AETHER SYSTEMS INC
424B4, 1999-10-21
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>   1
                                                      Pursuant to Rule 424(b)(4)
                                                      File no. 333-85697


PROSPECTUS
- ----------------

                                6,000,000 SHARES

                                 [AETHER LOGO]

                                  COMMON STOCK

                            ------------------------

        This is Aether Systems, Inc.'s initial public offering of common stock.

        Prior to the offering, there has been no public market for the shares.
The common stock will trade on the Nasdaq National Market under the symbol
"AETH."

        INVESTING IN THE COMMON STOCK INVOLVES RISKS WHICH ARE DESCRIBED IN THE
"RISK FACTORS" SECTION BEGINNING ON PAGE 8 OF THIS PROSPECTUS.

                            ------------------------

<TABLE>
<CAPTION>
                                                        PER SHARE       TOTAL
                                                        ---------       -----
<S>                                                     <C>          <C>
Public offering price................................    $16.00      $96,000,000

Underwriting discount................................     $1.12       $6,697,600

Proceeds, before expenses, to Aether Systems, Inc....    $14.88      $89,302,400
</TABLE>

        The underwriters may also purchase up to an additional 900,000 shares at
the public offering price, less the underwriting discount, within 30 days from
the date of this prospectus to cover over allotments.

        Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                            ------------------------

MERRILL LYNCH & CO.
                ROBERTSON STEPHENS
                                DONALDSON, LUFKIN & JENRETTE
                                            U.S. BANCORP PIPER JAFFRAY

                            ------------------------

                The date of this prospectus is October 20, 1999.
<PAGE>   2

     DESCRIPTION OF INSIDE FRONT COVER: The inside front cover contains the
Aether Systems logo and the slogan: "Real Intelligence. Real Time." Below the
logo and slogan are photographs depicting three key aspects of our business:
wireless enterprise services, Aether Intelligent Messaging and OpenSky.

     DESCRIPTION OF INSIDE GATEFOLD: At the top of the two-panel foldout is the
following text: "How We Do It. . . Wireless data is complex. We handle every
aspect of extending our customers' application to a variety of wireless networks
and handheld devices."

     Graphics description: Below the text is a graphic depicting our business,
roughly portraying the flow of information from our customers' data sources,
through our software and network and customer support center, to various
wireless data networks and finally to various wireless handheld devices. From
left to right, this depiction shows:

- - Icons, with brief text labels, representing the three major business segments
  Aether is targeting: Financial services (with the caption "Financial: Trading,
  Quotes, News & Alerts"), other industries (with the caption "Other Target
  Industries: Health Care, Transportation, Sales Force Automation") and OpenSky
  (with the caption "OpenSky Opportunities: Developing Smart Web and E-mail
  Access").

- - Each of the above icons connects to a box with the Aether logo. Beneath the
  logo will be three separate boxes, each labelled for a different component of
  our offerings: "Software Development and Engineering;" "Secure, Reliable
  Network Operations Center" and "Complete Customer Support."

- - From the Aether box, there is a set of lines that runs to a box with the
  Aether Intelligent Messaging logo, out of which there are lines pointing
  further to the right which connect to icons of radio antennas, depicting the
  various wireless data networks through which Aether delivers its services.
  These antennas carry the text: "Today's Networks" and "Tomorrow's Networks."

- - From the antenna icons, curved lines depict radio waves radiating out to
  photographs of the various wireless handheld devices through which Aether
  delivers services. These devices include: A generic laptop computer of no
  particular brand; a Palm Computing device, a Windows CE notebook computer, a
  RIM 950 alphanumeric two-way pager and a wireless phone that is compatible
  with the Wireless Applications Protocol. The following text labels accompany
  the photographs: "Laptop computers," "Palm Computing devices," "Windows CE
  devices," "Text enhanced pagers," "WAP phones."
<PAGE>   3

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                                ----
<S>                                                           <C>
Prospectus Summary..........................................      4
Risk Factors................................................      8
Forward Looking Statements..................................     16
Use of Proceeds.............................................     17
Dividend Policy.............................................     17
Capitalization..............................................     18
Dilution....................................................     19
Selected Consolidated Financial Data........................     20
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................     22
Business....................................................     30
Management..................................................     44
Transactions Between Aether and its Officers, Directors or
  Significant Stockholders..................................     55
Principal Stockholders......................................     59
Description of Capital Stock................................     62
Shares Eligible for Future Sale.............................     65
Underwriting................................................     67
Legal Matters...............................................     70
Experts.....................................................     70
Where You Can Find More Information.........................     70
Index to Consolidated Financial Statements..................    F-1
</TABLE>

                                        3
<PAGE>   4

                               PROSPECTUS SUMMARY

     This summary does not contain all the information that may be important to
you. You should read the entire prospectus carefully, including the financial
data and related notes beginning on page F-1, before making an investment
decision.

                                  OUR COMPANY

     We provide wireless data services and systems enabling people to use
wireless handheld devices for real-time data communications and transactions. We
offer a broad range of capabilities necessary to design, develop, sell and
support a full range of wireless data services. We can offer these capabilities
because of our engineering expertise, our wireless integration software and our
customer service and network operations center.

     Our initial focus is on the financial services industry, including online
trading. We currently offer the Reuters MarketClip service for financial market
price quotes, alerts and information and TradeRunner, a real-time wireless
trading and financial information service offered to the online customers of
Discover Brokerage. We are developing similar services for other major financial
institutions, including Charles Schwab. We recently acquired Mobeo, Inc., a
provider of wireless foreign exchange information services, for a purchase price
of $11.7 million in cash and options to acquire shares of our common stock. The
Mobeo acquisition adds new services that complement our own, establishes our
relationship with additional financial institutions and significantly increases
our subscriber base. We are also targeting other industries, initially by
licensing our package of wireless messaging software and software development
tools known as Aether Intelligent Messaging, or AIM. Finally, we hold a 26%
interest in OpenSky, a company we recently formed with 3Com Corporation, which
will pursue the broader consumer and business mass market for wireless Internet
access, e-mail and Internet and other electronic transactions.

     The market for wireless data applications is relatively undeveloped and has
been hindered by significant technological challenges, including incompatible
devices and networks, slow data speeds and uncertain security. We believe these
complexities have given us the opportunity to establish a position as an early
market leader in wireless data services.

     We have all the resources necessary to provide our customers with complete
wireless data systems. We have a large, experienced development team, with 27
engineers who have worked an average of ten years in the wireless data field. We
have developed the AIM package of wireless messaging software and software
development tools, which serves as a bridge to integrate diverse corporate
in-house data systems with a wide variety of wireless carrier networks and end
user devices. We operate our own high-security network operations center, which
connects customer and other data to wireless networks, and maintain our own
customer service center. We have also cultivated close relationships with major
wireless network carriers, including AT&T Wireless Services, Bell Atlantic
Mobile and BellSouth Wireless Data and mobile equipment manufacturers, such as
3Com, Ericsson LM and Novatel Wireless, Inc.

     Our strategy.  Our strategy is to be the dominant provider of wireless data
services and systems by using our engineering expertise, our AIM package of
wireless messaging software and software development tools, our customer service
and network operations center and our other resources to offer businesses
complete systems for wireless data communications and transactions. We seek to
maximize recurring revenue initially by extending online trading and financial
information services to personal organizers, notebook computers, pagers and
mobile phones. Our strategy includes the key elements set forth below.

     - Develop the market for existing and new products in the financial
       services sector.

     - Expand into new industries and international markets.

     - Pursue mass-market opportunities, including wireless Internet access,
       e-mail and Internet and other electronic transactions.

     - Expand our customer base and strengthen the Aether brand through enhanced
       sales and marketing efforts.

     - Maintain and strengthen our strategic relationships with suppliers and
       customers.

                                        4
<PAGE>   5

     - Use the expertise we gain by providing engineering services to develop
       new Aether products.

     - Pursue selective acquisitions to expand our capabilities.

     Our services.  We develop and support systems for businesses that allow
their employees or customers to access information and conduct transactions
using wireless handheld devices. Our services currently include delivering real-
time wireless financial market information and trading capabilities to
individual investors and financial market professionals. We also license the AIM
package of wireless messaging software and development tools to software
manufacturers and other corporations seeking to add wireless data capabilities
and provide engineering services to businesses seeking to design, develop and
support wireless data systems.

     Operating results.  We had revenue of $1.4 million in 1996, $1.8 million in
1997, $1.5 million in 1998 and $787,000 in the first six months of 1999. We had
net losses of $417,000 in 1996, $2.7 million in 1997, $4.7 million in 1998 and
$4.3 million in the first six months of 1999. As of June 30, 1999, we had
cumulative losses of $12.2 million. On a pro forma basis, giving effect to the
Mobeo acquisition, we had revenue of $10.1 million in 1998 and $5.8 million in
the first six months of 1999, and we had net losses of $6.8 million in 1998 and
$5.2 million in the first six months of 1999.

     Other information.  Aether is presently organized as a Delaware limited
liability company known as Aether Systems LLC. Prior to the closing of this
offering, each member of the limited liability company will contribute its units
in the limited liability company to Aether Systems, Inc., a newly-formed
Delaware corporation, in exchange for two and one-half shares of our common
stock. Following this contribution, this limited liability company will merge
into Aether. Unless otherwise indicated, all information in this prospectus
gives effect to our conversion from a limited liability company to a corporation
through this contribution and merger. All references to "we," "us," "our" or
"Aether" in this prospectus mean Aether Systems, Inc. and its subsidiaries or
Aether Systems LLC and its subsidiaries if the reference is as of a time before
completion of the conversion.

     Our principal executive offices are located at 11460 Cronridge Drive,
Owings Mills, Maryland 21117, and our telephone number is (410) 654-6400. We
maintain a Web site at www.aethersystems.com. Information contained in our Web
site does not constitute a part of this prospectus.

                                        5
<PAGE>   6

                                  THE OFFERING

<TABLE>
<S>                                                 <C>
Common stock offered by us........................  6,000,000 shares
Total common stock to be outstanding after the
  offering........................................  26,066,995 shares. We also will have outstanding
                                                    after the offering options and warrants to
                                                    purchase 4,901,520 shares of our common stock.
Use of proceeds...................................  We intend to use approximately $14.8 million of
                                                    net proceeds to repay in full all indebtedness
                                                    incurred under our senior secured interim credit
                                                    facility with Merrill Lynch & Co., one of the
                                                    underwriters of this offering, of which $11.7
                                                    million was used to purchase Mobeo, approximately
                                                    $0.8 million was used to pay fees and expenses
                                                    related to the credit facility and the remaining
                                                    $2.3 million was allocated for general corporate
                                                    purposes. In addition, we intend to use
                                                    approximately $2.5 million of the net proceeds to
                                                    exercise a warrant to increase our ownership in
                                                    OpenSky from 26% to up to 33% on a fully diluted
                                                    basis and approximately $2.0 million to expand our
                                                    network operations center over the next 12 months.
                                                    We currently intend to use the remaining net
                                                    proceeds from the offering for general corporate
                                                    purposes, which may include some or all of the
                                                    following:
                                                    - enhance our sales and marketing activities;
                                                    - fund cash flow deficits and working capital
                                                    needs;
                                                    - enhance Mobeo service offerings;
                                                    - fund potential future acquisitions; and
                                                    - maintain our interest in OpenSky.
Risk factors......................................  See "Risk Factors" beginning at page 8 for a
                                                    discussion of factors you should consider
                                                    carefully before deciding to invest in shares of
                                                    our common stock.
Nasdaq National Market symbol.....................  AETH
</TABLE>

                                        6
<PAGE>   7

                      SUMMARY CONSOLIDATED FINANCIAL DATA
                (in thousands, except share and per share data)

     The following table summarizes our statements of operations for each of the
years ended December 31, 1996, 1997 and 1998 and for the six-month periods ended
June 30, 1998 and 1999, and our balance sheet as of June 30, 1999. The pro forma
consolidated financial information gives effect to the Mobeo acquisition. The
pro forma net loss per share information gives effect to our conversion from a
limited liability company to a corporation plus the offering of shares covered
by this prospectus and the application of the net proceeds as described in "Use
of Proceeds" at page 17. The pro forma consolidated as adjusted balance sheet
information gives effect to the Mobeo acquisition and our conversion to a
corporation plus the offering of shares covered by this prospectus and the
application of the net proceeds as described in "Use of Proceeds" at page 17.

     We have provided the pro forma consolidated financial information and the
pro forma consolidated as adjusted balance sheet for informational purposes only
and you should not assume that our results would actually have been as shown if
we had acquired Mobeo, converted to a corporation or completed the offering on
the assumed dates, or that the information projects what our results will be as
a result of the Mobeo acquisition or if we convert to a corporation or complete
the offering. The pro forma consolidated statement of operations information
assumes that the transactions occurred on January 1, 1998, and the pro forma
consolidated balance sheet information assumes that the transactions occurred on
June 30, 1999. See our and Mobeo's financial statements and notes to those
statements included in this prospectus beginning on page F-1.

<TABLE>
<CAPTION>
                                               YEAR ENDED DECEMBER 31,                          SIX MONTHS ENDED JUNE 30,
                                ------------------------------------------------------   ----------------------------------------
                                              HISTORICAL                      1998              HISTORICAL               1999
                                ---------------------------------------    PRO FORMA     -------------------------    PRO FORMA
                                   1996          1997          1998       CONSOLIDATED      1998          1999       CONSOLIDATED
                                -----------   -----------   -----------   ------------   -----------   -----------   ------------
<S>                             <C>           <C>           <C>           <C>            <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenue:
 Subscriber revenue...........  $        --   $       161   $       549   $     9,130    $       125   $       599   $     5,646
 Engineering services
   revenue....................        1,355         1,625           963           963            436           188           188
                                -----------   -----------   -----------   -----------    -----------   -----------   -----------
 Total revenue................        1,355         1,786         1,512        10,093            561           787         5,834
Gross profit..................          348           493           411         5,951            190           136         3,426
Total operating expenses......          601         2,801         5,178        13,398          2,316         4,597         8,963
                                -----------   -----------   -----------   -----------    -----------   -----------   -----------
Operating loss................         (253)       (2,308)       (4,767)       (7,447)        (2,126)       (4,461)       (5,537)
                                -----------   -----------   -----------   -----------    -----------   -----------   -----------
Net loss......................  $      (417)  $    (2,747)  $    (4,693)  $    (6,843)   $    (2,119)  $    (4,320)  $    (5,161)
                                ===========   ===========   ===========   ===========    ===========   ===========   ===========
Pro forma net loss per
 share-basic and diluted......  $     (0.04)  $     (0.22)  $     (0.29)  $     (0.31)   $     (0.15)  $     (0.22)  $     (0.20)
                                ===========   ===========   ===========   ===========    ===========   ===========   ===========
Pro forma weighted average
 shares used in computing net
 loss per share-basic and
 diluted......................   10,554,795    12,655,901    15,916,383    21,916,383     14,270,568    19,877,855    25,877,855
                                ===========   ===========   ===========   ===========    ===========   ===========   ===========
</TABLE>

<TABLE>
<CAPTION>
                                                                        AS OF JUNE 30, 1999
                                                              ---------------------------------------
                                                                                          PRO FORMA
                                                                          PRO FORMA      CONSOLIDATED
                                                              ACTUAL   CONSOLIDATED(1)   AS ADJUSTED
                                                              ------   ---------------   ------------
<S>                                                           <C>      <C>               <C>
BALANCE SHEET DATA:
 Cash and cash equivalents..................................  $ 457       $  3,159         $76,331
 Working capital (deficit)..................................  3,674        (10,199)         77,803
 Total assets...............................................  5,867         25,756          98,098
 Total debt(1)..............................................     --         14,830              --
 Members' capital...........................................  4,841          5,215              --
 Stockholders' equity.......................................     --             --          92,387
</TABLE>

- ---------------

(1) We financed the acquisition of Mobeo with a senior secured interim credit
    facility, which will be repaid with the net proceeds of the offering.

                                        7
<PAGE>   8

                                  RISK FACTORS

     Investing in our common stock involves risks.  You should carefully
consider the following risks together with the other information contained in
this prospectus before deciding to buy our common stock.

OUR FUTURE RESULTS ARE UNCERTAIN BECAUSE OUR HISTORICAL REVENUE WAS DERIVED FROM
SERVICES OTHER THAN THOSE WE EXPECT TO BE THE FOCUS OF OUR BUSINESS IN THE
FUTURE.

     We only have a limited history selling our current services on which you
can evaluate our business, financial condition and operating results. Although
we commenced operations in January 1996, until March 1997 all of our revenue
came from engineering services and not from monthly service subscriptions or AIM
licensing which we now provide and which will be our focus in the future. In
1997, 91.0% of our revenue was from engineering services and 9.0% was from
subscriber revenue. In 1998, 63.7% of our revenue was from engineering services
(or 9.5% on a pro forma basis including Mobeo) and 36.3% was from subscriber
revenue (or 90.5% on a pro forma basis including Mobeo). In the first six months
of 1999, 23.9% of our revenue was from engineering services (or 3.2% on a pro
forma basis including Mobeo) and 76.1% was from subscriber revenue (or 96.8% on
a pro forma basis including Mobeo). In addition, Transettlements and Reuters
accounted for 61.4% of our engineering services revenue in 1998. We have not had
any AIM licensing revenue through June 1999. Because of this change in focus,
you should not rely on our past performance to evaluate our future performance.

WE HAVE HISTORICALLY INCURRED LOSSES AND THESE LOSSES MAY INCREASE IN THE
FUTURE.

     We reported net losses of $416,980, $2.7 million and $4.7 million for the
years ended December 31, 1996, 1997 and 1998, respectively, and a net loss of
$4.3 million for the six months ended June 30, 1999. Because we expect to
continue to incur significant sales and marketing, systems development and
administrative expenses, we will need to generate significant revenue to become
profitable and sustain profitability on a quarterly or annual basis. We may not
achieve or sustain our revenue or profit goals and our losses may continue or
grow in the future. As a result, we may not be able to increase revenue or
achieve profitability on a quarterly or annual basis.

THERE IS NO ESTABLISHED MARKET FOR OUR FINANCIAL DATA AND OTHER SERVICES AND WE
MAY NOT BE ABLE TO SELL ENOUGH OF OUR SERVICES TO BECOME PROFITABLE.

     The markets for wireless data services and online trading are still
emerging and continued growth in demand for and acceptance of these services
remains uncertain. Current barriers to market acceptance of these services
include cost, reliability, functionality and ease of use. We cannot be certain
that these barriers will be overcome. We are currently developing financial
trading services for Charles Schwab and Bear Stearns pursuant to preliminary
agreements with these parties and we cannot assure you that Charles Schwab or
Bear Stearns will enter into contracts for our services. Our competitors may
develop alternative wireless data communications systems that gain broader
market acceptance than our systems. If the market for our services does not grow
or grows more slowly than we currently anticipate, we may not be able to attract
customers for our services and our revenues would be adversely affected.

OUR ACQUISITION OF MOBEO, OUR ONLY ACQUISITION TO DATE, MAY NOT DELIVER THE
VALUE WE PAID FOR IT AND MAY RESULT IN EXCESSIVE EXPENSES IF WE DO NOT
SUCCESSFULLY INTEGRATE MOBEO OR IF THE COSTS AND MANAGEMENT RESOURCES WE EXPEND
IN CONNECTION WITH THE INTEGRATION EXCEED OUR EXPECTATIONS.

     Our acquisition of Mobeo is our only acquisition to date. Mobeo's revenue
was $8.6 million for the year ended December 31, 1998, which is more than five
times our revenue for that period. We expect that the Mobeo acquisition will
have a continuing, significant impact on our business, financial condition and
operating results. The value of Mobeo may be less than the amount we paid for it
if there is:

     - a decline of Mobeo's position in the foreign exchange information
       services market; or

     - a decline of the foreign exchange information services market in general.

                                        8
<PAGE>   9

     The expenses associated with acquiring Mobeo (or any other business we may
acquire) may be greater, and the revenue may be smaller, than expected if:

     - we fail to assimilate the acquired assets with our pre-existing business;

     - we lose key employees of Mobeo or Aether as a result of the acquisition;

     - we are unable to operate effectively in the market for foreign exchange
       and commodities information;

     - our management's attention is diverted from other business concerns; or

     - we assume unanticipated liabilities related to the acquired assets.

     Further, we cannot guarantee that we will realize the benefits or strategic
objectives we are seeking to obtain by acquiring Mobeo.

WE MAY NOT ACHIEVE PROFITABILITY IF WE ARE UNABLE TO MAINTAIN, IMPROVE AND
DEVELOP THE WIRELESS DATA SERVICES WE OFFER.

     We believe that our future business prospects depend in part on our ability
to maintain and improve our current services and to develop new ones on a timely
basis. Our services will have to achieve market acceptance, maintain
technological competitiveness and meet an expanding range of customer
requirements. As a result of the complexities inherent in our service offerings,
major new wireless data services and service enhancements require long
development and testing periods. We may experience difficulties that could delay
or prevent the successful development, introduction or marketing of new services
and service enhancements. Additionally, our new services and service
enhancements may not achieve market acceptance. If we cannot effectively
maintain, improve and develop services we may not be able to recover our fixed
costs or otherwise become profitable.

IF WE DO NOT RESPOND EFFECTIVELY AND ON A TIMELY BASIS TO RAPID TECHNOLOGICAL
CHANGE, OUR SERVICES MAY BECOME OBSOLETE AND WE MAY LOSE SALES.

     The wireless and data communications industries are characterized by
rapidly changing technologies, industry standards, customer needs and
competition, as well as by frequent new product and service introductions. Our
services are integrated with wireless handheld devices and the computer systems
of our corporate customers. Our services must also be compatible with the data
networks of wireless carriers. We must respond to technological changes
affecting both our customers and suppliers. We may not be successful in
developing and marketing, on a timely and cost-effective basis, new services
that respond to technological changes, evolving industry standards or changing
customer requirements. Our ability to grow and achieve profitability will
depend, in part, on our ability to accomplish all of the following in a timely
and cost-effective manner:

     - effectively use and integrate new wireless and data technologies;

     - continue to develop our technical expertise;

     - enhance our wireless data, engineering and system design services;

     - develop applications for new wireless networks; and

     - influence and respond to emerging industry standards and other changes.

WE DEPEND UPON WIRELESS NETWORKS OWNED AND CONTROLLED BY OTHERS. IF WE DO NOT
HAVE CONTINUED ACCESS TO SUFFICIENT CAPACITY ON RELIABLE NETWORKS, WE MAY BE
UNABLE TO DELIVER SERVICES AND OUR SALES COULD DECREASE.

     Our ability to grow and achieve profitability partly depends on our ability
to buy sufficient capacity on the networks of wireless carriers such as AT&T
Wireless Services or Bell Atlantic Mobile and on the reliability and security of
their systems. All of our services are delivered using airtime purchased from
third parties. We depend on these companies to provide uninterrupted and "bug
free" service and would not be able to satisfy our customers' needs if they
failed to provide the required capacity or needed level of service. In addition,
our expenses would increase and our profitability could be materially adversely
affected if wireless carriers were to increase the prices of their services. Our
existing agreements with the wireless carriers generally have one-year terms.
Some of these

                                        9
<PAGE>   10

wireless carriers are, or could become, our competitors and if they compete with
us they may decline to provide us with their services.

WE DEPEND ON THIRD PARTIES, PARTICULARLY DISCOVER BROKERAGE, FOR THE MARKETING
AND SALES OF SOME OF OUR SERVICES. IF THE MARKETING EFFORTS OF THESE THIRD
PARTIES ARE NOT EFFECTIVE, WE MAY NOT ACHIEVE A PROFITABLE LEVEL OF SALES.

     We rely substantially on the efforts of others to market and sell some of
our wireless data communications services, including wireless trading with
Discover Brokerage. In 1998, third parties paid over $150,000 in marketing
expenses related to our products, which represented 18% of our own sales and
marketing expenses. We cannot control how those who sell and market our service
perform and we cannot be certain that their performance will be satisfactory. If
these third parties fail to market our services or their efforts fail to result
in new customers, we may be unable to attract new customers and our revenue
could be adversely effected.

OUR FAILURE TO DEVELOP RECOGNITION FOR THE AETHER BRAND COULD PREVENT US FROM
ACHIEVING A PROFITABLE LEVEL OF SALES.

     Our sales and marketing activities to date have been limited. Our sales and
marketing expenses were $840,455 for the year ended December 31, 1998 and
$555,428 for the six months ended June 30, 1999. We intend to increase the
market presence of our brand over time, which will require us to increase the
amount we spend on sales and marketing. We have applied for, but have not
received, federal trademark registrations for the names "Aether," "Aether
Systems" or "AIM" and we may not be able to use these names effectively or at
all if we fail to obtain such registrations due to conflicting marks or
otherwise. As a result of the Mobeo acquisition, we expect to market Mobeo's
products under their existing brands. We may lose existing customers or fail to
attract new customers if the Aether and Mobeo brands are not well received by
our customers, if our marketing efforts are not productive, if we are otherwise
unsuccessful in increasing our brand awareness or if our competition has greater
brand recognition.

WE MAY FAIL TO SUPPORT OUR ANTICIPATED GROWTH IN OPERATIONS WHICH COULD REDUCE
DEMAND FOR OUR SERVICES AND MATERIALLY ADVERSELY AFFECT OUR REVENUE.

     Our business strategy is based on the assumption that the number of
subscribers to our services, the amount of information they want to receive and
the number of services we offer will all increase. We must continue to develop
and expand our systems and operations to accommodate this growth. The expansion
and adaptation of our customer service and network operations center requires
substantial financial, operational and management resources. We may be unable to
expand our operations for one or more of the following reasons:

     - we may not be able to locate or hire at reasonable compensation rates
       qualified engineers and other employees necessary to expand our capacity;

     - we may not be able to obtain the hardware necessary to expand our
       capacity;

     - we may not be able to expand our customer service, billing and other
       related support systems; and

     - we may not be able to obtain sufficient additional capacity from wireless
       carriers.

     Due to the limited deployment of our services to date, the ability of our
systems and operations to connect and manage a substantially larger number of
customers while maintaining superior performance is unknown. Any failure on our
part to develop and maintain our wireless data services as we experience rapid
growth could significantly reduce demand for our services and materially
adversely affect our revenue.

WE DEPEND ON RECRUITING AND RETAINING KEY MANAGEMENT AND TECHNICAL PERSONNEL
WITH WIRELESS DATA AND SOFTWARE EXPERIENCE AND WE MAY NOT BE ABLE TO DEVELOP NEW
PRODUCTS OR SUPPORT EXISTING PRODUCTS IF WE CANNOT HIRE OR RETAIN QUALIFIED
EMPLOYEES.

     Because of the technical nature of our products and the dynamic market in
which we compete, our performance depends on attracting and retaining key
employees. Competition for qualified personnel in the wireless data and software
industries is intense and finding qualified personnel with experience in both
industries is even more difficult. We believe there are only a limited number of
individuals with the requisite skills in the field of wireless data
communication, and it is becoming increasingly difficult to hire and retain
these persons. Competitors and others have

                                       10
<PAGE>   11

in the past attempted, and may in the future attempt, to recruit our employees.
Each of our 27 engineers has entered into a non-compete agreement with us for a
period of ten months after they leave Aether. These agreements will not prevent
our engineers from leaving or working for competitors relatively soon after they
leave us.

     We currently maintain a key person life insurance policy for David S. Oros,
our chairman, chief executive officer and president. We do not maintain
insurance policies for any of our 82 other employees.

WE MAY NOT HAVE ADEQUATELY PROTECTED OUR INTELLECTUAL PROPERTY RIGHTS, WHICH
COULD ALLOW COMPETITORS TO DEVELOP SIMILAR PRODUCTS USING SIMILAR TECHNOLOGY AND
THUS REDUCE OUR SALES AND REVENUE.

     We currently do not have patents on any of our intellectual property, and
we cannot assure you we will be successful in protecting any of our intellectual
property through patent law. We rely primarily on trade secret laws, copyright
law and confidentiality agreements to protect our intellectual property. If we
are not adequately protected, other companies with sufficient engineering
expertise could quickly develop competing products based on our intellectual
property and reduce our sales and thus our revenue.

WE MAY BE SUED BY THIRD PARTIES FOR INFRINGEMENT OF THEIR INTELLECTUAL PROPERTY
RIGHTS AND INCUR COSTS OF DEFENSE AND POSSIBLY ROYALTIES OR LOSE THE RIGHT TO
USE TECHNOLOGY IMPORTANT TO PROVIDING OUR SERVICES.

     The telecommunications and software industries are characterized by the
existence of a large number of patents and frequent litigation based on
allegations of patent infringement or other violations of intellectual property
rights. As the number of participants in our market increases, the possibility
of an intellectual property claim against us could increase. Mobeo has received
at least one claim that it has infringed patents developed by other parties. Any
intellectual property claims, with or without merit, could be time-consuming and
expensive to litigate or settle, could require us to enter into costly royalty
arrangements and could divert management attention from administering our
business.

WE MAY BE SUBJECT TO LIABILITY FOR TRANSMITTING INFORMATION, AND OUR INSURANCE
COVERAGE MAY BE INADEQUATE TO PROTECT US FROM THIS LIABILITY.

     We may be subject to claims relating to information transmitted over
systems we develop or operate. These claims could take the form of lawsuits for
defamation, negligence, copyright or trademark infringement or other actions
based on the nature and content of the materials. Although we carry general
liability insurance, our insurance may not cover potential claims of this type
or may not be adequate to cover all costs incurred in defense of potential
claims or to indemnify us for all liability that may be imposed.

DISRUPTION OF OUR SERVICES DUE TO ACCIDENTAL OR INTENTIONAL SECURITY BREACHES
MAY HARM OUR REPUTATION CAUSING A LOSS OF SALES AND COULD INCREASE OUR EXPENSES.

     A significant barrier to the growth of wireless data services or
transactions on the Internet or by other electronic means has been the need for
secure transmission of confidential information. Our systems could be disrupted
by unauthorized access, computer viruses and other accidental or intentional
actions. We may incur significant costs to protect against the threat of
security breaches or to alleviate problems caused by such breaches. If a
third-party were able to misappropriate our users' personal or proprietary
information or credit card information, we could be subject to claims,
litigation or other potential liabilities that could materially adversely impact
our revenue and may result in the loss of customers.

ANY TYPE OF SYSTEMS FAILURE COULD REDUCE SALES, OR INCREASE COSTS OR RESULT IN
CLAIMS OF LIABILITY.

     Our existing wireless data services-TradeRunner, Reuters MarketClip and its
predecessor AirBroker and the Mobeo services-are dependent on real-time,
continuous feeds from Reuters Selectfeed Plus and others. The ability of our
subscribers to make securities trades through Discover Brokerage requires timely
and uninterrupted connections with our wireless network carriers. Any disruption
from our satellite feeds or backup landline feeds could result in delays in our
subscribers' ability to receive information or execute trades. There can be no
assurance that our systems will operate appropriately if we experience a
hardware or software failure or if there is an earthquake, fire or other natural
disaster, a power or telecommunications failure, an act of God or an act of war.
A failure in our systems could
                                       11
<PAGE>   12

cause delays in transmitting data, and as a result we may lose customers or face
litigation that could involve material costs and distract management from
operating our business.

OUR ABILITY TO SELL NEW AND EXISTING SERVICES AT A PROFIT COULD BE IMPAIRED BY
COMPETITORS.

     Intense competition could develop in the market for services we offer. We
developed our software using standard industry development tools. Many of our
agreements with wireless carriers, wireless handheld device manufacturers and
data providers are non-exclusive. Our competitors may use the same products and
services in competition with us. With time and capital, it would be possible for
competitors to replicate our services. Our competitors could include wireless
network carriers such as AT&T Wireless Services and Bell Atlantic Mobile,
software developers such as Microsoft Corporation and Phone.com and systems
integrators such as International Business Machines Corporation. Many of our
competitors have significantly greater resources than we do. Furthermore,
competitors may develop a different approach to marketing the services we
provide in which subscribers may not be required to pay for the information
provided by our services. Competition could reduce our market share or force us
to lower prices to unprofitable levels. Additional information regarding our
competition is described under "Business -- Competition" at page 41.

WE MAY LOSE THE OPPORTUNITY TO PURSUE DESIRABLE PROJECTS TO OPENSKY.

     David S. Oros, our chairman, chief executive officer and president, also
serves as a director of OpenSky and Janice M. Roberts, one of our nominees for
director, is a director of OpenSky. OpenSky is a separate business in which we
have an equity interest that is developing applications for wireless access to
the Internet and related applications such as wireless e-mail access. Mr. Oros
and Ms. Roberts may learn of business opportunities that are appropriate for
both OpenSky and us, and Mr. Oros and Ms. Roberts may not be required to make
those opportunities available to us. If OpenSky pursues opportunities that we
would have an interest in pursuing, our business may fail to grow or our
existing business may suffer. Mr. Oros and Ms. Roberts may also have other
conflicts of interest with Aether because of their positions with OpenSky and
OpenSky's contractual relationships with Aether and 3Com. We describe those
contracts in "Transactions between Aether and its Officers, Directors or
Significant Stockholders -- OpenSky" at page 57.

AN INTERRUPTION IN THE SUPPLY OF PRODUCTS AND SERVICES THAT WE OBTAIN FROM THIRD
PARTIES COULD CAUSE A DECLINE IN SALES OF OUR SERVICES.

     In designing, developing and supporting our wireless data services, we rely
on wireless carriers, wireless handheld device manufacturers, content providers
and software providers. These suppliers may experience difficulty in supplying
us products or services sufficient to meet our needs or they may terminate or
fail to renew contracts for supplying us these products or services on terms we
find acceptable. Any significant interruption in the supply of any of these
products or services could cause a decline in sales of our services unless and
until we are able to replace the functionality provided by these products and
services. Specifically, Novatel Wireless, Inc. and Sierra Wireless Inc. are our
only suppliers of wireless modems, which are an integral hardware component to
our services. It can be difficult to obtain these wireless modems and their
parts. We also depend on third parties to deliver and support reliable products,
enhance their current products, develop new products on a timely and
cost-effective basis and respond to emerging industry standards and other
technological changes. In addition, we rely on the ability of our content
providers-Reuters, Bridge Information Systems America, the New York Stock
Exchange, Inc., the Chicago Board of Trade, the Nasdaq Stock Market, Inc. and
the Options Price Reporting Authority-to continue to provide us with
uninterrupted access to the news and financial information we provide to our
customers. The failure of third parties to meet these criteria, or their refusal
or failure to deliver the information for whatever reason, could materially harm
our business.

OUR SALES CYCLE IS LONG, AND OUR STOCK PRICE COULD DECLINE IF SALES ARE DELAYED
OR CANCELLED.

     Quarterly fluctuations in our operating performance are exacerbated by the
length of time between our first contact with a business customer and the first
revenue from sales of services to that customer or end user. Because our
services represent a significant investment for our business customers, we spend
a substantial amount of time educating them regarding the use and benefits of
our services and they, in turn, spend a substantial amount of time
                                       12
<PAGE>   13

performing internal reviews and obtaining capital expenditure approvals before
purchasing our services. As much as a year may elapse between the time we
approach a business customer and the time we begin to deliver services to a
customer or end user. Any delay in sales of our services could cause our
quarterly operating results to vary significantly from projected results, which
could cause our stock price to decline. In addition, we may spend a significant
amount of time and money on a potential customer that ultimately does not
purchase our services.

OUR SALES OF FINANCIAL DATA AND TRADING SERVICES COULD GO DOWN IF THERE IS A
DECLINE IN SECURITIES TRADING.

     In the six months ended June 30, 1999, we earned 76.1% (or 96.8% on a pro
forma basis giving effect to the Mobeo acquisition) of our revenue from services
that provide financial information and wireless trading capability. If there is
a prolonged decline in the overall level of securities trading, or online
trading in particular, our operating results may decline. A decline in
securities trading may result from:

     - loss of confidence in the reliability or security of online trading
       systems;

     - government regulation of the securities industry or online trading; or

     - a downturn in the stock market.

OUR SOFTWARE MAY CONTAIN DEFECTS OR ERRORS, AND OUR SALES COULD GO DOWN IF THIS
INJURES OUR REPUTATION OR DELAYS SHIPMENTS OF OUR SOFTWARE.

     The AIM package of wireless messaging and software development tools we
develop is complex and must meet the stringent technical requirements of our
customers. We must develop our services quickly to keep pace with the rapidly
changing software and telecommunications markets. Software as complex as ours is
likely to contain undetected errors or defects, especially when first introduced
or when new versions are released. Our software may not be free from errors or
defects after delivery to customers have begun, which could result in the
rejection of our software or services, damage to our reputation, lost revenue,
diverted development resources and increased service and warranty costs.

OUR YEAR 2000 COMPLIANCE EFFORTS MAY INVOLVE SIGNIFICANT TIME AND EXPENSE, AND
UNCORRECTED PROBLEMS COULD HARM OUR BUSINESS.

     Many currently installed computer systems are not capable of distinguishing
21st century dates from 20th century dates. As a result, beginning on January 1,
2000, computer systems and software used by many companies in a wide variety of
industries, including technology, transportation, utilities, finance and
telecommunications will produce erroneous results or fail unless they have been
modified or upgraded to process date information correctly. Although our expense
of preparing for possible year 2000 problems has been less than $100,000 to
date, future year 2000 compliance efforts could involve significant time and
expense, and uncorrected problems could result in material costs or loss of
revenue. We may face claims based on year 2000 issues arising from the
integration of multiple products, including ours, within an overall system. Our
customers may also cease or delay purchase and installation of new complex
systems, such as our software products, as a result of, and during, their own
internal year 2000 testing. Similarly, our wireless network carriers and
suppliers could face similar year 2000 problems which could result in a
disruption in our ability to provide services.

THE STOCKHOLDER AGREEMENT AMONG OUR MAJOR STOCKHOLDERS WILL HAVE THE EFFECT OF
ALLOWING THEM TO CONTROL EIGHT OF OUR TEN DIRECTORS, WHICH WILL LIMIT THE
ABILITY OF NEW INVESTORS TO INFLUENCE CONTROL OF AETHER.

     We expect NexGen Technologies, L.L.C., Telcom-ATI Investors, L.L.C.,
Reuters MarketClip Holdings Sarl, a subsidiary of Reuters Group plc, and 3Com
Corporation-who will together hold 66% of the shares of common stock outstanding
after the offering-to enter into a stockholder agreement that will govern voting
for our directors. The agreement will provide that each party will vote all of
its shares for two directors nominated by NexGen, two directors nominated by
Telcom-ATI Investors, two directors nominated jointly by NexGen and Telcom-ATI
Investors and one director nominated by each of Reuters and 3Com. As a result,
eight directors of our board will effectively be chosen by these major
stockholders. As we currently have authorized only ten directors, the voting
rights of our stockholders other than these major stockholders will effectively
apply to only two of our directors. In addition to its effect on the

                                       13
<PAGE>   14

voting rights of our new investors, the stockholder agreement could have the
effect of delaying or preventing a change in control.

WE MAY NEED ADDITIONAL CAPITAL AND WE MAY NOT BE ABLE TO OBTAIN IT, WHICH COULD
PREVENT US FROM CARRYING OUT OUR BUSINESS STRATEGY.

     We currently anticipate that our available cash resources combined with the
net proceeds from this offering will be sufficient to fund our operating needs
for at least the next 12 months, including the expansion of our sales and
marketing program and any acquisitions we may pursue in the next 12 months.
Thereafter, we expect to require additional financing in an amount that we
cannot determine at this time. After the offering, we do not have any bank
credit facility or other working capital credit line under which we may borrow
funds for working capital or other general corporate purposes. If our plans or
assumptions change or are inaccurate, we may be required to seek capital sooner
than anticipated. We may need to raise funds through public or private debt or
equity financings.

     If funds are raised through the issuance of equity securities, the
percentage ownership of our then-current stockholders may be reduced and the
holders of new equity securities may have rights, preferences or privileges
senior to those of the holders of our common stock. If additional funds are
raised through a bank credit facility or the issuance of debt securities, the
holder of this indebtedness would have rights senior to the rights of the
holders of our common stock and the terms of this indebtedness could impose
restrictions on our operations. If we need to raise additional funds, we may not
be able to do so on terms favorable to us, or at all. If we cannot raise
adequate funds on acceptable terms, we may not be able to continue to fund our
operations.

