EFFICIENT NETWORKS INC
S-1/A, 1999-06-30
COMMUNICATIONS SERVICES, NEC
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<PAGE>


      As filed with the Securities and Exchange Commission on June 30, 1999
                                                      Registration No. 333-77795
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                               ----------------

                            AMENDMENT NO. 3 to

                                    FORM S-1

                             REGISTRATION STATEMENT

                                     Under
                           The Securities Act of 1933
                               ----------------
                            EFFICIENT NETWORKS, INC.
             (Exact name of Registrant as specified in its charter)

<TABLE>
<CAPTION>
<S>                                  <C>                             <C>
            Delaware                             3661                      75-2486865
  (State or other jurisdiction of    (Primary Standard Industrial       (I.R.S. Employer
   incorporation or organization)     Classification Code Number)    Identification Number)
</TABLE>
                               ----------------
                      4201 Spring Valley Road, Suite 1200
                            Dallas, Texas 75244-3666
                                 (972) 991-3884
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                               ----------------
                                 MARK A. FLOYD
                            Chief Executive Officer
                      4201 Spring Valley Road, Suite 1200
                            Dallas, Texas 75244-3666
                                 (972) 991-3884
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                               ----------------
                                   Copies to:
         KENNETH M. SIEGEL                     S. MICHAEL DUNN, P.C.
          ADAM R. DOLINKO                      MICHELLE KWAN MONTOYA
          PETER F. STEWART                Brobeck, Phleger & Harrison LLP
           HELEN E. QUINN                 301 Congress Avenue, Suite 1200
  Wilson Sonsini Goodrich & Rosati              Austin, Texas 78701
      Professional Corporation                    (512) 477-5495
         650 Page Mill Road
    Palo Alto, California 94304
           (650) 493-9300

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

Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effective date of this Registration Statement.
   If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]
   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
   If delivery of the prospectus is expected to be made pursuant to Rule 434,
check the following box. [_]
The Registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the Registrant shall file
a further amendment which specifically states that this Registration Statement
shall hereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to such Section 8(a),
may determine.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+The information in this prospectus is not complete and may be changed. We may +
+not sell these securities until the registration statement filed with the     +
+Securities and Exchange Commission is effective. This prospectus is not an    +
+offer to sell these securities and it is not soliciting an offer to buy these +
+securities in any state where the offer or sale is not permitted.             +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                SUBJECT TO COMPLETION, DATED JUNE 30, 1999

                                4,000,000 Shares

                [LOGO OF EFFICIENT NETWORKS, INC. APPEARS HERE]

                                  Common Stock

                                   --------

  Prior to this offering, there has been no public market for our common stock.
The initial public offering price is expected to be between $10.00 and $12.00
per share. Our shares have been approved for listing on The Nasdaq Stock
Market's National Market under the symbol "EFNT."

  The underwriters have an option to purchase a maximum of 600,000 additional
shares to cover over-allotments of shares.

  Investing in our common stock involves risks. See "Risk Factors" on page 6.

<TABLE>
<CAPTION>
                                                    Underwriting
                                       Price to    Discounts and   Proceeds to
                                        Public      Commissions     Efficient
                                    -------------- -------------- --------------
<S>                                 <C>            <C>            <C>
Per Share..........................  $              $              $
Total.............................. $              $              $
</TABLE>

  Delivery of the shares of common stock will be made on or about     , 1999.

  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.

Credit Suisse First Boston

                         BancBoston Robertson Stephens

                                                    Volpe Brown Whelan & Company

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

                       [INSIDE FRONT COVER OF PROSPECTUS]


  [Graphic of network: Internet and corporate local area networks, over a DSL
  provider's network to four types of users; small business Internet users;
  consumer Internet users; branch office remote access users; and telecommuters]

