  the Company, in  a private placement
that will occur concurrently with the closing of this Offering, shares of Common
Stock at an  aggregate purchase  price of  $10,000,000. The  purchase price  per
share  to be paid by  NSP will be an  amount equal to 80%  of the initial public
offering price, and the  purchase price per share  to be paid by  UE will be  an
amount  equal  to  the  initial  public  offering  price  less  the underwriting
discounts and commissions. Assuming an  initial public offering price of  $20.00
per  share,  NSP  and  UE  would purchase  937,500  shares  and  533,333 shares,
respectively. Of the  937,500 shares to  be purchased by  NSP, 104,167 of  these
shares will be placed in escrow (the "Escrow Shares"), with their release to NSP
dependent  upon NSP causing  Wisconsin Electric Power  Company ("WEPC") to enter
into a letter of intent  with the Company by September  16, 1996 and a  services
agreement  for at least 750,000 meters with the Company by December 31, 1997. If
either or both such events do not occur, 50% or 100% as the case may be, of  the
Escrow  Shares will revert to the Company, which will effectively increase NSP's
purchase price per  share to  85% or 90%,  respectively, of  the initial  public
offering price. WEPC and NSP are parties to a pending merger agreement, which is
subject  to regulatory approval. In the event  that any of the Escrow Shares are
released to WEPC,  the fair value  of such shares  will be expensed  as a  sales
discount  over  the  term  of  the  NSP  services  agreement.  See "Management's
Discussion   and   Analysis    of   Financial   Condition    and   Results    of
Operations--Results of Operations."
    
 
                                DIVIDEND POLICY
 
   
    The  Company has  not declared  or paid any  dividends on  its capital stock
since its inception. The Company currently  anticipates that it will retain  all
of  its future earnings, if  any, for use in the  operation and expansion of its
business and does not  anticipate paying any cash  dividends in the  foreseeable
future, and any changes in the Company's dividend policies will be determined by
its  Board  of Directors.  The  Company's existing  financing  arrangements also
restrict the payment of any dividends.  The Company anticipates that it and  its
subsidiaries  will  incur  substantial additional  indebtedness,  which  is also
likely to restrict the payment of dividends.
    
 
                                       19
<PAGE>
                                 CAPITALIZATION
 
   
    The following table sets forth (i)  the capitalization of the Company as  of
June  30, 1996, (ii)  the pro forma  capitalization of the  Company after giving
effect to the automatic conversion of all outstanding shares of Preferred  Stock
into  Common Stock, the  issuance of 4,132,970  shares of Common  Stock upon the
assumed exercise of certain outstanding  warrants for aggregate proceeds to  the
Company of $3.7 million and the reincorporation of the Company in Delaware which
occurred  on August 30,  1996, and (iii)  the as adjusted  capitalization of the
Company to reflect the receipt  of the estimated net  proceeds from the sale  of
Common  Stock offered hereby at an assumed  initial offering price of $20.00 per
share and after deducting estimated  underwriting discounts and commissions  and
estimated  offering  expenses payable  by  the Company  and  the receipt  of the
estimated net proceeds of $24.9 million from the sale of Common Stock to NSP and
UE.
    
 
   
<TABLE>
<CAPTION>
                                                                                       JUNE 30, 1996
                                                                          ---------------------------------------
                                                                            ACTUAL       PRO FORMA    AS ADJUSTED
                                                                          -----------  -------------  -----------
                                                                                      (IN THOUSANDS)
<S>                                                                       <C>          <C>            <C>
Long-term obligations(1)................................................  $   195,513   $   195,513    $ 195,513
                                                                          -----------  -------------  -----------
Series CC redeemable convertible preferred stock, $.001 par value;
 3,215,768 shares designated and outstanding actual; no shares
 outstanding pro forma and as adjusted..................................       29,486       --            --
                                                                          -----------  -------------  -----------
Stockholders' equity (deficit):
  Convertible preferred stock, $.001 par value; 15,000,000 shares
   authorized; 9,137,078 shares outstanding actual; no shares
   outstanding pro forma and as adjusted................................       27,196       --            --
  Common Stock, $.001 par value; 50,000,000 shares authorized; 5,209,472
   shares outstanding actual; 34,048,134 shares outstanding pro
   forma(2); and 40,518,967 shares outstanding as adjusted(3)...........       27,636        90,947      208,457
  Notes receivable from sale of Common Stock............................         (866)         (866)        (866)
  Warrants..............................................................        2,984             9            9
  Accumulated deficit...................................................     (127,334)     (127,334)    (127,334)
  Net unrealized loss on short-term investments.........................          (16)          (16)         (16)
                                                                          -----------  -------------  -----------
    Total stockholders' equity (deficit)................................      (70,400)      (37,260)      80,250
                                                                          -----------  -------------  -----------
      Total capitalization..............................................  $   154,599   $   158,253    $ 275,763
                                                                          -----------  -------------  -----------
                                                                          -----------  -------------  -----------
</TABLE>
    
 
- ---------
   
(1) Consists  primarily  of  Senior  Discount  Notes.  See  Notes  5  and  9  to
    Consolidated Financial Statements.
    
 
   
(2) Excludes  3,779,136 shares  of Common  Stock issuable  upon the  exercise of
    outstanding options as of  June 30, 1996, with  a weighted average  exercise
    price  of $0.625 per share  and 52,610 shares of  Common Stock issuable upon
    exercise of  outstanding warrants  to purchase  Common Stock  at a  weighted
    average  exercise price  of $7.59  per share.  See "Management  -- Incentive
    Stock Plans,"  "Description of  Capital Stock  -- Warrants"  and Note  7  to
    Consolidated Financial Statements.
    
 
   
(3) Includes  104,167 shares of Common Stock that will be issued and outstanding
    at the closing of this  Offering and held in  escrow in connection with  the
    NSP  Purchase.  If  NSP  achieves certain  milestones  under  the  NSP Stock
    Purchase Agreement, such Escrow Shares will be released to NSP. If NSP  does
    not  achieve such milestones, such Escrow Shares will revert to the Company.
    See "Utility Stock Purchases."
    
 
                                       20
<PAGE>
                                    DILUTION
 
   
    The pro forma deficit in net tangible  book value of the Company as of  June
30,  1996 was $43.4 million or $1.27  per share of outstanding Common Stock. The
pro forma deficit in net tangible book value per share represents the  Company's
total  assets less net  intangibles of $6.1 million  and less total liabilities,
divided by the number of shares of Common Stock outstanding (after giving effect
to the automatic conversion of the  Preferred Stock and the exercise of  certain
warrants  upon the closing of this  Offering). Dilution per share represents the
difference between the price  per share paid by  investors in this Offering  and
the  as adjusted pro forma  net tangible book value  per share immediately after
this Offering. After giving effect to the sale of the 5,000,000 shares of Common
Stock offered hereby at an assumed  initial public offering price of $20.00  per
share  (after deducting the estimated underwriting discounts and commissions and
offering expenses)  and the  sale of  1,470,833 shares  of Common  Stock in  the
Utility  Stock Purchases  for aggregate net  proceeds of $24.96  million, the as
adjusted pro forma net tangible book value of the Company at June 30, 1996 would
have been $74.1 million,  or approximately $1.83 per  share. This represents  an
immediate  decrease in the pro forma deficit in net tangible book value of $3.10
per share to existing stockholders and an immediate dilution of $18.17 per share
to new investors purchasing shares at the assumed initial public offering price.
The following table illustrates this per share dilution:
    
 
   
<TABLE>
<S>                                                                         <C>        <C>
Assumed initial public offering price per share...........................             $   20.00
  Pro forma net tangible book value (deficit) per share as of June 30,
   1996...................................................................  $   (1.27)
  Increase attributable to the Utility Stock Purchases....................       0.75
  Increase attributable to sale of Shares in the Offering.................       2.35
                                                                            ---------
As adjusted pro forma net tangible book value per share after the
 Offering.................................................................                  1.83
                                                                                       ---------
Dilution per share to investors in the Offering...........................             $   18.17
                                                                                       ---------
                                                                                       ---------
</TABLE>
    
 
   
    The following table summarizes, on  a pro forma basis  as of June 30,  1996,
the  number of shares of Common Stock purchased from the Company, the total cash
consideration paid  and  the  average  price per  share  paid  by  the  existing
stockholders,   by  the  new   investors  in  the   Offering  (before  deducting
underwriting discounts and commissions) and estimated offering expenses  payable
by the Company, at an assumed initial public offering price of $20.00 per share,
and by NSP and UE in the Utility Stock Purchases:
    
 
   
<TABLE>
<CAPTION>
                                                                                       TOTAL
                                                     SHARES PURCHASED           CASH CONSIDERATION
                                                 -------------------------  ---------------------------      AVERAGE
                                                    NUMBER       PERCENT        AMOUNT        PERCENT    PRICE PER SHARE
                                                 ------------  -----------  --------------  -----------  ---------------
<S>                                              <C>           <C>          <C>             <C>          <C>
Existing stockholders..........................    34,048,134       84.0%   $  106,621,000       46.0%      $    3.13
Utility Stock Purchases........................     1,470,833        3.6        25,000,000       10.8       $   17.00
Investors in the Offering......................     5,000,000       12.4       100,000,000       43.2       $   20.00
                                                 ------------        ---    --------------        ---
    Total......................................    40,518,967        100%   $  231,621,000        100%
                                                 ------------        ---    --------------        ---
                                                 ------------        ---    --------------        ---
</TABLE>
    
 
   
    The foregoing table assumes the automatic conversion of all Preferred Stock,
the  exercise  of warrants  to  purchase 4,132,970  shares  of Common  Stock, no
exercise of  the U.S.  Underwriters' over-allotment  option and  no exercise  of
stock  options or other warrants outstanding at June 30, 1996. At June 30, 1996,
there were options outstanding to purchase 3,779,136 shares of Common Stock at a
weighted  average  exercise  price  of  $0.625  per  share  and  other  warrants
outstanding  to purchase  52,610 shares  of Common  Stock at  a weighted average
exercise price  of  $7.59 per  share.  To  the extent  outstanding  options  and
warrants  are exercised,  there will be  further dilution to  new investors. See
"Management  --  Incentive  Stock  Plans,"  "Description  of  Capital  Stock  --
Warrants" and Note 7 to Consolidated Financial Statements.
    
 
                                       21
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
    The  following  selected  consolidated  financial  data  should  be  read in
conjunction with  the Company's  Consolidated Financial  Statements and  related
Notes  thereto and "Management's Discussion  and Analysis of Financial Condition
and  Results  of  Operations"  included   elsewhere  in  this  Prospectus.   The
consolidated statement of operations data for the years ended December 31, 1993,
1994  and 1995, and the consolidated balance sheet data at December 31, 1994 and
1995  are  derived  from,  and  are  qualified  by  reference  to,  the  audited
consolidated  financial statements  included elsewhere  in this  Prospectus. The
consolidated statement of operations data for the years ended December 31,  1991
and  1992 and the consolidated balance sheet data at December 31, 1991, 1992 and
1993 are derived  from audited  consolidated financial  statements not  included
herein.  The consolidated statement of operations  data for the six months ended
June 30, 1995 and 1996 and the consolidated balance sheet data at June 30,  1996
are  derived from unaudited  consolidated financial statements  that include, in
the opinion of management, all adjustments, consisting of only normal, recurring
adjustments, necessary  for a  fair presentation  of the  information set  forth
therein.  The consolidated results  of operations for the  six months ended June
30, 1996 or any other period are not necessarily indicative of future results.
 
   
<TABLE>
<CAPTION>
                                                                                                       SIX MONTHS ENDED
                                                             YEAR ENDED DECEMBER 31,                       JUNE 30,
                                              -----------------------------------------------------  --------------------
                                                1991       1992       1993       1994       1995       1995       1996
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
  Revenues..................................  $   7,408  $   3,148  $   1,757  $   1,651  $   2,126  $   1,291  $     420
  Costs and expenses:
    Cost of revenues........................      6,943      2,509      1,840      1,191      5,129      1,931      3,483
    Research and development................      7,765      6,838      5,262      9,693     22,380      6,735     13,009
    Marketing and sales.....................      3,037      1,523      1,447      3,257      4,201      1,946      2,924
    General and administrative..............      2,048        843      1,450      2,583      6,805      2,874      5,412
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total costs and expenses..................     19,793     11,713      9,999     16,724     38,515     13,486     24,828
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Loss from operations......................    (12,385)    (8,565)    (8,242)   (15,073)   (36,389)   (12,195)   (24,408)
  Other income (expense)....................       (178)      (378)      (148)       441     (4,564)        75     (7,903)
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Loss before income taxes..................    (12,563)    (8,943)    (8,390)   (14,632)   (40,953)   (12,120)   (32,311)
  Provision for income taxes................     --         --              1          2          3          1          2
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net loss..................................  $ (12,563) $  (8,943) $  (8,391) $ (14,634) $ (40,956) $ (12,121) $ (32,313)
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Pro forma net loss per share(1)...........                                              $   (1.22)            $   (0.94)
                                                                                          ---------             ---------
                                                                                          ---------             ---------
  Shares used in computing pro forma net
   loss per share(1)........................                                                 33,497                34,483
                                                                                          ---------             ---------
                                                                                          ---------             ---------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                DECEMBER 31,                            JUNE 30, 1996
                                            -----------------------------------------------------  ------------------------
                                              1991       1992       1993       1994       1995      ACTUAL    PRO FORMA(2)
                                            ---------  ---------  ---------  ---------  ---------  ---------  -------------
                                                                            (IN THOUSANDS)
<S>                                         <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash, cash equivalents and short-term
   investments............................  $     669  $   2,236  $   8,884  $  24,508  $ 143,797  $ 102,967      $106,621
  Total assets............................      4,833      4,123     11,510     31,809    184,306    162,653       166,307
  Long-term obligations...................      1,598      1,734        825        546    183,348    195,513       195,513
  Series CC redeemable convertible
   preferred stock........................     --         --         --         29,486     29,486     29,486       --
  Total stockholders' equity (deficit)....     (3,065)      (235)     8,011     (1,564)   (38,103)   (70,400)     (37,260)
</TABLE>
    
 
- ------------
   
(1)  See Note 1 to Consolidated Financial  Statements for an explanation of  the
     determination  of the number of shares used in computing pro forma net loss
     per share.
    
 
   
(2)  Reflects the conversion of all  outstanding shares of Preferred Stock  into
     Common  Stock and the exercise of  warrants to purchase 4,132,970 shares of
     Common Stock at an aggregate  exercise price of approximately $3.7  million
     upon the closing of this Offering.
    
 
                                       22
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
   
    THE   FOLLOWING  DISCUSSION  OF  THE  FINANCIAL  CONDITION  AND  RESULTS  OF
OPERATIONS OF CELLNET DATA SYSTEMS, INC. SHOULD BE READ IN CONJUNCTION WITH  THE
CONSOLIDATED  FINANCIAL STATEMENTS AND RELATED  NOTES THERETO INCLUDED ELSEWHERE
IN THIS PROSPECTUS.  CERTAIN OF THE  INFORMATION CONTAINED IN  THIS SECTION  AND
ELSEWHERE IN THIS PROSPECTUS, INCLUDING INFORMATION WITH REGARD TO THE COMPANY'S
EXPECTED  WIRELESS DATA  COMMUNICATIONS NETWORK DEPLOYMENTS  AND OPERATIONS, ITS
STRATEGY FOR  MARKETING  AND  DEPLOYING  SUCH  NETWORKS  AND  RELATED  FINANCING
ACTIVITIES,   CONTAIN   FORWARD-LOOKING  STATEMENTS   THAT  INVOLVE   RISKS  AND
UNCERTAINTIES. THE  COMPANY'S  ACTUAL  RESULTS  MAY  DIFFER  SIGNIFICANTLY  FROM
RESULTS  DISCUSSED IN THE  FORWARD-LOOKING STATEMENTS. FACTORS  THAT MIGHT CAUSE
SUCH DIFFERENCES  INCLUDE, BUT  ARE NOT  LIMITED TO,  THOSE DISCUSSED  IN  "RISK
FACTORS."
    
 
OVERVIEW
 
    The  Company  intends  to  deploy  and operate  a  series  of  wireless data
communications networks  pursuant to  long-term contracts  with utility  company
customers  and  to earn  recurring  revenues by  providing  NMR services  to the
utilities  and  using  the   network  to  support   a  variety  of   non-utility
applications.  The Company's business strategy has affected and will continue to
affect its financial condition and results of operations as follows:
 
   
    CHANGING COMPOSITION OF REVENUES.   The Company's  revenues in recent  years
have  been primarily attributable to sales of,  and contract fees related to the
development of,  miscellaneous  utility  communication  equipment.  The  Company
believes  that such revenues will be  largely non-recurring and will diminish to
relatively insignificant levels over the next few years. The Company derives  an
increasing proportion of its revenues from fees earned under services agreements
related  to its wireless  communications networks. Under  the Company's existing
services agreements with KCPL, UE, NSP  and Puget, the Company receives  monthly
NMR  service fees based  on the number  of endpoint devices  that are in revenue
service during the applicable month to bill customers.
    
 
    UNEVEN REVENUE  GROWTH.   The  timing and  amount  of the  Company's  future
revenues  will depend upon its ability  to obtain additional services agreements
with  utilities  and  other  customers   and  upon  the  Company's  ability   to
successfully  deploy  and  operate  its  wireless  communications  networks. New
services agreements are expected to be obtained on an irregular basis, and there
may be  prolonged periods  during which  the  Company does  not enter  into  any
additional  services  agreements.  As a  result,  the Company  expects  that its
revenues will not  grow smoothly over  time, but will  increase unevenly as  the
Company  enters into  new services agreements,  and may decrease  sharply in the
event that  any  of its  existing  services  agreements are  terminated  or  not
renewed.  See  "Risk  Factors  --  Uncertainty  of  Future  Revenues; Increasing
Installation Costs;  Need for  Additional  Services Contracts;  and  Fluctuating
Operating Results."
 
   
    REVENUES  LAG NETWORK  DEPLOYMENT.   The Company  generally realizes network
service revenue under a services agreement with a utility only when a portion of
the network is installed and the utility has begun billing customers based  upon
NMR  data.  The Company  did not  begin  to receive  revenue under  its services
contracts with  KCPL and  UE  until approximately  one  year after  signing  the
respective  services agreements. The Company expects that its receipt of network
service revenue  under future  contracts will  lag the  signing of  the  related
services  agreements by a minimum of six  months and that it will generally take
two to four  years to  complete installation of  a network  after each  services
agreement  has been  signed. A  network's service  revenues are  not expected to
exceed the Company's capital  investments and expenses  incurred to deploy  such
network  for several years.  The Company signed  agreements with KCPL  and UE in
August 1994 and August 1995, respectively, and did not receive its first revenue
under the KCPL  and UE services  agreements until September  1995 and May  1996,
respectively.  The Company expects to complete the  KCPL network in 1996 and the
UE network in 1998. The Company began the installation of both the NSP and Puget
networks in August 1996.  As additional segments of  the Company's networks  are
installed  and used  by its  utility clients  for billing  purposes, the Company
expects to realize  a corresponding  increase in its  network service  revenues.
However,  if the Company is able to  successfully deploy an increasing number of
networks over the next few  years, the operating losses  created by this lag  in
revenues, and negative cash flow resulting
    
 
                                       23
<PAGE>
   
from  such operating losses and the capital expenditures expected to be required
in connection with the installation of such networks, are expected to widen  for
a  period of time and will continue until the operating cash flow from installed
networks exceeds the costs of deploying and operating additional networks.
    
 
   
    IMPACT OF RAPID EXPANSION.   CellNet will not  typically invest the  capital
necessary  to deploy a wireless communications  network prior to entering into a
long-term services agreement with a  utility or other customer. However,  during
its  expansion phase, the Company will be required to invest significant amounts
of capital in  its networks and  to incur substantial  and increasing sales  and
marketing  expenses  before receiving  any return  on such  expenditures through
network service revenues. The Company has incurred substantial operating  losses
since  inception and, as of June 30,  1996, had an accumulated deficit of $127.3
million. The  Company  does not  expect  significant revenues  during  1996  and
expects  to incur substantial  and increasing operating  losses and negative net
cash flow after capital  expenditures for the foreseeable  future as it  expands
its  research  and development  and  marketing efforts  and  installs additional
networks.  The  Company  does  not  expect  positive  cash  flow  after  capital
expenditures  from its  NMR services operations  for several  years. The Company
will require  substantial  capital  to  fund  cash  flow  deficits  and  capital
expenditures   for  the  foreseeable   future  and  expects   to  finance  these
requirements  through  significant  additional  external  financing.  See  "Risk
Factors  -- History  and Continuation of  Operating Losses"  and "-- Substantial
Leverage and Ability to Service Debt; Substantial Future Capital Needs."
    
 
   
    INTEREST INCOME.   The Company  has earned substantial  amounts of  interest
income  on short-term investments  of the proceeds  of its financing activities,
and expects  to earn  additional interest  income through  the investment  of  a
portion  of  the  proceeds of  this  Offering.  The Company  expects  to utilize
substantially all of its  cash, cash equivalents  and short-term investments  in
deploying  its  wireless  communications networks,  in  continuing  research and
development activities  related thereto  and in  related selling  and  marketing
activities. As such funds are expended, interest income is expected to decrease.
See "Use of Proceeds."
    
 
RESULTS OF OPERATIONS
 
    REVENUES
 
   
    Revenues  for the three  years ended December  31, 1993, 1994  and 1995 were
$1.8 million, $1.7 million and $2.1 million, respectively. Revenues for the  six
months   ended  June  30,  1995  and   1996  were  $1.3  million  and  $420,000,
respectively. Revenues prior to 1996 were are attributable primarily to  product
sales  and development  and other contract  revenues unrelated  to the Company's
current focus of providing NMR services that were largely non-recurring and that
are expected to decline and remain  at relatively insignificant levels over  the
next  few years. During  1993, Pacific Gas &  Electric Company ("PG&E"), Georgia
Power Company ("Georgia Power") and  NSP accounted for 37%,  36% and 18% of  the
the  Company's revenues, respectively. During 1994,  NSP, Georgia Power and PG&E
accounted for 58%, 14% and 10%  of the Company's revenues, respectively.  During
1995,  NSP  and  KCPL accounted  for  64%  and 29%  of  the  Company's revenues,
respectively. Revenues for the six months ended June 30, 1996 declined  $870,000
from  the comparable  period in  1995. The  decline resulted  primarily from the
transition from product  sales to  network service revenues.  The Company's  NMR
service  revenues for the  year ended December  31, 1995 and  for the six months
ended June 30, 1996 were $35,000 and $244,000, respectively. In September  1995,
the  Company  began  to  receive  regular  monthly  revenue  under  its services
agreement with KCPL based upon the  number of automated meters installed on  the
network  that  were being  used by  KCPL to  bill its  customers and  the agreed
monthly NMR charge per meter. In May 1996, the Company began to realize  regular
monthly  revenue from  its services  agreement with UE  on a  similar basis. The
Company will not recognize revenue earned under its services agreements with NSP
or Puget until  the automated meters  installed on the  respective networks  are
used  by  such  utility  clients  for  billing  their  respective  customers. In
connection with the NSP Purchase, the Company has agreed to issue Escrow  Shares
which will be released upon the occurrence of certain milestones associated with
entering  into a  letter of intent  and an  NMR services agreement  with WEPC by
December 1997. The fair value of these Escrow Shares will be expensed as a sales
discount over the term of  the WEPC services agreement,  in the event that  such
milestones are achieved. See "Utility Stock Purchases."
    
 
                                       24
<PAGE>
    The   Company  generally  realizes  service   revenues  under  its  services
agreements with  utilities  only  when  its networks  or  portions  thereof  are
successfully  installed  and operating  and  the utility  commences  billing its
customers based upon the NMR data obtained. Revenues are expected to increase as
the Company continues to install its networks, the networks or portions  thereof
become  operational, and utilities begin billing their customers based upon data
obtained over the CellNet system. Due primarily to the nature, amount and timing
of revenues received to date, no meaningful period-to-period comparisons can  be
made. Revenues received during the years ended December 31, 1993, 1994 and 1995,
and  for the six-month periods  ended June 30, 1995  and 1996, respectively, are
not reliable indicators of revenues that might be expected in the future.
 
    COST OF REVENUES
 
   
    Cost of revenues historically have consisted  of the cost of product  sales.
For the year ended December 31, 1995 and for the six months ended June 30, 1996,
cost  of  revenues  primarily consisted  of  network operations  costs.  Cost of
revenues were $1.8 million,  $1.2 million and $5.1  million for the years  ended
December  31, 1993, 1994  and 1995, respectively.  Cost of revenues  for the six
months ended  June  30,  1995 and  1996  were  $1.9 million  and  $3.5  million,
respectively. The increase in cost of revenues was driven by increasing costs of
providing  network services, due primarily to  growth in the number of employees
and associated costs  necessary for  network monitoring  operations at  customer
sites  and  at the  Company's  headquarters, network  deployment  management and
customer  training.  Costs  of  network  services  also  include  the  increased
installation,   applications  and  RF  engineering  staffing  at  the  Company's
headquarters  to  support  anticipated  additional  utility  contracts.  Network
services  do not currently generate a profit as the Company has not yet achieved
a scale of services  sufficient to cover network  costs. The Company will  incur
significant  and increasing costs primarily  attributed to network operation and
depreciation. Once a  network has  been fully installed,  costs associated  with
generating  network revenues will consist  primarily of maintaining a monitoring
center for such network, network depreciation and miscellaneous maintenance  and
operating expenses.
    
 
    OPERATING EXPENSES
 
   
    Operating  expenses, consisting  of research and  development, marketing and
sales, and general and  administrative costs, were  $8.2 million, $15.5  million
and  $33.4  million  for the  years  ended  December 31,  1993,  1994  and 1995,
respectively. Operating expenses for the six months ended June 30, 1995 and 1996
were $11.6 million and  $21.3 million, respectively.  The increase in  operating
expenses  on a  period to  period basis is  attributable to  the Company's rapid
growth and  to  increasing research  and  development and  marketing  and  sales
expenditures.  The Company expects to continue to spend a significant portion of
its resources on research and development activities for the foreseeable future.
Marketing and  sales  and  general  and administrative  costs  are  expected  to
increase in the future as the Company seeks to sign new service agreements.
    
 
   
    RESEARCH  & DEVELOPMENT.  Research and development expenses are attributable
largely to continuing system software, firmware and equipment development costs,
prototype  manufacturing,  testing,  personnel   costs,  consulting  fees,   and
supplies. Research and development costs are expensed as incurred. The Company's
networks  include  certain software  applications  which are  integral  to their
operation. The costs to develop such  software have not been capitalized as  the
Company   believes  its  software  development  is  essentially  completed  when
technological feasibility  of the  software and/or  development of  the  related
network  hardware is  established. Research  and development  expenses were $5.3
million, $9.7 million and $22.4 million  for the years ended December 31,  1993,
1994  and  1995, respectively.  Research and  development  expenses for  the six
months ended  June  30, 1995  and  1996 were  $6.7  million and  $13.0  million,
respectively.  Research  and development  spending  increases in  1995  and 1996
reflect primarily  additions  to  the  Company's  engineering  staff  and  costs
associated  with development of processes to  retrofit utility meters for use in
the CellNet network. Deployment of the Company's first network in 1995  resulted
in  increased materials  used for  prototypes, nonrecurring  engineering charges
associated with establishing  relationships with  third-party manufacturers  and
rapid   changes  to   the  firmware  and   software  utilized   in  the  CellNet
    
 
                                       25
<PAGE>
   
network. The  Company  expects  that  research  and  development  expenses  will
increase  moderately  in  the  near term.  However,  significant  investments in
research and development may become necessary to remain competitive, to  respond
to market changes or to establish international operations.
    
 
   
    MARKETING  & SALES.   Marketing  and sales  expenses consist  principally of
compensation, including  commissions  paid  to sales  and  marketing  personnel,
travel, advertising, trade show and other promotional costs. Marketing and sales
expenses  were $1.4 million, $3.3  million and $4.2 million  for the years ended
December 31, 1993, 1994 and 1995, respectively. Marketing and sales expenses for
the six months ended June 30, 1995 and 1996 were $1.9 million and $2.9  million,
respectively.  The Company expects  marketing and sales  expenses to continue to
increase in absolute  dollars as the  Company seeks to  enter into new  services
agreements.
    
 
   
    GENERAL  &  ADMINISTRATIVE.   General  and  administrative  expenses include
compensation paid to general management and administrative personnel, recruiting
costs, travel,  and communications  and other  general administrative  expenses,
including  fees for  professional services. General  and administrative expenses
were $1.5 million, $2.6  million and $6.8 million  for the years ended  December
31,  1993, 1994 and 1995, respectively.  General and administrative expenses for
the six months ended June 30, 1995 and 1996 were $2.9 million and $5.4  million,
respectively.  The  Company  expects  general  and  administrative  expenses  to
continue to increase in absolute dollars  as the Company increases staffing  and
continues  developing  information systems  to support  its planned  growth. The
Company may need to increase administrative  expenditures in the longer term  to
expand domestic and establish international operations.
    
 
    INTEREST INCOME AND EXPENSE
 
   
    Prior to June 1995 the Company funded its liquidity needs primarily from the
issuance of equity securities. In June and November 1995, the Company issued and
sold  a total of $325.0 million aggregate principal amount at maturity of Senior
Discount Notes  and  Warrants  to  purchase 2,600,000  shares  of  Common  Stock
("Warrants")   for  proceeds,  net   of  issuance  costs,   of  $169.9  million.
Accordingly, the Company  has earned  interest income on  the invested  proceeds
from  the  Senior  Discount  Notes and  Warrants  and  has  incurred significant
interest expense from the  amortization of the original  issue discount on  such
debt.
    
 
   
    Interest  income has been  and will continue  to be received  by the Company
from the short-term investment of proceeds from the issuance of equity and  debt
securities  pending  the  use  of  such  proceeds  by  the  Company  for capital
expenditures and operating and other expenses.  In June 1995, the Company  began
to  receive substantially increased amounts of interest income on the short-term
investment of  the proceeds  received from  the  issue and  sale of  its  Senior
Discount  Notes and Warrants. Interest income  is expected to be highly variable
over time as  proceeds from the  issue and  sale of additional  equity and  debt
securities  are received and as  funds are used by  the Company in its business.
Interest income for the three years ended  December 31, 1993, 1994 and 1995  was
$66,000,  $555,000 and $4.6  million, respectively. Interest  income for the six
months ended  June  30,  1995  and  1996 was  $1.0  million  and  $3.5  million,
respectively.
    
 
   
    No  interest on the Senior  Discount Notes is payable  prior to December 15,
2000.  Thereafter  until  maturity  in  June  2005,  interest  will  be  payable
semi-annually in arrears on each December 15 and June 15. The carrying amount of
the  Senior Discount  Notes accretes  from the date  of issue  and the Company's
interest expense includes such accretion. Interest expense for periods prior  to
June  1995 was  attributable primarily to  capital leases.  Interest expense was
$198,000, $101,000 and $9.3 million for the years ended December 31, 1993,  1994
and  1995, respectively. Interest expense for the six months ended June 30, 1995
and 1996 was $754,000 and $11.3 million, respectively.
    
 
    PROVISION FOR INCOME TAXES
 
    The Company has not  provided for or  paid federal income  taxes due to  the
Company's  net losses. A  nominal provision has been  recorded for various state
minimum income and franchise taxes.
 
   
    At December 31, 1995,  the Company had net  operating loss carryforwards  of
approximately  $82.5 million and $7.3 million available to offset future federal
and California  taxable  income, respectively.  The  extent to  which  the  loss
carryforwards  can  be used  to offset  future taxable  income will  be limited,
because of the
    
 
                                       26
<PAGE>
ownership changes within any three-year period as provided in the Tax Reform Act
of 1986 and the California Conformity Act of 1987. This Offering is expected  to
trigger  such a limitation. The annual usage will be limited by the market value
of the Company at the  closing of this Offering  multiplied by the then  current
long-term  tax exempt interest  rate. Such federal  carryforwards expire in 2001
through 2010. Such state carryforwards expire  in 1996 through 2000. Based  upon
the  Company's  history of  operating losses  and expiration  dates of  the loss
carryforwards, the Company has recorded a valuation allowance to the full extent
of its net deferred tax assets.
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
    The Company  requires  significant  amounts  of  capital  for  research  and
development  in  connection with  the  development of  its  proprietary wireless
communications network and related products and services, for investments in the
installation and testing of  such networks and for  related sales and  marketing
and general and administrative expenses. Historically, the Company has satisfied
its  liquidity  requirements  primarily through  external  financings, including
private placements of  equity and  debt securities and  interest income  derived
from  the investment of the proceeds of its financing activities. The discussion
in this section excludes the effect of warrants to purchase 4,132,970 shares  of
Common  Stock, which the Company assumes  will be exercised immediately prior to
the closing of this Offering for expected proceeds of $3.7 million.
    
 
    In 1993, 1994, 1995 and the first six  months of 1996, net cash used in  the
Company's  operating  activities  totaled  $9.1  million,  $14.6  million, $24.6
million and $18.9 million, respectively.  Net cash used in operating  activities
resulted primarily from cash used to fund net operating losses.
 
   
    In  1993, 1994 and 1995 and the first  six months of 1996, net cash provided
by (used for) the  Company's financing activities  totaled $16.2 million,  $34.0
million, $170.9 million and $(131,000), respectively, including cash provided by
the  private sale  of the  Company's equity  securities of  $13.4 million, $34.1
million and  $1.4 million  in 1993,  1994 and  1995, respectively.  In June  and
November  1995, the  Company received  an aggregate  of $175.8  million of gross
proceeds ($169.9 million in  net proceeds) from the  private sale of the  Senior
Discount  Notes and Warrants. During  the first six months  of 1996, the Company
financed its  operations primarily  from the  proceeds of  the offering  of  the
Senior  Discount  Notes  and Warrants,  together  with interest  income  of $3.5
million. In September 1996, NSP and  UE signed agreements to purchase shares  of
Common  Stock  concurrent with  the  closing of  this  Offering at  an estimated
aggregate purchase price of  $25,000,000. See "Utility  Stock Purchases." As  of
June 30, 1996, the Company had cash, cash equivalents and short-term investments
totalling $103.0 million.
    
 
    The  Senior Discount Notes were issued  at a substantial discount from their
aggregate principal amount at maturity  of $325.0 million. Although interest  is
not  payable  on the  Senior  Discount Notes  prior  to December  15,  2000, the
carrying amount  of  such  indebtedness  will increase  as  the  original  issue
discount  is amortized through  maturity in June 2005.  Beginning June 15, 2000,
the Senior Discount Notes will bear  interest, payable semi-annually, at a  rate
of  13%  per annum,  with payments  commencing December  15, 2000.  No principal
payments on the Senior Discount Notes are due prior to maturity in 2005.
 
   
    In 1993, 1994 and 1995, net cash used for investing activities totaled  $3.4
million,  $12.8 million  and $110.8 million,  respectively and in  the first six
months of 1995, net cash used in  investing activities was $36.6 million and  in
the  first six months of  1996, net cash provided  from investing activities was
$41.7  million.  The  Company's  investing  activities  consisted  primarily  of
purchases of network components and inventory, the construction and installation
of  networks,  purchases of  property and  equipment,  and purchases,  sales and
maturities of short-term investments. The $41.7 million of net cash provided  by
investing activities in the first six months of 1996 was largely attributable to
proceeds  of  short-term  investments.  These  proceeds  exceed  investments  in
short-term  instruments  as  the  Company   used  the  proceeds  of   short-term
investments to fund its operating activities. The Company shortened the maturity
of  its portfolio  of short-term  investments to  less than  90 days,  which are
classified, accordingly, as cash equivalents.
    
 
    Deployments of the Company's  wireless communications networks will  require
substantial  additional capital. In addition, funds will be required for further
enhancements to the system software,  firmware, hardware and other equipment  to
increase  the speed, capacity and functionality of the system, to enhance system
productivity over time  and to  expand the scope  of utility  and other  network
information services that
 
                                       27
<PAGE>
   
may be offered on the CellNet system. The Company currently estimates that funds
required  for capital expenditures relating  to the buildout of  its KCPL and UE
networks will be  approximately $22.5 million  from June 30,  1996 through  year
end.  Although  the  Company  is  currently  unable  to  predict  the  amount of
expenditures that may be incurred in connection with the establishment of  other
networks  or the amount  of expenditures to  be made after  1996 with respect to
KCPL and  UE,  the Company  expects  that cash  used  for the  construction  and
installation  of networks  and for the  purchase of property  and equipment will
increase substantially as and when the Company obtains new services  agreements,
and that the Company will require significant amounts of additional capital from
external   sources.  Sources  of  additional  capital  may  include  project  or
conventional bank financing,  public and  private offerings of  debt and  equity
securities  and cash generated  from operating activities.  To provide financing
for installation of the Company's network  under its UE services agreement,  the
Company  has received a commitment from  Toronto Dominion Bank for $25.0 million
for  a  nine-year   and  three-month  secured   revolving  credit  facility   on
conventional  bank  financing  terms.  This commitment  is  subject  to standard
conditions including satisfactory  documentation. The Company  will pay  Toronto
Dominion  Bank fees  of up  to $500,000  in connection  with this  facility. The
Company expects that a  substantial portion of its  future financing will be  at
the  subsidiary level on  a project basis.  The Company expects  to obtain third
party financing  for  the  construction  of  wireless  networks,  based  on  the
projected  cash flow expected to  be generated from such  projects, after it has
entered into a long-term contract with  a utility. The Company expects that  the
recurring  revenue stream from the long-term  services contract will support the
amortization of  debt raised  for the  project involved.  The Company  does  not
anticipate deriving any significant cash from operations for several years.
    
 
   
    The Company believes that the net proceeds of the Offering and from the sale
of  Common Stock pursuant to the Utility Stock Purchases, together with existing
cash, cash equivalents and anticipated interest income and other revenues,  will
be  sufficient to meet  its cash requirements  for at least  the next 12 months.
Thereafter, the  Company expects  that it  will require  substantial  additional
capital.  The extent of additional  financing will depend on  the success of the
Company's business. The  Company expects to  incur significant operating  losses
and  to generate  increasingly negative  net cash  flow during  the next several
years while it develops and  installs its network communications systems.  There
can  be no assurance that additional financing  will be available to the Company
or, if available, that it can be obtained on terms acceptable to the Company and
within the limitations contained in the  Senior Discount Note Indenture or  that
may  be contained in any additional  financing arrangements. The Senior Discount
Note Indenture contains certain  covenants that limit  the Company's ability  to
incur  additional indebtedness.  Future financings  may be  dilutive to existing
stockholders. Failure to  obtain such  financing could  result in  the delay  or
abandonment  of some or all of the Company's development and expansion plans and
expenditures, which could  limit the  ability of the  Company to  meet its  debt
service  requirements and could  have a material adverse  effect on its business
and on the value of the Common Stock. See "Risk Factors -- Substantial  Leverage
and Ability to Service Debt; Substantial Future Capital Needs."
    
 
                                       28
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
   
    The  Company designs, builds, owns and operates innovative wireless networks
capable of providing  low-cost real-time status  and event monitoring  of up  to
several  million  fixed  endpoints.  The primary  application  of  the Company's
network is to provide NMR services to electric, gas and water utility  companies
pursuant  to  long-term contracts.  The Company  is currently  building wireless
networks to provide NMR services to KCPL,  and UE in St. Louis covering a  total
of  approximately 1,220,000  meters, of which  more than 105,000  meters were in
revenue service  as of  June 30,  1996. In  addition, the  Company has  recently
entered  into separate services agreements with  NSP in Minneapolis and Puget in
Washington State, pursuant to which it has contracted to build wireless networks
to provide  NMR  services  covering  an  aggregate  of  approximately  1,015,000
additional  meters, including 1,000,000 meters  under the NSP Services Agreement
and an initial installation consisting of 15,000 meters under the Puget Services
Agreement.  CellNet  also  currently   provides  certain  network   distribution
automation  services  to  electric utility  customers  including  monitoring and
control of power  distribution equipment. CellNet's  network uses radio  devices
fitted  to existing utility meters to read and report data from each meter every
few minutes. Through efficient  use of radio  frequency spectrum, the  Company's
networks  will  have  substantial  additional  capacity  to  service non-utility
applications that require low-cost monitoring  of fixed endpoints, such as  home
security  and remote status monitoring of vending machines and office equipment.
The Company  is working  with industry  leaders in  those markets  to  encourage
further development of such applications.
    
 
   
    CellNet  was established  in 1984  and prior to  1991 it  developed and sold
non-communicating electronic meter registers with embedded memory  capabilities.
In  1991, the  Company decided  to phase  out such  activities and  focus on the
development of NMR services and related networks.
    
 
   
    CellNet believes it has a first-to-market opportunity to offer wireless data
communications  services  on  a  commercial  scale  for  utility  and   selected
non-utility  applications. CellNet's  network is distinguished  by the following
advantages:
    
 
    - infrastructure  and  operating  costs  sufficiently  low  to  permit  cost
      effective   utility  meter  reading  and   other  fixed  point  monitoring
      applications;
 
    - highly efficient  use of  spectrum --  the equivalent  of approximately  a
      single voice channel is needed to operate a network;
 
    - proprietary  software  specifically  designed  to  manage  real-time  data
      collection from up to several million endpoints; and
 
   
    - open systems architecture designed to  allow new applications to be  added
      to the CellNet system.
    
 
   
    Utilities are under increasing regulatory and competitive pressures. CellNet
offers  an  outsourced solution  which  enables utilities  to  offer time-of-use
pricing plans, peak demand monitoring, real-time response to billing  inquiries,
real-time  power  outage detection,  on-demand  meter reads,  customized billing
functions and distribution  automation. The  Company believes  its NMR  services
provide  utilities with an effective solution to  many of the demands created by
the increased regulatory and competitive pressures within the utility  industry.
CellNet's  system allows utilities to respond effectively to regulatory changes,
reduce costs, defer capital spending and enhance their operating efficiencies.
    
 
   
    The Company is actively  targeting those utilities which  operate in the  60
largest  MSAs, which represent a  majority of the 225  million electric, gas and
water meters in the United States. The Company believes that utilities operating
in these densely  populated areas  will be  the first  to experience  heightened
competitive  and  regulatory pressures,  and  as such,  will  be most  likely to
benefit from the Company's services. The Company believes that these competitive
and regulatory  pressures  have  prompted  utilities in  the  United  States  to
undertake increased measures to improve their efficiency and service levels.
    
 
    CellNet's  proprietary  technology  enables the  Company  to  make extremely
efficient use of spectrum. As a result, relative to other wireless services, the
Company   has   been    able   to    acquire   frequency   at    a   very    low
 
                                       29
<PAGE>
   
cost.  The  Company  had  capitalized  $762,000  for  license  fees  and related
acquisition expenses attributable to spectrum  acquisition costs as of June  30,
1996 and has acquired 50 spectrum licenses in 42 of the top 60 MSAs. The Company
believes  that it will be able to  obtain additional spectrum at reasonable cost
if required. The Company has focused its spectrum acquisition strategy on  these
top  60  markets.  See "Risk  Factors  --  Access to  Radio  Frequency Spectrum;
Regulation by the Federal Communications Commission."
    
 
   
    The Company believes its  spectrum-efficient networks will have  substantial
excess   capacity  to   service  non-utility   applications  requiring  low-cost
monitoring  of  fixed  endpoints.  Potential  non-utility  applications  of  the
Company's  systems include  home security,  remote status  monitoring of vending
machines, office  equipment,  parking meters  and  other equipment,  and  remote
control  of traffic lights. The Company is working with industry leaders such as
Ameritech,  Hewlett  Packard,  Honeywell,  Inc.,  Real  Time  Data,  Inc.,   and
Interactive  Technologies,  Inc.  to  develop  such  applications.  The  Company
believes that  its  utility  networks  will provide  an  excellent  platform  to
position   the  Company  as  a  leading  wholesale  provider  of  wireless  data
communications services for such non-utility applications.
    
 
   
    The Company believes that a significant international market also exists for
its services with several hundred million electric, gas and water meters outside
of the United States. The Company's strategy is to pursue international  markets
through  joint  ventures.  The  Company  is  currently  exploring  projects with
electric utilities in the U.K., Singapore and Thailand.
    