NEW LAWS AND REGULATIONS THAT IMPACT OUR INDUSTRY COULD INCREASE OUR COSTS OR
REDUCE OUR OPPORTUNITIES TO EARN REVENUE.

     We are not currently subject to direct regulation by the Federal
Communications Commission or any other governmental agency, other than
regulations applicable to businesses in general. However, in the future, we may
become subject to regulation by the FCC or another regulatory agency. In
addition, the wireless carriers who supply us airtime are subject to regulation
by the FCC and regulations that affect them could increase our costs or reduce
our ability to continue selling and supporting our services.

OUR STOCK PRICE, LIKE THAT OF MANY TECHNOLOGY COMPANIES, MAY BE VOLATILE.

     We expect that the market price of our common stock will be volatile. We
are involved in a highly visible, rapidly changing industry and stock prices in
our and similar industries have risen and fallen in response to a variety of
factors, including:

     - announcements of new wireless data communications technologies and new
       providers of wireless data communications;

     - acquisitions of or strategic alliances among providers of wireless data
       communications;

     - changes in recommendations by securities analysts regarding the results
       or prospects of providers of wireless data communications; and

     - changes in investor perceptions of the acceptance or profitability of
       wireless data communications.

WE HAVE ANTI-TAKEOVER DEFENSES THAT COULD DELAY OR PREVENT AN ACQUISITION AND
COULD ADVERSELY AFFECT THE PRICE OF OUR COMMON STOCK.

     Provisions of our certificate of incorporation and bylaws and provisions of
Delaware law could delay, defer or prevent an acquisition or change of control
of Aether or otherwise adversely affect the price of our common stock. For
example, our bylaws limit the ability of stockholders to call a special meeting.
Our certificate of incorporation also permits our board to issue shares of
preferred stock without stockholder approval which means that the board could
issue shares with special voting rights or other provisions that could deter a
takeover. In addition to delaying or preventing an acquisition, the issuance of
a substantial number of preferred shares could adversely affect the price of the
common stock. Please refer to "Description of Capital Stock" at page 62 for a
more detailed discussion of these provisions.

                                       14
<PAGE>   15

UPON COMPLETION OF THIS OFFERING, YOU WILL EXPERIENCE DILUTION.

     Our tangible assets are readily identified assets like property, equipment,
cash, securities and accounts receivable. The value of these assets on our pro
forma balance sheet minus the value of our liabilities equals $2.96 per share,
giving effect to the Mobeo acquisition and the completion of this offering. The
offering price exceeds this amount by $13.04 per share. Therefore, you will be
paying more for a share of stock than the value reflected in our accounts of
tangible assets for that share. If we were forced to sell all our assets and
distribute all the proceeds, you would not recover the amount you paid for
shares unless we can sell the assets for more than the value we report for our
tangible assets. We also have outstanding a large number of stock options and
warrants to purchase common stock with exercise prices significantly below the
price of shares in this offering. You will experience further dilution to the
extent these options or warrants are exercised.

WE EXPECT ABOUT 19,499,495 SHARES OF COMMON STOCK TO BECOME AVAILABLE FOR SALE
180 DAYS FROM THE DATE OF THIS PROSPECTUS, AND SALES OF THESE SHARES MAY DEPRESS
OUR SHARE PRICE.

     After this offering, we will have outstanding 26,066,995 shares of common
stock. Sales of a substantial number of our shares of common stock in the public
market following this offering-or the expectation of such sales-could cause the
market price of our common stock to drop. All the shares sold in this offering
will be freely tradable. The remaining common shares outstanding after this
offering will be available for sale in the public markets as follows:

<TABLE>
<CAPTION>
               DATE OF AVAILABILITY FOR SALE                  NUMBER OF SHARES
               -----------------------------                  ----------------
<S>                                                           <C>
April 17, 2000 (180 days after the date of this
  prospectus)...............................................     19,499,495
At various times thereafter upon the expiration of one-year
  holding periods...........................................        567,500
</TABLE>

     Of these shares, 19,441,995 shares are subject to a limitation on the
number of shares that can be sold in any three-month period. We have agreed,
however, to register the resale of substantially all of these shares upon demand
beginning one year after the date of this prospectus.

     We intend to file a registration statement to register all shares of common
stock that we may issue to our employees under our equity incentive plan. After
this registration statement is effective, shares issued upon exercise of stock
options will be eligible for resale in the public market without restriction. As
of October 20, 1999, options and warrants to purchase 4,901,520 shares of our
common stock were issued and outstanding.

SOME SHARES IN THIS OFFERING MAY HAVE BEEN OFFERED IN VIOLATION OF THE
SECURITIES ACT OF 1933, WHICH COULD GIVE PURCHASERS OF THESE SHARES THE RIGHT TO
SEEK REFUNDS OR DAMAGES.

     In connection with the offering we decided that each of our employees,
officers and directors should have the opportunity to purchase up to 2,000
shares of common stock as part of a directed share program, on the same terms as
all other shares offered by the prospectus, but that each person could choose to
direct all or a part of the 2,000 shares to members of his or her immediate
family. In order to coordinate this program, prior to the effectiveness of the
Registration Statement for this offering we sent a letter to approximately 90
employees, officers and directors we had designated as potential offerees of up
to 390,000 shares of common stock and asked them to provide us with information
for mailing purposes, including an estimate of the number of shares that they
would want to be given the opportunity to purchase and to have their immediate
family members provide the same information. Our letter was not accompanied by a
preliminary prospectus and may have constituted a prospectus that does not meet
the requirements of the Securities Act of 1933. No person who received these
written materials should rely upon them in any manner in making a decision
whether to purchase shares of common stock in this offering. If the mailing of
these original materials did constitute a violation of the Securities Act of
1933, the recipients of the letter who purchased common stock in this offering
could have the right, for a period of one year from the date of their purchase
of common stock, to obtain recovery of the consideration paid in connection with
their purchase of common stock or, if they had already sold the stock, sue us
for damages resulting from their purchase of common stock. These refunds or
damages could total up to approximately $6.2 million, based on the initial
public offering price of $16.00 per share, in the event that investors suffer a
total loss of their investment during this period and seek refunds or damages.
If this were to occur, our business, results of operations and financial
condition could suffer.

                                       15
<PAGE>   16

                           FORWARD-LOOKING STATEMENTS

     This prospectus includes forward-looking statements relating to, among
other things, future results of operations, our plans and expectations regarding
our future services and operations and our investment in OpenSky, and general
industry and business conditions applicable to Aether. These include projections
about the industry contained on pages 30 to 31. We have based these
forward-looking statements on our current expectations and projections about
future events. These forward-looking statements are subject to a number of
risks, uncertainties and assumptions about Aether, including those we describe
in the "Risk Factors" section of this prospectus. In light of these risks,
uncertainties and assumptions, the forward-looking events discussed in this
prospectus might not occur. We undertake no obligation to publicly update or
revise any forward-looking statements, whether as a result of new information,
future events or otherwise.

     We use market data and industry forecasts and projections throughout this
prospectus, which we have obtained from internal surveys, market research,
publicly available information and industry publications. Industry publications
generally state that the information they provide has been obtained from sources
believed to be reliable, but that the accuracy and completeness of such
information is not guaranteed. The forecasts and projections are based on
industry surveys and the preparers' experience in the industry and there is no
assurance that any of the projected amounts will be achieved. Similarly, we
believe that the surveys and market research we or others have performed are
reliable, but we have not independently verified this information. Neither we
nor any of the underwriters represents that any such information is accurate.

                                       16
<PAGE>   17

                                USE OF PROCEEDS

     We expect to receive approximately $88.0 million in net proceeds from the
sale of 6,000,000 shares of common stock in this offering. We estimate the net
proceeds will be approximately $101.4 million if the underwriters' over-
allotment option is exercised in full. We estimate the expenses of this offering
will be approximately $1.3 million.

     The principal purposes of this offering are to obtain additional working
capital, to create a public market for our common stock and to facilitate our
future access to public equity markets. We intend to use approximately $14.8
million of net proceeds to repay in full all indebtedness incurred under the
senior secured interim credit facility with Merrill Lynch & Co., one of the
underwriters of this offering, of which $11.7 million was used to purchase
Mobeo, approximately $0.8 million was used to pay fees and expenses related to
the credit facility, and the remaining $2.3 million was allocated for general
corporate purposes. For a discussion of the procedures we have used as a result
of the fact that proceeds of the offering will be used to repay indebtedness to
one of the underwriters, including the use of a "qualified independent
underwriter," see "Underwriting -- NASD Regulations" at page 69. In addition, we
intend to use approximately $2.5 million of the net proceeds to exercise a
warrant to increase our ownership in OpenSky from 26% to up to 33% on a fully
diluted basis. We currently intend to use the remaining net proceeds from the
offering for general corporate purposes, which we expect will include
approximately $2.0 million over the next year to expand our network operations
center. We also may use proceeds to purchase additional interests in OpenSky to
maintain our percentage interest in OpenSky if OpenSky issues additional equity
interests. The amount necessary for this purpose would depend on the amount and
price of equity interests issued by OpenSky. We have not developed any specific
plans to date with respect to use of the remaining proceeds but expect to use
some portion of the proceeds to cover cash flow deficits. We have experienced
operating cash flow deficits of up to $4.4 million per year, and we expect cash
flow deficits to continue until our subscriber levels reach a level sufficient
to cover our operating expenses, which may be as long as 18 months or more. We
also expect our operating expenses will increase by an aggregate of
approximately $8 million through the end of 2000 for items such as enhanced
sales and marketing of our brand and products and enhancement of Mobeo's service
offerings. The extent to which offering proceeds will be used to cover these
expenses depends on the level of these and other expenses and the extent to
which our subscriber levels increase. Finally, if we identify acquisition
candidates that we believe advance our strategy, and proceeds of the offering
are available taking into consideration the needs described above, we may use
proceeds to fund acquisitions.

     Pending these uses, the net proceeds of this offering will be invested in
short-term, investment grade, interest-bearing instruments.

                                DIVIDEND POLICY

     We have never declared or paid any cash dividends on our capital stock or,
when we were organized as a limited liability company, made any distributions to
our members. We currently intend to retain earnings, if any, to support the
development of our business and do not anticipate paying cash dividends for the
foreseeable future. Payment of future dividends, if any, will be at the
discretion of our board of directors after taking into account factors such as
our financial condition, operating results and current and anticipated cash
needs.

                                       17
<PAGE>   18

                                 CAPITALIZATION

     The table below sets forth the following information as of June 30, 1999:

          - our actual capitalization;

          - our pro forma capitalization giving effect to Mobeo acquisition as
            if completed on June 30, 1999; and

          - our capitalization adjusted to give effect to (1) the pro forma
            adjustments described above, (2) the sale of 6,000,000 shares of
            common stock in this offering after deducting the underwriting
            discounts and commissions we expect to pay in connection with this
            offering and estimated offering expenses payable by us and (3) our
            conversion from a limited liability company to a corporation.

     This table should be read in conjunction with our financial statements and
the notes thereto and "Management's Discussion and Analysis of Financial
Condition and Results of Operations" beginning on page 22. Details regarding pro
forma adjustments are set forth in the Unaudited Pro Forma Condensed
Consolidated Financial Information beginning on page F-29.

<TABLE>
<CAPTION>
                                                                          AS OF JUNE 30, 1999
                                                              -------------------------------------------
                                                                               PRO           PRO FORMA
                                                                              FORMA        CONSOLIDATED
                                                                ACTUAL     CONSOLIDATED     AS ADJUSTED
                                                              ----------   ------------   ---------------
<S>                                                           <C>          <C>            <C>
Short-term debt:(1)
  Notes payable.............................................  $       --   $14,830,000      $        --
                                                              ----------   -----------      -----------
          Total short-term debt.............................          --    14,830,000               --
                                                              ----------   -----------      -----------
Limited liability company equity............................   4,840,882     5,214,882               --
Stockholders' equity:(2)
  Preferred stock, $0.01 par value; 1,000,000 shares
     authorized; 0 shares issued and outstanding (pro forma
     consolidated, as adjusted).............................          --            --               --
  Common stock, $0.01 par value; 75,000,000 shares
     authorized; 26,066,995 shares issued and outstanding
     (pro forma consolidated, as adjusted)..................          --            --          260,670
  Additional paid-in-capital................................          --            --       92,956,612
  Accumulated deficit(1)....................................          --            --         (830,000)
                                                              ----------   -----------      -----------
          Total stockholders' equity........................          --            --       92,387,282
                                                              ----------   -----------      -----------
          Total capitalization..............................  $4,840,882   $ 5,214,882      $92,387,282
                                                              ==========   ===========      ===========
</TABLE>

- ---------------

(1) We financed the acquisition of Mobeo with a senior secured interim credit
    facility, which will be repaid with the net proceeds of the offering.
    Deferred financing fees of $830,000 will be expensed at that time.
(2) The conversion from an LLC to a corporation has been accounted for on a
    historical cost basis.

                                       18
<PAGE>   19

                                    DILUTION

     If you invest in our shares of common stock, your interest will be diluted
by the amount of the difference between the public offering price per share of
common stock and the pro forma as adjusted net tangible book value per share of
common stock after this offering.

     Our pro forma net tangible book value as of June 30, 1999 was
$(11,309,116), or $(0.57) per share of common stock, after giving effect to:

     - the Mobeo acquisition; and

     - the conversion of Aether from a limited liability company to a
       corporation and the exchange of units of the limited liability company
       into shares of common stock of the corporation.

     Pro forma net tangible book value per share is equal to our total tangible
assets less total liabilities, divided by the number of outstanding shares of
common stock.

     After giving effect to our sale of 6,000,000 shares of common stock in this
offering, and after deducting the commissions and estimated offering expenses,
our as adjusted pro forma net tangible book value as of June 30, 1999 would have
been $76,693,284, or $2.96 per share of common stock. This figure represents an
immediate increase in net tangible book value of $3.53 per share of common stock
to existing stockholders and an immediate dilution of $13.04 per share of common
stock to new investors. Dilution is determined by subtracting the net tangible
book value per share of common stock after the offering from the amount of cash
a new investor pays for a share of common stock. The following table illustrates
this per share dilution to new investors:

<TABLE>
<S>                                                           <C>      <C>
Initial public offering price per share.....................           $16.00
  Pro forma net tangible book value per share as of June 30,
     1999...................................................  $(0.57)
  Increase per share attributable to this offering..........  $ 3.53
                                                              ------
Pro forma net tangible book value per share after this
  offering..................................................           $ 2.96
                                                                       ------
Dilution per share to new investors in this offering........           $13.04
                                                                       ======
</TABLE>

     The table below shows on a pro forma basis as of June 30, 1999, after
giving effect to the acquisition of Mobeo and the conversion of Aether from a
limited liability company into a corporation, the difference between our
existing stockholders and our new investors with respect to the number of common
shares purchased, the total consideration paid and the average price per share
paid, before deducting discounts and commissions and estimated offering
expenses:

<TABLE>
<CAPTION>
                                                      SHARES PURCHASED       TOTAL CONSIDERATION
                                                    --------------------    ----------------------   AVERAGE PRICE
                                                      NUMBER     PERCENT       AMOUNT      PERCENT     PER SHARE
                                                    ----------   -------    ------------   -------   -------------
<S>                                                 <C>          <C>        <C>            <C>       <C>
Existing stockholders.............................  19,877,855     76.8%    $ 16,010,052     14.3%      $ 0.81
New investors.....................................   6,000,000     23.2       96,000,000     85.7        16.00
                                                    ----------    -----     ------------    -----
       Total......................................  25,877,855    100.0      112,010,052    100.0
                                                    ==========    =====     ============    =====
</TABLE>

     If the underwriters exercise their over-allotment option in full, the
number of shares of common stock held by new investors will increase to
6,900,000, or 25.8% of the total common shares outstanding after this offering.

     As of June 30, 1999, as adjusted to reflect the conversion of Aether from a
limited liability company to a corporation, we had outstanding options to
purchase 1,931,250 shares under our equity incentive plan at a weighted average
exercise price of $1.04 and warrants to purchase 1,907,805 shares at a weighted
average exercise price of $.84 per share. In addition, we expect to have options
to purchase approximately 3.3 million additional shares available for future
grant under our equity incentive plan. If the option holders exercise these
outstanding options, or any options we grant in the future, there will be
further dilution to new investors.

                                       19
<PAGE>   20

                      SELECTED CONSOLIDATED FINANCIAL DATA
               (in thousands, except share and per share amounts)

     The table that follows presents portions of our financial statements and
are not complete. You should read the following selected consolidated financial
data together with our financial statements and related notes and with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" included elsewhere in this prospectus. The statement of operations
data for the years ended December 31, 1996, 1997 and 1998, and the balance sheet
data as of December 31, 1997 and 1998, are derived from our financial
statements, which have been audited by KPMG LLP, independent auditors, and which
are included in this prospectus beginning on page F-1. The balance sheet data as
of December 31, 1996 are derived from audited financial statements that do not
appear in this prospectus. The statement of operations data for the six months
ended June 30, 1998 and 1999 are derived from our unaudited financial statements
included in this prospectus beginning on page F-1 and include, in the opinion of
our management, all adjustments, consisting only of normal recurring
adjustments, that we consider necessary for the fair presentation of our
financial position and results of operations for those periods. The historical
results presented below are not necessarily indicative of the results to be
expected for any future fiscal year. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations" beginning on page 22.

     The pro forma consolidated financial information gives effect to the Mobeo
acquisition. The pro forma net loss per share information gives effect to our
conversion from a limited liability company to a corporation plus the offering
of shares covered by this prospectus and the application of the net proceeds as
described in "Use of Proceeds" on page 17. The pro forma consolidated as
adjusted balance sheet information gives effect to the acquisition of Mobeo and
the conversion to a corporation plus the offering of shares covered by this
prospectus and the application of the net proceeds as described in "Use of
Proceeds" on page 17.

     We have provided the pro forma consolidated information and the pro forma
consolidated as adjusted balance sheet for informational purposes only and you
should not assume that our results would actually have been as shown if we had
acquired Mobeo or if we had converted to a corporation or completed the offering
on the assumed dates, or that the information projects what our results will be
as a result of the Mobeo acquisition or after we convert to a corporation and
complete the offering. The pro forma consolidated statement of operations
information assumes that the transactions occurred on January 1, 1998, and the
pro forma consolidated balance sheet information assumes that the transactions
occurred on June 30, 1999. See our and Mobeo's financial statements and notes to
those statements included in this prospectus beginning on page F-1.

                                       20
<PAGE>   21
<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                   --------------------------------------------------------
                                                 HISTORICAL                      1998
                                   --------------------------------------      PRO FORMA
                                      1996         1997          1998        CONSOLIDATED
                                   ----------   -----------   -----------   ---------------
<S>                                <C>          <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenue:
 Subscriber revenue..............  $       --   $       161   $       549     $     9,130
 Engineering services revenue....       1,355         1,625           963             963
                                   ----------   -----------   -----------     -----------
     Total revenue...............       1,355         1,786         1,512          10,093
 Cost of subscriber revenue......          --           447           797           3,838
 Cost of engineering services
   revenue.......................       1,007           846           304             304
                                   ----------   -----------   -----------     -----------
     Total cost of revenue.......       1,007         1,293         1,101           4,142
                                   ----------   -----------   -----------     -----------
     Gross profit................  $      348   $       493   $       411     $     5,951
Operating expenses:
 Research and development........         161           734         1,267           1,764
 General and administrative......         395         1,505         2,773           4,591
 Selling and marketing...........          --           333           840           2,353
 Depreciation and amortization...          45           189           265           3,023
 Unit option and warrant
   expense.......................          --            40            33           1,667
                                   ----------   -----------   -----------     -----------
   Total operating expenses......         601         2,801         5,178          13,398
                                   ----------   -----------   -----------     -----------
Operating loss...................        (253)       (2,308)       (4,767)         (7,447)
Interest income, net.............           8             7            74              79
Gain (loss) on disposal of
 assets..........................          --            --            --             (14)
Equity in earnings (losses) of
 investments.....................        (172)         (144)           --              --
Realized loss on sale of
 investment......................          --          (302)           --              --
Other............................          --            --            --              --
                                   ----------   -----------   -----------     -----------
 Net loss before income tax......  $     (417)  $    (2,747)  $    (4,693)    $    (7,382)
                                   ----------   -----------   -----------     -----------
 Income tax provision............          --            --            --             539
 Net loss........................        (417)       (2,747)       (4,693)         (6,843)
 Pro forma net loss per
   share-basic and diluted.......  $    (0.04)  $     (0.22)  $     (0.29)    $     (0.31)
                                   ==========   ===========   ===========     ===========
 Pro forma weighted average
   shares used in computing net
   loss per share-basic and
   diluted.......................  10,554,795    12,655,901    15,916,383      21,916,383
                                   ==========   ===========   ===========     ===========

<CAPTION>
                                            SIX MONTHS ENDED JUNE 30,
                                   -------------------------------------------
                                          HISTORICAL                1999
                                   -------------------------      PRO FORMA
                                      1998          1999        CONSOLIDATED
                                   -----------   -----------   ---------------
<S>                                <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenue:
 Subscriber revenue..............  $       125   $       599     $     5,646
 Engineering services revenue....          436           188             188
                                   -----------   -----------     -----------
     Total revenue...............          561           787           5,834
 Cost of subscriber revenue......          200           531           2,288
 Cost of engineering services
   revenue.......................          171           120             120
                                   -----------   -----------     -----------
     Total cost of revenue.......          371           651           2,408
                                   -----------   -----------     -----------
     Gross profit................  $       190   $       136     $     3,426
Operating expenses:
 Research and development........          589         1,002           1,429
 General and administrative......        1,273         1,583           2,518
 Selling and marketing...........          314           555           1,359
 Depreciation and amortization...          124           194           1,577
 Unit option and warrant
   expense.......................           16         1,263           2,080
                                   -----------   -----------     -----------
   Total operating expenses......        2,316         4,597           8,963
                                   -----------   -----------     -----------
Operating loss...................       (2,126)       (4,461)         (5,537)
Interest income, net.............            7           141             156
Gain (loss) on disposal of
 assets..........................           --            --              --
Equity in earnings (losses) of
 investments.....................           --            --              --
Realized loss on sale of
 investment......................           --            --              --
Other............................           --            --             (50)
                                   -----------   -----------     -----------
 Net loss before income tax......  $    (2,119)  $    (4,320)    $    (5,431)
                                   -----------   -----------     -----------
 Income tax provision............           --            --             270
 Net loss........................       (2,119)       (4,320)         (5,161)
 Pro forma net loss per
   share-basic and diluted.......  $     (0.15)  $     (0.22)    $     (0.20)
                                   ===========   ===========     ===========
 Pro forma weighted average
   shares used in computing net
   loss per share-basic and
   diluted.......................   14,270,568    19,877,855      25,877,855
                                   ===========   ===========     ===========
</TABLE>

<TABLE>
<CAPTION>
                                                                                                 AS OF JUNE 30, 1999,
                                                                                      -------------------------------------------
                                                        AS OF DECEMBER 31,                                            PRO FORMA
                                                -----------------------------------                   PRO FORMA      CONSOLIDATED
                                                   1996        1997         1998        ACTUAL     CONSOLIDATED(1)   AS ADJUSTED
                                                ----------   ---------   ----------   ----------   ---------------   ------------
<S>                                             <C>          <C>         <C>          <C>          <C>               <C>
BALANCE SHEET DATA:
  Cash and cash equivalents...................  $       51   $     132   $    1,755   $      457      $  3,159         $76,331
  Working capital (deficit)...................         181        (323)       7,519        3,674       (10,199)         77,803
  Total assets................................       1,269         822        8,765        5,867        25,756          98,098
  Total debt(1)...............................          --         150           --           --        14,830              --
  Members' capital............................       1,101          74        8,030        4,841         5,215              --
  Stockholders' equity........................          --          --           --           --            --          92,387
</TABLE>

- ---------------

(1) We financed the acquisition of Mobeo through a senior secured interim credit
    facility, which will be repaid with the net proceeds of this offering.

                                       21
<PAGE>   22

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     You should read the following description of our financial condition and
results of operations in conjunction with the financial statements and the notes
thereto and the unaudited pro forma condensed consolidated financial information
included in this prospectus beginning on page F-1.

OVERVIEW

     Aether Systems LLC was originally formed as Aeros, L.L.C. in January 1996.
We changed our name to Aether Technologies International, L.L.C. effective
August 1996 and to Aether Systems LLC effective September 1999. Immediately
before we complete this offering, the limited liability company will be
converted into a corporation called Aether Systems, Inc.

     From our inception until March 1997, we primarily provided wireless
engineering services, including the development of wireless software
applications for customers. In March 1997, we began offering services that
provide the users of wireless handheld devices access to real-time financial
information. During 1997, we made a strategic decision to focus a significant
portion of our engineering resources on the development of these and other
wireless data services and systems, including our AIM package of wireless
messaging software and software development tools (also known as a software
platform) and other wireless data applications. This resulted in a decrease in
engineering services revenue as a percentage of total revenue and an increase in
subscriber revenue as a percentage of total revenue. We expect this trend to
continue in the foreseeable future with an increasing percentage of our revenue
being derived from subscriber revenue. We also expect to derive revenue from the
licensing of our AIM software platform.

     Our subscriber base was 150 and 687 for the years ended December 31, 1997
and December 31, 1998, respectively, and 982 for the six months ended June 30,
1999. The growth in subscribers over these periods was primarily the result of
the attraction of new subscribers to the service. Reuters MarketClip yearly
subscriptions started to expire in March 1999 and 75% of all subscribers
eligible to renew during the period from March to June 1999 renewed their
contracts for an additional one year period. Subscriber revenue was $161,400 and
$549,057 for the years ended December 31, 1997 and 1998, respectively, and
$598,810 for the six months ended June 30, 1999. Engineering services revenue
was $1.4 million, $1.6 million and $1.0 million for the years ended December 31,
1996, 1997 and 1998, respectively, and $188,274 for the six months ended June
30, 1999. We incurred net losses of approximately $416,980, $2.7 million and
$4.7 million for years ended December 31, 1996, 1997 and 1998, respectively, and
$4.3 million for the six months ended June 30, 1999.

     For the six months ended June 30, 1999, our cost to acquire subscribers was
greater than the revenue we expect to derive from those customers over the
initial one-year contract term. The cost to acquire subscribers during this
period was approximately $546,000 and the contracts entered into during that
period provide for payments of approximately $305,000 during the one-year term
of the contracts. We expect that revenue from new customers will exceed
subscriber acquisition costs as the number of subscribers increases to cover our
fixed costs, but this will depend on the rate at which subscriber levels
increase and we cannot determine when this will occur or assure you that it will
ever occur.

     On September 28, 1999, we acquired Mobeo, Inc. Mobeo provides employees and
customers of major banks and financial institutions with real-time price quotes
and news for foreign exchange, government securities and commodities markets on
wireless handheld devices. On a pro forma basis, giving effect to the Mobeo
acquisition, our revenue for the six months ended June 30, 1999 was $5.8
million. Mobeo accounted for 87% of this revenue.

     Mobeo's subscriber base was 2,811 and 3,339 at December 31, 1997 and
December 31, 1998, respectively, and 3,356 at June 30, 1999. The net increase in
subscriber base from the end of 1997 to the end of 1998 was due to new
subscriptions of 1,660 and termination of 1,132 subscriptions. The net increase
in subscribers from December 31, 1998 to June 30, 1999 was due to the
termination of 591 subscriptions, and 608 new subscriptions. We believe that a
substantial number of the terminations and additions are the result of changes
in personnel at financial institutions whose traders are Mobeo subscribers.
Mobeo subscriber revenue was $7.1 million and $8.6 million for the years ended
December 31, 1997 and 1998, respectively, and $5.0 million for the six months
ended June 30, 1999. Mobeo (on a stand-alone basis) reported net income for the
six months ended June 30, 1998 and 1999 of $278,870 and $19,677,

                                       22
<PAGE>   23

respectively. The decrease from 1998 to 1999 was primarily attributable to
increases in operating expenses of $726,250 offset in part by an increase in
gross profits of $345,880 as described in detail in Results of Operations,
below. On a stand-alone basis, Mobeo reported a net loss for the years ended
December 31, 1998 and 1997 of $100,893 and $387,656, respectively. The decrease
in net loss from 1998 to 1999 was primarily attributable to an increase in gross
profits of $1.6 million partially offset by an increase in operating expenses of
$1.2 million as described in detail in Results of Operations below. Mobeo has
reported net losses for full years and net income for partial years because, as
a closely held company, Mobeo has recorded as compensation expense in each year
amounts paid to senior officers at year-end that typically equalled income
earned during the year. As a result of our acquisition of Mobeo, most of this
compensation expense to senior officers will no longer be paid as these senior
officers are no longer employed by Mobeo or us.

     In August 1999, we entered into a joint venture with 3Com called OpenSky.
We and 3Com formed OpenSky to pursue opportunities in the emerging consumer and
business mass markets for wireless internet access, e-mail and Internet and
other electronic transaction applications. We have entered into a letter
agreement with OpenSky that requires OpenSky to pay us $3 million over a
12-month period ending in June 2000 in exchange for engineering services. We
have also given OpenSky a perpetual, non-exclusive, non-assignable, royalty
free, worldwide license to our AIM software platform. We have the right to offer
OpenSky's services to our subscribers in exchange for a monthly fee of $3 per
subscriber.

     Since our inception, we have invested significant capital to build our
customer service and network operations center. Additionally, we have incurred
significant operating costs to develop our AIM software platform and other
software applications and to grow our business. As a result, we have incurred
operating losses since our inception. Part of our strategy is to continue to
invest in business development, research and development and marketing and
advertising. As a result, we expect to continue to incur operating losses for at
least the next several quarters.

RESULTS OF OPERATIONS

     We derive our revenue from the sale of wireless data services and by
providing wireless engineering services. As a result of the Mobeo acquisition,
we also derive revenue from the sale of Mobeo's wireless foreign exchange
information services. Revenue from wireless data services consists of:

     - a one time non-refundable activation fee, which we recognize upon service
       activation;

     - monthly service fees, which we recognize as services are provided to the
       subscriber; and

     - monthly exchange fees for access to financial information from the
       securities exchanges and markets, which we recognize as services are
       provided to the subscriber. We remit these fees to the various exchanges
       and markets on a regular basis.

As part of our service offerings, we also provide our subscribers with the
option to purchase wireless handheld devices from us at cost, which we bill over
the initial term of the contract.

     We also expect to derive revenue from the licensing of our AIM software
platform. We currently have one customer who is licensing our AIM software
platform but anticipate additional customers in the future.

     Contracts with our wireless data subscribers are for a one-year period and
include a termination penalty if cancelled by the subscriber before the one-year
term expires. These contracts are generally renewable at the option of the
subscriber for additional one-year periods or otherwise continue on a monthly
basis until cancelled by the subscriber. Revenue from wireless engineering
services consists of amounts billed to our customers for engineering time on an
hourly basis or on a fixed per project basis. This revenue is recognized as the
work is performed.

     Cost of subscriber revenue consists primarily of airtime costs, financial
data costs, wireless handheld device costs and securities exchange and market
fees. Our airtime costs are determined by agreements we have with several
wireless carriers. Typically, we have one-year contracts to buy data network
capacity either for an agreed amount of kilobytes at a flat fee or on a
cents-per-kilobyte basis. Cost of engineering services revenue consists of cash
compensation and related costs for engineers and other non-reimbursed,
project-related costs.

     Research and development expenses consist primarily of cash compensation
and related costs for engineers engaged in research and development activities
and, to a lesser extent, costs of materials relating to these activities. We
expense research and development costs as we incur them. General and
administrative expenses consist primarily of cash compensation and related costs
for general corporate and business development personnel, along with rent and

                                       23
<PAGE>   24

other costs. Selling and marketing expenses consist primarily of advertising and
promotions, sales and marketing personnel, travel and entertainment and other
costs.

     Depreciation and amortization expenses consist primarily of depreciation
expenses arising from equipment purchased for our network operations center and
other property and equipment purchases. On a pro forma basis, giving effect to
the Mobeo acquisition, depreciation and amortization expenses consist primarily
of amortization related to goodwill and other intangibles to be recognized as a
result of the Mobeo acquisition.

     Unit option and warrant expense consists of expenses recorded to account
for the difference, on the date of grant, between the fair market value and the
exercise price of unit options issued to employees and the fair value of equity-
based awards to non-employees.

     Net interest income consists primarily of interest earned on cash and cash
equivalents and short-term investments, net of fees paid to fund managers and
interest expense on monies borrowed.

SIX MONTHS ENDED JUNE 30, 1998 AND 1999

     Subscriber revenue. Subscriber revenue increased from $124,576 for the six
months ended June 30, 1998 to $598,810 for the six months ended June 30, 1999.
The increase was primarily due to additional subscribers associated with the
launch of Reuters MarketClip, and we expect a significant portion of future
revenue to come from financial services and online trading products.

     On a pro forma basis, giving effect to the Mobeo acquisition, subscriber
revenue for the six months ended June 30, 1999 was $5.6 million. Mobeo accounted
for 89% of this subscriber revenue. Subscriber revenue for Mobeo increased from
$4.5 million for the six months ended June 30, 1998 to $5.0 million for the six
months ended June 30, 1999. This increase was primarily due to price increases
for Mobeo's foreign exchange information services.

     Engineering services revenue. Engineering services revenue decreased from
$436,090 for the six months ended June 30, 1998 to $188,274 for the six months
ended June 30, 1999. This decrease was primarily due to our decision to focus
our efforts on developing our AIM software platform and on wireless data
services.

     Cost of subscriber revenue. Cost of subscriber revenue increased from
$199,559 for the six months ended June 30, 1998 to $530,823 for the six months
ended June 30, 1999. The increase was primarily due to an increase in the number
of subscribers to Reuters MarketClip, which was launched in March 1998. We
expect the number of subscribers for financial services and online trading
products to increase, resulting in an increase in the cost of subscriber
revenue.

     On a pro forma basis, giving effect to the Mobeo acquisition, cost of
subscriber revenue for the six months ended June 30, 1999 was $2.3 million.
Mobeo accounted for 77% of this cost. Cost of subscriber revenue for Mobeo
increased from $1.5 million for the six months ended June 30, 1998 to $1.8
million for the six months ended June 30, 1999. This increase was primarily due
to an increase in airtime charges of $630,000 offset by cost savings of $330,000
relating to a change in financial data providers.

     Cost of engineering services revenue. Cost of engineering services revenue
decreased from $170,812 for the six months ended June 30, 1998 to $119,829 for
the six months ended June 30, 1999. This decrease was primarily due to a
decrease in engineering services as discussed above.

     Research and development expenses. Research and development expenses
increased from $589,148 for the six months ended June 30, 1998 to $1.0 million
for the six months ended June 30, 1999. This increase was primarily due to the
hiring of additional engineers for increased research and development activities
associated with the development of our AIM software platform and wireless data
services. We expect to continue to make substantial investments in research and
development and anticipate that these expenses will continue to increase.

     On a pro forma basis, giving effect to the Mobeo acquisition, research and
development expenses for the six months ended June 30, 1999 were $1.4 million.
Mobeo accounted for 30% of these expenses. Research and development expenses for
Mobeo increased from $168,355 for the six months ended June 30, 1998 to $427,210
for the six months ended June 30, 1999. This increase was primarily due to
additional expenses associated with the development of wireless software
applications.

                                       24
<PAGE>   25

     General and administrative expenses. General and administrative expenses
increased from $1.3 million for the six months ended June 30, 1998 to $1.6
million for the six months ended June 30, 1999. This increase was primarily due
to the addition of personnel performing general corporate and business
development activities. We expect general and administrative expenses to
increase as we add personnel and incur additional expenses related to the
anticipated growth of our business and our operation as a public company.

     On a pro forma basis, giving effect to the Mobeo acquisition, general and
administrative expenses for the six months ended June 30, 1999 were $2.5
million. Mobeo accounted for 37% of these expenses. General and administrative
expenses for Mobeo increased from $1.2 million for the six months ended June 30,
1998 to $1.5 million for the six months ended June 30, 1999, before pro forma
adjustment. This increase was primarily due to increased personnel and related
costs.

     Selling and marketing expenses. Selling and marketing expenses increased
from $313,775 for the six months ended June 30, 1998 to $555,428 for the six
months ended June 30, 1999. Of this increase $170,075 was primarily due to an
increase in advertising and promotion costs related to the launch of Reuters
MarketClip in March 1998 and $71,578 was due to an increase in personnel related
expenses. We expect selling and marketing expenses to increase significantly as
we incur additional expenses to increase brand awareness and add personnel.

     On a pro forma basis, giving effect to the Mobeo acquisition, selling and
marketing expenses for the six months ended June 30, 1999 were $1.4 million.
Mobeo accounted for 59% of these expenses. Selling and marketing expenses for
Mobeo increased from $1.0 million for the six months ended June 30, 1998 to $1.3
million for the six months ended June 30, 1999, before pro forma adjustment.
This increase was primarily due to increased personnel costs of $118,300 and
increased advertising and marketing costs of $126,450.

     Depreciation and amortization. Depreciation and amortization expenses
increased from $123,820 for the six months ended June 30, 1998 to $193,523 for
the six months ended June 30, 1999. This increase was primarily due to an
increase in the purchase of property and equipment related to the expansion of
our corporate offices.

     On a pro forma basis, giving effect to the Mobeo acquisition, depreciation
and amortization expenses for the six months ended June 30, 1999 were $1.6
million. This amount primarily reflects amortization related to goodwill and
other intangibles to be recognized as a result of the Mobeo acquisition.

     Unit option and warrant expense. Unit option and warrant expense increased
from $16,290 for the six months ended June 30, 1998 to $1.3 million for the six
months ended June 30, 1999. Of this increase $861,990 was primarily due to the
fact that warrants held by 3Com to acquire 57,466 units became exercisable in
the six months ended June 30, 1999 and $384,920 relates to an increase in the
number of options that vested during the period with exercise prices less than
the fair value on the date of grant.

     On a pro forma basis, giving effect to the Mobeo acquisition, unit option
and warrant expense for the six months ended June 30, 1999 was $2.1 million. The
increase from Aether's historical amount is primarily due to expenses associated
with options expected to be granted to the selling stockholders of Mobeo for
consulting and employee services.

     Interest income, net. Net interest income increased from $7,035 for the six
months ended June 30, 1998 to $140,753 for the six months ended June 30, 1999.
The increase was primarily due to increased cash balances as a result of our
private placement financings completed in August 1998 and October 1998.

FISCAL YEARS ENDED DECEMBER 31, 1996, 1997 AND 1998

     Subscriber revenue. There was no subscriber revenue recognized for the year
ended December 31, 1996. Subscriber revenue increased from $161,400 to $549,057
for the years ended December 31, 1997 and December 31, 1998, respectively. The
increase in subscriber revenue was primarily due to the launch of Reuters
MarketClip in March 1998.

     On a pro forma basis, giving effect to the Mobeo acquisition, subscriber
revenue for the year ended December 31, 1998 was $9.1 million. Mobeo accounted
for 94% of this subscriber revenue. Subscriber revenue for Mobeo increased from
$6.5 million to $7.1 million for the years ended December 31, 1996 and December
31, 1997, respectively and to $8.6 million for the year ended December 31, 1998.
The increase from 1996 to 1997 was primarily
                                       25
<PAGE>   26

due to an increase in the number of subscribers and the increase from 1997 to
1998 was primarily due to price increases for Mobeo's foreign exchange
information services.

     Engineering services revenue. Engineering services revenue increased from
$1.4 million to $1.6 million for the years ended December 31, 1996 and December
31, 1997, respectively, and decreased to $1.0 million for the year ended
December 31, 1998. The increase in engineering services revenue from 1996 to
1997, was primarily due to increased engineering services activities. One of our
investors accounted for approximately 83% and 37% of engineering services
revenue for 1996 and 1997, respectively. The decrease in engineering services
revenue from 1997 to 1998 was primarily due to our decision to focus our efforts
on developing our AIM software platform and wireless data services.