<PAGE>

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                      Page
                                      ----
<S>                                   <C>
Prospectus Summary..................    3
Risk Factors........................    6
Special Note Regarding Forward-
 Looking Statements.................   17
Use Of Proceeds.....................   18
Dividend Policy.....................   18
Capitalization......................   19
Dilution............................   20
Selected Consolidated Financial
 Data...............................   21
Management's Discussion And Analysis
 Of Financial Condition And Results
 Of Operations......................   22
</TABLE>
<TABLE>
<CAPTION>
                                      Page
                                      ----
<S>                                   <C>
Business..........................     32
Management........................     50
Certain Transactions..............     57
Principal Stockholders............     59
Description Of Capital Stock......     62
Shares Eligible For Future Sale...     65
Underwriting......................     67
Notice To Canadian Residents......     69
Legal Matters.....................     70
Experts...........................     70
Additional Efficient Information..     70
Index To Consolidated Financial
 Statements.......................    F-1
</TABLE>

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

   You should rely only on the information contained in this document or to
which we have referred you. We have not authorized anyone to provide you with
information that is different. This document may only be used where it is
legal to sell these securities. The information in this document may only be
accurate on the date of this document.



                     Dealer Prospectus Delivery Obligation

   Until      , 1999 (25 days after the commencement of this offering), all
dealers that effect transactions in these securities, whether or not
participating in this offering, may be required to deliver a prospectus. This
is in addition to the dealer's obligation to deliver a prospectus when acting
as an underwriter and with respect to unsold allotments or subscriptions.

<PAGE>

                               PROSPECTUS SUMMARY

   This summary highlights information contained elsewhere in this prospectus.
You should read the entire prospectus carefully.

                            Efficient Networks, Inc.

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

   Efficient Networks is a worldwide developer and supplier of high-speed
digital subscriber line customer premises equipment for the high-speed, high-
volume digital communication, or broadband, access market. According to Cahners
In-Stat Group, Efficient was ranked as number five of the top six worldwide
producers of digital subscriber line customer premises equipment in terms of
both revenues and number of units shipped in 1998 and moved up to number three
of the top six suppliers in the first quarter of calendar 1999. Digital
subscriber line, or DSL, solutions enable telecommunications and other
communication network service providers to provide high-speed, cost-effective
broadband access services over the existing copper wire telephone
infrastructure. We believe there is significant demand for broadband access,
especially among business users and consumers who have found current solutions
to be inadequate or too expensive. DSL networks generally consist of two core
components, one installed at the network operator's facility--typically
referred to as the central office--and one installed at the customer's home or
business. The DSL equipment installed at the customer premises is generally
referred to as customer premises equipment. We develop and produce DSL customer
premises equipment, and in particular single- and multiple-user DSL customer
premises equipment for small- to medium-size businesses, branch offices of
large corporations and consumers. Our DSL products enable applications such as
high-speed Internet access, electronic commerce, access to computer networks
from remote locations, telecommuting and extensions of corporate networks to
branch offices.

   Business-critical Internet-based applications, such as electronic commerce,
Web browsing and access to computer networks from remote locations for
telecommuters, generate enormous data traffic over the existing communications
infrastructure. The growth in Internet use, increased competition resulting
from domestic and international deregulation, and pressure from alternative
means of providing high-speed, high-volume access services have led both
traditional and new operators of the existing copper telephone wire-based
networks to deploy DSL. DSL technology enables these network service providers
to rely upon the existing copper telephone wire infrastructure to cost-
effectively provide broadband access to most businesses and homes currently
connected by telephone lines.

   In order to offer cost-effective DSL services to end users, network service
providers are actively seeking DSL customer premises equipment solutions that
offer interoperability from the end user's personal computer through the
service provider's networks and which provide for simple and low-cost
installation and maintenance. The products that make up our SpeedStream family
of customer premises equipment satisfy the requirements of network service
providers, as they:

 . Enable DSL Deployments. We enable network service providers to rapidly deploy
  DSL services, thereby allowing them to quickly capture market share in
  today's intensely competitive broadband services market.

 . Ensure End-To-End Interoperability. Our technology expertise and ongoing
  product development coordination with network equipment vendors, such as ADC
  Telecommunications, Advanced Fibre Communications, Alcatel, Diamond Lane
  Communications, DSC Communications, Ericsson, Lucent Technologies, Newbridge
  Networks, Nokia, Nortel Networks and Siemens, and network service providers
  enable us to ensure interoperability between the end user's personal computer
  and the service provider's network.

 . Provide for Efficient and Cost-Effective Installation. Our ProfileBuilder
  software tool allows a network service provider to pre-configure the customer
  premises equipment to the parameters of a particular network, reducing the
  costs associated with having installers perform these activities during each
  end-user installation.