 
CHANGES IN THE ELECTRIC UTILITY INDUSTRY
 
   
    The utility industry  is in transition.  The traditional utility  structure,
consisting  of a  vertically integrated system  operating as  a natural monopoly
with rates  set  in  relation  to cost,  has  presented  utilities  with  little
incentive  to improve  service quality or  operating efficiency.  Similar to the
regulatory evolution  that has  already taken  place in  the transportation  and
telecommunications  industries,  customer  demands  and  regulatory  mandates by
Federal,  state  and  local  governments  are  forcing  utilities  to  transform
themselves   from  regulated  monopolies  into  competitive  enterprises.  While
regulatory initiatives  vary from  state to  state, many  involve a  shift  from
rate-of-return  ratemaking, in  which a  utility's rates  are determined  by its
return on assets, to  performance-based ratemaking, in  which a utility's  rates
and  profitability are based upon its  cost, efficiency and service quality. The
gas utility  industry  has  already  been  transformed.  Today,  commercial  and
industrial  customers can negotiate  to purchase gas  directly from producers or
brokers, while utilities are required to  provide transportation of such gas  to
customers' facilities.
    
 
    The  restructuring  of  the  electric  utility  industry  is  underway. This
restructuring is focused on opening  the electric power production industry,  in
certain  markets,  to full  competition in  the next  few years,  and ultimately
providing customers access to multiple  suppliers. Federal legislation, such  as
the National Energy Policy Act of 1992 (the "EP Act"), has eased restrictions on
independent  power  producers  in  an  effort  to  increase  competition  in the
wholesale electric power  generation market.  As a result,  the construction  of
cogeneration  facilities and  independent power  production facilities  has been
increasing, creating lower cost alternatives for large commercial and industrial
customers.  Further,  the  EP  Act  authorized  the  Federal  Energy  Regulatory
Commission  ("FERC") to mandate  utilities to transport  and deliver, or "wheel"
energy for the supply of bulk power to wholesale, but not retail, customers.  In
order  to facilitate  the transition to  increased competition  in the wholesale
power markets made possible by the EP Act, in March 1995 FERC issued a Notice of
Proposed Rulemaking that would require utilities to (i) establish open access to
all  wholesale  sellers  and  buyers,  (ii)  offer  power  transmission  service
comparable  to what  they provide themselves  and (iii)  take power transmission
service under the same tariffs offered to other buyers and sellers.
 
   
    The EP  Act granted  individual states  the sole  authority to  mandate  the
wheeling  of  electric power  to  retail customers.  Regulatory  and legislative
activity at the  state level  regarding retail wheeling  has recently  increased
dramatically.  California is the furthest along in implementing retail wheeling,
and pursuant to the California Public Utility Commission's plan (which is  still
subject to legislative approval), utilities will be required to offer an initial
group  of customers  the ability to  choose their electricity  supplier in 1998,
with all  customers  having  this  ability by  2003.  Regulators  in  New  York,
Massachusetts, Michigan, New Hampshire and Vermont have all ordered utilities to
file restructuring plans which would address, among other
    
 
                                       30
<PAGE>
competitive  issues, a schedule  for implementing retail  wheeling over the next
several  years.  Other  states  are   in  various  stages  of  considering   the
implementation of retail wheeling, both at legislative and regulatory levels.
 
    The  trend  from  rate-of-return towards  performance-based  ratemaking, the
movement towards retail  wheeling and  heightened competition  are leading  many
utilities to implement initiatives in the following areas:
 
    INCREASE  OPERATING EFFICIENCIES.  Utilities are seeking to reduce operating
costs through  increased  automation  and improved  information  processing.  In
particular, many utilities have focused on the inefficiencies of the traditional
once-a-month  drive-by  or walk-by  meter reading  process.  In addition  to the
direct expense of  monthly meter  reading, manual  processes create  significant
indirect   expenses.  These  include  responding  to  customer  billing  service
inquiries and  complaints, meter  reading errors,  missed meter  reads,  special
appointment  meter reads to  determine and correct errors,  and service calls to
discontinue and  to initiate  service.  Utilities are  also seeking  to  improve
detection  of energy theft, which is estimated  to cost many millions of dollars
per year.
 
   
    DEFER CAPITAL EXPENDITURES.  Utilities must build plant capacity to meet the
anticipated peak demand for energy on a daily and seasonal basis with an  excess
capacity  margin  to respond  to extraordinary  demand  peaks caused  by extreme
weather conditions.  However,  power  plant expansions  are  costly  and,  under
performance-based  ratemaking, investments in  such capacity might  not be fully
compensated by ratemaking authorities. Reducing peak demand allows utilities  to
defer  or avoid  additional plant construction  or costly  peak power generation
with standby power  generating facilities. Unlike  phone companies, which  offer
time-of-use  rates to discourage consumption  during peak periods, utilities are
currently unable  to  implement time-of-use  plans  for any  but  their  largest
customers due to inadequate real-time information about customer power usage.
    
 
    IMPROVE   SERVICE  QUALITY.    In   response  to  the  emerging  competitive
environment, utilities are seeking to  improve and differentiate their  services
by  offering their customers  different billing plans, remote  move in/ move out
meter  reading,  multi-location  bill  aggregation  and  other  innovations.  In
addition,  utilities are seeking to respond to regulatory and public pressure to
improve their ability to detect and respond to power outages.
 
   
    To implement  time-of-use pricing  and  other sophisticated  pricing  plans,
retail  wheeling,  real-time  power  outage  detection  and  the  other services
described above, electric utilities will  require extremely accurate and  timely
data  regarding  energy consumption  by  customers. However,  adequate automated
systems have not been  available. Some utilities  have simplified and  automated
the  manual  meter  reading process  to  a  limited degree  through  the  use of
hand-held  and  drive-by  meter  reading  equipment,  commonly  referred  to  as
automated  meter reading ("AMR"). An AMR device  polls meters on a meter reading
route, usually on a monthly basis, and the consumption data is then  transmitted
to  the  utility's  information  system.  Periodic  meter  readings,  even  when
"automated" by such equipment,  do not provide the  necessary data to  implement
these regulatory and competitive initiatives.
    
 
THE CELLNET SOLUTION
 
   
    CellNet  has designed, developed and is  now commercially deploying in scale
the first wireless data communications  network designed to provide  high-volume
real-time  status and event monitoring of up to several million endpoints. Since
the primary application of the network is to provide NMR services to  utilities,
the  network has been designed to meet the utility industry's cost requirements,
information needs  and rigorous  design specifications.  CellNet's network  uses
radio  transmitters fitted to existing meters to  read and report data from each
meter every few minutes. CellNet uses inexpensive radio devices and  proprietary
software  in  its  networks,  deploys certain  network  components  primarily on
utility power  poles, and  requires minimal  frequency spectrum  to operate  its
system.  As a result, the Company believes that for large scale installations it
will be able to provide basic NMR services at a cost to the utility of less than
$1 per month per meter.
    
 
                                       31
<PAGE>
    CellNet's system  enables  utilities  to better  serve  their  customers  by
offering enhanced services such as:
 
    - time-of-use and demand energy rates;
 
    - real-time response to billing inquiries;
 
    - real-time power outage detection, location and notification;
 
    - remote verification of "power on" and outage restoration;
 
    - on-demand meter reads;
 
    - customer-selected billing dates and consolidated, multi-location billing;
 
    - automatic move in/move out meter reading;
 
    - distribution automation; and
 
   
    - access  for utility customers to consumption, rate and billing information
      via the Internet.
    
 
    In addition, CellNet's  system allows  utilities to  respond effectively  to
regulatory  changes,  reduce costs,  defer  capital spending  and  enhance their
operating efficiencies, thereby deriving benefits in the following areas:
 
   
    RESPOND EFFECTIVELY  TO  REGULATORY  INITIATIVES.   If  retail  wheeling  is
adopted,  consumers  will  contract  to  buy  electricity  from  specific  power
providers, but all  such power providers  will supply electricity  to the  local
electrical  network, which will then distribute  power to all consumers. Monthly
meter reading allows power  providers to determine aggregate  usage, but not  to
determine  time of use, a critical  requirement to implement retail wheeling. By
providing real-time  data  on  each  consumer's  power  usage,  CellNet  enables
utilities  to effectively implement  retail wheeling and  avoid the installation
across their territories of individual time-of-use meters, which could cost more
than $150-$200 at each service endpoint.
    
 
    REDUCE CAPITAL INVESTMENTS.  CellNet's NMR services will enable utilities to
adopt time-of-use billing  plans, which  can be  used to  motivate consumers  to
shift  discretionary consumption to  off-peak periods. Reducing  peak demand may
enable utilities to defer  or avoid costly plant  construction. In addition,  by
contracting  with  CellNet  to  build and  maintain  the  wireless  network, the
utilities avoid both the technological risk and capital outlay of developing and
deploying NMR systems.
 
   
    REDUCE  OPERATING  COSTS  AND  ENHANCE  OPERATING  EFFICIENCIES.     Through
automation, CellNet's wireless data network helps utilities to reduce the direct
and  indirect operating costs associated with manual meter reading. In addition,
CellNet's network  enables distribution  automation capabilities  which  include
monitoring  and control of power distribution equipment as well as meters. Using
the CellNet  network, utilities  can  manage many  aspects  of the  delivery  of
electricity,  including the ability to detect power outages, monitor and control
circuit breakers, monitor the load on transformers, control circuits to  isolate
faults  on feeder power lines, and switch automatically among capacitor banks to
produce constant voltage levels. As a  result, problems may be detected  earlier
and  solved more quickly, operations may become more reliable and service fleets
may be more efficiently deployed and  dispatched as outages can be more  readily
pinpointed within the utility's service territory. Such capabilities also enable
a utility to reduce energy theft through quick detection of meter tampering.
    
 
   
    RESPOND  TO COMPETITIVE PRESSURES.   CellNet's networks  enable utilities to
profile their customers' power  usage and to  enhance and differentiate  service
offerings  through  innovative billing  plans and  other programs.  In addition,
utilities may elect to provide  non-utility services connected with the  CellNet
network,  as such services are developed.  These services could enable utilities
to obtain  new  revenue sources  and,  through bundling  of  such  applications,
further differentiate their services.
    
 
BUSINESS STRATEGY
 
    The  Company  intends  to  deploy  and operate  a  series  of  wireless data
communications networks  pursuant to  long-term contracts  with utility  company
customers  and  to earn  recurring  revenues by  providing  NMR services  to the
utilities and  by  using  the  network  to  support  a  variety  of  non-utility
applications.
 
                                       32
<PAGE>
Principal  elements of CellNet's  strategy are to (i)  focus on utility markets,
(ii) promote  development  of  non-utility applications,  (iii)  form  strategic
alliances,  (iv) pursue international expansion  and (v) outsource a substantial
portion of its manufacturing and installation activities.
 
    FOCUS ON UTILITY MARKETS
 
   
    The Company is initially targeting those  utilities which operate in the  60
largest  MSAs, which represent a  majority of the 225  million electric, gas and
water meters in the United States. The Company believes that utilities operating
in these densely  populated areas  will be  the first  to experience  heightened
competitive  and regulatory pressures, and as  such, will have the greatest need
to adopt  NMR.  These  MSAs  also  offer  the  greatest  potential  markets  for
non-utility  applications.  The  Company  is  also  pursuing  selected utilities
outside of the top 60 MSAs.
    
 
    PROMOTE DEVELOPMENT OF NON-UTILITY APPLICATIONS
 
   
    Through the efficient use of spectrum, each CellNet network will have excess
capacity after  serving  all of  a  utility's NMR  and  distribution  automation
requirements.  The Company  will seek  to use  its networks'  excess capacity to
support non-utility  services that  would  benefit from  the availability  of  a
low-cost  wireless  network and  that would  be  offered by  CellNet's corporate
clients, including a  utility or  its affiliates.  The Company  is working  with
leading  manufacturers  and  application  developers  in  order  to  promote the
development of  products and  services capable  of using  the CellNet  networks.
Potential applications include the following:
    
 
    - security  services  for  home  security, fire  alarm  and  personal safety
      devices;
 
    - remote status  monitoring  for  vending, postage,  change  and  commercial
      washing  machines,  office  and factory  equipment,  and  intelligent home
      devices, such as remote control thermostats; and
 
    - intelligent transportation systems for traffic lights, parking meters  and
      toll booths.
 
   
    The  Company  believes  that its  low  monthly network  service  prices will
substantially  increase  the  likelihood   of  market  acceptance  of   existing
applications  and  enable  potential new  applications.  Wireless  home security
systems are an  example of an  existing application that  might achieve  greater
market  penetration  if equipment  and  service costs  were  reduced by  using a
CellNet network.  CellNet  is working  with  Interactive Technologies,  Inc.,  a
leading  provider of  wireless home security  systems, to  develop an affordable
security system that  would communicate  over a  CellNet network.  Additionally,
remote  monitoring of  vending machines would  substantially reduce  the cost of
servicing those machines. Real Time Data,  Inc. ("RTD") has developed a  vending
machine  monitoring device which tracks product sales and inventory. RTD and the
Company have been working together to integrate RTD's devices with the Company's
networks and expect to begin commercial trials within twelve months.
    
 
    FORM STRATEGIC ALLIANCES
 
   
    The Company  is  forming  strategic alliances  with  leading  companies  and
certain   utilities  to   promote  the   development  and   joint  marketing  of
complementary products or services for utility applications and the  development
of  non-utility applications whose traffic would be carried on CellNet networks.
CellNet is currently working with the following leading companies.
    
 
   
    AMERITECH AND WISCONSIN ELECTRIC POWER COMPANY.  The Company is working with
Ameritech and its partner, Wisconsin Electric Power Company, on the  development
and  joint marketing of a high-end, two-way, in-home terminal for remote control
of home security, lighting, environmental and other home systems.
    
 
   
    GENERAL ELECTRIC COMPANY  ("GE").  GE  and the Company  have entered into  a
non-binding  memorandum of understanding ("MOU") to jointly market to utilities,
on a non-exclusive basis, automated NMR solutions that incorporate both parties'
products. GE has installed  CellNet radio devices  on new GE  meters on a  trial
basis.
    
 
    HEWLETT-PACKARD  ("HP").   The Company  and HP  are working  on a  number of
projects for  cooperative  marketing of  utility  applications such  as  systems
integration, data storage, transformer load analysis, energy
 
                                       33
<PAGE>
   
theft  analysis, power quality measurement, and equipment and status monitoring.
This non-exclusive relationship,  pursuant to  a non-binding  MOU, provides  for
joint marketing, technology exchange and joint proposals to utilities.
    
 
   
    HONEYWELL,  INC.   Honeywell  has entered  into a  non-binding MOU  with the
Company relating to the creation of "smart communicating thermostats" that would
serve as the key elements in a home-based energy management system. The  parties
also  plan to collaborate on identifying  other in-home automation products that
could leverage Honeywell's extensive line of environmental control products with
CellNet's wireless technology.
    
 
   
    INTERACTIVE TECHNOLOGIES, INC.  ("ITI").   The Company has  entered into  an
agreement with ITI, a leading provider of wireless, in-home security systems, to
develop  moderately-priced  security systems  based  on ITI's  existing security
devices and CellNet's wireless technology.
    
 
   
    RTD.   As  described above,  RTD,  a  developer of  remote  vending  machine
monitoring  systems, has entered into an agreement with the Company to integrate
its vending  machine  monitoring  system with  the  Company's  wireless  network
technology.
    
 
   
    CONNEXT,  INC. ("CONNEXT").  The Company  has entered into a joint marketing
agreement with  ConnexT,  a subsidiary  of  Puget which  provides  network-based
application  services to utility companies, whereby  the parties agree to assist
each  other  in  marketing  their  respective  products  and  services  to  both
companies' existing and prospective utility customers.
    
 
    PURSUE INTERNATIONAL EXPANSION
 
   
    With  several hundred million  utility meters located  outside of the United
States and with comparable opportunities to  use the CellNet system for  utility
and  non-utility  applications,  the  international  market  offers  significant
additional opportunities for  the Company. Although  it has concentrated  almost
all  of  its efforts  to  date on  the domestic  market,  the Company  has begun
exploring international market opportunities. The Company has undertaken limited
market investigations in a number of countries including the U.K., Singapore and
Thailand, and continues to receive numerous inquiries from utilities and  others
expressing  interest  in the  deployment of  the CellNet  system outside  of the
United States. The Company's strategy is  to pursue these markets through  joint
ventures  with  local utilities  and other  partners  that would  facilitate the
adoption  of   CellNet's   system.  In   considering   international   expansion
opportunities for its system, the Company expects that its targeted markets will
be characterized by (i) a well-developed utility infrastructure, (ii) demand for
low-cost  monitoring, (iii) a progressive  regulatory climate favoring increased
efficiency, customer service and  competitive access and (iv)  well-capitalized,
established and reliable local partners.
    
 
    The  Company's  principal international  activity to  date  has been  in the
United Kingdom, where deregulation  and privatization initiatives have  resulted
in  open market competition in a pattern  which may be duplicated elsewhere. The
Company believes that the CellNet  system can be adapted  for use in the  United
Kingdom  with appropriate modifications to the  system's radio devices and other
system equipment. The Company  is seeking to obtain  spectrum licenses with  the
assistance  of local  regional electric companies  ("RECs") and  others, and has
initiated discussions with  a number  of RECs for  the deployment  of pilot  and
full-scale NMR systems.
 
   
    Singapore  and Thailand are estimated to  have approximately 3.0 million and
8.0 million existing utility  meters (of which 2.0  million are in  metropolitan
Bangkok),  respectively.  The  Company  has  had  preliminary  discussions  with
utilities and potential local partners to enter into NMR services agreements  in
these markets.
    
 
    OUTSOURCE SUBSTANTIAL MANUFACTURING AND INSTALLATION ACTIVITIES
 
   
    The  Company  outsources  a  substantial portion  of  its  manufacturing and
installation  activities.  As   a  result,  CellNet   leverages  the  size   and
capabilities  of key suppliers  to take advantage  of manufacturing economies of
scale, reduce  component pricing  through bulk  purchasing, and  have access  to
manufacturing   capacity  and  resources  to  meet  highly  variable  production
requirements. The Company will retain overall
    
 
                                       34
<PAGE>
   
network construction responsibility, but intends to rely on local subcontractors
for installation,  primarily  those who  have  long working  relationships  with
CellNet's  utility customers. The Company believes that outsourcing installation
activities will reduce the start-up time  and the Company's investment risk  for
each project.
    
 
WIRELESS COMMUNICATIONS INDUSTRY OVERVIEW
 
    CellNet operates within the wireless communications industry, which includes
personal  communications  services  ("PCS"), specialized  mobile  radio ("SMR"),
microwave, cellular (including cellular digital  packet data ("CDPD") ),  paging
and  multiple  address  radio system  ("MAS")  segments, among  others.  The two
principal categories  of commercial  wireless applications  are voice  and  data
transmission.  Within those broad categories,  service requirements for specific
applications vary substantially in terms of quality, speed, capacity,  mobility,
two-way  capability, geographical coverage and  cost. In general, products which
provide for greater mobility and capacity are more expensive. As a  consequence,
the  market  for  wireless  services  is  segmented,  matching  specific service
requirements with the  most suitable  wireless technology.  The following  chart
illustrates the relative positioning of these applications.
 
                                  [CHART]
 
[Graphical  representation  of the  relative  positions of  segments  within the
wireless communications industry based upon two parameters: (i) relative network
capacity to handle  data, voice and  video applications and  (ii) relative  user
device  mobility ranging from  fixed to mobile. The  chart suggests that monthly
endpoint  cost  increases  with  increasing  network  capacity  and  user/device
mobility.]
 
   
    CellNet's  system is  designed to utilize  small amounts of  spectrum and to
provide low-cost,  high-volume, real-time  monitoring  of fixed  endpoints.  The
Company  believes other  telecommunications applications or  market segments are
not as well suited  for use in  NMR and similar  applications except in  limited
cases  such as high-use  industrial metering, where  the increased equipment and
service costs  might be  justified by  high rates  of power  consumption, or  in
certain  rural applications, where the cost  of installing and operating a fixed
network on a per meter basis might be higher. Competing service applications are
therefore expected  to  develop  largely  within the  segment  of  the  wireless
communications market in which CellNet now operates.
    
 
                                       35
<PAGE>
   
    CellNet's  network architecture and the nature of the markets that it serves
differ significantly from traditional  cellular companies, thereby resulting  in
potential advantages for CellNet in providing NMR services which include:
    
 
   
    LOWER  MARKET ADOPTION  RISK.  CellNet  will only construct  a network after
entering into  a long-term  relationship  with a  utility  or other  client.  It
therefore  does not need to finance  construction of networks in anticipation of
obtaining customers.
    
 
   
    LOWER CHURN/PENETRATION RATE.  Unlike the customer bases for other wireless,
voice and  data  service  providers  where customers  can  easily  switch  to  a
competitive  provider, CellNet's subscriber endpoints do not experience frequent
change or "churn" and the Company gains 100% penetration within each  contracted
market.  The marketing and administrative costs typically associated with churn,
and the  capital  risk associated  with  variable penetration  rates,  are  thus
eliminated.  Further,  due  to  inflation escalation  clauses  in  the Company's
services agreements, the  Company believes  that the  value of  its revenue  per
endpoint in real terms will likely be maintained over time.
    
 
   
    HIGHER  CUSTOMER  CREDIT QUALITY.    CellNet receives  its  contract service
revenue directly from utilities  rather than from  individual subscribers. As  a
result,  the Company  experiences less credit  risk and  generally lower billing
expenses than other wireless communication providers.
    
 
   
    MORE EFFICIENT  DEPLOYMENT.   Cellular  and PCS  cell sites  are  frequently
costly  and can be difficult to obtain. The modularity of the CellNet system and
the efficient  size  of  its components  facilitate  inexpensive  deployment  of
scalable  networks. The Company's system components have been designed to fit on
utility power poles or,  where necessary, on buildings  or other structures.  As
the  electric utility  is its  primary customer,  CellNet has  access to utility
poles,  transmission  towers,  and  various  properties  for  deployment.  Radio
devices, which represent the bulk of network components, are simply "plugged in"
as newly retrofitted meters to replace an existing meter. The Company's MCCs and
CellMasters  (as defined  below) typically  take two  to five  hours to install,
providing a network which can be deployed swiftly and efficiently. The system is
also scalable, thereby allowing coverage regardless  of the size of the  utility
service area.
    
 
   
    MORE  EFFICIENT SYSTEM DESIGN.  Cellular telephone networks are designed for
peak usage, with a large percentage of the network underutilized for much of the
day. The CellNet  network gathers  information from  its endpoints  consistently
around  the  clock and  therefore  does not  encounter  the peak  usage problems
typically experienced by cellular phone service providers.
    
 
    LOWER FREQUENCY COSTS.   Cellular,  PCS and other  two-way wireless  systems
typically require a large amount of spectrum which can be very costly to obtain.
Because  the Company is able  to utilize a small amount  of frequency for a wide
metropolitan area  (the  equivalent of  approximately  a single  cellular  voice
channel),  it is not subject to  the substantial frequency costs associated with
wireless communications companies.
 
TECHNOLOGY
 
   
    CellNet's NMR system  has been  developed specifically  to offer  real-time,
low-cost,  high  volume  wireless data  communications  services.  Such services
require (i) inexpensive  endpoint devices, (ii)  the ability to  support a  wide
range of applications, (iii) reliable, consistent service over a wide area, (iv)
the  capacity  to handle  simultaneous transmission  and  processing of  a large
volume of data, (v) integrated communications and applications support software,
and (vi) efficient use of bandwidth to minimize spectrum acquisition costs.
    
 
    To meet these cost  and data handling requirements,  CellNet has designed  a
system  which uses a two-tiered wireless  network hierarchy managed by a central
system control center  which collects, concentrates,  forwards and manages  data
from  many  fixed  endpoints.  The  elements  of  this  communications hierarchy
include:
 
    - endpoint devices which transmit  data relating to  the equipment they  are
      monitoring or controlling such as utility meters;
 
                                       36
<PAGE>
    - MicroCell  Controllers ("MCCs") which manage the endpoint devices in their
      local coverage area (as part of a  local area network or "LAN") and  which
      collect and process data transmissions from such endpoint devices;
 
    - CellMasters  which gather data  from MCCs located in  a wide coverage area
      (as part of a wide area network or "WAN") and which communicate that  data
      to a central System Controller; and
 
    - a  System Controller  which manages  the entire  network and  operates the
      application gateways for integration with the client's own data systems.
 
                                  [CHART]
 
[Schematic  diagram   of   CellNet's  wireless   data   communications   system,
illustrating the heirarchy from endpoint radio devices to System Controllers.]
 
   
    ENDPOINT DEVICES.  The subscriber unit of the CellNet system is a relatively
inexpensive  low-power  radio  device which  is  attached to  a  stationary data
source, such as a utility meter, to  collect and transmit information to an  MCC
and  typically includes a transceiver or  transmitter. The Company has developed
endpoint devices for electric utility  applications which may be retrofitted  to
each  of the four major types of utility meters presently being used by electric
utilities in the United States. These endpoint devices currently collect time of
use, customer demand and load profile  data from an electric meter and  transmit
such  information to the local  area MCC once every  few minutes. Electric meter
endpoints  are  also  able  to  transmit  "distress  signals"  indicating  meter
tampering  or power outages. The Company is also developing endpoint devices for
gas and water meters, which it expects to introduce by the end of 1996 and 1997,
respectively, and  two-way  radio devices  for  advanced NMR  applications.  The
Company  is also working  with industry leaders to  develop endpoint devices for
non-utility  applications.  See   "--  Business  Strategy   --  Form   Strategic
Alliances."
    
 
   
    MICROCELL  CONTROLLERS.  An  MCC is a  device which is  mounted on a utility
pole or other fixed location in the center of a microcell and which routes  data
from  all of the endpoints  in the microcell to the  CellMaster via the WAN. The
number of endpoint  devices in each  microcell depends on  a number of  factors,
including  topography and  population density. In  addition to  functioning as a
router, the MCC is an intelligent node in the distributed control system and has
a powerful  microprocessor which  enables  it to  perform data  storage,  packet
routing  and voltage  and power  outage monitoring  for endpoint  devices in its
microcell area. Each
    
 
                                       37
<PAGE>
   
MCC also has extensive network management capabilities which permit new endpoint
devices to be added automatically without interfering with the handling of  data
from  existing  endpoints.  This architecture  allows  CellNet  to significantly
reduce the cost of the endpoint  device itself and increases the potential  data
throughput  of an entire network, as most of the intelligence is provided at the
MCC level. The MCC  communicates with the endpoint  devices in its microcell  in
the 902-928 mHz band, which is an unlicensed portion of spectrum.
    
 
   
    CELLMASTERS.   A CellMaster generally communicates  with anywhere from 50 to
200 MCCs over an area typically covering 20-75 square miles (2.5-5-mile radius).
Each CellMaster incorporates network  management software which manages  traffic
scheduling,  radio frequency  power controls and  signal monitoring. CellMasters
are built with fully  redundant hardware, are  ruggedly constructed for  extreme
weather, and can perform automatic switchovers between system components in case
of  failure.  The  WANs covering  specific  utility customer  service  areas are
composed of a  number of CellMaster  units. A CellMaster  communicates with  the
MCCs  using a radio link in the 928/952 mHz band, which is a licensed portion of
spectrum.
    
 
    RTUS.   Remote Terminal  Units  ("RTUs") monitor  and operate  equipment  at
specific points in a utility's distribution system. CellNet integrates a two-way
radio  device into  RTU equipment manufactured  for a utility  by other parties,
which enables remote  operation of these  RTUs. By providing  a means of  remote
monitoring  and controlling  of power  distribution equipment,  CellNet's system
enables utilities to monitor and control  circuit breakers, monitor the load  on
transformers,  control circuits  to isolate  faults on  feeder power  lines, and
switch automatically among capacitor banks to provide constant voltage levels.
 
   
    SYSTEM CONTROLLERS.    The System  Controller  provides the  link  from  the
CellMasters  to the  client's corporate data  network and serves  as the network
management platform. The System Controller  consists of a cluster of  UNIX-based
workstations  operating over a  network using standard  TCP/IP protocols. Such a
configuration is  extremely scaleable  as  it can  be  expanded to  meet  system
requirements  simply by  adding additional  workstations. The  System Controller
supports a variety of radio-based and leased line data links to each  CellMaster
in  the network. These links  are redundant for added  reliability. At the local
systems operations center, the System Controller provides customized gateways to
existing client data  systems. The System  Controller enables CellNet's  on-site
system  operator,  who manages  the network  for  CellNet's utility  clients, to
manage  traffic,  monitor   performance  and  configure   network  devices.   As
non-utility  applications  are deployed,  the  Company may  integrate additional
server devices to manage such non-utility applications at the System  Controller
level.
    
 
    CellNet's  MCC and CellMasters are equipped with back-up batteries and power
supply.  CellNet's  System  Controllers   also  have  available  back-up   power
capability.
 
   
    The  Company also operates  the CellNet Central  Operations Room ("CCOR") at
its San Carlos, California facilities which monitors performance of all regional
System Controllers and is able to assume operations of the regional networks  if
the  local  System  Controller experiences  a  failure. The  Company  operates a
private national data  network to  link these regional  sites using  third-party
carrier services.
    
 
    SYSTEM SOFTWARE.  CellNet believes that one of its key enabling technologies
is  the software which facilitates operation  of a large-scale NMR system. While
certain  "off-the-shelf"  networking   approaches  work  well   in  a   wireline
environment with expensive computers and workstations, the ability to operate in
a  wireless environment  under extreme conditions  at low cost  has required the
development of a sophisticated network architecture. CellNet's network  solution
is  based  on  distributed  computing and  messaging  technologies  which enable
intelligence to  be decentralized  and  ensure efficient  use of  spectrum.  The
CellNet  Network Operating System ("NOS") is  a proprietary system that provides
sophisticated network communication services  between the System Controller  and
the  CellMaster units, RTUs, MCCs and endpoint devices. It is a scaleable system
that has been specifically designed  to ultimately handle millions of  endpoints
in  a  single  regional  network.  Extensive  real-time  diagnostic  and network
management features  manage  traffic,  monitor  system  performance  and  enable
network  configuration as data is collected  and delivered to users. The CellNet
NOS is able to maintain fast response times and system capacity by  distributing
a significant portion of the network's computing power at the MCC level.
 
                                       38
<PAGE>
   
    The NOS offers the benefits of incrementally adding processing power as well
as  supporting remote operations required  for redundancy and backup operations.
As such,  an entire  regional system  can be  switched quickly  from one  System
Controller  to another in the event of failure.  The CellNet NOS is also able to
segregate network data from multiple  non-utility applications and provide  such
data  to non-utility clients  over additional database  interfaces. Each CellNet
system  is  customized  with  application-specific  gateways  which  enable  the
interface between the System Controller and the client's existing corporate data
systems.  CellNet has  delivered gateways to  support the  data requirements for
billing automation,  electric  distribution automation,  customer  service  call
center automation and load management programs. The flexibility provided by this
NOS  architecture  will  enable  the  system  to  offer  services  for  many new
applications unrelated  to  NMR services  such  as distribution  automation  and
non-utility  applications.  By  building  on a  general  network  capability the
Company can extend its services to  many other utility and non-utility  services
without   incurring   significant   costs   of   re-designing   the   underlying
communications architecture. Each new application  is expected to be added  with
only   incremental   development,   which   will   be   focused   primarily   on
application-specific endpoint devices  and system  gateways. Furthermore,  since
its  design is independent  of the specific endpoint  radio devices, the Company
believes that this  architecture can  evolve to incorporate  future advances  in
wireline  and  wireless  communications.  The  Company  has  made  a substantial
commitment to establishing a strong  competitive position, having invested  over
240 staff-years in the design, development and testing of its system.
    
 
    EFFICIENT  SPECTRUM UTILIZATION.  CellNet's  network components utilize both
licensed and unlicensed radio frequency bands.  The CellNet WAN operates in  the
928/952  mHz frequencies which are licensed by the FCC in 25 or 12.5 kHz channel
bandwidths for full duplex operation and point-multipoint data services. CellNet
has developed a proprietary technology,  subject to issued and pending  patents,
which  permits a narrowband radio system to  derive 10 subchannels from a single
25 kHz channel.  By reusing  subchannels in  a manner  similar to  that used  by
cellular  phone systems, CellNet believes it can  grow a system to cover a large
region and expand capacity incrementally as needed. As a result, CellNet is able
to operate its wide area networks in the spectral equivalent of approximately  a
single voice channel. CellNet has obtained 50 spectrum licenses in 44 of the top
60  MSAs and  believes that  it will  be able  to obtain  additional spectrum as
required.
 
MANUFACTURING AND OPERATIONS
 
   
    The Company currently outsources  the manufacture and  assembly of its  high
volume,  low cost equipment such as  endpoint radio devices. For instance, Jabil
Circuit Inc. ("Jabil"), one of  the largest electronic equipment  subcontractors
in  the United States, is assembling  endpoint radio devices for electric meters
for the  Company.  CellNet's  supply  strategy  is  to  leverage  the  size  and
production  capabilities of Jabil  and other key suppliers  to take advantage of
manufacturing  economies  of  scale,  reduce  component  pricing  through   bulk
purchasing  and obtain  access to manufacturing  capacity and  resources to meet
highly variable production requirements.
    
 
   
    CellNet presently focuses  its limited internal  manufacturing resources  on
final  assembly  and  testing  of  its  lower  volume,  more  complex equipment,
including System  Controllers, CellMasters  and  MCCs. CellNet  assembles  these
network  components, then  custom configures and  tests such  components to meet
stringent utility industry field equipment  standards. Samples of all  products,
whether   internally  or  externally  built,   are  thermally  and  electrically
stress-tested to measure product quality and reliability. Test results are  used
both  to  monitor production  quality and  to  provide information  to CellNet's
development organization for further design enhancements.
    
 
   
    CellNet has developed and is  continuing to improve a high-volume,  low-cost
process  to retrofit electric utility meters with endpoint radio devices without
causing a  meaningful  disruption  of  service to  a  utility's  customers.  The
Company's  proprietary  system  for  retrofit  information  management  analyzes
operating data, generates  reports, and provides  this information to  utilities
for  inclusion in their  databases. The Company installs  its endpoint radios on
both new and previously installed electric meters at its retrofit facilities  in
    
 
                                       39
<PAGE>
Kansas  City,  Missouri.  The  Company expects  that  similar  regional retrofit
centers  will  be  established  as  needed  to  meet  the  network  installation
requirements  under new services agreements  with utilities, although a retrofit
center can support more than one network deployment.
 
   
    The Company's  reliance on  third-party manufacturers,  including  currently
single  manufacturers for radio devices and for printed circuit boards, involves
a number of additional risks, including  the absence of guaranteed capacity  and
reduced  control over  delivery schedules, quality  assurance, production yields
and  costs.  The  Company  relies  on  sole  and  limited  source  vendors   and
subcontractors  for certain subassemblies and  components which involves certain
risks, including the possibility of shortages and reduced control over  delivery
schedules,  manufacturing  capability, quality  and cost.  See "Risk  Factors --
Dependence on Third-Party Manufacturers; Exposure to Component Shortages."
    
 
SYSTEM DEPLOYMENT AND OPERATION
 
    For  each   of  its   network  deployments,   the  Company   provides   full
implementation services to its clients, including system design, site selection,
frequency  licensing,  equipment  installation,  software  modification, systems
integration and project management.
 
   
    The modular  design of  the CellNet  system and  the efficient  size of  its
components  facilitate inexpensive deployment of  scalable networks. Most of the
system components have  been designed to  fit on utility  power poles or,  where
necessary,  on buildings  or other  structures. The  majority of  the network is
simply "plugged in" as the newly retrofitted meters replace existing meters. The
MCCs and CellMasters take typically two to five hours each to install, providing
a network which  can be  deployed swiftly and  efficiently. The  system is  also
scalable,  thereby  allowing adequate  coverage regardless  of  the size  of the
utility service area.
    
 
   
    Field engineering teams are responsible for the installation and  deployment
of  all of  the Company's  networks. Once a  services contract  has been signed,
CellNet places  a local  project  manager in  charge  of the  installation.  The
project  manager  hires  local personnel,  coordinates  activities  with various
departments within  the  utility, and  draws  on CellNet's  corporate  staff  to
perform  specialized services. CellNet's  corporate staff is  responsible for RF
network design, system software installation and integration, training of  local
systems administration personnel, FCC licensing requirements, and remote systems
monitoring.  CellNet's local  personnel are  responsible for  RF engineering and
site testing, site selection,  routine software administration and  maintenance,
selection  and training  of subcontractors, coordination  of meter retrofitting,
materials handling,  and  office administration.  During  the two  to  four-year
installation  phase of each project, local personnel for the project employed by
CellNet numbers from five to nine people, depending on the size and  anticipated
speed of each deployment. Meter changeout and system equipment installations are
generally carried out by subcontractors.
    
 
   
    Following  system deployment, a system management team of typically eight to
ten CellNet personnel (for deployments the size  of KCPL and UE) will remain  on
site  for  the duration  of  the contract  to  handle day-to-day  operations and
routine utility requests. This group will be supported by CellNet's headquarters
or regional offices, if any, that  will provide 24 hour troubleshooting  support
as  well as  additional technical  expertise that  can be  quickly dispatched if
needed.
    
 
   
    The Company also intends to provide substantial customer support,  including
on-going  field  support  and  critical  centralized  network  support functions
through regional network  control centers. Currently,  the Company is  providing
sophisticated   network  monitoring   from  its  headquarters   in  San  Carlos,
California.
    
 
CURRENT UTILITY SERVICES AGREEMENTS
 
   
    KANSAS CITY POWER & LIGHT COMPANY.   In August 1994, CellNet entered into  a
Utility  Services Agreement  with KCPL (the  "KCPL Services  Agreement") for the
provision of NMR  and other data  communications services over  a network to  be
built,  installed and  operated by CellNet.  KCPL is paying  CellNet for certain
installation costs  based upon  the  number of  meters  in revenue  service  and
monthly service fees based on the number of meters in service being used to bill
customers.  The  KCPL  Services Agreement  covers  approximately  420,000 meters
within KCPL's service  territory. CellNet  is obligated to  provide certain  NMR
services, including basic meter reading, time-of-use, demand, connect/disconnect
(move  in/move out), load profile  and real-time reading, as  well as outage and
tampering notification and certain other distribution
    
 
                                       40
<PAGE>
   
automation services. CellNet  retains ownership  of its network  system and  all
related  equipment. KCPL retains ownership of  its meters, RTUs and all metering
and other  data collected  from  KCPL's equipment.  Upon the  third  anniversary
following  complete  deployment of  the  system, KCPL  will  have the  option to
purchase from CellNet the radio transmitters and transceivers attached to KCPL's
meters and RTUs at prices  intended to allow CellNet  to fully recover its  then
unamortized  endpoint  costs (meter  and RTU  radio  device), based  upon agreed
prices for such equipment.
    
 
   
    The term of the KCPL Services Agreement  is 20 years. KCPL has the right  to
terminate  the KCPL Services  Agreement on its  eighth, eleventh, fourteenth and
seventeenth anniversary, subject to six-months  prior written notice and to  the
making  of specified termination  payments intended to  allow CellNet to recover
its then unamortized  endpoint costs (meter  and radio RTU  device), based  upon
agreed  prices for  such equipment.  KCPL can  also terminate  the KCPL Services
Agreement for  cause  in the  event  of a  material  and continuing  failure  on
CellNet's  part to meet  agreed NMR performance standards  on a consistent basis
over agreed time periods,  subject to certain rights  to cure any such  failure.
CellNet  is  entitled to  install and  operate its  network equipment  on KCPL's
property under joint use arrangements. The cost of obtaining any necessary third
party installation sites will be shared equally by the parties. CellNet may  use
the  network to provide services to third parties both during and after the term
of the KCPL Services Agreement.
    
 
   
    UNION ELECTRIC COMPANY.   In  August 1995,  CellNet entered  into a  Utility
Services  Agreement with UE  (the "UE Services Agreement")  for the provision of
data communications services over the Company's network for all electric  meters
within  defined limits of UE's service area in the city of St. Louis and certain
surrounding counties. UE is  paying CellNet for  certain installation costs  and
monthly  service fees based on  the number of installed  meters and RTUs. The UE
Services Agreement now covers approximately 800,000 electric meters within  such
territory. CellNet is obligated to provide certain NMR services, including basic
meter   reading,  demand,  load  profile,  connect/disconnect,  time-of-use  and
real-time reading, as well as outage and other notification services. During the
term of the UE Services Agreement, UE has the option to acquire certain gas  NMR
services  from CellNet and  receive an expanded scope  of electric NMR services.
CellNet retains ownership of  its network system and  all related equipment.  UE
retains  ownership of its meters, RTUs and all metering and other data collected
from UE's equipment.
    
 
   
    CellNet is  entitled  to install  its  network equipment  on  UE's  property
without  cost provided the use of such sites is exclusively for the provision of
services to UE. The cost  of obtaining any necessary  third party sites will  be
shared  equally by the parties. CellNet may  use the network to provide services
to third parties  for a  period of  30 years  subject to  the payment  to UE  of
reasonable  rental rates. The term of the UE Services Agreement is 20 years with
an option on UE's  part to extend  it for two additional  periods of five  years
each  on  substantially similar  terms. UE  has  the right  to terminate  the UE
Services Agreement on its seventh,  twelfth and seventeenth anniversary  subject
to  six-months prior written  notice and to the  making of specified termination
payments intended  to allow  CellNet to  recover its  then unamortized  endpoint
costs (meter and radio RTU devices) based upon agreed prices for such equipment.
UE  can also  terminate the UE  Services Agreement for  cause in the  event of a
material and continuing failure on CellNet's part to meet agreed NMR performance
standards on a  consistent basis over  agreed time periods,  subject to  certain
rights to cure any such failure.
    
 
   
    NORTHERN  STATES  POWER COMPANY.   In  August 1996,  CellNet entered  into a
Utility Services  Agreement (the  "NSP  Services Agreement")  with NSP  for  the
provision  of data communications services over a network to be built, installed
and operated by CellNet. NSP will pay CellNet a monthly service fee based on the
number of meters in service then being used to bill customers. The NSP  Services
Agreement  covers approximately 1.0 million gas and electric meters within NSP's
service territory  located in  the  Minneapolis -  St. Paul  metropolitan  area.
CellNet  is  obligated  to  provide certain  automated  meter  reading services,
including basic  meter reading,  time-of-use, demand,  connect/disconnect  (move
in/move  out),  load  profile  and  real-time reading,  as  well  as  outage and
tampering notification  and  certain  other  distribution  automation  services.
CellNet  retains ownership of its network  system and all related equipment. NSP
retains ownership of its RTUs, meters and all metering and other data  collected
from NSP's equipment.
    
 
                                       41
<PAGE>
   
    The  term of the NSP Services Agreement is 15 years, with a five year option
to extend, exercisable  by NSP.  The NSP  Services Agreement  provides NSP  with
certain  rights  to terminate  the NSP  Services  Agreement prior  to commercial
operation of the network and system (I.E., full deployment) if certain  specific
conditions  are  not met,  such as  approval  of the  NSP Services  Agreement by
governmental authorities to the extent  such approval is required. In  addition,
either  party has  the right  to terminate the  NSP Services  Agreement upon the
occurrence of continuing events of default or if a governmental authority causes
the NSP Services  Agreement to be  rescinded. In addition,  upon the failure  of
either  party to  meet certain  obligations, such  as delays  in installation or
integration schedules thereunder, such party must pay penalty fees to the  other
party.
    
 
   
    CellNet  is entitled to  install and operate its  network equipment on NSP's
property, so long as it pays to NSP market-based rates for such rights.  CellNet
bears the cost of obtaining any necessary third party installation sites.
    
 
   
    PUGET  SOUND POWER & LIGHT COMPANY.   In August 1996, CellNet entered into a
letter of  intent  (the  "Puget  Letter of  Intent")  and  an  Initial  Services
Agreement (the "Puget Initial Services Agreement") with ConnexT, a subsidiary of
Puget  for the provision  of NMR and  other data communications  services over a
network to be operated by CellNet. The Puget Letter of Intent provides that  the
parties  will  enter into  good faith  negotiations with  respect to  a Services
Agreement which would succeed the Puget Initial Services Agreement.
    