     Cost of subscriber revenue. There was no cost of subscriber revenue for the
year ended December 31, 1996. Cost of subscriber revenue increased from $447,480
to $797,165 for the years ended December 31, 1997 and December 31, 1998,
respectively. We began to incur costs of subscriber revenue in 1997 with the
March 1997 launch of our AirBroker service. The increase in the cost of
subscriber revenue from 1997 to 1998 was primarily due to the launch of the
Reuters MarketClip service in March 1998. We expect the number of subscribers
for financial services and on-line trading products to increase resulting in an
increase in the cost of subscriber revenue.

     On a pro forma basis, giving effect to the Mobeo acquisition, cost of
subscriber revenue for the year ended December 31, 1998 was $3.8 million. Mobeo
accounted for 79% of these costs. Cost of subscriber revenue for Mobeo increased
from $2.9 million for the year ended December 31, 1996 to $3.1 million for the
year ended December 31, 1997 and decreased to $3.0 million for the year ended
December 31, 1998. The increase from 1996 to 1997 was primarily due to an
increase in the number of subscribers and the decrease from 1997 to 1998 was
primarily due to cost savings related to a change in financial data providers.

     Cost of engineering services revenue. Cost of engineering services revenue
decreased from $1.0 million to $846,140 for the years ended December 31, 1996
and December 31, 1997, respectively, and decreased to $304,137 for the year
ended December 31, 1998. These decreases were primarily due to our decision to
focus our efforts on developing our AIM software platform and wireless data
services.

     Research and development expenses. Research and development expenses
increased from $160,597 to $733,630 for the years ended December 31, 1996 and
December 31, 1997, respectively, and increased to $1.3 million for the year
ended December 31, 1998. These increases in research and development expenses
were primarily due to the hiring of additional engineers for increased research
and development activities associated with the development of our AIM software
platform and wireless data services.

     On a pro forma basis, giving effect to the Mobeo acquisition, research and
development expenses for the year ended December 31, 1998 were $1.8 million.
Mobeo accounted for 28% of these expenses. Research and development expenses for
Mobeo increased from $94,609 to $174,867 for the years ended December 31, 1996
and December 31, 1997, respectively and to $496,570 for the year ended December
31, 1998. The increase from 1997 to 1998 was primarily due to an increase in the
number of engineering personnel and the increase from 1997 to 1998 was primarily
due to additional expenses associated with the development of wireless software
applications.

     General and administrative expenses. General and administrative expenses
increased from $395,209 to $1.5 million for the years ended December 31, 1996
and December 31, 1997, respectively and increased to $2.8 million for the year
ended December 31, 1998. These increases were primarily due to the addition of
personnel performing general corporate and business development functions.

     On a pro forma basis, giving effect to the Mobeo acquisition, general and
administrative expenses for the year ended December 31, 1998 were $4.6 million.
Mobeo accounted for 40% of these expenses. General and administrative expenses
for Mobeo increased from $1.1 million to $1.9 million for the years ended
December 31, 1996 and December 31, 1997, respectively, and to $2.7 million for
the year ended December 31, 1998, before pro forma adjustment. The increase from
1996 to 1997 was primarily due to a $235,000 increase in personnel and related
costs and a $40,000 increase in network support costs. In addition, general and
administrative expenses were reduced in 1996 by the reversal of $336,000
reserved in 1995 for a potential liability related to a data provider contract
termination and general and administrative expenses increased by $122,000 in
1997 due to a change in accounting

                                       26
<PAGE>   27

policy relating to inventory of paging equipment. The increase from 1997 to 1998
was primarily due to increased personnel and related costs.

     Selling and marketing expenses. There were no selling and marketing
expenses for the year ended December 31, 1996. Selling and marketing expenses
increased from $333,191 to $840,455 for the years ended December 31, 1997 and
December 31, 1998, respectively. Of this increase $324,152 was primarily due to
an increase in advertising and promotion costs related to the launch of Reuters
MarketClip in March 1998 and $183,112 relates to an increase in personnel and
costs associated with sales and marketing.

     On a pro forma basis, giving effect to the Mobeo acquisition, selling and
marketing expenses for the year ended December 31, 1998 were $2.4 million. Mobeo
accounted for 64% of these expenses. Selling and marketing expenses for Mobeo
increased from $1.6 million to $1.8 million for the years ended December 31,
1996 and December 31, 1997, respectively, and to $2.3 million for the year ended
December 31, 1998 before pro forma adjustment. The increase from 1996 to 1997
was primarily due to a $50,000 increase in marketing costs, a $40,000 increase
in advertising costs and a $70,000 increase in sales commissions. The increase
from 1997 to 1998 was primarily due to increased personnel overhead costs.

     Depreciation and amortization expenses. Depreciation and amortization
expenses increased from $45,245 to $189,160 for the years ended December 31,
1996 and December 31, 1997, respectively, and increased to $264,685 for the year
ended December 31, 1998. These increases were primarily due to additional
capital expenditures.

     On a pro forma basis, giving effect to the Mobeo acquisition, depreciation
and amortization expenses for the year ended December 31, 1998 were $3.0
million. This amount primarily reflects amortization related to goodwill and
other intangibles to be recognized as a result of the Mobeo acquisition.

     Unit option and warrant expense. There was no unit option and warrant
expense for the year ended December 31, 1996. Unit option and warrant expense
decreased from $40,277 to $32,580 for the years ended December 31, 1997 and
December 31, 1998, respectively. The increase in unit option and warrant expense
for 1997 and the decrease for 1998 reflect changes in the extent to which
options became exercisable during the period with exercise prices less than the
fair value on the date of grant.

     On a pro forma basis, giving effect to the Mobeo acquisition, unit option
and warrant expense for the year ended December 31, 1998 were $1.7 million. The
increase from Aether's historical amount is primarily due to expenses associated
with options expected to be granted to the selling stockholders of Mobeo for
consulting and employee services.

     Interest income, net. Net interest income decreased from $8,491 to $7,788
for the years ended December 31, 1996 and December 31, 1997, respectively, and
increased to $74,180 for the year ended December 31, 1998. The increase for 1998
was primarily due to increased cash balances as a result of our private
placement financings completed in August 1998 and October 1998.

     Equity in losses of investments. Our equity in the loss of Real World
Solutions, a joint venture, and Navox, Inc., was $172,487 and $144,825 for the
years ended December 31, 1996 and December 31, 1997, respectively. These amounts
related to losses of Real World Solutions and Navox, Inc. recorded by us under
the equity method of accounting.

     Realized loss on sale of investment. In the year ended December 31, 1997,
we sold our interest in Real World Solutions and recorded a loss of $302,145.

LIQUIDITY AND CAPITAL RESOURCES

     Since our inception, we have financed our operations primarily through
private placements of our equity securities, which have resulted in net proceeds
of $15.7 million through June 30, 1999. As of June 30, 1999, we had $4.4 million
in cash and short-term investments and $3.7 million of working capital.

     Net cash used in operating activities was $346,200, $1.5 million and $4.4
million for the years ended December 31, 1996, 1997 and 1998, respectively, and
$2.5 million for the six months ended June 30, 1999. The principal use of cash
in each of these periods was to fund our losses from operations.

                                       27
<PAGE>   28

     Net cash used in investing activities was $1.2 million, $209,723, and $6.5
million for the years ended December 31, 1996, 1997 and 1998, respectively, and
cash provided from investing activities was $1.2 million for the six months
ended June 30, 1999. Cash used in investing activities for the year ended
December 31, 1996 was primarily for the purchase of a joint venture interest in
Real World Solutions and for purchases of property and equipment. Cash used in
investing activities for the year ended December 31, 1997 was primarily for the
purchase of property and equipment offset in part by proceeds from the sale of
our joint venture interest in Real World Solutions. Cash used in investing
activities for the year ended December 31, 1998 was primarily for the purchase
of short-term investments. For the six months ended June 30, 1999 we generated
cash from investment activities from the sale of short-term investments offset
in part by the purchase of property and equipment.

     Net cash provided by financing activities was $1.6 million, $1.8 million
and $12.5 million for the years ended December 31, 1996, 1997 and 1998,
respectively. Cash provided by financing activities in each of these periods was
primarily attributable to proceeds from additional private sales of our equity
securities. There was no financing activity in the six months ended June 30,
1999.

     On September 28, 1999, we borrowed $14.8 million under a senior secured
interim credit facility with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner
& Smith Incorporated, one of the underwriters of this offering, and Merrill
Lynch Capital Corporation. The loan is due and payable one year from the closing
date, with the possibility of a single extension up to one year. We can prepay
the loan at any time without any penalty. Interest on borrowings under the
credit facility will accrue at a rate of, at our option, either LIBOR plus a
specified margin which increases over time or the lender's base rate plus a
specified margin which also increases over time. The current interest rate per
annum is 11.1%. The facility is secured by substantially all of our assets and
the assets of our subsidiaries. The subsidiaries have also guaranteed repayment
under the credit facility. The credit facility contains terms and conditions
typical for credit facilities of this type and size and also includes financial
covenants. We intend to repay the loan in full upon completion of this offering,
at which time the credit facility will terminate.

     In connection with this credit facility, Merrill Lynch Capital Corporation
has received warrants to purchase up to 2,419,690 shares of our common stock for
no consideration. These warrants only become exercisable if the credit facility
is not repaid in a timely manner. If we repay the loan in full out of the
proceeds of the offering, the warrants will become void and no shares will be
issued.

     For the remainder of 1999, we expect to have the following expenditures and
requirements:

     - $2.5 million to exercise a warrant to increase our interest in OpenSky;

     - $2.0 million for expansion of our network operations center;

     - enhancement of Mobeo's service offerings;

     - increases in sales and marketing expenditures;

     - research and development; and

     - other working capital needs to grow our business.

We may also need funds to complete any acquisitions we may decide to pursue.

YEAR 2000 READINESS

     Many currently installed computer systems and software products are coded
to accept or recognize only two digits rather four digits to define the year in
the date code field. These systems and software products will need to accept
four digit year entries to distinguish 21st century dates from 20th century
dates. Systems and products that are not corrected to do this could cause a
disruption of operations including a temporary inability to process
transactions, send invoices or engage in other normal business activities. We
maintain a significant number of computer software systems and operating systems
across our entire organization which are potentially subject to year 2000
problems.

     We have taken several steps to prepare for the year 2000 transition. We
developed all our in-house software, including our AIM software platform, using
four digit date codes. We run all these applications on hardware and operating
systems that we have determined are year 2000 compliant. All our computer
hardware has been inventoried

                                       28
<PAGE>   29

and checked against the manufacturers' year 2000 compliance declarations. All
non-compliant hardware has been upgraded if possible, or replaced. All
third-party software, including operating systems and applications, have been
inventoried and checked against the manufacturers' compliance statements. We
have upgraded and fixed software as recommended by the manufacturers.

     We are actively seeking assurances from external entities that could affect
our business. We have been advised by our data providers, landline and wireless
network carriers, device manufacturers and current corporate customers that
their systems that might impact our own systems are year 2000 compliant.

     We are developing a contingency plan to deal with failures that may occur
during the year 2000 transition. By the end of November 1999, we expect to
finish our contingency plan which will involve developing alternate methods to
provide mission-critical functions if they fail.

     The most likely worst case scenario would be the failure of the landline or
wireless networks that carry data to us or from us to our customers. If this
happened, we would not be able to deliver our services to our customers and we
may lose revenue.

     Any failure on the part of Mobeo or its data providers or network carriers
to maintain computer hardware and software that is year 2000 compliant could
adversely impact our business. In connection with the Mobeo acquisition, Mobeo
has represented to us that its computer hardware and software are year 2000
compliant.

     Although we have taken the steps described above to make our systems year
2000 compliant, we may experience material problems and expenses associated with
year 2000 compliance that could adversely affect our business, results of
operations and financial condition. If the assurances we have received from
third parties or Mobeo regarding their compliance are inaccurate we may
experience disruption resulting in additional expense and loss of revenue. We
are also subject to outside forces that might generally affect industry and
commerce, such as year 2000 compliance failures by utility or transportation
companies. If our customers experience disruptions related to our services and
software systems, they may begin litigation against us even if the disruptions
were caused by their own systems or software provided by others.

     We have purchased most of our equipment within the last four years, which
has kept the costs of year 2000 compliance efforts to a minimum. All
non-compliant software and equipment has been upgraded or replaced at a cost
that is not material to us and our total costs relating to year 2000 compliance
have been less than $100,000. Based on our review of compliance to date, we do
not expect any future costs related to year 2000 compliance to be material.

NEW ACCOUNTING PRONOUNCEMENTS

     In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities. The new standard establishes accounting and
reporting standards for derivative instruments, including certain derivative
instruments embedded in other contracts and for hedging activities. The
statement, as amended, is effective for all fiscal quarters of all fiscal years
beginning after June 15, 2000. The statement is not expected to affect us as we
currently do not engage or plan to hold derivative instruments or engage in
hedging activities.

QUALITATIVE AND QUANTITATIVE DISCLOSURE REGARDING MARKET RISK

     We have limited exposure to financial market risks, including changes in
interest rates. We manage our interest rate risk exposure by investing in debt
obligations with varying maturity dates. We have $14.8 million in floating rate
debt held by Merrill Lynch & Co., one of the underwriters of this offering. We
have not entered into any agreements that hedge the effect of changes in rates
on this indebtedness. At June 30, 1999, we had short-term investments of
approximately $4.0 million. These short-term investments consisted of highly
liquid investments in debt obligations of the U.S. Government and other
highly-rated entities with maturities of up to 30 years. These investments are
classified as available-for-sale and are considered short-term, because we
expect to sell them within 12 months. These investments are subject to interest
rate risk and will fall in value if market interest rates increase. At June 30,
1999, the value of our short-term investments was approximately $190,000 less
than our cost. If market interest rates continue to rise, the value of our
short-term investments will continue to decrease. We expect to sell these
investments prior to maturity, and therefore we may not realize the full value
of these investments. We currently hold no derivative instruments and do not
earn foreign-source income. We expect to invest only in short-term, investment
grade, interest-bearing instruments.

                                       29
<PAGE>   30

                                    BUSINESS

OVERVIEW

     We provide wireless data services and systems enabling people to use
wireless handheld devices for real-time data communications and transactions. We
offer a broad range of capabilities necessary to design, develop, sell and
support a full range of wireless data services. We can offer these capabilities
because of our engineering expertise, our wireless integration software and our
customer service and network operations center.

MARKET OPPORTUNITY

  Growth of the Internet, Intranets and Extranets

     The Internet and businesses' internal data networks, or intranets, have
emerged as global communications channels that allow users to share information
and conduct real-time business electronically. According to publicly available
industry estimates, there were approximately 150 million users of the Internet
at the end of 1998 and the number of users will increase to 500 million by the
end of 2003. Technology and communications research firm International Data
Corporation, or IDC, has published estimates that by 2001 there will be 133
million global intranet users. Businesses are also increasingly employing
extranets, which allow them to communicate and conduct transactions
electronically with their customers and suppliers. Forrester Research forecasts
that business to business electronic and internet commerce in the U.S. will
increase from an estimated $100 billion in 1999 to $1,300 billion in 2003. All
of the projections and estimates in this "Market Opportunity" section are based
on the qualifications described on page 16 of this prospectus.

  Growth of Mobile Communications

     Individuals are increasingly using mobile devices for convenience and
enhanced productivity when away from their home or office. The Yankee Group, a
technology and communications market research firm, estimates that in the U.S.
there were approximately 68.7 million subscribers to wireless voice services at
the end of 1998 and that there will be 152.8 million by the end of 2003. Use of
wireless telecommunications has grown rapidly as cellular, paging and personal
communications systems, or PCS, have become more widely available and affordable
for both the business and mass consumer markets. Advances in technology,
regulatory changes, the introduction of new service providers and price
reductions have contributed to this growth.

  Growth of Wireless Data Applications and Communications

     We believe an increasing number of people will carry wireless devices for
data communications rather than for voice communications alone. The latest
wireless communications devices in the United States, including handheld
personal organizers, notebook computers, pagers and mobile phones, are smaller,
less expensive, have longer battery life and more features than earlier devices.
According to publicly available estimates, the U.S. wireless data market will
grow from 3 million subscribers in 1999 to 36 million subscribers in 2003.

     The market for wireless data applications is driven by the increased
reliance on the Internet, intranets and extranets and the emergence of a mobile
workforce. IDC forecasts that the remote and mobile workforce in the United
States will grow from 35.7 million individuals at the end of 1999 to 47.1
million at the end of 2003. Having grown accustomed to and dependent on the
information and applications available on their personal computers, we believe
workers and consumers want access to similar information when away from their
office or home.

  Attractiveness of Financial Market Applications

     The availability of real-time information, price quotes and trading
capabilities is critical to financial market participants, both professionals
and individuals. We believe that news, stock prices and other financial
information are among the most accessed content on the Internet. The Internet
has also enabled the growth of online trading activity. According to the Yankee
Group, the number of U.S. households investing online is expected to continue
its rapid growth, from 7.1 million in 1998 to 31.0 million in 2003.

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<PAGE>   31

  Increased Outsourcing Trends

     As information technology, or IT, systems have become more complex,
companies have increasingly outsourced many of their IT requirements. U.S. firms
are now spending 20% of their IT budgets on outsourcing services, according to
the industry trade publication Internet Week. These include packaged application
software implementation and support, customer support and network development
and maintenance. Companies are choosing to focus on their core businesses and
seeking to reduce costs associated with developing and maintaining IT networks
and software applications. In addition, by outsourcing, companies avoid major
challenges faced in hiring and retaining qualified IT employees and realize
increased time-to-market benefits.

THE AETHER SOLUTION

     Through our engineering staff, our AIM package of wireless messaging
software and development tools (also known as a software platform) and our
customer service and network operations center, we provide the services and
resources necessary to deliver wireless data systems. Our capabilities address
most of the common issues companies face when building wireless data systems.

     Issue:  Wireless data communications systems are complex.

        Many information technology managers lack the engineers and system
        resources to design, develop, install and maintain new software and
        systems that give their companies' workforces and customers mobile
        access to internal desktop applications.

     Solution:  We provide comprehensive wireless communications services.

        We have all the resources necessary to design, develop, install and
        maintain wireless data communications systems for customers. We have 27
        engineers who have on average more than ten years of wireless data
        experience. Our engineers use our AIM software platform to extend
        corporate applications to almost any wireless environment. We have
        established relationships with the leading wireless network carriers,
        including AT&T Wireless Services, Bell Atlantic Mobile, BellSouth
        Wireless Data and Ameritech Corp. We have negotiated favorable airtime
        agreements with these carriers, allowing us to offer our end users
        flat-rate pricing no matter how much data is transmitted or where a
        device is used. Our network operations center offers a secure gateway to
        wireless networks for data delivered to us by our customers, and our
        customer service center provides devices and call center support to end
        users. We provide as many, or as few, of these elements as customers
        require to develop their systems.

     Issue:  There is a wide variety of incompatible standards.

        To build a wireless data system, a business must integrate incompatible
        networks, devices and operating systems. Companies often require
        multiple networks to meet the needs of their workers and customers,
        based on their geographic location and preferred devices, which may use
        different communications protocols. This can involve complex
        negotiations with several wireless carriers. Additionally, companies
        typically use a variety of operating systems for their internal data
        applications.

     Solution:  Our software and systems can integrate a wide variety of
                networks, devices and operating systems.

        We give our customers a high degree of flexibility and choice, freeing
        them from the need to integrate technologies from a variety of parties
        to develop their systems. Our AIM software platform interacts with the
        most widely used data network systems, known as CDPD and Mobitex as well
        as with dial-up circuit connections. As a result, our customers' end
        users can choose the devices they prefer, including Palm, Windows CE and
        other personal organizers, notebook computers, pagers and mobile phones.
        We support and develop applications for the Wireless Applications
        Protocol, known as WAP, a series of specifications that allow mobile
        phones to display Internet information. We also are planning to extend
        our AIM software platform's capabilities to the Microsoft micro-browser
        and the operating system known as EPOC for handheld devices developed by
        Symbian Ltd. (a wireless software company jointly owned by Ericsson,
        Matsushita Communication Industrial Co., Ltd., Motorola, Nokia and Psion
        plc). Our AIM software platform can interact with the major operating
        systems on which most corporate applications run, including Windows NT,
        UNIX, Linux and most mainframe operating systems. As connections to new
        systems have
                                       31
<PAGE>   32

        become needed, our engineers have adapted our AIM software platform to
        meet the needs of those systems. We believe that as the wireless data
        market evolves there will continue to be a multitude of protocols for
        networks, devices and operating systems. We plan to update our AIM
        software platform continually to address the ongoing need to integrate
        these protocols. We believe we are the only firm that currently provides
        this level of service to companies seeking to develop wireless data
        systems.

     Issue:  Wireless data transmissions are slow and expensive.

        Most of today's wireless data networks operate at less than half the
        speed of telephone dial-up connections, limiting the delivery of useful
        data to only small amounts of text and few graphics. Data feeds
        typically include large amounts of unnecessary data, including message
        headers and routing information. Because wireless carriers typically
        charge by the kilobyte of data transmitted, extraneous data add
        unnecessary cost.

     Solution:  Our systems optimize data transmissions for wireless networks.

        Our AIM software platform optimizes data transmission by employing
        compression and data-thinning techniques. As a result, users get
        information faster when they send queries from their devices, and they
        get more useful information for the price. Our AIM software platform
        reduces the number of data packets required in a typical wireless
        transmission by as much as 66%. We ensure reliable message delivery
        through measures that confirm data have arrived properly and resend data
        if no acknowledgement has been received.

        Over the next several years, wireless carriers and equipment vendors are
        planning to build so-called third generation, or 3G, networks, which
        promise to transmit data at much higher speeds and offer more
        compatibility among devices. No matter how fast networks become, the
        need for low cost, secure and reliable data transmission will continue.
        We have designed our AIM software platform to grow with the capabilities
        of wireless networks. For example, we are currently working with U.S.
        and European wireless network carriers to develop our financial trading
        services to operate over networks using General Packet Radio Services,
        known as GPRS, a new high-speed wireless network standard being deployed
        in some U.S. markets and abroad.

     Issue:  Corporate managers require rigorous security standards when
             entrusting their data to third parties.

     Solution:  We provide a secure network operations center.

        Our network operations center has numerous duplicate-or
        redundant-elements and serves as a high-security physical link between
        data feeds from our business customers' and others' data systems and
        wireless carrier networks. This relieves corporations from the burden of
        constructing similar facilities. We believe our network operations
        center is capable of meeting the security standards for services we
        developed or are developing for Reuters, Discover Brokerage, the Chicago
        Board of Trade and Charles Schwab. We believe that our network
        operations center is a vital component of our wireless data service
        offerings and differentiates us from our competitors.

     Issue:  Corporate information technology managers are reluctant to
             configure and maintain inventories of wireless devices and provide
             ongoing customer support.

     Solution:  We provide product fulfillment and customer service.

        We send end users fully functioning mobile devices configured for the
        wireless data networks and applications they will use. We also have a
        customer service center providing ongoing end user support. Companies do
        not have to worry about configuring devices for use by their employees
        and customers, fixing broken units, handling warranties or answering
        questions from users.

THE AETHER STRATEGY

     Our strategy is to be the dominant provider of wireless data services and
systems by using our engineering expertise, our AIM software platform, our
customer service and network operations center and our other resources to offer
businesses complete systems for wireless data communications and transactions.
We seek to maximize recurring revenue initially by extending online trading and
financial information services to wireless handheld devices. We also

                                       32
<PAGE>   33

plan to enter new markets by licensing our AIM software platform to other
industries and by developing broader mass-market applications and services
through OpenSky. Our strategy includes the following key elements:

     Develop the market for existing and new products in the financial services
sector.  Our initial strategy is to tap into major segments of the financial
services industry, whose participants we believe are among the earliest adopters
of wireless data services. We focus on two types of financial services
subscribers, individual investors and market professionals, who understand the
value of receiving real-time information and trading capabilities. We believe
the same factors that fuel interest in online trading-easy access to accounts
and real-time market information and do-it-yourself buying and selling-will lead
investors to want wireless access to the same capabilities. In addition, we plan
to enhance the services offered by Mobeo by integrating Mobeo's software with
our AIM software platform. This will provide Mobeo subscribers with two-way
capabilities and access to additional financial information.

     Expand into new industries and international markets.  We believe that we
can apply our wireless experience and resources to other industries. For
example, transportation and health care companies, government workers and mobile
sales and repair forces could realize cost benefits and productivity gains
through wireless access to in-house data, e-mail and the Internet. Initially, we
will target new industries by licensing our AIM software platform to software
developers that want to integrate it with their software products and to
companies with extensive data needs and mobile workforces. We are also in
discussions with potential partners to expand into international markets.

     Pursue mass-market opportunities, including wireless Internet access,
e-mail and Internet and other electronic transactions.  OpenSky, a company we
recently formed with 3Com, is developing wireless Internet access, e-mail and
Internet and other electronic transaction services that address opportunities in
the emerging consumer and business mass markets. We have a 26% equity interest
in OpenSky on a fully diluted basis. We have a letter agreement with OpenSky to
provide engineering services for the design and development of OpenSky's
proposed systems and services, and OpenSky has a royalty-free license to use our
AIM software platform. Additionally, we have a two-year right of first refusal
to design and develop custom systems and applications for all services relating
to investment banking and brokerage activities. We also have the right to bundle
OpenSky services for a period of five years, as an added feature to the other
services we offer.

     Expand our customer base and strengthen the Aether brand through enhanced
sales and marketing efforts.  We intend to increase our sales and marketing
expenditures significantly to both increase our direct sales force and promote
the Aether brand. To build on our early success in the financial services
industry, we intend to build our sales force focused on financial institutions,
and we will also target companies that want to provide wireless access to their
data applications. We are also starting up a sales effort to market our AIM
software platform by targeting large corporations in other industries that both
invest heavily in technology and have significant numbers of mobile customers or
employees. In addition, we will continue to build relationships with third party
software developers who wish to use our AIM software platform to provide their
applications with wireless capabilities. Our branding efforts will include
advertising, public relations, speaking engagements and sponsorship of major
conferences.

     Maintain and strengthen our strategic relationships with suppliers and
customers.  A key to our ability to provide complete wireless data services to
our customers is our relationships with wireless network carriers and
manufacturers of wireless devices. These relationships take time to develop,
providing us with an advantage getting our services to market before our
competitors. We intend to maintain and strengthen these relationships by
negotiating more cost-effective rate plans with existing wireless network
carriers, testing our wireless services with providers of next-generation
high-speed wireless networks and working with manufacturers and industry forums
to guide development of new devices and applications.

     Use the expertise we gain by providing engineering services to develop new
Aether products.  The engineering services we provide our customers play an
important role in our product development strategy. While we no longer provide
engineering services strictly to generate revenue, we do take on engineering
assignments that might allow us to expand into new geographical markets or
industry sectors or to provide new services, in particular by introducing us to
new technologies. Examples of new services might include enhanced e-mail and
Web-browsing, wireless database search and retrieval, alerts based on the
occurrence of an event specified by the user, instant messaging and electronic
gaming.

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<PAGE>   34

     Pursue selective acquisitions to expand our capabilities.  We intend to
pursue acquisitions that we believe would allow us to increase quickly the scale
and scope of our resources, such as expanding our engineering force, to expand
into new geographical markets or industry sectors or to provide new services.

SERVICES

     The services we currently offer or are developing include:

     - delivering real-time wireless financial market information and trading
       capabilities;

     - licensing our AIM software platform to corporations seeking to add
       wireless data capabilities; and

     - providing engineering services for the design, development and support of
       wireless data systems.

The following table sets forth summary information regarding our services.

WIRELESS FINANCIAL INFORMATION AND TRADING SERVICES

<TABLE>
<CAPTION>
EXISTING SERVICES            USERS OF SERVICE      DATE INTRODUCED      REVENUE TYPE       SERVICE DESCRIPTION
- ---------------------------  --------------------  -------------------  -----------------  ------------------------------
<S>                          <C>                   <C>                  <C>                <C>
  Reuters MarketClip         Individual investors  March 1998           Monthly recurring  Market quotes, news and alerts
  PitViper                   Chicago Board of      July 1999 (Trial     Monthly recurring  Trade recording, commodities
                             Trade floor traders   began)                                  quotes, news and alerts
  TradeRunner                Discover Brokerage's  August 1999          Monthly recurring  Equities and options trading,
                             online investors                                              market quotes, news and alerts
  Mobeo FX Alert             Financial market      September 1999       Monthly recurring  Foreign exchange, quotes, news
                             professionals                                                 and alerts
</TABLE>

<TABLE>
<CAPTION>
        SERVICES UNDER DEVELOPMENT          USERS OF SERVICE    REVENUE TYPE           SERVICE DESCRIPTION
- ------------------------------------------  ----------------  -----------------  --------------------------------
<S>                                         <C>               <C>                <C>
Trading and information for Charles Schwab  Charles Schwab's  Monthly recurring  Equities and options trading,
 customers                                  online investors                     market quotes, news and alerts
Trading and information for Bear Stearns    Brokers of firms  Monthly recurring  Customer account access and
 clearing customers                         clearing through                     trading, market quotes, news and
                                            Bear Stearns                         alerts
</TABLE>

AIM LICENSING

<TABLE>
<CAPTION>
CUSTOMER                 DATE OF CONTRACT   REVENUE TYPE      CUSTOMER'S USE OF AIM
- -----------------------  -----------------  ----------------  ---------------------------------------------------
<S>                      <C>                <C>               <C>
  Riverbed Technologies  August 1999        Up front and per  Develop software for wireless update of handheld
                                            user licensing    devices to desktop computers
                                            fees
</TABLE>

<TABLE>
<CAPTION>
ENGINEERING SERVICES
                         CUSTOMER'S TARGET
CUSTOMER                 MARKET             DATE OF CONTRACT  REVENUE TYPE       SERVICE DESCRIPTION
- -----------------------  -----------------  ----------------  -----------------  --------------------------------
<S>                      <C>                <C>               <C>                <C>
  ORBCOMM                Transportation     September 1998    Engineering fees   Develop location-tracking
                         industry                                                capabilities for towing firms
  Ericsson               Industries         July 1999         Marketing support  Develop financial data services
                         needing real-time                    and engineering    using two-way pagers
                         information                          fees
  OpenSky                Consumer and       August 1999       Engineering fees   Develop Internet access, e-mail
                         business mass                                           and capabilities to conduct
                         market                                                  transactions on wireless
                                                                                 handheld devices
</TABLE>

  Wireless Financial Information and Trading Services

     Our wireless financial information and trading services and customers are
described below.

                                       34
<PAGE>   35

     - Reuters MarketClip.  In March 1998, we introduced the Reuters MarketClip
       service, which delivers news stories, real-time financial market price
       quotes, historical graphs and stock alerts from Reuters to Palm and
       Windows CE devices. We charge individual subscribers a flat monthly fee
       for unlimited usage of this service in addition to the fees charged by
       the securities exchanges and markets for the right to view real-time
       price quotes. Based on our records, each MarketClip customer sends an
       average of 110 queries per day. The service operates using the wireless
       network systems known as CDPD and Mobitex. These networks cover
       geographic areas that enable us to provide service to more than 90% of
       the U.S. population. We also continue to support AirBroker, a predecessor
       to Reuters MarketClip that provides market information using mobile
       phones.

     - Chicago Board of Trade.  In June 1999, we began a limited trial of a
       wireless trade recording system, PitViper, for the Chicago Board of
       Trade. This trial allows up to 15 users of Palm devices to track and
       record trades executed on the floor. Once a trade is entered on PitViper,
       the terms of the trade are transmitted to Chicago Board of Trade's trade
       confirmation system. Traders can also access real-time price quotes for
       commodities and futures as well as news stories. We expect that the
       Chicago Board of Trade will make PitViper available to the approximately
       3,500 Chicago Board of Trade floor traders if the trial succeeds. We
       intend to charge individual subscribers a flat monthly fee for the
       service.

     - Discover Brokerage TradeRunner.  In August 1999, we launched TradeRunner,
       a new service that allows Discover Brokerage's online customers to trade
       stocks, mutual funds and options using Palm devices. In addition,
       subscribers receive news stories, real-time financial market price
       quotes, historical graphs and stock alerts from Reuters. We charge
       Discover Brokerage account holders who subscribe to this service a flat
       monthly fee for unlimited usage, in addition to the fees charged by the
       securities exchanges and markets for the right to view real-time price
       quotes. Users pay Discover Brokerage's regular commission fees for any
       trades. Discover Brokerage is marketing and advertising TradeRunner
       through radio, print media and its Web site, and we are marketing the
       service through our Web site as well. We support TradeRunner through our
       customer service and network operations center. The service operates
       using CDPD or Mobitex networks. We are currently developing a market
       trial for a similar service with Charles Schwab. We are developing the
       system with Schwab based on a binding preliminary agreement and are
       negotiating a definitive agreement. Under the preliminary agreement, we
       have agreed that we or our business partners will spend at least $500,000
       (and match up to an additional $500,000 spent by Schwab) on advertising
       and marketing this service, and we will provide engineering support to
       implement Schwab's service for no charge for two years. We cannot assure
       you that we will sign a definitive agreement. We are also in discussions
       with other brokerage firms to develop similar services.

     - Bear Stearns.  We are working with Bear Stearns to develop wireless
       trading applications for the brokers and other market professionals of
       firms that clear their trades through Bear Stearns. Using handheld
       devices, subscribers will be able to access information and capabilities
       similar to the Bear Stearns applications that reside on their desktop
       computers. Firms who clear trades through Bear Stearns or their market
       professionals will pay us a flat monthly per user fee for unlimited
       usage. We began to develop the system for Bear Stearns after signing a
       letter of intent with them in March 1999, but neither we nor Bear Stearns
       has any obligation to the other until a definitive agreement is signed.
       We cannot assure you that a definitive agreement will be signed.

     - Mobeo services.  As a result of the Mobeo acquisition, we offer and plan
       to enhance Mobeo's financial information services. These services
       supplement our own by providing additional data relating primarily to the
       foreign exchange and selected commodities markets. Mobeo delivers
       time-sensitive financial information from Bridge Information Systems
       America, Inc. and its subsidiary Telerate, Inc. over wireless networks
       that reach the largest 100 metropolitan markets in the United States.
       Mobeo currently offers five services, each operating on pagers. Its
       flagship service is F/X Alert, a real-time price quote, news and alert
       service tracking more than 150 financial instruments including foreign
       exchange, fixed income, futures/derivatives and commodities. Other
       services called Scrappy, Energy and Pocket Futures track the scrap
       metals, energy and futures markets, respectively. Early in 1999, Mobeo
       began marketing Mobeo 1.0, a two-way financial market price quotes and
       information service, similar to MarketClip, that operates using the RIM
       950 two-way pager.

                                       35
<PAGE>   36

  Licensing the AIM Software Platform

     Aether Intelligent Messaging, or AIM, is a package of wireless messaging
software and development tools-or software platform-that facilitates the
development of wireless data systems. We developed the AIM software platform in
1997 to improve the performance of data delivery over wireless networks and to
provide a development kit to speed the software development process. We use the
AIM software platform internally to develop and support wireless data services,
such as TradeRunner and PitViper. We recently launched a program to license the
AIM software platform to both software developers and large corporations.
Software developers can integrate the AIM software platform with their
applications to provide those applications with a wireless capability. When the
AIM-based application is sold, we can then earn one-time revenue from per-user
license fees or recurring revenue if the application is run from our network
operations center. Similarly, corporate customers who develop AIM-based
applications for their own use can pay us license fees per user or recurring
services fees if we host the application.

     How the AIM Software Platform Works.  The diagram below illustrates how the
AIM software platform works to integrate sources of data with wireless networks
and devices. Data and applications come from internal corporate systems, such as
those at Discover Brokerage, from public data sources via the Internet or from
proprietary systems such as Reuters Selectfeed Plus. The AIM software platform
then takes the data, replaces unnecessary or repetitive message-header
information with more streamlined tags, compresses and encrypts it so the data
can move quickly and securely outside the security system (or "firewall")
controlling access to and from the source's network and then sends it over the
airwaves using any of a number of wireless networks to the intended device. Not
all devices will work on all wireless carrier networks. Our AIM software
platform can be configured to support other networks as they are developed and
as customer needs require.

                           [HOW AIM WORKS FLOW CHART]

     The AIM software platform has the following features and benefits.

     - The AIM software platform enhances the speed, efficiency and security of
       data transmission over wireless networks.  The AIM software platform
       trims unnecessary electronic message tags and compresses data, with

                                       36
<PAGE>   37

       no loss in the reliability of message delivery. As a result, users get
       data quickly and at low cost. The AIM software platform uses a
       sophisticated technology known as elliptic curve cryptography, or ECC,
       which was developed by Certicom Corp., to encode the data so it cannot be
       read by a third party that intercepts the data.

     - The AIM software platform simplifies programming required to convert data
       into a form that can be transmitted over wireless networks.  The AIM
       software platform uses industry-standard programming languages and
       includes application program interfaces. The AIM software platform comes
       with a software development kit that provides programmers step-by-step
       guides and automatically generates code for major system components based
       on the options selected. As a result, programmers can focus on the
       business objectives the system is designed to meet, rather than becoming
       immersed in unfamiliar and complex software and wireless network
       protocols.

     - The AIM software platform facilitates the interaction of major operating
       systems on which most corporate applications run with the most widely
       used wireless data networks and devices. To date, the AIM software
       platform is compatible with the following wireless network carrier
       protocols, mobile device operating systems and corporate operating
       systems:

        - wireless network carrier protocols: CDPD, Mobitex and ReFlex, a
          two-way paging technology developed by Motorola;

        - mobile device operating systems: Palm computing platform, Windows CE,
          two-way pagers, mobile phones and Windows 95/98/NT and their
          corresponding modems; and

        - corporate operating systems: Windows NT, UNIX, Linux and most
          mainframe operating systems.

       As a result, our business customers can offer a wide variety of
       applications for wireless transmission, and end users can similarly
       choose from a number of devices. Our engineers continually develop the
       capabilities of the AIM software platform as new systems, protocols and
       devices emerge.

  Engineering Services

     We began operations in 1996 by providing engineering services to businesses
seeking to develop wireless data systems. Our customers have included the U.S.
Postal Service and Reuters Group Overseas Holding(UK) Limited. In addition,
Transettlements and Reuters accounted for 61.4% of our engineering services
revenue in 1998. Our engineers have experience in developing wireless
applications for a variety of businesses.

     Since 1998, we have focused our efforts more on developing wireless data
services-such as MarketClip and TradeRunner-that will result in recurring
subscription revenue to us. While we therefore no longer provide engineering
services strictly to generate revenue, we do take on assignments that might
allow us to expand into new geographical markets or industry sectors or to
provide new services, in particular by introducing us to new technologies. In
addition to our contract with OpenSky, our current engineering services clients
include a subsidiary of Ericsson and ORBCOMM. The work we will do for Ericsson
will help us to enhance two-way paging services for the financial services
industry. Through our work with ORBCOMM, we hope to develop new services for the
transportation industry. We generally charge our clients for engineering time on
an hourly basis or a per project flat fee.

OPERATIONS

  Engineering and Project Implementation

     Our most important operational resource is our engineering staff. This
staff includes wireless systems engineers, software engineers who specialize in
developing applications for handheld devices and engineers who specialize in
systems integration and testing. We have steadily built our engineering ranks,
more than doubling the number from ten in 1998 to 27 in September 1999. Our
engineers have, on average, more than ten years of experience in the wireless
data industry. Many come from engineering departments at established companies,
including IBM, Westinghouse Electric Corporation and UPS/Roadnet. Mobeo
currently has one engineer and outsourcing relationships with several
engineering firms.

                                       37
<PAGE>   38

     Project implementation is critical to the effective delivery of services to
our customers. Projects generally consist of the following phases: project
definition, development, pilot testing, quality assurance and launch. Each
project has a project manager who works closely with the customer and
coordinates our engineers and our operations and marketing personnel through all
phases of the project. Our operations staff prepares documentation and training
manuals. During the product launch phase, we send operations teams to train
customer personnel on product use and support. Our marketing department works
closely with customers before commercial launch to coordinate advertising and
publicity.