 . Provide for Cost-Effective Maintenance. Our Advanced Status software allows a
  network service provider to easily monitor, diagnose and often remotely fix
  the customer's problems quickly, which can substantially reduce the network
  service provider's customer support costs.

                                       3
<PAGE>


   Our objective is to be the leading worldwide provider of high-performance
DSL broadband access customer premises equipment for businesses, remote
offices, telecommuters and consumers. To achieve this goal, we intend to
capitalize on our early market acceptance by network service providers and to
leverage our relationships with network equipment vendors. In addition, we will
continue developing enhancements to our current DSL products and expect to
develop products that are capable of processing both voice and data
communications through the same DSL equipment and network. Finally, we plan to
extend our distribution channels to meet the growing demand for broadband
access solutions and increase our brand awareness.

   We sell our products to network equipment vendors and DSL network service
providers. As of March 31, 1999, our products have been deployed by BellSouth,
Covad Communications, Hong Kong Telecom, Singapore Telecom and seven other
network service providers, and purchased by eight network equipment vendors. An
additional 39 network service providers have begun to test our customer
premises equipment solutions.

   We were incorporated in Delaware in 1993. Our principal executive offices
are located at 4201 Spring Valley Road, Suite 1200, Dallas, Texas 75244-3666
and our telephone number is (972) 991-3884. Our Website is located at
http://www.efficient.com. Information contained on our Website does not
constitute part of this prospectus.

                                  The Offering

<TABLE>
<S>                                <C>
Common stock offered.............. 4,000,000 shares
Common stock to be outstanding
 after this offering.............. 36,067,124 shares
Use of proceeds................... For general corporate purposes, principally
                                   working capital, additional sales and
                                   marketing efforts, and potential
                                   acquisitions.
Proposed Nasdaq National Market
 symbol........................... EFNT
</TABLE>
- --------
The above table is based on shares outstanding as of May 31, 1999. However,
this table also includes 3,082,191 shares that will be issued prior to the
closing of this offering upon exercise of presently outstanding warrants for
redeemable convertible preferred stock. These warrants will terminate if not
exercised prior to the closing of this offering. See "Capitalization" and
"Certain Transactions." This table excludes:

  . 6,234,183 shares subject to options outstanding as of May 31, 1999 under
    our stock option plans;

  . 3,700,000 shares reserved for future issuance under our stock option and
    employee stock purchase plans;

  . 167,746 shares issuable upon exercise of outstanding warrants; and

  . 649,350 shares of common stock to be issued to Covad Communications
    through conversion of a convertible promissory note. See "Certain
    Transactions."

                                  ------------
   You should be aware that our fiscal year ends on June 30; thus, a reference
to "fiscal 1998," for example, is to the fiscal year ended June 30, 1998. In
addition, except as otherwise indicated, information in this prospectus is
based on the following assumptions:

  . that all note holders will convert an aggregate of $9.0 million owed to
    them by Efficient into an aggregate of 3,082,191 shares of redeemable
    convertible preferred stock through the exercise of outstanding warrants;

  . that each outstanding share of redeemable convertible preferred stock
    will convert into one share of common stock immediately prior to the
    closing of this offering;

  . that the underwriters' over-allotment option will not be exercised; and

  . that we will file our amended and restated certificate of incorporation.

                                       4
<PAGE>

                   Summary Consolidated Financial Information
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                                                           Nine Months Ended
                             Fiscal Year Ended June 30,        March 31,
                             ----------------------------  ------------------
                               1996      1997      1998      1998      1999
                             --------  --------  --------  --------  --------
<S>                          <C>       <C>       <C>       <C>       <C>
Statement of Operations
 Data:
Net revenues................ $  3,687  $  4,122  $  3,370  $  2,703  $  7,139
Cost of revenues............    2,209     2,386     2,160     1,553     6,699
                             --------  --------  --------  --------  --------
Gross profit................    1,478     1,736     1,210     1,150       440
Loss from operations........   (6,021)   (6,760)   (9,421)   (5,873)  (12,095)
Net loss.................... $ (5,844) $ (6,635) $ (9,291) $ (5,792) $(14,075)
                             ========  ========  ========  ========  ========
Net loss per share:
  Basic and diluted......... $  (2.06) $  (2.19) $  (2.86) $  (1.81) $  (3.77)
                             ========  ========  ========  ========  ========
  Weighted average shares...    2,838     3,027     3,254     3,193     3,807
                             ========  ========  ========  ========  ========
Pro forma net loss per
 share:
  Basic and diluted.........                     $  (0.41)           $  (0.67)
                                                 ========            ========
  Weighted average shares...                       22,886              27,077
                                                 ========            ========
</TABLE>