 
   
    The Puget  Initial Services  Agreement  covers approximately  15,000  meters
within  Puget Power's service territory.  There are approximately 838,000 meters
within Puget's  service  territory.  The  Company seeks  a  long  term  services
agreement  covering approximately 556,000 meters. The  term of the Puget Initial
Services Agreement continues until 60 days after an evaluation period  following
installation and testing of the network. CellNet is obligated to provide certain
NMR  services  and to  retrofit certain  quantities of  electric and  gas meters
supplied by  ConnexT. ConnexT  has  agreed to  arrange  for Puget  to  undertake
installation  of retrofitted meters, MCCs, CellMasters and other network related
components in the agreed service territory. CellNet will establish communication
links and perform certain other work necessary to complete installation. ConnexT
is paying CellNet monthly services fees based on the number of meters in service
then being used  to bill  customers. CellNet  retains ownership  of its  network
system, all related equipment and radio meter modules. ConnexT retains ownership
of  its  meters  and  certain  other  equipment.  If  CellNet  has  met  certain
performance standards under the Initial Services Agreement and, within one year,
a Services Agreement  has not  been entered into  with Puget  covering at  least
175,000  meters,  ConnexT  may elect  to  continue receiving  NMR  services from
CellNet for  a period  of  not less  than five  years,  or may  discontinue  the
arrangement  upon  making  a  specified termination  payment  intended  to allow
CellNet to recover certain of its invested costs.
    
 
SALES AND MARKETING
 
   
    The Company has organized its sales  and marketing efforts based on  utility
and  non-utility network  applications. For  its utility  segment, the Company's
initial target market  includes utilities  in the 60  largest MSAs  in the  U.S.
which represent a large majority of the meters in the United States. The Company
is also pursuing selected utilities outside the top 60 MSAs. Given the strategic
nature of the Company's utility products, sales cycles typically extend up to 18
months  and  involve the  solicitation,  consultation and  approval  of decision
makers across key  divisions within each  potential utility. The  Company has  a
sales  and marketing organization  of 24 persons,  including six dedicated sales
representatives  with  a  mix  of  utility  and  information  technology   sales
backgrounds,  several of whom have extensive  experience in the electric utility
industry. Regional sales professionals are supported by corporate specialists in
the areas of metering, systems integration, and deployment.
    
 
   
    The Company has established a team of market managers for the development of
new business  opportunities.  This  team develops  business  concepts  that  are
enabled  by  CellNet's  services,  pursues  market  research  to  validate these
concepts and identifies potential alliances that will be required to create  the
    
 
                                       42
<PAGE>
   
products  and services. This team is composed of individuals with backgrounds in
cellular and wireless marketing, product  management and consumer products.  The
Company intends to seek joint venture partners to pursue international markets.
    
 
   
    CellNet's  sales  approach addresses  a utility's  need  to prepare  for the
future competitive environment  by reducing  costs, meeting  present and  future
regulatory  requirements and enhancing customer service. CellNet intends to show
sustained commitment to the utility by entering into long-term performance-based
contracts, typically exceeding ten years. While the sales cycle for utilities is
lengthy, it  results in  the  signing of  long-term service  contracts  covering
thousands  and potentially several million endpoints, providing both significant
recurring revenue and the opportunity to offer additional non-utility services.
    
 
   
    The Company intends  to concentrate  its marketing  efforts for  non-utility
applications  on industry-leading providers of  products and services that would
benefit from the  Company's low-cost  wireless network. The  Company is  working
with  leading manufacturers and  applications developers to  promote and develop
products and  services that  utilize the  Company's networks.  See "--  Business
Strategy  --  Promote  Development  of  Non-Utility  Applications."  The Company
expects that  the manufacturers  and developers  of such  products and  services
would market such services to end users.
    
 
PROPRIETARY RIGHTS
 
    CellNet  relies  on a  combination of  trade secret  protection, copyrights,
patents, trademarks and  confidentiality and licensing  agreements to  establish
and protect its proprietary rights.
 
   
    CellNet's  WAN radio system has been developed using advanced digital signal
processing techniques  and an  RF system  architecture that  enables CellNet  to
create a complete digital cellular system in approximately a single 25 kHz voice
channel.  This technology is  based on narrowband  modulation and compression of
many subchannels into a  single channel. Extremely  stable frequency control  is
required  to preserve system performance.  CellNet's system of frequency control
is the subject of  several issued and pending  patents claims. In addition,  the
efficiency of the frequency protocol utilized by the CellMaster is determined in
part by its ability to recover short burst transmissions from an RTU or MCC. The
CellMaster's  burst data recovery process is  also the subject of several issued
and pending patents claims.
    
 
   
    The spread spectrum radio  technology utilized in the  CellNet LAN has  been
licensed  to CellNet by  Axonn Corporation and an  affiliate of Axonn (together,
"Axonn"). The Axonn  spread spectrum  technology is a  patented, low-cost  radio
system  which  offers the  price /  performance  relationships that  the Company
believes are required for a  commercially-feasible telemetry network. Under  its
licenses from Axonn, CellNet has acquired an exclusive right to use Axonn spread
spectrum  technology  in  the utility  distribution  and service  market  and an
exclusive right to provide services  for other applications outside the  utility
market  through the CellNet system architecture. CellNet's right to provide fire
and security applications based upon  Axonn's technology is not exclusive  under
these  licenses. The Axonn licenses do not  expire by their terms until the last
to expire of any of the patent rights underlying such licenses.
    
 
    CellNet has developed a proprietary, patent-pending approach to transmitting
metering information which allows the LAN to accumulate time of use, demand  and
load  profile  data.  CellNet's  protocols  and  data  transmission  methods are
incorporated in  its  proprietary  firmware. During  the  development  and  test
deployments  of  the  CellNet  WAN  and  LAN  radio  systems,  the  Company  has
accumulated substantial information regarding  cellular and microcellular  radio
systems.  This information is being used  to develop modeling and planning tools
which assist CellNet in the deployment and operation of complex RF systems.  The
Company  has written over  4.5 million lines  of software code  to implement its
system, a process  which required  over 150  staff-years of  design, coding  and
testing and remains a proprietary asset.
 
    The  Company's  success  will depend  in  part  on its  ability  to maintain
copyright and patent protection for its products, to preserve its trade  secrets
and  to operate without infringing the  proprietary rights of third parties. See
"Risk  Factors  --  Uncertainty  of   Protection  of  Copyrights,  Patents   and
Proprietary Rights."
 
                                       43
<PAGE>
RESEARCH AND DEVELOPMENT
 
   
    The Company has steadily increased its research and development efforts over
the past several years and expects to continue to spend a significant portion of
its  resources on these activities for the foreseeable future. The Company spent
$5.3 million, $9.7  million, $22.4 million  and $13.0 million  for research  and
development   in  1993,  1994,  1995  and   the  six  months  ended  June  1996,
respectively. The Company presently employs  more than 85 software and  hardware
engineers  and other  professional staff in  these efforts and  contracts with a
number of  highly-specialized outside  consultants  for additional  services  as
required.  The focus  of the Company's  research and development  efforts in the
past has been on  the development of the  radio hardware, spread spectrum  radio
protocols, System Controllers, intelligent base stations (CellMasters and MCCs),
extensive  software code,  database capacity and  other elements  required for a
flexible,  high-capacity  wireless  data   communications  network  capable   of
processing  data from several  million endpoints on  a real-time basis  at a low
cost. The Company expects that the focus of future research and development will
be to make further enhancements to  the system software, firmware, hardware  and
other equipment to increase the speed, capacity and functionality of the system,
to  lower  the  cost of  system  equipment  over time  and,  working  with other
companies, to expand the scope of  utility and non-utility services that may  be
offered on the system. The Company's future success will depend, in part, on the
Company's  success in  these development  projects which  will require continued
substantial investments.  See "Risk  Factors  -- Technological  Performance  and
Buildout of the System; Rapid Technological Change and Uncertainty."
    
 
    As  part of the Company's research  and development efforts, the Company has
worked closely with current and  potential customers in conducting pilot  trials
and jointly developing system specifications and requirements.
 
COMPETITION
 
   
    The  emerging  market  for  utility  network  automation  systems,  and  the
potential market for other applications accessible once a common  infrastructure
is  in place, have led electronics, communications and utility product companies
to begin development of  various systems, some of  which currently compete,  and
others  of which may in the future compete, with the CellNet system. The Company
believes its  only  significant direct  competitor  in the  marketplace  at  the
present  time is Itron, an established  manufacturer and seller of hand-held and
drive-by automated  meter  reading equipment  ("AMR")  to utilities.  Itron  has
announced  the development of its Genesis-TM- system, a radio network similar to
the Company's for meter reading purposes  and is presently offering that  system
in the marketplace. The Company believes Itron has signed at least two contracts
with utilities for the commercial installation of its Genesis-TM- system.
    
 
    Metricom,  Inc.  a  provider primarily  of  subscriber-based,  wireless data
communications for  users  of  portable and  desktop  computers,  First  Pacific
Networks,  a provider  primarily of bandwidth  efficient wireline communications
technology, and Lucent Technologies are  examples of companies whose  technology
might be adapted for NMR and who may become direct competitors of the Company in
the  future. Schlumberger is developing a fixed network system or application in
cooperation with  Motorola  for  meter reading  as  well.  Schlumberger,  Lucent
Technologies  and First  Pacific Networks  either have  conducted or  are in the
process of  conducting  pilot  trials of  utility  network  automation  systems.
Established  suppliers  of equipment,  services  and technology  to  the utility
industry such  as Asea  Brown Boveri  and General  Electric could  expand  their
current  product  and service  offerings  in the  marketplace  so as  to compete
directly with the  Company, although  they have  not yet  done so.  Many of  the
Company's  present and  potential future competitors  have significantly greater
financial, marketing, technical  and manufacturing  resources, name  recognition
and  experience  than  the  Company. There  may  be  many  potential alternative
solutions to the Company's NMR services.  The Company's competitors may be  able
to  respond more quickly to new or emerging technologies and changes in customer
requirements, or devote greater resources to the development, promotion and sale
of their products  and services  than the  Company. While  CellNet believes  its
technology  is widely regarded as competitive at  the present time, there can be
no assurance  that the  Company's  competitors will  not succeed  in  developing
products  or technologies that  are better or more  cost effective. In addition,
current and potential competitors may  make strategic acquisitions or  establish
cooperative  relationships  among  themselves  or  with  third  parties, thereby
increasing their  ability to  address  the needs  of the  Company's  prospective
customers.  Accordingly, it is possible that  new competitors or alliances among
current and new
 
                                       44
<PAGE>
   
competitors may emerge and rapidly  gain significant market share. In  addition,
if the Company achieves significant success it could draw additional competitors
into  the market. Traditional  providers of wireless services  may in the future
choose  to  enter  the  Company's  markets.  However,  such   telecommunications
applications  are not well suited  for use in NMR  or similar applications given
certain technical challenges and economic  costs such as high embedded  spectrum
costs.  Such existing and  future competition could  materially adversely affect
the pricing  for  the Company's  services  and  the Company's  ability  to  sign
long-term contracts and maintain existing agreements with utilities. Competition
or  services  relating  to non-utility  applications  may be  more  intense than
competition for utility NMR services. There can be no assurance that the Company
will be able to compete successfully against current and future competitors, and
any failure to  do so  would have  a material  adverse effect  on the  Company's
business, operating results, financial condition and cash flow.
    
 
   
    The  Company  believes the  principal competitive  factors for  NMR services
include price, quality of service,  system functionality, reliability, and  ease
of  installation. The Company believes it  competes favorably in these areas. In
particular, the Company believes  that it has  developed the first  commercially
deployed,   large-scale  network-based  NMR  system  capable  of  simultaneously
collecting, processing, transporting and sharing data from millions of endpoints
on an efficient and timely basis.
    
 
REGULATION
 
   
    The Company's network equipment uses radio spectrum, and as such, is subject
to regulation by the FCC. In addition, CellNet intends to provide services as  a
private  carrier.  This  status  allows  services  to  be  provided  pursuant to
individual contracts without being subject to many of the statutory requirements
and FCC  and state  regulations  that govern  the  provision of  common  carrier
services.  The  Company's network  equipment uses  both licensed  radio spectrum
allocated for MAS operations in the 928/952 MHz band, and unlicensed spectrum in
the 902-928 MHz  band. In order  to obtain  a license to  operate the  Company's
network equipment in the 928/952 MHz band, license applicants may need to obtain
a  waiver  of various  sections of  the  FCC's rules.  Although the  Company has
obtained such  waivers for  its  licensed systems  routinely  in the  past,  and
expects  the required waivers  to be granted  on a routine  basis in the future,
there can be no assurance that the  Company will be able to obtain such  waivers
on  a timely  basis or  to obtain  them at  all. In  addition, as  the amount of
spectrum in  the 928/952  MHz band  is limited,  issuance of  these licenses  is
contingent  upon  the availability  of  spectrum in  the  area(s) for  which the
licenses are requested. The Company might not be able to obtain licenses to  the
spectrum it needs in every area in which it has prospective customers. The FCC's
rules,  subject to a number of limited  exceptions, permit third parties such as
CellNet to operate on spectrum licensed to utilities to provide other  services.
The  Company plans  to use  these provisions  of the  FCC's rules  to expand its
CellNet system. The FCC  has the authority  to amend its rules  at any time  and
such  changes could  have a  material adverse  effect on  the Company's spectrum
utilization strategy. The FCC  requires that a minimum  configuration of an  MAS
system be in operation within eighteen months from the initial date of the grant
of  the  system authorization  or risk  forfeiture  of the  license for  the MAS
frequencies. The eighteen month deadline may be extended upon a showing of  good
cause, but there is no assurance that the FCC will grant any such extension. The
Company  is responding by selectively building out transmission capacity in some
areas where it does  not yet have  utility telecommunications service  contracts
and may permit licenses to lapse in certain areas.
    
 
    No  license  is  needed to  operate  the Company's  equipment  utilizing the
902-928 MHz band, although  the equipment must be  certified by the Company  and
the  FCC as  being compliant  with certain  FCC restrictions  on radio frequency
emissions designed to protect licensed services from objectionable interference.
While the Company believes it has  obtained all required certifications for  its
products,  the FCC could modify the limits imposed on such products or otherwise
impose new authorization requirements,  and in either  case, such changes  could
have  a  material adverse  impact on  the Company's  business. The  FCC recently
completed a  new  rulemaking  proceeding  designed  to  better  accommodate  the
cohabitation  in the 902-928  MHz band of existing  licensed services with newly
authorized and  expanded  uses  of  licensed systems,  and  existing  and  newly
designed  unlicensed devices like those used by the Company. In this proceeding,
the FCC expressly recognized the rights  of such unlicensed services to  operate
under  certain  delineated  operating  parameters  even  if  the  potential  for
interference to the licensed operations exists. The
 
                                       45
<PAGE>
Company's systems  will  operate  within those  specified  parameters.  The  FCC
retains  the right  to modify  those rules or  to allow  for other  uses of this
spectrum that might create interference to the Company's systems, in either case
with a material adverse impact on the Company's business or operations in  these
frequency bands.
 
    While the Company intends to offer non-utility services as a private carrier
and  in accordance with FCC  Rules, each such service  offering would need to be
reviewed relative to these rules. The FCC's rules currently prohibit the use  of
the  MAS  frequencies on  which the  Company  is operating  its systems  for the
provision of  common  carrier  service  offerings.  In  the  event  that  it  is
determined  that a particular  service offering does not  comply with the rules,
the Company may  be required  to restructure such  offering or  to access  other
frequencies  for  the  purpose  of  providing  such  service.  There  can  be no
assurances that the Company will gain  access to such other frequencies.  Future
interpretation  of regulations by  the FCC or  changes in the  regulation of the
Company's industry  by the  FCC or  other regulatory  bodies or  legislation  by
Congress could have a material adverse effect on the Company's operations.
 
EMPLOYEES
 
    As  of June  30, 1996,  CellNet had 446  employees, including  88 in product
development, 229 in materials and manufacturing,  33 in sales and marketing,  65
in  field service and support,  and 31 in administration.  None of the Company's
employees is currently represented by a  labor union. The Company believes  that
its relationship with its employees is good.
 
PROPERTIES
 
   
    The  Company's administrative, sales and  marketing, product development and
production facilities are located in  San Carlos, California, where the  Company
leases  approximately 66,000  square feet  under an  agreement which  expires on
December 31,  2000.  The Company  will  require  additional space  to  meet  its
currently  anticipated requirements  for expansion and  is presently negotiating
for additional  space near  its  present office  complex.  A subsidiary  of  the
Company  leases approximately 30,000 square feet  of factory and warehouse space
in Kansas City, Missouri  where meter retrofit operations  are carried out.  The
Company anticipates that it will be able to acquire additional space as required
for its operations on acceptable terms.
    
 
LITIGATION
 
   
    Although  the Company has been granted federal registration of its "CellNet"
trademark,  in  January  1995  Century  Telephone  Enterprises,  Inc.  ("Century
Telephone")  filed a petition  for cancellation in an  attempt to challenge such
registration. The matter  is currently  pending before the  Trademark Trial  and
Appeal  Board  of the  U.S.  Patent and  Trademark  Office. CellNet  and Century
Telephone are the sole parties in the action. If such challenge were successful,
the Company could lose  its registration and  could be required  to adopt a  new
trademark and possibly a new or modified corporate name. CellNet could encounter
similar challenges in the future. See "Risk Factors -- Uncertainty of Protection
of Copyrights, Patents and Proprietary Rights."
    
 
    The Company has no other pending litigation.
 
                                       46
<PAGE>
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
    The  following table sets forth certain information concerning the executive
officers and directors of the Company as of June 30, 1996.
 
<TABLE>
<CAPTION>
            NAME                 AGE                                    POSITION
- ----------------------------  ---------  -----------------------------------------------------------------------
<S>                           <C>        <C>
John M. Seidl...............         57  President, Chief Executive Officer and Director
Cree A. Edwards.............         39  Vice President, Business Development
Robert A. Hayes.............         44  Vice President, Development
James J. Jennings...........         49  Vice President, Sales and Marketing
Larsh M. Johnson............         38  Vice President and Chief Technology Officer
Paul G. Manca...............         37  Vice President and Chief Financial Officer
Philip H. Mallory...........         56  Vice President and General Manager, Services and Operations
David L. Perry..............         55  Vice President, General Counsel, Secretary and Chief Administrative
                                          Officer
Paul M. Cook................         72  Chairman of the Board
Neal M. Douglas(2)..........         37  Director
William C. Edwards(2).......         67  Director
William Hart(2).............         56  Director
Brian Kwait.................         35  Director
Nancy E. Pfund(1)...........         40  Director
Paul J. Salem(1)............         32  Director
Henry B. Sargent(1).........         62  Director
</TABLE>
 
- ---------
(1) Member of the Audit Committee
 
(2) Member of the Compensation Committee
 
   
    JOHN M. SEIDL became  President, Chief Executive Officer  and a director  of
the  Company in September 1994. From December  1992 to September 1994, Mr. Seidl
served as a director of St. Mary's Land & Exploration Company, CRSS, Inc.,  J.B.
Poindexter,  Inc.  and  a  privately-held  company.  From  January  1989 through
December 1992, Mr.  Seidl served  as a director  of MAXXAM,  Inc., an  aluminum,
forest  products  and  real estate  concern,  and Chairman  and  Chief Executive
Officer of Kaiser  Aluminum Corporation.  From September  1990 through  December
1992  Mr. Seidl also served  as President of MAXXAM,  Inc. Previously, Mr. Seidl
was Executive Vice  President, from  July 1985 to  May 1986,  and President  and
Chief  Operating Officer,  from May  1986 to  January 1989,  of Enron  Corp., an
energy company.  Mr.  Seidl  currently  is  a director  of  St.  Mary's  Land  &
Exploration   Company  and  several   privately-held  companies  and  non-profit
organizations. He received a B.S. degree  in Engineering from the United  States
Military Academy, and M.P.A. and Ph.D. degrees in Political Economy from Harvard
University.
    
 
    CREE  A.  EDWARDS is  a co-founder  of the  Company and  has served  as Vice
President, Business Development since January 1994. Mr. Edwards was President of
the Company from October 1984 to  February 1990 and Executive Vice President  of
the  Company from February  1990 to January  1994. Prior to  founding CellNet in
1984,  Mr.  Edwards  was  an   Area  Sales  Manager  for  Octel   Communications
Corporation,  a voice processing manufacturer,  from September 1984 to September
1985, and a Major Accounts Manager for the General Electric Information Services
Company from  March  1983  to September  1984.  He  received a  B.A.  degree  in
Economics from the University of California at Davis.
 
                                       47
<PAGE>
    ROBERT  A.  HAYES joined  the  Company in  January  1993 as  Vice President,
Special  Assistant  to  the  President.  He  became  Vice  President,   Software
Development  in March 1994 and was  named Vice President, Development in January
1995. From February 1991 to December 1992, Mr. Hayes held a number of  positions
with   Everex  Systems,  Inc.  ("Everex"),  a  computer  hardware  manufacturer,
including Vice  President  of  Manufacturing,  Vice  President  of  Quality  and
Service,  Manager of the  Network Division and Group  Manager of Service. Everex
filed for Chapter 11 bankruptcy protection  in January 1993. Mr. Hayes  received
B.S. and M.C.E. degrees in Civil Engineering from Rice University.
 
    JAMES  J. JENNINGS joined the Company in  August 1994 and has served as Vice
President, Sales and Marketing since that time. From April 1988 until July 1994,
Mr. Jennings was a Vice President  of Octel Communications Corporation, a  voice
processing   manufacturer,  where  he  served  in  a  variety  of  domestic  and
international sales, marketing and business development capacities. Mr. Jennings
served as an officer in the United  States Army from 1968 to 1975. Mr.  Jennings
holds  a B.S. degree in Engineering from  the United States Military Academy and
an M.B.A. degree from the University of San Francisco.
 
   
    LARSH M. JOHNSON is a  co-founder of the Company  and has served in  several
vice  presidential  positions  from October  1984  to December  1994  and, since
January 1995, as Vice President and  Chief Technology Officer. While at  CellNet
and  prior to co-founding  the Company in  1984, he was  a self-employed product
design consultant from May 1983 to June 1985 and Director of Product Development
at  Interactive  Communications  Corporation,  a  video  systems  company,  from
February  1984 to June 1985.  Mr. Johnson was an  Engineering Manager at Digital
Optics Corporation,  a company  specializing  in electro-optical  systems,  from
March  1981  to  April  1983  and  an  electrical  engineer  at  Systems Control
Corporation, a  computer hardware  company, from  June 1980  to April  1981.  He
received   B.S.  and  M.S.  degrees  in  Mechanical  Engineering  from  Stanford
University.
    
 
    PAUL G. MANCA joined  the Company in  May 1995 as  Vice President and  Chief
Financial Officer. From March 1993 to May 1995, he was the Managing Director and
Group  Head of the  Communications Group at BZW/Barclays  Bank. Mr. Manca joined
BZW/Barclays Bank as Vice President, Merchant Banking Division in February 1987.
From June 1980 to February 1987, Mr. Manca was employed in the corporate finance
group of the Canadian Imperial  Bank of Commerce. He  received a B.A. degree  in
Economics  from the University  of California, Berkeley and  an M.B.A. degree in
Finance from Golden Gate University.
 
    PHILIP H. MALLORY joined the Company  in January 1995 as Vice President  and
General  Manager, Services.  In June 1996,  he assumed the  additional duties of
Vice President, Operations.  From June 1992  to January 1995,  Mr. Mallory  held
various  positions  at  CAE-Link Corporation,  a  defense  contractor, including
Director of Strategic  Planning, Director  - Product Management  and Director  -
Department  of Defense Marketing. Mr. Mallory served  as a career officer in the
United States Army from June  1961 to August 1991,  attaining the rank of  Major
General  prior to  his retirement. During  his army  career he held  a number of
posts, including Commanding General of the 2nd Armored Division, NATO Advisor to
the Secretary of Defense,  and the Commanding General  of the 7th Army  Training
Command.  Mr.  Mallory received  a B.S.  degree in  Engineering from  the United
States Military Academy and an M.S. degree in Engineering - Applied Science from
the University of California,  Davis. Mr. Mallory  also attended the  Industrial
College  of  the  Armed  Forces  in  Washington,  D.C.,  where  he  attained the
equivalent of a master's degree in Resource Management.
 
    DAVID L.  PERRY joined  the  Company in  November  1994 as  Vice  President,
General Counsel and Secretary, and was appointed Chief Administrative Officer in
February 1996. From January 1992 through November 1994, Mr. Perry was engaged as
an  attorney in private  practice. From January 1984  through December 1991, Mr.
Perry was Vice  President and  General Counsel of  Kaiser Aluminum  Corporation.
From  August  1969 through  December  1983, Mr.  Perry  served in  a  variety of
capacities in Kaiser Aluminum's Law Department. Mr. Perry received a B.A. degree
from Amherst  College and  a J.D.  degree from  the Boalt  Hall School  of  Law,
University of California, Berkeley.
 
   
    PAUL  M. COOK has been  a director of the  Company continuously since August
1990. Mr. Cook became Chief Executive Officer of the Company in August 1990, and
assumed the additional title of President in 1992. He relinquished the positions
of  President  and  Chief  Executive  Officer  in  September  1994.  Since  June
    
 
                                       48
<PAGE>
   
1995, Mr. Cook has been the Chief Executive Officer and Chairman of the Board of
DIVA  Systems Corp.,  a company  developing video-on-demand  products. Until his
retirement in  April 1990,  Mr.  Cook was  Chief  Executive Officer  of  Raychem
Corporation,  a plastics and insulation manufacturer,  which he founded in 1957.
Since September  1994, Mr.  Cook has  served as  Chairman of  the Board  of  SRI
International,  Inc., and as  a director of  Raychem Corporation. Currently, Mr.
Cook is also a director of Chemfab  Corporation. He received a B.S. degree  from
the Massachusetts Institute of Technology.
    
 
   
    NEAL M. DOUGLAS has been a director of the Company since October 1993. Since
January 1993 he has been a general partner of AT&T Ventures Company, L.P. ("AT&T
Ventures"),  a venture  capital firm. From  May 1989  to January 1993,  he was a
partner of New Enterprise Associates, another venture capital firm. Mr.  Douglas
also serves as a director of two privately held companies.
    
 
   
    WILLIAM  C. EDWARDS has been a director  of the Company from October 1985 to
April 1986 and has been a director continuously since March 1991. Since  October
1968  he  has  been  a  general  partner  of  Bryan  &  Edwards,  an  investment
partnership. Mr. Edwards also  serves as a director  of Western Atlas, Inc.  and
two privately held companies.
    
 
    WILLIAM  HART has been a director of  the Company since October 1992. He has
been a general partner of Technology Partners, a venture capital firm, since its
founding in 1979.  Mr. Hart  also serves as  a director  of Trimble  Navigation,
Ltd., Silicon Gaming, Inc. and several privately held corporations.
 
   
    BRIAN KWAIT has been a director of the Company since October 1995. Mr. Kwait
has been a principal at Odyssey Partners, L.P. ("Odyssey"), a private investment
firm,  since August 1989.  Mr. Kwait also  serves as a  director of The Scotsman
Group, Inc. and one privately held company.
    
 
   
    NANCY E. PFUND has been a director of the Company since January 1991.  Since
December  1989, she has been an employee  of Hambrecht & Quist Group ("H&Q"), an
investment banking firm.  Ms. Pfund  is also a  principal of  Hambrecht &  Quist
Venture  Partners and  a general  partner of  H&Q Environmental  Principals. She
serves as a director of Gensym Corp.
    
 
   
    PAUL J. SALEM has  been a director  of the Company  since January 1996.  Mr.
Salem  has  been a  vice president  of Providence  Ventures Inc.,  an investment
management firm, since June 1992. From August  1991 to June 1992, Mr. Salem  was
an  associate at Morgan Stanley &  Co. Incorporated, an investment banking firm.
Mr. Salem also serves as a director of several privately held companies.
    
 
   
    HENRY B. SARGENT has been a director of the Company since January 1996.  Mr.
Sargent  has been President, Chief Executive Officer and a director of El Dorado
Investment Company ("El Dorado"), a venture capital firm, for more than the past
five years. From May 1987  to June 1995, he  was also Executive Vice  President,
Chief  Financial  Officer and  a  director of  Pinnacle  West Capital  Corp., an
electric utility  holding company.  Mr. Sargent  also serves  as a  director  of
Pinnacle  West Capital Corp., Arizona Public  Service Co., Megafood Stores, Inc.
and several privately held companies.
    
 
    William C. Edwards  is the father  of Cree  A. Edwards. There  are no  other
family relationships among the directors or executive officers of the Company.
 
BOARD OF DIRECTORS
 
   
    The  Company's Bylaws authorize a Board of  Directors that can range in size
from six to 11 directors, with the number of directors presently set at ten. The
Company currently has nine directors and one vacancy. All directors hold  office
until  the next  annual meeting of  stockholders or until  their successors have
been elected. Officers of the  Company serve at the  discretion of the Board  of
Directors.  Under the terms of the Shareholders' Agreement among the Company and
the holders of 69.6% of  the issued and outstanding  shares of capital stock  of
the  Company (after giving effect  to the issuance of  the Shares offered hereby
and in the Utility  Stock Purchases), the Company  agreed to set the  authorized
number of directors on the Board of Directors at ten, and the stockholders party
thereto  have agreed to elect  the following persons to  the Board of Directors:
(i) one candidate selected by H&Q, currently Nancy E. Pfund; (ii) one  candidate
selected  by El Dorado, currently Henry B. Sargent; (iii) Paul M. Cook; (iv) one
candidate selected by  Banner Partners,  currently William C.  Edwards; (v)  one
candidate  selected  by  AT&T  Ventures, currently  Neal  M.  Douglas;  (vi) one
candidate selected  by  Odyssey,  currently Brian  Kwait;  (vii)  one  candidate
selected  by Providence Media Partners L.P., currently Paul J. Salem; (viii) one
candidate selected by Kleiner, Perkins, Caufield &
    
 
                                       49
<PAGE>
   
Byers, which position is currently vacant; and (ix) the Chief Executive  Officer
of  the  Company,  currently John  M.  Seidl. The  foregoing  voting obligations
terminate upon  the  closing of  this  Offering. Following  this  Offering,  the
Company  will continue to be obligated to nominate for election as directors the
persons designated by the parties to the Shareholders' Agreement for as long  as
such  parties continue to hold not less  than 700,000 shares of Common Stock (as
such number may be adjusted from  time to time for stock splits,  consolidations
or  other similar events). The parties  to the Shareholders' Agreement have also
agreed to take such  action as is  necessary to retain  the right of  cumulative
voting  in the election of directors and to maintain a Board of Directors of not
less  than  eight  directors  until  August  15,  1997.  See  "Risk  Factors  --
Shareholders' Agreement" and "Description of Capital Stock -- Common Stock."
    
 
DIRECTORS' COMPENSATION
 
    The  Company does not pay any compensation  to directors for serving in that
capacity, nor does  it reimburse  directors for expenses  incurred in  attending
board  meetings. Under the terms of the Shareholders' Agreement, the Company has
agreed  to  reimburse  the  directors  elected  pursuant  to  the  Shareholders'
Agreement  for such expenses following the closing  of this Offering for so long
as such persons continue to serve as directors.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
   
    The Compensation  Committee of  the  Board of  Directors consists  of  three
non-employee directors, Mr. Edwards, Chairman, and Messrs. Douglas and Hart. The
Compensation   Committee  makes  recommendations  to   the  Board  of  Directors
concerning salaries and incentive compensation for employees of and  consultants
to  the Company.  Mr. Edwards  is the  father of  Cree A.  Edwards, an executive
officer  of  the  Company.  No  interlocking  relationship  exists  between  the
Company's  Board  of  Directors  or  Compensation  Committee  and  the  board of
directors or  compensation  committee of  any  other  party, nor  has  any  such
relationship  existed  in the  past. Entities  affiliated with  Messrs. Edwards,
Douglas and Hart are stockholders of the Company and have entered into financing
arrangements with the Company from time to time. See "Certain Transactions."
    
 
AUDIT COMMITTEE
 
    The Audit Committee of the Board of Directors consists of three non-employee
directors, Ms. Pfund, Chair, and Messrs. Salem and Sargent. The Audit  Committee
reviews  the nature, scope and results of  the independent audit of the Company,
the Company's accounting principles and  internal accounting controls and  other
matters  relating  to  the relationship  of  the independent  auditors  with the
Company.
 
                                       50
<PAGE>
EXECUTIVE COMPENSATION
 
    The following  table  sets forth  certain  information for  the  year  ended
December  31, 1995 regarding  the compensation of  the Company's Chief Executive
Officer and each of  the other four most  highly compensated executive  officers
whose  annual  compensation  (salary and  bonus)  for services  rendered  in all
capacities to  the Company  during the  year ended  December 31,  1995  exceeded
$100,000 (collectively, the "Named Executive Officers").
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                   ANNUAL COMPENSATION
                                                          -------------------------------------
                        NAME AND                                                  OTHER ANNUAL       ALL OTHER
                   PRINCIPAL POSITION                       SALARY      BONUS     COMPENSATION    COMPENSATION(1)
- --------------------------------------------------------  ----------  ----------  -------------  -----------------
<S>                                                       <C>         <C>         <C>            <C>
John M. Seidl ..........................................  $  300,000  $  135,000       --            $   1,237
 President and Chief Executive Officer
James J. Jennings ......................................     175,060      --           --                  902
 Vice President, Sales and Marketing
Robert A. Hayes ........................................     165,000      10,000       --                  872
 Vice President, Development
Larsh M. Johnson .......................................     165,000      --           --                  872
 Vice President and Chief Technology Officer
Philip H. Mallory ......................................     138,654      --        $  50,000(2)           762
 Vice President and General Manager, Services and
 Operations
</TABLE>
 
- ---------
 
(1) Represents  premium  payments  made  by  the  Company  for  life  insurance,
    accidental death and dismemberment, and long-term disability policies.
 
(2) Represents a relocation allowance.
 
    OPTION GRANTS IN  LAST YEAR.   The Company  made no stock  option grants  or
restricted  stock awards during  the year ended  December 31, 1995  to the Named
Executive Officers.  However,  during 1995  the  Company did  permit  the  Named
Executive  Officers to  exercise unvested,  previously-granted stock  options to
purchase shares of restricted stock with vesting terms comparable to the vesting
terms of the options exercised.
 
    AGGREGATED OPTION EXERCISES  IN LAST YEAR  AND YEAR-END OPTION  VALUES   The
following table sets forth, for each of the Named Executive Officers, the shares
acquired  and the value  realized on each  exercise of stock  options during the
year ended December 31,  1995 and the year-end  number and value of  exercisable
and unexercisable options.
 
   
<TABLE>
<CAPTION>
                                                                 NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                                UNDERLYING UNEXERCISED       IN-THE MONEY OPTIONS
                                    SHARES                    OPTIONS AT 12/31/95(#)(2)      AT 12/31/95($)(1)(2)
                                  ACQUIRED ON      VALUE      --------------------------  --------------------------
             NAME                EXERCISE(#)(2) REALIZED($)   EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- -------------------------------  -------------  ------------  -----------  -------------  -----------  -------------
<S>                              <C>            <C>           <C>          <C>            <C>          <C>
John M. Seidl..................      800,000    $  1,000,000           0              0    $       0    $         0
James J. Jennings..............      180,000         225,000           0              0            0              0
Robert A. Hayes................            0               0     109,000        121,000      143,150        147,350
Philip H. Mallory..............      170,000         170,000           0              0            0              0
Larsh M. Johnson...............      220,658         248,158     106,190        173,952      148,576        190,427
</TABLE>
    
 
- ---------
   
(1)  Calculated  by determining  the difference  between the  fair value  of the
    securities underlying the option on  December 31, 1995 (which, for  purposes
    of  this table, is assumed  to equal the fair  value of the Company's Common
    Stock as  last determined  during fiscal  1995 on  October 11,  1995 by  the
    Company's  Board of Directors,  or $1.50 per share),  and the exercise price
    (ranging from $0.05 to $0.50 per share).
    
 
   
(2) From December 1994 through August 1995 the Company issued and sold  pursuant
    to  the  early  exercise  of  previously-granted  options,  an  aggregate of
    1,770,658 shares  of restricted  Common Stock  to Messrs.  Seidl,  Jennings,
    Mallory  and Johnson at prices  ranging from $0.05 to  $0.50 per share, with
    the
    
 
                                       51
<PAGE>
    purchase prices of such shares equal to the original exercise prices of such
    options. Such shares  of restricted  stock were  purchased with  cash or  by
    delivery  of  promissory  notes  by such  Named  Executive  Officers  to the
    Company.  See  "Certain  Transactions."   The  loans  represented  by   such
    promissory  notes are  full recourse,  bear interest  at rates  ranging from
    6.04% to 7.92% per annum and mature  on the fifth anniversary of such  note.
    Each such promissory note is secured by the shares of Common Stock purchased
    with  the proceeds of the  loans. These shares are  subject to repurchase by
    the Company  at the  original  price paid  per  share upon  the  purchaser's
    cessation  of service prior  to the vesting of  such shares. This repurchase
    right lapsed and  the purchaser  vested as to  a certain  percentage of  the
    shares  on the date of purchase and  the repurchase right will lapse and the
    purchaser will  vest in  the balance  of the  shares in  a series  of  equal
    quarterly  or annual installments in accordance with the vesting schedule of
    the exercised options. Information with respect to the shares of  restricted
    stock purchased by such Named Executive Officers is set forth below:
 
   
<TABLE>
<CAPTION>
                                              NUMBER OF
                                              RESTRICTED        NUMBER OF        VALUE OF
                                                SHARES       UNVESTED SHARES  UNVESTED SHARES
                  NAME                       PURCHASED(#)    AT 12/31/95(#)   AT 12/31/95($)
- -----------------------------------------  ----------------  ---------------  ---------------
<S>                                        <C>               <C>              <C>
John M. Seidl............................       1,200,000         750,000      $   1,125,000
James J. Jennings........................         180,000         117,000            175,500
Philip H. Mallory........................         170,000         127,500            191,250
Larsh M. Johnson.........................         220,658         117,158            175,737
</TABLE>
    
 
INCENTIVE STOCK PLANS
 
   
    1992  STOCK OPTION PLAN.   The Company's  1992 Stock Option  Plan (the "1992
Plan") was  adopted by  the Board  of Directors  and approved  by the  Company's
stockholders  in September 1992. A total of 6,000,000 shares of Common Stock are
reserved for issuance under the 1992 Plan. As of June 30, 1996, 3,375,748 shares
of Common Stock had been issued upon  exercise of stock options, and options  to
purchase an aggregate of 2,416,642 shares were outstanding at a weighted average
exercise  price of $.21615 per share, of  which 1,357,726 shares were vested. In
connection with the adoption of the 1994 Plan described below, the 1992 Plan was
terminated  and  no  additional  options  may  be  granted  thereunder.  Options
previously  granted under  the 1992  Plan will  continue to  be governed  by the
provisions of such plan.
    
 
    1994 STOCK  PLAN.   The Company's  1994  Stock Plan  (the "1994  Plan")  was
adopted  by  the  Board  of  Directors in  December  1994  and  approved  by the
stockholders in June 1995. Options granted under the 1994 Plan may be  incentive
stock  options, nonstatutory stock  options or stock  purchase rights. Employees
(including employee directors) and consultants (including nonemployee directors)
are eligible for nonstatutory stock options and stock purchase rights, and  only
employees are eligible for incentive stock options under the 1994 Plan. The 1994
Plan  is administered by the Board of Directors or a committee thereof. The plan
administrator has  the authority  to  determine the  fair  market value  of  the
shares,  select the employees and consultants to whom options and stock purchase
rights may be granted, determine the number of shares covered by each option and
stock purchase right granted, and determine the term, exercise price and vesting
schedule of options granted under the 1994 Plan.
 
   
    A total of 3,000,000 shares of Common Stock are reserved for issuance  under
the  1994 Plan.  As of June  30, 1996, 537,832  shares of Common  Stock had been
issued upon  exercise of  stock options,  options to  purchase an  aggregate  of
1,362,494  shares  were  outstanding at  a  weighted average  exercise  price of
$1.3489 per share,  of which 158,212  shares were vested,  and 1,099,674  shares
remained available for future issuance under the 1994 Plan.
    
 
    In  the event of a merger of the Company with or into another corporation or
a sale of substantially all of the Company's assets, the 1992 Plan and the  1994
Plan  each provides that options issued under  such plans will be assumed, or an
equivalent option substituted,  by the successor  corporation. If the  successor
corporation  does not agree to such  assumption or substitution, the option will
vest in full and become exercisable.
 
   
    1996 EMPLOYEE  STOCK  PURCHASE PLAN.    The Company's  1996  Employee  Stock
Purchase  Plan (the "Purchase  Plan") was adopted  by the Board  of Directors in
July 1996 and will  be submitted to the  stockholders for approval in  September
1996.  A total  of 1,200,000  shares of Common  Stock are  reserved for issuance
under the Purchase Plan.  Under the Purchase Plan,  the Company will withhold  a
specified percentage of
    
 
                                       52
<PAGE>
each  salary payment to  participating employees over  certain offering periods.
Any employee who is then employed for at least 20 hours per week by the  Company
(or any majority-owned subsidiary designated by the Board of Directors from time
to  time), and who does not own 5% or more of the total combined voting power or
value of  all classes  of  the capital  stock  of the  Company  or of  any  such
subsidiary, is eligible to participate in the Purchase Plan. Unless the Board of
Directors  shall  determine otherwise,  each offering  period  will run  for six
months, from November 1 to  April 30 and from May  1 to October 31, except  that
the  first offering period will commence on  the date of this Prospectus and end
on April 30, 1997. The  price at which Common Stock  may be purchased under  the
Purchase  Plan is equal to 85%  of the fair market value  of the Common Stock on
the first or last day of the applicable offering period, whichever is lower.
 
EMPLOYMENT CONTRACTS AND CHANGE OF CONTROL ARRANGEMENTS
 
   
    The Company entered into an employment  agreement with Mr. Jennings in  July
1994.  The agreement provides for an annual  base salary of $175,060 and certain
performance-based bonuses to be determined  by the Company's President. As  part
of  the agreement,  the Company  granted to Mr.  Jennings an  option to purchase
180,000 shares of Common Stock at $0.25  per share, with 10% vesting six  months
from  the date of hire and the remainder vesting at a rate of 5% per quarter. If
Mr. Jennings is terminated  by the Company  without cause at  any time, he  will
receive his annual base salary and benefits for an additional twelve months, and
40%  of any unvested shares of restricted stock held by Mr. Jennings will become
vested as of the date of termination.
    
 
    Each of the Named  Executive Officers are parties  to an Employee  Severance
Agreement  with  the Company  which provides  for  accelerated vesting  of their
respective stock options and for the lapse of the Company's rights to repurchase
unvested  stock  under  all  restricted  stock  purchase  agreements  upon   the
occurrence of certain events following a change of control of the Company. These
events  will occur if: (i) the  Named Executive Officer's stock option agreement
or restricted  stock purchase  agreement is  terminated without  such  officer's
consent,  or if the terms of such agreements are not assumed by any successor to
the Company;  (ii)  the  Named  Executive Officer  does  not  receive  identical
securities  or  consideration,  upon  such  officer's  exercise  of  options  or
restricted stock purchases, as other shareholders are receiving as part of  such
change  of  control;  (iii) six  months  have  elapsed following  the  change of
control, so long as the Named Executive Officer remains employed by the Company;
or (iv) the Named Executive  Officer is terminated or constructively  terminated
following the change of control.
 
LIMITATIONS ON DIRECTORS' LIABILITIES AND INDEMNIFICATION
 
    The   Company  has  adopted  provisions   in  its  Restated  Certificate  of
Incorporation that  eliminate  the  personal  liability  of  its  directors  for
monetary  damages  arising  from breach  of  their fiduciary  duties  in certain
circumstances and authorize the Company to indemnify its directors and officers,
in each case to the fullest  extent permitted by Delaware law. Such  limitations
of  liability do not  apply to liabilities arising  under the Federal securities
laws and do not affect the availability of equitable remedies such as injunctive
relief or rescission.
 