  Technology and Network Operations

     We operate a secure network operations center at our headquarters in Owings
Mills, Maryland. We believe that this center is a vital component of our
wireless data service offerings and differentiates us from our competitors. By
outsourcing to us, our customers are relieved of the technology and operations
burden of managing a highly complex wireless data system. From our network
operations center, we maintain high speed data transmission lines (known as T1
connections) both to our customers' data sources and to the wireless data
networks we use. The center is equipped with Cisco and Hewlett-Packard
networking equipment, Sun Sparc UNIX servers and high-end clustered NT servers.
In the event of a catastrophic power failure, there is a diesel-powered
generator that is serviced on a weekly basis. We believe our network operations
center is capable of meeting the security standards for services we developed or
are developing for Reuters, Discover Brokerage, the Chicago Board of Trade and
Charles Schwab. We are planning to establish a remote backup facility in early
2000 to provide additional redundancy. The center is staffed from 8:00 a.m. to
8:00 p.m. Eastern time on weekdays and is monitored 24 hours a day, seven days a
week.

  Sales and Marketing

     We currently market our products and services to the following customer
types: individual investors, financial market professionals and corporations.
For our financial market services, we seek to involve other parties, including
our corporate customers, in our marketing activities, as has been the case with
Reuters, AT&T Wireless Services and Discover Brokerage. As of September 30,
1999, we had eight sales and marketing professionals. We intend to grow this
number significantly in the next 12 months. Our business development personnel
and senior executives, particularly our chief executive officer and chief
operating officer, also spend a considerable amount of time developing potential
customer relationships and selling and promoting our services. With the proceeds
from this offering, we are planning to make a significant investment in building
the Aether brand. Our target customer segments, the services we sell to them and
how we reach them are described below.

     - Individual investors.  We believe individual investors are the primary
       subscribers to our wireless financial information and trading services,
       such as MarketClip and TradeRunner. As of August 31, 1999, we had 934
       subscribers to MarketClip and an additional 50 subscribers to its
       predecessor, AirBroker. Print advertising in finance-related publications
       is our primary means of marketing these services. Our strategy is to
       share marketing and advertising costs with our strategic partners and
       corporate customers associated with particular services. For example,
       AT&T Wireless Services, which benefits from increased usage of its
       wireless data network, has shared with Aether the cost of advertising for
       MarketClip. Ericsson has agreed to join the marketing campaign for
       MarketClip beginning in the fall of 1999. Discover Brokerage, which
       benefits from an enhanced service offering and increased customer trading
       activity, pays for all of the advertising of TradeRunner. Our wireless
       financial information and trading services are also marketed to
       individual investors at financial services industry trade shows and on
       the Web sites of Aether, Discover Brokerage and Reuters. Our customer
       service center handles in-bound calls generated from these marketing
       efforts and signs up new subscribers.

     - Financial market professionals.  We seek to develop relationships with
       financial institutions, whose market professionals become the end users
       of our services. We are currently developing wireless trade recording
       applications for Chicago Board of Trade floor traders and wireless
       trading applications for Bear Stearns's trade clearing clients. After we
       complete the Mobeo acquisition, we will also provide Mobeo's wireless
       foreign exchange information services, which are primarily used by
       financial market professionals. As of August 1999, Mobeo had more than
       3,110 subscribers for its services. Mobeo markets its products through
       four direct sales executives in New York and Chicago and through
       occasional advertising in financial trade publications.

                                       38
<PAGE>   39

     - AIM software platform licensees.  We are accelerating our efforts to
       market the AIM software platform to new industries. To date, we have
       licensed the AIM software platform to Riverbed Technologies, a leading
       developer of software tools for wireless handheld devices. We have also
       established relationships with Microsoft, Oracle Corporation, Sybase Inc.
       and Lotus Development Corporation to integrate the AIM software platform
       with their software products and will work to develop similar
       relationships with other software developers. We are targeting our direct
       sales effort at large corporations with a significant mobile workforce
       who wish to develop their own wireless applications.

     - Engineering services clients.  As part of our business development
       effort, we seek out engineering assignments that might allow us to expand
       into new geographical markets or industry sectors or to provide new
       services, in particular by introducing us to new technologies.

  Product Fulfillment, Customer Service and Billing

     We provide product fulfillment, customer service and billing at our
customer service center, located at our headquarters. We maintain a modest
inventory of mobile devices and wireless modems, which we buy in bulk from
manufacturers and resellers. Our customer service representatives first verify
that a potential subscriber will have wireless network coverage where they plan
to use the service. For qualified subscribers, we load and configure custom
software on mobile devices, activate wireless modems and perform quality
assurance checks. We then pack, ship and track the product until the subscriber
receives it. For end users who already own a device, we provide only the modem
and software application. We handle all repair and warranty issues for devices
we provide to our subscribers.

     We employ nine permanent and three temporary customer service
representatives, most of whom are college educated. We train our customer
service representatives to handle inquiries about our services, device features
and wireless communications. Our customer service personnel are available from
8:30 a.m. until 8:00 p.m. Eastern time. We plan to expand our customer service
center during the fourth quarter of 1999.

     We handle customer billing for all subscription fees, devices and modems,
securities exchange and market charges and other fees. We bill monthly for
subscriber services, which subscribers must pay by credit card. As a result, our
billing system can support increases in our subscriber base. We intend to
enhance our billing capabilities as our needs grow.

STRATEGIC RELATIONSHIPS

     A key to our ability to provide complete wireless data services to our
customers is our relationships with wireless network carriers and manufacturers
of mobile devices. These relationships take time to develop, and we therefore
believe they provide us with an advantage getting our services to market before
our competitors. We maintain the strategic relationships described below.

  Wireless Network Carriers

     We believe our relationships with wireless network carriers are mutually
beneficial. We believe we are among the largest buyers of wireless data network
capacity for many of the carriers we use. As a result, we are able to negotiate
favorable rates. Typically, we have one-year contracts to buy data network
capacity either for an agreed amount of kilobytes at a flat fee or on a
cents-per-kilobyte basis. We have contracts with AT&T Wireless Services, Bell
Atlantic Mobile, BellSouth Wireless Data and Ameritech. As a result, we can give
our customers a wide variety of wireless carrier choices.

  Mobile Device Manufacturers

     Our services increase the usefulness of wireless handheld devices, and we
believe our services will increase sales of these devices. Mobile device
manufacturers have therefore assisted us in various projects we have undertaken.
We have worked closely with 3Com, an Aether investor, on the development of our
wireless applications for the Palm personal organizer. In late 1998, 3Com's
investment helped us fund construction of our customer service and network
operations center. In August 1999, a subsidiary of Ericsson, one of the largest
manufacturers of wireless phones, agreed to assist us in marketing MarketClip
and in developing and marketing other financial information services.

                                       39
<PAGE>   40

Ericsson is also assisting us in developing services using WAP phones and
next-generation high-speed GPRS data networks. We participate in industry
development groups dedicated to bringing new applications to wireless data, such
as the Palm developers group, the WAP Forum and the Windows CE developers forum.

  Financial Content Providers

     Financial content providers supply Aether with real-time financial
information, which we provide to our wireless data subscribers. Reuters which is
an Aether investor, is our primary provider of financial information and market
data for MarketClip and TradeRunner. We have a license to use information from
Reuters with an initial term extending through August 2001, and the term
automatically extends each year after that unless we or Reuters decide to end
the license. After we complete the Mobeo acquisition, we expect to continue
Mobeo's relationship with Bridge Information Systems America, Inc., another
financial content provider, and its subsidiary Telerate, Inc. We have agreements
with the New York Stock Exchange, the Nasdaq Stock Market, Inc., the Chicago
Board of Trade and the Options Price Reporting Authority that authorize us to
provide real-time price quotes.

OPENSKY

     In August 1999, we formed a new company called OpenSky with 3Com. We formed
OpenSky to pursue opportunities in the emerging consumer and business mass
markets for wireless Internet access, e-mail and Internet and other electronic
transaction applications. OpenSky's main business objectives and strategies
include those set forth below.

     - OpenSky will seek to develop a package of applications and services that
       includes a selection of Web sites that have been customized for access
       via wireless handheld devices, general Web browsing, access to a user's
       existing e-mail account and selected Internet and electronic transaction
       services.

     - OpenSky intends to co-market this package with wireless network carriers
       and Internet content providers in order to benefit from their brand
       recognition and marketing channels. OpenSky may also seek to bundle its
       service package with devices that are distributed by major national
       computer retailers.

     - OpenSky will seek to develop services that can access all platforms and
       devices, rather than committing to a single device or network protocol.

     We have a 26% equity interest in OpenSky on a fully diluted basis in the
form of 7,000,000 shares of preferred stock. We also have a warrant to buy up to
an additional 3,000,000 shares of preferred stock for an aggregate exercise
price of $2.5 million, which would give us up to a 33% interest in OpenSky on a
fully diluted basis. We can exercise the warrant until 15 days after we complete
this offering unless the offering is not completed by January 31, 2000 or
OpenSky conducts a public offering or is bought by a third party before our
offering is completed. We have a letter agreement with OpenSky to provide
engineering services through June 2000 for the design and development of
OpenSky's proposed system and services, and OpenSky has a perpetual royalty-free
license to use our AIM software platform. Additionally, we have a two-year right
of first refusal to design and develop custom systems and applications for all
services relating to investment banking and brokerage activities. We also have
the right to bundle OpenSky services for a period of five years as an added
feature to the other services we offer. We describe the details of our interest
in OpenSky in "Transactions Between Aether and Its Officers, Directors and
Significant Shareholders-OpenSky" on page 57.

     Our chairman, chief executive officer and president, David S. Oros, is a
member of the OpenSky board of directors. Patrick McVeigh, former vice president
of worldwide sales for the Palm Computing division of 3Com, serves as president
and chief executive officer of OpenSky and also serves on the OpenSky board of
directors. OpenSky is based in Palo Alto, California.

MOBEO ACQUISITION

     On September 28, 1999, we acquired all of the common stock of Mobeo, Inc.
for a purchase price of $11.7 million in cash, plus Aether options to acquire
18,442 units (equivalent to 46,105 shares) in exchange for existing Mobeo
options. The purchase price includes Mobeo's broker's fees and commissions, but
did not include our transaction costs of approximately $150,000. All options to
acquire shares of Mobeo's common stock were cancelled prior to closing. We
issued Aether options in lieu of cash to three of the four holders of Mobeo
options in

                                       40
<PAGE>   41

consideration for those three holders cancelling their Mobeo options. The
exercise price for these options is $12.00 per unit (equivalent to $4.80 per
share) and they are exercisable immediately and until September 2009. We paid
the other holder of Mobeo options cash in consideration for cancelling his Mobeo
options.

     As a result of the Mobeo acquisition, we have gained 21 additional
employees. All three of the selling stockholders have entered into non-compete
agreements as a condition to closing. Additionally, two of the selling
stockholders have entered into advisory services agreements under which they
received options for an aggregate of 125,000 units (equivalent to 312,500
shares), and one of the selling stockholders has entered into an employment
agreement under which he received an option for 26,000 units (equivalent to
65,000 shares). The exercise price of options for 125,000 units (equivalent to
312,000 shares) is $15.00 per unit (equivalent to $6.00 per share) and the
options are exercisable immediately and until 18 months after this offering is
completed. The exercise price of options for 14,000 of the remaining units
(equivalent to 35,000 shares) is $12.00 per unit (equivalent to $4.80 per share)
and the exercise price of options for the remaining 12,000 units (equivalent to
30,000 shares) is $6.00 per unit (equivalent to $2.40 per share). The options
for these 26,000 units (equivalent to 65,000 shares) are exercisable from
September 2001 until September 2009. All three of the selling stockholders have
agreed to indemnify and hold Aether (including without limitation its officers,
directors, stockholders and affiliates) harmless for all liabilities, losses and
claims (including third party claims) resulting from a breach of the
representations, warranties and covenants contained in the definitive agreement.
Additionally, the three selling stockholders have agreed to waive any right of
contribution or indemnification against Mobeo. Finally, we granted options to
acquire 26,000 units (equivalent to 65,000 shares) to existing Mobeo employees.
The exercise price of options for 14,000 units (equivalent to 35,000 shares) is
$12.00 per unit (equivalent to $4.80 per share) and the exercise price for
12,000 units (equivalent to 30,000 shares) is $6.00 per share (equivalent to
$2.40 per share). Each of these options is exercisable from September 2001 until
September 2009.

COMPETITION

     The market for our services is becoming increasingly competitive. We
believe we offer the broadest range of services to businesses necessary to
enable the development, offering and ongoing support of wireless data
communication systems for their employees or customers. The widespread adoption
of industry standards may make it easier for new market entrants to offer some
or all of the services we offer and may make it easier for existing competitors
to introduce some or all of the services they do not now provide, or improve the
quality of their services. We expect that we will compete primarily on the basis
of the functionality, breadth, quality and price of our services. Our current
and potential competitors include:

     - Wireless financial services providers, including W-Trade and EmailPager,
       Inc.;

     - Wireless data services providers, such as Wireless Knowledge, a joint
       venture of Microsoft and Qualcomm Incorporated, Research In Motion, Go
       America and Saraide.com;

     - Wireless communications software companies, including Phone.com, Nettech
       Systems Inc., Dynamic Mobile Data and 724 Solutions Inc.;

     - Wireless systems integrators, such as IBM, ApiON Ltd., and GTE
       Corporation; and

     - Wireless network carriers, such as AT&T Wireless Services, Bell Atlantic
       Mobile, Sprint PCS, Nextel Communications, Inc. and Metricom, Inc.

     Many of our existing and potential competitors have substantially greater
financial, technical, marketing and distribution resources than we do.
Additionally, many of these companies have greater name recognition and more
established relationships with our target customers. Furthermore, these
competitors may be able to adopt more aggressive pricing policies and offer
customers more attractive terms than we can.

     Notwithstanding the increasing competitiveness of our market, we believe
that our potential competitors face substantial barriers to market entry.
Development of wireless data systems comparable to those we have already
developed is time consuming and costly. Moreover, the engineering talent
necessary to develop such systems is scarce.

INTELLECTUAL PROPERTY RIGHTS

     We own applications for federal registration or common law rights in the
following trademarks: AirBroker(R), Aether Technologies(TM), Aether(TM) and our
logo. Reuters and Reuters MarketClip(TM) are the property of Reuters Group plc.
Discover Brokerage TradeRunner(TM) is the property of Discover Brokerage. This
prospectus also includes trade
                                       41
<PAGE>   42

dress, trade names and trademarks of other companies. All other brand names or
trademarks appearing in this prospectus are the property of their respective
holders.

     We rely on a combination of copyright, trademark, service mark, trade
secret laws and contractual restrictions to establish and protect certain
proprietary rights in our services. Mobeo has applied for two patents for its
technology. Specifically, one patent application covers the method and system
for providing formatted information via a two-way communication system. The
other patent application covers the method and system for providing localized
information.

     We do not have any federal trademark registrations in the name "Aether" or
"AIM" and we may not be able to obtain such registrations due to conflicting
marks or otherwise. The steps taken by us to protect our intellectual property
may not prove sufficient to prevent misappropriation of our technology or to
deter independent third-party development of similar technologies. The laws of
certain foreign countries may not protect our services or intellectual property
rights to the same extent, as do the laws of the United States. We also rely on
certain technologies that we and Mobeo license from third parties including data
feeds and related software from Reuters Select Feed Plus and Bridge Information
Services, synchronization technology from Riverbed Technologies and encoding
technology from Certicom. These third-party technology licenses may not continue
to be available to us on commercially attractive terms. The loss of the ability
to use such technology could require us to obtain the rights to use substitute
technology, which could be more expensive or offer lower quality or performance,
and therefore have a material adverse effect on our business, financial
condition or results of operations.

     Third parties could claim infringement by us with respect to current or
future services. We expect that participants in our markets will be increasingly
subject to infringement claims as the number of services and competitors in our
industry segment grows. Any such claim, whether meritorious or not, could be
time-consuming, result in costly litigation, cause service installation delays
or require us to enter into royalty or licensing agreements. Such royalty or
licensing agreements might not be available on terms acceptable to us or at all.
As a result, any such claim could have a material adverse effect upon our
business, financial condition or results of operations.

GOVERNMENT REGULATION

     We are not currently subject to direct federal, state or local government
regulation, other than regulations that apply to businesses generally. The
wireless network carriers we contract with to provide airtime are subject to
regulation by the Federal Communications Commission. Changes in FCC regulations
could affect the availability of wireless coverage these carriers are willing or
able to sell to us. We or OpenSky could also be adversely affected by
developments in regulations that govern or may in the future govern the
Internet, the allocation of radio frequencies or the placement of cellular
towers. Regulations of the SEC governing online trading could reduce the level
of online trading or the demand for wireless financial information. Also,
changes in these regulations could create uncertainty in the marketplace that
could reduce demand for our services or increase the cost of doing business as a
result of costs of litigation or increased service delivery cost or could in
some other manner have a material adverse effect on our business, financial
condition or results of operations.

     We currently do not collect sales or other taxes with respect to the sale
of services or products in states and countries where we believe we are not
required to do so. We do collect sales and other taxes in the states we have
offices and are required by law to do so. One or more jurisdictions have sought
to impose sales or other tax obligations on companies that engage in online
commerce within their jurisdictions. A successful assertion by one or more
jurisdictions that we should collect sales or other taxes on our products and
services, or remit payment of sales or other taxes for prior periods, could have
a material adverse effect on our business, financial condition or results of
operations.

     Any new legislation or regulation, or the application of laws or
regulations from jurisdictions whose laws do not currently apply to our
business, could have an adverse effect on our business.

FACILITIES

     Our principal offices are located in Owings Mills, Maryland in a 15,436
square foot facility under a lease expiring in February 2004, with no renewal
option. We also lease space for our offices in Boca Raton, Florida and New York,
New York.

                                       42
<PAGE>   43

     As a result of the Mobeo acquisition, we have an additional 6,000 square
feet of office space in Bethesda, Maryland, New York, New York and Chevy Chase,
Maryland. These leases expire at different times ranging from November 30, 1999
to December 31, 2004. We will also have month-to-month leases for executive
apartments in Chicago, Illinois and in Bethesda, Maryland.

EMPLOYEES

     As of October 1, 1999, we had a total of 83 employees, 62 from Aether and
21 from Mobeo, and 27 of these employees were engineers. None of our employees
is covered by a collective bargaining agreement. We believe that our relations
with our employees are good.

LEGAL PROCEEDINGS

     We are not currently subject to any material legal proceedings. However, we
may from time to time become a party to various legal proceedings arising in the
ordinary course of our business.

                                       43
<PAGE>   44

                                   MANAGEMENT

EXECUTIVE OFFICERS, DIRECTORS AND KEY EMPLOYEES

     At the time the offering is completed, our executive officers, directors
and nominees for director, and key employees and their ages and position with us
will be as follows:

<TABLE>
<CAPTION>
                NAME                   AGE                           POSITION
                ----                   ---                           --------
<S>                                    <C>   <C>
EXECUTIVE OFFICERS AND DIRECTORS:
David S. Oros........................  40    Chairman, Chief Executive Officer and President
George M. Davis......................  43    Chief Operating Officer
David C. Reymann.....................  41    Chief Financial Officer
Brian W. Keane.......................  41    Senior Vice President, Strategic Development
Dale R. Shelton......................  38    Senior Vice President, Engineering
J. Carter Beese, Jr. ................  43    Director
Frank A. Bonsal, Jr. ................  62    Director
Mark D. Ein..........................  34    Director
Rahul C. Prakash.....................  38    Director
Janice M. Roberts....................  43    Director
Dr. Rajendra Singh...................  43    Director
George P. Stamas.....................  48    Director
Devin N. Wenig.......................  32    Director
Thomas E. Wheeler....................  53    Director
KEY EMPLOYEES:
David J. Bressler....................  31    Vice President, AIM Sales and Marketing
Calvin A. Cassidy....................  42    Vice President, Enterprise Systems and Solutions
John Clarke..........................  36    Vice President, Operations
William F. Davidson..................  34    Senior Vice President, Sales
Andrew S. Meister....................  36    Vice President, Technical Sales
Gregory S. Milbank...................  40    Vice President, Business Development
Michael B. Mills.....................  38    Vice President, Business Development
</TABLE>

     On October 20, 1999, Messrs. Beese, Bonsal, Ein, Prakash, Wenig and
Wheeler, Dr. Singh and Ms. Roberts were elected directors of Aether Systems,
Inc.

     David S. Oros founded Aether in 1996 and has been our chairman, chief
executive officer and president since Aether's inception. Mr. Oros also serves
on the board of directors of OpenSky. From 1994 until 1996, Mr. Oros was
president of NexGen Technologies, L.L.C., a wireless software development
company that contributed all of its assets to Aether. From 1992 until 1994, he
was president of the Wireless Data Group at Westinghouse Electric. Prior to
that, Mr. Oros spent from 1982 until 1992 at Westinghouse Electric directing
internal research and managing large programs in advanced airborne radar design
and development. Mr. Oros received a B.S. in mathematics and physics from the
University of Maryland and holds a U.S. patent for a multi-function radar
system.

     George M. Davis has served as our chief operating officer since September
1997. He joined us in September 1996 as vice president, business development to
lead initiatives required to launch, maintain and develop business opportunities
for our services. From September 1994 until September 1996, Mr. Davis was
director, enterprise management systems at Northrop Grumman Corp. Prior to that
time, Mr. Davis spent more than 14 years at Westinghouse Electric where he
managed advanced military electronic development and production projects. He
received a B.S. in business and economics from Bethany College.

     David C. Reymann has served as our chief financial officer since joining us
in June 1998. Mr. Reymann is also responsible for our treasury management
services and human resources. Before joining us, Mr. Reymann was director of
finance and accounting for The Sweetheart Cup Company from June 1996 until May
1998, where he managed the

                                       44
<PAGE>   45

financial analysis department and the accounting operations for 11 North
American manufacturing plants. Prior to that, Mr. Reymann spent 12 years with
Procter & Gamble serving in several key finance, accounting and operations
positions. Prior to that, Mr. Reymann spent five years at Ernst & Young where he
most recently specialized in emerging growth companies. Mr. Reymann received a
B.S. in accounting from the University of Baltimore and is a certified public
accountant.

     Brian W. Keane has served as senior vice president, strategic development
since joining us in August 1999. Mr. Keane is responsible for our mergers and
acquisitions activities as well as the development of strategic relationships
and partnerships. From February 1998 until August 1999, Mr. Keane was chief
financial officer for Management Information Consulting, Inc., a technology
consulting company. Prior to that, Mr. Keane spent ten years as an investment
banker with Smith Barney Inc. Mr. Keane received an A.B. in history and
mathematics from Cornell University and an M.B.A. from Harvard Business School.

     Dale R. Shelton has served as our senior vice president, engineering since
he joined us in June 1996 to direct the development of AIM and our wireless data
services. From January 1994 until June 1996, Mr. Shelton served as the systems
development leader for flash-flood prediction systems at the National Weather
Service. From June 1992 until January 1994, Mr. Shelton was principal engineer
for ARINC, Inc., where he led the development of aviation tracking and
maintenance systems. He received a B.S. in computer science from the University
of Maryland.

     J. Carter Beese, Jr., has been a manager of our limited liability company
since June 1997 and was elected a director of Aether on October 20, 1999. Since
July 1998, Mr. Beese has served as president of Riggs Capital Partners, a
division of Riggs National Corp., where he oversees a $100 million venture
capital fund. From September 1997 until July 1998, he served as vice chairman of
the Global Banking Group of BT Alex. Brown. Prior to the merger of Bankers Trust
and Alex. Brown, Mr. Beese was chairman of Alex. Brown International from
November 1994 until September 1997. From February 1992 until November 1994, Mr.
Beese served as a commissioner of the U.S. Securities and Exchange Commission.
Mr. Beese serves as a senior advisor to the Center for Strategic and
International Studies, a non-partisan public policy think tank and is involved
in the World Economic Forum. He serves as a director on the boards of China.com;
Internet Securities, Inc., a company majority owned by Euromoney Institutional
Investor, Inc.; and Natural Solutions, Inc. Mr. Beese received a B.S. in
economics and political science from Rollins College.

     Frank A. Bonsal, Jr., has been a manager of our limited liability company
since May 1999 and was elected a director of Aether on October 20, 1999. Since
1978, Mr. Bonsal has been a founding partner of New Enterprise Associates, one
of the largest venture capital firms in the United States. Mr. Bonsal has
focused on the development of early stage companies. He currently serves as a
director on the boards of CARS, Inc., CORVIS Corp., Entevo Corp., Explore, Inc.,
GeneScreen, Inc. and Healthy Pet Inc. In addition, he is a special limited
partner of Amadeus Capital Partners, Boulder Venture, Novak Biddle, Trellis
Ventures and Windward Ventures. Mr. Bonsal received a B.A. in economics from
Princeton University.

     Mark D. Ein is a co-founder of Aether, has been a manager of our limited
liability company since October 1996 and was elected a director of Aether on
October 20, 1999. Mr. Ein is the founder and chief executive officer of
Rollingwood Capital Partners, a holding company that was established in
September 1999 to create, invest in and acquire technology and
telecommunications companies. From 1992 until September 1999, Mr. Ein was a
principal with The Carlyle Group, where he was responsible for many of its
telecommunications investment activities. Prior to joining Carlyle, Mr. Ein was
an associate with Brentwood Associates, where he worked on leveraged buyout and
venture capital investments. Prior to joining Brentwood Associates, he was an
analyst in the real estate department of Goldman, Sachs and Company. Mr. Ein
currently serves as a director on the boards of LCC International, Inc. and
several private companies. Mr. Ein received a B.S. in economics from the
University of Pennsylvania and an M.B.A. from Harvard Business School.

     Rahul C. Prakash has been a manager of our limited liability company since
February 1997 and was elected a director of Aether on October 20, 1999. Since
January 1997, Mr. Prakash has served as president of Telcom Ventures, L.L.C., a
wireless communications investment company. From January 1994 until December
1996, Mr. Prakash served as vice president, business development of Telcom
Ventures. Prior to that time, he served as a director of business development at
LCC International, Inc. From 1993 until 1994, Mr. Prakash was the director of
business development for Telemate, a joint venture he helped establish between
LCC and France Telecom.
                                       45
<PAGE>   46

Mr. Prakash is also a director of several private telecommunications companies
controlled by Telcom Ventures. He received an M.B.A. in international finance
from American University and an M.B.A. from the University of New Delhi, Faculty
of Management Studies.

     Janice M. Roberts has been a manager of our limited liability company since
June 1999 and was elected a director of Aether on October 20, 1999. Since
September 1992, Ms. Roberts has served as senior vice president of global
marketing and business development for 3Com. She is also president of 3Com
Ventures, a corporate investment fund, and a director of OpenSky. From January
1992 until September 1992, Ms. Roberts served as vice president and general
manager for 3Com's enterprise networking division. From 1989 until January 1992,
Ms. Roberts was with BICC Communications where she held several positions,
including most recently, president and managing director of its worldwide data
networking business. Previously, she held a number of senior international
marketing, sales and business development positions in engineering, electronics
and communications-based companies. She holds an Honors degree in economics and
business from the University of Birmingham in the United Kingdom and is a member
of the Chartered Institute of Marketing.

     Dr. Rajendra Singh has been a manager of our limited liability company
since December 1997 and was elected a director of Aether on October 20, 1999.
Since December 1993, Dr. Singh has served as chairman of the board of directors
and chief executive officer of Telcom Ventures, L.L.C. From 1983 until June
1996, Dr. Singh served as chairman of the board of directors of LCC
International, Inc., a worldwide provider of wireless engineering and design
services, which he co-founded with his wife in 1983. Dr. Singh has played an
instrumental role in the cellular industry by developing key standards used
today in wireless system design and methodology. Dr. Singh is a member of the
board of directors of Teligent, Inc. and XM Satellite Radio Holdings, Inc. He
received a Ph.D. in electrical engineering from Southern Methodist University.

     George P. Stamas was elected a director of Aether on October 20, 1999.
Since April 1996, Mr. Stamas has been a partner with the law firm of Wilmer,
Cutler & Pickering and since June 1996 he has been co-chairman of that firm's
corporate department. From 1983 until April 1996, Mr. Stamas was a partner at
Piper & Marbury L.L.P. Mr. Stamas is counsel to, and a limited partner of, the
Baltimore Orioles baseball team. Mr. Stamas also serves on the board of
directors of FTI Consulting, Inc., a provider of litigation support services and
Luminant Worldwide Corporation, a provider of Internet consulting services. He
received a B.S. in economics from the Wharton School of the University of
Pennsylvania and a J.D. from University of Maryland Law School.

     Devin N. Wenig has been a manager of our limited liability company since
August 1998 and was elected a director of Aether on October 20, 1999. In April
1994, Mr. Wenig joined Reuters America, Inc. and was promoted to executive vice
president of marketing in August 1998, where he is responsible for marketing and
business development for Reuters's information businesses in the Americas. Mr.
Wenig serves as a director on the boards of Loan Pricing Corp., Intralinks,
Inc., FreeEdgar.com and Nastech Pharmaceutical Company, Inc. He received a B.S.
from Union College and a J.D. from Columbia University.

     Thomas E. Wheeler has been a manager of our limited liability company since
May 1999 and was elected a director of Aether on October 20, 1999. Since 1992,
Mr. Wheeler has served as president and chief executive officer of the Cellular
Telecommunications Industry Association. In 1994, Mr. Wheeler was appointed by
President Clinton to a six-year term as a member of the board of trustees of the
John F. Kennedy Center for the Performing Arts. Mr. Wheeler is a director on the
boards of the Public Broadcasting System and the U.S. Capitol Historical
Society. He received a B.S. in business administration from Ohio State
University.

     David J. Bressler joined us in June 1999 as vice president, AIM sales and
marketing. From June 1995 until April 1999, Mr. Bressler worked at TIBCO
Software, Inc., where he was director of enterprise network solutions. From
April 1994 until May 1995, he was a network design engineer for the network
integration unit of Bell Atlantic Corporation. Mr. Bressler received a B.A. in
mathematics from the City University of New York and an M.B.A. in international
business and information technology from New York University.

     Calvin A. Cassidy joined us in November 1998 as vice president, enterprise
systems and solutions to oversee project development and implementation. From
October 1997 until November 1998, Mr. Cassidy handled project development for
transportation management systems at Lockheed Martin Corp. From January 1995
until October 1997, Mr. Cassidy managed business development for transportation
systems at Tenera, Inc. From July 1980 until

                                       46
<PAGE>   47

January 1995, Mr. Cassidy also developed and delivered advanced defense and
commercial systems at Westinghouse Electric. Mr. Cassidy received a B.S. in
computer science from Virginia Tech, an M.S. from George Washington University
and an M.B.A. from Loyola College in Baltimore.

     John Clarke joined us in January 1996 as vice president, operations and
oversees our customer service and network operations center. From June 1986
until January 1996, Mr. Clarke developed advanced microwave systems at
Westinghouse Corp. He received a B.S. in engineering from Clarkson University
and an M.B.A. from Loyola College in Baltimore.

     William F. Davidson, Jr. joined us in October 1999 as senior vice president
of sales. Prior to joining us, Mr. Davidson worked for 12 years as vice
president of wireless data sales and marketing for Bell Atlantic Mobile. Mr.
Davidson also worked briefly in 1997-1998 as vice president of sales for GE
Capital. Mr. Davidson attended the University of Richmond and Farleigh Dickinson
University in Madison, New York.

     Andrew S. Meister is a co-founder of Aether and serves as vice president,
technical sales. Prior to joining us, he was a vice president, engineering at
NexGen from August 1995 until January 1996. From August 1993 until August 1995,
Mr. Meister was the engineering manager at Mobile Solutions Inc. From January
1987 until August 1993, Mr. Meister was a senior software engineer at United
Parcel Service. Mr. Meister received a B.S. in computer science from
Northeastern University and an M.S. in computer science from Johns Hopkins
University.

     Gregory S. Milbank joined us in June 1998 and serves as vice president,
business development. From 1997 until June 1998, Mr. Milbank was with Reuters
America, Inc. where he held a position in new business development. His duties
at Reuters included development of The Open Systems Group, created to support
trading room system and data feed sales and support, and he was also a member of
the management team that oversaw the acquisition of Quotron from Citibank. Mr.
Milbank began his career in financial information technology in 1983 with Market
Information, Inc., a subsidiary of U.S. Sprint, where he was western regional
manager.

     Michael B. Mills joined us in April 1999 as vice president, business
development. His primary role is to lead initiatives required to launch,
maintain and develop business opportunities and to guide corporate strategy and
alliances. Prior to joining us, Mr. Mills worked for 10 years as a
telecommunications and technology writer. From April 1994 until April 1999, Mr.
Mills wrote for the Washington Post, and from 1987 until April 1994 he wrote for
Congressional Quarterly and other publications. Mr. Mills received a B.A. from
Michigan State University and an M.A. in public affairs journalism from American
University.

     At the time of closing of this offering, our board will have ten directors.
The agreement governing our limited liability company requires the seats on the
board of managers of the limited liability company to be allocated to specific
members identified in the agreement. This agreement will end when we convert to
a corporation before completion of the offering. We expect that four of the
members who will become stockholders of the corporation will enter into a
stockholder agreement that will govern voting for our directors. We expect that
NexGen, Telcom-ATI Investors, L.L.C., Reuters and 3Com-who will together hold
66% of the shares of common stock outstanding after the offering-will be parties
to this agreement. We expect the agreement to require each party to vote all its
shares for two directors named by NexGen, two directors named by Telcom-ATI
Investors, two directors named jointly by NexGen and Telcom-ATI Investors and
one director named by each of Reuters and 3Com. We expect that Messrs. Oros and
Ein will be named by NexGen, Dr. Singh and Mr. Prakash will be named by
Telcom-ATI Investors, Mr. Wenig will be named by Reuters and Ms. Roberts will be
named by 3Com as directors under the stockholder agreement. The right of NexGen
and Telcom-ATI Investors to jointly name two additional directors will not arise
until our first annual meeting. The terms of the limited liability company
agreement and the expected terms of the stockholder agreement are further
described in "Transactions Between Aether and its Officers, Directors and
Significant Stockholders."

     Directors will be elected for a term of one year.

     Our executive officers will be appointed by, and serve at the discretion
of, our board of directors. We expect that each of our officers will devote
substantially full time to our affairs. We expect that our non-employee
directors will devote such time to our affairs as is necessary to discharge
their duties. There are no family relationships among any of our executive
officers, directors or key employees.

                                       47
<PAGE>   48

COMMITTEES OF THE BOARD OF DIRECTORS

     Immediately after the offering, the compensation committee will consist of
Messrs. Beese, Prakash and Wheeler. The compensation committee:

     - determines the compensation of senior executive officers (chief executive
       officer and president, chief operating officer, and chief financial
       officer), subject, if the board so directs, to the board's further
       ratification of the compensation;

     - determines the compensation for other officers or to delegate such
       determinations to the chief executive officer;

     - grants options, stock, or other equity interests under our stock option
       or other equity-based incentive plans; and

     - administers those plans and, where such plans specify, our other employee
       benefit plans.

     Immediately after the offering, the audit committee will consist of Messrs.
Beese and Bonsal. The audit committee:

     - makes recommendations to the board concerning the engagement of
       independent accountants;

     - reviews with the independent accountants the plans and results of the
       audit engagement;

     - approves professional services provided by the independent accountants;

     - considers the range of audit and non-audit fees;

     - verifies that auditors, internal and external, are independent of
       management and are objective in their findings;

     - reviews annual CPA audit and recommendations of internal controls and
       related management response;

     - reviews the audit reports with management and the auditor;

     - oversees the internal audit function; and

     - monitors management's efforts to correct deficiencies described in any
       audit examination.

DIRECTOR COMPENSATION

     Except for reimbursement for reasonable travel expenses relating to
attendance at board meetings and discretionary grants of stock options,
directors will not be compensated for their services as directors. Directors who
are employees will be eligible to participate in our equity incentive plan.
Concurrent with the offering, we have granted options for an aggregate of
150,000 shares to directors at the price of shares in the offering.

     We granted options to acquire units in our limited liability company to
managers of the limited liability company from time to time, and we intend to
convert these options into options for shares of common stock in connection with
our conversion to a corporation. The following table identifies options that we
have granted to non-employee director nominees since January 1, 1996 on the
basis of the number of shares of common stock into which we expect them to
convert.

<TABLE>
<CAPTION>
                                            NUMBER OF
                                        SHARES UNDERLYING    EXERCISE
NON-EMPLOYEE DIRECTOR                      OPTIONS(#)        PRICE($)
- --------------------------------------  -----------------    --------
<S>                                     <C>                  <C>
J. Carter Beese, Jr. .................        75,000          $ .40
Frank A. Bonsal, Jr. .................        37,500           1.77
Mark D. Ein...........................       100,000            .40
George P. Stamas......................         6,250            .40
                                               5,000           2.40
Thomas E. Wheeler.....................        37,500           1.77
</TABLE>

     Messrs. Beese and Ein have exercised all of their options shown above.

                                       48
<PAGE>   49

EXECUTIVE COMPENSATION

     Summary Compensation.  The following table sets forth compensation awarded
to, earned by or paid to our chief executive officer and the other executive
officers whose total cash compensation exceeded $100,000 during the year ended
December 31, 1998. We refer to these three officers as the "named executive
officers." Information regarding options shows the number of shares for which
the options will be exercisable upon conversion of our limited liability company
into a corporation.

<TABLE>
<CAPTION>
                                                                                               LONG-TERM
                                                        ANNUAL COMPENSATION               COMPENSATION AWARDS
                                               -------------------------------------   --------------------------
                                                                                         SHARES
                                                                        OTHER ANNUAL   UNDERLYING     ALL OTHER
                                                                        COMPENSATION    OPTIONS      COMPENSATION
         NAME AND PRINCIPAL POSITION           SALARY ($)   BONUS ($)       ($)           (#)            ($)
         ---------------------------           ----------   ---------   ------------   ----------    ------------
<S>                                            <C>          <C>         <C>            <C>           <C>
David S. Oros................................   $200,000    $150,000           --            --           $--
  Chairman, Chief Executive Officer and
  President
George M. Davis..............................    133,333      52,895       $2,420        75,000           --
  Chief Operating Officer
Dale R. Shelton..............................    109,200       4,000           --        50,000           --
  Senior Vice President, Engineering
</TABLE>

     In addition to the named executive officers, Mr. Reymann, our chief
financial officer, joined us in June 1998 and Mr. Keane, our senior vice
president, strategic development, joined us in August 1999. Mr. Reymann's
employment contract, which is described under "Employment Agreements with
Executive Officers" below, provides for an annual salary of $127,500 and an
award, granted at the time Mr. Reymann joined us, of options to receive 62,500
shares with an exercise price of $1.49 per share. Mr. Keane receives an annual
salary of $150,000 and was awarded options to receive 125,000 shares with an
exercise price of $4.80 per share granted at the time he joined us.

     Option Grants.  The following table shows information regarding stock
options granted to the named executive officers during the year ended December
31, 1998. Each of the options was for units in the limited liability company and
the table shows the number of shares for which the options will be exercisable
upon the conversion of our limited liability company into a corporation before
the offering. No stock appreciation rights were granted to these individuals
during the year.