<TABLE>
<CAPTION>
                                                       March 31, 1999
                                             ----------------------------------
                                                                     Pro Forma
                                               Actual    Pro Forma  As Adjusted
                                             ---------- ----------- -----------
<S>                                          <C>        <C>         <C>
Balance Sheet Data:
Cash and cash equivalents...................  $ 4,596     $6,596      $46,516
Working capital.............................    9,473     11,473       51,393
Total assets................................   17,234     19,234       59,154
Long-term debt, net of discount.............    4,253        --           --
Redeemable convertible preferred stock......   40,408        --           --
Total stockholders' equity (deficit)........  (33,036)    13,625       53,545
</TABLE>

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

   See Note 2 of Notes to Consolidated Financial Statements for an explanation
of the determination of the number of shares used in computing per share data.

   The pro forma numbers reflect:

  .  the issuance subsequent to March 31, 1999 of $2.0 million in long-term
     debt;

  .  the conversion of $9.0 million in outstanding debt (including $2.0
     million of long-term debt issued subsequent to March 31, 1999) into an
     aggregate of 3,082,191 shares of redeemable convertible preferred stock;
     and

  .  the conversion into common stock of all redeemable convertible preferred
     stock immediately prior to the closing of this offering.

   The pro forma as adjusted numbers give effect to our receipt of the
estimated net proceeds from the sale of the 4,000,000 shares of common stock
offered hereby at an assumed initial public offering price of $11.00 per share,
after deducting underwriting discounts and commissions and estimated offering
expenses payable by us. See "Use of Proceeds" and "Capitalization."

   The tables above exclude $5.0 million of convertible debt which issued to
Covad Communications on June 28, 1999 and the 649,350 shares of common stock
which would be issuable on conversion of such debt assuming an initial public
offering price of $11.00 per share.



                                       5
<PAGE>

                                 RISK FACTORS

   You should carefully consider the risks described below before making a
decision to invest in Efficient.

Risks Associated With the Digital Subscriber Line Industry

Sales of our products depend on the widespread adoption of broadband access
services and if the demand for broadband access service does not develop, then
our results of operations and financial condition would be adversely affected.

   Our business would be harmed, and our results of operations and financial
condition would be adversely affected, if the use of broadband access services
does not increase as anticipated, or if our customers' broadband access
services are not well received in the marketplace. Certain critical factors
will likely continue to affect the development of the broadband access
services market. These factors include:

  . inconsistent quality and reliability of service;

  . lack of availability of cost-effective, high-speed service;

  . inability to integrate business applications on the Internet;

  . lack of interoperability among multiple vendors' network equipment;

  . congestion in service providers' networks;

  . inadequate security; and

  . inability to meet growing demands for increasing bandwidth.

   Even if these factors are adequately addressed, the market for broadband
access services to the Internet and corporate networks may fail to develop or
may develop more slowly than anticipated. If this market fails to develop or
develops more slowly than anticipated, our business would be harmed, and our
results of operations and financial condition would be adversely affected.

Many competing technologies may serve our target market, and if the DSL
technology upon which our products is based does not succeed as a
technological solution for broadband access, we would not be able to sustain
or grow our business.

   The market for high-speed data transmission services has several competing
technologies which offer alternative solutions, and the demand for DSL
services is uncertain in light of this competition. The introduction of new
products by competitors, market acceptance of products based on new or
alternative technologies or the emergence of new industry standards could
render our products less competitive or obsolete. If any of these events
occur, we would be unable to sustain or grow our business. Technologies which
compete with DSL are:

  . other access solutions provided by telephone network service providers
    such as dial-up analog modems, integrated services digital networks and
    T1 services;

  . broadband wireless technologies; and

  . broadband cable technologies.