    The Company's Bylaws provide that  the Company will indemnify its  directors
and  officers to the  fullest extent permitted by  Delaware law, including under
circumstances in which indemnification is otherwise discretionary under Delaware
law. The Company has entered  into indemnification agreements providing for  the
foregoing  with  its  directors and  executive  officers.  These indemnification
agreements may  require  the Company,  among  other things,  to  indemnify  such
officers  and directors against certain liabilities  that may arise by reason of
their status or service as officers  or directors and to advance their  expenses
(including  expenses of counsel) incurred as  a result of any proceeding against
them as to which they could be indemnified.
 
    At present,  there  is  no  pending litigation  or  proceeding  involving  a
director  or  officer  of  the  Company  where  indemnification  is  required or
permitted, nor is the Company aware  of any threatened litigation or  proceeding
that may result in a claim for such indemnification.
 
                                       53
<PAGE>
                              CERTAIN TRANSACTIONS
 
   
    Since  January  1, 1993,  the  Company has  sold  shares of  Preferred Stock
convertible into an aggregate of 14,704,886  shares of Common Stock in a  series
of  private financings. In October  1993 and December 1993,  shares of Series BB
Preferred Stock convertible into 6,979,690 shares  of Common Stock were sold  at
an  as-converted price of $2.375  per share. In connection  with such sales, the
Company also issued warrants  to acquire 766,888 shares  of Series BB  Preferred
Stock  at an exercise price of $4.75 per share. In August 1994, shares of Series
CC Preferred Stock convertible into 6,431,536  shares of Common Stock were  sold
at an as-converted price of $4.82 per share. In December 1994 and February 1995,
shares  of Series DD Preferred Stock convertible into 1,293,660 shares of Common
Stock were sold at an as-converted price  of $4.82 per share. The purchasers  of
the Series BB Preferred Stock, Series CC Preferred Stock and Series DD Preferred
Stock  included the  following 5% or  more stockholders,  directors and entities
affiliated with directors.
    
 
<TABLE>
<CAPTION>
                                                                                                   SHARES OF
                                                                                                   SERIES BB
                                                             SHARES OF PREFERRED STOCK (1)         PREFERRED
                                                          -----------------------------------   STOCK UNDERLYING
                          NAME                            SERIES BB   SERIES CC    SERIES DD      WARRANTS (2)
- --------------------------------------------------------  ----------  ----------  -----------  ------------------
<S>                                                       <C>         <C>         <C>          <C>
DIRECTORS AND ENTITIES AFFILIATED WITH DIRECTORS
Paul and Marcia Cook Living Trust
 (Paul M. Cook).........................................      63,340      10,373      --               19,002
AT&T Ventures (Neal M. Douglas).........................     631,580      48,842      --              126,316
Entities affiliated with William C. Edwards.............     191,840      31,122       1,321           56,002
Technology Partners West Fund IV, L.P.
 (William Hart).........................................      44,730      10,373         417           13,419
Odyssey Partners, L.P. (Brian Kwait)....................   1,450,660     112,184      --              290,132
Entities affiliated with Hambrecht & Quist
 (Nancy E. Pfund).......................................     213,585      35,794       1,520           48,343
Pfund Polakoff Family Trust (Nancy E. Pfund)............       2,025      --          --                  426
Providence Media Partners L.P. (Paul J. Salem)..........      --       1,037,344      44,044           --
Entities affiliated with Henry B. Sargent...............     161,245      --          --               41,623
 
OTHER 5% OR MORE STOCKHOLDERS
Entities affiliated with Acorn Ventures, Inc............     289,570     231,463       9,827           68,468
</TABLE>
 
- ---------
   
(1) Each share of Preferred Stock will automatically convert into two shares  of
    Common Stock upon the closing of this Offering.
    
 
(2) Each warrant to purchase Series BB Preferred Stock is exercisable at a price
    of  $4.75 per share and will expire immediately prior to the closing of this
    Offering. This  Prospectus  assumes  that  all  of  such  warrants  will  be
    exercised  and that  the shares of  Series BB Preferred  Stock issuable upon
    such exercise will automatically  convert into shares  of Common Stock  upon
    the closing of this Offering.
 
    Between  April  28,  1993  and  September  13,  1993,  Acorn  Ventures, Inc.
("Acorn") (a  principal  stockholder  of  the  Company),  Cree  A.  Edwards  (an
executive  officer of the Company), entities  affiliated with William C. Edwards
("Edwards Entities")  (a  director of  the  Company; the  Edwards  Entities  are
principal  stockholders of the  Company), the Paul and  Marcia Cook Living Trust
("Cook Trust") (a principal stockholder of the Company and an affiliate of  Paul
M. Cook, Chairman of the Board of Directors of the Company), entities affiliated
with H&Q (affiliates of Nancy E. Pfund, a director of the Company), and entities
affiliated  with  Henry  B.  Sargent ("Sargent  Entities")  (a  director  of the
Company; the Sargent Entities are principal stockholders of the Company)  loaned
the  Company  $500,000,  $133,230, $711,100,  $297,355,  $265,300  and $579,490,
respectively, pursuant to promissory notes due  on demand after October 1,  1993
and bearing interest at the rate of 4% per annum. In connection with the sale of
the  Series BB Preferred Stock, the outstanding balance of principal and accrued
interest under such  promissory notes  was converted  into shares  of Series  BB
Preferred  Stock  at a  conversion  price of  $4.75  per share  and  warrants to
purchase 0.3 shares of  Series BB Preferred  Stock for each  share of Series  BB
Preferred  Stock  issued upon  conversion of  the  promissory notes  and accrued
interest,  such  that   the  Company  issued   and  sold  to   Acorn,  Cree   A.
 
                                       54
<PAGE>
   
Edwards,  the Edwards  Entities, the  Cook Trust,  H&Q and  the Sargent Entities
105,540, 28,380, 151,480,  63,340, 56,470 and  123,600 shares, respectively,  of
Series  BB  Preferred  Stock and  warrants  to purchase  31,662,  8,514, 45,444,
19,002, 16,941 and 37,080  shares, respectively, of  Series BB Preferred  Stock.
The  Company believes  the terms of  these loans  were no less  favorable to the
Company than loans negotiated by such persons with unaffiliated third parties.
    
 
   
    On September 29, 1993, the Company issued and sold 400,000 shares of  Common
Stock  to Acorn, a  stockholder of the Company,  at a price  per share of $0.05.
These shares were granted as part of  a transaction in which Acorn was  required
to  perform consulting  services for the  Company. These shares  were subject to
repurchase by the Company until such rights lapsed in September 1995.
    
 
   
    On June 14, 1995, the Company issued and sold 200,000 shares of Common Stock
to Acorn at a price  per share of $0.50. Acorn  paid cash for the shares.  These
shares  are  subject to  repurchase by  the  Company which  right lapses  over a
five-year period commencing in December 1994.  On August 25, 1995, the terms  of
the  Company's  agreement with  Acorn were  amended  to provide  for accelerated
release of such shares from the Company's repurchase option upon termination  of
such   agreement  other  than  for  cause.  The  transactions  with  Acorn  were
unanimously approved by the Board of Directors of the Company and were on  terms
the  Company believes were no less favorable  than would have been received from
unaffiliated third parties.
    
 
   
    On December  27, 1994  and January  27, 1995,  the Company  issued and  sold
400,000  shares and 800,000 shares, respectively,  of Common Stock to Mr. Seidl,
its President and Chief Executive Officer, at  a price of $0.25 per share  based
on  the early exercise of previously-granted options with an equivalent exercise
price. In connection with the sale of such shares, the Company loaned Mr.  Seidl
$300,000.  The loans are full  recourse, bear interest at  the rate of 7.74% per
annum in the case of $100,000 of principal and at the rate of 7.92% per annum in
the case of $200,000 of principal, are due on the earlier of termination of  Mr.
Seidl's  employment or December 26, 1999 and January 25, 2000, respectively, and
are secured by the shares  of Common Stock purchased  with the proceeds of  such
loans.
    
 
   
    On July 21, 1995, the Company issued and sold 170,000 shares of Common Stock
to  Mr. Mallory, an  executive officer of the  Company, at a  price of $0.50 per
share, based  on the  early  exercise of  a  previously-granted option  with  an
equivalent  exercise  price. In  connection with  the sale  of such  shares, the
Company loaned Mr. Mallory $85,000. The loan is full recourse, bears interest at
the rate  of 6.28%  per annum,  is  due on  the earlier  of termination  of  Mr.
Mallory's  employment or July  21, 2000 and  is secured by  the shares of Common
Stock purchased with the proceeds of such loan.
    
 
   
    On July 31, 1995, the Company issued and sold 180,000 shares of Common Stock
to Mr. Manca, an executive officer of the Company at a price of $0.50 per  share
based  on the early  exercise of a previously-granted  option with an equivalent
exercise price. In connection with the  sale of such shares, the Company  loaned
Mr.  Manca $90,000.  The loan is  full recourse,  bears interest at  the rate of
6.28% per annum, is due on the earlier of termination of Mr. Manca's  employment
or July 31, 2000 and is secured by the shares of Common Stock purchased with the
proceeds of such loan.
    
 
   
    On August 1, 1995, the Company issued and sold 45,110 shares of Common Stock
to  Ronald W. Goodall, a former executive officer of the Company who resigned in
1996, at  a  price  of $0.05  per  share,  based  on the  early  exercise  of  a
previously-granted  option with an equivalent exercise price. On August 1, 1995,
the Company also issued  and sold 144,000, 110,000  and 40,000 shares of  Common
Stock  to Messrs. Jennings, Johnson and Goodall, respectively, each an executive
officer of  the Company,  at a  price  of $0.25  per share  based on  the  early
exercise  of  previously-granted  options with  equivalent  exercise  prices. On
August 1, 1995,  the Company also  issued and sold  155,408, 50,000 and  110,658
shares  of Common Stock  to Messrs. Edwards,  Goodall and Johnson, respectively,
each an executive officer of the Company,  at a price of $0.50 per share,  based
on  the early exercise of previously-granted options with an equivalent exercise
price. In  connection  with the  sale  of  shares, the  Company  loaned  Messrs.
Goodall,  Jennings, Johnson and  Edwards $37,255, $36,000,  $82,829 and $77,704,
respectively. The loans are  full recourse, bear interest  at the rate of  6.04%
per annum, are due on the earlier of termination of employment or August 1, 2000
and  are secured by  the shares of  Common Stock purchased  with the proceeds of
such loans.  Notwithstanding the  foregoing, the  Company agreed  to extend  the
maturity  date  of  the restricted  stock  purchase  loan of  Mr.  Goodall until
December 31,
    
 
                                       55
<PAGE>
   
1996, at which time a balance of $40,455 in principal and accrued interest  will
be  due. The Company will exercise its option to repurchase the unvested portion
of Mr.  Goodall's restricted  stock at  the original  purchase price,  and  such
amount will be credited against the amount of principal and interest due.
    
 
   
    The amounts of outstanding indebtedness, including interest, on the loans to
executive  officers described above as of June  30, 1996, which were the largest
aggregate amount of indebtedness owed by each of the officers at any time,  were
as  follows:  Mr.  Seidl,  $334,315.40,  Mr.  Mallory,  $90,060.13,  Mr.  Manca,
$95,202.94, Mr.  Jennings, $37,995.68,  Mr.  Johnson, $87,420.68,  Mr.  Edwards,
$82,011.57  and Mr. Goodall,  $39,135.83. The terms (including  the terms of the
promissory notes)  of the  sale of  shares of  Common Stock  by the  Company  to
Messrs.  Seidl,  Mallory, Manca,  Jennings,  Johnson, Edwards  and  Goodall were
unanimously approved by the Board of  Directors of the Company. The shares  were
issued upon the early exercise of unvested options and are subject to repurchase
by  the  Company  at the  original  price  paid per  share  upon  such executive
officer's termination  of  employment  prior  to vesting  in  such  shares.  The
repurchase  rights  lapse and  the shares  vest at  the same  rate as  the prior
vesting  schedule  of  the  exercised  options.  See  "Management  --  Executive
Compensation."  The sales price  of each sale  was the fair  market value of the
Company's Common Stock on the original date of grant of each option to  purchase
Common Stock, as determined by the Board of Directors of the Company.
    
 
                                       56
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The  following  table sets  forth  certain information  regarding beneficial
ownership of the Company's Common Stock as of June 30, 1996, and as adjusted  to
reflect the sale of shares offered hereby by (i) each person who is known by the
Company  to own beneficially  more than five  percent of the  Common Stock, (ii)
each of the Named Executive Officers, (iii) each of the Company's directors  and
(iv) all current directors and executive officers as a group.
 
   
<TABLE>
<CAPTION>
                                                                                   SHARES        PERCENT BENEFICIALLY
                                                                                BENEFICIALLY         OWNED (1)(2)
                                                                                  OWNED (1)    ------------------------
                                                                                -------------    BEFORE        AFTER
BENEFICIAL OWNER                                                                   NUMBER       OFFERING     OFFERING
- ------------------------------------------------------------------------------  -------------  -----------  -----------
<S>                                                                             <C>            <C>          <C>
Odyssey Partners, L.P. (3) ...................................................      3,705,952       12.2%         9.1%
 31 West 52nd Street
 New York, NY 10019
Providence Media Partners L.P ................................................      2,162,776        7.2          5.3
 50 Kennedy Plaza
 Providence, R.I. 02903
Paul M. Cook (4) .............................................................      2,132,088        7.0          5.2
 PM Cook Associates
 Bldg. IR-242
 333 Ravenswood Avenue
 Menlo Park, CA 94025
Banner Partners (5) ..........................................................      2,037,912        6.8          5.0
 3000 Sand Hill Road
 Bldg. 1, Suite 190
 Menlo Park, CA 94025
William C. Edwards (6) .......................................................      1,894,228        6.3          4.7
 3000 Sand Hill Road
 Bldg. 1, Suite 190
 Menlo Park, CA 94025
Acorn Ventures, Inc. (7) .....................................................      1,755,400        5.8          4.3
 11400 S.E. Sixth Street, Suite 120
 Bellevue, WA 98004
AT&T Ventures Company, L.P. (8) ..............................................      1,613,476        5.4          4.0
 3000 Sand Hill Road
 Bldg. 4, Suite 235
 Menlo Park, CA 94025
El Dorado Investment Company (9) .............................................      1,603,152        5.4          4.0
 400 E. Van Buren, Suite 750
 Phoenix, AZ 85004
John M. Seidl.................................................................      1,200,000        4.0          3.0
Robert A. Hayes (10)..........................................................        136,000       *            *
James J. Jennings.............................................................        180,000       *            *
Larsh M. Johnson (11).........................................................        416,268        1.4          1.0
Philip H. Mallory.............................................................        170,000       *            *
Neal M. Douglas (12)..........................................................      1,613,476        5.4          4.0
William Hart (13).............................................................        998,914        3.3          2.5
Brian Kwait (3)(14)...........................................................      3,705,952       12.2          9.1
Nancy E. Pfund (15)...........................................................      1,367,202        4.6          3.4
Paul J. Salem (16)............................................................      2,162,776        7.2          5.3
</TABLE>
    
 
                                       57
<PAGE>
   
<TABLE>
<CAPTION>
                                                                                   SHARES        PERCENT BENEFICIALLY
                                                                                BENEFICIALLY         OWNED (1)(2)
                                                                                  OWNED (1)    ------------------------
                                                                                -------------    BEFORE        AFTER
BENEFICIAL OWNER                                                                   NUMBER       OFFERING     OFFERING
- ------------------------------------------------------------------------------  -------------  -----------  -----------
<S>                                                                             <C>            <C>          <C>
Henry B. Sargent (17).........................................................      1,772,866        5.9%         4.4%
All directors and executive officers as a group (16 persons) (18).............     19,569,672       61.6         46.2
</TABLE>
    
 
- ---------
 * Less than 1%
 
   
 (1)  Beneficial  ownership  is  determined in  accordance  with  the  rules and
    regulations of  the Securities  and Exchange  Commission. In  computing  the
    number  of  shares beneficially  owned  by a  person  and the  percentage of
    ownership of  that person,  shares of  Common Stock  subject to  options  or
    warrants  held by that person that  are currently exercisable or exercisable
    within 60  days  of June  30,  1996  are deemed  outstanding.  Such  shares,
    however,  are  not  deemed  outstanding for  the  purpose  of  computing the
    percentage ownership of any  other person. The persons  named in this  table
    have  sole voting and investment power with  respect to all shares of Common
    Stock shown as  beneficially owned  by them, subject  to community  property
    laws where applicable and except as indicated in the other footnotes to this
    table.
    
 
   
 (2)  Percentage  of  beneficial  ownership  before  the  Offering  is  based on
    29,915,164 shares of Common Stock outstanding as of June 30, 1996 and  gives
    effect  to the automatic  conversion of all  outstanding shares of Preferred
    Stock into  Common  Stock.  Percentage of  beneficial  ownership  after  the
    Offering  is based on 40,518,967 shares of Common Stock then outstanding and
    assumes the  exercise of  warrants to  purchase 4,132,970  shares of  Common
    Stock effective upon the closing of this Offering.
    
 
   
 (3)  Includes 580,264  shares issuable  upon the  exercise of  warrants held by
    Odyssey, all of which are assumed to  be exercised upon the closing of  this
    Offering.
    
 
   
 (4) Consists of 1,645,630 shares beneficially owned by the Paul and Marcia Cook
    Living Trust, dated April 21, 1992, 120,000 shares beneficially owned by two
    trusts  of  which Mr.  Cook  is trustee,  328,140  shares issuable  upon the
    exercise of options  exercisable within  60 days  of June  30, 1996,  38,004
    shares  issuable upon the  exercise of warrants  held by the  Paul and Maria
    Cook Living Trust,  dated April 21,  1992, all  of which are  assumed to  be
    exercised  upon the closing  of this Offering, and  314 shares issuable upon
    the exercise of warrants held by Mr. Cook.
    
 
   
 (5) Includes  59,658 shares  issuable upon  the exercise  of warrants  held  by
    Banner  Partners,  of which  59,238  are assumed  to  be exercised  upon the
    closing of this Offering.
    
 
   
 (6) Includes 989,128  shares, 269,192 shares,  and 577,540 shares  beneficially
    owned  by Banner  Partners, Banner Partners/Minaret,  Carson, a partnership,
    and certain  members of  Mr. Edwards's  family and  certain foundations  and
    trusts of which Mr. Edwards is a trustee, respectively. Also includes 29,830
    shares,  7,458  shares,  and 21,080  shares  issuable upon  the  exercise of
    warrants held by Banner Partners, Banner Partners/Minaret, Carson, and  such
    family  members, foundations and trusts, respectively, of which an aggregate
    of 58,158 are assumed to be exercised upon the closing of this Offering. Mr.
    Edwards, a director of the Company, may  be deemed to be a beneficial  owner
    of  shares held by such family  members, foundations and trusts. Mr. Edwards
    and Alan R. Brudos are the general partners of Banner Partners and  exercise
    voting and dispositive power over the shares held by Banner Partners.
    
 
   
 (7)  Includes 136,936  shares issuable  upon the  exercise of  warrants held by
    Acorn, all of which  are assumed to  be exercised upon  the closing of  this
    Offering.  Rufus W.  Lumry is the  principal stockholder,  sole director and
    President of Acorn, and in such capacities exercises voting and  dispositive
    power over the shares held by Acorn.
    
 
   
 (8) Includes 252,632 shares issuable upon the exercise of warrants held by AT&T
    Ventures,  all of which are assumed to be exercised upon the closing of this
    Offering.
    
 
   
 (9) Includes 50,936 shares  issuable upon the exercise  of warrants held by  El
    Dorado, of which 50,682 are assumed to be exercised upon the closing of this
    Offering.
    
 
   
(10)   Consists  of  136,000  shares  issuable  upon  the  exercise  of  options
    exercisable within 60 days of June 30, 1996 held by Mr. Hayes.
    
 
                                       58
<PAGE>
   
(11) Includes 122,650 shares issuable  upon the exercise of options  exercisable
    within 60 days of June 30, 1996 held by Mr. Johnson.
    
 
   
(12)  Consists  of 1,613,476  shares beneficially  owned  by AT&T  Ventures. Mr.
    Douglas, a director of  the Company, is a  general partner of AT&T  Ventures
    and  may be deemed  to be the  beneficial owner of  such shares. Mr. Douglas
    disclaims beneficial ownership  of the shares  except to the  extent of  his
    proportionate partnership interest therein.
    
 
   
(13)  Consists of 971,936 shares beneficially  owned by Technology Partners West
    Fund IV, L.P. and 26,978 shares issuable upon the exercise of warrants  held
    by Technology Partners West Fund IV, L.P., of which 26,838 are assumed to be
    exercised  upon the closing  of this Offering.  Mr. Hart, a  director of the
    Company, is a general partner of Technology Partners and may be deemed to be
    the beneficial owner of such shares. Mr. Hart disclaims beneficial ownership
    of the shares except to the extent of his proportionate partnership interest
    therein.
    
 
   
(14) Consists of 3,705,952  shares beneficially owned by  Odyssey. Mr. Kwait,  a
    director  of the Company, is a principal of  Odyssey and may be deemed to be
    the  beneficial  owner  of  such  shares.  Mr.  Kwait  disclaims  beneficial
    ownership   of  the  shares  except  to  the  extent  of  his  proportionate
    partnership interest therein.
    
 
   
(15) Consists of 11,250 shares beneficially  owned by the Pfund Polakoff  Family
    Trust  Dated  February 18,  1993, 88,945  shares  beneficially owned  by H&Q
    Group, 1,035,888 shares beneficially  owned by H&Q Environmental  Technology
    Fund  and 44,460 shares  beneficially owned by  the Hambrecht 1980 Revocable
    Trust. Also consists of  738 shares issuable upon  the exercise of  warrants
    held  by the  Pfund Polakoff  Family Trust  Dated February  18, 1993, 13,918
    shares issuable upon  the exercise  of warrants  held by  H&Q Group,  79,472
    shares  issuable upon  the exercise  of warrants  held by  H&Q Environmental
    Technology Fund and 3,586 shares issuable upon the exercise of warrants held
    by the Hambrecht 1980 Revocable Trust, of which 97,424 shares are assumed to
    be exercised upon the closing of this Offering. Ms. Pfund, a director of the
    Company, is a general partner of  the H&Q Environmental Technology Fund  and
    an  employee of H&Q Group and may deemed  to be the beneficial owner of such
    shares. Ms. Pfund disclaims beneficial ownership  of the shares held by  H&Q
    Group,  H&Q Environmental Technology  Fund and the  Hambrecht 1980 Revocable
    Trust except to the extent of her proportionate interest therein.
    
 
   
(16) Consists  of  2,162,776  shares  beneficially  owned  by  Providence  Media
    Partners  L.P. ("PMP"). Mr. Salem,  a director of the  Company, is a limited
    partner of  Providence Ventures  L.P., the  general partner  of the  general
    partner  of PMP, and is a vice  president of Providence Ventures Inc., which
    provides investment management  services to  PMP, and  may be  deemed to  be
    beneficial owner of such shares. Mr. Salem disclaims beneficial ownership of
    the  shares except to  the extent of  his proportionate partnership interest
    therein.
    
 
   
(17) Consists  of 4,210  shares  beneficially owned  by Mr.  Sargent,  1,552,216
    shares beneficially owned by El Dorado and 132,940 shares beneficially owned
    by  Sundance Capital Corporation. Also consists  of 842 shares issuable upon
    the exercise of warrants  held by Mr. Sargent,  50,936 shares issuable  upon
    the  exercise of warrants held by El  Dorado and 31,722 shares issuable upon
    the exercise  of warrants  held by  Sundance Capital  Corporation, of  which
    82,404  are assumed to be  exercised upon the closing  of this Offering. Mr.
    Sargent, a  director  of  the Company,  is  President  of El  Dorado  and  a
    principal  of Anderson &  Wells Investment Companies,  which manage Sundance
    Capital Corporation, and may be deemed  to be the beneficial owners of  such
    shares.  Mr. Sargent disclaims beneficial ownership of the shares held by El
    Dorado and Sundance Capital Corporation.
    
 
   
(18) Includes  1,882,674  shares  issuable  upon the  exercise  of  options  and
    warrants exercisable within 60 days of June 30, 1996.
    
 
                                       59
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
   
    Upon  the  closing of  this Offering,  the authorized  capital stock  of the
Company will consist of 50,000,000 shares of Common Stock and 15,000,000  shares
of  Preferred  Stock after  giving  effect to  the  automatic conversion  of all
outstanding shares of Preferred  Stock into Common Stock  and the amendment  and
restatement  of  the  Company's  Certificate  of  Incorporation.  Prior  to this
Offering, there has been  no public market for  the Company's Common Stock.  The
following  summary of certain provisions of the Common Stock and Preferred Stock
does not  purport to  be  complete and  is subject  to,  and qualified  by,  the
provisions  of  the Company's  Restated  Certificate of  Incorporation  which is
included as an exhibit to the Registration Statement of which this Prospectus is
a part, and by the provisions of applicable law.
    
 
COMMON STOCK
 
   
    As  of  June  30,  1996,  there  were  34,048,134  shares  of  Common  Stock
outstanding  which  were held  of  record by  285  stockholders, as  adjusted to
reflect the automatic conversion  of all outstanding  shares of Preferred  Stock
into  24,705,692 shares of Common Stock and  the issuance of 4,132,970 shares of
Common Stock upon the assumed exercise of certain outstanding warrants.
    
 
   
    The holders  of Common  Stock are  entitled to  one vote  per share  on  all
matters  to be voted upon  by the stockholders, except  that, in the election of
directors, the holders  are entitled to  cumulative voting. Under  terms of  the
Shareholders' Agreement, the Company is obligated to nominate for election those
persons  designated by the parties to the Shareholders' Agreement for as long as
the entities having the right to select  such persons continue to hold not  less
than 700,000 shares of Common Stock, as appropriately adjusted for stock splits,
consolidations  or similar  events. The  parties to  the Shareholders' Agreement
have also agreed  to take such  action as is  necessary to retain  the right  of
cumulative  voting  in the  election of  directors  and to  maintain a  Board of
Directors of not  less than  eight directors until  August 15,  1997. See  "Risk
Factors -- Shareholders' Agreement" and "Management -- Board of Directors."
    
 
   
    Subject  to preferences that may be  applicable to any outstanding series of
Preferred Stock, the  holders of Common  Stock are entitled  to receive  ratably
such  dividends, if any,  as may be declared  from time to time  by the board of
directors out  of  funds  legally  available for  that  purpose.  See  "Dividend
Policy."  In  the event  of  a liquidation,  dissolution  or winding  up  of the
Company, the holders of Common Stock are entitled to share ratably in all assets
remaining after payment of liabilities, subject to prior distribution rights  of
Preferred Stock, if any, then outstanding. The Common Stock has no preemptive or
conversion  rights or  other subscription rights.  However, certain stockholders
have certain contractual pre-emptive and  subscription rights. See "--Rights  of
First  Refusal" and  "--Other Rights." There  are no redemption  or sinking fund
provisions applicable  to the  Common Stock.  All outstanding  shares of  Common
Stock  are fully paid and non-assessable, and the shares of Common Stock offered
hereby  will,  upon   the  closing  of   this  Offering,  be   fully  paid   and
non-assessable.
    
 
PREFERRED STOCK
 
    Effective  upon the closing of this Offering, the Company will be authorized
to issue 15,000,000 shares of undesignated  Preferred Stock, none of which  will
be  outstanding. The Board of Directors will have the authority, without further
action by the stockholders, to issue the undesignated Preferred Stock in one  or
more series, to fix the rights, preferences, privileges and restrictions granted
to  or imposed upon  any wholly unissued shares  of undesignated Preferred Stock
and to fix the number of shares  constituting any series and the designation  of
such  series. The issuance of  Preferred Stock may have  the effect of delaying,
deferring or  preventing a  change in  control of  the Company  without  further
action  by the stockholders, may discourage  bids for the Company's Common Stock
at a premium over the market price of the Common Stock and may adversely  affect
the  market price of  and the voting and  other rights of  the holders of Common
Stock. At present, the Company has no plans to issue any Preferred Stock.
 
WARRANTS
 
   
    Upon the  closing  of  this  Offering, the  Company  will  have  outstanding
warrants to purchase an aggregate of 50,914 shares of Common Stock, after giving
effect to an assumed exercise of warrants to purchase 4,132,970 shares of Common
Stock.  Such outstanding warrants consist of  warrants to purchase 50,000 shares
    
 
                                       60
<PAGE>
   
of Common Stock at an exercise price of $2.00 per share (the "$2.00  Warrants"),
warrants  to purchase an aggregate of 150  shares of Common Stock at an exercise
price of $20.00 per  share (the "$20.00 Warrants")  and warrants to purchase  an
aggregate  of 764  shares of Common  Stock at  an exercise price  of $126.92 per
share (the  "$126.92 Warrants").  40,000  of the  $2.00 Warrants  are  currently
exercisable,  and the remaining 10,000 $2.00 Warrants will become exercisable on
August 21, 1997. The $2.00 Warrants will expire on February 24, 1999. The $20.00
Warrants are currently  exercisable and  will expire  on February  6, 1997.  The
$126.92  warrants are currently exercisable and  will expire at various dates in
December 1996.
    
 
   
    In addition, the Company has  outstanding warrants to purchase an  aggregate
of  2,600,000 shares of  Common Stock at  an exercise price  of $0.005 per share
(the "Note Warrants"), which  Note Warrants were issued  in connection with  the
issuance  of the Senior Discount Notes, and warrants to purchase an aggregate of
766,485 shares of Series BB  Preferred Stock at an  exercise price of $4.75  per
share  (the  "Preferred  Warrants"),  which Preferred  Warrants  were  issued in
connection with the issuance of the Series BB Preferred Stock. The Note Warrants
will expire 90 days after  the closing date of  this Offering and the  Preferred
Warrants  will expire  immediately prior to  the closing of  this Offering. This
Prospectus assumes that each of the Note Warrants and Preferred Warrants will be
exercised upon the closing of this Offering.
    
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
   
    After this Offering, the  holders of 28,188,916 shares  of Common Stock  and
warrants  to purchase  1,532,970 shares  of Common  Stock (assuming  no cashless
exercise of such  warrants) and their  transferees will be  entitled to  certain
rights  with respect to the registration of such shares under the Securities Act
pursuant to the Shareholders' Agreement.  Under the Shareholders' Agreement,  if
the Company proposes to register any of its securities under the Securities Act,
the  holders  are  entitled to  notice  of  such proposed  registration  and the
opportunity to include their shares  therein, subject to certain conditions  and
limitations  including the right of the underwriters of an offering to limit the
number of shares included  in such registration  to 25% of  the total number  of
shares  to be registered in certain  circumstances. The holders may also require
that the Company file up to two registration statements under the Securities Act
with respect  to underwritten  public  offerings of  their  shares at  any  time
beginning  180 days after the effective  date of this Offering. Furthermore, the
holders may require the Company to register  their shares on Form S-3 when  such
form becomes available to the Company. In addition, holders who purchased Series
CC  Preferred Stock are  entitled to initiate  two separate demand registrations
with respect to an  underwritten public offering of  the shares of Common  Stock
issuable  upon conversion of the Series CC Preferred Stock at any time beginning
180 days after  the effective date  of this Offering,  subject to certain  other
conditions  and limitations. Other holders may participate in such registration,
provided that in  the event of  an underwriter's cutback,  the number of  shares
that  may  be  included  in  such  registration  would  be  subject  to  certain
allocations. The  Company  will pay  certain  expenses in  connection  with  the
exercise  of the foregoing rights. All  registration rights will terminate as to
any holder upon the later to occur of  (i) one year after this Offering or  (ii)
such  time as such holder may  sell all his or her  shares under Rule 144 in any
three month period.
    
 
   
    The Company is required to cause the offer and sale of the 2,600,000  shares
of  Common Stock issuable upon exercise of  the Note Warrants (the "Note Warrant
Shares") to be registered  under the Securities  Act prior to  the date of  this
Prospectus  subject  to  a 90-day  lock-up  agreement  as discussed  below  . In
addition, the holders of Note Warrant Shares will be entitled to certain  rights
with  respect to the registration of such shares for resale to the public. Under
a Warrant Registration Rights Agreement dated June 15, 1995, as supplemented  on
November  21,  1995 (the  "Warrant Registration  Rights Agreement"),  after this
Offering the holders of Note Warrants may require, subject to the provisions  of
certain  lockup  agreements,  that the  Company  file up  to  three registration
statements under the  Securities Act with  respect to the  Note Warrant  Shares.
Furthermore,  the holders may  require the Company to  register the Note Warrant
Shares on a Form S-3 when such form becomes available to the Company, subject to
certain conditions and limitations. If the  Company proposes to register any  of
its  securities under the Securities Act, either  for its own account or for the
account of other security  holders, the holders of  the Note Warrant Shares  are
entitled to notice of such registration and are entitled to include their shares
therein,  subject to certain  conditions and limitations  including the right of
underwriters of  an offering  to limit  the number  of shares  included in  such
registration  in certain circumstances. The Company will pay certain expenses in
connection with the exercise of the
    
 
                                       61
<PAGE>
foregoing rights.  The holders  of the  Note  Warrant Shares  are subject  to  a
lock-up  agreement  for 90  days  following the  closing  of this  Offering. The
registration rights of  the holders of  the Note Warrant  Shares terminate  when
such  shares  may be  sold without  limitation  pursuant to  Rule 144  under the
Securities Act.
 
   
    The Company has  also agreed to  register up  to one half  of the  1,470,833
shares  of Common Stock purchased  by NSP and UE  in the Utility Stock Purchases
upon request at any time after one year from the closing of the Offering.
    
 
   
RIGHTS OF FIRST REFUSAL
    
 
   
    Under the Shareholders' Agreement, holders who purchased Series CC Preferred
Stock have a right of  first refusal to purchase, at  the same price and on  the
same  general terms, a  pro rata portion  of equity securities  that the Company
proposes to issue in certain transactions, including equity securities  proposed
to  be issued to any public or private  utility or an affiliate of such utility,
and have a right of first refusal to  purchase a pro rata portion of any  equity
securities that any subsidiary of the Company proposes to issue to any public or
private  utility or an affiliate of such utility if the subsidiary's business is
unrelated to  the  market  area  of  such utility  or  if  such  securities  are
convertible  into equity  securities of  the Company.  Such pro  rata portion is
based on the ratio of the number of  shares of Common Stock held by such  holder
to the total number of shares of Common Stock then outstanding, including shares
of  Common  Stock issuable  upon  the exercise  of  "in the  money"  options and
warrants, at the time of issuance of such equity securities. This right of first
refusal terminates three years after the closing date of this Offering.
    
 
OTHER RIGHTS
 
    Under the  Shareholders' Agreement,  the investors  in Series  CC  Preferred
Stock have the right to co-invest on similar terms and conditions in any foreign
investments, partnerships, or joint ventures involving the Company which include
financing  from purely financial  (as compared to  strategic) investors. The co-
investment rights terminate three years after the closing date of this Offering.
 
    Under the Shareholders' Agreement, in the event that any holder of shares of
the Company's equity  securities who  is a party  to such  agreement intends  to
transfer  (other than to  an affiliate) any such  shares to a  buyer who owns or
will acquire as a result of  the sale voting stock equal  to 20% or more of  the
Company's  outstanding  equity  securities,  the  parties  to  the Shareholders'
Agreement will have the right to sell a pro rata portion of their shares to  the
buyer  in  such transaction.  In  the event  that any  holder  of shares  of the
Company's equity  securities  who is  a  party to  the  Shareholders'  Agreement
intends  to acquire (other than from  an affiliate) additional voting stock, and
such holder owns or will acquire as a result of such purchase 20% or more of the
Company's voting stock, the parties to the Shareholders' Agreement also have the
right to sell to such purchasing holder  a pro rata portion of the voting  stock
proposed to be acquired in such transaction. This co-sale right terminates three
years after the closing date of this Offering.
 
   
    In  addition, NSP has a  right to participate in  future public offerings of
newly issued shares  of Common Stock  by the  Company. NSP will  be entitled  to
purchase  a pro rata portion of the shares that the Company proposes to offer to
the public based on the  ratio of the number of  shares purchased by NSP in  the
Utility  Stock Purchase  and owned on  the date  of such public  offering to the
total number of shares of Common Stock then outstanding before giving effect  to
such  public offering. However, NSP may not exercise such participation right to
the extent that NSP's  percentage ownership of the  Common Stock after such  new
offering  would exceed the percentage ownership of  NSP upon the closing of this
Offering (after giving effect to the release of any Escrow Shares to NSP). NSP's
participation shall be on the same terms and conditions as the public  investors
in  such public offering.  NSP's participation right  terminates two years after
the effective date of this Offering.
    
 
CERTAIN PROVISIONS OF DELAWARE LAW
 
    The Company is  a Delaware  corporation and subject  to Section  203 of  the
Delaware  General Corporation Law, an anti-takeover law. In general, Section 203
prohibits a  publicly held  Delaware corporation  from engaging  in a  "business
combination"  with  an  "interested stockholder"  for  a period  of  three years
following the date  the person  became an interested  stockholder, unless  (with
certain  exceptions) the "business combination" or  the transaction in which the
person became an interested stockholder is approved in a
 
                                       62
<PAGE>
prescribed manner. Generally, a "business combination" includes a merger,  asset
or  stock sale,  or other  transaction resulting in  a financial  benefit to the
stockholder. Generally, an  "interested stockholder" is  a person who,  together
with  affiliates and associates, owns (or within three years prior, did own) 15%
or more of a corporation's voting  stock. The existence of this provision  would
be  expected to  have an anti-takeover  effect with respect  to transactions not
approved in advance by the  Board of Directors, including discouraging  attempts
that  might result in a  premium over the market price  for the shares of Common
Stock held by stockholders.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer agent and  registrar for the  Common Stock is  The Bank of  New
York.
 
                                       63
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
    Upon  the completion of  this Offering and the  Utility Stock Purchases, the
Company will have 40,518,967  shares of Common  Stock outstanding, after  giving
effect  to  the assumed  exercise of  warrants to  purchase 4,132,970  shares of
Common Stock. Of these shares, the  5,000,000 shares sold in this Offering  will
be  freely tradable without restriction under the Securities Act, unless held by
"affiliates" of the  Company, as  that term  is defined  in Rule  144 under  the
Securities Act. The remaining 35,518,967 shares of Common Stock held by existing
stockholders  and by NSP and UE were issued  and sold by the Company in reliance
on exemptions from the registration requirements  of the Securities Act and  are
"restricted"  securities within the meaning of Rule 144 under the Securities Act
("Restricted Shares"). Restricted Shares may be  sold in the public market  only
if  registered, or pursuant to an exemption from registration such as Rules 144,
144(k) or 701 under the  Securities Act. Sales of  the Restricted Shares in  the
public  market, or  the availability  of such  shares for  sale, could adversely
affect the market price of the Common Stock.
    
 
   
    All of the Company's directors, officers and holders of five percent or more
of the Common Stock,  and certain other stockholders,  have entered into  lockup
agreements under which they have agreed not to offer, sell, or otherwise dispose
of  any shares of Common Stock, options  or warrants to acquire shares of Common
Stock or securities exercisable or  exchangeable for or convertible into  Common
Stock  owned by them for a period of 180 days after the date of this Prospectus,
without the prior  written consent  of Morgan  Stanley &  Co. Incorporated.  The
Company  has entered into a similar agreement, except that the Company may grant
options and issue  shares of  Common Stock under  its current  stock option  and
stock  purchase plans and  pursuant to other  currently outstanding options. The
holders of 2,600,000 Note  Warrant Shares have  entered into similar  agreements
which  are applicable for a period of 90 days after the date of this Prospectus,
and the holders  of 2,839,906  shares of Common  Stock issued  or issuable  upon
exercise  of  options granted  under  the 1992  Plan  have entered  into similar
agreements which are applicable for a period of 120 days after the date of  this
Prospectus. See "Underwriters."
    
 
   
    Under the agreements related to the Utility Stock Purchases, NSP and UE have
agreed  not to directly or indirectly sell  or transfer 735,417 of the aggregate
number of  shares  of  Common Stock  purchased  by  them in  the  Utility  Stock
Purchases for a period of one year from the effective date of this Offering, and
not  to directly or indirectly sell or  transfer the remaining 735,417 shares of
Common Stock purchased by them  in the Utility Stock  Purchases for a period  of
two  years from the effective date of this Offering. Upon expiration of such two
year period, all of  such shares will be  eligible for immediate public  resale,
subject  to the provisions of Rule 144. In addition, the Company has also agreed
to register up to one half of the 1,470,833 shares of Common Stock purchased  by
NSP  and UE in  the Utility Stock Purchases  upon request at  any time after one
year from the closing of the Offering.
    
 
   
    Upon expiration of the applicable  180 day lockup agreements,  approximately
26,420,242 such shares of Common Stock will become eligible for immediate public
resale,  subject  in some  cases to  the  limitations imposed  by Rule  144. The
remaining approximately 654,650 shares held by existing stockholders will become
eligible for public resale at various  times beginning after 180 days after  the
date  of this Prospectus and subject to the provisions of Rule 144. In addition,
approximately 2,839,906 shares  of Common  Stock, subject to  the provisions  of
Rule  701, and 2,137,754 shares subject to  vested options will be available for
sale in the public market,  in each case, 120 days  after the effective date  of
the Offering.
    
 
   
    The   holders  of   approximately  28,188,916  of   the  shares  outstanding
immediately following the completion  of this Offering  and 4,132,970 shares  of
Common  Stock issuable upon exercise of outstanding warrants and their permitted
transferees are entitled  to certain  registration rights with  respect to  such
shares  upon the expiration of the lockup agreements described above. The number
of shares sold in the public  market could increase if such registration  rights
are  exercised.  See "Description  of Capital  Stock  -- Registration  Rights of
Certain Holders."  In addition,  as  of June  30,  1996, 3,779,136  shares  were
subject  to outstanding options. All  of these shares are  subject to the lockup
agreements described  above. As  soon as  practicable after  this Offering,  the
Company  intends to  file a Registration  Statement on Form  S-8 covering shares
issuable under the Company's 1992 Plan  and 1994 Plan (including shares  subject
to  then outstanding options under such plans), and under the Company's Purchase
Plan,  thus  permitting  the  resale   of  such  shares  by  non-affiliates   in
    
 
                                       64
<PAGE>
   
the  public market without restriction under the Securities Act after expiration
of the applicable lock-up agreements. See "Management -- Incentive Stock Plans."
The Company is also required to cause  the offer and sale of the 2,600,000  Note
Warrant  Shares to  be registered under  the Securities  Act on or  prior to the
effective date of this Offering if legally permissible.
    
 
   
    In general, under  Rule 144  as currently in  effect, a  person (or  persons
whose shares are aggregated) who has beneficially owned Restricted Shares for at
least  two years  (including the  holding period of  any prior  owner, except an
affiliate) is entitled to sell within any three-month period commencing 90  days
after  the date of this Prospectus, a number  of shares that does not exceed the
greater of  (i)  one percent  of  the number  of  shares of  Common  Stock  then
outstanding  (approximately 405,190  shares immediately after  this Offering) or
(ii) the  average weekly  trading volume  of the  Common Stock  during the  four
calendar  weeks preceding the required filing of a Form 144 with respect to such
sale. Sales  under Rule  144 are  generally subject  to certain  manner of  sale
provisions  and notice  requirements and to  the availability  of current public
information about the Company. Under Rule 144(k), a person who is not deemed  to
have been an affiliate of the Company at any time during the 90 days preceding a
sale, and who has beneficially owned the shares proposed to be sold for at least
three  years, is entitled to sell such  shares without having to comply with the
manner of sale, public  information, volume limitation  or notice provisions  of
Rule  144.  Under Rule  701 under  the Securities  Act, employees,  directors or
consultants who purchase shares  upon exercise of options  granted prior to  the
effective  date of this Offering are entitled  to sell such shares commencing 90
days after the effective date of this Offering in reliance on Rule 144,  without
having  to comply with the  holding period requirements of  Rule 144 and, in the
case of non-affiliates, without  having to comply  with the public  information,
volume limitation or notice provisions of Rule 144.
    