<TABLE>
<CAPTION>
                                                                                                            POTENTIAL REALIZABLE
                                                                     PERCENTAGE                               VALUE AT ASSUMED
                                                                      OF TOTAL                             ANNUAL RATES OF STOCK
                                                                      OPTIONS                              PRICE APPRECIATION FOR
                                                 NUMBER OF SHARES     GRANTED     EXERCISE                  OPTION TERM($)(2)(3)
                                                UNDERLYING OPTIONS       TO       PRICE PER   EXPIRATION   ----------------------
                     NAME                         GRANTED(#)(1)      EMPLOYEES    SHARE($)       DATE         5%          10%
                     ----                       ------------------   ----------   ---------   ----------   ---------   ----------
<S>                                             <C>                  <C>          <C>         <C>          <C>         <C>
David S. Oros..................................           --              --           --            --          --           --
George M. Davis................................       75,000            12.4%       $1.49     July 2008     $70,373     $178,340
Dale R. Shelton................................       50,000             8.3%       $1.49     July 2008     $46,916     $118,893
</TABLE>

- ---------------

(1) The options will become exercisable in their entirety on July 21, 2001 and
    none of them will become exercisable prior to that date unless there is a
    change of control of Aether, which includes a sale of all our assets or the
    sale of at least 80% of the equity of our company. Stock options issued
    before July 21, 1998 expire on the fifth anniversary of the date of grant,
    regardless of whether the option holder's employment with us has been
    terminated. Options to purchase shares issued on or after July 21, 1998
    expire 90 days after the termination of employment of the option holder.

(2) The 5% and 10% assumed annual rates of compounded stock price appreciation
    are mandated by the SEC and are based on the assumption that the exercise
    price was the fair market value of the shares on the date of grant. The fair
    market value on the date of grant was determined by Aether's board of
    directors and is equal to the stock price paid by Reuters Market Clip
    Holdings Sarl in August 1998 which was negotiated at approximately the same
    time as the issuance of the options. There is no assurance provided to any
    executive officer or any other holder of our securities that the actual
    price appreciation over the 10-year option term will be at the assumed 5%
    and 10% levels or at any other defined level.

                                       49
<PAGE>   50

(3) The potential realizable value of the options assuming no price appreciation
    from the offering price in this offering of $16.00 per share was $1,088,250
    for Mr. Davis and $725,500 for Mr. Shelton.

     Aggregate Option Exercises and Holdings.  No options were exercised by the
named executive officers during the year ended December 31, 1998. The following
table provides information concerning the shares represented by outstanding
options held by each of the named executive officers as of December 31, 1998.

<TABLE>
<CAPTION>
                                                                   NUMBER OF SHARES            VALUE OF UNEXERCISED
                                                                UNDERLYING UNEXERCISED        IN-THE-MONEY OPTIONS AT
                                                              OPTIONS AT DEC. 31, 1998(#)       DEC. 31, 1998($)(1)
                                                              ---------------------------   ---------------------------
                            NAME                              EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
                            ----                              -----------   -------------   -----------   -------------
<S>                                                           <C>           <C>             <C>           <C>
David S. Oros...............................................         --            --        $     --       $     --
George M. Davis.............................................    121,250        78,750        $242,500       $ 75,600
Dale R. Shelton.............................................     93,750        81,250        $187,500       $107,900
</TABLE>

- ---------------

(1) The amount set forth represents the difference between the fair market value
    of the underlying units on December 31, 1998 ($2.40 per share) and the
    exercise price of the option. The fair market value was determined by
    Aether's board of directors and is equal to the stock price paid by 3Com in
    October 1998 which was the most recent stock price paid prior to December
    31, 1998. If the offering price of $16.00 per share was used to calculate
    the value of options, the value of exercisable and unexercisable options
    would increase by $1.6 million and $1.1 million, respectively, for Mr. Davis
    and by $1.3 million and $1.1 million, respectively for Mr. Shelton.

EMPLOYMENT AGREEMENTS WITH EXECUTIVE OFFICERS

     We have entered into employment contracts with Messrs. Oros and Reymann.
Mr. Oros' contract became effective June 22, 1999 and provides for a salary of
$200,000 per year, a performance bonus of up to $100,000 per year and additional
bonuses based on annual revenue targets and proceeds raised from private
placements of our equity securities in 1999. The contract has an initial term
expiring in June 2002 and automatically extends for additional one month
increments until terminated by Aether or Mr. Oros on 15 days notice. Pursuant to
the contract, we granted Mr. Oros a warrant to acquire 875,000 shares of our
common stock. The warrant currently has an exercise price of $1.60 per share of
common stock. We also gave Mr. Oros the right to allocate to key employees of
his choosing warrants to acquire 125,000 shares of common stock having the same
terms and conditions. Mr. Oros has awarded warrants for 50,000 shares of our
common stock to Mr. Davis, 37,500 shares of our common stock to Mr. Shelton and
18,750 shares of our common stock to Mr. Reymann. Mr. Oros subsequently received
our permission to assign part of his warrant, leaving him with a warrant to
acquire 775,000 shares. In September 1999, Mr. Oros received a warrant to
acquire 175,000 shares of our common stock at an exercise price of $4 per share.
From this grant, Mr. Oros subsequently assigned a warrant exercisable for 17,500
shares of our common stock. If we terminate Mr. Oros without cause, he is
entitled to receive from us an amount equal to the salary he would have received
during the balance of the term of the employment contract, and his warrants will
fully vest immediately. Under the contract, "cause" means committing an act of
gross negligence or other willful act that materially adversely affects Aether,
refusing to comply in any respect with specific directions of the managers of
our limited liability company, or being convicted or pleading no contest to any
felony or any misdemeanor involving fraud, breach of trust or misappropriation.
Each of these warrants become exercisable upon completion of this offering if
the offering price is greater than $6 per share.

     Mr. Reymann's contract was entered into June 1, 1999 and provides for a
minimum salary of $127,500 per year. The contract has an initial term expiring
on June 1, 2001. We and Mr. Reymann have agreed that if we terminate him without
cause, he is entitled to receive from us an amount equal to the salary he would
have received during the balance of the term of the employment contract.

1999 EQUITY INCENTIVE PLAN

     We have adopted and our sole stockholder prior to the offering has approved
an equity incentive plan to promote our long-term growth and profitability,
improve stockholder value, and attract, retain and reward highly motivated and
qualified employees and directors. The compensation committee of our Board of
Directors will administer the equity incentive plan unless the Board of
Directors specifies another committee of the Board of Directors or chooses to
act itself as administrator.

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<PAGE>   51

     Under the equity incentive plan, we can grant options for approximately 5.2
million shares of common stock, which number will adjust automatically to be 20%
of our outstanding common stock from time to time. We can grant options to
employees in the form of incentive stock options for up to 3,000,000 shares, but
may choose not to do so. Any options we grant that are not incentive stock
options will be nonqualified stock options.

     All of our employees, directors and certain service providers are eligible
to receive options under the equity incentive plan. For tax reasons, the equity
incentive plan limits the number of shares covered by the options that an
individual can receive in a calendar year to 50% of the total initial pool. The
administrator will determine the prices, exercise schedules, expiration dates
and other material conditions under which optionees may exercise their options.
Except with respect to replacement options, which we grant to replace options
from Aether Systems LLC or companies we acquire, the exercise price of these
options after the initial public offering may not be less than the fair market
value of the common stock on the date of grant. We intend to replace the options
Aether Systems LLC granted with options under this plan when we convert to a
corporation before completion of the offering.

     All options will become exercisable if we have a change of control, except
as option agreements provide otherwise or as necessary to allow pooling of
interest accounting. The plan's administrator may provide that an optionee must
cooperate with us in connection with the change of control to receive this
acceleration. In general, we will have a change of control if, after our initial
public offering:

     - anyone acquires or holds at least 80% of our voting securities, excluding
       holdings by our benefit plans and some other related parties;

     - we complete a merger or consolidation, unless, in general, our pre-merger
       shareholders own more than 20% of the voting securities of the merged
       companies;

     - our board changes in specified ways in connection with proxy contests or
       as a result of adding new directors who are not approved by existing
       directors; or

     - if we complete a liquidation or dissolution or sell or otherwise dispose
       of all or substantially all of our assets.

In addition, unless we provide otherwise, or as necessary to allow pooling of
interest accounting, the equity incentive plan and all options will terminate in
defined circumstances if:

     - we are not the surviving company in a merger, consolidation or
       reorganization;

     - we complete a liquidation or dissolution or sell substantially all our
       assets; or

     - our board approves and we complete a transaction that results in a person
       or entity's owning all of our stock, unless the person or entity is
       related to us in specified ways.

However, before the equity incentive plan would terminate for one of those
reasons, we would either agree that our successor would assume the options
and/or the equity incentive plan, allow optionees to exercise the options if
these options were in-the-money, or cancel the options by paying the amount, if
any, by which the value determined with respect to that transaction exceeds the
exercise price of the options.

     The equity incentive plan limits the time during which an optionee can
exercise an option to no more than ten years. In addition, an optionee who
leaves employment will generally have no more than 90 days to exercise an
option, reduced to no days after employment in terminations for cause, and
additional rules apply to death and disability. The compensation committee may,
however, override the plan's rules, other than the ten year limit. We cannot
grant additional options under the equity incentive plan after the tenth
anniversary of its adoption.

SENIOR BONUS PLAN

     We have adopted a senior bonus plan. A special tax rule in Section 162(m)
of the Internal Revenue Code of 1986, as amended, limits the compensation that
we can deduct for payments to our chief executive officer and the four other
most highly compensated executive officers to $1 million per officer per year.
We intend the senior bonus plan to provide incentive compensation that does not
count against each executive's deduction limit. We may choose to use the senior
bonus plan, or we may pay bonuses under some other future plan to which the tax
deduction limits

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<PAGE>   52

will apply, as long as we do not use the other payments to make up bonuses a
participant loses under the senior bonus plan.

     Unless our Board of Directors selects another committee, the compensation
committee will administer the senior bonus plan and select participants from our
key employees and those of any subsidiaries, although we expect that most
participants will be executive officers. When we refer to the "compensation
committee" in discussing the senior bonus plan, we also mean any other committee
that administers this plan. Only "outside directors" under the tax rules can
determine the participants, set the performance goals, and certify that we or
the participants have met those goals. The compensation committee will either
consist solely of two or more outside directors or those members who do not
satisfy the definition of an outside director will either abstain from voting or
refrain from serving on a subcommittee that then administers this plan. The
compensation committee has broad administrative authority to, among other
things, designate participants, establish performance goals and performance
periods, determine the effect of participant termination of employment and
"change in control" transactions before paying an award, and generally interpret
and administer the senior bonus plan. Neither we nor the Board has designated
any participants or established any performance goals under the senior bonus
plan.

     The compensation committee will select participants for any given time
period based primarily on its judgment as to which executive officers are likely
to be named in our proxy statement as the chief executive officer or one of our
other four most highly compensated executive officers as of the end of the
performance period and that the compensation committee reasonably expects to
have compensation in excess of $1 million. We do not expect any of our employees
to exceed that limit in 1999.

     In setting performance goals, the compensation committee will specify the
applicable performance criteria and targets it will use for such performance
period, which may vary from participant to participant. The performance criteria
and targets will measure one or more of the following company, subsidiary,
operating unit, or division financial performance measures:

     - pre-tax or after-tax net income or earnings;

     - earnings before interest expense, taxes, depreciation and amortization;

     - operating income or gross revenue;

     - profit or operating margin;

     - earnings per share;

     - stock price;

     - cash flows;

     - total stockholder return;

     - total stockholder return as compared to total return, on a comparable
       basis, of a publicly available index such as the Standard & Poor's 500
       Stock Index;

     - return on equity, on capital or on investment;

     - ratio of debt to stockholders' equity;

     - subscriber growth;

     - working capital; or

     - strategic business criteria consisting of one or more objectives based
       upon meeting specified revenue, market penetration, geographic business
       expansion goals, cost targets and goals relating to acquisitions or
       divestitures.

     The compensation committee may set these goals (1) on an absolute
stand-alone basis, or on a relative basis in comparison to others, (2) based on
internal targets, (3) based on comparison with prior performance, (4) based on
comparison to capital, shareholders' equity, shares outstanding, assets or net
assets, and/or (5) based on comparison to the performance of other companies.
For example, the compensation committee could express an income-based
performance measure in a number of ways, such as net earnings per share, or
return on equity or with reference to
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<PAGE>   53

meeting or exceeding a specific target, or with reference to growth above a
specified level, such as prior year's performance or peer group performance. The
compensation committee can also ignore unusual or nonrecurring accounting
effects. The senior bonus plan provides that achieving these goals must be
substantially uncertain at the time the goals are established and are subject to
the committee's right to reduce the amount of any award payable as a result of
the performance as discussed below.

     The compensation committee may set a participant's target bonus, that is,
the amount the participant will receive if the targets are met, as a dollar
amount or in a formula, for example as a percentage share of a bonus pool,
provided that, if the committee uses a pool approach, the total bonus
opportunity for all participants who are part of the pool may not total more
than 100% of the pool. The committee has the sole discretion to reduce, but not
increase, the actual bonus awarded under the plan. The committee must determine
the extent to which the performance goals are met and the participant becomes
entitled to a bonus.

     The maximum bonus payable under the senior bonus plan to any one individual
in any one calendar year is $3 million, although we have no plans or
expectations at this time to pay bonuses of that size.

     Our board or the committee may at any time amend the senior bonus plan, and
our board may terminate the plan. However, without a participant's written
consent, no amendment or termination may materially adversely affect the annual
bonus rights, if any, of any already designated participant for a given
performance period after the participants and targets are set. Our board may
make any amendments necessary to comply with applicable regulatory requirements,
including the tax deduction limit for senior executives. If necessary to
preserve the intended tax treatment, the board may submit future amendments of
the senior bonus plan to our shareholders for approval.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     None of the members of our compensation committee is an officer or employee
of Aether. Other than Mr. Oros, who is an executive officer of Aether and
OpenSky and who serves on the boards of directors of Aether and OpenSky, none of
our executive officers serves as a member of the board of directors or
compensation committee of any entity that has one or more executive officers
serving on our board of directors or compensation committee.

LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS

     Our certificate of incorporation will limit the liability of directors to
the maximum extent permitted by Delaware law. Delaware law provides that a
director of a corporation will not be personally liable for monetary damages for
breach of an individual's fiduciary duties as a director except for liability:

     - for any breach of a director's duty of loyalty to Aether or to its
       stockholders;

     - for acts or omissions not in good faith or that involve intentional
       misconduct or a knowing violation of law;

     - for unlawful payments of dividends or unlawful stock repurchases or
       redemptions as provided in Section 174 of the Delaware General
       Corporation Law; or

     - for any transaction from which a director derives an improper personal
       benefit.

     Our bylaws will provide that Aether will indemnify its directors and
executive officers and may indemnify its officers, employees and other agents to
the full extent permitted by law. We believe that indemnification under our
bylaws will cover at least negligence and gross negligence on the part of an
indemnified party. Our bylaws also will permit us to advance expenses incurred
by an indemnified party in connection with the defense of any action or
proceeding arising out of a party's status or service as a director, officer,
employee or other agent of Aether upon an undertaking by the party to repay the
advances if it is ultimately determined that he or she is not entitled to
indemnification.

     We will enter into separate indemnification agreements with each of our
directors and officers. These agreements will require us to, among other things,
indemnify the director or officer against expenses (including attorney's fees),
judgments, fines and settlements paid by the individual in connection with any
action, suit or proceeding arising out of the individual's status or service as
a director or officer of Aether (other than liabilities arising from willful
misconduct or conduct that is knowingly fraudulent or deliberately dishonest)
and to advance expenses incurred by

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<PAGE>   54

the individual in connection with any proceeding against the individual with
respect to which he or she may be entitled to indemnification by us.

     We believe that our proposed certificate of incorporation and bylaw
provisions and indemnification agreements are necessary to attract and retain
qualified persons as directors and officers. Following completion of this
offering, we also will maintain directors' and officers' liability insurance.

     At present we are not aware of any pending litigation or proceeding
involving any director, officer, employee or agent of Aether where
indemnification will be required or permitted. Furthermore, we are not aware of
any threatened litigation or proceeding that might result in a claim for
indemnification.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers or persons controlling our company
pursuant to the foregoing provisions, we have been informed that, in the opinion
of the SEC, such indemnification is against public policy as expressed in the
Securities Act and is therefore unenforceable.

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<PAGE>   55

                      TRANSACTIONS BETWEEN AETHER AND ITS
                OFFICERS, DIRECTORS OR SIGNIFICANT STOCKHOLDERS

     Since our inception, we have engaged in the following transactions with
executive officers, directors and owners of 5% or more of our equity, or
entities related to them.

EQUITY INVESTMENTS

     The following discussion describes the issuance of units of our limited
liability company in connection with its initial capitalization and subsequent
financings. Immediately before we complete this offering, our limited liability
company will be converted into a corporation and each unit in the limited
liability company will be converted into two and one-half shares of our common
stock and each option or warrant for one unit will be converted into an option
or warrant for two and one-half shares of our common stock.

     Aeros L.L.C., our predecessor, was formed in January 1996 by NexGen
Technologies, L.L.C. and a predecessor to Transettlements, Inc. At the time
Aeros was formed, NexGen contributed assets in the wireless data field in
exchange for 3,000,000 units (equivalent to 7,500,000 shares) and
Transettlements contributed $1,000,000 in cash in exchange for 1,000,000 units
(equivalent to 2,500,000 shares). In May 1996, Transettlements contributed an
additional $500,000 in exchange for an additional 500,000 units (equivalent to
1,250,000 shares). In August 1996, we changed our name to Aether Technologies
International, L.L.C. Then, in September 1999, we changed our name to Aether
Systems LLC.

     In February 1997, a subsidiary of Telcom Ventures, L.L.C. acquired 290,000
units (equivalent to 725,000 shares) from Transettlements and 43,000 units
(equivalent to 107,500 shares) from NexGen and contributed $1,000,000 to Aether
in exchange for 625,000 units (equivalent to 1,562,500 shares). Additionally,
Telcom Ventures was granted an option to purchase 710,000 units (equivalent to
1,775,000 shares) from Transettlements and two options to purchase a total of
907,000 units (equivalent to 2,267,500 shares) from NexGen. In December 1997,
Telcom Ventures and its subsidiary contributed an additional $690,369 to Aether
in exchange for an additional 230,123 units (equivalent to 575,308 shares). In
June 1999, Telcom Ventures exercised its option with Transettlements and one of
its options with NexGen to purchase 710,000 and 157,000 units, respectively
(equivalent to 1,775,000 and 392,500 shares, respectively). Aether did not
receive any proceeds from the exercise of these options.

     In October 1997, we borrowed $100,000 from Reuters Group Overseas Holdings
(UK) Limited pursuant to a demand note that accrued interest at 7% per year. In
January 1998, we borrowed an additional $100,000 from Reuters at an accrued
interest rate of 7% per year pursuant to a second demand note. In March 1998, as
part of the consideration paid by Reuters for Aether's development of
MarketClip, Reuters cancelled both of these notes.

     In January 1998, Pyramid Ventures, Inc., a subsidiary of Bankers Trust
Corporation, acquired 333,333 units (equivalent to 833,333 shares) at $3.00 per
unit and 401,961 units (equivalent to 1,004,903 shares) at $3.73 per unit for
total proceeds to Aether of approximately $2.5 million. At that time, Aether
redeemed 83,333 units (equivalent to 208,333 shares) held by NexGen for $249,999
and 250,000 units (equivalent to 625,000 shares) held by Transettlements for
$750,000. As part of the financing arrangement, Pyramid agreed to use reasonable
efforts (1) to cause BT Alex. Brown to purchase 100 subscriptions to MarketClip
for a 12-month period or (2) to refer affiliates of BT Alex. Brown or third
parties to Aether for the purpose of entering into development contracts with an
aggregate price of $300,000 over a two-year period.

     In June 1998, Telcom Ventures and Pyramid each loaned us $250,000. The
notes accrued interest at 8% per year and were due on demand with a stated
maturity date of the earlier of December 31, 1998 or the closing of an
anticipated private placement of units. The notes were convertible into units at
the option of the holder at the rate of $250,000 divided by the per unit price
to be paid in the anticipated private placements. In connection with the
issuance of these notes, we also issued 5,656 warrants (equivalent to 14,140
shares) with an exercise price of $0.01 per unit to each of Telcom Ventures and
Pyramid. Pyramid converted its $250,000 loan plus accrued interest in August
1998 into 57,180 units (equivalent to 142,950 shares) at a per unit price of
$4.42 and exercised its warrant and acquired 5,656 units (equivalent to 14,140
shares). In August 1998, we repaid the amount owed Telcom Ventures, including
$2,520 in interest. In August 1999, Telcom Ventures exercised its warrant and
acquired 5,656 units (equivalent to 14,140 shares) at a per unit price of $0.01.

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<PAGE>   56

     In August 1998, Reuters received 1,131,222 units (equivalent to 2,828,055
shares) in exchange for $4,735,020 in cash and forgiveness of $530,980 we owed
Reuters for hardware and other inventory, offset by $266,000 Reuters owed us
under a license agreement we previously entered into with Reuters relating to
sales of MarketClip and related fees.

     In October 1998, 3Com Corp. contributed $6,000,000, in exchange for
1,000,000 units (equivalent to 2,500,000 shares). At the same time we issued
3Com a conditional warrant to purchase 357,466 units (equivalent to 893,665
shares) exercisable at $0.01 per unit if the milestones described below are
achieved before October 29, 2001. 3Com achieved the first milestone entitling it
to exercise 57,466 units (equivalent to 143,665 shares) as a result of having
completed a joint sales and marketing plan. 3Com may exercise an additional
150,000 units (equivalent to 375,000 shares) when we receive $6 million in
engineering services revenue from business opportunities introduced by 3Com.
3Com may exercise an additional 150,000 units (equivalent to 375,000 shares) if
we attain 6,000 wireless service subscribers as a result of business
opportunities introduced to us by 3Com. 3Com has not attained either of these
last two milestones and has not exercised any of its warrants.

     Effective June 1999, we issued to Mr. Oros a warrant to acquire 350,000
units (equivalent to 875,000 shares) at an exercise price of $.01 per unit. We
subsequently agreed with Mr. Oros to amend the exercise price to $4 per unit. We
also gave Mr. Oros the right to allocate to key employees of his choosing
warrants to acquire 50,000 units (equivalent to 125,000 shares) having the same
terms and conditions. Mr. Oros has awarded warrants to acquire 20,000 units
(equivalent to 50,000 shares) to Mr. Davis, 15,000 units (equivalent to 37,500
shares) to Mr. Shelton and 7,500 units (equivalent to 18,750 shares) to Mr.
Reymann. Mr. Oros subsequently received our permission to subdivide his warrant
to give Mark Ein a warrant to acquire 40,000 units (equivalent to 100,000
shares), leaving Mr. Oros with a warrant to acquire 310,000 units (equivalent to
775,000 shares). In September 1999, when we increased the exercise price on the
warrants issued to Mr. Oros in June 1999, we granted Mr. Oros a warrant to
acquire an additional 70,000 units (equivalent to 175,000 shares) at an exercise
price of $10 per unit to compensate him for the increase in the exercise price
on the earlier warrants. From this grant, Mr. Oros subsequently assigned a
warrant exercisable for 7,000 units (equivalent to 17,500 shares) to Mr. Ein.

     In August 1999, we issued to Mr. Ein 40,000 units (equivalent to 100,000
shares) upon exercise of his options at an exercise price of $1.00 per unit. In
September 1999, Mr. Beese exercised an option for 30,000 units (equivalent to
75,000 shares) at an exercise price of $1.00 per unit.

LIMITED LIABILITY COMPANY AGREEMENT, STOCKHOLDERS AGREEMENT AND REGISTRATION
RIGHTS AGREEMENT

     NexGen, Transettlements, Telcom Ventures, Pyramid, Reuters, 3Com and
Messrs. Beese and Ein are members in our limited liability company and parties
to a limited liability company agreement. All members own units of the same
class. The members have the right to participate in any additional equity
financings in order to maintain their current percentage ownership interest. We
expect that these rights will be extinguished in connection with our conversion
into a corporation. The members authorized a group of nine managers to manage
and direct our business and affairs. Under the agreement, NexGen appoints four
managers, Telcom Ventures appoints two managers and each of the other members,
other than Transettlements, Mr. Beese and Mr. Ein, appoints one manager. The
agreement allows members to conduct business with us so long as the terms are
fair and reasonable to us and have been approved by the managers. Extraordinary
transactions such as the issuance of additional securities, a sale or merger,
the acquisition of substantial assets or the removal of Mr. Oros require the
vote of 60% of all units held by the members other than Mr. Ein. Each member
must approve any change to the agreement if the change would have a materially
adverse effect on the member's rights and obligations. The members have granted
each other rights of first refusal, rights to join with another member selling
its units to a third party and rights to require other members to sell their
units to a third party.

     The limited liability company agreement gives members the right to have
sales of some of their interests registered under the Securities Act in
connection with this offering, but all members have agreed to waive this right.

     The limited liability company agreement will terminate upon conversion of
the limited liability company into a corporation immediately prior to the
completion of this offering. We expect that NexGen, Telcom-ATI Investors,
Reuters and 3Com will enter into a stockholder agreement before completion of
the offering. Under the stockholder agreement, these parties will vote for two
directors named by each of NexGen and Telcom-ATI Investors and for one director
named by each of Reuters and 3Com. In addition, commencing on the date of the
first annual meeting of
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<PAGE>   57

stockholders, if the board of directors consists of up to nine members, these
parties will vote to elect to the board of directors one additional person named
jointly by NexGen and Telcom-ATI Investors Ventures; and if the board of
directors consists of 10 or 11 members, the parties will vote to elect two
members named jointly by NexGen and Telcom-ATI Investors. We expect the right to
name directors will end when these stockholders reduce their share ownership
below levels set forth in the agreement.

     We will enter into a registration rights agreement with NexGen, Telcom-ATI
Investors, Reuters, 3Com and Transettlements, which will entitle these parties
to an aggregate of three demand registrations at any time after the first
anniversary of this offering, and at the request of these parties, include in
any registration statement for our own account or the account of any other
stockholder, the shares of common stock held by those parties, subject to
limitations set forth in the agreement. We also expect the agreement will
require us to file a shelf registration statement covering the sale of all
shares held by parties to the stockholder agreement from time to time. We expect
the agreement will require us to file the shelf registration statement only when
we are eligible to use the short form registration statement on Form S-3, which
would be at least one year from the closing of this offering.

LOAN TO NEXGEN

     In September 1998, we loaned NexGen $155,000 at an interest rate of 7.5%
per year pursuant to two notes. One note for $95,000 was due in December 1998,
and one note for $60,000 was due in October 1998. In August 1999, both notes
were amended to be due upon 30 days notice. On December 24, 1998, NexGen made a
payment of $19,346 with respect to these notes.

REUTERS LICENSE AGREEMENT

     In August 1998, we entered into an amended license, marketing and
distribution agreement with Reuters, which continues through August 11, 2001 and
renews automatically for successive one-year terms unless either party provides
180 days prior written notice. Reuters granted us a non-exclusive license to use
the information supplied by Reuters Selectfeed Plus for distribution to
subscribers of MarketClip, AirBroker and for development purposes. In August
1999, Reuters granted us permission to use Selectfeed Plus information for the
TradeRunner service developed for Discover Brokerage and the services we are
developing with Charles Schwab and Bear Stearns. Pursuant to the agreement,
Aether granted Reuters an exclusive license to use the systems developed by
Aether to transmit Reuters information to wireless handheld devices and a
license to use the MarketClip software for purposes of supplying subscribers
with MarketClip. The geographic scope of all of the licenses under the agreement
is limited to the United States. Under the agreement, Reuters has a right of
first refusal to purchase units of Aether if Aether or any unit holder sells
units and, as a result, a competitor of Reuters holds 50% or more of our units,
or if we sell all or substantially all of our assets to a competitor of Reuters.
Under the terms of the license, we pay Reuters a monthly fee for each subscriber
to our services that use information provided by Reuters. During 1998 we paid
Reuters $40,300 under this contract and the average monthly fee per subscriber
was $4.89; during the first six months of 1999 we paid Reuters $58,606 under
this contract and the average monthly fee per subscriber was $4.97.

OPENSKY

     On August 9, 1999, we formed a new company with 3Com in which we acquired
an interest in AirWeb Corporation, which is doing business as OpenSky. We
contributed a perpetual, non-exclusive, non-assignable, royalty-free worldwide
license to our AIM software platform in exchange for 7,000,000 shares of Series
A Preferred Stock-which represents a 26% equity interest in OpenSky on a fully
diluted basis and an option to buy up to an additional 3,000,000 shares of
Series A Preferred Stock for an aggregate exercise price of $2.5 million. If we
exercise our option, we will own up to approximately 33% of the equity of
OpenSky on a fully diluted basis. Our option to acquire these additional shares
expires at the earlier of January 31, 2000 or 15 days after we close our initial
public offering. We intend to exercise this option in full upon completion of
this offering. In connection with the formation of the joint venture, 3Com paid
$7.0 million in cash and agreed to contribute to OpenSky a perpetual,
non-exclusive, non-assignable license to 3Com's Web Clipping technology
(including rights to derivative works) and Palm OS software in exchange for
10,000,000 shares of Series A Preferred Stock, representing a 33% equity
interest in OpenSky on a fully diluted basis. The management team of OpenSky
will acquire in the aggregate 4.2 million shares of common

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<PAGE>   58

stock and options to acquire an additional 5.8 million shares, which together
represent a 33% equity interest in OpenSky on a fully diluted basis.

     As part of our investment with 3Com in OpenSky, we each received
registration rights, including two demand registration rights that we can use
after the earlier of the completion of OpenSky's initial public offering and
August 9, 2004. We also entered into a right of first refusal and co-sale
agreement, which, among other things, requires the management team to first
offer any OpenSky securities to OpenSky and then to us and 3Com before selling
the securities to a third party. This agreement also allows us and 3Com to sell
a pro rata portion of our stock to a third party along with the management team
if the right of first refusal is not exercised. We and 3Com have also agreed
that before either of us sells any shares of Series A Preferred Stock to an
unrelated third party, we would first offer the other (or any other holders of
Series A Preferred Stock) those shares on a pro rata basis and then to OpenSky.

     Aether, 3Com and OpenSky's management are each entitled to appoint one
director to OpenSky's board of directors. OpenSky's board of directors currently
consists of three members: David S. Oros, our chairman, chief executive officer
and president; Janice M. Roberts, who is expected to be one of our directors, is
the senior vice president, marketing and business development of 3Com; and
Patrick McVeigh, OpenSky's president and chief executive officer (and former
president of the Palm Computing division of 3Com). We have entered into a voting
agreement with 3Com and OpenSky's management in which each of the parties has
agreed to vote in favor of each of the directors named by Aether, 3Com and
OpenSky's management until the earliest of (1) OpenSky's completion of an
initial public offering of at least $15 million, (2) OpenSky's completion of a
sale of substantially all of the assets of OpenSky or the transfer of more than
50% of the voting power of OpenSky or (3) the parties' termination of the
agreement. OpenSky cannot take certain major corporate actions, such as selling
the company or issuing securities with rights and preferences senior to the
Series A Preferred Stock, without the approval of holders of two-thirds of the
Series A Preferred Stock.

     On August 9, 1999, we entered into a letter agreement with OpenSky under
which we have agreed to provide OpenSky, for a period of ten months from the
date of the letter agreement, engineering services for the design and
development of its proposed systems and services. The letter agreement provides
that OpenSky will pay us $250,000 per month for these services, in addition to
$500,000 they paid us for work performed prior to the date of the letter
agreement. Additionally, for a period of five years from the date of the letter
agreement, OpenSky has agreed to provide us the right to resell OpenSky's basic
package of services. We also have a right of first refusal for development of
all investment banking and brokerage applications for OpenSky for a period of
two years from the date of the letter agreement, subject to approval of the
company for whom the service is developed.

                                       58
<PAGE>   59

                             PRINCIPAL STOCKHOLDERS

     The following table sets forth certain information with respect to
beneficial ownership of our common stock as of October 15, 1999, and as adjusted
to reflect the sale of 6,000,000 shares of common stock offered in this
offering, as to:

     - each person (or group of affiliated persons) known by us to own
       beneficially more than 5% of our outstanding common stock;

     - each of our directors;

     - each of the executive officers named in the summary compensation table;
       and

     - all our directors and executive officers as a group.

     The table reflects the expected conversion of Aether from a limited
liability company to a corporation and the exchange of units in the limited
liability company into shares of common stock.

     Except as indicated in the footnotes to this table and under applicable
community property laws, to our knowledge, the persons named in the table have
sole voting and investment power with respect to all shares of common stock.
Options exercisable on or before November 30, 1999, are included as shares
beneficially owned. For the purposes of calculating percent ownership as of
October 15, 1999, 20,066,995 shares were issued and outstanding, and, for any
individual who beneficially owns shares represented by options exercisable on or
before November 30, 1999, these shares are treated as if outstanding for that
person, but not for any other person. Unless otherwise indicated, the address of
each of the individuals and entities named below is: c/o Aether Systems, Inc.,
11460 Cronridge Drive, Owings Mills, Maryland 21117.

<TABLE>
<CAPTION>
                                                                                 PERCENT
                                                                           BENEFICIALLY OWNED
                                                                           -------------------
                                                                NUMBER      BEFORE     AFTER
                      NAME AND ADDRESS                        OF SHARES    OFFERING   OFFERING
                      ----------------                        ----------   --------   --------
<S>                                                           <C>          <C>        <C>
DIRECTORS AND EXECUTIVE OFFICERS:
David S. Oros (1)...........................................   7,724,168     37.1%       28.8%
George M. Davis (2).........................................     175,000         *           *
Dale R. Shelton (3).........................................     150,000         *           *
Frank A. Bonsal, Jr. (4)....................................      37,500         *           *
  1119 St. Paul Street
  Baltimore, MD 21202
J. Carter Beese (5).........................................      75,000         *           *
Mark D. Ein (6).............................................     217,500      1.1%           *
Rahul C. Prakash (7)........................................           0                     *
  c/o Telcom Ventures, L.L.C.
  211 N. Union St., Suite 300
  Alexandria, VA 22314
Janice M. Roberts (8).......................................           0         *           *
  c/o 3Com Corporation
  5400 Bayfront Plaza
  Santa Clara, CA 95952
Dr. Rajendra Singh (9)......................................   5,151,948     25.7%       19.8%
  c/o Telcom Ventures, L.L.C.
  211 N. Union St., Suite 300
  Alexandria, VA 22314
George P. Stamas (10).......................................      11,250         *           *
  c/o Wilmer, Cutler & Pickering
  100 Light Street
  Baltimore, MD 21202
Devin N. Wenig..............................................           0         *           *
  c/o Reuters America, Inc.
  1700 Broadway, 2nd Floor
  New York, NY 10019
</TABLE>

                                       59
<PAGE>   60

<TABLE>
<CAPTION>
                                                                                 PERCENT
                                                                           BENEFICIALLY OWNED
                                                                           -------------------
                                                                NUMBER      BEFORE     AFTER
                      NAME AND ADDRESS                        OF SHARES    OFFERING   OFFERING
                      ----------------                        ----------   --------   --------
<S>                                                           <C>          <C>        <C>
Thomas E. Wheeler (11)......................................      37,500         *           *
All directors and executive officers as a group (14 persons)  13,659,864     63.2%       49.5%
  (12)......................................................
5% STOCKHOLDERS:
3Com Corporation (13).......................................   2,643,665     13.1%       10.1%
  5400 Bayfront Plaza
  Santa Clara, CA 95052
NexGen Technologies, L.L.C..................................   6,791,668     33.8%       26.1%
Pyramid Ventures, Inc. (14).................................   1,995,325      9.9%        7.7%
  One Bankers Trust Plaza
  130 Liberty Street
  New York, NY 10006
Reuters MarketClip Holdings Sarl (15).......................   2,828,055     14.1%       10.9%
  c/o Reuters America, Inc.
  1700 Broadway, 2nd Floor
  New York, NY 10019
Telcom-ATI Investors, L.L.C.................................   5,151,948     25.7%       19.8%
  211 N. Union St., Suite 300
  Alexandria, VA 22314
</TABLE>

- ---------------
  *  Less than 1%.

 (1) Includes 6,791,668 shares owned by NexGen Technologies, L.L.C. over which
     Mr. Oros exercises voting and investment control by virtue of his position
     as Managing Member of NexGen. Also includes warrants to purchase 932,500
     shares of common stock that will be immediately exercisable when this
     offering closes, assuming that the offering price is $6 per share or
     greater.

 (2) Includes vested options to purchase 125,000 shares of common stock and
     warrants to purchase 50,000 shares of common stock when this offering
     closes, assuming that the offering price is $6 per share or greater.

 (3) Includes vested options to purchase 112,500 shares of common stock and
     warrants to purchase 37,500 shares of common stock when this offering
     closes, assuming that the offering price is $6 per share or greater.

 (4) The amount shown excludes approximately 18,170 shares in which Mr. Bonsal
     has an indirect interest as a result of his non-voting limited liability
     company membership interest in Telecom-ATI Investors.

 (5) Includes 75,000 shares owned by JCB Holdings, a legal entity for the
     benefit of the Beese family, over which Mr. Beese exercises voting and
     investment control. The amount shown excludes approximately 103,825 shares
     in which Mr. Beese has an indirect interest as a result of his non-voting
     limited liability company membership interest in Telecom-ATI Investors.

 (6) Includes warrants to purchase 100,000 shares of common stock when this
     offering closes, assuming that the offering price is $6 per share or
     greater and warrants to purchase 17,500 shares of common stock at $4 per
     share.

 (7) Mr. Prakash, the president of Telcom-ATI Investors, (which is controlled by
     Telcom Ventures, LLC), disclaims beneficial ownership of the 5,151,948
     shares owned by Telcom-ATI Investors including approximately 52,000 shares
     in which he has an indirect interest as a result of his option to acquire a
     non-voting limited liability company membership interest in Telcom-ATI
     Investors.

 (8) Ms. Roberts is senior vice president global marketing and business
     development of 3Com Corp. and president of 3Com Ventures. Ms. Roberts
     disclaims beneficial ownership of shares held by 3Com Corp.

 (9) Includes 5,151,948 shares owned by Telcom-ATI Investors and entities it
     controls, over which Dr. Singh exercises voting and investment control by
     virtue of his position as chairman and chief executive officer of
     Telcom-ATI Investors.

                                       60
<PAGE>   61

(10) Includes vested options to purchase 11,250 shares of common stock. The
     amount shown excludes approximately 15,572 shares in which Mr. Stamas has
     an indirect interest as a result of his non-voting limited liability
     company membership interest in Telecom-ATI Investors.

(11) Includes vested options to purchase 37,500 shares of common stock.

(12) Includes all the shares and options identified above and options for 20,833
     shares that will be immediately exercisable when this offering closes,
     assuming that the offering price is $6 per share or greater, and 62,500
     shares issuable upon exercise of options exercisable by November 30, 1999.

(13) Includes vested options to purchase 143,665 shares of common stock.

(14) Pyramid Ventures, Inc. is an indirect wholly-owned subsidiary of
     DeutscheBank AG.

(15) Reuters MarketClip Holdings Sarl is an indirect wholly-owned subsidiary of
     Reuters Group plc.

                                       61
<PAGE>   62

                          DESCRIPTION OF CAPITAL STOCK

     Following the closing of the sale of the shares offered hereby, our
authorized capital stock will consist of 75,000,000 shares of common stock, $.01
par value, and 1,000,000 shares of preferred stock, $.01 par value.

COMMON STOCK

     As of October 20, 1999, there were 20,066,995 shares of common stock
outstanding that were held of record by approximately eight stockholders after
giving effect to the conversion of Aether from a limited liability company and
the exchange of each limited liability company unit into two and one-half shares
of common stock. As of the same date, there were options and warrants to
purchase a total of 4,901,520 shares of common stock after giving effect to the
conversion of Aether from a limited liability company and this offering. There
will be 26,066,995 shares of common stock outstanding (assuming no exercise of
the underwriters' over-allotment option) after giving effect to the sale of the
shares of common stock offered by this prospectus.

     The holders of common stock are entitled to one vote per share on all
matters to be voted upon by the stockholders. Subject to preferences that may be
applicable to any outstanding preferred stock, the holders of common stock are
entitled to receive ratably any dividends that may be declared from time to time
by the board of directors out of funds legally available therefor. In the event
of a liquidation, dissolution or winding up of Aether, the holders of common
stock are entitled to share ratably in all assets remaining after payment of
liabilities, subject to prior rights of holders of preferred stock, if any, then
outstanding. The common stock has no preemptive or conversion rights or other
subscription rights. There are no redemption or sinking fund provisions
available to the common stock. All outstanding shares of common stock are fully
paid and non-assessable.