   If these alternatives gain market share at the expense of DSL technologies,
demand for our products would be reduced, and we would be unable to sustain or
grow our business. Additionally, wireless and cable network service providers
are well funded, and cable network service providers have large existing
customer bases. As a result, competition from these companies is intense and
expected to increase.


                                       6
<PAGE>

We depend upon network service providers to deploy DSL technologies and
services in a broad and timely manner, and if they do not, we would be unable
to sell our products.

   If network service providers do not increase their deployment of DSL
services rapidly, we would be unable to sell our products as anticipated, if at
all. Factors that impact deployments include:

  . the demand from end users;

  . a prolonged approval process, including laboratory tests, technical
    trials, marketing trials, initial commercial deployment and full
    commercial deployment;

  . the development of a viable business model for DSL services, including
    the capability to market, sell, install and maintain DSL services;

  . cost constraints, such as installation costs and space and power
    requirements at the network service providers' central offices;

  . varying and uncertain conditions of the installed copper wire, including
    size and length, electrical interference, and crossover interference with
    voice and data telecommunications services;

  . problems of interoperability among DSL network equipment vendors'
    products;

  . evolving industry standards for DSL technologies; and

  . domestic and foreign government regulation.

Risks We Face Within the DSL Industry

Competition within the DSL market is intense and includes numerous established
competitors, and if we are unable to compete effectively, our business would be
harmed.

   Competition in the DSL customer premises equipment market is intense, and we
expect competition to increase. Many of our competitors and potential
competitors have substantially greater name recognition and technical,
financial and marketing resources than we have. If we are unable to compete
successfully, our business will be harmed and our results of operations and
financial condition would be adversely affected. We cannot assure you that we
will have the financial resources, technical expertise or marketing,
distribution and support capabilities to compete successfully. See "Business--
Industry Background" and "--Competition."

   Competitive pressures could adversely affect us in the following ways:

  . reduce demand for our products;

  . cause delays or cancellations of customer orders;

  . cause us to reduce prices on our existing products; or

  . increase our expenses.

Our failure to enhance our existing products or to develop and introduce new
products that meet changing customer requirements and emerging industry
standards would adversely impact our ability to sell our products.

   The market for high-speed broadband access is characterized by rapidly
changing customer demands and short product life cycles. If our product
development and enhancements take longer than planned, the availability of our
products would be delayed. Any such delay would adversely impact our ability to
sell our products and our results of operations and financial condition would
be adversely affected. Our future success will depend in large part upon our
ability to:

  . identify and respond to emerging technological trends in the market;

  . develop and maintain competitive products that meet changing customer
    demands;

                                       7
<PAGE>

  . enhance our products by adding innovative features that differentiate our
    products from those of our competitors;

  . bring products to market on a timely basis;

  . introduce products that have competitive prices; and

  . respond effectively to new technological changes or new product
    announcements by others.

   The technical innovations required for us to remain competitive in the DSL
industry are inherently complex, require long development cycles and sometimes
depend on sole-source suppliers. We will be required to continue to invest in
research and development in order to maintain and enhance our existing
technologies and products, but we may not have sufficient funds available to do
so. Even if we have sufficient funds, these investments may not serve the needs
of customers or be interoperable with changing technological requirements or
standards. We will have to incur most research and development expenses before
the technical feasibility or commercial viability of enhanced or new products
can be ascertained. Our revenues from future or enhanced products may not be
sufficient to recover our associated development costs.

Our current products are not interoperable with certain products offered by
suppliers to our customers and are subject to evolving industry standards. If
our products do not interoperate with our target customers' networks or an
industry standard that achieves market acceptance, customers may refuse to
purchase our products.

   In some cases, network equipment vendors, such as Cisco Systems, Inc., sell
to our target customers proprietary or non-interoperable systems with which our
products will not function. In these cases, potential customers who wish to
purchase DSL customer premises equipment and who have purchased other network
equipment which does not function with our DSL customer premises equipment may
not purchase our products.