 
    The  Securities and Exchange  Commission has recently  proposed reducing the
initial Rule 144 holding period to one  year and the Rule 144(k) holding  period
to  two years. There can be no assurance as to when or whether such rule changes
will be enacted. If enacted, such  modifications will have a material effect  on
the times when shares of the Company's Common Stock become eligible for resale.
 
    Prior to this Offering, there has been no public market for the Common Stock
and  no  prediction  can  be made  of  the  effect,  if any,  that  the  sale or
availability for sale  of shares  of additional Common  Stock will  have on  the
market  price of the Common Stock. Nevertheless, sales of substantial amounts of
such shares in the public market, or the perception that such sales could occur,
could materially and adversely affect the  market price of the Common Stock  and
could  impair the Company's future ability  to raise capital through an offering
of its equity securities.
 
                                       65
<PAGE>
                                  UNDERWRITERS
 
    Under  the  terms and  subject to  conditions  contained in  an Underwriting
Agreement dated  the  date hereof  (the  "Underwriting Agreement")  ,  the  U.S.
Underwriters  named below, for  whom Morgan Stanley &  Co. Incorporated, Cowen &
Company, Montgomery  Securities  and  Smith  Barney  Inc.  are  acting  as  U.S.
Representatives, and the International Underwriters named below, for whom Morgan
Stanley  & Co. International Limited, Cowen & Company, Montgomery Securities and
Smith Barney Inc.  are acting as  International Representatives, have  severally
agreed  to purchase, and the  Company has agreed to  sell to them severally, the
respective number of shares of Common Stock set forth opposite the names of each
Underwriter below.
 
   
<TABLE>
<CAPTION>
                                                                                                       NUMBER OF
NAME                                                                                                     SHARES
- -----------------------------------------------------------------------------------------------------  ----------
<S>                                                                                                    <C>
U.S. Underwriters:
  Morgan Stanley & Co. Incorporated..................................................................
  Cowen & Company....................................................................................
  Montgomery Securities..............................................................................
  Smith Barney Inc...................................................................................
 
                                                                                                       ----------
 
      Subtotal.......................................................................................   4,000,000
                                                                                                       ----------
 
International Underwriters:
  Morgan Stanley & Co. International Limited.........................................................
  Cowen & Company....................................................................................
  Montgomery Securities..............................................................................
  Smith Barney Inc...................................................................................
 
                                                                                                       ----------
 
      Subtotal.......................................................................................   1,000,000
                                                                                                       ----------
          Total......................................................................................   5,000,000
                                                                                                       ----------
                                                                                                       ----------
</TABLE>
    
 
    The U.S. Underwriters  and the International  Underwriters are  collectively
referred  to  as  the  "Underwriters,"  and  the  U.S.  Representatives  and the
International   Representatives   are   collectively   referred   to   as    the
"Representatives."  The Underwriting Agreement provides  that the obligations of
the Underwriters to pay for  and accept delivery of  the shares of Common  Stock
offered  hereby are subject  to the approval  of certain legal  matters by their
counsel and to certain other conditions. The Underwriters are obligated to  take
and  pay for all of the shares of  Common Stock offered hereby (other than those
covered by the U.S. Underwriters' over-allotment option described below) if  any
such shares are taken.
 
    Pursuant  to the Agreement between U.S. and International Underwriters, each
U.S. Underwriter has represented and  agreed that, with certain exceptions:  (a)
it  is not  purchasing any U.S.  Shares (as  defined herein) for  the account of
anyone other than a United States or Canadian Person (as defined herein) and (b)
it has not offered or sold, and will not offer or sell, directly or  indirectly,
any U.S. Shares or distribute any prospectus relating to the U.S. Shares outside
of  the United  States or  Canada or  to anyone  other than  a United  States or
Canadian Person.  Pursuant  to  the Agreement  between  U.S.  and  International
Underwriters,  each International  Underwriter has represented  and agreed that,
with certain exceptions: (i) it is  not purchasing any International Shares  (as
defined herein) for the account of any United States or Canadian Person and (ii)
it  has not offered or sold, and will not offer or sell, directly or indirectly,
any  International  Shares  or  distribute   any  prospectus  relating  to   the
International  Shares in the  United States or  in any province  or territory of
Canada or to any United States or Canadian Person. The foregoing limitations  do
 
                                       66
<PAGE>
not  apply  to  stabilization  transactions  or  to  certain  other transactions
specified in the Agreement between U.S. and International Underwriters. As  used
herein, "United States or Canadian Person" means any national or resident of the
United  States or of  any province or  territory of Canada,  or any corporation,
pension, profit-sharing or other trust or other entity organized under the  laws
of  the United States or  Canada or of any  political subdivision thereof (other
than a branch located outside the United States and Canada of any United  States
or  Canadian Person)  and includes  any United  States or  Canadian branch  of a
person who is otherwise not  a United States or  Canadian Person. All shares  of
Common  Stock to  be purchased  by the  U.S. Underwriters  and the International
Underwriters are referred to herein as the "U.S. Shares" and the  "International
Shares," respectively.
 
    Pursuant to the Agreement between U.S. and International Underwriters, sales
may  be made between the U.S. Underwriters and International Underwriters of any
number of shares of  Common Stock to be  purchased pursuant to the  Underwriting
Agreement  as may  be mutually agreed.  The per  share price of  any shares sold
shall be the  Price to  Public set  forth on the  cover page  hereof, in  United
States  dollars, less  an amount not  greater than  the per share  amount of the
concession to dealers set forth below.
 
    Pursuant to the Agreement between U.S. and International Underwriters,  each
U.S. Underwriter has represented that it has not offered or sold, and has agreed
not to offer or sell, any shares of common stock, directly or indirectly, in any
province  or territory of Canada in contravention of the securities laws thereof
and has represented that any offer of  Common stock in Canada will be made  only
pursuant  to  an exemption  from the  requirement  to file  a prospectus  in the
province or  territory  of  Canada  in  which such  offer  is  made.  Each  U.S.
Underwriter  has further agreed to send to  any dealer who purchases from it any
shares of Common Stock  a notice stating in  substance that, by purchasing  such
Common Stock, such dealer represents and agrees that it has not offered or sold,
and  will not offer or sell, directly or indirectly, any of such Common Stock in
any province or territory of Canada or  to, or for the benefit of, any  resident
of  any province or territory of Canada  in contravention of the securities laws
thereof and that any offer of Common Stock in Canada will be made only  pursuant
to  an exemption from  the requirement to  file a prospectus  in the province or
territory of Canada  in which  such offer  is made,  and that  such dealer  will
deliver  to any other dealer to whom it  sells any of such Common Stock a notice
to the foregoing effect.
 
    Pursuant to the Agreement between U.S. and International Underwriters,  each
International Underwriter has represented and agreed that (i) it has not offered
or sold and during the period of six months after the date hereof will not offer
to  sell any shares of  Common Stock to persons in  the United Kingdom except to
persons whose ordinary activities involve  them in acquiring, holding,  managing
or  disposing of investments (as  principal or agent) for  the purposes of their
business or otherwise  in circumstances  which have  not resulted  and will  not
result in an offer to the public in the United Kingdom within the meaning of the
Public  Offers of Securities Regulations 1995  (the "U.K. Regulations"); (ii) it
has complied and  will comply with  all applicable provisions  of the  Financial
Services  Act  1986 and  the U.K.  Regulations (to  the extent  applicable) with
respect to anything done by it in relation to the shares of Common Stock offered
hereby in, from or otherwise involving the United Kingdom; and (iii) it has only
issued or passed on and will only issue  or pass on to any person in the  United
Kingdom  any document received by it in  connection with the issue of the shares
of Common Stock, other  than any document  which consists of, or  is a part  of,
listing  particulars, supplementary  listing particulars  or any  other document
required or permitted to be published by  listing rules under Article IV of  the
Financial  Services Act 1986, if  that person is of  a kind described in Article
11(3)  of   the  Financial   Services  Act   1986  (Investment   Advertisements)
(Exemptions)  Order 1995,  or is  a person  to whom  the document  may otherwise
lawfully be issued or passed on.
 
    The Underwriters initially  propose to offer  part of the  shares of  Common
Stock  offered hereby directly to the public at the Price to Public set forth on
the cover page of this  Prospectus and part to certain  dealers at a price  that
represents  a concession not in excess of $            per share under the Price
to Public.  The  Underwriters  may  allow,  and  such  dealers  may  reallow,  a
concession  not in excess of $             per share to other Underwriters or to
certain other dealers. After the initial offering of the shares of Common Stock,
the offering price and other  selling terms may from time  to time be varied  by
the Representatives.
 
                                       67
<PAGE>
   
    Pursuant  to the Underwriting Agreement, the Company has granted to the U.S.
Underwriters  an  option,  exercisable  for  30  days  from  the  date  of  this
Prospectus,  to purchase up to 750,000 additional  shares of Common Stock at the
Price to Public set forth on the cover page hereof, less underwriting  discounts
and  commissions. To the extent such  option is exercised, each U.S. Underwriter
will become obligated, subject to certain conditions, to purchase  approximately
the  same percentage of such additional shares of Common Stock as the number set
forth next to such U.S. Underwriter's name  in the preceding table bears to  the
total number of U.S. Shares offered by the U.S. Underwriters hereby.
    
 
    The   Company  and  each  of  its  officers,  directors  and  certain  other
stockholders have  agreed  that without  the  prior written  consent  of  Morgan
Stanley  & Co.  Incorporated on  behalf of the  Underwriters, they  will not (i)
register for sale, make any demand for or extend any right with respect to  such
registration,  issue, offer, pledge, sell, contract  to sell, sell any option or
contract to purchase, purchase any option or contract to sell, grant any option,
right or warrant to  purchase or otherwise transfer  or dispose of, directly  or
indirectly,  any shares  of Common Stock  or any securities  convertible into or
exercisable or exchangeable for  Common Stock (whether such  shares or any  such
securities  are now owned or are acquired  after the date of this Prospectus) or
(ii) enter into any  swap or similar  agreement that transfers,  in whole or  in
part, any of the economic consequences of ownership of the Common Stock, whether
any  such transaction described in clause (i) or  (ii) above is to be settled by
delivery of Common Stock or  such other securities, in  cash or otherwise for  a
period  of 180 days after the date of this Prospectus, other than (x) the shares
of Common Stock to be sold hereunder,  (y) any shares of Common Stock issued  by
the  Company upon the exercise of options  issued pursuant to the Company's 1992
Plan or 1994 Plan, pursuant to the  Company's Purchase Plan or upon exercise  of
outstanding  warrants and  (z) the  issuance of  additional options  to purchase
shares of  Common Stock  pursuant to  the Company's  1994 Plan.  The holders  of
substantially  all remaining shares have entered into agreements restricting the
sale or other disposition of Common Stock which are applicable for a periods  of
90  to 180  days after  the date  of this  Prospectus. See  "Shares Eligible for
Future Sale."
 
    The Company has agreed to indemnify the several Underwriters against certain
liabilities, including liabilities under the Securities Act.
 
    The Underwriters have informed the Company that they do not intend sales  to
discretionary  accounts to  exceed 5%  of the total  number of  shares of Common
Stock offered by them.
 
   
    At the request of the Company, the Underwriters have reserved  approximately
250,000  shares of Common Stock,  representing 5.0% of the  Shares to be sold in
the Offering, for sale to its  non-employee directors and certain other  persons
at the initial public offering price set forth on the cover page hereof. If such
shares are not so sold to such persons, they will be sold to the public.
    
 
    Smith  Barney Inc.  acted as  the initial  purchaser of  the Senior Discount
Notes and received customary compensation in connection therewith.
 
PRICING OF THE OFFERING
 
    Prior to  this offering,  there has  been no  public market  for the  Common
Stock.  The initial  public offering  price will  be determined  by negotiations
between the Company and the Representatives. Among the factors to be  considered
in determining the initial public offering price will be the future prospects of
the  Company  and its  industry in  general; sales,  earnings and  certain other
financial and  operating  information of  the  Company in  recent  periods;  and
certain  ratios  and  market  prices of  securities  and  certain  financial and
operating information of companies engaged in activities similar to those of the
Company. The estimated  initial public  offering price  range set  forth on  the
cover  page of this Preliminary  Prospectus is subject to  change as a result of
market conditions and other factors.
 
                                       68
<PAGE>
                                 LEGAL MATTERS
 
   
    The validity of the Common Stock offered hereby will be passed upon for  the
Company  by  Wilson Sonsini  Goodrich &  Rosati, Professional  Corporation, Palo
Alto, California. As of the date  of this Prospectus, certain members of  Wilson
Sonsini  Goodrich & Rosati, Professional Corporation and investment partnerships
of which  such  persons are  partners  beneficially  own 20,528  shares  of  the
Company's  Common Stock. Certain legal matters  in connection with this Offering
will be  passed  upon  for  the  Company  by  Fish  &  Richardson,  Menlo  Park,
California,  and by Wilkinson, Barker, Knauer & Quinn, Washington, D.C., and for
the Underwriters by Shearman & Sterling, New York, New York.
    
 
                                    EXPERTS
 
    The consolidated financial statements as of  December 31, 1994 and 1995  and
for  each of the three  years in the period ended  December 31, 1995 included in
this Prospectus and the related financial statement schedule appearing elsewhere
in this  Registration Statement  have been  audited by  Deloitte &  Touche  LLP,
independent  auditors,  as stated  in their  reports  appearing herein,  and are
included in reliance upon the reports of such firm given upon their authority as
experts in accounting and auditing.
 
                             ADDITIONAL INFORMATION
 
   
    The Company  has filed  with  the Securities  and Exchange  Commission  (the
"Commission")  a Registration Statement on Form S-1 under the Securities Act, of
which this Prospectus forms a part, with  respect to the shares of Common  Stock
offered  hereby. This Prospectus does not  contain all the information set forth
in the  Registration  Statement and  the  exhibits and  schedules  thereto.  For
further  information with  respect to the  Company and the  Common Stock offered
hereby, reference is made to the Registration Statement and to the exhibits  and
schedules  filed therewith.  Statements contained in  this Prospectus  as to the
contents of  any contract  or other  document referred  to are  not  necessarily
complete, and in each instance reference is made to the copy of such contract or
other  document filed  as an  exhibit to  the Registration  Statement, each such
statement being  qualified  by  such  reference.  A  copy  of  the  Registration
Statement,  including exhibits and  schedules thereto, may  be inspected without
charge at the public reference facilities  maintained by the Commission at  Room
1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
regional  offices of the Commission located at 7 World Trade Center, Suite 1300,
New York, New  York 10048 and  Citicorp Center, 500  West Madison Street,  Suite
1400, Chicago, Illinois 60661. Copies of such materials may be obtained from the
Public  Reference Section  of the  Commission, Room  1024, Judiciary  Plaza, 450
Fifth Street, N.W., Washington, D.C. 20549, and its public reference  facilities
in New York, New York and Chicago, Illinois, at prescribed rates. The Commission
maintains  a World  Wide Web site  that contains reports,  proxy and information
statements and other information regarding registrants that file  electronically
with the Commission. The address of the site is http://www.sec.gov.
    
 
    The  Company  intends  to  furnish  its  stockholders  with  annual  reports
containing consolidated financial statements audited by its independent auditors
and with quarterly reports containing  unaudited financial information for  each
of the first three quarters of each fiscal year.
 
                                       69
<PAGE>
                                    GLOSSARY
 
   
<TABLE>
<CAPTION>
TERM                              DEFINITION
- --------------------------------  --------------------------------------------------------------------------------
<S>                               <C>
APPLICATIONS                      Software programs that enable computers to perform tasks such as, in the case of
                                  utility applications, metering, load management, load research, and distribution
                                  automation.
 
AUTOMATED METER READING ("AMR")   Use of hand-held or drive-by automated meter reading equipment.
 
BANDWIDTH                         The amount of message traffic a given medium can accommodate at one time.
                                  Bandwidth may refer to analog or digital data.
 
CAPACITY                          For electric utility purposes, a measure (in watts) of the ability to produce,
                                  transport or store electricity at any instant rather than over time.
 
CELLMASTER                        The communications gateway between the System Controller and the MCCs and RTUs.
                                  The CellMaster can connect to the System Controller via modem over a leased line
                                  or via privately-owned communications media such as microwave channels or fiber
                                  optic transmission lines. CellNet's 9QPR cellular radio provides the connection
                                  between the CellMaster and the MCCs and RTUs.
 
CELLNET-REGISTERED TRADEMARK-     CellNet's wireless data communications system, which provides NMR services,
SYSTEM                            control and monitoring of the power distribution network, and other services.
                                  The CellNet system concurrently supports multiple utility applications,
                                  including distribution automation and demand-side management.
 
CELLULAR DIGITAL PACKET DATA      A method of transmitting data over a cellular communications network using
("CDPD")                          underutilized radio frequency or pauses in voice communication.
 
DEMAND                            For electric utility purposes, the rate at which electric energy is delivered to
                                  or used by a system, part of a system, or piece of equipment at a given instant,
                                  or averaged over a designated period. Measured in kilowatts.
 
DISTRIBUTION AUTOMATION           Any program used by an electric utility to monitor, coordinate and operate
                                  distribution components in a real-time mode from remote locations.
 
DISTRIBUTION NETWORK              The utility's wiring grid between the substation and customer sites.
 
GATEWAY                           The connection between two computer networks. CellNet uses a gateway to connect
                                  a SCADA system to other computers for billing and other applications.
 
LEASED LINE                       A dedicated telephone line connecting two or more fixed locations. CellNet may
                                  use a leased line or radio links to connect a CellMaster and System Controller.
 
LOAD                              For electric utility purposes, the amount of electric power delivered or
                                  required at any specific point or points of a system.
 
LOAD CONTROL                      The capability to manage electric power consumption by controlling the use of
                                  equipment and appliances. Typically used by a utility to avoid either a brownout
                                  or the necessity of generating high-cost electricity.
</TABLE>
    
 
                                      A-1
<PAGE>
   
<TABLE>
<CAPTION>
TERM                              DEFINITION
- --------------------------------  --------------------------------------------------------------------------------
<S>                               <C>
LOAD PROFILE                      A record of a customer's electricity use over time in discrete intervals.
                                  Utility companies use this data to analyze consumption, to calculate demand or
                                  time-of-use data and to detect power theft and meter tampering.
 
LOCAL AREA NETWORK ("LAN")        In the CellNet system, the LAN connects MCCs to radios in endpoint devices.
 
MAS                               Multiple address system, a form of radio communication system.
 
MICRO CELL CONTROLLER ("MCC")     A device which manages endpoint devices in a local coverage area (as part of a
                                  LAN), collects and processes data transmissions from such endpoint devices and
                                  transmits such data to a CellMaster.
 
NETWORK METER READING ("NMR")     Fully-automated meter reading on a network.
 
NETWORK OPERATING SYSTEM ("NOS")  A Network Operating System is the software that supports the operation of
                                  distributed applications with communications, database capabilities, and common
                                  Applications Programming Interfaces (APIs).
 
NODE                              In the CellNet's system, a node is an internet addressable, responsive,
                                  computer-based subsystem (for example, a System Controller workstation or a MCC)
                                  that is able to take part in internetworking activities.
 
OBJECT-ORIENTED                   An adjective that describes a method of software analysis, design, and/or
                                  programming that facilitates sophisticated problem-solving. Object-oriented
                                  systems are flexible and maintainable because of their natural way of handling
                                  user-oriented systems and consistent, powerful, underlying representation for
                                  what is to be built and how it will be built. The CellNet system is built on an
                                  object-oriented, distributed infrastructure.
 
PACKET                            A block of data preceded by, and perhaps followed by, one or more bytes of
                                  information specific to the communications service (a communications protocol)
                                  used to transmit the packet.
 
PERSONAL COMMUNICATIONS SERVICES  Digital wireless communications services which are expected to use a microcell
("PCS")                           technology and operate at a higher frequency than cellular systems.
 
PROTOCOL                          Rules and conventions that govern communication between OSI model layers and, in
                                  the CellNet system, subsystems for functions such as format, timing, sequencing,
                                  and error control.
 
REMOTE TERMINAL UNIT ("RTU")      Device typically used to monitor and control components of a utility's
                                  distribution network. The RTU combines digital and analog inputs, which are used
                                  to obtain detailed information about the distribution equipment being monitored.
                                  An RTU can sense remotely such things as current, temperature and power factor.
 
RF                                Radio Frequency
 
SPECIALIZED MOBILE RADIO ("SMR")  A two way radio service operating in the 800-900 megahertz band. FCC
                                  restrictions on use of this bandwidth for taxi dispatchers and similar vehicle
                                  "fleet" operators have been relaxed, allowing holders of these frequency
                                  licenses to expand into cellular-like services.
</TABLE>
    
 
                                      A-2
<PAGE>
<TABLE>
<CAPTION>
TERM                              DEFINITION
- --------------------------------  --------------------------------------------------------------------------------
<S>                               <C>
SPREAD SPECTRUM                   A modulation technique in which a signal is broadcast over a range of
                                  frequencies to minimize noise and interference.
 
TIME-OF-USE ("TOU")               Time-of-use metering allows a utility to bill electric power usage at different
                                  rates, according to the time that the power was consumed.
 
WIDE AREA NETWORK ("WAN")         In the CellNet system the WAN connects the CellMasters to the MCCs in a given
                                  service area.
</TABLE>
 
   
                                      A-3
    
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Independent Auditors' Report...............................................................................        F-2
 
Consolidated Balance Sheets as of December 31, 1994 and 1995 and June 30, 1996 (unaudited).................        F-3
 
Consolidated Statements of Operations for the years ended December 31, 1993, 1994 and 1995 and the six
 months ended June 30, 1995 and 1996 (unaudited)...........................................................        F-4
 
Consolidated Statements of Stockholders' Equity (Deficit) for the years ended December 31, 1993, 1994 and
 1995 and the six months ended June 30, 1996 (unaudited)...................................................        F-5
 
Consolidated Statements of Cash Flows for the years ended December 31, 1993, 1994 and 1995 and the six
 months ended June 30, 1995 and 1996 (unaudited)...........................................................        F-6
 
Notes to Consolidated Financial Statements.................................................................        F-7
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
CellNet Data Systems, Inc.:
 
    We have audited the accompanying consolidated balance sheets of CellNet Data
Systems, Inc. and subsidiaries (the "Company") as of December 31, 1994 and 1995,
and  the  related consolidated  statements  of operations,  stockholders' equity
(deficit) and  cash flows  for  each of  the three  years  in the  period  ended
December  31, 1995.  These financial  statements are  the responsibility  of the
Company's management.  Our responsibility  is  to express  an opinion  on  these
financial statements based on our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our opinion, such  consolidated financial statements  present fairly, in
all material respects, the financial position of CellNet Data Systems, Inc.  and
subsidiaries  at December 31, 1994 and 1995, and the results of their operations
and their cash flows for  each of the three years  in the period ended  December
31, 1995 in conformity with generally accepted accounting principles.
 
DELOITTE & TOUCHE LLP
 
   
San Jose, California
February 9, 1996
(April 11, 1996 as to the last sentence of the
second paragraph of Note 5 and
September 5, 1996 as to Note 10)
    
 
                                      F-2
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
                          CONSOLIDATED BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                               DECEMBER 31,                    PRO FORMA
                                                           --------------------   JUNE 30,     JUNE 30,
                                                             1994       1995        1996         1996
                                                           ---------  ---------  -----------  -----------
                                                                                 (UNAUDITED)  (UNAUDITED)
                                                                                               (NOTE 1)
<S>                                                        <C>        <C>        <C>          <C>
                                                 ASSETS
 
Cash and cash equivalents................................  $  12,503  $  48,018  $   70,730   $   74,384
Short-term investments...................................     12,005     95,779      32,237       32,237
Accounts receivable......................................        703      2,118       1,904        1,904
Prepaid expenses and other...............................        248        940         886          886
Network components and inventory.........................      2,146     11,664      12,569       12,569
Networks in progress.....................................      1,333     12,602      29,850       29,850
Property -- net..........................................      2,871      7,539       9,129        9,129
Debt issuance costs -- net...............................     --          5,646       5,348        5,348
                                                           ---------  ---------  -----------  -----------
  Total assets...........................................  $  31,809  $ 184,306  $  162,653   $  166,307
                                                           ---------  ---------  -----------  -----------
                                                           ---------  ---------  -----------  -----------
 
              LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT
 
Accounts payable.........................................  $   2,050  $   7,241  $    6,329   $    6,329
Accrued compensation and related benefits................        402      1,353         735          735
Accrued liabilities......................................        889        981         990          990
Senior discount notes -- 13%.............................     --        182,528     194,720      194,720
Capital lease obligations................................        546        820         793          793
                                                           ---------  ---------  -----------  -----------
  Total liabilities......................................      3,887    192,923     203,567      203,567
                                                           ---------  ---------  -----------  -----------
Commitments and Contingencies (Notes 1 and 9)
Series CC redeemable convertible preferred stock -- $.001
 par value; 3,215,768 shares designated and outstanding
 and none on a pro forma basis; aggregate liquidation
 value of $31,000,000....................................     29,486     29,486      29,486       --
                                                           ---------  ---------  -----------  -----------
 
Stockholders' equity (deficit):
  Convertible preferred stock -- $.001 par value;
   15,000,000 shares authorized; shares outstanding,
   1994: 9,008,518; 1995: 9,136,675; 1996: 9,137,078; no
   shares outstanding on a pro forma basis; aggregate
   liquidation value of $27,812,000......................     25,990     27,195      27,196       --
  Common stock -- $.001 par value; 50,000,000 shares
   authorized; shares outstanding: 1994, 2,716,166; 1995,
   5,034,262; 1996, 5,209,472 and 34,048,134 on a pro
   forma basis...........................................     26,790     27,608      27,636       90,947
  Notes receivable from sale of common stock.............       (284)      (866)       (866 )       (866 )
  Warrants...............................................         10      2,984       2,984            9
  Accumulated deficit....................................    (54,065)   (95,021)   (127,334 )   (127,334 )
  Net unrealized loss on short-term investments..........         (5)        (3)        (16 )        (16 )
                                                           ---------  ---------  -----------  -----------
    Total stockholders' deficit..........................     (1,564)   (38,103)    (70,400 )    (37,260 )
                                                           ---------  ---------  -----------  -----------
Total liabilities and stockholders' deficit..............  $  31,809  $ 184,306  $  162,653   $  166,307
                                                           ---------  ---------  -----------  -----------
                                                           ---------  ---------  -----------  -----------
</TABLE>
    
 
          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.
 
                                      F-3
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
   
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS ENDED
                                                              YEAR ENDED DECEMBER 31,              JUNE 30,
                                                         ---------------------------------  ----------------------
                                                           1993        1994        1995        1995        1996
                                                         ---------  ----------  ----------  ----------  ----------
                                                                                                 (UNAUDITED)
<S>                                                      <C>        <C>         <C>         <C>         <C>
Revenues:
  Product sales........................................  $   1,757  $    1,447  $    1,663  $      938  $      127
  Network service revenues.............................     --          --              35      --             244
  Other revenues.......................................     --             204         428         353          49
                                                         ---------  ----------  ----------  ----------  ----------
    Total revenues.....................................      1,757       1,651       2,126       1,291         420
                                                         ---------  ----------  ----------  ----------  ----------
Costs and expenses:
  Cost of product sales................................      1,840       1,191       1,294         598         109
  Cost of network operations...........................     --          --           3,835       1,333       3,374
  Research and development.............................      5,262       9,693      22,380       6,735      13,009
  Marketing and sales..................................      1,447       3,257       4,201       1,946       2,924
  General and administrative...........................      1,450       2,583       6,805       2,874       5,412
                                                         ---------  ----------  ----------  ----------  ----------
    Total costs and expenses...........................      9,999      16,724      38,515      13,486      24,828
                                                         ---------  ----------  ----------  ----------  ----------
Loss from operations...................................     (8,242)    (15,073)    (36,389)    (12,195)    (24,408)
Other income (expense):
  Interest income......................................         66         555       4,590         860       3,458
  Interest expense.....................................       (198)       (101)     (9,320)       (754)    (11,264)
  Other -- net.........................................        (16)        (13)        166         (31)        (97)
                                                         ---------  ----------  ----------  ----------  ----------
Total other income (expense)...........................       (148)        441      (4,564)         75      (7,903)
                                                         ---------  ----------  ----------  ----------  ----------
Loss before income taxes...............................     (8,390)    (14,632)    (40,953)    (12,120)    (32,311)
Provision for income taxes.............................          1           2           3           1           2
                                                         ---------  ----------  ----------  ----------  ----------
Net loss...............................................  $  (8,391) $  (14,634) $  (40,956) $  (12,121) $  (32,313)
                                                         ---------  ----------  ----------  ----------  ----------
                                                         ---------  ----------  ----------  ----------  ----------
Pro forma net loss per share...........................                         $    (1.22) $    (0.37) $    (0.94)
                                                                                ----------  ----------  ----------
                                                                                ----------  ----------  ----------
Shares used in computing pro forma net loss per
 share.................................................                             33,497      32,817      34,483
                                                                                ----------  ----------  ----------
                                                                                ----------  ----------  ----------
</TABLE>
    
 
          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.
 
                                      F-4
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                               NET
                                CONVERTIBLE                            NOTES                               UNREALIZED
                              PREFERRED STOCK       COMMON STOCK     RECEIVABLE                              LOSS ON
                             ------------------  ------------------  FROM SALE               ACCUMULATED   SHORT-TERM
                              SHARES    AMOUNT    SHARES    AMOUNT    OF STOCK    WARRANTS     DEFICIT     INVESTMENTS    TOTAL
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
<S>                          <C>        <C>      <C>        <C>      <C>          <C>        <C>           <C>           <C>
BALANCES, January 1,
 1993......................  4,244,858  $4,181     895,492  $26,616   $ --         $    9     $ (31,040)     $--         $   (234)
Sales of Series AA
 preferred stock (less
 issuance costs of $8).....    755,142     747      --        --        --          --           --           --              747
Exercise of stock
 options...................     --        --       886,618      46      --          --           --           --               46
Conversion of subordinated
 debt ($3,242) and accrued
 interest ($32) into Series
 BB preferred stock and
 warrants..................    689,190   3,274      --        --        --          --           --           --            3,274
Sale of Series BB preferred
 stock and warrants (less
 issuance costs of $504)...  2,748,020  12,549      --        --        --          --           --           --           12,549
Sales of Series BB
 preferred stock for notes
 receivable................     52,635     250      --        --         (250)      --           --           --            --
Sale of common stock (less
 issuance costs of $1).....     --        --       400,400      19      --          --           --           --               19
Sale of stock warrants.....     --        --        --        --        --              1        --           --                1
Net loss...................     --        --        --        --        --          --           (8,391)      --           (8,391)
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
BALANCES, December 31,
 1993......................  8,489,845  21,001   2,182,510  26,681       (250)         10       (39,431)      --            8,011
Exercise of stock options
 and restricted stock
 purchase..................     --        --       533,656     109       (100)      --           --           --                9
Sale of Series DD preferred
 stock (net of issuance
 costs of $10).............    518,673   4,989      --        --        --          --           --           --            4,989
Collection of notes
 receivable................     --        --        --        --           66       --           --           --               66
Net unrealized loss on
 short-term investments....     --        --        --        --        --          --           --              (5)           (5)
Net loss...................     --        --        --        --        --          --          (14,634)      --          (14,634)
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
BALANCES, December 31,
 1994......................  9,008,518  25,990   2,716,166  26,790       (284)         10       (54,065)         (5)       (1,564)
Sale of Series DD preferred
 stock (net of issuance
 costs of $31).............    128,157   1,205      --        --        --          --           --           --            1,205
Exercise of stock options
 and restricted stock
 purchases.................     --        --     2,318,096     818       (628)      --           --           --              190
Common stock warrants
 issued in connection with
 senior discount notes.....     --        --        --        --        --          2,974        --           --            2,974
Collection of notes
 receivable................     --        --        --        --           46       --           --           --               46
Net unrealized gain on
 short-term investments....     --        --        --        --        --          --           --               2             2
Net loss...................     --        --        --        --        --          --          (40,956)      --          (40,956)
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
BALANCES, December 31,
 1995......................  9,136,675  27,195   5,034,262  27,608       (866)      2,984       (95,021)         (3)      (38,103)
Exercise of stock options
 and warrants*.............        403       1     175,210      28      --          --           --           --               29
Net unrealized loss on
 short-term investments*...     --        --        --        --        --          --           --             (13)          (13)
Net loss*..................     --        --        --        --        --          --          (32,313)      --          (32,313)
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
BALANCES, June 30, 1996*...  9,137,078  $27,196  5,209,472  $27,636   $  (866)     $2,984     $(127,334)     $  (16)     $(70,400)
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
                             ---------  -------  ---------  -------  ----------   --------   -----------   -----------   --------
</TABLE>
    
 
- ------------
*Unaudited
 
          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.
 
                                      F-5
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                   SIX MONTHS ENDED
                                                                    YEAR ENDED DECEMBER 31,            JUNE 30,
                                                                -------------------------------  --------------------
                                                                  1993       1994       1995       1995       1996
                                                                ---------  ---------  ---------  ---------  ---------
                                                                                                     (UNAUDITED)
<S>                                                             <C>        <C>        <C>        <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss....................................................  $  (8,391) $ (14,634) $ (40,956) $ (12,121) $ (32,313)
  Adjustments to reconcile net loss to net cash used for
   operating activities:
    Depreciation and amortization.............................        699        992      2,295        917      2,257
    Amortization of discount on 13% senior notes..............     --         --          9,665     --         12,192
    Amortization of debt issuance costs.......................     --         --            256         17        298
    Deferred rent.............................................       (115)       (43)       (46)        22         21
    Loss (gain) on disposition of property....................          1          2         57         14        (15)
    Changes in:
      Accounts receivable.....................................       (293)      (282)    (1,415)       208        214
      Prepaid expenses and other..............................        (93)      (126)      (692)      (668)        54
      Network components and inventory........................       (574)    (1,260)    --         --         --
      Accounts payable........................................        348      1,389      5,191      2,394       (912)
      Accrued compensation and related benefits...............     --         --            951        268       (618)
      Accrued liabilities.....................................       (673)      (676)       138        496        (12)
                                                                ---------  ---------  ---------  ---------  ---------
        Net cash used for operating activities................     (9,091)   (14,638)   (24,556)    (8,453)   (18,834)
                                                                ---------  ---------  ---------  ---------  ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Network components and inventory............................     --         --         (9,518)    (3,597)      (905)
  Networks in progress........................................     --         (1,333)   (11,269)    (2,467)   (17,482)
  Purchase of property........................................       (535)    (2,436)    (6,222)    (3,009)    (3,478)
  Other assets................................................         73     --         --         --         --
  Purchase of short-term investments..........................     (2,962)   (12,548)  (285,802)   (41,890)  (263,980)
  Proceeds from sales and maturities of short-term
   investments................................................     --          3,500    202,030     14,317    327,522
                                                                ---------  ---------  ---------  ---------  ---------
        Net cash provided by (used for) investing
         activities...........................................     (3,424)   (12,817)  (110,781)   (36,646)    41,677
                                                                ---------  ---------  ---------  ---------  ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Issuance of senior discount notes and related stock
   warrants...................................................     --         --        175,837    125,894     --
  Cash paid for debt issuance costs...........................     --         --         (5,902)    (4,034)    --
  Subordinated debt borrowings................................      3,242        350     --         --         --
  Repayment of debt obligations...............................       (403)      (511)      (524)      (313)      (160)
  Proceeds from sale of preferred stock.......................     13,296     34,122      1,205      1,205          1
  Proceeds from sale of common stock..........................         66          9        190         14         28
  Collection of notes receivable from sale of common stock....     --             66         46         46     --
                                                                ---------  ---------  ---------  ---------  ---------
        Net cash provided by (used for) financing
         activities...........................................     16,201     34,036    170,852    122,812       (131)
                                                                ---------  ---------  ---------  ---------  ---------
INCREASE IN CASH AND CASH EQUIVALENTS.........................      3,686      6,581     35,515     77,713     22,712
CASH AND CASH EQUIVALENTS, Beginning of period................      2,236      5,922     12,503     12,503     48,018
                                                                ---------  ---------  ---------  ---------  ---------
CASH AND CASH EQUIVALENTS, End of period......................  $   5,922  $  12,503  $  48,018  $  90,216  $  70,730
                                                                ---------  ---------  ---------  ---------  ---------
                                                                ---------  ---------  ---------  ---------  ---------
SUPPLEMENTAL NONCASH INVESTING AND FINANCING ACTIVITIES:
  Conversion of subordinated debt and accrued interest into
   preferred stock............................................  $   3,274  $     353  $  --      $  --      $  --
  Acquisition of property under capital leases................  $      17  $     232  $     798  $     348  $     133
  Sale of common stock for notes receivable...................  $     250  $     100  $     628  $     200  $  --
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
  Cash paid during the period for interest....................  $     166  $     101  $     113  $      44  $      56
  Cash paid for income taxes..................................  $       1  $       2  $       3  $       1  $       2
</TABLE>
 
          SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.
 
                                      F-6
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (Information as of and for the Six Months Ended June 30, 1995 and 1996 is
                                   Unaudited)
 
1.  NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
 
    NATURE  OF  OPERATIONS  --  Since  1993,  CellNet  Data  Systems,  Inc.  and
subsidiaries (the "Company") has focused substantially all of its resources  and
efforts  on the development of the CellNet wireless data communication system to
provide automated  network  meter reading  and  other services  to  the  utility
industry  and  to  providers  of  non-utility  services.  The  Company's primary
activities since 1993 have included research and development, prototype  product
development,  field testing,  commercial network installation,  and provision of
wireless data communication  services, in  connection with  the development  and
deployment of its CellNet wireless data communication system.
 
   
    The  Company is in  the process of progressively  installing its network for
Kansas City Power & Light Company and commenced the installation of its  network
for  Union Electric Company  in the first  quarter of 1996.  Management plans to
significantly  increase   operations   through  the   roll-out   of   additional
installations  for other utility companies and  intends to fund these operations
through additional debt and equity financing arrangements.
    
 
   
    The Company  provides  its services  to  utility companies  under  long-term
contracts by which the Company is obligated to provide meter reading and related
services over the term of the contract. The length of the contracts vary and can
include renewal options under which the Company's commitments under the contract
could exceed 20 years, although there is no assurance that such options would be
exercised,  or that contract termination clauses would not be exercised. Renewal
options generally contain terms which are substantially similar to the  original
service  agreements. Contract termination clauses  generally provide for defined
payments intended to cover remaining network asset values.
    
 
    CONSOLIDATION -- The accompanying consolidated financial statements  include
the  accounts of CellNet  Data Systems, Inc.  and its wholly-owned subsidiaries.
All  material  intercompany   accounts  and  transactions   are  eliminated   in
consolidation.
 
    FINANCIAL  STATEMENT ESTIMATES -- The preparation of financial statements in
conformity with generally accepted accounting principles requires management  to
make  estimates  and assumptions  that affect  the  reported amounts  of assets,
liabilities, revenues and expenses during  the reporting period. Such  estimates
include  the  level  of  the allowance  for  potentially  uncollectible accounts
receivable, reserves for  network components  and inventory  that are  obsolete,
slow  moving or nonsalable, evaluation of network assets for impairment, accrued
liabilities and  a  valuation allowance  for  net deferred  tax  assets.  Actual
results could differ from these estimates.
 
    CASH  EQUIVALENTS  -- Cash  equivalents are  highly liquid  debt instruments
acquired with  an  original maturity  of  three  months or  less.  The  recorded
carrying  amounts of the  Company's cash and  cash equivalents approximate their
fair market value.
 
    SHORT-TERM INVESTMENTS -- Short-term  investments represent debt and  equity
securities  which  are  stated at  fair  value. All  short-term  investments are
classified  as   available-for-sale.  Any   temporary  difference   between   an
investment's  amortized  cost and  its market  value is  recorded as  a separate
component of  stockholders' deficit  until such  gains or  losses are  realized.
Gains  or  losses on  the sale  of  securities are  computed using  the specific
identification method.
 
    The Company adopted Statement of  Financial Accounting Standards (SFAS)  No.
115,  "Accounting for  Certain Investments  in Debt  and Equity  Securities," in
1994. The adoption of  this standard did  not have a  significant effect in  the
Company's financial position or results of operations.
 
    CUSTOMER  CONCENTRATION  AND  CONCENTRATION  OF  CREDIT  RISK  --  Financial
instruments  that  potentially  subject  the  Company  to  credit  risk  consist
principally    of   cash   and    cash   equivalents,   short-term   investments
 
                                      F-7
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
1.  NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
and accounts receivable.  The Company sells  its products and  services to,  and
installs  its networks primarily for utility  companies in the United States. To
reduce credit  risk related  to accounts  receivable, the  Company  periodically
evaluates  its  customers'  financial  condition.  Collateral  is  generally not
required.  Reserves  are   maintained  for  credit   losses,  but  the   Company
historically  has not experienced  any significant losses  related to individual
customers or  groups  of customers  in  any particular  geographical  area.  One
utility represented 29% and 73% of revenues for the year ended December 31, 1995
and the six months ended June 30, 1996, respectively and 60% and 27% of accounts
receivable  at the end of the  respective periods. Another utility accounted for
23% of accounts receivable  at June 30, 1996.  Another utility represented  18%,
58%  and 64% of revenues  for the years ended December  31, 1993, 1994 and 1995,
respectively and  34%  of accounts  receivable  at December  31,  1994.  Another
utility  represented 37% and 10%, and  an additional utility represented 36% and
14% of revenues for the years ended December 31, 1993 and 1994, respectively.
    
 
    The Company invests in a variety of financial instruments such as commercial
paper, debt  securities of  the  U.S. government,  foreign debt  securities  and
preferred  stock. The Company's policy limits the amount of credit exposure with
any one  financial instrument  or commercial  issuer. All  such instruments  are
rated  by  Standard and  Poors  as A-  or higher.  The  Company also  places its
investments for safekeeping with high-credit-quality financial institutions.
 
    NETWORK COMPONENTS AND  INVENTORY --  Network components  and inventory  are
stated  at the lower of cost (first-in, first-out method) or market. At December
31, 1995 and  June 30,  1996, such  network components  and inventory  consisted
primarily  of purchased and in process materials to be included in the Company's
installed networks. Once the assembly process is complete, the inventory item is
transferred to  a  particular  network  location and  included  in  networks  in
progress.
 
    NETWORKS  IN PROGRESS  -- Networks  in progress,  which are  stated at cost,
include both equipment assembled at the Company and systems partially  installed
at  customer sites. Interest is capitalized  using the Company's cost of capital
until the  point  in the  installation  process  at which  each  network  begins
generating  revenue. Accordingly,  $458,000 of  interest was  capitalized during
1995 and $983,000 of interest was capitalized for the six months ended June  30,
1996.  Depreciation is computed on a straight-line basis over the shorter of the
estimated useful lives of the network  assets or the expected minimum period  of
revenue generation under the related contract (estimated to be approximately ten
years).
 
    PROPERTY  -- Property is  stated at cost.  Depreciation and amortization are
computed on a straight-line basis over  estimated useful lives of three to  five
years or the capital lease term, if shorter.
 
    DEBT  ISSUANCE COST  is comprised  of debt  issue costs  associated with the
Senior Discount Notes (see  Note 5). These costs  are capitalized and  amortized
using the effective interest method over the lives of the related debt.
 
    RECENTLY  ISSUED  ACCOUNTING STANDARDS  --  In October  1995,  the Financial
Accounting  Standards  Board  (FASB)  issued  SFAS  No.  123,  "Accounting   for
Stock-Based  Compensation."  The new  standard defines  a  fair value  method of
accounting for  stock options  and other  equity instruments.  The new  standard
permits  companies to continue to account for equity transactions with employees
under existing  accounting  rules but  requires  disclosure  in a  note  to  the
financial  statements of the pro forma net  income as if the Company had applied
the new  method of  accounting. The  Company intends  to follow  the  disclosure
alternative  for its employee stock plans at  December 31, 1996. Adoption of the
new standard will not impact  reported earnings and will  have no effect on  the
Company's cash flows.
 