PREFERRED STOCK

     Effective upon the closing of this offering, Aether will be authorized to
issue 1,000,000 shares of undesignated preferred stock. The board of directors
will have the authority to issue the undesignated preferred stock in one or more
series and to determine the powers, preferences and rights and the
qualifications, limitations or restrictions granted to or imposed upon any
wholly unissued series of undesignated preferred stock and to fix the number of
shares constituting any series and the designation of a series, without any
further vote or action by the stockholders. The issuance of preferred stock may
have the effect of delaying, deferring or preventing a change in control of
Aether without further action by the stockholders and may adversely affect the
voting and other rights of the holders of common stock. Furthermore, this
preferred stock may have other rights, including economic rights senior to the
common stock, and, as a result, the issuance of preferred stock could have a
material adverse effect on the market value of the common stock. At present, we
have, no plans to issue any shares of preferred stock.

STOCKHOLDER'S AGREEMENT

     We expect NexGen, Telcom-ATI Investors, Reuters and 3Com to enter into a
stockholders agreement, which will require these parties to vote to elect to the
board of directors two persons named by each of NexGen and Telcom-ATI Investors,
two persons named jointly by NexGen and Telcom-ATI Investors and one person
named by each of Reuters and 3Com. We describe the expected terms of this
agreement in further detail in "Transactions Between Aether and its Officers,
Directors or Significant Stockholders" at page 56.

REGISTRATION RIGHTS OF STOCKHOLDERS

     Pursuant to the terms of the agreement governing our limited liability
company, the members of the limited liability company had registration rights
with respect to the units of the limited liability company or any common stock
received upon conversion of the limited liability company into a corporation,
but all members have agreed to waive this right. This agreement, and our
obligation to register shares, is terminating with conversion of the limited
liability company into a corporation. We and the members of the limited
liability company are entering into a registration rights agreement requiring us
to register their shares on demand beginning one year after the date of the
offering. We describe the expected terms of this agreement in further detail in
"Transactions Between Aether and its Officers, Directors or Significant
Stockholders" at page 57.

                                       62
<PAGE>   63

ANTI-TAKEOVER PROVISIONS OF DELAWARE LAW AND CHARTER PROVISIONS

     Our certificate of incorporation and bylaws contain provisions that are
intended to enhance the likelihood of continuity and stability in the
composition of our board of directors and in the polices formulated by our board
of directors. In addition, provisions of Delaware law may hinder or delay an
attempted takeover of Aether other than through negotiation with our board of
directors. These provisions could have the effect of discouraging attempts to
acquire us or remove incumbent management even if some or a majority of our
stockholders believe this action to be in their best interest, including
attempts that might result in the stockholders' receiving a premium over the
market price for the shares of common stock held by stockholders.

     Removal and replacement of directors.  Under our certificate of
incorporation and bylaws, directors may only be removed with cause. In addition,
a majority of the directors then in office can fill board vacancies and
newly-created directorships resulting from any increase in the size of the board
of directors, even if those directors do not constitute a quorum or only one
director is left in office. These provisions could prevent stockholders,
including parties who want to take over or acquire us, from removing incumbent
directors without cause and filling the resulting vacancies with their own
nominees.

     Advance notice provisions for stockholder proposals and stockholder
nominations of directors.  The bylaws establish an advance notice procedure
regarding stockholder proposals and nominations for director. The advance notice
procedure will not apply to proposals by our board of directors or management.
Any stockholder that wishes to make a proposal or nominate a director for
election at an annual meeting must deliver us notice of the proposal or the
nomination not less than 45 days nor more than 90 days before the first
anniversary of the proxy statement for the preceding year's annual meeting. For
a special meeting, the notice must generally be delivered not less than 70 days
nor more than 90 days before a special meeting or ten days following the day on
which public announcement of the meeting is first made. This advance notice
proposal could prevent someone interested in acquiring us from proposing actions
that could facilitate the takeover.

     Special meetings of stockholders and actions in lieu of a meeting.  Our
certificate of incorporation and bylaws permit special meetings of the
stockholders to be called only by the board of directors, the chairman of the
board or the president or holders of at least 50% of our securities that are
outstanding and entitled to vote generally in an election of directors. The
stockholders may take action by written consent in lieu of a meeting only if
such consent is signed by all stockholders. These provisions may make it more
difficult for stockholders to take actions opposed by the board of directors.

     Authorized but unissued shares.  Without further stockholder approval, we
can issue shares of common stock and preferred stock up to the number of shares
authorized for issuance in our certificate of incorporation, except as limited
by Nasdaq rules. We could use these additional shares for a variety of corporate
purposes. These purposes include future public offerings to raise additional
capital, corporate acquisitions and employee benefit plans. Our ability to issue
these shares of common stock and preferred stock could make it more difficult,
or discourage an attempt, to obtain control of Aether by means of a proxy
contest, tender offer, merger or otherwise.

     Amendment of bylaws.  The Delaware General Corporation Law generally
provides that the affirmative vote of a majority of the shares entitled to vote
on any matter is required to amend a corporation's certificate of incorporation
or bylaws, unless the corporation's certificate of incorporation or bylaws, as
the case may be, requires a greater percentage. Our certificate of incorporation
and bylaws require the affirmative vote of the holders of at least 66-2/3% of
our outstanding voting stock to amend or repeal our bylaws. Our bylaws may also
be amended or repealed by a simple majority vote of the board of directors.

     Section 203 of Delaware Law.  In addition to the foregoing provisions of
our certificate of incorporation and bylaws, we will be subject to the
provisions of Section 203 of the Delaware General Corporation Law. In general,
the statute prohibits a publicly-held Delaware corporation from engaging in a
"business combination" with an "interested stockholder" for a period of three
years after the date that the person became an interested stockholder unless
(with exceptions) the business combination or the transaction in which the
person became an interested stockholder is approved in a prescribed manner.
Generally, a "business combination" includes a merger, asset or stock sale or
other transaction resulting in a financial benefit to the stockholder, and an
"interested stockholder" is a person who, together with affiliates and
associates, owns (or within three years prior, did own) 15% or more of the
corporation's

                                       63
<PAGE>   64

outstanding voting stock. This provision may have the effect of delaying,
deferring or preventing a change in control of Aether without further action by
the stockholders. Transactions with NexGen or Telcom-ATI Investors or their
affiliates are not covered by this provision.

     Our stock option plan generally provides for assumption of our plan or
substitution of an equivalent option of a successor corporation or,
alternatively, at the discretion of the board of directors, exercise of some or
all of the options stock, including non-vested shares, or acceleration of
vesting of shares issued pursuant to stock grants, upon a change of control or
similar event. The ability to accelerate vesting may make a takeover more
expensive and thus discourage a takeover attempt.

WARRANTS

     As of the date of this prospectus, warrants were outstanding for the
purchase of 2,068,665 shares of common stock. Of these warrants, warrants for
1,000,000 shares are exercisable at a price of $1.60 per share and 175,000
warrants are exercisable at a price of $4.00 per share. 3Com holds the remaining
warrants to purchase 893,665 shares at a price of $.01 per share. The warrants
exercisable for $1.60 per share and the warrants exercisable for $4.00 per share
become exercisable upon completion of this offering assuming the offering price
is at least $6.00 per share and remain exercisable until June 2002. The
remaining warrants become exercisable from time to time upon the satisfaction of
conditions described at page 56 of this prospectus. In addition to the warrants
described above, Merrill Lynch Capital Corporation has warrants, none of which
are currently exercisable, to acquire up to 2,419,690 shares of our common stock
for no consideration. These warrants become void upon the closing of this
offering. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations" on page 28 for a detailed discussion.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for our common stock is BankBoston, N.A.

LISTING

     Our shares of common stock will be quoted on the Nasdaq National Market
under the trading symbol "AETH."

                                       64
<PAGE>   65

                        SHARES ELIGIBLE FOR FUTURE SALE

     Before this offering, there has been no public market for our common stock.
A significant public market for the common stock may not develop or be sustained
after this offering. Future sales of substantial amounts of our common stock in
the public market, or the possibility of these sales occurring, could adversely
affect prevailing market prices for our common stock or our future ability to
raise capital through an offering of equity securities.

     Upon completion of this offering, we will have outstanding 26,066,995
shares of common stock. Of these shares, the 6,000,000 shares to be sold in this
offering (6,900,000 shares if the underwriters' over-allotment option is
exercised in full) will be freely tradable in the public market without
restriction under the Securities Act, unless the shares are held by "affiliates"
of Aether, as that term is defined in Rule 144 under the Securities Act.

     The remaining 20,066,995 shares outstanding upon completion of this
offering will be "restricted securities" as that term is defined under Rule 144.
We issued and sold these restricted securities in private transactions in
reliance on exemptions from registration under the Securities Act. Restricted
securities may be sold in the public market only if they are registered or if
they qualify for an exemption from registration under Rule 144 or Rule 701 under
the Securities Act, as summarized below.

     Pursuant to "lock-up" agreements, all the executive officers, directors and
stockholders of Aether, who hold all of these restricted securities, have agreed
with the underwriters not to offer, sell, contract to sell, grant any option to
purchase or otherwise dispose of any of these shares for a period of 180 days
from the date of this prospectus. We also have entered into an agreement with
the underwriters that we will not offer, sell or otherwise dispose of common
stock for a period of 180 days from the date of this prospectus. However,
Merrill Lynch & Co. may in its sole discretion, at any time without notice,
consent to the release all or any portion of the shares subject to lock-up
agreements.

     Taking into account the lock-up agreements, and assuming Merrill Lynch &
Co. does not release stockholders from these agreements, the following shares
will be eligible for sale in the public market at the following times:

     - on the date of this prospectus, the 6,000,000 shares sold in the offering
       will be immediately available for sale in the public market;

     - 180 days after the date of the prospectus, approximately 19,499,495
       shares will be eligible for sale, 19,441,995 of which will be subject to
       volume, manner of sale and other limitations under Rule 144; and

     - the remaining 567,500 shares will be eligible for sale under Rule 144
       from time to time upon the expiration of various one-year holding periods
       after the expiration of the lock-up period applicable to those shares.

     Following the expiration of the lock-up period, shares issued upon exercise
of options we granted prior to the date of this prospectus will also be
available for sale in the public market pursuant to Rule 701 under the
Securities Act. Rule 701 permits resales of these shares beginning 90 days after
the date of this prospectus by persons other than affiliates. In general, under
Rule 144, after the expiration of the lock-up period, a person who has
beneficially owned restricted securities for at least one year would be entitled
to sell, within any three-month period, a number of shares that does not exceed
the greater of:

     - 1% of the then-outstanding shares of common stock; or

     - the average weekly trading volume of the common stock during the four
       calendar weeks preceding the sale.

     Sales under Rule 144 are also subject to manner of sale and notice
requirements and to the availability of current public information about Aether.
Under Rule 144(k), a person who has not been our affiliate at any time during
the three months before a sale and who has beneficially owned the shares
proposed to be sold for at least two years can sell these shares without
complying with the manner of sale, public information, volume limitation or
notice provisions of Rule 144.

     Through October 20, 1999, we have granted options to purchase 3,007,855
shares of common stock to specified persons pursuant to the option plan of our
limited liability company. We intend to file, after the effective date of this
offering, a registration statement on Form S-8 to register approximately
5,200,000 shares of common stock reserved

                                       65
<PAGE>   66

for issuance under the stock option plan we intend to adopt before completion of
the offering. See "Management -- Executive Compensation" at page 50. The
registration statement will become effective automatically upon filing. Shares
issued under the foregoing plan, after the filing of a registration statement on
Form S-8 may be sold in the open market, subject, in the case of some holders,
to the Rule 144 limitations applicable to affiliates, the lock-up agreements and
vesting restrictions imposed by us.

     In addition, following this offering, the holders of 19,891,995 shares of
outstanding common stock will, under some circumstances, have rights to require
us to register their shares for future sale. See "Description of Capital
Stock -- Registration Rights of Stockholders" at page 62.

                                       66
<PAGE>   67

                                  UNDERWRITING

GENERAL

     We intend to offer our common stock in the United States through a number
of underwriters. Merrill Lynch, Pierce, Fenner & Smith Incorporated, BancBoston
Robertson Stephens Inc., Donaldson, Lufkin & Jenrette Securities Corporation and
U.S. Bancorp Piper Jaffray Inc. are acting as representatives of each of the
underwriters named below. Subject to the terms and conditions set forth in a
purchase agreement among our company and the underwriters, we have agreed to
sell to the underwriters, and each of the underwriters severally and not jointly
has agreed to purchase from our company, the number of shares of common stock
set forth opposite its name below.

<TABLE>
<CAPTION>
                                                                              NUMBER
               U.S. UNDERWRITER                                              OF SHARES
               ----------------                                              ---------
<S>                                                                          <C>
Merrill Lynch, Pierce, Fenner & Smith
               Incorporated................................................  2,510,000
BancBoston Robertson Stephens Inc..........................................  1,485,000
Donaldson, Lufkin & Jenrette Securities Corporation........................    990,000
U.S. Bancorp Piper Jaffray Inc.............................................    495,000
Banc of America Securities LLC.............................................    100,000
E*OFFERING Corp............................................................    100,000
Morgan Stanley & Co. Incorporated..........................................    100,000
First Union Securities, Inc................................................    100,000
PaineWebber Incorporated...................................................    100,000
                                                                             ---------
               Total.......................................................  5,980,000
                                                                             =========
</TABLE>

     We have agreed to sell the additional 20,000 shares offered by this
prospectus directly to one purchaser.

     In the purchase agreement, the several underwriters have agreed, subject to
the terms and conditions set forth in the agreement, to purchase all of the
shares of common stock being sold under the terms of the purchase agreement if
any of the shares of common stock being sold under the terms of the purchase
agreement are purchased. In the event of a default by an underwriter, the
purchase agreement provides that, in certain circumstances, the purchase
commitments of the nondefaulting underwriters may be increased or the purchase
agreement may be terminated.

     We have agreed to indemnify the underwriters against some liabilities,
including some liabilities under the Securities Act, or to contribute to
payments the underwriters may be required to make in respect of those
liabilities.

     The shares of common stock are being offered by the several underwriters,
subject to prior sale, when, as and if issued to and accepted by them, subject
to approval of certain legal matters by counsel for the underwriters and certain
other conditions. The underwriters reserve the right to withdraw, cancel or
modify such offer and to reject orders in whole or in part.

COMMISSIONS AND DISCOUNTS

     The representatives have advised us that the underwriters propose initially
to offer the shares of common stock to the public at the public offering price
set forth on the cover page of this prospectus, and to certain dealers at such
price less a concession not in excess of $.67 per share of common stock. The
underwriters may allow, and such dealers may reallow, a discount not in excess
of $.10 per share of common stock to certain other dealers. After the initial
public offering, the public offering price, concession and discount may be
changed.

                                       67
<PAGE>   68

     The following table shows the per share and the total public offering
price, the underwriting discount to be paid by us to the underwriters and the
proceeds before expenses to us. This information is presented assuming either no
exercise or full exercise by the underwriters of their over-allotment options.

<TABLE>
<CAPTION>
                                                              PER SHARE   WITHOUT OPTION   WITH OPTION
                                                              ---------   --------------   -----------
<S>                                                           <C>         <C>              <C>
Public offering price.......................................   $16.00      $96,000,000     $110,400,000
Underwriting discount.......................................    $1.12       $6,697,600       $7,705,600
Proceeds, before expenses, to Aether Systems................   $14.88      $89,302,400     $102,694,400
</TABLE>

     The expenses of the offering, exclusive of the underwriting discount, are
estimated at $1.3 million and are payable by us.

OVER-ALLOTMENT OPTION

     We have granted an option to the underwriters, exercisable for 30 days
after the date of this prospectus, to purchase up to an aggregate of 900,000
additional shares of our common stock at the public offering price set forth on
the cover page of this prospectus, less the underwriting discount. The
underwriters may exercise this option solely to cover over-allotments, if any,
made on the sale of our common stock offered hereby. To the extent that the
underwriters exercise this option, each underwriter will be obligated, subject
to certain conditions, to purchase a number of additional shares of our common
stock proportionate to such underwriter's initial amount reflected in the
foregoing table.

RESERVED SHARES

     At our request, the underwriters have reserved for sale, at the initial
public offering price, up to 390,000 of the shares offered by this prospectus to
be sold to some of our employees, officers, directors and their immediate family
members. The number of shares of our common stock available for sale to the
general public will be reduced to the extent that those persons purchase the
reserved shares. Any reserved shares which are not orally confirmed for purchase
within one day of the pricing of the offering will be offered by the
underwriters to the general public on the same terms as the other shares offered
by this prospectus.

NO SALES OF SIMILAR SECURITIES

     We and our executive officers and directors and all of our existing
stockholders have agreed, with certain exceptions, without the prior written
consent of Merrill Lynch on behalf of the underwriters for a period of 180 days
after the date of this prospectus, not to directly or indirectly

     - 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 for the sale of, lend or otherwise dispose of or
       transfer any shares of our common stock or securities convertible into or
       exchangeable or exercisable for or repayable with our common stock,
       whether now owned or later acquired by the person executing the agreement
       or with respect to which the person executing the agreement later
       acquires the power of disposition, or file a registration statement under
       the Securities Act relating to any shares of our common stock; or

     - enter into any swap or other agreement that transfers, in whole or in
       part, directly or indirectly, the economic consequence of ownership of
       our common stock whether any such swap or transaction is to be settled by
       delivery of our common stock or other securities, in cash or otherwise.

QUOTATION ON THE NASDAQ NATIONAL MARKET

     Our common stock will be quoted on the Nasdaq National Market under the
symbol "AETH."

     Before this offering, there has been no public market for our common stock.
The initial public offering price has been determined through negotiations
between us and the representatives. Among the factors considered in determining
the initial public offering price, in addition to prevailing market conditions,
were the valuation multiples of publicly traded companies that the
representatives believed to be comparable to us, certain of our financial

                                       68
<PAGE>   69

information, the history of, and the prospects for, our company and the industry
in which we compete, and an assessment of our management, our past and present
operations, the prospects for, and timing of, future revenue of our company, the
present state of our development, and the above factors in relation to market
values and various valuation measures of other companies engaged in activities
similar to ours. There can be no assurance that an active trading market will
develop for our common stock or that our common stock will trade in the public
market subsequent to the offering at or above the initial public offering price.

     The underwriters have advised us that they do not expect sales of the
common stock to any accounts over which they exercise discretionary authority to
exceed 5% of the number of shares being offered in this offering.

NASD REGULATIONS

     We are required, under the terms of our senior secured interim credit
facility with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
Incorporated, one of the underwriters of this offering, and Merrill Lynch
Capital Corporation to apply approximately $14.8 million from the net proceeds
of the offering to repay all amounts outstanding under this facility. Because
more than ten percent of the net proceeds of the offering may be paid to members
or affiliates of members of the National Association of Securities Dealers, Inc.
participating in the offering, the offering has been conducted in accordance
with NASD Conduct Rule 2710(c)(8), which requires that the public offering price
of an equity security be no higher than the price recommended by a qualified
independent underwriter which has participated in the preparation of the
registration statement and performed its usual standard of due diligence with
respect to that registration statement. BancBoston Robertson Stephens Inc. has
agreed to act as qualified independent underwriter with respect to the offering,
and the price of the common stock is no higher than that recommended by
BancBoston Robertson Stephens Inc.

     The underwriters will not confirm sales of the common stock to any account
over which they exercise discretionary authority without the prior written
specific approval of the customer.

PRICE STABILIZATION, SHORT POSITIONS AND PENALTY BIDS

     Until the distribution of our common stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the underwriters and
certain selling group members to bid for and purchase our common stock. As an
exception to these rules, the representatives are permitted to engage in
transactions that stabilize the price of our common stock. Such transactions
consist of bids or purchases for the purpose of pegging, fixing or maintaining
the price of our common stock.

     If the underwriters create a short position in our common stock in
connection with the offering, i.e., if they sell more shares of our common stock
than are set forth on the cover page of this prospectus, the representatives may
reduce that short position by purchasing our common stock in the open market.
The representatives may also elect to reduce any short position by exercising
all or part of the over-allotment option described above.

     The representatives may also impose a penalty bid on underwriters and
selling group members. This means that if the representatives purchase shares of
our common stock in the open market to reduce the underwriters' short position
or to stabilize the price of our common stock, they may reclaim the amount of
the selling concession from the underwriters and selling group members who sold
those shares as part of the offering.

     In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher than
it might be in the absence of such purchases. The imposition of a penalty bid
might also have an effect on the price of our common stock to the extent that it
discourages resales of our common stock.

     Neither our company nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of our common stock. In addition, neither
our company nor any of the underwriters makes any representation that the
representatives will engage in such transactions or that such transactions, once
commenced, will not be discontinued without notice.

                                       69
<PAGE>   70

OTHER RELATIONSHIPS

     On September 28, 1999, we entered into a senior secured interim credit
facility with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
Incorporated and Merrill Lynch Capital Corporation, one of the underwriters of
this offering, under which we borrowed $14.8 million to fund the purchase price
for our acquisition of Mobeo and pay fees and expenses related to the
acquisition and credit facility and for general corporate purposes. Under the
terms of this senior secured interim credit facility, we will use a portion of
the net proceeds of the offering to repay all amounts outstanding under this
facility. In connection with the closing of the credit facility, we also issued
warrants to Merrill Lynch Capital Corporation. If we repay the loan out of the
proceeds of this offering, the warrants shall become void and no shares will be
issued. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations" on page 28. Merrill Lynch received customary compensation
for providing the credit facility. The loan transaction was independent of, and
not contingent upon, the completion of the offering.

     Some of the underwriters and their affiliates may engage in other
transactions with, and perform services for, our company in the ordinary course
of business and have engaged, and may in the future engage, in commercial
banking and investment banking transactions with our company, for which they may
receive customary compensation.

                                 LEGAL MATTERS

     The validity of the common stock offered hereby will be passed upon for
Aether by Wilmer, Cutler & Pickering, Washington, D.C. George P. Stamas, a
partner at Wilmer, Cutler & Pickering, is a director of Aether. Mr. Stamas owns
options to purchase 11,250 shares of common stock, and he holds a non-voting
interest in Telcom-ATI Investors. Certain legal matters in connection with this
offering will be passed upon for the underwriters by Hogan & Hartson L.L.P.,
Washington, D.C.

                                    EXPERTS

     The financial statements and schedule of Aether Technologies International,
L.L.C. as of December 31, 1997 and 1998, and for each of the years in three-year
period ended December 31, 1998 have been included herein and in the registration
statement in reliance upon the reports of KPMG LLP, independent certified public
accountants, appearing elsewhere herein, and upon the authority of said firm as
experts in accounting and auditing.

     The financial statements of Mobeo, Inc. as of December 31, 1997 and 1998
and for each of the three years in the period ended December 31, 1998, included
in this prospectus, have been included in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
that firm as experts in auditing and accounting.

                      WHERE YOU CAN FIND MORE INFORMATION

     We have filed with the SEC a registration statement on Form S-1 under the
Securities Act with respect to the common stock offered by this prospectus. This
prospectus does not contain all of the information contained in the registration
statement, and the exhibits and schedules to the registration statement portions
of which are omitted as permitted by the rules and regulations of the SEC. For
further information with respect to us and our common stock, we refer you to the
registration statement, and the exhibits and schedules filed as part of the
registration statement. Statements in this prospectus concerning the contents of
any contract or any other document are not necessarily complete. If a contract
or document has been filed as an exhibit to the registration statement, we refer
you to that exhibit. Each statement in this prospectus relating to a contract or
document filed as an exhibit to the registration statement is qualified by the
filed exhibits.

     In addition, after the offering, we will file reports, proxy statements and
other information with the SEC. You may read and copy any document we file,
including the registration statement, at the SEC's public reference rooms in
Washington, D.C., New York, New York and Chicago, Illinois. Please call the SEC
at 1-800-SEC-0330 for further information on the public reference rooms. Our SEC
filings are also available to the public on the SEC's website at
http://www.sec.gov.

     You should rely only on the information contained in this prospectus. We
have not, and the underwriters have not, authorized any other person to provide
you with different information. If anyone provides you with different or
                                       70
<PAGE>   71

inconsistent information, you should not rely on it. We are not, and the
underwriters are not, making an offer to sell these securities in any
jurisdiction where the offer or sale is not permitted. You should assume that
the information appearing in this prospectus is accurate only as of the date on
the front cover of this prospectus. Our business, financial condition, results
of operations and prospects may have changed since that date.

                                       71
<PAGE>   72

                         INDEX TO FINANCIAL STATEMENTS

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Independent Auditors' Report................................  F-2
Balance Sheets as of December 31, 1997 and 1998 and June 30,
  1999 (unaudited)..........................................  F-3
Statements of Operations and Other Comprehensive Loss for
  the years ended December 31, 1996, 1997 and 1998, and for
  the six months ended June 30, 1998 and 1999 (unaudited)...  F-4
Statements of Members' Capital for the years ended December
  31, 1996, 1997 and 1998, and for the six months ended June
  30, 1999 (unaudited)......................................  F-5
Statements of Cash Flows for the years ended December 31,
  1996, 1997 and 1998 and for the six months ended June 30,
  1998 and 1999 (unaudited).................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>

                                  MOBEO, INC.

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................  F-17
Balance Sheets as of December 31, 1997 and 1998 and June 30,
  1999 (unaudited)..........................................  F-18
Statements of Operations for the years ended December 31,
  1996, 1997 and 1998 and for the six months ended June 30,
  1998 and June 30, 1999 (unaudited)........................  F-19
Statements of Changes in Stockholders' Equity (Deficit) for
  the years ended December 31, 1996, 1997 and 1998 and for
  the six months ended June 30, 1999 (unaudited)............  F-20
Statements of Cash Flows for the years ended December 31,
  1996, 1997 and 1998 and for the six months ended June 30,
  1998 and June 30, 1999 (unaudited)........................  F-21
Notes to Financial Statements...............................  F-22
</TABLE>

                         UNAUDITED PRO FORMA CONDENSED
                       CONSOLIDATED FINANCIAL INFORMATION

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Description of Unaudited Pro Forma Condensed Consolidated
  Financial Information.....................................  F-29
Unaudited Pro Forma Condensed Consolidated Balance Sheet as
  of June 30, 1999..........................................  F-30
Unaudited Pro Forma Condensed Consolidated Statement of
  Operations for the six months ended
  June 30, 1999.............................................  F-32
Unaudited Pro Forma Condensed Consolidated Statement of
  Operations for the year ended
  December 31, 1998.........................................  F-33
</TABLE>

- ---------------
* Aether Systems, Inc. was formed on August 17, 1999 and has not been
  capitalized. Financial statements of Aether Systems, Inc. have not been
  presented herein because Aether Systems, Inc. has no significant assets,
  liabilities (actual or contingent), or operations and such financial
  statements are, therefore, not material to this Registration Statement or
  investors' understanding of the Offering.

                                       F-1
<PAGE>   73

                          INDEPENDENT AUDITORS' REPORT

The Members' Committee
Aether Technologies International, L.L.C.:

     We have audited the accompanying balance sheets of Aether Technologies
International, L.L.C. as of December 31, 1997 and 1998, and the related
statements of operations and other comprehensive loss, members' capital and cash
flows for each of the years in the three-year period ended December 31, 1998.
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, the financial statements referred to above present fairly,
in all material respects, the financial position of Aether Technologies
International, L.L.C. as of December 31, 1997 and 1998, and the results of its
operations and its cash flows for each of the years in the three-year period
ended December 31, 1998, in conformity with generally accepted accounting
principles.

                                      /s/ KPMG LLP

Washington, D.C.
February 25, 1999

                                       F-2
<PAGE>   74

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                                 BALANCE SHEETS

                                     ASSETS

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              ---------------------    JUNE 30,
                                                                1997        1998         1999
                                                              --------   ----------   -----------
                                                                                      (UNAUDITED)
<S>                                                           <C>        <C>          <C>
Current assets:
  Cash and cash equivalents.................................  $132,262   $1,755,350   $  457,305
  Short-term investments....................................     5,852    6,191,287    3,957,602
  Trade accounts receivable, net of allowance for doubtful
     accounts of $0, $157,061 and $72,006 at December 31,
     1997 and 1998 and June 30, 1999 (unaudited),
     respectively...........................................   122,133      118,489      124,873
  Inventory, net of allowance for obsolescence of $0,
     $169,630 and $85,846 at December 31, 1997 and 1998 and
     June 30, 1999 (unaudited), respectively................        --      143,617       88,368
  Prepaid expenses and other current assets.................    15,117       45,646       71,816
                                                              --------   ----------   ----------
          Total current assets..............................   275,364    8,254,389    4,699,964
Furniture, computers, and equipment, net....................   546,848      510,437    1,166,849
                                                              --------   ----------   ----------
                                                              $822,212   $8,764,826   $5,866,813
                                                              ========   ==========   ==========

                                LIABILITIES AND MEMBERS' CAPITAL
Current liabilities:
  Accounts payable..........................................  $112,509   $  195,930   $  347,919
  Accrued expenses..........................................   260,590      288,350      525,973
  Accrued employee compensation and benefits................    62,278      250,975      127,039
  Deferred revenue..........................................   162,500           --       25,000
                                                              --------   ----------   ----------
          Total current liabilities.........................   597,877      735,255    1,025,931
Note payable to member......................................   150,000           --           --
Members' capital............................................    74,335    8,029,571    4,840,882
                                                              --------   ----------   ----------
Commitments and contingencies (notes 1, 7 and 9)
                                                              $822,212   $8,764,826   $5,866,813
                                                              ========   ==========   ==========
</TABLE>

                See accompanying notes to financial statements.

                                       F-3
<PAGE>   75

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

             STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE LOSS

<TABLE>
<CAPTION>
                                                                                       SIX MONTHS ENDED
                                                 YEAR ENDED DECEMBER 31,                   JUNE 30,
                                         ---------------------------------------   -------------------------
                                            1996          1997          1998          1998          1999
                                         -----------   -----------   -----------   -----------   -----------
                                                                                          (UNAUDITED)
<S>                                      <C>           <C>           <C>           <C>           <C>
Subscriber revenue.....................  $        --   $   161,400   $   549,057   $   124,576   $   598,810
Engineering services revenue...........    1,355,011     1,624,733       963,165       436,090       188,274
                                         -----------   -----------   -----------   -----------   -----------
          Total revenue................    1,355,011     1,786,133     1,512,222       560,666       787,084
Cost of subscriber revenue.............           --       447,480       797,165       199,559       530,823
Cost of engineering services revenue...    1,006,944       846,140       304,137       170,812       119,829
                                         -----------   -----------   -----------   -----------   -----------
          Total cost of revenue........    1,006,944     1,293,620     1,101,302       370,371       650,652
                                         -----------   -----------   -----------   -----------   -----------
          Gross profit.................      348,067       492,513       410,920       190,295       136,432
                                         -----------   -----------   -----------   -----------   -----------
Operating expenses:
  Research and development.............      160,597       733,630     1,267,320       589,148     1,002,107
  General and administrative...........      395,209     1,504,250     2,773,332     1,273,189     1,582,600
  Selling and marketing................           --       333,191       840,455       313,775       555,428
  Depreciation and amortization........       45,245       189,160       264,685       123,820       193,523
  Unit option and warrant expense......           --        40,277        32,580        16,290     1,263,150
                                         -----------   -----------   -----------   -----------   -----------
                                             601,051     2,800,508     5,178,372     2,316,222     4,596,808
                                         -----------   -----------   -----------   -----------   -----------
          Operating loss...............     (252,984)   (2,307,995)   (4,767,452)   (2,125,927)   (4,460,376)
Other income (expense):
  Interest income (expense), net.......        8,491         7,788        74,180         7,035       140,753
  Equity in losses of investments......     (172,487)     (144,825)           --            --            --
  Realized loss on sale of
     investment........................           --      (302,145)           --            --            --
                                         -----------   -----------   -----------   -----------   -----------
          Net loss.....................  $  (416,980)  $(2,747,177)  $(4,693,272)  $(2,118,892)  $(4,319,623)
                                         -----------   -----------   -----------   -----------   -----------
Other comprehensive loss-unrealized
  holding loss on investments available
  for sale.............................           --            --       (58,030)           --      (132,216)
                                         -----------   -----------   -----------   -----------   -----------
Comprehensive loss.....................  $  (416,980)  $(2,747,177)  $(4,751,302)  $(2,118,892)  $(4,451,839)
                                         ===========   ===========   ===========   ===========   ===========
Pro forma statement of operations data
  (unaudited):
  Loss before income taxes, as
     reported..........................  $  (416,980)  $(2,747,177)  $(4,693,272)  $(2,118,892)  $(4,319,623)
  Pro forma income tax provision
     (benefit).........................           --            --            --            --            --
                                         -----------   -----------   -----------   -----------   -----------
  Pro forma net loss...................  $  (416,980)  $(2,747,177)  $(4,693,272)  $(2,118,892)  $(4,319,623)
                                         ===========   ===========   ===========   ===========   ===========
  Pro forma net loss per share-basic
     and diluted.......................  $     (0.04)  $     (0.22)  $     (0.29)  $     (0.15)  $     (0.22)
                                         ===========   ===========   ===========   ===========   ===========
  Pro forma weighted average shares
     outstanding-basic and diluted.....   10,554,795    12,655,901    15,916,383    14,270,568    19,877,855
                                         ===========   ===========   ===========   ===========   ===========
</TABLE>

                See accompanying notes to financial statements.

                                       F-4
<PAGE>   76

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                         STATEMENTS OF MEMBERS' CAPITAL

<TABLE>
<CAPTION>
                                                                                   UNREALIZED
                                                          MEMBER      MEMBERS'       LOSS ON
                                                           UNITS       CAPITAL     INVESTMENTS      TOTAL
                                                         ---------   -----------   -----------   -----------
<S>                                                      <C>         <C>           <C>           <C>
Balance at January 1, 1996.............................         --   $        --    $      --    $        --
  Issuance of member units in January 1996.............  3,000,000        17,846           --         17,846
  Issuance of member units in January 1996.............  1,000,000     1,000,000           --      1,000,000
  Issuance of member units in May 1996.................    500,000       500,000           --        500,000
  Net loss.............................................         --      (416,980)          --       (416,980)
                                                         ---------   -----------    ---------    -----------
Balance at December 31, 1996...........................  4,500,000     1,100,866           --      1,100,866
  Issuance of member units in February 1997............    625,000     1,000,000           --      1,000,000
  Issuance of member units in December 1997............    230,123       690,369           --        690,369
  Unit option and warrant expense......................         --        40,277           --         40,277
  Note receivable from member..........................         --       (10,000)          --        (10,000)
  Net loss.............................................         --    (2,747,177)          --     (2,747,177)
                                                         ---------   -----------    ---------    -----------
Balance at December 31, 1997...........................  5,355,123        74,335           --         74,335
  Issuance of member units in January 1998.............    401,961     1,499,314           --      1,499,314
  Issuance of warrants in June 1998....................         --        50,000           --         50,000
  Exercise of warrants in August 1998..................      5,656            56           --             56
  Conversion of note payable and issuance of member
     units in August 1998..............................     57,180       252,467           --        252,467
  Issuance of member units in August 1998..............  1,131,222     5,000,000           --      5,000,000
  Issuance of member units in October 1998.............  1,000,000     6,000,000           --      6,000,000
  Unit option and warrant expense......................         --        32,580           --         32,580
  Unrealized loss on investment available for sale.....         --            --      (58,030)       (58,030)
  Note receivable from member..........................         --      (127,879)          --       (127,879)
  Net loss.............................................         --    (4,693,272)          --     (4,693,272)
                                                         ---------   -----------    ---------    -----------
Balance at December 31, 1998...........................  7,951,142     8,087,601      (58,030)     8,029,571
  Unrealized loss on investment available for sale
     (unaudited).......................................         --            --     (132,216)      (132,216)
  Unit option and warrant expense (unaudited)..........         --     1,263,150           --      1,263,150
  Net loss (unaudited).................................         --    (4,319,623)          --     (4,319,623)
                                                         ---------   -----------    ---------    -----------
Balance at June 30, 1999 (unaudited)...................  7,951,142   $ 5,031,128    $(190,246)   $ 4,840,882
                                                         =========   ===========    =========    ===========
</TABLE>

                See accompanying notes to financial statements.

                                       F-5
<PAGE>   77

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS ENDED
                                                            YEAR ENDED DECEMBER 31,                   JUNE 30,
                                                    ---------------------------------------   -------------------------
                                                       1996          1997          1998          1998          1999
                                                    -----------   -----------   -----------   -----------   -----------
                                                                                                     (UNAUDITED)
<S>                                                 <C>           <C>           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss........................................  $  (416,980)  $(2,747,177)  $(4,693,272)  $(2,118,892)  $(4,319,623)
  Adjustments to reconcile net loss to net cash
    used by operating activities:
    Depreciation and amortization.................       45,245       189,160       264,685       123,820       193,523
    Provision (recovery) for doubtful accounts....           --            --       157,061        25,394       (85,055)
    Provision for inventory obsolescence..........           --            --       169,630            --            --
    Realized (gain) loss on sale of short-term
      investments.................................           --            --        (3,872)           --        11,882
    Equity in losses of investments...............      172,487       144,825            --            --            --
    Realized loss on sale of investment...........           --       302,145            --            --            --
    Issuance of warrants..........................           --            --        50,000         8,693            --
    Unit option and warrant expense...............           --        40,277        32,580        16,290     1,263,150
    Changes in assets and liabilities:
      (Increase) decrease in trade accounts
         receivable...............................     (223,402)       74,812      (153,417)      (48,953)       78,671
      (Increase) decrease in inventory............           --            --      (313,247)           --        55,249
      (Increase) decrease in prepaid expenses and
         other current assets.....................      (18,945)        3,828       (30,529)       (8,694)      (26,170)
      Increase in accounts payable................       45,149        67,360        83,421       160,854       151,989
      Increase in accrued expenses and employee
         compensation and benefits................       50,246       272,622       216,457       137,349       113,687
      Increase (decrease) in deferred revenue.....           --       162,500      (162,500)     (162,500)       25,000
                                                    -----------   -----------   -----------   -----------   -----------
         Net cash used by operating activities....     (346,200)   (1,489,648)   (4,383,003)   (1,866,639)   (2,537,697)
                                                    -----------   -----------   -----------   -----------   -----------
Cash flows (used) by investing activities:
  Sales of short-term investments.................           --        49,977     1,295,525           (99)    7,028,317
  Purchases of short-term investments.............      (55,829)           --    (7,535,118)           --    (4,938,730)
  Purchases of property and equipment.............     (321,707)     (441,700)     (228,274)      (63,444)     (849,935)
  Long-term investments...........................     (775,000)      (23,000)           --            --            --
  Proceeds from sale of investment in joint
    venture.......................................           --       205,000            --            --            --
                                                    -----------   -----------   -----------   -----------   -----------
         Net cash (used) provided in investing
           activities.............................   (1,152,536)     (209,723)   (6,467,867)      (63,543)    1,239,652
                                                    -----------   -----------   -----------   -----------   -----------
Cash flows provided by financing activities:
  Issuance of member units........................    1,500,000     1,690,369    12,501,781     1,499,315            --
  Advances (repayments) from member...............       50,000       (50,000)           --            --            --
  Proceeds from note payable......................           --       150,000       500,000       500,000            --
  Due to related parties..........................           --            --            --       224,371            --
  Repayments on notes payable.....................           --            --      (400,000)           --            --
  Issuance of notes receivable to member..........           --       (10,000)     (127,879)           --            --
  Exercise of warrants............................           --            --            56            --            --
                                                    -----------   -----------   -----------   -----------   -----------
         Net cash provided by financing
           activities.............................    1,550,000     1,780,369    12,473,958     2,223,686            --
                                                    -----------   -----------   -----------   -----------   -----------
         Net increase (decrease) in cash and cash
           equivalents............................       51,264        80,998     1,623,088       293,504    (1,298,045)
Cash and cash equivalents, at beginning of
  period..........................................           --        51,264       132,262       132,262     1,755,350
                                                    ===========   ===========   ===========   ===========   ===========
Cash and cash equivalents, at end of period.......  $    51,264   $   132,262   $ 1,755,350   $   425,766   $   457,305
                                                    ===========   ===========   ===========   ===========   ===========
Supplemental disclosure of cash flow information:
  Cash paid during the year for interest..........  $        --   $     3,894   $    20,171   $        --   $        --
                                                    ===========   ===========   ===========   ===========   ===========
</TABLE>

- ---------------
Supplemental disclosure of noncash investing and financing activities:
    In 1996, a member contributed equipment with an historical cost basis of
     $17,846 to the Company.
    In 1996, the Company made a $48,000 investment in Navox, Inc. of which
     $23,000 was not paid until January 1997.
    In 1997, the Company made an additional $26,457 investment in Navox, Inc. by
     forgiving a trade account receivable of an equal amount.
    In 1998, a member converted a $250,000 promissory note payable into
     membership units.
    At December 31, 1998 and June 30, 1999 (unaudited), the Company incurred an
     unrealized holding loss associated with its investment available for sale
     totaling $58,030 and $132,216. These amounts have been reported as a
     reduction in members' capital.