   Also, the emergence of new industry standards, whether through adoption by
official standards committees or widespread use by our target customers, could
require us to redesign our products. If such standards become widespread and
our products do not meet these standards, our customers and potential customers
would not purchase our products. In this case, our business would be harmed,
and our financial condition and results of operations would be adversely
affected. The rapid development of new standards increases the risk that
competitors could develop products that would reduce the competitiveness of our
products or could result in greater competition and additional pricing
pressure. If we fail to develop and introduce new products or enhancements in
the face of new industry standards, our product sales would decrease, and our
business would be harmed. See "Business--Competition."

We may not be able to produce sufficient quantities of our DSL products because
we depend on third-party manufacturers. If these manufacturers fail to produce
our products in a timely manner, our ability to fulfill our customer orders
would be adversely impacted.

   Any manufacturing disruption could impair our ability to fulfill orders, and
if this occurs, our revenues would be adversely affected. Solectron Corporation
is currently the sole manufacturer of many of our products. Since third parties
manufacture our products and we expect this to continue in the future, our
success will depend, in significant part, on our ability to have third parties
manufacture our products cost effectively and in sufficient quantities to meet
our customer demand. There are a number of risks associated with our dependence
on third-party manufacturers, including the following:

  . reduced control over delivery schedules;

  . quality assurance;

  . manufacturing yields and costs;

  . the potential lack of adequate capacity during periods of excess demand;

                                       8
<PAGE>

  . limited warranties on products supplied to us;

  . increases in prices; and

  . the potential misappropriation of our intellectual property.

   Any of these risks, if not adequately addressed by our third-party
manufacturers, would harm our business.

   We have no long-term contracts or arrangements with any of our vendors that
guarantee product availability, the continuation of particular payment terms or
the extension of credit limits. The competitive dynamics of our market require
us to obtain components at favorable prices, but we may not be able to obtain
additional volume purchase or manufacturing arrangements on terms that we
consider acceptable, if at all. If we enter into a high-volume or long-term
supply arrangement and subsequently decide that we cannot use the products or
services provided for in the agreement, our business would also be harmed.

We may not be able to produce sufficient quantities of our products because we
obtain certain key components from, and depend on, certain sole-source
suppliers. If we are unable to obtain these sole-source components, we would
not be able to ship our products in a timely manner and our strategic
relationships with our customers would be detrimentally affected.

   We obtain certain parts, components and equipment used in our products from
sole sources of supply. For example, we obtain certain semiconductor chipsets
from Alcatel Microelectronics, Analog Devices, Inc., Texas Instruments
Incorporated, and Conexant Systems, Inc. If we fail to obtain components in
sufficient quantities when required, and are unable to meet customer demand,
our business could be harmed, as our customers would consider purchasing
products from our competitors. We also rely on Texas Instruments Incorporated,
Samsung Semiconductor Inc., and VLSI Technology, Inc. to manufacture our
application specific integrated circuits. Developing and maintaining these
strategic relationships is critical in order for us to be successful. If our
relationships with our equipment vendor and network service provider customers
are harmed as a result of a failure to obtain sole-source components for our
products on a timely basis, our business would be harmed.

   Any of our sole-source suppliers may:

  . enter into exclusive arrangements with our competitors;

  . stop selling their products or components to us at commercially
    reasonable prices; or

  . refuse to sell their products or components to us at any price.

   If we are unable to obtain sufficient quantities of sole-source components
or to develop alternative sources for components for any reason, our business
would be harmed. Furthermore, additional sole-source components may be
incorporated into our future products, thereby increasing our sole-source
supplier risks. If any of our sole-source manufacturers delay or halt
production of any of their components, our business would be harmed, and our
results of operations and financial condition would be adversely affected.

We may be subject to product returns and product liability claims resulting
from defects in our products. Product returns and product liability claims
could result in the failure to attain market acceptance of our products and
harm our business.

   Our products are complex and may contain undetected defects, errors or
failures. The occurrence of any defects, errors or failures could result in
delays in installation, product returns and other losses to us or to our
customers or end users. Any of these occurrences could also result in the loss
of or delay in market acceptance of our products, either of which would harm
our business and adversely affect our operating results and financial
condition. We will likely have limited experience with any problems that may
arise with new products that we introduce.

                                       9
<PAGE>

   Although we have not experienced any product liability claims to date, the
sale and support of our products entail the risk of these claims. A successful
product liability claim brought against us could be expensive, divert the
attention of management from ordinary business activities and, correspondingly,
harm our business.