    In  March 1995, the FASB issued SFAS No. 121, "Accounting for the Impairment
of Long-Lived Assets to be Disposed Of," which became effective January 1, 1996.
This statement requires the Company to review
 
                                      F-8
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
1.  NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
long-lived assets for  impairment whenever  events or  changes in  circumstances
indicate   that  the  carrying  amount  of   an  asset  may  not  be  recovered.
Implementation did  not  have  a  material impact  on  the  Company's  financial
statements.
 
    REVENUE  RECOGNITION --  Network service revenue,  associated with installed
networks, is recognized in the period  of service. Product sales are  recognized
upon  product shipment.  Estimated warranty costs  are recorded at  the time the
product sales are recognized.
 
    RESEARCH AND DEVELOPMENT -- Research  and development costs are expensed  as
incurred. The Company's networks include certain software applications which are
integral  to their operation. The  costs to develop such  software have not been
capitalized as  the  Company believes  its  software development  processes  are
essentially   completed  concurrent  with  the  establishment  of  technological
feasibility of the software and/or development of the related network hardware.
 
    FOREIGN CURRENCY TRANSLATION  -- The  functional currency  of the  Company's
U.K.  subsidiary  is  the  U.S. dollar.  Accordingly,  all  monetary  assets and
liabilities are  translated at  the current  exchange  rate at  the end  of  the
period,  nonmonetary assets and  liabilities are translated  at historical rates
and operating expenses are translated at average exchange rates in effect during
the period. Transaction  gains and losses,  which are included  in other  income
(expense)  in the accompanying  consolidated statements of  operations, have not
been significant.
 
    FAIR VALUE OF FINANCIAL INSTRUMENTS -- The recorded carrying amounts of  the
Company's financial instruments, namely cash and cash equivalents and short-term
investments,  approximate  their fair  value. The  estimated  fair value  of the
Company's Senior  Discount  Notes was  $179,563,000  at December  31,  1995  and
$212,469,000  at  June  30,  1996.  The  fair  values  of  cash  equivalents and
short-term investments are based on quoted market prices and the estimated  fair
value  of the  Senior Discount  Notes is  based on  information provided  by the
initial purchaser of the original notes.
 
    PRO FORMA NET LOSS  PER SHARE --  Pro forma net loss  per share is  computed
using  the  weighted  average  number of  common  and  common  equivalent shares
outstanding during the period. Common equivalent shares include preferred  stock
and certain warrants (using the "if converted" method) and stock options and the
remaining  warrants (using the treasury  stock method). Common equivalent shares
are excluded from the computation if their effect is anti-dilutive, except that,
pursuant to the Securities and Exchange Commission's Staff Accounting  Bulletins
and  staff policy,  such computations include  all common  and common equivalent
shares issued within the 12 months preceding the initial filing date as if  they
were  outstanding  for  all  periods  presented.  In  addition,  all outstanding
preferred stock that converts and all warrants that are assumed to be  exercised
in  connection with  the proposed  offering are  included in  the computation as
common equivalent shares even when the effect is anti-dilutive.
 
    UNAUDITED INTERIM FINANCIAL INFORMATION  -- The unaudited interim  financial
information  as of June 30, 1996 and for  the six months ended June 30, 1995 and
1996 has been prepared on the same basis as the audited financial statements. In
the opinion of management, such  unaudited information includes all  adjustments
(consisting only of normal recurring accruals) necessary for a fair presentation
of this interim information. Operating results for the six months ended June 30,
1996  are not necessarily indicative of the results that may be expected for the
year ending December 31, 1996.
 
   
    UNAUDITED PRO FORMA INFORMATION -- Unaudited pro forma information  reflects
the  conversion  of  each of  the  outstanding  shares of  Series  CC redeemable
convertible preferred stock into two shares  of common stock, the conversion  of
each  of the outstanding  shares of Series  AA, BB and  DD convertible preferred
stock into two shares  of common stock, the  assumed exercise and conversion  of
each of the outstanding warrants
    
 
                                      F-9
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
1.  NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
to  purchase Series BB preferred stock into  two shares of common stock, and the
assumed exercise of each of the  outstanding warrants issued in connection  with
the  Company's Senior Discount Notes (see Notes 5 and 7) for one share of common
stock, upon the closing of the  initial public offering as contemplated by  this
Prospectus.
    
 
2.  SHORT-TERM INVESTMENTS
    The  fair value and the amortized cost of short-term investments at December
31, 1994 and 1995 and  June 30, 1996 are presented  as follows. Fair values  are
based  on quoted market  prices obtained from  the Company's broker.  All of the
Company's short-term investments are classified as available-for-sale, since the
Company intends to  sell them  as needed  for operations.  The following  tables
present  the unrealized  holding gains  and losses  related to  each category of
investment security (in thousands):
 
<TABLE>
<CAPTION>
                                                                              DECEMBER 31, 1994
                                                                      ----------------------------------
                                                                                   UNREALIZED
                                                                       AMORTIZED    LOSS ON     MARKET
                                                                         COST      INVESTMENT    VALUE
                                                                      -----------  ----------  ---------
<S>                                                                   <C>          <C>         <C>
Equity securities...................................................   $   6,001   $       (1) $   6,000
Corporate debt securities...........................................       3,509           (4)     3,505
Debt securities of states of the United States and political
 subdivisions of the states.........................................       2,500       --          2,500
                                                                      -----------  ----------  ---------
Total...............................................................   $  12,010   $       (5) $  12,005
                                                                      -----------  ----------  ---------
                                                                      -----------  ----------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31, 1995
                                                         ----------------------------------------------
                                                                      UNREALIZED  UNREALIZED
                                                          AMORTIZED    LOSS ON     GAIN ON     MARKET
                                                            COST      INVESTMENT  INVESTMENT    VALUE
                                                         -----------  ----------  ----------  ---------
<S>                                                      <C>          <C>         <C>         <C>
Auction-rate preferred stock...........................   $  19,803   $       (3) $   --      $  19,800
Corporate debt securities..............................      64,664       --          --         64,664
Debt securities of states of the United States and
 political subdivisions of the states..................       3,000       --          --          3,000
Debt securities issued by United States government
 agencies..............................................       4,647       --               2      4,649
Foreign debt securities................................       3,668           (2)     --          3,666
                                                         -----------  ----------  ----------  ---------
Total..................................................   $  95,782   $       (5) $        2  $  95,779
                                                         -----------  ----------  ----------  ---------
                                                         -----------  ----------  ----------  ---------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                         JUNE 30, 1996
                                                         ----------------------------------------------
                                                                      UNREALIZED  UNREALIZED
                                                          AMORTIZED    LOSS ON     GAIN ON     MARKET
                                                            COST      INVESTMENT  INVESTMENT    VALUE
                                                         -----------  ----------  ----------  ---------
<S>                                                      <C>          <C>         <C>         <C>
Auction-rate preferred stock...........................   $  22,800   $   --      $   --      $  22,800
Corporate debt securities..............................       9,453          (16)     --          9,437
                                                         -----------  ----------  ----------  ---------
Total..................................................   $  32,253   $      (16) $   --      $  32,237
                                                         -----------  ----------  ----------  ---------
                                                         -----------  ----------  ----------  ---------
</TABLE>
 
                                      F-10
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
2.  SHORT-TERM INVESTMENTS (CONTINUED)
    The final maturity periods  of short-term investments  at December 31,  1995
were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                 MARKET VALUE
                                                             -----------------------------------------------------
                                                                         ONE TO     GREATER
                                                              WITHIN      FIVE      THAN 10      NO
                                                             ONE YEAR     YEARS      YEARS    MATURITY     TOTAL
                                                             ---------  ---------  ---------  ---------  ---------
<S>                                                          <C>        <C>        <C>        <C>        <C>
Auction-rate preferred stock...............................  $  --      $  --      $  --      $  19,800  $  19,800
Corporate debt securities..................................     17,064     10,000     28,400      9,200     64,664
Debt securities of states of the United States and
 political subdivisions of the states......................     --         --          3,000     --          3,000
Debt securities issued by United States government
 agencies..................................................      4,649     --         --         --          4,649
Foreign debt securities....................................      3,666     --         --         --          3,666
                                                             ---------  ---------  ---------  ---------  ---------
    Total..................................................  $  25,379  $  10,000  $  31,400  $  29,000  $  95,779
                                                             ---------  ---------  ---------  ---------  ---------
                                                             ---------  ---------  ---------  ---------  ---------
</TABLE>
 
    The  final maturity periods of short-term  investments at June 30, 1996 were
as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                     MARKET VALUE
                                               ---------------------------------------------------------
                                                             ONE TO      GREATER
                                               WITHIN ONE     FIVE       THAN 10       NO
                                                  YEAR        YEARS       YEARS     MATURITY     TOTAL
                                               -----------  ---------  -----------  ---------  ---------
Auction-rate preferred stock.................   $  --       $  --       $  22,800   $  --      $  22,800
<S>                                            <C>          <C>        <C>          <C>        <C>
Corporate debt securities....................       9,437      --          --          --          9,437
                                               -----------  ---------  -----------  ---------  ---------
                                                $   9,437   $  --       $  22,800   $  --      $  32,237
                                               -----------  ---------  -----------  ---------  ---------
                                               -----------  ---------  -----------  ---------  ---------
</TABLE>
 
   
    All short-term investments  with a  final maturity exceeding  one year  have
provisions requiring their repurchase at par at the option of the holder and for
adjustment to market rates of interest on at least an annual basis (auction-rate
preferred  stock). The Company  treats such investments as  having a maturity of
one year or less for purposes of compliance with investment limitations provided
in the Senior Discount Note Indenture (see Note 5).
    
 
3.  PROPERTY
    Property consists of (in thousands):
 
<TABLE>
<CAPTION>
                                                                      DECEMBER 31,
                                                                  --------------------   JUNE 30,
                                                                    1994       1995        1996
                                                                  ---------  ---------  -----------
Manufacturing equipment and tools...............................  $   1,363  $   4,870   $   6,403
<S>                                                               <C>        <C>        <C>
Office furniture and equipment..................................      3,639      4,111       5,712
Engineering equipment...........................................      1,639      2,119       2,604
                                                                  ---------  ---------  -----------
Total...........................................................      6,641     11,100      14,719
Accumulated depreciation and amortization.......................     (3,770)    (3,561)     (5,590)
                                                                  ---------  ---------  -----------
Total...........................................................  $   2,871  $   7,539   $   9,129
                                                                  ---------  ---------  -----------
                                                                  ---------  ---------  -----------
</TABLE>
 
                                      F-11
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
4.  ACCRUED LIABILITIES
    Accrued liabilities consist of (in thousands):
 
<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                                                      --------------------   JUNE 30,
                                                                        1994       1995        1996
                                                                      ---------  ---------  -----------
Accrued contractual obligations.....................................  $     325  $     273   $     315
<S>                                                                   <C>        <C>        <C>
Deferred revenue....................................................        210        190         192
Warranty reserve....................................................        130         15          14
Other...............................................................        224        503         469
                                                                      ---------  ---------  -----------
Total...............................................................  $     889  $     981   $     990
                                                                      ---------  ---------  -----------
                                                                      ---------  ---------  -----------
</TABLE>
 
5.  SENIOR DISCOUNT NOTES
   
    In 1995,  the  Company received  $175,837,000  in gross  proceeds  from  the
issuance  of  $325,000,000 aggregate  principal amount  at  maturity of  its 13%
Senior Discount  Notes  due June  15,  2005  and related  warrants  to  purchase
2,600,000 shares of common stock at $0.005 per share (the Notes and Common Stock
Warrants).  Aggregate proceeds of $2,974,000 were attributed to the Common Stock
Warrants. Commencing December 15,  2000, interest will be  payable on the  Notes
semi-annually  in arrears on each December 15 and June 15 at the rate of 13% per
annum.
    
 
   
    The Notes are redeemable at the option of the Company, in whole or in  part,
at  any time on and  after June 15, 2000 at  specified redemption prices for the
relevant year of  redemption, plus accrued  and unpaid interest  to the date  of
redemption.  In addition, the  Company may redeem  in cash at  its option at any
time prior to June 15, 1998 up to  25% of the aggregate principal amount of  the
Notes  at 113%  of the  accreted value  thereof on  the date  of redemption plus
accrued and  unpaid interest,  if any,  from  the proceeds  of a  public  equity
offering (as defined). There are no sinking fund requirements. In the event of a
change  of control  (as defined),  each holder  of the  Notes has  the option to
require the Company to  repurchase such holder's Notes  at 101% of the  accreted
value  thereof on the date of repurchase (if  prior to June 15, 2000) or 101% of
the aggregate principal face amount  thereof, plus accrued and unpaid  interest,
if  any, to the repurchase date  (if on or after June  15, 2000). The Notes rank
senior in right of payment to all existing and future subordinated  indebtedness
of  the Company and pari passu with  all existing and future senior indebtedness
of the Company. The Indenture pursuant  to which the Senior Discount Notes  were
issued contains certain covenants that, among other things, limit the ability of
the  Company to make dividend payments, make investments, repurchase outstanding
shares of stock, prepay other  debt obligations, incur additional  indebtedness,
effect   asset  dispositions,   engage  in  sale   and  leaseback  transactions,
consolidate, merge or  sell all or  substantially all of  the Company's  assets,
engage  in transactions with  affiliates, or effect  certain transactions by its
restricted subsidiaries (as  defined). At December  31, 1995, a  portion of  the
Company's  short-term investments had been made in corporate debt securities and
auction-rate  preferred  stock   in  amounts  which   exceeded  the   investment
limitations  under the Indenture.  The Company was  otherwise in compliance with
the financial  covenants of  the Indenture  at December  31, 1995.  The  Company
subsequently  adjusted its investment portfolio to bring it into compliance with
such limitations within the  period provided by the  Indenture, and at June  30,
1996 the Company was in compliance with all covenants of the Indenture.
    
 
6.  SERIES CC REDEEMABLE CONVERTIBLE PREFERRED STOCK
    In  conjunction with the  proposed initial public  offering of the Company's
common stock,  all  outstanding  shares  of  Series  CC  redeemable  convertible
preferred stock will automatically convert into common stock upon the closing of
the offering (see Note 1).
 
                                      F-12
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
6.  SERIES CC REDEEMABLE CONVERTIBLE PREFERRED STOCK (CONTINUED)
   
    At  December  31, 1995  and June  30,  1996, 3,215,768  shares of  Series CC
redeemable convertible  preferred stock  were designated  and outstanding.  Each
share is convertible into two shares of common stock, subject to adjustments for
events  of dilution. In addition to  converting upon an initial public offering,
the Series  CC  redeemable convertible  preferred  stock is  also  automatically
convertible  into common stock upon the election of the holders of more than 60%
of the outstanding shares of such series, or at such time as fewer than  500,000
shares  remain outstanding. Each share has the  same voting rights as the number
of shares of common stock into which it is convertible.
    
 
    Holders are entitled to noncumulative dividends  of $0.964 per share or,  in
the event of liquidation or merger, liquidation distributions of $9.64 per share
in  preference  to all  convertible preferred  stock. The  holders of  Series CC
preferred stock have the right of first  refusal to purchase a pro rata  portion
of  preferred or  common stock the  Company proposes  to issue to  any public or
private utility. Further,  the holders  of Series  CC preferred  stock have  the
right of first refusal to purchase a pro rata portion of any preferred or common
stock  that any  subsidiary of the  Company proposes  to issue to  any public or
private utility if the subsidiary's business is unrelated to the market area  of
such  utility or  if such  securities are  convertible into  common or preferred
stock of the Company. The right of first refusal terminates three years after an
initial public offering.
 
    Under a Put Agreement dated August 15, 1994 (the Put Agreement), the holders
of Series CC preferred stock, acting as  a group representing not less than  25%
of  the outstanding  Series CC  preferred stock, have  the right  to "put" those
shares to the Company after May 12,  2001 (Investor Put) at the higher of  $9.64
per  share or the fair market value at  the time of exercise of the Investor Put
(the Redemption Price). The Investor Put will be extinguished in the event of an
initial pubic offering  by the  Company of  its common  stock in  which the  net
proceeds  to the Company are at  least $20 million, in the  event of the sale of
the Company or if not exercised by November 13, 2002. In the event the  Investor
Put  is not completed by the Company for  any reason within six months after the
right is exercised then  (a) the Redemption Price  shall increase annually  from
the date the Investor Put was exercised at a rate of 15% for the first year, and
five  additional percentage points  for each year thereafter  (pro rated for any
partial year), and (b) the holders of  Series CC preferred stock shall have  the
right  to initiate a separate demand  registration at the Company's expense only
for the holders of shares with rights  under the Investor Put. In the event  the
fair  market value of the Series CC  preferred stock exceeds $96.40 (as adjusted
for any stock split, stock dividend, or other combinations or reclassifications)
per share at the time the Investor  Put is exercised, the amount payable to  the
holders of the Series CC preferred stock who participate in the Investor Put may
be  paid 50% at closing and the balance, plus interest at the prime rate, on the
first anniversary  of  the closing.  The  Company's obligations  under  the  Put
Agreement  will be suspended for such  time that performance of such obligations
would result  in a  breach of,  a  default, or  an event  of default  under  the
Indenture  governing  the Company's  Senior  Discount Notes  or  would otherwise
result in a violation of law.
 
                                      F-13
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
7.  STOCKHOLDERS' EQUITY (DEFICIT)
 
    CONVERTIBLE PREFERRED  STOCK --  In conjunction  with the  proposed  initial
public  offering  of  the  Company's common  stock,  all  outstanding  shares of
convertible preferred stock  will automatically convert  into common stock  upon
the  closing of  the offering  (See Note 1).  At December  31, 1995, convertible
preferred stock consists of:
 
<TABLE>
<CAPTION>
                                                                                     AMOUNT (NET OF
                                                                            ISSUE       ISSUANCE      LIQUIDATION
                                                 DESIGNATED  OUTSTANDING    PRICE        COSTS)       PREFERENCE
                                                 ----------  -----------  ---------  --------------  -------------
<S>                                              <C>         <C>          <C>        <C>             <C>
Series AA......................................   5,000,000   5,000,000   $    1.00   $  4,928,000   $   5,000,000
Series BB......................................   4,256,733   3,489,845        4.75     16,073,000      16,577,000
Series DD......................................     647,923     646,830        9.64      6,194,000       6,235,000
                                                 ----------  -----------             --------------  -------------
                                                  9,904,656   9,136,675               $ 27,195,000   $  27,812,000
                                                 ----------  -----------             --------------  -------------
                                                 ----------  -----------             --------------  -------------
</TABLE>
 
Significant terms of the convertible preferred stock are as follows:
 
   
    - Each share is  convertible into  two shares  of common  stock, subject  to
      adjustments  for  events  of dilution.  Shares  of  Series AA,  BB  and DD
      preferred stock will  automatically be  converted into  common stock  upon
      completion of a public offering with net proceeds in excess of $20 million
      and at a price equal to or greater than $2.00, $6.00 ($12.05 after January
      1,  1997)  and $9.64  ($12.05  after January  1,  1997) per  common share,
      respectively (see  Note  1).  Each  series  of  preferred  stock  is  also
      automatically  convertible  into common  stock  upon the  election  of the
      holders of more than 50% of the  outstanding shares of such series, or  at
      such  time as fewer than  500,000 shares (1,000,000 shares  in the case of
      Series AA preferred stock) of such  series (as adjusted for stock  splits,
      stock dividends and combinations) remain outstanding.
    
 
    - Each  share has the same  voting rights as the  number of shares of common
      stock into which it is convertible.
 
    - Holders of preferred stock are entitled to noncumulative dividends or,  in
      the  event  of  liquidation  or  merger,  distributions  in  the  order of
      preference shown as follows:
 
<TABLE>
<CAPTION>
                                                                  NON-CUMULATIVE    LIQUIDATION
                                                                   DIVIDENDS PER   DISTRIBUTION
                                                                       SHARE         PER SHARE
                                                                  ---------------  -------------
<S>                                                               <C>              <C>
Series BB.......................................................     $   0.475       $    4.75
Series AA.......................................................     $   0.100       $    1.00
Series DD.......................................................     $   0.964       $    9.64
</TABLE>
 
    - Each series of preferred stock must receive their full dividend before the
      next series receives any dividends. Additionally, any dividends  exceeding
      these  minimum amounts are shared between  the common and preferred shares
      on a pro-rata basis.
 
   
    - Each series  of  preferred  stock must  receive  their  full  preferential
      amounts  before the  next series  receives any  liquidation distributions.
      Additionally, any  funds available  for distribution  in excess  of  these
      minimum  amounts,  plus  $0.25  per  share  for  common  stock,  is  to be
      distributed  ratably  among   the  holders  of   the  common,   redeemable
      convertible preferred and convertible preferred stock.
    
 
    - The  holders of at least  5,000 shares of Series  AA or BB preferred stock
      have the right  of first  refusal to purchase  their pro  rata portion  of
      certain  issues of preferred  or common stock  of the Company  on the same
      terms and  conditions  as the  Company  offers such  securities  to  other
      investors,  subject to  certain conditions  and limitations.  The right of
      first refusal  of  all  holders  terminates  upon  the  registered  public
      offering  of the Company's common stock with  net proceeds of at least $20
      million.
 
                                      F-14
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
7.  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)
    COMMON STOCK --  At December 31,  1995 and  June 30, 1996,  the Company  had
reserved shares of common stock for issuance as follows:
 
   
<TABLE>
<CAPTION>
                                                          DECEMBER    JUNE 30,
                                                          31, 1995      1996
                                                         ----------  -----------
Conversion of preferred stock..........................  24,704,886   24,705,692
<S>                                                      <C>         <C>
Issuance under stock option plans......................  5,261,630     5,086,420
Issuance upon exercise of common stock warrants........  2,653,832     2,653,832
Issuance upon exercise and conversion of Series BB
 preferred stock warrants..............................  1,533,776     1,532,970
                                                         ----------  -----------
Total..................................................  34,154,124   33,978,914
                                                         ----------  -----------
                                                         ----------  -----------
</TABLE>
    
 
    WARRANTS  -- At December 31, 1995,  the following warrants to purchase stock
were outstanding:
 
   
    Warrants to purchase 2,310 shares of  common stock at $126.92 per share  are
exercisable  and  expire at  various dates  through December  9, 1996,  or, with
notice from  the  Company  immediately  prior  to (a)  the  closing  of  a  firm
committment  underwritten initial  public offering of  the Company's securities,
(b) the merger  of the Company  into or  with another corporation  in which  the
Company  is not the survivor  and the stockholders of  the Company own less than
50% of the  voting securities  of the surviving  corporation, or  (c) the  sale,
transfer or lease of all or substantially all of the assets of the Company.
    
 
   
    Warrants  to purchase  750 shares  (300 shares at  June 30,  1996) of common
stock at $20.00 per share, are  exercisable and expire at various dates  through
February  6, 1997, or, with notice from the Company immediately prior to (a) the
merger of the Company into or with another corporation in which the stockholders
of the Company  hold less than  50% of  the voting securities  of the  surviving
corporation  or its parent;  (b) the sale,  conveyance or disposition  of all or
substantially all  of  the  assets  of the  Company,  or  (c)  the  liquidation,
dissolution or winding up of the Company.
    
 
   
    Warrants to purchase 50,000 shares of common stock at $2.00 per share become
exercisable  over a  five-year period  at the  rate of  20% per  year commencing
August 21, 1992, subject  to certain conditions. The  purchase right may not  be
exercised  prior to either  (a) February 24,  1998, (b) the  effective date of a
registration statement filed by  the Company for an  initial public offering  of
its  common stock, (c) five days prior to the merger of the Company with or into
another corporation as a  result of which the  stockholders of the Company  hold
less  than 50%  of the  equity securities  of the  surviving corporation  or its
parent, or (d) five days  prior to a sale, conveyance  or disposition of all  or
substantially  all of the assets of the Company. The warrants expire on February
24, 1999, or, with written  notice from the Company, two  days prior to (a)  the
merger  of the  Company with  or into  a corporation  as a  result of  which the
stockholders of the Company hold less than  50% of the equity securities of  the
surviving  corporation or its parent (unless  the securities received are freely
tradable and listed on a national securities exchange or on the Nasdaq  National
Market),  (b) the sale, conveyance or disposition of all or substantially all of
the assets of the Company, or (c) the liquidation, dissolution or winding up  of
the Company.
    
 
    In  connection with the  sale of Series  BB preferred stock  in 1993 certain
purchasers were  granted  warrants  to purchase  an  additional  766,888  shares
(766,485  shares at  June 30, 1996)  of Series  BB preferred stock  at $4.75 per
share. The warrants are exercisable from  the date of grant through the  earlier
of  (a)  September  30,  1998  or (b)  with  written  notice  from  the Company,
immediately prior to (i) the closing of a firm committment underwritten  initial
public offering of the Company's securities (see Note 1), (ii) the merger of the
Company  into  or with  another  corporation in  which  the Company  is  not the
survivor and the stockholders of  the Company hold less  than 50% of the  voting
securities of the surviving corporation, or (iii) the sale, transfer or lease of
all or substantially all of the assets of the Company.
 
                                      F-15
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
7.  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)
   
    Warrants  to purchase 2,600,000  shares of common stock  at $0.005 per share
were granted in connection with the issuance  and sale in 1995 of the  Company's
Senior Discount Notes (see Note 5). The warrants expire on the earliest to occur
of  (a) June 15, 2005, (b) 90 days after  a change of control of the Company (as
defined) (see Note 1), and (c) 90 days after the consummation of a public equity
offering of  the Company  (as defined).  The warrants  may be  exercised on  the
earliest  to occur of  (a) the seventh day  prior to a change  of control of the
Company (as  defined), (b)  the consummation  of a  public equity  offering  (as
defined), or (c) 90 days prior to expiration.
    
 
   
    STOCK  OPTION PLANS -- The Company has  stock option plans (the Plans) under
which shares are  reserved for  issuance to officers,  directors, employees  and
consultants.  Under the Plans, both incentive  and nonstatutory stock options to
purchase common stock may be granted or  restricted common stock may be sold  at
prices  not less than the fair  market value of the common  stock at the date of
grant. The fair market value and terms  of exercise are determined by the  Board
of  Directors.  Options  outstanding  at  December  31,  1995  generally  become
exercisable ratably over five years, commencing six months from the date of  the
individual's  employment or the date of grant and expire ten years from the date
of grant. At December 31, 1995, there were 1,827,000 shares available for future
grants under the Plans.
    
 
    A summary of stock option activity under the Plans on a combined basis is as
follows:
 
   
<TABLE>
<CAPTION>
                                                                                         OUTSTANDING OPTIONS
                                                                                    -----------------------------
                                                                                     NUMBER OF
                                                                                      SHARES     PRICE PER SHARE
                                                                                    -----------  ----------------
<S>                                                                                 <C>          <C>
Balances, January 1, 1994.........................................................    1,618,434  $  0.05 to $0.25
Granted...........................................................................    4,447,850     0.25 to  0.50
Exercised.........................................................................     (533,656)    0.25 to  0.50
Cancelled.........................................................................     (292,000)    0.25 to  0.50
                                                                                    -----------
Balances, December 31, 1994                                                           5,240,628     0.05 to  0.50
Granted...........................................................................      514,600     0.50 to  1.50
Exercised.........................................................................   (2,318,096)    0.05 to  0.50
Cancelled.........................................................................     (163,498)    0.05 to  1.50
                                                                                    -----------
Balances, December 31, 1995                                                           3,273,634     0.05 to  1.50
Granted...........................................................................      743,310     1.75 to  3.00
Exercised.........................................................................     (175,210)    0.05 to  1.50
Cancelled.........................................................................      (62,598)    0.50 to  2.00
                                                                                    -----------
Balances, June 30, 1996...........................................................    3,779,136  $  0.05 to  3.00
                                                                                    -----------
                                                                                    -----------
</TABLE>
    
 
   
    RESTRICTED STOCK --  Certain officers, employees  and consultants  exercised
unvested  stock options with cash or full  recourse notes. The related shares of
common stock are subject  to repurchase by the  Company at the orginal  purchase
price  per share upon the purchaser's cessation  of service prior to the vesting
of such shares. The  restricted stock continues to  vest in accordance with  the
terms  of the original  stock option. The  related notes bear  interest at rates
ranging from 6.04% to 7.92%  and are due in 1999  through 2000. At December  31,
1995,  1,847,156 outstanding shares of such  stock were subject to repurchase at
the original exercise price (1,688,908 shares at June 30, 1996).
    
 
                                      F-16
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
8.  INCOME TAXES
    No federal income taxes  were provided in  1993, 1994, 1995  or for the  six
months  ended June 30, 1996 due to  the Company's net losses. The provisions for
income taxes  for  these periods  represent  various state  minimum  income  and
franchise taxes. The provision for income taxes differs from the amount computed
by  applying the  federal statutory  income tax rate  to the  loss before income
taxes as follows:
 
<TABLE>
<CAPTION>
                                                          YEARS ENDED DECEMBER 31,      SIX MONTHS
                                                       -------------------------------  ENDED JUNE
                                                         1993       1994       1995      30, 1996
                                                       ---------  ---------  ---------  -----------
Taxes computed at federal statutory rate.............       35.0%      35.0%      35.0%       35.0%
<S>                                                    <C>        <C>        <C>        <C>
State income taxes, net of federal effect............        4.5        4.5        4.5         4.5
Research tax credits.................................        2.8        3.1        1.0         0.6
Change in valuation allowance........................      (42.2)     (42.5)     (40.4)      (40.0)
                                                       ---------  ---------  ---------  -----------
Total provision......................................        0.1%       0.1%       0.1%        0.1%
                                                       ---------  ---------  ---------  -----------
                                                       ---------  ---------  ---------  -----------
</TABLE>
 
    The tax effects of  temporary differences that give  rise to deferred  taxes
were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                               --------------------   JUNE 30,
                                                                 1994       1995        1996
                                                               ---------  ---------  -----------
Deferred tax assets:
<S>                                                            <C>        <C>        <C>
  Expenses not currently deductible for tax purposes.........  $   1,504  $   2,182   $   1,995
  Senior discount note interest..............................     --          3,817       8,274
  Tax net operating loss and credit carryforwards............     18,939     30,910      40,723
  Research and development expenses capitalized for tax
   purposes..................................................      1,991      3,645       2,044
                                                               ---------  ---------  -----------
Total deferred tax assets....................................     22,434     40,554      53,036
Valuation allowance on deferred tax assets...................    (22,434)   (40,554)    (53,036)
                                                               ---------  ---------  -----------
Net deferred income taxes....................................  $  --      $  --       $  --
                                                               ---------  ---------  -----------
                                                               ---------  ---------  -----------
</TABLE>
 
    At  December 31, 1995,  the Company had net  operating loss carryforwards of
approximately $82,500,000 and $7,300,000 available to offset future federal  and
California   taxable  income,  respectively.  The   extent  to  which  the  loss
carryforwards can  be used  to  offset future  taxable  income may  be  limited,
depending  on the  extent of ownership  changes within any  three-year period as
provided in the  Tax Reform Act  of 1986  and the California  Conformity Act  of
1987.  Such  federal  carryforwards  expire in  2001  through  2010.  Such state
carryforwards expire in 1996 through 2000.
 
    Equity  issuances  in  April  1991  triggered  such  a  limitation  on  loss
carryforwards.  At  that  time,  the  Company  had  federal  net  operating loss
carryforwards  of   approximately  $10,500,000.   As  of   December  31,   1995,
approximately $4,000,000 of this net operating loss remains limited to an annual
usage   of  approximately  $1,400,000  for  federal  income  tax  purposes.  Any
significant stock  issuances  after December  31,  1995 will  likely  result  in
another  such ownership change. The annual limitation for utilization of the net
operating losses and tax credit carryforwards incurred up to the point of change
will be equal to the  fair market value of  the Company immediately before  such
change multiplied by the then current long-term tax exempt interest rate.
 
    The  Company  has  capitalized  approximately  $59,400,000  of  research and
development  expenditures  for  California  purposes  which  are  available  for
amortization  in future years. Realization of the deferred tax assets associated
with these  expenditures  is  contingent  upon the  amount  of  income  or  loss
apportioned to
 
                                      F-17
<PAGE>
                           CELLNET DATA SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
   (INFORMATION AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1996 IS
                                   UNAUDITED)
 
8.  INCOME TAXES (CONTINUED)
California during the subject amortization periods. Research and development tax
credit carryforwards of approximately $1,800,000 and $900,000 are also available
to offset future federal and California income taxes payable, respectively.
 
    A  valuation  allowance  has  been recorded  against  tax  assets  for which
realization is uncertain. Based upon  the Company's history of operating  losses
and  the expiration dates of the loss  carryforwards, the Company has recorded a
valuation allowance to the full extent of its net deferred tax assets.
 
9.  CONTINGENCIES AND COMMITMENTS
    The industry  in which  the Company  operates is  characterized by  frequent
litigation  regarding patent and other intellectual property rights. The Company
is party to a trademark claim. Although  the ultimate outcome of this matter  is
not  presently determinable,  management believes  that its  resolution will not
have a  material  effect on  the  Company's  financial position  or  results  of
operations.
 
    At  December 31, 1994 and 1995 and June  30, 1996, equipment with a net book
value of $456,000,  $854,000 and  $822,000 (net of  accumulated amortization  of
$1,495,000,  $372,000 and $536,000, respectively), has been leased under capital
leases.
 
    The  Company  leases  its  manufacturing  and  office  facilities  under   a
noncancelable  operating  lease which  expires in  December 2000.  Deferred rent
results from the difference  between facilities rent  expense recognized on  the
straight-line  basis over the term  of the lease as  compared to the contractual
payments made.
 
    Future minimum annual rental payments under capital and operating leases are
as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                             CAPITAL     OPERATING
YEARS ENDING DECEMBER 31,                                                                    LEASES       LEASES
- -----------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                        <C>          <C>
1996.....................................................................................  $       360   $   1,087
1997.....................................................................................          315       1,059
1998.....................................................................................          158       1,040
1999.....................................................................................           91       1,046
2000.....................................................................................           54       1,081
Thereafter...............................................................................      --              749
                                                                                           -----------  -----------
Total minimum lease payments.............................................................          978   $   6,062
                                                                                                        -----------
                                                                                                        -----------
Amount representing interest.............................................................         (158)
                                                                                           -----------
Present value of minimum lease payments..................................................  $       820
                                                                                           -----------
                                                                                           -----------
</TABLE>
 
    Facilities rent expense was $245,000,  $421,000, $901,000, and $599,000  for
1993,  1994, 1995 and for the six months ended June 30, 1996, respectively. Rent
expense is net of  sublease income of  $296,000 and $175,000  in 1993 and  1994,
respectively.
 
10. SUBSEQUENT EVENTS
   
    On  August 30,  1996 the  Company reincorporated  in Delaware.  The Board of
Directors of the Company approved a two-for-one split of all outstanding  shares
of  common stock  effective as  of September 5,  1996. All  shares and per-share
amounts have been adjusted to reflect this split.
    
 
                              *    *    *    *    *
 
                                      F-18
<PAGE>
   
THE CELLNET NETWORK ENABLES:
    
 
   
UTILITY APPLICATIONS
    
 
   
- -Time-of-use and demand energy rates
    
 
   
- -Real-time response to billing inquiries
    
 
   
- -Real-time power outage detection, location, and notification
    
 
   
- -On-demand meter reads
    
 
   
- -Customer-selected billing dates and consolidated, multi-location billing
    
 
   
- -Automatic move-in/move-out meter reading
    
 
   
- -Distribution automation
    
 
   
- -Internet access to consumption, rate, and billing information
    
 
   
FUTURE NON-UTILITY APPLICATIONS
    
 
   
- -Security services for home security, fire alarm, and personal safety devices
    
 
   
- -Remote status monitoring for vending, postage, change, and commercial washing
 machines; office and factory equipment; and intelligent home devices, such as
 remote-control thermostats
    
 
   
- -Intelligent transportation systems for traffic lights, parking meters, and toll
 booths
    
 
   
[Graphic: Collage showing various components and applications of the CellNet
          System.]
    
<PAGE>
                                     [LOGO]
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The   following  table  sets  forth  the  costs  and  expenses,  other  than
underwriting discounts and commissions, payable by the Registrant in  connection
with the sale of Common Stock being registered. All amounts are estimates except
the SEC registration fee and the NASD filing fee.
 
   
<TABLE>
<S>                                                               <C>
SEC registration fee............................................  $  41,635
NASD filing fee.................................................     17,750
Nasdaq National Market listing fee..............................     50,000
Printing and engraving costs....................................    150,000
Legal fees and expenses.........................................    375,000
Accounting fees and expenses....................................    300,000
Blue Sky fees and expenses......................................     22,500
Transfer Agent and Registrar fees...............................     10,000
Directors and Officers insurance coverage premiums..............    150,000
Miscellaneous expenses..........................................     83,115
                                                                  ---------
      Total.....................................................  $1,200,000
                                                                  ---------
                                                                  ---------
</TABLE>
    
 
- ---------
 
   
ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
    
 
    Article 7 of the Registrant's Restated Certificate of Incorporation provides
for  the indemnification  of directors to  the fullest  extent permissible under
Delaware law.
 
    Article 6 of  the Registrant's  Bylaws provides for  the indemnification  of
officers,  directors, employees  and agents  of the  corporation if  such person
acted in good faith and in a manner reasonably believed to be in and not opposed
to the  best interest  of the  corporation, and,  with respect  to any  criminal
action  or proceeding the indemnified party had no reason to believe his conduct
was unlawful.
 
    Section 145 of the Delaware General Corporation Law permits a corporation to
include in its charter documents, and in agreements between the corporation  and
its  directors and officers,  provisions expanding the  scope of indemnification
beyond that specifically provided by the current law.
 
    The  Registrant  has  entered  into  indemnification  agreements  with   its
directors  and  executive officers,  and intends  to enter  into indemnification
agreements with any new directors and executive officers in the future.
 
    The Underwriting  Agreement  filed  as  Exhibit  1.1  to  this  Registration
Statement provides for indemnification by the Underwriters of the Registrant and
its  officers  and directors,  and by  the Registrant  of the  Underwriters, for
certain liabilities arising under the Securities Act or otherwise.
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES
 
    Since January 1, 1993, the Registrant  has issued and sold (without  payment
of  any selling commission  to any person  except as noted  below) the following
unregistered securities:
 
   
        (1) From inception of  each respective plan,  the Registrant issued  and
    sold  an  aggregate  of  3,913,580  shares  of  Common  Stock  to employees,
    directors and consultants at  prices ranging from an  aggregate of $0.05  to
    $3.00,  upon exercise of incentive stock options under the Registrant's 1992
    Stock Option Plan and 1994 Stock  Plan, or as stock purchases in  connection
    with their employment with or services to the Company.
    
 
        (2)  In October 1993 and December  1993, the Registrant issued 2,963,530
    and 526,315 shares of Series BB Preferred Stock, respectively, and  warrants
    to purchase 661,625 and 105,263 shares of
 
                                      II-1
<PAGE>
   
    Series  BB Preferred Stock, respectively, to a  group of 73 investors for an
    aggregate cash purchase price of $16,576,763.75. The Company paid  placement
    fees of $419,783 to Hambrecht & Quist in connection with these issuances.
    
 
   
        (3)  In August 1994, the Registrant  issued and sold 3,215,768 shares of
    Series CC Preferred Stock, respectively, to  a group of 28 investors for  an
    aggregate  cash purchase price of $31,000,003.52. The Company paid placement
    fees of $639,805 to Barclay's Bank and $615,853 to Toronto Dominion Bank  in
    connection with these issuances.
    
 
        (4)  From December 1994 to February 1995, the Registrant issued and sold
    an aggregate of 646,830 shares of Series DD Preferred Stock to a group of 25
    investors for an aggregate cash purchase price of $6,235,441.20.
 
   
        (5) In June 1995  and December 1995, the  Registrant sold 235,000  units
    and 90,000 units consisting of $235,000,000 and $90,000,000 principal amount
    at  maturity,  respectively,  of  13% Senior  Discount  Notes  due  2005 and
    warrants to purchase 1,880,000 shares  and 720,000 shares, respectively,  of
    Common  Stock of the Company at an exercise price of $.005 per Warrant, to a
    group  of  qualified  institutional  buyers  and  accredited  and   offshore
    investors  for  aggregate cash  proceeds of  $171,616,925. The  Company paid
    placement fees of $4,220,085 to Smith Barney Inc. and $1,050,000 to  Toronto
    Dominion Bank in connection with these issuances.
    
 
   
        (6)  Concurrently with the closing of  the Offering, the Registrant will
    issue an aggregate of  1,470,833 shares of Common  Stock to Northern  States
    Power  Company  ("NSP")  and  Union  Electric  Company,  each  of  which are
    accredited investors, for aggregate cash proceeds of $25,000,000. 104,167 of
    the shares to be issued to NSP will be deposited into escrow and released to
    NSP upon the achievement of certain customer milestones. If such  milestones
    are  not met by December 31, 1997,  such shares will released from escrow to
    the Registrant.
    
 
    The sales of the above securities were deemed to be exempt from registration
under the Securities Act in reliance on  Section 4(2) of the Securities Act,  or
Regulation  D promulgated thereunder, or Rule 701 promulgated under Section 3(b)
of the  Securities Act,  as transactions  by an  issuer not  involving a  public
offering  or transactions pursuant  to compensatory benefit  plans and contracts
relating to compensation  as provided  under such  Rule 701.  The recipients  of
securities  in each such transaction represented  their intention to acquire the
securities for investment only and not with a view to or for sale in  connection
with  any distribution thereof and appropriate legends were affixed to the share
certificates and warrants issued in such transactions.
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (A)  EXHIBITS
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION
- -----------  -------------------------------------------------------------------------------------------
<C>          <S>
  1.1**      Form of Underwriting Agreement.
  3.1A*      Restated Certificate of Incorporation.
  3.1B**     Form of Restated Certificate of Incorporation to be filed upon the closing of the offering
              made under this Registration Statement.
  3.2*       Bylaws.
  4.1**      Specimen Common Stock Certificate.
  4.2*       Indenture between the Company and the Bank of New York dated June 15, 1995, including form
              of Senior Discount Note.
  4.3*       Warrant Agreement between the Company and the Bank of New York dated June 15, 1995,
              including form of Warrant.
</TABLE>
    
 
                                      II-2
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION
- -----------  -------------------------------------------------------------------------------------------
<C>          <S>
  4.4*       Notes Registration Rights Agreement dated June 15, 1995 by and between the Company and
              Smith Barney Inc.
  4.5*       Warrants Registration Rights Agreement dated June 15, 1995 by and between the Company and
              Smith Barney Inc.
  4.6*       First Supplemental Indenture between the Company and the Bank of New York dated November
              21, 1995.
  4.7*       First Supplemental Warrant Agreement between the Company and the Bank of New York dated
              November 21, 1995.
  4.8*       First Supplemental Notes Registration Rights Agreement dated November 21, 1995 by and
              between the Company and Smith Barney Inc.
  4.9*       First Supplemental Warrants Registration Rights Agreement dated November 21, 1995 by and
              between the Company and Smith Barney Inc.
  4.10*      Form of Warrant to purchase shares of Series BB Preferred Stock.
  4.11*      Warrant Agreement between the Company and Axonn Corporation dated August 12, 1992.
  4.12*      Form of Warrant Agreement between the Company and Diablo Research Corporation.
  4.13*      Form of Series E Warrant.
  4.14       Stock Purchase Agreement dated September 6, 1996 between the Company and Northern States
              Power Company.
  4.15       Stock Purchase Agreement dated September 4, 1996 between the Company and Union Electric
              Development Corporation.
  5.1        Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
 10.1*       Form of Indemnification Agreement for directors and officers.
 10.2(a)*    1992 Stock Option Plan and forms of agreements thereunder.
 10.2(b)*    1994 Stock Plan and forms of agreements thereunder.
 10.3*       1996 Employee Stock Purchase Plan.
 10.4*       Shareholders' Agreement between the Company and certain shareholders dated August 15, 1994,
              as amended by Amendment No. 1 on December 22, 1994, Amendment No. 2 on June 15, 1995 and
              Amendment No. 3 on November 21, 1995.
 10.5*       Lease between the Company and WDT Shoreway dated April 6, 1989 for the Company's San Carlos
              headquarters.
 10.6*       Restricted Stock Purchase Agreement between the Company and John Seidl dated December 27,
              1994.
 10.7*       Restricted Stock Purchase Agreement between the Company and James Jennings dated August 1,
              1995.
 10.8*       Restricted Stock Purchase Agreement between the Company and Philip Mallory dated July 21,
              1995.
 10.9*       Restricted Stock Purchase Agreement between the Company and Larsh Johnson dated August 1,
              1995.
 10.10+*     License Agreement between the Company and Axonn Corporation dated August 21, 1992, as
              amended by an Addendum and a Second Addendum, each dated November 8, 1993.
</TABLE>
    
 
                                      II-3
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION
- -----------  -------------------------------------------------------------------------------------------
<C>          <S>
 10.11+*     License Agreement between the Company and Axonn Corporation dated March 25, 1996.
 10.12+*     License Agreement between the Company and Life Point Systems Limited Partnership dated
              August 12, 1994.
 10.13*      Agreement between the Company and James Jennings dated July 11, 1994.
 10.14*      Form of Employee Severance Agreement
 10.15*      Purchase Agreement between the Company and Smith Barney Inc. dated June 15, 1995.
 10.16*      Purchase Agreement between the Company and Smith Barney Inc. dated November 21, 1995.
 10.17*      Form of Promissory Note between the Company and certain officers of the Company in
              connection with the purchase of restricted stock.
 11.1        Statement regarding computation of per share earnings.
 21.1*       Subsidiaries of the Registrant.
 23.1        Independent Auditors' Consent and Report on Schedule.
 23.3        Consent of Counsel (included in Exhibit 5.1).
 24.1*       Power of Attorney.
 27.1        Financial Data Schedule
</TABLE>
    
 
- ---------
   
 * Filed previously.
    