                See accompanying notes to financial statements.

                                       F-6
<PAGE>   78

                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                         NOTES TO FINANCIAL STATEMENTS
(1)  ORGANIZATION AND DESCRIPTION OF BUSINESS

     Aether Technologies International, L.L.C. (the Company), a Delaware limited
liability company, was originally formed as Aeros, L.L.C. pursuant to the terms
of the Limited Liability Company Agreement of Aeros, L.L.C. (the Agreement) in
January 1996. The Company changed its name to Aether Technologies International,
L.L.C. in August 1996.

     Pursuant to the terms of the Agreement, no member shall be personally
liable for any debt, obligation, or liability of the Company, whether that
liability or obligation arises in contract, tort, or otherwise. Additionally,
the Agreement shall terminate on December 31, 2035 unless extended or sooner
terminated.

     The Company designs, develops, sells and supports wireless data services
and systems enabling people to use wireless handheld devices for data
communications and transactions. The Company operates in a highly competitive
environment subject to rapid technological change and emergence of new
technology. Although management believes its services are transferable to
emerging technologies, rapid changes in technology could have an adverse
financial impact on the Company.

     The Company expects to expand its operations through continued capital
investment in new systems and services. The Company is not currently generating
sufficient cash flows from operations to support its current operating and
capital requirements. The Company has and will continue to be dependent upon its
members and other financing sources to fund these requirements.

(2)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  (a) Revenue Recognition

     The Company derives subscriber revenue from the provision of real-time
access to information from selected financial markets integrated into existing
wireless communication platforms. Subscriber revenue consists of monthly fixed
charges for usage and equipment and is recognized as the service is provided on
a monthly basis and a one time non-refundable activation fee which is recognized
upon service activation. Direct activation costs are expensed as incurred. Also
included in subscriber revenue are market exchange fees for access to financial
information from the securities exchanges and markets, which are recognized as
the service is provided. Engineering services revenue is derived from the
provision of wireless integration consulting under time-and-materials and
fixed-fee contracts. Revenue on time-and-materials contracts is recognized as
services are performed. Revenue on fixed-fee contracts is recognized on the
percentage-of-completion method based on costs incurred in relation to total
estimated costs. Anticipated contract losses are recognized as soon as they
become known and estimable.

  (b) Cost of Revenues

     Cost of subscriber revenue consists primarily of airtime costs, financial
data costs, wireless handheld device costs, and securities and market exchange
fees. Cost of engineering services revenue consists of cash compensation and
related costs for engineering personnel and materials.

  (c) Cash and Cash Equivalents

     Cash equivalents include all highly liquid investments purchased with
original maturities of three months or less. Cash equivalents consist of
approximately $132,000, $193,000 and $299,000 in overnight repurchase agreements
and $0, $1,562,000 and $139,000 in money market accounts, at December 31, 1997
and 1998, and June 30, 1999 (unaudited) respectively.

  (d) Short-term Investments

     Short-term investments consist of highly liquid investments with original
maturities greater than three months and less than one year and those
longer-term investments that the Company expects to liquidate within twelve
months. The Company has classified its short-term investments as "available for
sale" and
                                       F-7
<PAGE>   79
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

carries such investments at fair value. Unrealized gains (losses) are excluded
from earnings and are reported as a separate component of other comprehensive
income until realized. Realized gains and losses from the sale of these
investments are determined on a specific identification basis.

  (e) Fair Value of Financial Instruments

     The carrying amounts of the Company's financial instruments, which include
cash equivalents, accounts receivable, accounts payable and accrued expenses
approximate their fair values.

  (f) Concentration of Credit Risk

     Financial instruments that potentially subject the Company to a
concentration of credit risk consist of accounts receivable. The Company extends
credit to its customers on an unsecured basis in the normal course of business.

  (g) Inventory

     Inventory, net of allowance for obsolete and slow-moving inventory,
consists primarily of handheld and laptop computers, wireless modems, and
accessories and is stated at the lower of cost or market. Cost is determined
using the first-in, first-out (FIFO) method. The inventory of the Company is
subject to rapid technological changes which could have an adverse impact on its
realization in future periods. In addition, there are a limited number of
suppliers of the Company's inventory.

  (h) Furniture, Computers and Equipment

     Furniture, computers, and equipment are stated at cost. Depreciation is
calculated using the straight-line method over the estimated useful lives of the
assets, which range from three to seven years. The costs of leasehold
improvements are capitalized and amortized using the straight-line method over
the lesser of the lease term or the estimated useful life of the asset.

  (i) Investments

     The Company uses the equity method of accounting for advances to and
earnings and losses of its investments.

  (j) Recovery of Long-Lived Assets

     The Company's policy is to review its long-lived assets for impairment
whenever events or changes in circumstances indicate that the carrying amount
may not be recoverable. The Company recognizes an impairment loss when the sum
of the expected future cash flows is less than the carrying amount of the asset.
The measurement of the impairment losses to be recognized is based upon the
difference between the fair value and the carrying amount of the assets.

  (k) Unit Options and Warrants

     The Company accounts for equity-based compensation arrangements in
accordance with the provisions of Accounting Principle Board ("APB") Opinion No.
25, "Accounting for Stock Issued to Employees," and related interpretations, and
complies with the disclosure provisions of Statement of Financial Accounting
Standards ("SFAS") No. 123, "Accounting for Stock-Based Compensation." Under APB
No. 25, compensation expense is based upon the difference, if any, on the date
of grant, between the fair value of the Company's stock and the exercise price.
All equity-based awards to non-employees are accounted for at their fair value
in accordance with SFAS No. 123.

  (l) Pro Forma Statements of Operations Data and Net Loss Per Share (Unaudited)

     Prior to the closing of the Company's proposed initial public offering,
each member of the Company will contribute its membership units in the Company
to Aether Systems, Inc. in exchange for 2.5 shares of

                                       F-8
<PAGE>   80
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

common stock of Aether Systems, Inc. Following such contribution, the Company
will merge with and into Aether Systems, Inc., as a result of which all assets
and liabilities of the Company will be transferred to Aether Systems, Inc.
Aether Systems, Inc. will be subject to Federal and state taxes at prevailing
corporate rates. Accordingly, pro forma statements of operations data is based
on the assumption that the Company's merger with and into Aether Systems, Inc.,
had occurred at the beginning of each period. The Company has provided no income
taxes on a pro forma basis due to the losses incurred in all periods.

     The Company computes net income (loss) per share in accordance with SFAS
No. 128, "Earnings Per Share," and SEC Staff Accounting Bulletin No. 98 ("SAB
98"). Under the provisions of SFAS No. 128 and SAB 98, basic net income (loss)
per share is computed by the dividing the net income (loss) available to common
stockholders for the period by the weighted average number of common shares
outstanding during the period. Diluted net income (loss) per share is computed
by dividing the net income (loss) for the period by the weighted average number
of common and dilutive common equivalent shares outstanding during the period.
Pro forma basic and diluted net loss per share has been calculated assuming that
the capital structure established at the date of the proposed initial public
offering was in effect during the periods presented. As the Company had a net
loss in each of the periods presented, pro forma basic and diluted net loss per
share are the same.

  (m) Research and Development

     Research and development costs are expensed as incurred.

  (n) Advertising Expense

     Advertising costs are expensed as incurred. Advertising expense was
approximately $0, $248,000, and $504,000 for the years ended December 31, 1996,
1997 and 1998, respectively.

  (o) Income Taxes

     The Company has elected limited liability company status and, as such, is
not directly subject to federal and state income taxes. Instead, the members are
responsible for income taxes on their proportionate share of taxable income.
Members are also entitled to a proportionate share of tax deductions and
credits.

  (p) Use of 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 and liabilities and
disclosure of contingent assets and liabilities at the dates of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.

  (q) Other Comprehensive Loss

     Effective January 1, 1998, the Company adopted SFAS No. 130, "Reporting
Comprehensive Income", which established standards for reporting and displaying
comprehensive income and its components in financial statements. Comprehensive
income, as defined, includes changes in equity of a business enterprise during a
period from transactions and other events and circumstances from non-owner
sources. Other comprehensive income refers to revenue, expenses, gains and
losses that under generally accepted accounting principles are included in
comprehensive income, but excluded from net income.

     During 1998 and for the six months ended June 30, 1999 (unaudited), other
comprehensive income (loss) consists of unrealized losses on investments
available for sale.

                                       F-9
<PAGE>   81
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

  (r) Unaudited Interim Financial Information

     The unaudited interim financial information as of June 30, 1999 and for the
six months ended June 30, 1998 and June 30, 1999, have been prepared in
accordance with generally accepted accounting principles for interim financial
information and with instructions to Article 10 of Regulation S-X. In the
opinion of management, such information contains all adjustments, consisting of
only normal recurring adjustments, considered necessary for a fair presentation
of such periods. The operating results for any interim period are not
necessarily indicative of results for any future periods.

  (s) Recent Accounting Pronouncements

     In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities. The new standard establishes accounting and
reporting standards for derivative instruments, including certain derivative
instruments embedded in other contracts and for hedging activities. This
statement, as amended, is effective for all fiscal quarters beginning after June
15, 2000. The Company does not expect SFAS No. 133 to have a material affect on
its financial position or results of operations.

(3)  SHORT-TERM INVESTMENTS

     As of December 31, 1998, short-term available-for-sale investments
consisted of:

<TABLE>
<CAPTION>
                                                     GROSS              GROSS
                                   AMORTIZED       UNREALIZED         UNREALIZED         FAIR
                                      COST       HOLDING GAINS      HOLDING LOSSES      VALUE
                                   ----------   ----------------   ----------------   ----------
<S>                                <C>          <C>                <C>                <C>
U.S. Treasury securities.........  $1,929,810       $    --            $(21,677)      $1,908,133
Corporate debt securities........   4,319,507        11,881             (48,234)       4,283,154
                                   ----------       -------            --------       ----------
                                   $6,249,317       $11,881            $(69,911)      $6,191,287
                                   ==========       =======            ========       ==========
</TABLE>

     Maturities of debt securities classified as available-for-sale were as
follows at December 31, 1998:

<TABLE>
<CAPTION>
                                                              AMORTIZED       FAIR
                                                                 COST        VALUE
                                                              ----------   ----------
<S>                                                           <C>          <C>
Due within one year.........................................  $2,124,838   $2,129,084
Due after one year through five years.......................   1,184,890    1,157,964
Due after five years through ten years......................   1,435,695    1,412,043
Due after ten years.........................................   1,503,894    1,492,196
                                                              ----------   ----------
                                                              $6,249,317   $6,191,287
                                                              ==========   ==========
</TABLE>

     As of June 30, 1999 (unaudited), short-term available-for-sale investments
consisted of:

<TABLE>
<CAPTION>
                                                     GROSS              GROSS
                                   AMORTIZED       UNREALIZED         UNREALIZED         FAIR
                                      COST       HOLDING GAINS      HOLDING LOSSES      VALUE
                                   ----------   ----------------   ----------------   ----------
<S>                                <C>          <C>                <C>                <C>
U.S. Treasury securities.........  $1,770,135        $   --           $ (87,100)      $1,683,035
Corporate debt securities........   2,377,713         3,969            (107,115)       2,274,567
                                   ----------        ------           ---------       ----------
                                   $4,147,848        $3,969           $(194,215)      $3,957,602
                                   ==========        ======           =========       ==========
</TABLE>

                                      F-10
<PAGE>   82
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

     Maturities of debt securities classified as available-for-sale were as
follows at June 30, 1999 (unaudited):

<TABLE>
<CAPTION>
                                                              AMORTIZED       FAIR
                                                                 COST        VALUE
                                                              ----------   ----------
<S>                                                           <C>          <C>
Due within one year.........................................  $  725,593   $  700,563
Due after one year through five years.......................   1,904,049    1,816,065
Due after five years through ten years......................     909,142      836,928
Due after ten years.........................................     609,064      604,046
                                                              ----------   ----------
                                                              $4,147,848   $3,957,602
                                                              ==========   ==========
</TABLE>

(4)  FURNITURE, COMPUTERS AND EQUIPMENT

     Furniture, computers and equipment consisted of the following:

<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                           ESTIMATED     ---------------------   JUNE 30, 1999
                                          USEFUL LIVES     1997        1998       (UNAUDITED)
                                          ------------   ---------   ---------   -------------
<S>                                       <C>            <C>         <C>         <C>
Furniture and fixtures..................    7 Years      $  88,670   $ 102,345    $  258,361
Computer and equipment..................    3 Years        477,306     684,328       919,632
Software................................    3 Years        175,000     175,000       175,000
Leasehold improvements..................    5 Years         40,277      47,854       506,469
                                                         ---------   ---------    ----------
                                                           781,253   1,009,527     1,859,462
Less depreciation and amortization......                  (234,405)   (499,090)     (692,613)
                                                         ---------   ---------    ----------
                                                         $ 546,848   $ 510,437    $1,166,849
                                                         =========   =========    ==========
</TABLE>

(5)  NOTES PAYABLE TO MEMBER

     The Company had an unsecured note payable of $150,000 as of December 31,
1997 due to one of its members, Telcom Ventures LLC (Telcom Ventures). The note
carried interest at a rate of 7.5 percent and all principal and accrued interest
was due in January 1999, or earlier upon the occurrence of specified criteria.
The note payable, plus accrued interest, was repaid in 1998.

     In June 1998, the Company borrowed $250,000 from one of its members,
Pyramid Ventures, Inc. (Pyramid) under a convertible promissory note. The note
was unsecured, bore interest at 8 percent per annum, and was convertible into
membership units at the option of the member. In August 1998, the member elected
to convert the note and accrued interest of $2,467 into 57,180 membership units
in accordance with its terms.

     In June 1998, the Company borrowed $250,000 from another one of its
members, Telcom Ventures, under a similar convertible promissory note. All
principal and accrued interest was paid by the Company in August 1998.

     In connection with the convertible promissory notes, the Company granted
warrants to purchase 5,656 member units at an exercise price of $0.01 per unit
to Pyramid and Telcom Ventures (note 9). The estimated value of the warrants on
the grant date of $50,000 has been recognized in interest expense in 1998.
Pyramid exercised its warrants to purchase 5,656 member units in August 1998.

(6)  MEMBERS' CAPITAL

     Pursuant to the Agreement, the Company was formed with an initial
capitalization of 4,000,000 units. As of December 31, 1998, the Agreement was
modified to increase the capitalization of the Company to 10,000,000 units (note
12).

                                      F-11
<PAGE>   83
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

     In January 1996, NexGen Technologies, L.L.C. (NexGen) contributed assets in
the wireless data field with a historical cost basis of $17,846 to the Company
in exchange for 3,000,000 units and Transettlements, Inc. (Transettlements)
contributed $1,000,000 in exchange for 1,000,000 units. In May 1996,
Transettlements contributed an additional $500,000 in exchange for an additional
500,000 units.

     In February 1997, Telcom Ventures contributed $1,000,000 to the Company in
exchange for 625,000 units. In December 1997, Telcom Ventures contributed an
additional $690,369 to the Company in exchange for 230,123 units.

     In January 1998, Pyramid acquired 401,961 units from the Company for total
proceeds to the Company of $1,499,314.

     In August 1998, Reuters Market Clip Holdings SARL (Reuters) contributed
$5,000,000 to the Company in exchange for 1,131,222 units.

     In November 1998, 3Com Corporation (3Com) contributed $6,000,000 in
exchange for 1,000,000 units.

     There were, 5,355,123, 7,951,142 and 7,951,142 (unaudited) units issued and
outstanding as of December 31, 1997, 1998, and June 30, 1999 (unaudited),
respectively. An additional 685,000 units were reserved for issuance under the
Company's unit option plan as of December 31, 1998 (note 9).

(7)  LEASES

     The Company is obligated under three noncancelable operating leases for
office space, that expire at various dates through 2003. Future minimum lease
payments under noncancelable operating leases are approximately as follows:

<TABLE>
<CAPTION>
                  YEAR ENDING DECEMBER 31,
                  ------------------------
<S>                                                           <C>
1999........................................................  $163,000
2000........................................................   154,000
2001........................................................   164,000
2002........................................................   163,000
2003........................................................   167,000
                                                              --------
Total minimum lease payments................................  $811,000
                                                              ========
</TABLE>

     Rent expense under operating leases was approximately $49,000, $84,000, and
$91,000 for the years ended December 31, 1996, 1997 and 1998, respectively.

(8)  PENSION PLAN

     The Company has a defined contribution plan under Section 401(k) of the
Internal Revenue Code that provides for voluntary employee contributions of 1 to
15 percent of compensation for substantially all employees. The Company does not
contribute to the plan.

(9)  UNIT OPTIONS AND WARRANTS

  (a) Unit Options

     In 1996, the Company adopted a Unit Option Plan (the Plan). As of December
31, 1998, the Plan provides for the issuance of a maximum of 685,000 units by
the Company to its employees (note 12). Options under the Plan generally expire
after ten years and normally vest over a period of up to three years. Options
are generally granted at an exercise price equal to the fair value on the grant
date, as determined by the members.

                                      F-12
<PAGE>   84
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

     The Company recorded unit option and warrant expense of $0, $40,277, and
$32,580 in 1996, 1997, and 1998, respectively, to reflect the difference between
the exercise price and the fair market value of the units at the date of grant
(note 12).

     The Company applies APB 25 and related interpretations in accounting for
its unit option plan. Had compensation cost been recognized consistent with SFAS
123, the Company's net loss would have increased by $21,000, $24,000, and
$41,000 for 1996, 1997, and 1998, respectively.

     The per share weighted-average value of unit options issued by the Company
during 1996, 1997, and 1998 was $0.17, $0.16, and $0.55, respectively, on the
date of grant using the Black-Scholes option-pricing model. These amounts were
calculated using an expected option life of 3 years and volatility of zero. In
addition, the calculations assumed a risk-free interest rate of 6.22 percent in
1996, 5.77 percent to 6.25 percent in 1997, and 4.55 percent to 5.51 percent in
1998.

     A summary of the unit option activity is as follows:

<TABLE>
<CAPTION>
                                                                                                   JUNE 30, 1999
                               1996                    1997                    1998                 (UNAUDITED)
                       ---------------------   ---------------------   ---------------------   ---------------------
                                  WEIGHTED-               WEIGHTED-               WEIGHTED-               WEIGHTED-
                                   AVERAGE                 AVERAGE                 AVERAGE                 AVERAGE
                                   EXERCISE                EXERCISE                EXERCISE                EXERCISE
                        NUMBER      PRICE       NUMBER      PRICE       NUMBER      PRICE       NUMBER      PRICE
                       OF UNITS   (PER UNIT)   OF UNITS   (PER UNIT)   OF UNITS   (PER UNIT)   OF UNITS   (PER UNIT)
                       --------   ----------   --------   ----------   --------   ----------   --------   ----------
<S>                    <C>        <C>          <C>        <C>          <C>        <C>          <C>        <C>
Outstanding at
  beginning of year..       --         --      277,375      $1.00      400,000      $1.00      618,000      $2.12
Options granted......  277,375      $1.00      122,625      $1.00      241,875      $3.86      158,500      $4.44
Options exercised....       --         --           --         --           --                      --
                                                                                     ----
Options canceled.....       --         --           --         --      (23,875)     $1.00       (4,000)     $3.73
                       -------      -----      -------      -----      -------      -----      -------      -----
Outstanding at end of
  year...............  277,375      $1.00      400,000      $1.00      618,000      $2.12      772,500      $2.59
                       =======      =====      =======      =====      =======      =====      =======      =====
Options exercisable
  at year-end........  105,000      $1.00      238,688      $1.00      396,437      $1.25      471,937      $2.34
                       =======      =====      =======      =====      =======      =====      =======      =====
Units available for
  future grant.......                                                   67,000                  12,500
                                                                       =======                 =======
</TABLE>

     At December 31, 1998, the range of exercise prices and weighted-average
remaining contractual life of outstanding options was $1.00-$4.42, and 7.2
years, respectively.

  (b) Warrants

     The Company granted warrants to purchase an aggregate 11,312 member units
at an exercise price of $0.01 per unit to Telcom Ventures and Pyramid, as
consideration for obtaining short-term loans. As of December 31, 1998, warrants
to purchase 5,656 member units had not been exercised (note 5).

     In connection with the sale of membership units to 3Com, the Company
granted a conditional warrant to 3Com to purchase 357,466 member units at an
exercise price of $0.01 per unit. 3Com vests in 57,466 units upon completion of
a joint sales and marketing plan (note 12). 3Com vests in the remaining 300,000
warrants as follows: 150,000 warrants upon the occurrence of the Company
obtaining $6 million in engineering services revenue and 150,000 warrants upon
the Company obtaining 6,000 wireless service subscribers, all from opportunities
introduced by 3Com. If and when it becomes probable that 3Com will attain the
specified milestones necessary for the warrants to vest, the Company will begin
to record an expense reflecting the fair value of the warrant, which will be
determined in part based on the then market price of the common stock. The
Company would begin to recognize this expense based on the determination of
probability that the milestones would be achieved, continuing through the actual
vesting

                                      F-13
<PAGE>   85
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

date. The Company would initially estimate the amount of the expense at the time
of the determination that achievement is probable, based in part on the market
price of the common stock at that time. At the time of the actual vesting, the
fair value of the warrant would be remeasured and, if different from the value
used in initially estimating the expense, the difference would be reflected as
an additional charge or credit at that time. As of December 31, 1998, the
Company believes it is not yet probable that the member will attain the
specified milestones and, accordingly, no such expense has been recorded (note
12).

(10)  RELATED-PARTY TRANSACTIONS

  (a) Notes Receivable from Member

     As of December 31, 1997 and 1998, the Company had amounts due from a member
under short-term promissory notes of $10,000 and $137,879, respectively. The
Company classified the notes as a reduction of members' capital in the
accompanying statements of members' capital. The notes are callable by the
Company at any time and bear interest at a rate of 7.5 percent per annum.

  (b) Consulting Agreements

     The Company derived approximately 83 percent, 34 percent, and 39 percent of
its revenue for 1996, 1997, and 1998, respectively, from consulting arrangements
with one, one and two of its members, respectively. The Company had no trade
accounts receivable due from these members as of December 31, 1997 and 1998.

     As of December 31, 1997, the Company had received an advance of $162,500
from two of its members under consulting arrangements. This amount was recorded
as deferred revenue in the accompanying 1997 balance sheet, and was subsequently
recognized as revenue in 1998, when the related consulting services were
performed.

  (c) Purchases from Member

     In 1998, the Company purchased approximately $560,000 of equipment and
inventory from a member.

(11)  INVESTMENTS

     In February 1996, the Company made an investment of $750,000 to acquire a
20 percent interest in Real World Solutions, Inc. (RWS), a California company,
which was in the business of developing wireless middleware. The Company
accounted for its investment in RWS under the equity method and recorded its
proportionate share of losses generated by RWS. In July 1997, the Company sold
its interest in RWS to Puma Technology, Inc. (Puma), a Delaware company for
$205,000. The Company's carrying value of the investment in RWS as of the date
of sale was approximately $507,000 resulting in a realized loss on the sale of
the investment of approximately $302,000.

     Concurrently with the sale of the Company's investment in RWS to Puma, the
Company entered into an agreement with Puma for $175,000 to obtain perpetual
license rights for certain wireless middleware software. This amount has been
capitalized and is being amortized over a three-year period.

     In December 1996, the Company made an investment of $48,000 in Navox, Inc.,
(Navox) a privately-held Delaware company which provides wireless communication,
location and security system development services. In June 1997, the Company
made an additional investment of $26,457 in Navox. The Company's investment
represents an approximate 5.5 percent interest in Navox, and includes
representation on Navox's board of directors. The Company accounts for its
investment in Navox under the equity method of accounting and records its
proportionate share of losses generated by Navox. The Company derived
approximately 8 percent, 50 percent and 2 percent of its revenue for 1996, 1997
and 1998, respectively, under consulting arrangements with Navox. The Company
had trade accounts

                                      F-14
<PAGE>   86
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

receivables of approximately $82,000 and $0 due from Navox as of December 31,
1997 and 1998, respectively. The Company does not anticipate significant revenue
from Navox in the future.

(12)  SUBSEQUENT EVENTS (UNAUDITED)

  (a) Unit Options and Capitalization

     On May 27, 1999, the Board increased the number of units for issuance under
the Plan to 785,000 and the capitalization of the Company was increased to
11,000,000 units. On July 29, 1999, the Board further increased the number of
units for issuance under the Plan to 1,050,000. The Company recorded unit option
and warrant expense of approximately $401,000 for the six month period ended
June 30, 1999, to reflect the difference between the exercise price and the fair
market value of the units at the date of grant over the vesting period. Since
June 30, 1999, the Company has granted an additional 370,642 unit options. The
Company expects to record an additional $4.1 million in unit option and warrant
expense over the remaining vesting period of the options of two years.

  (b) Warrants

     In June 1999, 3Com completed the joint sales and marketing plan and was
vested in 57,466 warrants (note 9). As a result, the Company recorded unit
option and warrant expense of approximately $862,000. The Company believes that
it is not yet probable that the member will attain the specified milestones
relating to the remaining 300,000 warrants and, accordingly, no expense relating
to these warrants has been recorded.

  (c) Employment Agreement with Chief Executive Officer

     In June 1999, the Company entered into an employment agreement with its
Chief Executive Officer ("Executive"). As part of this agreement, the Executive
was granted 350,000 unit options at an exercise price of $4.00 per unit and the
right to grant an additional 50,000 unit options at an exercise price of $4.00
per unit to other key executives. These options vest only upon completion of an
initial public offering of the Company or sale of the Company at a price greater
than $15.00 per membership unit and expire in June 2009. Upon vesting of the
options, the Company will record unit option and warrant expense equal to the
difference between the fair value of the unit and the exercise price measured at
the date of the initial public offering or sale of Company times the number of
unit options. The Company expects to record unit option and warrant expense of
14.4 million at the date of the proposed initial public offering. In September
1999, the Company granted the Executive an additional 70,000 unit options at an
exercise price of $10.00 per unit. These options vest only upon completion of an
initial public offering. The Company expects to record unit option and warrant
expense of 2.1 million for these options at the date of the proposed initial
public offering.

  (d) OpenSky Venture

     On August 9, 1999, the Company entered into a new venture with a member,
forming a new Company called OpenSky. OpenSky was formed to develop wireless
Internet access, e-mail and electronic commerce services that address
opportunities in the emerging consumer and business mass markets. The Company
contributed a perpetual, non-exclusive, non-assignable, worldwide license to
certain proprietary software in exchange for a 26% equity interest in OpenSky in
the form of 7,000,000 shares of Series A Preferred Stock and an option to
purchase an additional 3,000,000 shares of Series A Preferred Stock for an
additional $2.5 million. Upon exercising the option, the Company would increase
their ownership in OpenSky to 33%. The option to acquire these additional shares
expires at the earlier of January 31, 2000 or 15 days after the close of an
initial public offering by the Company. Additionally, the Chief Executive
Officer of Company serves as Chairman of the OpenSky board of directors. The
Company will provide engineering services to OpenSky.

                                      F-15
<PAGE>   87
                   AETHER TECHNOLOGIES INTERNATIONAL, L.L.C.

                   NOTES TO FINANCIAL STATEMENTS-(CONTINUED)

  (e) Acquisition of Mobeo, Inc.

     On August 19, 1999, the Company entered into a purchase agreement to
acquire all the outstanding common stock of Mobeo, Inc. ("Mobeo") for an
aggregate purchase price consisting of cash of $11,857,000 which includes
estimated acquisition costs of $150,000, and 18,442 unit options with an
exercise price of $12.00 per unit valued at approximately $374,000. The
acquisition was closed on September 29, 1999. Mobeo provides employees and
customers at major banks and financial institutions with continuous pricing
information and news headlines for foreign exchange, government securities, and
commodity markets on wireless handheld devices. Additionally, the Company
entered into two-year advisory service agreements with two former owners of
Mobeo which provide for the grant of an aggregate 125,000 unit options with an
exercise price of $15.00 per unit in the Company. The Company expects to record
approximately $2,201,000 as unit option and warrant expense over the two-year
term of the agreements. The Company also issued 22,000 options at an exercise
price of $6.00 per unit and 30,000 options at an exercise price of $12.00 per
unit to employees of Mobeo. The Company expects to record approximately
$1,068,000 as unit option and warrant expense over the vesting period of the
options of two years.

  (f) Interim Credit Facilities

     In September 1999, the Company entered into a $17,000,000 senior secured
credit facility with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith
Incorporated. The credit facility is for a one year term, with the possibility
of extension for an additional one year term and accrues interest at a variable
rate. The credit facility is collateralized by substantially all of the assets
of the Company and contains certain financial covenants. In connection with the
credit facility, the Company granted warrants to Merrill Lynch Capital
Corporation to purchase up to 967,876 of the member units in the Company which
become exercisable for no consideration if the Company does not repay the credit
facility in a timely manner.

     On September 28, 1999, the Company borrowed approximately $14,830,000 under
the credit facility. The Company used approximately $11,700,000 of the proceeds
to purchase Mobeo, approximately $830,000 to pay fees and expenses related to
the credit facility, and approximately $2,300,000 for general corporate
purposes.

  (g) Incentive Plans

     In September 1999, the Company adopted the 1999 Equity Incentive Plan and a
Senior Bonus Plan.

  (h) Reserved Share Program

     Prior to the effectiveness of our registration statement for this offering,
we sent a letter to approximately 90 employees, officers and directors of our
company whom we had designated as potential offerees of up to 390,000 shares of
common stock in a directed share program in connection with this offering. These
materials were not accompanied by a preliminary prospectus and may have
constituted a prospectus that does not meet the requirements of the Securities
Act of 1933. If the mailing of these original materials did constitute a
violation of the Securities Act of 1933, the recipients of the letter who
purchased common stock in this offering could have the right, for a period of
one year from the date of their purchase of common stock, to obtain recovery of
the consideration paid in connection with their purchase of common stock or, if
they have already sold the stock, sue us for damages resulting from their
purchase of common stock. These refunds or damages could total up to
approximately $6.2 million, based on the initial public offering price of $16.00
per share, in the event that investors suffer a total loss of their investment
during this period and seek refunds or damages.

                                      F-16
<PAGE>   88

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders of Mobeo, Inc.

     In our opinion, the accompanying balance sheets and the related statements
of operations, changes in stockholders' equity (deficit) and cash flows, present
fairly, in all material respects, the financial position of Mobeo, Inc. at
December 31, 1997 and 1998, and the results of its operations and its cash flows
for the three years in the period ended December 31, 1998, in conformity with
generally accepted accounting principles. 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 which 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, assessing the accounting principles used and
significant estimates made by management, and evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for the opinion expressed above.

PricewaterhouseCoopers LLP
McLean, Virginia
March 10, 1999

                                      F-17
<PAGE>   89

                                  MOBEO, INC.

                                 BALANCE SHEETS

                                     ASSETS

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------    JUNE 30,
                                                                 1997         1998         1999
                                                              ----------   ----------   -----------
                                                                                        (UNAUDITED)
<S>                                                           <C>          <C>          <C>
Current assets:
  Cash and cash equivalents.................................  $  125,446   $  193,913   $  558,732
  Accounts receivable, net..................................     278,620      293,895      276,263
  Prepaid expenses and other................................      37,032       28,724       23,464
  Income tax refund receivable..............................      20,756       20,756           --
  Deferred income tax.......................................     142,365      186,549      465,417
                                                              ----------   ----------   ----------
          Total current assets..............................     604,219      723,837    1,323,876
Property and equipment, net.................................     321,876      405,148      335,703
Patents, net................................................          --       30,307       29,411
Deposits....................................................      24,475       23,609       27,609
Deferred income tax.........................................      71,476       14,542       17,938
                                                              ----------   ----------   ----------
          Total assets......................................  $1,022,046   $1,197,443   $1,734,537
                                                              ==========   ==========   ==========

                          LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable..........................................  $  989,316   $1,130,184   $  406,550
  Accrued expenses..........................................     275,541      390,172      811,431
  Income tax payable........................................          --           --       54,154
  Capital lease obligations.................................      12,159           --           --
  Deferred revenue..........................................      71,220      104,170      826,788
                                                              ----------   ----------   ----------
          Total current liabilities.........................   1,348,236    1,624,526    2,098,923
                                                              ----------   ----------   ----------
Commitments and contingencies
Stockholders' equity (deficit):
  Common stock; no par value, 10,000 shares authorized,
     1,171 shares issued and outstanding....................          --           --           --
  Additional paid-in capital................................     172,625      172,625      172,625
  Accumulated deficit.......................................    (455,795)    (556,688)    (537,011)
  Notes receivable-related parties..........................     (43,020)     (43,020)          --
                                                              ----------   ----------   ----------
          Total stockholders' deficit.......................    (326,190)    (427,083)    (364,386)
                                                              ----------   ----------   ----------
          Total liabilities and stockholders' deficit.......  $1,022,046   $1,197,443   $1,734,537
                                                              ==========   ==========   ==========
</TABLE>

   The accompanying notes are an integral part of these financial statements

                                      F-18
<PAGE>   90

                                  MOBEO, INC.

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                FOR THE YEAR ENDED DECEMBER 31,      SIX MONTHS ENDED JUNE 30,
                                              ------------------------------------   -------------------------
                                                 1996         1997         1998         1998          1999
                                              ----------   ----------   ----------   -----------   -----------
                                                                                            (UNAUDITED)
<S>                                           <C>          <C>          <C>          <C>           <C>
Service revenue.............................  $6,484,864   $7,088,993   $8,580,786   $4,462,584    $5,047,195
Cost of services............................   2,947,185    3,148,051    3,040,743    1,518,457     1,757,188
                                              ----------   ----------   ----------   ----------    ----------
Gross profit................................   3,537,679    3,940,942    5,540,043    2,944,127     3,290,007
                                              ----------   ----------   ----------   ----------    ----------
Selling, general and administrative
  expenses:
  Sales and marketing.......................   1,641,502    1,812,696    2,302,360    1,037,897     1,250,230
  General and administrative................   1,149,218    1,937,829    2,706,544    1,208,391     1,451,285
  Research and development..................      94,609      174,867      496,570      168,355       427,210
  Depreciation and amortization.............     355,276      464,419      112,903       48,237        60,405
                                              ----------   ----------   ----------   ----------    ----------
                                               3,240,605    4,389,811    5,618,377    2,462,880     3,189,130
                                              ----------   ----------   ----------   ----------    ----------
Other expense (income):
  Interest expense (income).................          --        2,628       (4,969)      (2,489)      (15,559)
  Loss on disposal of assets................          --      148,000       14,778        1,187        50,569
                                              ----------   ----------   ----------   ----------    ----------
          Total other expenses (income).....          --      150,628        9,809       (1,302)       35,010
                                              ----------   ----------   ----------   ----------    ----------
Income (loss) before income taxes...........     297,074     (599,497)     (88,143)     482,549        65,867
Provision for (benefit from) income taxes...     120,150     (211,841)      12,750      203,679        46,190
                                              ----------   ----------   ----------   ----------    ----------
Net income (loss)...........................  $  176,924   $ (387,656)  $ (100,893)  $  278,870    $   19,677
                                              ==========   ==========   ==========   ==========    ==========
</TABLE>

   The accompanying notes are an integral part of these financial statements

                                      F-19
<PAGE>   91

                                  MOBEO, INC.

            STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)

<TABLE>
<CAPTION>
                                                                                                       NOTES
                                                                          ADDITIONAL                 RECEIVABLE
                                                                           PAID-IN     ACCUMULATED    RELATED
                                                        SHARES   AMOUNT    CAPITAL       DEFICIT      PARTIES       TOTAL
                                                        ------   ------   ----------   -----------   ----------   ---------
<S>                                                     <C>      <C>      <C>          <C>           <C>          <C>
Balance at December 31, 1995..........................  1,171     $--      $172,625     $(245,063)   $      --    $ (72,438)
  Issuance of notes receivable-related parties........     --      --            --            --     (171,250)    (171,250)
  Net income..........................................     --      --            --       176,924           --      176,924
                                                        -----     ---      --------     ---------    ---------    ---------
Balance at December 31, 1996..........................  1,171     $--      $172,625     $ (68,139)   $(171,250)   $ (66,764)
  Issuance of notes receivable-related parties........     --      --            --            --      (65,603)     (65,603)
  Collections on notes receivable-related parties.....     --      --            --            --       71,250       71,250
  Allowance for notes receivable-related parties......     --      --            --            --      122,583      122,583
  Net loss............................................     --      --            --      (387,656)          --     (387,656)
                                                        -----     ---      --------     ---------    ---------    ---------
Balance at December 31, 1997..........................  1,171      --       172,625      (455,795)     (43,020)    (326,190)
  Net loss............................................     --      --            --      (100,893)          --     (100,893)
                                                        -----     ---      --------     ---------    ---------    ---------
Balance at December 31, 1998..........................  1,171     $--      $172,625     $(556,688)   $ (43,020)   $(427,083)
                                                        -----     ---      --------     ---------    ---------    ---------
  Allowance for notes receivable-related
    parties...........................................     --      --            --            --       43,020       43,020
  Net income..........................................     --      --            --        19,677           --       19,677
                                                        -----     ---      --------     ---------    ---------    ---------
Balance at June 30, 1999 (unaudited)..................  1,171     $--      $172,625     $(537,011)   $      --    $(364,386)
                                                        =====     ===      ========     =========    =========    =========
</TABLE>

   The accompanying notes are an integral part of these financial statements

                                      F-20
<PAGE>   92

                                  MOBEO, INC.