Risks That May Cause Financial Fluctuations

We have incurred net losses since our inception and expect future losses.
Accordingly, we may not be able to achieve profitability, and even if we do
become profitable, we may not be able to sustain profitability.

   We have incurred net losses in every fiscal quarter and annual period since
inception and expect to continue to operate at a loss for the foreseeable
future. In addition, we had negative cash flow from operations of $6.6 million
in fiscal 1998 and $14.1 million for the first nine months of fiscal 1999. As
of March 31, 1999, we had an accumulated deficit of approximately $41.9
million. Due to our limited operating history and our history of losses, we may
never be able to achieve profitability, and even if we do, we may not be able
to remain profitable. To achieve profitable operations on a continuing basis,
we must successfully design, develop, test, manufacture, introduce, market and
distribute our products on a broad commercial basis.

   Our ability to generate future revenues will depend on a number of factors,
many of which are beyond our control. These factors include:

  . the rate of market acceptance of DSL broadband access;

  . the level of demand for DSL systems that incorporate our products;

  . changes in industry standards governing DSL technology solutions;

  . the extent and timing of new customer transactions;

  . changes in our development schedules and those of system companies that
    provide complementary DSL products, or changes in their levels of
    expenditure on research and development;

  . personnel changes, particularly those involving engineering and technical
    personnel;

  . the costs associated with protecting our intellectual property;

  . regulatory developments; and

  . general economic trends.

   Due to these factors, we cannot forecast with any degree of accuracy what
our revenues will be in future periods or how quickly network service providers
will select our products for use in their systems. In view of these factors, we
may not be able achieve or sustain profitability.

We have a short operating history and, as a result, it is difficult to predict
our future results of operations.

   We have a short operating history upon which to base your investment
decision. We first commenced product shipments in August 1994 and did not
introduce DSL products until March 1998. Due to our limited operating history,
it is difficult or impossible for us to predict future results of operations
and you should not expect future revenue growth to be comparable to our recent
revenue growth. In addition, we believe that comparing different periods of our
operating results is not meaningful, and you should not rely on the results for
any period as an indication of our future performance. Investors in our common
stock must consider our business and prospects in light of the risks and
difficulties typically encountered by companies in their early stages of
development, particularly those in rapidly evolving markets such as ours.


                                       10
<PAGE>

If sales forecasted for a particular period are not realized in that period due
to the lengthy sales cycle of our products, our operating results for that
period would be adversely affected.

   If we fail to realize forecasted sales for a particular period, our
operating results would be adversely affected and our stock price would likely
decline and could decline significantly. The sales cycle of our products is
typically lengthy and involves:

  . a significant technical evaluation;

  . delays associated with network service providers' internal procedures to
    commit to a particular product line offering and approve large capital
    expenditures;

  . time required to deploy new technologies within service providers'
    networks; and

  . testing and acceptance of new technologies.

   For these and other reasons, a sale of our products generally requires six
to 12 months to complete. Furthermore, the announcement and projected
implementation of new standards may affect sales cycles, as network service
providers may choose to delay large-scale deployment of DSL services until
compliant products are available.

Our product cycles tend to be short, and we may incur substantial non-
recoverable expenses or devote significant resources to sales that do not occur
when anticipated.

   In the rapidly changing technology environment in which we operate, product
cycles tend to be short. Therefore, the resources we devote to product sales
and marketing may not generate material revenues for us, and from time to time
we may need to write off excess and obsolete inventory. If we incur substantial
sales, marketing and inventory expenses in the future that we are not able to
recover, and we are not able to compensate for such expenses, our operating
results would be adversely affected. In addition, if we sell our products at
reduced prices in anticipation of cost reductions and we still have higher cost
products in inventory, our business would be harmed, and our results of
operations and financial condition would be adversely affected.

Our operating results in one or more future periods are likely to fluctuate
significantly and may fail to meet or exceed the expectations of securities
analysts or investors, causing our stock price to decline.