   
** To be filed by amendment.
    
 + Confidential treatment requested as to a portion of this exhibit.
 
    (B)  FINANCIAL STATEMENT SCHEDULES
 
    Schedules not  listed  above  have  been  omitted  because  the  information
required  to be set forth therein is not applicable or is shown in the financial
statements or notes thereto.
 
    The following  financial  statement  schedule  is  filed  as  part  of  this
Registration Statement:
 
        Schedule II -- Valuation and Qualifying Accounts and Reserves.
 
ITEM 17.  UNDERTAKINGS
 
    The  undersigned Registrant hereby undertakes to provide to the Underwriters
at the  closing specified  in the  Underwriting Agreement  certificates in  such
denominations  and registered in  such names as required  by the Underwriters to
permit prompt delivery to each purchaser.
 
    Insofar as indemnification by the  Registrant for liabilities arising  under
the  Securities  Act may  be permitted  to  directors, officers  and controlling
persons of the Registrant  pursuant to the provisions  referenced in Item 14  of
this  Registration Statement or otherwise, the  Registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is
against public policy  as expressed in  the Securities Act,  and is,  therefore,
unenforceable.  In  the  event that  a  claim for  indemnification  against such
liabilities (other than the  payment by the Registrant  of expenses incurred  or
paid  by a  director, officer,  or controlling person  of the  Registrant in the
successful defense  of any  action,  suit or  proceeding)  is asserted  by  such
director,  officer or controlling person in connection with the securities being
registered hereunder, the Registrant will, unless in the opinion of its  counsel
the  matter has  been settled  by controlling  precedent, submit  to a  court of
appropriate jurisdiction  the question  whether such  indemnification by  it  is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
                                      II-4
<PAGE>
    The undersigned registrant hereby undertakes that:
 
        (1)  For purposes of determining any liability under the Securities Act,
    the information omitted from  the form of Prospectus  filed as part of  this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    Prospectus  filed by  the Registrant  pursuant to  Rule 424(b)(1)  or (4) or
    497(h) under  the  Securities  Act  shall  be deemed  to  be  part  of  this
    Registration Statement as of the time it was declared effective.
 
        (2)  For the purpose  of determining any  liability under the Securities
    Act, each post-effective amendment that contains a form of Prospectus  shall
    be  deemed to  be a  new registration  statement relating  to the securities
    offered therein, and the offering of  such securities at that time shall  be
    deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
   
    Pursuant  to the requirements of the Securities Act, the Registrant has duly
caused this Amendment to the Registration  Statement to be signed on its  behalf
by  the undersigned, thereunto duly authorized, in the City of San Carlos, State
of California on the 9th day of September, 1996.
    
 
                                          CELLNET DATA SYSTEMS, INC.
 
                                          By:          /s/ JOHN M. SEIDL
                                             -----------------------------------
                                                       John M. Seidl,
   
                                                PRESIDENT AND CHIEF EXECUTIVE
                                                           OFFICER
    
 
   
    Pursuant to the requirements of the Securities Act of 1933, as amended, this
Amendment to the Registration Statement has been signed by the following persons
in the capacities and on the dates indicated:
    
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                       TITLE                         DATE
- ------------------------------------------------------  ---------------------------------  ----------------------
<C>                                                     <S>                                <C>
                     /s/ JOHN M. SEIDL                  President, Chief Executive
     -------------------------------------------         Officer and Director (Principal     September 9, 1996
                   (John M. Seidl)                       Executive Officer)
 
                                                        Vice President and Chief
                    /s/ PAUL G. MANCA*                   Financial Officer (Principal
     -------------------------------------------         Financial and Accounting            September 9, 1996
                   (Paul G. Manca)                       Officer)
 
                     /s/ PAUL M. COOK*
     -------------------------------------------        Chairman of the Board, Director      September 9, 1996
                    (Paul M. Cook)
 
                   /s/ NEAL M. DOUGLAS*
     -------------------------------------------        Director                             September 9, 1996
                  (Neal M. Douglas)
 
                 /s/ WILLIAM C. EDWARDS*
     -------------------------------------------        Director                             September 9, 1996
                 (William C. Edwards)
 
                     /s/ WILLIAM HART*
     -------------------------------------------        Director                             September 9, 1996
                    (William Hart)
 
                     /s/ BRIAN KWAIT*
     -------------------------------------------        Director                             September 9, 1996
                    (Brian Kwait)
 
                   /s/ NANCY E. PFUND*
     -------------------------------------------        Director                             September 9, 1996
                   (Nancy E. Pfund)
 
                    /s/ PAUL J. SALEM*
     -------------------------------------------        Director                             September 9, 1996
                   (Paul J. Salem)
 
                  /s/ HENRY B. SARGENT*
     -------------------------------------------        Director                             September 9, 1996
                  (Henry B. Sargent)
</TABLE>
    
 
   
*By:       /s/ JOHN M. SEIDL
    
- ------------------------------------
   
            (John M. Seidl)
    
   
           (ATTORNEY-IN-FACT)
    
 
                                      II-6
<PAGE>
                                                                     SCHEDULE II
 
                           CELLNET DATA SYSTEMS, INC.
                 VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                                ADDITIONS
                                                                  ADDITIONS                   (DEDUCTIONS):
                                                  BALANCE AT     CHARGED TO     DEDUCTIONS:     TRANSFERS
                                                 BEGINNING OF     COSTS AND    WRITE-OFFS OF     BETWEEN      BALANCE AT
                                                     YEAR         EXPENSES       ACCOUNTS       ACCOUNTS      END OF YEAR
                                                 -------------  -------------  -------------  -------------  -------------
<S>                                              <C>            <C>            <C>            <C>            <C>
Allowance for doubtful accounts receivable
  Year ended December 31:
    1993.......................................    $      60      $  --          $  --          $      (1)     $      59
    1994.......................................           59         --             --                (34)            25
    1995.......................................           25         --             --             --                 25
 
Warranty reserves
  Year ended December 31:
    1993.......................................    $     495      $     315      $    (110)        --          $     700
    1994.......................................          700             20           (624)            34            130
    1995.......................................          130             16           (131)        --                 15
</TABLE>
    
 
                                      S-1
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION                                                                         PAGE
- -----------  --------------------------------------------------------------------------------  ---------
<C>          <S>                                                                               <C>
  1.1**      Form of Underwriting Agreement..................................................
  3.1A*      Restated Certificate of Incorporation.
  3.1B**     Form of Restated Certificate of Incorporation to be filed upon the closing of
              the offering made under this Registration Statement.
  3.2*       Bylaws.
  4.1**      Specimen Common Stock Certificate...............................................
  4.2*       Indenture between the Company and the Bank of New York dated June 15, 1995,
              including form of Senior Discount Note.
  4.3*       Warrant Agreement between the Company and the Bank of New York dated June 15,
              1995, including form of Warrant.
  4.4*       Notes Registration Rights Agreement dated June 15, 1995 by and between the
              Company and Smith Barney Inc.
  4.5*       Warrants Registration Rights Agreement dated June 15, 1995 by and between the
              Company and Smith Barney Inc.
  4.6*       First Supplemental Indenture between the Company and the Bank of New York dated
              November 21, 1995.
  4.7*       First Supplemental Warrant Agreement between the Company and the Bank of New
              York dated November 21, 1995.
  4.8*       First Supplemental Notes Registration Rights Agreement dated November 21, 1995
              by and between the Company and Smith Barney Inc.
  4.9*       First Supplemental Warrants Registration Rights Agreement dated November 21,
              1995 by and between the Company and Smith Barney Inc.
  4.10*      Form of Warrant to purchase shares of Series BB Preferred Stock.
  4.11*      Warrant Agreement between the Company and Axonn Corporation dated August 12,
              1992.
  4.12*      Form of Warrant Agreement between the Company and Diablo Research Corporation.
  4.13*      Form of Series E Warrant.
  4.14       Stock Purchase Agreement dated September 6, 1996 between the Company and
              Northern States Power Company..................................................
  4.15       Stock Purchase Agreement dated September 4, 1996 between the Company and Union
              Electric Development Corporation...............................................
  5.1        Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation...........
 10.1*       Form of Indemnification Agreement for directors and officers.
 10.2(a)*    1992 Stock Option Plan and forms of agreements thereunder.
 10.2(b)*    1994 Stock Plan and forms of agreements thereunder.
 10.3*       1996 Employee Stock Purchase Plan.
 10.4*       Shareholders' Agreement between the Company and certain shareholders dated
              August 15, 1994, as amended by Amendment No. 1 on December 22, 1994, Amendment
              No. 2 on June 15, 1995 and Amendment No. 3 on November 21, 1995.
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION                                                                         PAGE
- -----------  --------------------------------------------------------------------------------  ---------
<C>          <S>                                                                               <C>
 10.5*       Lease between the Company and WDT Shoreway dated April 6, 1989 for the Company's
              San Carlos headquarters.
 10.6*       Restricted Stock Purchase Agreement between the Company and John Seidl dated
              December 27, 1994.
 10.7*       Restricted Stock Purchase Agreement between the Company and James Jennings dated
              August 1, 1995.
 10.8*       Restricted Stock Purchase Agreement between the Company and Philip Mallory dated
              July 21, 1995.
 10.9*       Restricted Stock Purchase Agreement between the Company and Larsh Johnson dated
              August 1, 1995.
 10.10+*     License Agreement between the Company and Axonn Corporation dated August 21,
              1992, as amended by an Addendum and a Second Addendum, each dated November 8,
              1993.
 10.11+*     License Agreement between the Company and Axonn Corporation dated March 25,
              1996.
 10.12+*     License Agreement between the Company and Life Point Systems Limited Partnership
              dated August 12, 1994.
 10.13*      Agreement between the Company and James Jennings dated July 11, 1994.
 10.14*      Form of Employee Severance Agreement
 10.15*      Purchase Agreement between the Company and Smith Barney Inc. dated June 15,
              1995.
 10.16*      Purchase Agreement between the Company and Smith Barney Inc. dated November 21,
              1995.
 10.17*      Form of Promissory Note between the Company and certain officers of the Company
              in connection with the purchase of restricted stock.
 11.1        Statement regarding computation of per share earnings.
 21.1*       Subsidiaries of the Registrant.
 23.1        Independent Auditors' Consent and Report on Schedule............................
 23.3        Consent of Counsel (included in Exhibit 5.1)....................................
 24.1*       Power of Attorney...............................................................
 27.1        Financial Data Schedule.........................................................
</TABLE>
    
 
- ---------
   
 * Filed previously.
    
   
** To be filed by amendment.
    
 + Confidential treatment requested as to a portion of this exhibit.

<PAGE>










                            STOCK PURCHASE AGREEMENT

                                  BY AND AMONG

                           CELLNET DATA SYSTEMS, INC.

                                       AND

                          NORTHERN STATES POWER COMPANY



                          DATED AS OF SEPTEMBER 6, 1996









<PAGE>

                                TABLE OF CONTENTS


                                                                          PAGE

SECTION 1.  PURCHASE AND SALE OF SHARES. . . . . . . . . . . . . . . . . . . 1

     1.1    Authorization of Shares. . . . . . . . . . . . . . . . . . . . . 1
     1.2    Sale of the Shares . . . . . . . . . . . . . . . . . . . . . . . 1
     1.3    Closing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SECTION 2.  OTHER AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . . . 4

     2.1    Restrictions on Transfer of Common Stock . . . . . . . . . . . . 4
     2.2    Future Public Offerings. . . . . . . . . . . . . . . . . . . . . 5

SECTION 3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY. . . . . . . . . . 5

     3.1    Organization, Good Standing and Qualification. . . . . . . . . . 5
     3.2    Authorization. . . . . . . . . . . . . . . . . . . . . . . . . . 5
     3.3    No Conflict. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     3.4    Governmental Consents. . . . . . . . . . . . . . . . . . . . . . 6
     3.5    Final Prospectus . . . . . . . . . . . . . . . . . . . . . . . . 6

SECTION 4.  REPRESENTATIONS AND WARRANTIES OF THE PURCHASER. . . . . . . . . 6

     4.1    Purchase of Securities . . . . . . . . . . . . . . . . . . . . . 6
     4.2    Legends. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     4.3    Authorization. . . . . . . . . . . . . . . . . . . . . . . . . . 7
     4.4    Investment Experience. . . . . . . . . . . . . . . . . . . . . . 7
     4.5    Accredited Investor. . . . . . . . . . . . . . . . . . . . . . . 7
     4.6    Restricted Securities; Rule 144. . . . . . . . . . . . . . . . . 7
     4.7    Access to Data . . . . . . . . . . . . . . . . . . . . . . . . . 8

SECTION 5.  CONDITIONS TO THE PURCHASER'S OBLIGATIONS. . . . . . . . . . . . 8

     5.1    Opinion of Counsel . . . . . . . . . . . . . . . . . . . . . . . 8
     5.2    Representations and Warranties . . . . . . . . . . . . . . . . . 8
     5.3    Compliance with this Agreement . . . . . . . . . . . . . . . . . 8
     5.4    Legal Investment . . . . . . . . . . . . . . . . . . . . . . . . 8
     5.5    Securities Law Compliance. . . . . . . . . . . . . . . . . . . . 8
     5.6    Consents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

                                       -i-

<PAGE>

                                TABLE OF CONTENTS
                                   (CONTINUED)
                                                                          PAGE
SECTION 6.  CONDITIONS TO THE COMPANY'S OBLIGATIONS. . . . . . . . . . . . . 9

     6.1    Opinion of Counsel . . . . . . . . . . . . . . . . . . . . . . . 9
     6.2    Representations and Warranties . . . . . . . . . . . . . . . . . 9
     6.3    Compliance with this Agreement . . . . . . . . . . . . . . . . . 9
     6.4    Legal Investment . . . . . . . . . . . . . . . . . . . . . . . . 9
     6.5    Securities Law Compliance. . . . . . . . . . . . . . . . . . . . 9
     6.6    Consents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SECTION 7.  REGISTRATION RIGHTS. . . . . . . . . . . . . . . . . . . . . . .10

     7.1    Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . .10
     7.2    Registration Procedures and Expenses . . . . . . . . . . . . . .10
     7.3    Indemnification. . . . . . . . . . . . . . . . . . . . . . . . .11
     7.4    Information Available. . . . . . . . . . . . . . . . . . . . . .12
     7.5    Rule 144 Reporting . . . . . . . . . . . . . . . . . . . . . . .12
     7.6    Temporary Cessation of Offers and Sales by Purchaser . . . . . .13
     7.7    Transfer of Shares After Registration. . . . . . . . . . . . . .13
     7.8    Termination of Obligations . . . . . . . . . . . . . . . . . . .13

SECTION 8.  MISCELLANEOUS. . . . . . . . . . . . . . . . . . . . . . . . . .14

     8.1    Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
     8.2    Successors and Assigns . . . . . . . . . . . . . . . . . . . . .14
     8.3    Entire Agreement; Amendment. . . . . . . . . . . . . . . . . . .14
     8.4    Counterparts . . . . . . . . . . . . . . . . . . . . . . . . . .15
     8.5    Governing Law. . . . . . . . . . . . . . . . . . . . . . . . . .15
     8.6    Survival of Representations and Warranties . . . . . . . . . . .15
     8.7    Termination or Modification of Agreement . . . . . . . . . . . .15

                                      -ii-

<PAGE>

                            STOCK PURCHASE AGREEMENT

     This Stock Purchase Agreement (this "AGREEMENT") is made as of September 
6, 1996, by and among CellNet Data Systems, Inc., a Delaware corporation 
(the "COMPANY") and Northern States Power Company, a Minnesota corporation 
(the "PURCHASER").

     WHEREAS, the Company and Purchaser have entered into the CellNet MSP and
NSP Data Services Agreement dated as of August 30, 1996, providing for at least
1,000,000 meters (the "Data Services Agreement");

     WHEREAS, the Company has determined that it is in the best interests of the
Company and its stockholders for the Purchaser to make the investment in the
Company provided for, and on the terms and conditions set forth, in this
Agreement; and

     WHEREAS, the Purchaser desires to make such investment on such terms and
conditions.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and conditions herein contained, the Company and the Purchaser hereby agree as
follows:

                 SECTION 1.  PURCHASE AND SALE OF SHARES

     1.1  AUTHORIZATION OF SHARES.  The Company has authorized the issuance 
of shares of its Common Stock, par value $.001 per share (the "SHARES") 
sufficient to meet the purposes of Section 1.2.

     1.2  SALE OF THE SHARES.  Subject to the terms and conditions hereof, 
the Company will issue and sell to the Purchaser, and the Purchaser will 
purchase from the Company, at the Closing, a number of Shares pursuant to the 
calculations and conditions listed in Section 1.2(b) below.

          (a)  DEFINITIONS.

               (i)  PURCHASE PRICE.  The aggregate purchase price paid by the 
Purchaser (the "Aggregate Purchase Price" or "APP") for the Shares shall be 
equal to $15,000,000, provided the Aggregate Purchase Price shall be reduced 
if, and only to the extent necessary, so that the number of shares (including 
the Escrow Shares as defined below) purchased does not equal or exceed five 
percent (5%) of the outstanding voting securities of the Company.

               (ii) FORMULA.  In Section 1.2(b) a formula is used to 
determine the number of Shares sold to the Purchaser for the Aggregate 
Purchase Price, and of these Shares, the number of Shares placed in escrow 
(the "Escrow Shares"), and the number of Escrow Shares to be released from 
escrow.  The formula is:  the number of Shares equals a quotient where the 
numerator is





<PAGE>

the Aggregate Purchase Price and the denominator is the Offering 
Price Per Share of the Company's Common Stock at the Initial Public Offering 
(the "Offering Price" or "OP") multiplied by an Adjustment Factor ( the 
"Adjustment Factor" or "AF")). Algebraically:  number of Shares = APP/(OP*AF).

               (iii)  ESCROW SHARES.  The escrow shares are the number of 
Shares determined by Section 1.2(b)(i) that will be placed in escrow and held 
by the Company as Escrow Agent.  The Escrow Shares placed in escrow will be 
governed by this Agreement and an Escrow Agreement (the "Escrow Agreement").

               (iv)   CONDITION (A).  Condition (A) is satisfied if the 
Purchaser provides to the Company by September 16, 1996, a letter of intent 
signed with Wisconsin Electric Power Company ("WEPCO") or a Controlled 
Corporation (as defined in Section 2.1(c) herein) of WEPCO to enter into a 
services agreement for at least 750,000 meters with meter routes with an 
average density of at least 250 meters per square mile.  The Company has the 
sole right exercisable in its sole discretion to extend the completion of 
Condition (A) after September 16, 1996, through a written notice to the 
Purchaser.

               (v)    CONDITION (B).  Condition (B) is satisfied if the 
Purchaser provides to the Company by December 31, 1997, a services agreement 
signed with WEPCO for at least 750,000 meters with meter routes with an 
average density of at least 250 meters per square mile.

               (vi)   OFFERING PRICE PER SHARE.  The Offering Price Per Share 
shall be the price at which the Company's Common Stock is sold to the public 
in the Initial Public Offering.

               (vii)  INITIAL PUBLIC OFFERING means the sale of Common Stock 
by the Company to the public in a firm commitment underwriting pursuant to an 
effective registration statement filed with the Securities and Exchange 
Commission (the "SEC").

          (b)  SHARES PURCHASED AND ESCROW OF SHARES.

               (i)    Purchaser will purchase from Company a number of Shares 
equal to the number of Shares determined by the Formula where the AF equals 
 .80. The Company shall deliver to Purchaser at the Closing a stock 
certificate for the number of Shares as so determined less the number of the 
Escrow Shares.  The number of Escrow Shares will equal the number of Shares 
computed when using the Formula where AF equals .80, minus the number of 
Shares computed when using the Formula where AF equals .90.  The Company 
shall deliver a stock certificate for the Escrow Shares to the Escrow Agent 
at the Closing.

               (ii)   If Condition (A) is satisfied by September 16, 1996 (or 
such later date as the Company permits), the number of Escrow Shares released 
from escrow to the Purchaser will equal the number of Shares computed when 
using the Formula where AF equals .85, minus the number of Shares computed 
when using the Formula where AF equals .90.

                                       -2-

<PAGE>


               (iii)  If Condition (A) is satisfied and Condition (B) is 
satisfied by December 31, 1997, the remaining Escrow Shares shall be released 
from escrow to the Purchaser.

               (iv)   If Condition (A) is not satisfied and Condition (B) is 
satisfied by December 31, 1997, the number of Escrow Shares released from 
escrow to the Purchaser will equal the number of Shares computed when using 
the Formula where AF equals .85, minus the number of Shares computed when 
using the Formula where AF equals .90.

               (v)    If Condition (A) is not satisfied by September 16, 1996 
(or such later date as the Company permits), the number of Escrow Shares 
released from escrow to the Company and cancelled will equal the number of 
Shares computed when using the Formula where AF equals .80, minus the number 
of Shares computed when using the Formula where AF equals .85.

               (vi)   If Condition (A) is not satisfied by September 16, 1996 
(or such later date as the Company permits) and Condition (B) is not 
satisfied by December 31, 1997 (or such later date as the Company permits), 
all Escrow Shares shall be released from escrow to the Company and cancelled.

               (vii)  If Condition (A) is satisfied and Condition (B) is not 
satisfied by December 31, 1997, (or such later date as the Company permits), 
all remaining Escrow Shares shall be released from escrow to the Company and 
cancelled.

               (viii) The number of shares shall be rounded to the nearest 
whole share as necessary.

     1.3  CLOSING.

          (a)  The purchase and sale of the Shares shall take place at a 
closing (the "CLOSING") to be held at the offices of Wilson, Sonsini, 
Goodrich & Rosati, 650 Page Mill Road, Palo Alto, CA 94304-1050, concurrent 
with the closing of the Company's Initial Public Offering (the "CLOSING 
DATE"), or at such other place as the Purchaser and the Company shall agree.  
This Agreement shall terminate and be of no further force and effect if the 
closing of the Initial Public Offering does not occur on or before June 30, 
1997.

          (b)  On the Closing Date, subject to the conditions stated herein, 
the Company will deliver to the Purchaser and the Escrow Agent stock 
certificates representing the number of Shares to be purchased by such 
Purchaser as provided in Section 1.2(b)(i) against payment to the Company by 
certified check or wire transfer of the purchase price therefor in federal or 
other immediately available funds.

                                       -3-

<PAGE>

                           SECTION 2.  OTHER AGREEMENTS

     1.4  RESTRICTIONS ON TRANSFER OF COMMON STOCK.

          (a)  The Purchaser shall not, directly or indirectly, sell or 
transfer any Common Stock purchased under this Agreement for a period of two 
years after the Closing Date except as permitted by and in accordance with 
Section 2.1(b)and Section 2.1(c).

          (b)  Notwithstanding Section 2.1(a), one year after the Closing Date
Agreement, Purchaser shall be able to, directly or indirectly, sell or transfer
one-half of the Common Stock received on the Closing Date, including one-half of
any Escrow Shares released to Purchaser.

          (c)  Notwithstanding Section 2.1(a), the Purchaser shall be able to 
sell or transfer any Common Stock purchased under this Agreement at any time 
(i) to the Company or any person or group approved by the Company (such 
approval to be granted or withheld in its sole discretion); or (ii) to a 
corporation of which the Purchaser owns not less than 80% of the voting power 
entitled to be cast in the election of the Purchaser's directors or a 
corporation which owns directly or indirectly not less than 80% of the voting 
power entitled to be cast in the election of the Purchaser's directors or a 
corporation which directly or indirectly is under common control with the 
Purchaser through the ownership of not less then 80% of the voting power 
entitled to be cast in the election of directors of the affiliated 
corporation (any of such corporation being referred to as a "Controlled 
Corporation"), so long as such Controlled Corporation agrees to hold such 
Common Stock subject to all the provisions of this Agreement, and agrees to 
transfer such Common Stock to the Purchaser or another Controlled Corporation 
of the Purchaser if it ceases to be a Controlled Corporation of the 
Purchaser; or (iii) in response to (1) an offer to purchase or exchange for 
cash or other consideration any Common Stock (a) which is made by or on 
behalf of the Company, or (b) which is made by another person or group and is 
not opposed by the Board of Directors of the Company within the time such 
Board is required, pursuant to regulations under the Securities Exchange Act 
of 1934, to advise the Company's stockholders of such Board's position on 
such offer, or (2) any other offer made by another person or group to 
purchase or exchange for cash or other consideration any Common Stock which, 
if successful, would result in such person or group owning or having the 
right to acquire Common Stock representing more than 40% of the total Common 
Stock of the Company then outstanding; or (iv) pursuant to a bona fide pledge 
of such Common Stock to an institutional lender to secure a loan, guarantee 
or other financial support, provided that such lender agrees to hold such 
Common Stock subject to all provisions of this Agreement and any sale or 
disposition by such lender of such pledged Common Stock shall be subject to 
the limitations of this Section 2.1; or (v) in the event of a merger or 
consolidation in which the holders of Common Stock of the Company prior to 
the merger or consolidation cease to hold, directly or indirectly, at least 
51% of the Common Stock of the surviving entity, or (vi) pursuant to a plan 
of liquidation of the Company. Notwithstanding Section 2.1(a) and subject to 
compliance with all securities laws applicable to restricted securities, 
Purchaser shall be entitled to sell or transfer not more than one-half of the

                                       -4-

<PAGE>

Common Stock received on the Closing Date, including one-half of the Escrow 
Shares, to WEPCO or a Controlled Corporation (as defined above substituting 
WEPCO for Purchaser in such definition) of WEPCO.

     2.2  FUTURE PUBLIC OFFERINGS.  Purchaser will have the right to 
participate in future public offerings of newly issued Common Stock by the 
Company within two years after the Closing Date.  Purchaser shall be entitled 
to purchase a percentage of the shares issued in the new offering determined 
by dividing (A) the number of Shares of Common Stock acquired by Purchaser 
pursuant to this Agreement and owned on the date of such public offering by 
(B) the number of shares of Common Stock of the Company outstanding on such 
date, before giving effect to the shares to be issued in such public 
offering. Notwithstanding the foregoing, if Purchaser has acquired additional 
shares of Common Stock of the Company not pursuant to this Agreement, then 
Purchaser may not acquire shares of Common Stock from the Company in the new 
offering to the extent the percentage ownership held by the Purchaser of the 
Company's Common Stock outstanding after such new offering exceeds such 
percentage ownership held by Purchaser immediately after the Initial Public 
Offering (giving effect to any Escrow Shares released to Purchaser).  Such 
participation by the Purchaser will be on the same terms and conditions as 
the public investors and the shares shall be purchased from the underwriters.

     The Company shall notify Purchaser in writing promptly after any filing
with the SEC for any such offering and Purchaser will advise the Company
promptly in light of the proposed schedule of the offering of Purchaser's
election whether or not to participate.

            SECTION 3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company hereby represents and warrants to the Purchaser that:

     3.1  ORGANIZATION, GOOD STANDING AND QUALIFICATION.  The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has all requisite power and authority to carry on
its business as now conducted and as proposed to be conducted in the future.
The Company is duly qualified to transact business and is in good standing in
each jurisdiction in which the failure to so qualify would have a material
adverse effect on its business or properties.

     3.2  AUTHORIZATION.  The Company has all corporate right, power and
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.  All corporate action on the part of the Company, its
officers, directors and stockholders necessary for (i) the authorization,
execution and delivery of this Agreement and the issuance of the Shares and (ii)
the performance of all obligations of the Company hereunder has been taken.
This Agreement has been duly executed and delivered by the Company and
constitutes the valid and legally binding obligation of the Company, enforceable
in accordance with its terms, subject to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws affecting creditors' rights and
remedies generally and rules of law governing specific performance, injunctive
relief and other equitable remedies and to


                                       -5-

<PAGE>




limitations of public policy as they may apply to the indemnification 
provisions set forth in Section 7.3 of this Agreement.  Upon their issuance 
and delivery pursuant to this Agreement, the Shares will be validly issued, 
fully paid and nonassessable and will be free of any liens or encumbrances; 
provided, however, that the Shares are subject to restrictions on transfer 
under state and/or federal securities laws.  The issuance and sale of the 
Shares will not give rise to any preemptive right or right of first refusal 
or right of participation on behalf of any person.

     3.3  NO CONFLICT.  The execution and delivery of this Agreement do not, and
the consummation of the transactions contemplated hereby will not, conflict
with, or result in any violation of, or default (with or without notice or lapse
of time, or both), or give rise to a right of termination, cancellation or
acceleration of any obligation or to a loss of a material benefit, under, any
provision of the Restated Certificate of Incorporation or Bylaws of the Company
or any material mortgage, indenture, lease or other agreement or instrument,
permit, concession, franchise, license, judgment, order, decree, statute, law,
ordinance, rule or regulation applicable to the Company, its properties or
assets.

     3.4  GOVERNMENTAL CONSENTS.  No consent, approval, order or authorization
of, or registration, qualification, designation, declaration or filing with, any
federal, state, local or provincial governmental authority on the part of the
Company is required in connection with the consummation of the transactions
contemplated by this Agreement, except for any post-sale filings pursuant to
applicable state securities laws, which filings will be effected within the
applicable time periods.  The offer and sale of the Shares pursuant to the terms
of this Agreement are exempt from the registration requirements of Section 5 of
the Securities Act of 1933, as amended (the "SECURITIES ACT").

     3.5  FINAL PROSPECTUS.  The Company's Prospectus for the Initial Public
Offering as filed with the Securities and Exchange Commission pursuant to
Rule 424 shall not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were made, not
misleading.

           SECTION 4.  REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

     The Purchaser hereby represents and warrants that:

     4.1  PURCHASE OF SECURITIES.  The Purchaser is purchasing the Shares for
investment for its own account, not as nominee or agent, and not with a view to
the distribution or resale thereof, subject, nevertheless, to any requirement of
law that the disposition of its property shall be at all times within its
control.  The Purchaser will not, in any event, make any sale or other
disposition of such securities in contravention of the Securities Act and the
rules and regulations of the Securities and Exchange Commission thereunder.

     4.2  LEGENDS.  The Purchaser understands that the certificates evidencing
the Shares shall bear legends in the following form:

                                       -6-

<PAGE>

          "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
          ACT OF 1933.  THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR
          HYPOTHECATED IN THE ABSENCE OF A REGISTRATION STATEMENT IN EFFECT
          WITH RESPECT TO THE SECURITIES UNDER SUCH ACT OR AN OPINION OF
          COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
          REQUIRED."

          "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
          CERTAIN RESTRICTIONS ON TRANSFER AS SET FORTH IN THE STOCK
          PURCHASE AGREEMENT BETWEEN THE

          ISSUER AND THE ORIGINAL HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE
          OBTAINED AT THE PRINCIPAL OFFICE OF THE ISSUER.  SUCH TRANSFER
          RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES."

     4.3  AUTHORIZATION.  The Purchaser has all corporate right, power and
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.  All corporate action on the part of the Purchaser, its
officers, directors and stockholders necessary for (i) the authorization,
execution and delivery of this Agreement and (ii) the performance of all
obligations of the Purchaser hereunder has been taken.  This Agreement has been
duly executed and delivered by the Purchaser and constitutes the valid and
legally binding obligation of the Purchaser, enforceable in accordance with its
terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium
and similar laws affecting creditors' rights and remedies generally and rules of
law governing specific performance, injunctive relief and other equitable
remedies and to limitations of public policy as they may apply to the
indemnification provisions set forth in Section 7.3 of this Agreement.

     4.4  INVESTMENT EXPERIENCE.  The Purchaser acknowledges that it can bear
the economic risk of its investment, including a complete loss of its
investment, and has such knowledge and experience in financial or business
matters that it is capable of evaluating the merits and risks of the investment
in the Shares.  The Purchaser also represents that it has not been organized
solely for the purpose of acquiring the Shares.  The Purchaser understands that
the Shares have not been registered under the Securities Act or under the
securities laws of any jurisdiction by reason of reliance upon certain
exemptions, and that the reliance of the Company on such exemptions is
predicated upon the accuracy of the Purchaser' representations and warranties in
this Section 4.

     4.5  ACCREDITED INVESTOR.  The Purchaser is an "accredited investor" as
defined in Rule 501 of Regulation D under the Securities Act.

     4.6  RESTRICTED SECURITIES; RULE 144.  The Purchaser understands that the
Shares and the Common Shares issuable upon conversion thereof are characterized
as "restricted securities" under the federal securities laws inasmuch as they
are being acquired from the Company in a transaction not involving a public
offering and that under such laws and applicable regulations the Shares may be

                                       -7-

<PAGE>

resold without registration under the Securities Act only in certain limited
circumstances.  The Purchaser acknowledges that the Shares must be held
indefinitely unless subsequently registered under the Securities Act or an
exemption from such registration is available.  The Purchaser is aware of the
provisions of Rule 144 promulgated under the Securities Act which permit limited
resale of shares purchased in a private placement subject to the satisfaction of
certain conditions, including, among other things, the existence of a public
market for the shares, the availability of certain current public information
about the Company, the resale occurring not less than two (2) years after a
party has purchased and paid for the security to be sold, the sale being
effected through a "broker's transaction" or in transactions directly with a
"market maker" (as provided by Rule 144(f)) and the number of shares being sold
during any three (3) month period not exceeding specified limitations.

     4.7  ACCESS TO DATA.  The Purchaser has had an opportunity to discuss the
Company's business, management and financial affairs with the Company's
management and obtain all information regarding the Company which Purchaser has
required in determining to purchase the Shares.

              SECTION 5.  CONDITIONS TO THE PURCHASER'S OBLIGATIONS

     The following conditions to the Purchaser' obligations must be satisfied on
the Closing Date:

     5.1  OPINION OF COUNSEL.  The Purchaser shall have received from Wilson
Sonsini Goodrich & Rosati, counsel for the Company, an opinion that (i) the
Shares purchased by such Purchaser have been duly authorized and upon payment of
the consideration as provided in this Agreement, will be validly issued, fully
paid and nonassessable, (ii) the Agreement has been duly authorized, executed
and delivered by the Company, and (iii) the issuance of the Shares pursuant to
the terms of the Agreement will not be required to be registered under the
Securities Act.

     5.2  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
contained in Section 3 shall be true in all material respects on the Closing
Date with the same effect as though made on and as of that date.

     5.3  COMPLIANCE WITH THIS AGREEMENT.  The Company shall have performed and
complied with all agreements and conditions contained in this Agreement which
are required to be performed or complied with by the Company on or before the
Closing Date.

     5.4  LEGAL INVESTMENT.  On the Closing Date, the purchase of the Shares by
the Purchaser shall be legally permitted by all laws and regulations to which
the Company and the Purchaser are subject.

     5.5  SECURITIES LAW COMPLIANCE.  All actions and steps necessary to assure
compliance with applicable federal and state securities laws, including all
authorizations, approvals or permits, if any, of any governmental authority or
regulatory body in any states where the Shares are being sold

                                       -8-

<PAGE>

that are required in connection with the lawful issuance and sale of the 
Shares pursuant to this Agreement shall have been duly obtained and shall be 
effective on the Closing Date except for any such filings as may under 
applicable law be made subsequent to the Closing Date, which filings the 
Company agrees it will make in a timely manner.

     5.6  CONSENTS.  All material consents, approvals and authorizations, and
all material filings with and notifications of governmental authorities and
regulatory agencies or other entities which regulate the business of the
Company, necessary on the part of the Company to the execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby,
shall have been obtained or effected.

               SECTION 6.  CONDITIONS TO THE COMPANY'S OBLIGATIONS

     The following conditions to the Company's obligations must be satisfied on
the Closing Date:

     6.1  OPINION OF COUNSEL.  The Company shall have received from counsel to
the Purchaser an opinion that the Agreement has been duly authorized, executed
and delivered by the Purchaser.

     6.2  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
contained in Section 4 shall be true in all material respects on the Closing
Date with the same effect as though made on and as of that date.

     6.3  COMPLIANCE WITH THIS AGREEMENT.  The Purchaser shall have performed
and complied with all agreements and conditions contained in the Agreement which
are required to be performed or complied with by the Purchaser on or before the
Closing Date.

     6.4  LEGAL INVESTMENT.  On the Closing Date, the purchase of the Shares by
the Purchaser shall be legally permitted by all laws and regulations to which
the Company and the Purchaser are subject.

     6.5  SECURITIES LAW COMPLIANCE.  All actions and steps necessary to assure
compliance with applicable federal and state securities laws, including all
authorizations, approvals or permits, if any, of any governmental authority or
regulatory body in any states where the Shares are being sold that are required
in connection with the lawful issuance and sale of the Shares pursuant to this
Agreement shall have been duly obtained and shall be effective on the Closing
Date except for any such filings as may under applicable law be made subsequent
to the Closing Date, which filings the Company agrees it will make in a timely
manner.

     6.6  CONSENTS.  All material consents, approvals and authorizations, and
all material filings with and notifications of governmental authorities and
regulatory agencies or other entities which regulate the business of the
Company, necessary on the part of the Company to the execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby,
shall have been obtained or effected.

                                       -9-

<PAGE>

                         SECTION 7. REGISTRATION RIGHTS

     7.1  DEFINITIONS.  For the purpose of this Section 7:

          (a)  the term "Registration Statement" shall mean any registration
statement required to be filed by Section 7.2 below, and shall include any
preliminary prospectus, final prospectus, exhibit or amendment included in or
relating to such registration statement; and

          (b)  the term "untrue statement" shall include any untrue statement 
or alleged untrue statement, or any omission or alleged omission to state in 
the Registration Statement a material fact required to be stated therein or 
necessary to make the statements therein, in the light of the circumstances 
under which they were made, not misleading.

     7.2  REGISTRATION PROCEDURES AND EXPENSES.  The Company shall:

          (a)  promptly upon written notice from Purchaser delivered to the 
Company at any time after ten months from the Closing Date file with the SEC 
a registration statement under the Securities Act on a form which is 
appropriate to register the re-sale of one-half of the Shares purchased by 
Purchaser hereunder;

          (b)  use its best efforts, subject to receipt of necessary 
information from the Purchaser, to cause such Registration Statement to 
become effective as promptly as practicable but not earlier than on the date 
one year from the Closing Date;

          (c)  prepare and file with the SEC such amendments and supplements to
such Registration Statement and the prospectus used in connection therewith as
may be necessary to keep such Registration Statement effective until termination
of such obligation as provided in Section 7.8 below;

          (d)  furnish to the Purchaser with respect to the Shares registered on
the Registration Statement (and to each underwriter, if any, of such Shares)
such number of copies of prospectuses in conformity with the requirements of the
Securities Act as the Purchaser may reasonably request, in order to facilitate
the public sale or other disposition of the Shares by the Purchaser; provided,
however, that the obligation of the Company to deliver copies of prospectuses to
the Purchaser shall be subject to the receipt by the Company of reasonable
assurances from the Purchaser that the Purchaser will comply with the applicable
provisions of the Securities Act and of such other securities laws as may be
applicable in connection with any use of such prospectuses;

          (e)  file such documents as may be required of the Company for normal
securities law clearance for the resale of the Shares in such states of the
United States as may be reasonably requested by the Purchaser; provided,
however, that the Company shall not be required in connection with this
paragraph (e) to qualify as a foreign corporation or execute a general consent
to service of process in any jurisdiction; and

                                      -10-

<PAGE>

          (f)  bear all expenses in connection with the procedures in
paragraphs (a) through (e) of this Section 7.2 and the registration of the
Shares on such Registration Statement and the satisfaction of the blue sky laws
of such states, excluding underwriting discounts and selling commissions, legal
or accounting expenses of Purchaser and expenses required by law to be borne by
Purchaser, all of which shall be borne by Purchaser.

     7.3  INDEMNIFICATION.

          (a)  The Company agrees to indemnify and hold harmless Purchaser (and
each of its officers, directors, partners or persons, if any, who controls
Purchaser within the meaning of Section 15 of the Securities Act) from and
against any losses, claims, damages or liabilities to which Purchaser (and each
of its officers, directors, partners or persons, if any, who controls Purchaser
within the meaning of Section 15 of the Securities Act) may become subject
(under the Securities Act or otherwise) insofar as such losses, claims, damages
or liabilities (or actions or proceedings in respect thereof) arise out of, or
are based upon, any untrue statement or alleged untrue statement of a material
fact contained in the Registration Statement or any omission or alleged omission
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, in each case on the effective date
thereof, or arise out of any failure by the Company to fulfill any undertaking
included in the Registration Statement, and the Company will, as incurred,
reimburse Purchaser (and each of its officers, directors, partners or persons,
if any, who controls Purchaser within the meaning of Section 15 of the
Securities Act) for any legal or other expenses reasonably incurred in
investigating, defending or preparing to defend any such action, proceeding or
claim; provided, however, that the Company shall not be liable in any such case
to the extent that such loss, claim, damage or liability arises out of, or is
based upon, an untrue statement or omission or alleged untrue statement or
omission made in such Registration Statement in reliance upon and in conformity
with written information furnished to the Company by or on behalf of Purchaser
specifically for use in preparation of the Registration Statement.

          (b)  Purchaser agrees to indemnify and hold harmless the Company 
(and each person, if any, who controls the Company within the meaning of 
Section 15 of the Securities Act, each officer of the Company who signs the 
Registration Statement and each director of the Company), from and against 
any losses, claims, damages or liabilities to which the Company (or any such 
officer, director or controlling person) may become subject (under the 
Securities Act or otherwise), insofar as such losses, claims, damages or 
liabilities (or actions or proceedings in respect thereof) arise out of, or 
are based upon, any untrue statement of a material fact contained in the 
Registration Statement or any omission or alleged omission to state therein a 
material fact required to be stated therein or necessary to make the 
statements therein not misleading in each case, on the effective date 
thereof, if such untrue statement was made in reasonable reliance upon and in 
conformity with written information furnished by or on behalf of Purchaser 
specifically for use in preparation of the Registration Statement, and 
Purchaser will, as incurred, reimburse the Company (or such officer, director 
or controlling person) for any legal or other expenses reasonably incurred in 
investigating, defending or preparing to defend any such action, proceeding 
or claim; provided,

                                      -11-

<PAGE>

however, that Purchaser shall in no event be liable for an amount in excess 
of the proceeds actually received by Purchaser upon any sale of Shares by 
Purchaser pursuant to the Registration Statement.