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                            SIX MONTHS ENDED
                                                       FOR THE YEAR ENDED DECEMBER 31,          JUNE 30,
                                                      ---------------------------------   ---------------------
                                                        1996        1997        1998        1998        1999
                                                      ---------   ---------   ---------   ---------   ---------
                                                                                               (UNAUDITED)
<S>                                                   <C>         <C>         <C>         <C>         <C>
Cash flows from operating activities:
  Net income (loss).................................  $ 176,924   $(387,656)  $(100,893)  $ 278,870   $  19,677
  Adjustments to reconcile net income (loss) to net
    cash provided by operating activities:
    Bad debt expense................................     23,976      62,956      51,620          --      23,697
    Deferred income taxes...........................     62,200    (211,841)     12,750          --    (282,264)
    Depreciation and amortization...................    355,276     464,419     112,903      48,237      60,405
    Loss on disposal of assets......................     57,472     148,009      14,778          --      50,569
    Allowance for notes receivable-related
       parties......................................         --     122,583          --          --      43,020
    Changes in assets and liabilities:
       Accounts receivable..........................     74,989    (181,580)    (66,895)   (125,801)     (6,065)
       Income tax refund receivable.................      6,414     (16,259)         --     (33,770)     20,756
       Restricted cash..............................     15,000          --          --          --          --
       Deposits, prepaid expenses and other.........     24,353     (30,990)      9,174     (16,822)      1,260
       Accounts payable and accrued expenses........    (66,407)    179,434     255,499    (346,545)   (302,375)
       Income tax payable...........................    (60,940)    (49,560)         --          --      54,154
       Deferred revenue.............................   (127,115)      4,114      32,950     315,986     722,618
                                                      ---------   ---------   ---------   ---------   ---------
         Net cash provided by operating
           activities...............................    542,142     103,629     321,886     120,155     405,452
                                                      ---------   ---------   ---------   ---------   ---------
Cash flows from investing activities:
  Purchase of property and equipment................   (347,526)    (68,558)   (210,804)   (106,020)    (40,633)
  Payments to acquire patent........................         --          --     (30,456)         --          --
  Advances of notes receivable-related parties......   (171,250)    (78,103)         --          --          --
  Collections on notes receivable-related parties...         --      83,750          --          --          --
                                                      ---------   ---------   ---------   ---------   ---------
         Net cash used in investing activities......   (518,776)    (62,911)   (241,260)   (106,020)    (40,633)
                                                      ---------   ---------   ---------   ---------   ---------
Cash flows from financing activities:
  Principal payments on capital leases..............    (42,268)    (48,414)    (12,159)    (12,159)         --
                                                      ---------   ---------   ---------   ---------   ---------
         Net cash used in financing activities......    (42,268)    (48,414)    (12,159)    (12,159)         --
                                                      ---------   ---------   ---------   ---------   ---------
Net increase (decrease) in cash and cash
  equivalents.......................................    (18,902)     (7,696)     68,467       1,976     364,819
Cash and cash equivalents at beginning of the
  year..............................................    152,044     133,142     125,446     125,446     193,913
                                                      ---------   ---------   ---------   ---------   ---------
Cash and cash equivalents at end of the year........  $ 133,142   $ 125,446   $ 193,913   $ 127,422   $ 558,732
                                                      =========   =========   =========   =========   =========
Supplemental disclosure of cash flow information:
  Cash paid for interest............................  $  20,360   $  13,428   $   1,378   $   1,378   $     152
                                                      =========   =========   =========   =========   =========
  Cash paid for income taxes........................  $ 112,476   $  65,819   $      --   $      --   $      --
                                                      =========   =========   =========   =========   =========
  Supplemental disclosure of non-cash investing and
    financing activities:
    Allowance for notes receivable-related
       parties......................................  $      --   $ 122,583   $      --   $      --   $  43,020
                                                      =========   =========   =========   =========   =========
</TABLE>

   The accompanying notes are an integral part of these financial statements

                                      F-21
<PAGE>   93

                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS

          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1999 AND 1998 IS UNAUDITED

1.  ORGANIZATION

     DocuPro, Inc. was incorporated in the District of Columbia and commenced
operations in January 1989. In June 1998, DocuPro reincorporated in the state of
Delaware and in September 1998 changed its name to Mobeo, Inc. (the Company).
The Company is an electronic publisher specializing in providing financial
information over wireless networks. The Company's F/X Alert(R) service provides
major banks and financial institutions with continuous pricing and news
headlines of foreign exchange, government securities, and commodity markets on a
palm sized data terminal. The Company's PocketFutures(R) product provides the
individual futures trader with continuous pricing and news headlines of future
markets. Subsequent to December 31, 1998, the Company launched the Mobeo1.0(R)
product, designed for the individual equities trader.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  Unaudited interim financial statements

     The unaudited balance sheet as of June 30, 1999, the unaudited statements
of operations and cash flows for the six months ended June 30, 1998 and 1999 and
the statement of changes in stockholders equity (deficit) for the six months
ended June 30, 1999, have been prepared in accordance with generally accepted
accounting principles for interim financial information and Article 10 of
Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles. In the opinion
of management, all adjustments (consisting of only normal remaining accruals)
considered necessary for a fair presentation have been included. Operating
results for the six months ended June 30, 1999 are not necessarily indicative of
results that may be expected for the year ending December 31, 1999.

  Use of 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 and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.

  Cash and cash equivalents

     All highly liquid instruments with original maturities of three months or
less are considered to be cash equivalents. The Company invests its cash
balances in repurchase accounts with a large financial institution.

  Revenue recognition

     The Company enters into one year service contracts for providing financial
information over wireless networks. For substantially all its customers, the
Company bills on a monthly cycle and recognizes revenue monthly. Certain of the
Company's customers are billed in advance annually with revenue deferred and
recognized on a monthly basis over the life of the agreement. Non-refundable
activation fees are billed and recognized at the time of initial subscription.

                                      F-22
<PAGE>   94
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

  Concentration of credit risk

     Financial instruments that potentially subject the Company to
concentrations of credit risk consist principally of cash and cash equivalents
and accounts receivable. The Company maintains its cash and cash equivalents in
bank accounts which, at times, may exceed federally insured limits. The Company
has not experienced any losses in such bank accounts. The Company believes it is
not exposed to any significant credit risk on cash and cash equivalents. The
Company regularly monitors all outstanding accounts receivable balances to
assess collectibility. Accounts receivable as of December 31, 1997 and 1998 and
June 30, 1999, are net of an allowance for doubtful accounts of $30,000, $32,700
and $32,700 (unaudited), respectively. The accounts receivable, which are not
collateralized, are due mainly from banks and financial institutions.

     Although the Company has sales on a national basis, 75% of their revenue
were derived in the New York City area. No individual accounts receivable were
greater than 10% of total accounts receivable as of December 31, 1997 and 1998,
and June 30, 1999 (unaudited).

  Property and equipment

     Property and equipment are recorded at cost. Property and equipment under
capital leases are recorded at the lower of their fair market value or the
present value of future minimum lease payments determined at the inception of
the lease.

     Amortization of leasehold improvements is recorded on a straight-line basis
over the shorter of the estimated useful life of the improvement or the term of
the lease. Amortization of property and equipment under capital leases is
recorded on a straight-line basis over the lease term. Property and equipment
under capital leases for which title passes to the Company at the conclusion of
the lease term is amortized on a straight line basis over the estimated useful
life of the related asset. Depreciation of other property and equipment is
recorded on a straight-line basis over expected useful lives of 3 to 10 years.

     When property and equipment is retired or otherwise disposed, the related
cost and accumulated depreciation are removed from the accounts and any
resulting gain or loss is reflected in income. Costs associated with repairs and
maintenance are expensed as incurred.

  Patents

     The cost of acquiring patents was approximately $30,000 as of December 31,
1998. Upon approval, the patents are to be amortized on a straight-line basis
over their estimated economic life, which is less than the statutory life of the
patents.

  Income taxes

     The Company accounts for income taxes in accordance with the liability
method. Deferred tax assets and liabilities are recognized for tax consequences
in future years for differences between financial reporting and tax bases of
assets and liabilities and are measured using the enacted tax rates and laws
that will be in effect when the differences are expected to reverse. The
provision for income taxes includes the current tax provision and the change
during the year in the net deferred tax liability or asset. A valuation
allowance is provided to reduce the deferred tax asset to a level which, more
likely than not, will be realized.

                                      F-23
<PAGE>   95
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

  Recent accounting pronouncements

     In June 1999, the FASB issued SFAS No. 137, Accounting for Derivative
Instruments and Hedging Activities-Deferral of the Effective Date of FASB No.
133 an amendment of FASB Statement No. 133, which defers the effective date of
SFAS No. 133 to all fiscal quarters of all fiscal years beginning after June 15,
2000. The Company will adopt SFAS No. 133 for the year ending December 31, 2000.
SFAS No. 133 requires that all derivative instruments be recorded on the balance
sheet at their fair value. Changes in the fair value of derivatives are recorded
each period in current earnings or other comprehensive income, depending on
whether a derivative is designated as part of a hedge transaction and, if it is,
the type of hedge transaction. Currently, the Company does not utilize
derivative instruments, therefore the adoption of SFAS No. 133 is not expected
to have a significant effect on the Company's results of operations or its
financial position.

  Reclassifications

     Certain amounts in the 1997 financial statements have been reclassified to
conform with the 1998 presentation.

3. PROPERTY AND EQUIPMENT

     Property and equipment consisted of the following:

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              ---------------------    JUNE 30,
                                                                1997        1998         1999
                                                              ---------   ---------   -----------
                                                                                      (UNAUDITED)
<S>                                                           <C>         <C>         <C>
System hardware and software................................  $ 278,202   $ 196,038    $ 205,195
Office furniture and equipment..............................    216,158     454,817      381,889
Leasehold improvements......................................     44,106      44,106       44,106
                                                              ---------   ---------    ---------
                                                                538,466     694,961      631,190
Less accumulated depreciation and amortization..............   (216,590)   (289,813)    (295,487)
                                                              ---------   ---------    ---------
                                                              $ 321,876   $ 405,148    $ 335,703
                                                              =========   =========    =========
</TABLE>

     During 1997, the Company leased certain office equipment under capital
leases. As of December 31, 1997, the cost of the office equipment related to
these capital leases was $44,035, and the accumulated amortization was $27,684.
These leases were fully amortized in 1998. The Company did not enter into any
new capital leases in 1998 or as of June 30, 1999.

     During 1997, the Company reassessed the useful life of their pagers, which
are provided to customers upon activation of services at no fee. Since the
Company's service agreements are for a one-year period and subject to
cancellation, non-payment and non-return risk, management changed the estimated
useful life from three years to immediate expense recognition when the pagers
are acquired. As a result, the remaining net book value of pagers acquired prior
to 1997 of $228,000 was charged to depreciation expense for the year ended
December 31, 1997, while pagers purchased for the years ended December 31, 1997
and 1998 totaled $138,000 and $281,000, respectively, and 114,000 (unaudited)
and $165,000 (unaudited) for the six months ended June 30, 1998 and 1999
respectively, were expensed as incurred.

     During 1997 and 1998, the Company disposed of certain system hardware and
software equipment with an original cost of $435,000 and $54,310, respectively,
and accumulated amortization of $287,000 and

                                      F-24
<PAGE>   96
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

$35,675, respectively. The resulting losses on disposals are included as a
separate component on the statement of operations.

4. INCOME TAXES

     The components of the provision for (benefit from) income taxes consisted
of the following:

<TABLE>
<CAPTION>
                                                            YEAR ENDED         SIX MONTHS ENDED
                                                           DECEMBER 31,            JUNE 30,
                                                        -------------------   -------------------
                                                          1997       1998       1998       1999
                                                        ---------   -------   --------   --------
                                                                                  (UNAUDITED)
<S>                                                     <C>         <C>       <C>        <C>
Current provision (benefit):
Federal...............................................  $      --   $    --   $199,383   $263,090
State and local.......................................         --        --     49,536     65,364
                                                        ---------   -------   --------   --------
                                                               --        --    248,919    328,454
                                                        ---------   -------   --------   --------
Deferred provision (benefit):
Federal...............................................   (169,073)   10,200    (39,388)  (255,775)
State and local.......................................    (42,768)    2,550     (5,582)   (26,489)
                                                        ---------   -------   --------   --------
                                                         (211,841)   12,750    (45,240)  (282,264)
                                                        ---------   -------   --------   --------
Total provision for (benefit from) income taxes.......  $(211,841)  $12,750   $203,679   $ 46,190
                                                        =========   =======   ========   ========
</TABLE>

     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Components of the
Company's net deferred tax assets and liabilities are as follows:

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------    JUNE 30,
                                                                1997       1998        1999
                                                              --------   --------   -----------
                                                                                    (UNAUDITED)
<S>                                                           <C>        <C>        <C>
Current deferred tax assets
Allowance for doubtful accounts.............................  $ 64,848   $ 65,995    $ 79,718
Deferred revenue............................................    30,264     36,611     325,122
Other.......................................................    10,714      3,163       4,564
Net operating loss carryback................................    36,539     80,780      56,013
                                                              --------   --------    --------
Total current deferred tax assets...........................  $142,365   $186,549    $465,417
                                                              --------   --------    --------
Noncurrent deferred tax assets
Accumulated depreciation....................................    71,476     14,542      17,938
                                                              --------   --------    --------
Total noncurrent deferred tax assets........................    71,476     14,542      17,938
                                                              --------   --------    --------
Total deferred tax assets...................................  $213,841   $201,091    $483,355
                                                              ========   ========    ========
</TABLE>

     The change in the deferred tax assets in 1998 primarily represents the
effect of changes in the amounts of temporary differences. The Company's 1998
provision for income taxes differs from the provision that would have resulted
from applying the federal statutory rates to net loss before taxes due to
permanent differences primarily attributable to deductible business meals and
entertainment and other permanent differences of 48%. The Company believes it is
more likely than not to realize the net deferred

                                      F-25
<PAGE>   97
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

tax asset and accordingly no valuation allowance has been provided as of
December 31, 1997 and 1998. This conclusion is based on, (i) the Company's
ability to carryback net operating losses to offset taxable income from previous
years and (ii) the Company's expected future profitability.

5.  PROFIT SHARING AND 401(k) PLANS

     The Company has a discretionary profit sharing plan and a self-directed
401(k) plan which cover all employees employed more than six months. Employees
become fully vested after three years of service. Employer contributions to the
profit sharing plan were $102,172 and $94,664 and contributions to the 401(k)
plan were $44,040 and $60,490 for the years ended December 31, 1997 and 1998,
respectively.

6. STOCK-BASED COMPENSATION

     On April 30, 1998, the Company adopted the Omnibus Stock Option Plan (the
Plan), under which incentive stock options, non-qualified stock options, stock
appreciation rights, restricted or unrestricted stock awards, phantom stock,
performance awards or any combination thereof may be granted to the Company's
employees and certain other persons in accordance with the Plan. The Board of
Directors, which administers the Plan, determines the number of options granted,
the vesting period and the exercise price. The Board of Directors may terminate
the Plan at any time. Options granted under the Plan generally vest over a four
year period and expire ten years after the date of grant. Prior to the common
stock becoming publicly traded, the Company retains the right of first offer to
buy the employees' shares at the offer price. At December 31, 1998, 48 shares
were reserved for issuance under the Plan.

     As of December 31, 1998 and June 30, 1999, a total of 35 and 45 incentive
stock options respectively, had been granted to employees, at an exercise price
of $3,250 per share. The exercise price was established by the Board of
Directors.

<TABLE>
<CAPTION>
                                                                                   WEIGHTED
                                                              INCENTIVE            AVERAGE
                                                                STOCK              EXERCISE
                                                               OPTIONS    PRICE     PRICE
                                                              ---------   ------   --------
<S>                                                           <C>         <C>      <C>
Options outstanding at December 31, 1997....................      --          --        --
Options granted.............................................      35      $3,250    $3,250
Options exercised...........................................      --          --
Options canceled............................................      --          --        --
                                                                 ---      ------    ------
Options outstanding at December 31, 1998....................      35      $3,250    $3,250
                                                                 ---      ------    ------
Options granted.............................................      10      $3,250    $3,250
Options exercised...........................................      --          --
Options canceled............................................      --          --        --
                                                                 ---      ------    ------
Options outstanding at June 30, 1999 (unaudited)............      45      $3,250    $3,250
                                                                 ===      ======    ======
</TABLE>

     At December 31, 1998 and June 30, 1999, no options were exercisable. The
weighted-average fair value of options granted during the year ended December
31, 1998 and the six months ended June 30, 1999 was $1,125 and $1,262
(unaudited) per share respectively, based on the Black-Scholes option pricing
model.

     The Company measures compensation expense for its employee stock-based
compensation using the intrinsic value method and provides pro forma disclosures
of net loss as if the fair value method had been applied in measuring
compensation expense. Under the intrinsic value method of accounting for
stock-based compensation, when the exercise price of options granted to
employees is less than the fair value of

                                      F-26
<PAGE>   98
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

the underlying stock on the date of grant, compensation expense is to be
recognized over the applicable vesting period. No options granted through
December 31, 1998 and June 30, 1999, respectively, were less than fair value of
the underlying stock. Had the fair value method been applied, the Company's net
loss at December 31, 1998 would have been increased and the Company's net income
at June 30, 1999 would have been decreased to the pro forma amounts indicated
below:

<TABLE>
<CAPTION>
                                                                         1998
                                                              ---------------------------
                                                              DECEMBER 31,     JUNE 30,
                                                                  1998           1999
                                                              ------------   ------------
                                                                             (UNAUDITED)
<S>                                                           <C>            <C>
Net loss as reported........................................   $(100,893)      $ 19,677
Pro forma net loss..........................................   $(103,313)      $ 18,275
</TABLE>

     The fair value of each option is estimated on the date of grant using the
Black-Scholes option pricing model with the following weighted-average
assumptions used for grants during the year ended December 31, 1998 and the six
months ended June 30, 1999: dividend yield of 0%, expected volatility of 0%,
risk-free interest rate of 5.07% and 5.53%, respectively, and expected term of 9
years.

     As of December 31, 1998 and June 30, 1999, the weighted average remaining
contractual life of the options is 9.7 years and 9.9 years, respectively.

7. COMMITMENTS AND CONTINGENCIES

  Data services and royalty arrangement

     In January 1995, the Company entered into a multi-year distribution
agreement with a provider of financial information for transmission to the
Company's customers. During 1998, the Company entered into two additional
multi-year agreements with new suppliers. Under these agreements, the Company
pays a monthly royalty to the data suppliers based on the number of wireless
units receiving data. Included in accounts payable at December 31, 1997 and 1998
and June 30, 1999, is $566,685, $200,000 and $68,923 (unaudited), respectively,
related to purchases of financial information for transmission to customers.

  Paging services

     In April 1994, the Company entered into a multi-year nonexclusive national
reseller agreement with a wireless messaging service provider. During 1998, the
Company entered into two additional multi-year nonexclusive national reseller
agreements with new suppliers. Under the terms of these agreements, the Company
is purchasing paging services from these providers for the purpose of marketing
and reselling such services to end users.

  Vulnerabilities due to certain concentrations

     The Company obtains all of its data from three sources and resells
primarily through one wireless messaging provider. Although there are a limited
number of data sources and messaging service providers, management believes that
they could obtain such services on terms comparable to the Company's existing
agreements. A change in suppliers, however, could cause delays in service, which
would adversely affect the Company's financial position, results of operations
and cash flows.

                                      F-27
<PAGE>   99
                                  MOBEO, INC.
                         NOTES TO FINANCIAL STATEMENTS
          INFORMATION AS OF JUNE 30, 1999 AND FOR THE SIX MONTHS ENDED
                 JUNE 30, 1999 AND 1998 IS UNAUDITED-CONTINUED

  Leases

     The Company leases office space in Bethesda, Maryland for its corporate
headquarters under an agreement which expires in December 1999. In addition, the
Company maintains facilities in New York, N.Y., under an agreement which expires
in 1999. The lease agreement for its corporate headquarters contains provisions
allowing free rent periods and periodic rate increases during the lease terms.
The Company recognizes rent expense under operating leases ratably over the
lease terms. As of December 31, 1997 and 1998 and June 30, 1999, the Company had
$13,000 and $7,000 and $3,000 (unaudited), respectively, recorded as deferred
rent included in accrued expenses. Total rent expense was $238,783 and $239,936
for the years ended December 31, 1997 and 1998, respectively and $112,312
(unaudited) and $142,894 (unaudited) for the six months ended June 30, 1998 and
1999, respectively.

     In addition to office space, the Company leases an automobile under a 36
month operating lease, which expires in 1999.

     Future minimum lease payments under non-cancelable operating leases are as
follows:

<TABLE>
<S>                                                          <C>
1999.......................................................  $201,695
</TABLE>

8. RELATED PARTY TRANSACTIONS

     In 1996, the Company advanced $171,250 to certain employees and
shareholders under notes receivable arrangements. During 1997, the Company
advanced an additional $78,103 under these arrangements, and received $83,750 in
collections on the notes receivables. There is no planned settlement of the
notes receivable balance in the foreseeable future, therefore the Company has
classified the amounts as a component of stockholders' equity (deficit). Under
these arrangements, the Company provided an allowance for doubtful accounts of
$122,583 to reflect the net realizable value of the notes at December 31, 1997
and 1998, respectively.

9. SUBSEQUENT EVENTS (UNAUDITED)

     On July 14, 1999, the Company executed a Promissory Note with one of its
employees for $20,000. The Promissory Note bears interest at 7%. Principal and
interest payments are due beginning on September 1, 2002 with the final payment
due on August 1, 2006.

     On June 30, 1999, the Company accrued $154,000 for a pending legal claim
filed against the Company. This accrual relates to a dispute between the Company
and its former data transmitter vendor. The vendor maintains that the Company is
liable for late fee charges, exchange fees and lost pager fees that the Company
previously deducted from a royalty payment made to the vendor. The Company is
investigating the charges and believes the charges are without merit. No
assurance can be given, however, that this matter will be resolved in the
Company's favor.

                                      F-28
<PAGE>   100

                         UNAUDITED PRO FORMA CONDENSED
                       CONSOLIDATED FINANCIAL INFORMATION

     The unaudited pro forma condensed consolidated financial information has
been prepared by Aether's management and gives effect to the Mobeo acquisition.
The pro forma condensed consolidated statements of operations for the year ended
December 31, 1998 and for the six months ended June 30, 1999 have been prepared
to give effect to the Mobeo acquisition as if it had occurred on January 1,
1998. The pro forma net loss per share information gives effect to our
conversion from a limited liability company to a corporation. The pro forma
condensed consolidated balance sheet as of June 30, 1999 gives effect to the
Mobeo acquisition as if it had occurred on June 30, 1999. The pro forma
consolidated as adjusted balance sheet information gives effect to the Mobeo
acquisition and the conversion to a corporation plus the offering of shares
covered by this prospectus and the application of the net proceeds.

     The pro forma adjustments, which are based upon available information and
certain assumptions that Aether believes are reasonable in the circumstances,
are applied to the historical financial statements of Aether and Mobeo. The
Mobeo acquisition is accounted for under the purchase method of accounting.
Aether's allocation of the purchase price is based upon the estimated fair value
of assets acquired and liabilities assumed in accordance with Accounting
Principles Board Opinion No. 16. The purchase price allocations reflected in the
accompanying unaudited pro forma condensed consolidated financial statements may
be different from the final allocation of the purchase price and any such
differences may be material.

     The accompanying unaudited pro forma condensed consolidated financial
information should be read in conjunction with the historical financial
statements and the notes thereto for both Aether and Mobeo, which are included
elsewhere in this prospectus. The unaudited pro forma condensed consolidated
financial statements are provided for informational purposes only and do not
purport to represent what Aether's financial position or results of operations
would actually have been had the Mobeo acquisition occurred on such dates or to
project Aether's results of operations or financial position for any future
period.

                                      F-29
<PAGE>   101

                              AETHER SYSTEMS, INC.

                         UNAUDITED PRO FORMA CONDENSED
                           CONSOLIDATED BALANCE SHEET

<TABLE>
<CAPTION>
                                                                        AS OF JUNE 30, 1999
                                  -----------------------------------------------------------------------------------------------
                                                                  PRO FORMA
                                                                 ACQUISITION                        PRO FORMA        PRO FORMA
                                  HISTORICAL       HISTORICAL   AND FINANCING        PRO FORMA       OFFERING      CONSOLIDATED
                                    AETHER           MOBEO       ADJUSTMENTS        CONSOLIDATED   ADJUSTMENTS      AS ADJUSTED
                                  ----------       ----------   -------------       ------------   ------------   ---------------
<S>                               <C>              <C>          <C>                 <C>            <C>            <C>
                                                             ASSETS
Current assets:
  Cash and cash equivalents.....  $  457,305       $  558,732    $ 2,143,000(A)     $ 3,159,037    $ 73,172,400(B)  $76,331,437
  Short-term investments........   3,957,602               --                         3,957,602                       3,957,602
  Accounts receivable, net......     124,873          276,263                           401,136                         401,136
  Inventory, net................      88,368               --                            88,368                          88,368
  Prepaid and other current
    assets......................      71,816           23,464                            95,280                          95,280
  Deferred income tax...........          --          465,417       (465,417)(A)             --                              --
                                  ----------       ----------    -----------        -----------    ------------     -----------
    Total current assets........   4,699,964        1,323,876      1,677,583          7,701,423      73,172,400      80,873,823
Property and equipment, net of
  accumulated depreciation......   1,166,849          335,703                         1,502,552                       1,502,552
Other assets....................          --           27,609                            27,609                          27,609
Deferred income taxes...........          --           17,938        (17,938)(A)             --                              --
Deferred financing fees.........          --               --        830,000(A)         830,000        (830,000)(B)          --
Other intangibles...............          --               --      6,600,000(A)       6,600,000                       6,600,000
Goodwill........................          --           29,411      9,064,587(A)       9,093,998                       9,093,998
                                  ----------       ----------    -----------        -----------    ------------     -----------
    Total assets................  $5,866,813       $1,734,537    $18,154,232        $25,755,582    $ 72,342,400     $98,097,982
                                  ==========       ==========    ===========        ===========    ============     ===========

                                     LIABILITIES, MEMBERS' CAPITAL AND STOCKHOLDERS' EQUITY
Current liabilities :
  Accounts payable..............  $  347,919       $  406,550                       $   754,469    $                $   754,469
  Accrued expenses..............     653,012          811,431                         1,464,443                       1,464,443
  Income tax payable............          --           54,154        (54,154)(A)             --                              --
  Deferred revenue..............      25,000          826,788                           851,788                         851,788
  Note payable..................          --               --     14,830,000(A)      14,830,000     (14,830,000)(B)          --
                                  ----------       ----------    -----------        -----------    ------------     -----------
    Total current liabilities...   1,025,931        2,098,923     14,775,846(A)      17,900,700     (14,830,000)      3,070,700
Deferred tax liability..........          --               --      2,640,000(A)       2,640,000                       2,640,000
Members' capital................   4,840,882               --        374,000(A)       5,214,882      (5,214,882)(B)          --
Stockholders' equity (deficit):
  Preferred stock, $0.01 par
    value; 1,000,000 shares
    authorized; 0 shares issued
    and outstanding (pro forma
    consolidated, as
    adjusted)...................          --               --                                --                              --
  Common stock, $0.01 par value;
    75,000,000 shares
    authorized, 26,066,995
    shares issued and
    outstanding (pro forma
    consolidated, as
    adjusted)...................          --               --                                --         260,670(B)      260,670
  Additional paid-in-capital....          --          172,625       (172,625)(A)             --      92,956,612(B)   92,956,612
  Accumulated deficit...........          --         (537,011)       537,011(A)              --        (830,000)(B)    (830,000)
                                  ----------       ----------    -----------        -----------    ------------     -----------
    Total stockholders' equity
      (deficit).................          --         (364,386)       364,386                 --      92,387,282      92,387,282
                                  ----------       ----------    -----------        -----------    ------------     -----------
    Total liabilities, members'
      capital and stockholders'
      equity....................  $5,866,813       $1,734,537    $18,154,232        $25,755,582    $ 72,342,400     $98,097,982
                                  ==========       ==========    ===========        ===========    ============     ===========
</TABLE>

- ---------------

(A) The Mobeo acquisition is to be accounted for as a purchase pursuant to
    Accounting Principles Board Opinion No. 16. Under such purchase accounting
    principles, Mobeo's assets acquired and liabilities assumed are required to
    be adjusted to their estimated fair values at the date of acquisition. The
    difference between the purchase cost and the fair value of Mobeo's net
    tangible and identifiable intangible assets is goodwill.

     The purchase price for Mobeo is as follows:

<TABLE>
<S>                                                 <C>
Cash consideration................................  $11,707,000
Units options.....................................      374,000*
Estimated costs and expenses......................      150,000
                                                    -----------
    Total purchase price..........................  $12,231,000
                                                    ===========
</TABLE>

- ---------------

* Represents the value of 18,442 fully vested unit options at an exercise price
  of $12.00 per unit granted to three employees of Mobeo in exchange for their
  fully vested options in Mobeo. The value of the unit options was calculated
  using the Black-Scholes option pricing model with the following assumptions:
  fair market value of $30.00 per unit, expected dividend yield 0 percent,
  risk-free interest rate of 4.0 percent, expected life of two years and
  volatility of 70 percent.

                                      F-30
<PAGE>   102

     The Company financed the acquisition of Mobeo with a short-term note
payable. The Company expects to repay this short-term note payable with the
proceeds from its initial public offering.

     The allocation of the purchase price to the fair value of the assets
acquired and liabilities assumed is preliminary and will be finalized following
completion of a full valuation of acquired assets and liabilities of Mobeo. The
preliminary allocation of the purchase price is as follows:

<TABLE>
<S>                                                 <C>
Current assets....................................  $   858,459
Fixed assets, net.................................      335,703
Other assets......................................       27,609
Current liabilities...............................   (2,044,769)
Deferred tax liability............................   (2,640,000)***
In-place workforce................................      200,000**
Acquired subscribers..............................    6,400,000**
Goodwill..........................................    9,093,998
                                                    -----------
    Total purchase cost...........................  $12,231,000
                                                    ===========
</TABLE>

 ** The Company plans to amortize identifiable intangible assets and goodwill as
    follows:

    In-place workforce       3 years
    Acquired subscribers     5 years
    Goodwill                 7 years

*** The Company has recorded a deferred tax liability of $2,640,000 due to the
    fact that the identifiable intangible assets, in-place workforce and
    acquired subscribers have no basis for tax reporting purposes. The deferred
    tax liability was determined using a tax rate of 40 percent.

    Also reflects the borrowing of $14,830,000 under a short-term note payable
    for related payment of deferred financing fees of $830,000, payment of
    acquisition costs of $11,857,000, and cash of $2,143,000 for general
    corporate purposes.

(B) Reflects the sale of 6,000,000 shares of Common Stock in the Offering at the
    initial public offering price, after deducting underwriting discounts and
    commissions and offering expenses, the repayment of the short-term note
    payable, and the merger of the Company with and into Aether Systems, Inc. at
    an assumed conversion of one unit to 2.5 shares of Common Stock. Also
    includes recording of expense for deferred financing fees of $830,000
    associated with repayment of short-term note payable.

                                      F-31
<PAGE>   103

                              AETHER SYSTEMS, INC.

                   UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
                            STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                                                            SIX MONTHS ENDED JUNE 30, 1999
                                                              -----------------------------------------------------------
                                                                                            PRO FORMA
                                                              HISTORICAL    HISTORICAL     ACQUISITION        PRO FORMA
                                                                AETHER        MOBEO        ADJUSTMENTS       CONSOLIDATED
                                                              -----------   ----------   ---------------     ------------
<S>                                                           <C>           <C>          <C>                 <C>
Revenues:
  Subscriber revenue........................................  $   598,810   $5,047,195                       $ 5,646,005
  Engineering service revenue...............................      188,274           --                           188,274
                                                              -----------   ----------                       -----------
    Total revenue...........................................      787,084    5,047,195                         5,834,279
                                                              -----------   ----------                       -----------
Cost of subscriber revenue..................................      530,823    1,757,188                         2,288,011
Cost of engineering service revenue.........................      119,829           --                           119,829
                                                              -----------   ----------                       -----------
    Total cost of revenue...................................      650,652    1,757,188                         2,407,840
                                                              -----------   ----------                       -----------
         Gross profit.......................................      136,432    3,290,007                         3,426,439
                                                              -----------   ----------
Operating expenses:
  Research and development..................................    1,002,107      427,210                         1,429,317
  General and administrative................................    1,582,600    1,451,285     $  (516,289)(B)     2,517,596
  Selling and marketing.....................................      555,428    1,250,230        (446,405)(B)     1,359,253
  Depreciation and amortization.............................      193,523       60,405       1,322,905(A)      1,576,833
  Unit option and warrant expense...........................    1,263,150           --         817,250(C)      2,080,400
                                                              -----------   ----------     -----------       -----------
    Total operating expenses................................    4,596,808    3,189,130       1,177,461         8,963,399
                                                              -----------   ----------     -----------       -----------
Operating (loss) income.....................................   (4,460,376)     100,877      (1,177,461)       (5,536,960)
Interest income, net(E).....................................      140,753       15,559                           156,312
Other income (loss).........................................           --      (50,569)                          (50,569)
                                                              -----------   ----------     -----------       -----------
(Loss) income before income tax provision...................   (4,319,623)      65,867      (1,177,461)       (5,431,217)
                                                                                46,190         (46,190)(D)
Income tax provision........................................           --           --        (269,933)(D)      (269,933)
                                                              -----------   ----------     -----------       -----------
Net (loss) income...........................................  $(4,319,623)  $   19,677     $  (861,338)      $(5,161,284)
                                                              ===========   ==========     ===========       ===========
Pro forma net (loss) income per share-basic and
  diluted(F)................................................                                                 $     (0.20)
                                                                                                             ===========
Pro forma weighted average shares used in per share
  computations: basic and diluted(F)........................                                                  25,877,855
                                                                                                             ===========
</TABLE>

- ---------------
(A) Reflects the amortization of intangible assets, including goodwill over
    three to seven year periods. The estimated period of amortization of
    identifiable intangible assets and goodwill is based on preliminary
    allocations of values to identifiable intangible assets of Mobeo. The
    Company does not believe that the final allocation of values to intangible
    assets and goodwill of Mobeo will result in amortization expense materially
    different from the adjustment above.

(B) Reflects the elimination of compensation expense associated with certain
    management employees of Mobeo who will cease employment following the
    acquisition and will not be replaced.

(C) Reflects the amortization of the estimated fair value of 125,000 unit
    options with an exercise price of $15.00 per unit granted to two former
    owners of Mobeo for consulting services over the two year lives of the
    consulting agreements. The value of the unit options was calculated using
    the Black-Scholes option pricing model with the following assumptions: fair
    market value of $30.00 per unit, expected dividend yield of 0 percent,
    risk-free interest rates of 4.0 percent, expected life of eighteen months
    and volatility of 70 percent. Also reflects amortization of the fair value
    of 30,000 unit options at an exercise price of $12.00 per unit and 22,000
    unit options at an exercise price of $6.00 per unit granted to employees of
    Mobeo. The value of the unit options was calculated using the difference
    between the exercise price and the fair market value of $30.00 per unit.

(D) Reflects the elimination of the current income tax provision due to the
    Company's net operating losses and the recording of a deferred tax benefit
    related to the amortization of identifiable intangibles.

(E) The pro forma condensed consolidated statement of operations does not
    reflect any interest expense associated with the short-term debt expected to
    be used to finance the acquisition of Mobeo as the Company expects to repay
    such short-term debt with the proceeds from its initial public offering.

(F) The pro forma loss per share information gives effect to the merger of the
    Company with and into Aether Systems, Inc. in which each unit will be
    exchanged for 2.5 shares of common stock in Aether Systems, Inc., and the
    issuance of 6,000,000 shares of common stock in the offering.

                                      F-32
<PAGE>   104

                              AETHER SYSTEMS, INC.

                   UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
                            STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                                                      FOR THE YEAR ENDED DECEMBER 31, 1998
                                                           -----------------------------------------------------------
                                                                                         PRO FORMA
                                                           HISTORICAL    HISTORICAL     ACQUISITION        PRO FORMA
                                                             AETHER        MOBEO        ADJUSTMENTS       CONSOLIDATED
                                                           -----------   ----------   ---------------     ------------
<S>                                                        <C>           <C>          <C>                 <C>
Revenues:
  Subscriber revenue.....................................  $   549,057   $8,580,786                       $ 9,129,843
  Engineering service revenue............................      963,165           --                           963,165
                                                           -----------   ----------                       -----------
    Total revenue........................................    1,512,222    8,580,786                        10,093,008
                                                           -----------   ----------                       -----------
Cost of subscriber revenue...............................      797,165    3,040,743                         3,837,908
Cost of engineering service revenue......................      304,137           --                           304,137
                                                           -----------   ----------                       -----------
    Total cost of revenue................................    1,101,302    3,040,743                         4,142,045
                                                           -----------   ----------                       -----------
         Gross profit....................................      410,920    5,540,043                         5,950,963
                                                           -----------   ----------                       -----------
Operating expenses:
  Research and development...............................    1,267,320      496,570                         1,763,890
  General and administrative.............................    2,773,332    2,706,544     $  (889,761)(B)     4,590,115
  Selling and marketing..................................      840,455    2,302,360        (789,524)(B)     2,353,291
  Depreciation and amortization..........................      264,685      112,903       2,645,810(A)      3,023,398
  Unit option and warrant expense........................       32,580           --       1,634,500(C)      1,667,080
                                                           -----------   ----------     -----------       -----------
    Total operating expenses.............................    5,178,372    5,618,377       2,601,025        13,397,774
                                                           -----------   ----------     -----------       -----------
Operating loss...........................................   (4,767,452)     (78,334)     (2,601,025)       (7,446,811)
Interest income, net(E)..................................       74,180        4,969                            79,149
Loss on disposal of assets...............................           --      (14,778)                          (14,778)
                                                           -----------   ----------     -----------       -----------
Loss before income tax provision.........................   (4,693,272)     (88,143)     (2,601,025)       (7,382,440)
Income tax provision.....................................           --       12,750         (12,750)(D)            --
                                                                                           (539,866)(D)      (539,866)(D)
                                                           -----------   ----------     -----------       -----------
Net loss.................................................  $(4,693,272)  $ (100,893)    $(2,048,409)      $(6,842,574)
                                                           ===========   ==========     ===========       ===========
Pro forma net loss per share basic and diluted (F).......                                                 $     (0.31)
                                                                                                          ===========
Pro forma weighted average shares used in per share
  computations: basic and diluted(F).....................                                                  21,916,383
                                                                                                          ===========
</TABLE>

- ---------------
(A) Reflects the amortization of intangible assets, including goodwill over
    three to seven year periods. The estimated period of amortization of
    identifiable intangible assets and goodwill is based on preliminary
    allocations of values to identifiable intangible assets of Mobeo. The
    Company does not believe that the final allocation of values to intangibles
    and goodwill of Mobeo will result in amortization expense materially
    different from the adjustment above.

(B) Reflects the elimination of compensation expense associated with certain
    management employees of Mobeo who will cease employment following the
    acquisition and will not be replaced.

(C) Reflects the amortization of the estimated fair value of 125,000 unit
    options at an exercise price of $15.00 per unit granted to former owners of
    Mobeo for consulting services over the two year lives of the consulting
    agreements. The value of the unit options was calculated using the
    Black-Scholes option pricing model with the following assumptions: fair
    market value of $30.00 per unit, expected dividend yield of 0 percent,
    risk-free interest rate of 4.0, expected life of eighteen months and
    volatility of 70 percent. Also reflects amortization of the fair value of
    30,000 unit options at an exercise price of $12.00 per unit and 22,000 unit
    options at an exercise price of $6.00 per unit granted to employees of
    Mobeo. The value of the unit options was calculated using the difference
    between the exercise price and the fair market value of $30.00 per unit.

(D) Reflects the elimination of the current income tax provision due to the
    Company's net operating losses and the recording of deferred tax benefit
    related to the amortization of identifiable intangibles.

(E) The pro forma condensed consolidated statement of operations does not
    reflect any interest expense associated with the short-term debt expected to
    be used to finance the acquisition of Mobeo as the Company expects to repay
    such short-term debt with the proceeds from its initial public offering.

(F) The pro forma loss per share information gives effect to the merger of the
    Company with and into Aether Systems, Inc. in which each unit will be
    exchanged for 2.5 shares of common stock in Aether Systems, Inc., and the
    issuance of 6,000,000 shares of common stock in the offering.

                                      F-33
<PAGE>   105

                      [DESCRIPTION OF INSIDE BACK COVER:]

     The inside back cover includes the Aether logo and the words "Bringing
wireless data to the enterprise."
<PAGE>   106

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     Through and including November 14, 1999 (the 25th day after the date of
this prospectus), all dealers effecting transactions in these securities,
whether or not participating in this offering, may be required to deliver a
prospectus. This is in addition to the dealers' obligation to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.

                                6,000,000 SHARES

                                 [AETHER LOGO]

                                  COMMON STOCK

                          ---------------------------

                                   PROSPECTUS

                          ---------------------------

                              MERRILL LYNCH & CO.

                               ROBERTSON STEPHENS

                          DONALDSON, LUFKIN & JENRETTE

                           U.S. BANCORP PIPER JAFFRAY

                                OCTOBER 20, 1999

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- --------------------------------------------------------------------------------


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