          (c)  Promptly after receipt by any indemnified person of a notice of a
claim or the beginning of any action in respect of which indemnity is to be
sought against an indemnifying person pursuant to this Section 7.3, such
indemnified person shall notify the indemnifying person in writing of such claim
or of the commencement of such action, and, subject to the provisions
hereinafter stated, in case any such action shall be brought against an
indemnified person and such indemnifying person shall have been notified
thereof, such indemnifying person shall be entitled to participate therein, and,
to the extent that it shall wish, to assume the defense thereof, with counsel
reasonably satisfactory to such indemnified person.  After notice from the
indemnifying person to such indemnified person of its election to assume the
defense thereof, such indemnifying person shall not be liable to such
indemnified person for any legal expenses subsequently incurred by such
indemnified person in connection with the defense thereof; provided, however,
that if there exists or shall exist a conflict of interest that would make it
inappropriate in the reasonable judgment of the indemnified person for the same
counsel to represent both the indemnified person and such indemnifying person or
any affiliate or associate thereof, the indemnified person shall be entitled to
retain its own counsel at the expense of such indemnifying person.

          (d)  If the indemnification provided for in this Section 7.3 is
required by its terms but is for any reason held to be unavailable to or
otherwise insufficient to hold harmless an indemnified party in respect of any
losses, claims, damages or liabilities referred to above, then each applicable
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities in
such proportion as is appropriate to reflect the relative fault of the parties
in connection with the statements or failures which resulted in such losses,
claims, damages or liabilities; provided that Purchaser shall not be required to
contribute an amount in excess of the proceeds actually received by the
Purchaser upon any sale of Shares pursuant to the Registration Statement.

     7.4  INFORMATION AVAILABLE.  So long as any registration statement is
effective covering the resale of Shares, the Company will furnish to Purchaser
as soon as practicable after available and upon request of Purchaser, one copy
of (i) its Annual Report to Stockholders (which Annual Report shall contain
financial statements audited in accordance with generally accepted accounting
principles in the United States of America by a national firm of certified
public accountants), (ii) if not included in substance in the Annual Report to
Stockholders, its annual report on Form 10-K, (iii) each of its Quarterly
Reports to Stockholders, and its quarterly report on Form 10-Q, and (iv) a full
copy of the registration statement covering the Shares (the foregoing, in each
case, excluding exhibits).

     7.5  RULE 144 REPORTING.  With a view to making available the benefits of
certain rules and regulations of the SEC which may at any time permit the sale
of the Shares to the public without registration, the Company agrees to use its
best efforts to:

                                      -12-

<PAGE>


          (a)  Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times after
the effective date on which the Company becomes subject to the reporting
requirements of the Securities Act or the Exchange Act; and

          (b)  Use its best efforts to file with the SEC in a timely manner all
reports and other documents required of the Company under the Securities Act and
the Exchange Act.

     7.6  TEMPORARY CESSATION OF OFFERS AND SALES BY PURCHASER.  The Purchaser
acknowledges that there may occasionally be times when the Company may be
required to suspend the use of the prospectus forming part of the Registration
Statement until such time as an amendment to the Registration Statement has been
filed by the Company and declared effective by the Commission, until the
prospectus is supplemented or amended to comply with the Securities Act, or
until such time as the Company has filed an appropriate report with the
Commission pursuant to the Exchange Act.  The Company agrees to file any
necessary amendments, supplements and reports as soon as practicable under the
circumstances.  Purchaser hereby covenants that it will not sell any Shares
pursuant to said prospectus during a period of not more than 60 days commencing
at the time at which the Company gives the Purchaser notice of the suspension of
the use of said prospectus and ending at the time the Company gives the
Purchaser notice that the Purchaser may thereafter effect sales pursuant to said
prospectus, as the same may have been supplemented or amended provided the
Company may not suspend the use of such prospectus until at least 60 days has
elapsed since the previous suspension.

     7.7  TRANSFER OF SHARES AFTER REGISTRATION.  Purchaser hereby covenants
with the Company not to make any sale of the Shares except either (i) in
accordance with the Registration Statement, in which case Purchaser covenants to
comply with the requirement of delivering a current prospectus, or (ii) in
accordance with Rule 144, in which case Purchaser covenants to comply with Rule
144.  Purchaser further acknowledges and agrees that such Shares are not
transferable on the books of the Company unless the certificate submitted to the
Company's transfer agent evidencing such Shares is accompanied by a certificate
executed by an officer of, or other person duly authorized by, Purchaser
certifying to such compliance.

     7.8  TERMINATION OF OBLIGATIONS.  The obligations of the Company pursuant
to Section 7.2 hereof shall cease and terminate upon the earlier to occur of (i)
such time as all of the Shares which have been registered have been resold or
(ii) such time as all of the Shares may be resold in any three-month period
pursuant to Rule 144 under the Securities Act or its successors.  All
obligations of the Company in Section 7 shall cease and terminate upon the
earliest to occur of (i) such time as all of the Shares have been resold or
(ii) such time as all of the Shares may be resold under Rule 144(k) under the
Securities Act or its successor.

                                      -13-

<PAGE>

                            SECTION 8. MISCELLANEOUS

     8.1  NOTICES.  All notices and other communications required or permitted
hereunder shall be in writing and shall be mailed by certified or registered
mail, postage prepaid, delivered either by hand or by messenger, or transmitted
by electronic telecopy (fax) addressed:

               (i)  If to the Company, at:

                         CellNet Data Systems, Inc.
                         Attn:  Paul Manca
                         125 Shoreway Road
                         San Carlos, California 94070
                         Fax:  415/

                    with a copy to:

                         Wilson Sonsini Goodrich & Rosati
                         Attn: Barry E. Taylor, Esq.
                               Trevor J. Chaplick, Esq.
                         650 Page Mill Road
                         Palo Alto, California 94304
                         Fax:  415/493-6811

               (ii) If to Northern States Power Company:

                         Northern States Power Company
                         Attn:  Chief Financial Officer
                         414 Nicollett Mall
                         Minneapolis, Minnesota  55401
                         Tel.: 612/330-7712
                         Fax:  612/330-7558

or at such other address as a party shall have furnished to the other parties in
writing.  All such notices and other written communications shall be effective
(i) if mailed, seven days after mailing, (ii) if delivered, upon delivery, or
(iii) if faxed, one business day after transmission with telephone or fax
confirmation of receipt.

     8.2  SUCCESSORS AND ASSIGNS.  Except as otherwise expressly provided
herein, this Agreement shall inure to the benefit of and be binding upon the
successors, assigns, heirs, executors and administrators of each of the parties
hereto.

     8.3  ENTIRE AGREEMENT; AMENDMENT.  This Agreement and the other documents
delivered pursuant hereto constitute the full and entire understanding and
agreement between the parties with

                                      -14-

<PAGE>

regard to the subjects hereof and thereof. Neither this Agreement nor any 
term hereof may be amended, waived, discharged or terminated other than by a 
written instrument signed by the Company and the Purchaser. Purchaser has no 
obligation to invest in the Company other than the obligations contained in 
this Agreement.

     8.4  COUNTERPARTS. This Agreement may be executed by the several parties on
separate counterparts which, when taken together with counterparts signed by all
the other parties, shall

constitute a single fully executed Agreement which shall be as fully binding and
effective as a counterpart which has been executed by all parties.

     8.5  GOVERNING LAW.  This Agreement shall be deemed a contract made under
the laws of the State of California and together with the rights and obligations
of the parties hereunder, shall be construed under and governed by the laws of
the State of California.

     8.6  SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  All of the
representations and warranties set forth in Sections 3 and 4 shall survive the
execution and delivery of this Agreement and the issuance of the Shares.

     8.7  TERMINATION OR MODIFICATION OF AGREEMENT.

          (a)  Notwithstanding anything contained herein this Agreement shall 
be terminated and cancelled or modified as provided in Section 8.7(b) (i) if 
the Company and the Purchaser do not enter into the PrimeNet License and 
Services Agreement (the "PrimeNet Agreement") on or before November 15, 1996; 
(ii) if the PrimeNet Agreement after being entered into is terminated or 
cancelled for any reason; or (iii) if the  Data Services Agreement is 
terminated or cancelled for any reason.

          (b)  If any of the events in Section 8.7(a) occur, then as of the date
of such event, (i) if Purchaser has not purchased any Shares then all provisions
of this Agreement shall be immediately terminated and cancelled, (ii) if
Purchaser has purchased Shares and the event in Section 8.7(a) occurs prior to
release to Purchaser or the Company of all Escrow Shares under Section 1.2(b),
then all remaining Escrow Shares shall be released to the Company
notwithstanding the Purchaser's future satisfaction of Condition (A) and/or
Condition (B) and the provisions of Section 2.2 of this Agreement shall be
immediately terminated and cancelled, and (iii) if the event in
Section 8.7(a) occurs after release to Purchaser or the Company of all Escrow
Shares under Section 1.2(b), then the provisions of Section 2.2 of this
Agreement shall be immediately terminated and cancelled.  Except as provided in
the preceding sentence, the remaining provisions of this Agreement shall
continue in full force and effect.

                                      -15-

<PAGE>

     IN WITNESS WHEREOF, the Company and the Purchaser have caused this
Agreement to be executed by their duly authorized officers as the date first
above written.


                         CELLNET DATA SYSTEMS, INC.


                         /s/ PAUL MANCA
                         ------------------------------------
                         SIGNATURE


                         /s/ PAUL MANCA, VP & CFO
                         ------------------------------------
                         NAME AND TITLE OF SIGNATORY



                         NORTHERN STATES POWER COMPANY


                         /s/ E. J. MCINTYRE
                         ------------------------------------
                         SIGNATURE


                         E. J. MCINTYRE, VICE PRESIDENT & CFO
                         ------------------------------------
                         NAME AND TITLE OF SIGNATORY



<PAGE>



                            STOCK PURCHASE AGREEMENT

                                  BY AND AMONG

                           CELLNET DATA SYSTEMS, INC.

                                       AND

                     UNION ELECTRIC DEVELOPMENT CORPORATION
                          A WHOLLY OWNED SUBSIDIARY OF
                             UNION ELECTRIC COMPANY



                         DATED AS OF SEPTEMBER 4, 1996




<PAGE>

                            STOCK PURCHASE AGREEMENT

     This Stock Purchase Agreement (this "AGREEMENT") is made as of September
4, 1996, by and among CellNet Data Systems, Inc., a Delaware corporation (the
"COMPANY") and Union Electric Development Corporation (the "PURCHASER"), a
Missouri corporation and a wholly owned subsidiary of Union Electric Company
("PARENT"), a Missouri corporation.

     WHEREAS, the Company has determined that it is in the best interests of the
Company and its stockholders for the Purchaser to make the investment in the
Company provided for, and on the terms and conditions set forth, in this
Agreement; and

     WHEREAS, the Purchaser desires to make such investment on such terms and
conditions.

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and conditions herein contained, the Company and the Purchaser hereby agree as
follows:

                     SECTION 1.  PURCHASE AND SALE OF SHARES

     1.1  AUTHORIZATION OF SHARES.  The Company has authorized the issuance of
shares of its Common Stock, par value $.001 per share (the "SHARES") sufficient
to meet the purposes of Section 1.2.

     1.2  SALE OF THE SHARES.  Subject to the terms and conditions hereof, the
Company will issue and sell to the Purchaser, and the Purchaser will purchase
from the Company, at the Closing, a number of Shares equal to ten million
dollars ($10,000,000) divided by the price at which the Company's Common Stock
will be sold to the public, less the underwriting discount, in the firm
commitment underwriting (the "INITIAL PUBLIC OFFERING") pursuant to a
registration statement filed on August 2, 1996 with the Securities and Exchange
Commission (the "SEC").  The number of Shares shall be rounded to the nearest
whole share as necessary.

     1.3  CLOSING.

          (a)  The purchase and sale of the Shares shall take place at a closing
(the "CLOSING") to be held at the offices of Wilson, Sonsini, Goodrich & Rosati,
650 Page Mill Road, Palo Alto, CA 94304-1050, concurrent with the closing date
of the Company's Initial Public Offering (the "CLOSING DATE").  This Agreement
shall terminate and be of no further force and effect if the closing of the
Initial Public Offering does not occur on or before December 31, 1996.

          (b)  On the Closing Date, subject to the conditions stated herein, the
Company will deliver to the Purchaser stock certificates representing the number
of Shares to be purchased by such Purchaser as provided in Section 1.2 against
payment to the Company by certified check or wire transfer of the purchase price
therefor in federal or other immediately available funds.

<PAGE>


                           SECTION 2.  OTHER AGREEMENTS

     2.1  RESTRICTIONS ON TRANSFER OF COMMON STOCK.

          (a)  The Purchaser shall not, directly or indirectly, sell or 
transfer any Common Stock purchased under this Agreement for a period of two 
years after the Closing Date except as permitted by and in accordance with 
Section 2.1(b)and Section 2.1(c).

          (b)  Notwithstanding Section 2.1(a), one year after the Closing 
Date, Purchaser shall be able to, directly or indirectly, sell or transfer 
one-half of the Common Stock received on the Closing Date subject to 
applicable United States federal and state securities laws.

          (c)  Notwithstanding Section 2.1(a), the Purchaser shall be able to
sell or transfer any Common Stock purchased under this Agreement at any time (i)
to the Company or any person or group approved by the Company (such approval to
be granted or withheld in its sole discretion); or (ii) to a corporation of
which the Purchaser owns not less than 80% of the voting power entitled to be
cast in the election of directors (a "CONTROLLED CORPORATION"), so long as such
Controlled Corporation agrees to hold such Common Stock subject to all the
provisions of this Agreement, and agrees to transfer such Common Stock to the
Purchaser or another Controlled Corporation of the Purchaser if it ceases to be
a Controlled Corporation of the Purchaser; or (iii) in response to (1) an offer
to purchase or exchange for cash or other consideration any Common Stock
(a) which is made by or on behalf of the Company, or (b) which is made by
another person or group and is not opposed by the Board of Directors of the
Company within the time such Board is required, pursuant to regulations under
the Securities Exchange Act of 1934, to advise the Company's stockholders of
such Board's position on such offer, or (2) any other offer made by another
person or group to purchase or exchange for cash or other consideration any
Common Stock which, if successful, would result in such person or group owning
or having the right to acquire Common Stock representing more than 40% of the
total Common Stock of the Company then outstanding; or (iv) pursuant to a bona
fide pledge of such Common Stock to an institutional lender to secure a loan,
guarantee or other financial support, provided that such lender agrees to hold
such Common Stock subject to all provisions of this Agreement and any sale or
disposition by such lender of such pledged Common Stock shall be subject to the
limitations of this Section 2.1; or (v) in the event of a merger or
consolidation in which the holders of Common Stock of the Company prior to the
merger or consolidation cease to hold, directly or indirectly, at least 51% of
the Common Stock of the surviving entity, or (vi) pursuant to a plan of
liquidation of the Company.


            SECTION 3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company hereby represents and warrants to the Purchaser that:

     3.1  ORGANIZATION, GOOD STANDING AND QUALIFICATION.  The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has

                                       -2-

<PAGE>

all requisite power and authority to carry on its business as now conducted and
as proposed to be conducted in the future.  The Company is duly qualified to
transact business and is in good standing in each jurisdiction in which the
failure to so qualify would have a material adverse effect on its business or
properties.

     3.2  AUTHORIZATION.  The Company has all corporate right, power and
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.  All corporate action on the part of the Company, its
officers, directors and stockholders necessary for (i) the authorization,
execution and delivery of this Agreement and the issuance of the Shares and (ii)
the performance of all obligations of the Company hereunder has been taken.
This Agreement has been duly executed and delivered by the Company and
constitutes the valid and legally binding obligation of the Company, enforceable
in accordance with its terms, subject to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws affecting creditors' rights and
remedies generally and rules of law governing specific performance, injunctive
relief and other equitable remedies and to limitations of public policy as they
may apply to the indemnification provisions set forth in Section 7.3 of this
Agreement.  Upon their issuance and delivery pursuant to this Agreement, the
Shares will be validly issued, fully paid and nonassessable and will be free of
any liens or encumbrances; provided, however, that the Shares are subject to
restrictions on transfer under state and/or federal securities laws.  The
issuance and sale of the Shares will not give rise to any preemptive right or
right of first refusal or right of participation on behalf of any person.

     3.3  NO CONFLICT.  The execution and delivery of this Agreement do not, and
the consummation of the transactions contemplated hereby will not, conflict
with, or result in any violation of, or default (with or without notice or lapse
of time, or both), or give rise to a right of termination, cancellation or
acceleration of any obligation or to a loss of a material benefit, under any
provision of the Restated Certificate of Incorporation or Bylaws of the Company
or any material mortgage, indenture, lease or other agreement or instrument,
permit, concession, franchise, license, judgment, order, decree, statute, law,
ordinance, rule or regulation applicable to the Company, its properties or
assets.

     3.4  GOVERNMENTAL CONSENTS.  No consent, approval, order or authorization
of, or registration, qualification, designation, declaration or filing with, any
federal, state, local or provincial governmental authority on the part of the
Company is required in connection with the consummation of the transactions
contemplated by this Agreement, except for any post-sale filings pursuant to
applicable state securities laws, which filings will be effected within the
applicable time periods.  The offer and sale of the Shares pursuant to the terms
of this Agreement are exempt from the registration requirements of Section 5 of
the Securities Act of 1933, as amended (the "SECURITIES ACT").

     3.5  FINAL PROSPECTUS.  The Company's Prospectus for the Initial Public
Offering as filed with the Securities and Exchange Commission pursuant to
Rule 424 shall not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were made, not
misleading.

                                       -3-

<PAGE>

           SECTION 4. REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

     The Purchaser hereby represents and warrants that:

     4.1. PURCHASE OF SECURITIES.  The Purchaser is purchasing the Shares for 
investment for its own account, not as nominee or agent, and not with a view 
to the distribution or resale thereof, subject, nevertheless, to any 
requirement of law that the disposition of its property shall be at all times 
within its control.  The Purchaser will not, in any event, make any sale or 
other disposition of such securities in contravention of the Securities Act 
and the rules and regulations of the Securities and Exchange Commission 
thereunder.

     4.2  LEGENDS.  The Purchaser understands that the certificates 
evidencing the Shares shall bear legends in the following form:

          "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
          ACT OF 1933.  THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR
          HYPOTHECATED IN THE ABSENCE OF A REGISTRATION STATEMENT IN EFFECT
          WITH RESPECT TO THE SECURITIES UNDER SUCH ACT OR AN OPINION OF
          COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
          REQUIRED."

          "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
          CERTAIN RESTRICTIONS ON TRANSFER AS SET FORTH IN THE STOCK
          PURCHASE AGREEMENT BETWEEN THE ISSUER AND THE ORIGINAL HOLDER OF
          THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
          OFFICE OF THE ISSUER.  SUCH TRANSFER RESTRICTIONS ARE BINDING ON
          TRANSFEREES OF THESE SHARES."

     4.3  AUTHORIZATION.  The Purchaser has all corporate right, power and
authority to enter into this Agreement and to consummate the transactions
contemplated hereby.  All corporate action on the part of the Purchaser, its
officers, directors and stockholders necessary for (i) the authorization,
execution and delivery of this Agreement and (ii) the performance of all
obligations of the Purchaser hereunder has been taken.  This Agreement has been
duly executed and delivered by the Purchaser and constitutes the valid and
legally binding obligation of the Purchaser, enforceable in accordance with its
terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium
and similar laws affecting creditors' rights and remedies generally and rules of
law governing specific performance, injunctive relief and other equitable
remedies and to limitations of public policy as they may apply to the
indemnification provisions set forth in Section 7.3 of this Agreement.

     4.4  INVESTMENT EXPERIENCE.  The Purchaser acknowledges that it can bear
the economic risk of its investment, including a complete loss of its
investment, and has such knowledge and

                                       -4-

<PAGE>

experience in financial or business matters that it is capable of evaluating the
merits and risks of the investment in the Shares.  The Purchaser also represents
that it has not been organized solely for the purpose of acquiring the Shares.
The Purchaser understands that the Shares have not been registered under the
Securities Act or under the securities laws of any jurisdiction by reason of
reliance upon certain exemptions, and that the reliance of the Company on such
exemptions is predicated upon the accuracy of the Purchaser' representations and
warranties in this Section 4.

     4.5  ACCREDITED INVESTOR.  The Parent of the Purchaser is an "accredited
investor" as defined in Rule 501 of Regulation D under the Securities Act and
Purchaser is a wholly owned subsidiary of Parent.

     4.6  RESTRICTED SECURITIES; RULE 144.  The Purchaser understands that the
Shares and the Common Shares issuable upon conversion thereof are characterized
as "restricted securities" under the federal securities laws inasmuch as they
are being acquired from the Company in a transaction not involving a public
offering and that under such laws and applicable regulations the Shares may be
resold without registration under the Securities Act only in certain limited
circumstances.  The Purchaser acknowledges that the Shares must be held
indefinitely unless subsequently registered under the Securities Act or an
exemption from such registration is available.  The Purchaser is aware of the
provisions of Rule 144 promulgated under the Securities Act which permit limited
resale of shares purchased in a private placement subject to the satisfaction of
certain conditions, including, among other things, the existence of a public
market for the shares, the availability of certain current public information
about the Company, the resale occurring not less than two (2) years after a
party has purchased and paid for the security to be sold, the sale being
effected through a "broker's transaction" or in transactions directly with a
"market maker" (as provided by Rule 144(f)) and the number of shares being sold
during any three (3) month period not exceeding specified limitations.

     4.7  ACCESS TO DATA.  The Purchaser has had an opportunity to discuss the
Company's business, management and financial affairs with the Company's
management and obtain all information regarding the Company which Purchaser has
required in determining to purchase the Shares.

              SECTION 5. CONDITIONS TO THE PURCHASER'S OBLIGATIONS

     The following conditions to the Purchaser's obligations must be 
satisfied on the Closing Date:

     5.1  OPINION OF COUNSEL.  The Purchaser shall have received from Wilson
Sonsini Goodrich & Rosati, counsel for the Company, an opinion that (i) the
Shares purchased by such Purchaser have been duly authorized and upon payment of
the consideration as provided in this Agreement, will be validly issued, fully
paid and nonassessable, (ii) the Agreement has been duly authorized, executed
and delivered by the Company, and (iii) the issuance of the Shares pursuant to
the terms of the Agreement will not be required to be registered under the
Securities Act.

                                       -5-

<PAGE>

     5.2  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
contained in Section 3 shall be true in all material respects on the Closing
Date with the same effect as though made on and as of that date.

     5.3  COMPLIANCE WITH THIS AGREEMENT.  The Company shall have performed and
complied with all agreements and conditions contained in this Agreement which
are required to be performed or complied with by the Company on or before the
Closing Date.

     5.4  LEGAL INVESTMENT.  On the Closing Date, the purchase of the Shares by
the Purchaser shall be legally permitted by all laws and regulations to which
the Company and the Purchaser are subject.

     5.5  SECURITIES LAW COMPLIANCE.  All actions and steps necessary to assure
compliance with applicable federal and state securities laws, including all
authorizations, approvals or permits, if any, of any governmental authority or
regulatory body in any states where the Shares are being sold that are required
in connection with the lawful issuance and sale of the Shares pursuant to this
Agreement shall have been duly obtained and shall be effective on the Closing
Date except for any such filings as may under applicable law be made subsequent
to the Closing Date, which filings the Company agrees it will make in a timely
manner.

     5.6  CONSENTS.  All material consents, approvals and authorizations, and
all material filings with and notifications of governmental authorities and
regulatory agencies or other entities which regulate the business of the
Company, necessary on the part of the Company to the execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby,
shall have been obtained or effected.

               SECTION 6.  CONDITIONS TO THE COMPANY'S OBLIGATIONS

     The following conditions to the Company's obligations must be satisfied on
the Closing Date:

     6.1  OPINION OF COUNSEL.  The Company shall have received from counsel to
the Purchaser an opinion that the Agreement has been duly authorized, executed
and delivered by the Purchaser.

     6.2  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
contained in Section 4 shall be true in all material respects on the Closing
Date with the same effect as though made on and as of that date.

     6.3  COMPLIANCE WITH THIS AGREEMENT.  The Purchaser shall have performed
and complied with all agreements and conditions contained in the Agreement which
are required to be performed or complied with by the Purchaser on or before the
Closing Date.

                                       -6-

<PAGE>

     6.4  LEGAL INVESTMENT.  On the Closing Date, the purchase of the Shares by
the Purchaser shall be legally permitted by all laws and regulations to which
the Company and the Purchaser are subject.

     6.5  SECURITIES LAW COMPLIANCE.  All actions and steps necessary to assure
compliance with applicable federal and state securities laws, including all
authorizations, approvals or permits, if any, of any governmental authority or
regulatory body in any states where the Shares are being sold that are required
in connection with the lawful issuance and sale of the Shares pursuant to this
Agreement shall have been duly obtained and shall be effective on the Closing
Date except for any such filings as may under applicable law be made subsequent
to the Closing Date, which filings the Company agrees it will make in a timely
manner.

     6.6 CONSENTS.  All material consents, approvals and authorizations, and all
material filings with and notifications of governmental authorities and
regulatory agencies or other entities which regulate the business of the
Company, necessary on the part of the Company to the execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby,
shall have been obtained or effected.

                         SECTION 7.  REGISTRATION RIGHTS

     7.1  DEFINITIONS.  For the purpose of this Section 7:

          (a)  the term "Registration Statement" shall mean any registration
statement required to be filed by Section 7.2 below, and shall include any
preliminary prospectus, final prospectus, exhibit or amendment included in or
relating to such registration statement; and

          (b)  the term "untrue statement" shall include any untrue statement or
alleged untrue statement, or any omission or alleged omission to state in the
Registration Statement a material fact required to be stated therein or
necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading.

     7.2  REGISTRATION PROCEDURES AND EXPENSES.  The Company shall:

          (a)  promptly upon written notice from Purchaser delivered to the
Company at any time after ten months from the Closing Date, file with
the SEC a registration statement (the "REGISTRATION STATEMENT")  under the
Securities Act on a form which is appropriate to register the re-sale of one-
half of the Shares purchased by Purchaser hereunder;

          (b)  use its best efforts, subject to receipt of necessary information
from the Purchaser, to cause such Registration Statement to become effective as
promptly as practicable but not earlier than on the date one year from the 
Closing Date;

                                       -7-

<PAGE>

          (c)  prepare and file with the SEC such amendments and supplements to
such Registration Statement and the prospectus used in connection therewith as
may be necessary to keep such Registration Statement effective until termination
of such obligation as provided in Section 7.8 below;

          (d)  furnish to the Purchaser with respect to the Shares registered on
the Registration Statement (and to each underwriter, if any, of such Shares)
such number of copies of prospectuses in conformity with the requirements of the
Securities Act as the Purchaser may reasonably request, in order to facilitate
the public sale or other disposition of the Shares by the Purchaser; provided,
however, that the obligation of the Company to deliver copies of prospectuses to
the Purchaser shall be subject to the receipt by the Company of reasonable
assurances from the Purchaser that the Purchaser will comply with the applicable
provisions of the Securities Act and of such other securities laws as may be
applicable in connection with any use of such prospectuses;

          (e)  file such documents as may be required of the Company for normal
securities law clearance for the resale of the Shares in such states of the
United States as may be reasonably requested by the Purchaser; provided,
however, that the Company shall not be required in connection with this
paragraph (e) to qualify as a foreign corporation or execute a general consent
to service of process in any jurisdiction; and

          (f)  bear all expenses in connection with the procedures in
paragraphs (a) through (e) of this Section 7.2 and the registration of the
Shares on such Registration Statement and the satisfaction of the blue sky laws
of such states, excluding underwriting discounts and selling commissions, legal
or accounting expenses of Purchaser and expenses required by law to be borne by
Purchaser, all of which shall be borne by Purchaser.

     7.3  INDEMNIFICATION.

          (a)  The Company agrees to indemnify and hold harmless Purchaser (and
each of its officers, directors, partners or persons, if any, who controls
Purchaser within the meaning of Section 15 of the Securities Act) from and
against any losses, claims, damages or liabilities to which Purchaser (and each
of its officers, directors, partners or persons, if any, who controls Purchaser
within the meaning of Section 15 of the Securities Act) may become subject
(under the Securities Act or otherwise) insofar as such losses, claims, damages
or liabilities (or actions or proceedings in respect thereof) arise out of, or
are based upon, any untrue statement or alleged untrue statement of a material
fact contained in the Registration Statement or any omission or alleged omission
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, in each case on the effective date
thereof, or arise out of any failure by the Company to fulfill any undertaking
included in the Registration Statement, and the Company will, as incurred,
reimburse Purchaser (and each of its officers, directors, partners or persons,
if any, who controls Purchaser within the meaning of Section 15 of the
Securities Act) for any legal or other expenses reasonably incurred in
investigating, defending or preparing to defend any such action, proceeding or
claim; provided, however, that the Company shall not be liable in any such case
to the extent that

                                       -8-

<PAGE>

such loss, claim, damage or liability arises out of, or is based upon, an untrue
statement or omission or alleged untrue statement or omission made in such
Registration Statement in reliance upon and in conformity with written
information furnished to the Company by or on behalf of Purchaser specifically
for use in preparation of the Registration Statement.

          (b)  Purchaser agrees to indemnify and hold harmless the Company (and
each person, if any, who controls the Company within the meaning of Section 15
of the Securities Act, each officer of the Company who signs the Registration
Statement and each director of the Company), from and against any losses,
claims, damages or liabilities to which the Company (or any such officer,
director or controlling person) may become subject (under the Securities Act or
otherwise), insofar as such losses, claims, damages or liabilities (or actions
or proceedings in respect thereof) arise out of, or are based upon, any untrue
statement of a material fact contained in the Registration Statement or any
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading in
each case, on the effective date thereof, if such untrue statement was made in
reliance upon and in conformity with written information furnished by or on
behalf of Purchaser specifically for use in preparation of the Registration
Statement, and Purchaser will, as incurred, reimburse the Company (or such
officer, director or controlling person) for any legal or other expenses
reasonably incurred in investigating, defending or preparing to defend any such
action, proceeding or claim; provided, however, that Purchaser shall in no event
be liable for an amount in excess of the proceeds actually received by Purchaser
upon any sale of Shares pursuant to the Registration Statement.

          (c)  Promptly after receipt by any indemnified person of a notice of a
claim or the beginning of any action in respect of which indemnity is to be
sought against an indemnifying person pursuant to this Section 7.3, such
indemnified person shall notify the indemnifying person in writing of such claim
or of the commencement of such action, and, subject to the provisions
hereinafter stated, in case any such action shall be brought against an
indemnified person and such indemnifying person shall have been notified
thereof, such indemnifying person shall be entitled to participate therein, and,
to the extent that it shall wish, to assume the defense thereof, with counsel
reasonably satisfactory to such indemnified person.  After notice from the
indemnifying person to such indemnified person of its election to assume the
defense thereof, such indemnifying person shall not be liable to such
indemnified person for any legal expenses subsequently incurred by such
indemnified person in connection with the defense thereof; provided, however,
that if there exists or shall exist a conflict of interest that would make it
inappropriate in the reasonable judgment of the indemnified person for the same
counsel to represent both the indemnified person and such indemnifying person or
any affiliate or associate thereof, the indemnified person shall be entitled to
retain its own counsel at the expense of such indemnifying person.

          (d)  If the indemnification provided for in this Section 7.3 is
required by its terms but is for any reason held to be unavailable to or
otherwise insufficient to hold harmless an indemnified party in respect of any
losses, claims, damages or liabilities referred to above, then each applicable
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities in
such proportion as is appropriate to reflect

                                       -9-

<PAGE>


the relative fault of the parties in connection with the statements or failures
which resulted in such losses, claims, damages or liabilities; provided that
Purchaser shall not be required to contribute an amount in excess of the
proceeds actually received by the Purchaser upon any sale of Shares pursuant to
the Registration Statement.

     7.4  INFORMATION AVAILABLE.  So long as any registration statement is
effective covering the resale of Shares, the Company will furnish to Purchaser
as soon as practicable after available, one copy of (i) its Annual Report to
Stockholders (which Annual Report shall contain financial statements audited in
accordance with generally accepted accounting principles in the United States of
America by a national firm of certified public accountants), (ii) if not
included in substance in the Annual Report to Stockholders, its annual report on
Form 10-K, (iii) each of its Quarterly Reports to Stockholders, and its
quarterly report on Form 10-Q, and (iv) a full copy of the registration
statement covering the Shares (the foregoing, in each case, excluding exhibits).

     7.5  RULE 144 REPORTING.  With a view to making available the benefits of
certain rules and regulations of the SEC which may at any time permit the sale
of the Shares to the public without registration, the Company agrees to use its
best efforts to:

          (a)  Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times after
the effective date on which the Company becomes subject to the reporting
requirements of the Securities Act or the Exchange Act; and

          (b)  Use its best efforts to file with the SEC in a timely manner all
reports and other documents required of the Company under the Securities Act and
the Exchange Act.

     7.6  TEMPORARY CESSATION OF OFFERS AND SALES BY PURCHASER.  The Purchaser
acknowledges that there may occasionally be times when the Company may be
required to suspend the use of the prospectus forming part of the Registration
Statement until such time as an amendment to the Registration Statement has been
filed by the Company and declared effective by the Commission, until the
prospectus is supplemented or amended to comply with the Securities Act, or
until such time as the Company has filed an appropriate report with the
Commission pursuant to the Exchange Act.  The Company agrees to file any
necessary amendments, supplements and reports as soon as practicable under the
circumstances.  Purchaser hereby covenants that it will not sell any Shares
pursuant to said prospectus during a period of not more than 60 days commencing
at the time at which the Company gives the Purchaser notice of the suspension of
the use of said prospectus and ending at the time the Company gives the
Purchaser notice that the Purchaser may thereafter effect sales pursuant to said
prospectus, as the same may have been supplemented or amended provided the
Company may not suspend the use of such prospectus until at least 60 days has
elapsed since the previous suspension.

     7.7  TRANSFER OF SHARES AFTER REGISTRATION.  Purchaser hereby covenants
with the Company not to make any sale of the Shares except either (i) in
accordance with the Registration

                                      -10-

<PAGE>

Statement, in which case Purchaser covenants to comply with the requirement of
delivering a current prospectus, or (ii) in accordance with Rule 144, in which
case Purchaser covenants to comply with Rule 144.  Purchaser further
acknowledges and agrees that such Shares are not transferable on the books of
the Company unless the certificate submitted to the Company's transfer agent
evidencing such Shares is accompanied by a certificate executed by an officer
of, or other person duly authorized by, Purchaser certifying to such compliance.

     7.8  TERMINATION OF OBLIGATIONS.  The obligations of the Company pursuant
to Section 7.2 hereof shall cease and terminate upon the earlier to occur of (i)
such time as all of the Shares which have been registered have been resold or
(ii) such time as all of the Shares may be resold in any three-month period
pursuant to Rule 144 under the Securities Act or its successors.  All
obligations of the Company in Section 7 shall cease and terminate upon the
earliest to occur of (i) such time as all of the Shares have been resold or
(ii) such time as all of the Shares may be resold under Rule 144(k) under the
Securities Act or its successor.

                            SECTION 8. MISCELLANEOUS

     8.1  NOTICES.  All notices and other communications required or permitted
hereunder shall be in writing and shall be mailed by certified or registered
mail, postage prepaid, delivered either by hand or by messenger, or transmitted
by electronic telecopy (fax) addressed:

               (i)  If to the Company, at:

                         CellNet Data Systems, Inc.
                         Attn:  Paul Manca
                         125 Shoreway Road
                         San Carlos, CA 94070
                         Fax:  415/508-6000

                    with a copy to:

                         Wilson Sonsini Goodrich & Rosati
                         Attn: Barry E. Taylor, Esq.
                               Trevor J. Chaplick, Esq.
                         650 Page Mill Road
                         Palo Alto, CA 94304
                         Fax:  415/493-6811

                                      -11-

<PAGE>

               (ii) If to Union Electric Development Corporation:

                         Union Electric Development Corporation
                         Attn:  Mr. Donald E. Brandt
                         1901 Chouteau Avenue
                         St. Louis, Missouri 63103
                         Tel.: 314/554-2473
                         Fax:  314/554-3066

or at such other address as a party shall have furnished to the other parties in
writing.  All such notices and other written communications shall be effective
(i) if mailed, seven days after mailing, (ii) if delivered, upon delivery, or
(iii) if faxed, one business day after transmission with telephone or fax
confirmation of receipt.

     8.2  SUCCESSORS AND ASSIGNS.  Except as otherwise expressly provided
herein, this Agreement shall inure to the benefit of and be binding upon the
successors, assigns, heirs, executors and administrators of each of the parties
hereto.

     8.3  ENTIRE AGREEMENT; AMENDMENT.  This Agreement and the other documents
delivered pursuant hereto constitute the full and entire understanding and
agreement between the parties with regard to the subjects hereof and thereof.
Neither this Agreement nor any term hereof may be amended, waived, discharged or
terminated other than by a written instrument signed by the Company and the
Purchaser.

     8.4  COUNTERPARTS. This Agreement may be executed by the several parties on
separate counterparts which, when taken together with counterparts signed by all
the other parties, shall constitute a single fully executed Agreement which
shall be as fully binding and effective as a counterpart which has been executed
by all parties.

     8.5  GOVERNING LAW.  This Agreement shall be deemed a contract made under
the laws of the State of California and together with the rights and obligations
of the parties hereunder, shall be construed under and governed by the laws of
the State of California.

     8.6  SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  All of the
representations and warranties set forth in Sections 3 and 4 shall survive the
execution and delivery of this Agreement and the issuance of the Shares.

                                      -12-

<PAGE>

     IN WITNESS WHEREOF, the Company and the Purchaser have caused this 
Agreement to be executed by their duly authorized officers as of the date 
first above written.

                         CELLNET DATA SYSTEMS, INC.



                         /s/ PAUL MANCA
                         -----------------------------------------------
                         SIGNATURE


                         PAUL MANCA, VP & CFO
                         -----------------------------------------------
                         NAME AND TITLE OF SIGNATORY



                         UNION ELECTRIC DEVELOPMENT CORPORATION


                         /s/ DONALD E. BRANDT
                         -----------------------------------------------
                         SIGNATURE


                         DONALD E. BRANDT, VICE PRESIDENT AND CONTROLLER
                         -----------------------------------------------
                         NAME AND TITLE OF SIGNATORY


<PAGE>

                                                                   EXHIBIT 5.1




                   [WILSON SONSINI GOODRICH & ROSATI LETTERHEAD]




                               September 9, 1996

CellNet Data Systems, Inc.
125 Shoreway Road
San Carlos, CA 94070

     RE:  REGISTRATION STATEMENT ON FORM S-1

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-1 to be filed by 
you with the Securities and Exchange Commission on or about September 9, 1996 
(as such may thereafter be amended or supplemented, the "Registration 
Statement"), in connection with the registration under the Securities Act of 
1933, as amended, of up to 5,750,000 shares of your Common Stock, $.001 
par value (the "Shares").  We understand that the Shares are to be sold to 
the underwriters of the offering for resale to the public as described in the 
Registration Statement.  As your legal counsel, we have examined the 
proceedings taken, and are familiar with the proceedings proposed to be 
taken, by you in connection with the sale and issuance of the Shares.

     It is our opinion that, upon completion of the proceedings being taken 
or contemplated by us, as your counsel, to be taken prior to the issuance of 
the Shares, including the proceedings being taken in order to permit such 
transaction to be carried out in accordance with applicable state securities 
laws, the Shares, when issued and sold in the manner described in the 
Registration Statement and in accordance with the resolutions adopted by the 
Board of Directors of CellNet Data Systems, Inc., will be legally and validly 
issued, fully paid and nonassessable.

     We consent to the use of this opinion as an exhibit to the Registration 
Statement and further consent to the use of our name wherever appearing in 
the Registration Statement, including the Prospectus constituting a part 
thereof, and any amendments thereto.

                                      Very truly yours,

                                      WILSON SONSINI GOODRICH & ROSATI
                                      Professional Corporation
                                      /s/ WILSON SONSINI GOODRICH & ROSATI


<PAGE>
                                                                    EXHIBIT 11.1
 
                           CELLNET DATA SYSTEMS, INC.
 
                  COMPUTATION OF PRO FORMA NET LOSS PER SHARE
 
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
   
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS ENDED
                                                                               YEAR ENDED   ----------------------
                                                                              DECEMBER 31,   JUNE 30,    JUNE 30,
                                                                                  1995         1995        1996
                                                                              ------------  ----------  ----------
 
<S>                                                                           <C>           <C>         <C>
Net loss....................................................................   $  (40,956)  $  (12,121) $  (32,313)
                                                                              ------------  ----------  ----------
                                                                              ------------  ----------  ----------
Weighted average common shares outstanding..................................        4,115        3,435       5,101
Convertible preferred stock (using the "if converted method")...............       24,706       24,706      24,706
Warrants (using the "if converted method")..................................        3,950        3,950       3,950
Common Stock options included pursuant to the Securities and Exchange
 Commission's Staff Accounting Bulletin No. 83..............................          726          726         726
                                                                              ------------  ----------  ----------
Shares used in computing pro forma net loss per share.......................       33,497       32,817      34,483
                                                                              ------------  ----------  ----------
                                                                              ------------  ----------  ----------
Pro forma net loss per share................................................   $    (1.22)  $    (0.37) $    (0.94)
                                                                              ------------  ----------  ----------
                                                                              ------------  ----------  ----------
</TABLE>
    

<PAGE>
                                                                    EXHIBIT 23.1
 
              INDEPENDENT AUDITORS' CONSENT AND REPORT ON SCHEDULE
 
   
    We  consent  to  the use  in  this  Registration Statement  of  CellNet Data
Systems, Inc. on Form S-1 of our  report dated February 9, 1996 (April 11,  1996
as  to the last sentence of the second paragraph of Note 5 and September 5, 1996
as to Note 10), appearing in the Prospectus, which is part of this  Registration
Statement  and  to the  reference  to us  under  the heading  "Experts"  in such
Prospectus.
    
 
    Our audits  of the  consolidated  financial statements  referred to  in  our
aforementioned   report  also  included  the  consolidated  financial  statement
schedule of CellNet  Data Systems,  Inc., listed  in Item  16(b). The  financial
statement  schedule  is  the  responsibility of  the  Company's  management. Our
responsibility is to  express an opinion  based on our  audits. In our  opinion,
such  consolidated financial statement schedule,  when considered in relation to
the basic consolidated financial statements taken as a whole, presents fairly in
all material respects the information set forth therein.
 
   
DELOITTE & TOUCHE LLP
San Jose, California
September 5, 1996
    

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
consolidated balance sheets and consolidated statements of operations
found on pages F-3 and F-4 of the Company's Registration Statement on Form
S-1 and is qualified in its entirety by reference to such consolidated
financial statements.
</LEGEND>
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996
<PERIOD-END>                               DEC-31-1995             JUN-30-1996
<CASH>                                           48018                   70730
<SECURITIES>                                     95779                   32237
<RECEIVABLES>                                     2118                    1904
<ALLOWANCES>                                      (25)                    (25)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                     0                       0
<PP&E>                                            7539                    9129
<DEPRECIATION>                                  (3561)                  (5590)
<TOTAL-ASSETS>                                  184306                  162653
<CURRENT-LIABILITIES>                                0                       0
<BONDS>                                              0                       0
                          (29486)                 (29486)
                                    (27195)                 (27196)
<COMMON>                                       (27608)                 (27636)
<OTHER-SE>                                      (2118)                  (2118)
<TOTAL-LIABILITY-AND-EQUITY>                  (184306)                (162653)
<SALES>                                           1663                     127
<TOTAL-REVENUES>                                  2126                     420
<CGS>                                           (1294)                   (109)
<TOTAL-COSTS>                                   (5129)                  (3483)
<OTHER-EXPENSES>                               (33386)                 (21345)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                              (4564)                  (7903)
<INCOME-PRETAX>                                (40953)                 (32311)
<INCOME-TAX>                                       (3)                     (2)
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (40956)                 (32313)
<EPS-PRIMARY>                                   (1.22)                  (0.94)
<EPS-DILUTED>                                        0                       0
        


</TABLE>


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