   Our operating results are likely to fluctuate significantly in the future on
a quarterly and an annual basis due to a number of factors, many of which are
outside our control. If our operating results do not meet the expectations of
securities analysts or investors, our stock price may decline. We cannot assure
you that this will not occur because of the numerous factors that could cause
our revenues and costs to fluctuate. These factors include the following:

  . the timing and size of sales of our products and services;

  . announcements of new products and product enhancements by competitors;

  . the entry of new competitors into our market, including by acquisition;

  . unexpected delays in introducing new or enhanced products, including
    manufacturing delays;

  . our ability to control expenses;

  . our ability to ship products on a timely basis and at a reasonable cost;

  . the mix of our products sold;

  . the volume and average cost of products manufactured;

  . the type of distribution channel through which we sell our products;


                                       11
<PAGE>

  . the average selling prices of our products; and

  . the effectiveness of our product cost reduction efforts.

   The amount and timing of our operating expenses generally will vary from
quarter to quarter depending on the level of actual and anticipated business
activities. Research and development expenses will vary as we develop new
products. Due to competitive factors in our market, in the past we have
experienced, and we anticipate that we will continue to experience, decreases
in the average selling prices of our products. Due to these and other factors,
our quarterly revenues, expenses and results of operations could vary
significantly in the future, and you should not rely upon period-to-period
comparisons as indications of future performance. See "Management's Discussion
and Analysis of Financial Condition and Results of Operations."

Our customer base is concentrated, and the loss of one or more of our customers
could harm our business.

   Because DSL service relies upon existing telephone lines to reach end users,
a substantial majority of potential DSL end-user accounts in the U.S. and in
other countries are controlled by a relatively small number of network service
providers. If we are not successful in maintaining relationships with these few
network service providers and the network equipment vendors that supply them,
our business will be harmed.

   Although deregulation and increasing competition are expanding our potential
customer base, a small number of customers has accounted for a large portion of
our revenues to date. We sell our DSL products primarily to network service
providers, network equipment vendors and telephone company-aligned
distributors. For the nine months ended March 31, 1999, Covad Communications
Group, Inc. represented 19.6% of our net revenues, and Lucent Technologies Inc.
represented 10.2% of our net revenues. For the fiscal year ended June 30, 1998,
Victron, Inc., a manufacturer for Xylan Corporation, represented 19.6% of our
net revenues, and Telecom Equipment, a distributor for Singapore Telecom,
represented 12.6% of our net revenues. Our top ten customers for the nine
months ended March 31, 1999 accounted for 80.5% of our net revenues. We expect
to continue to be dependent upon a relatively small number of large customers
in future periods, although the specific customers may vary from period to
period. If we are not successful in maintaining relationships with key
customers, and winning new customers, our business would be harmed.

We derive a substantial amount of our revenues from international sources, and
difficulties associated with international operations could harm our business.

   Since inception, a substantial portion of our revenues has been derived from
customers located outside of the United States, and we expect this trend to
continue. Revenues derived from customers located outside of United States
represented 52% of our revenues in fiscal 1998 and 35% of our revenues for the
first nine months of fiscal 1999. We believe that our continued growth and
ability to attain profitability will require us to continue to penetrate
international markets. If we are unable to successfully overcome the
difficulties associated with international operations and maintain and expand
our international operations, our business would be harmed. These difficulties
include:

  . difficulties staffing and managing foreign operations in our highly
    technical industry;

  . changes in regulatory requirements which are common in the
    telecommunications industry;

  . licenses, tariffs and other trade barriers imposed on products such as
    ours;

  . political and economic instability especially in Asia and the Pacific;

  . potentially adverse tax consequences;

  . difficulties obtaining approvals for products from foreign governmental
    agencies which regulate networks;

  . compliance with a wide variety of complex foreign laws and treaties
    relating to telecommunications equipment; and

  . delays or difficulties collecting accounts receivable from foreign
    entities that are not subject to suit in the United States.

                                       12
<PAGE>

   To date, our international sales and component purchases have been
denominated solely in U.S. dollars and, accordingly, we have not been exposed
to fluctuations in non-U.S. currency exchange rates. In the future, a portion
of our international sales may be denominated in currencies other than U.S.
dollars, which would expose us to gains and losses based upon exchange rate
fluctuations. Such gains and losses may contribute to fluctuations in our
operating results.

Risks That May Affect Our Ability to Execute Our Business Plans

We rely on indirect distribution channels and strategic relationships to sell
and manufacture our products, and if we are not able to maintain existing and
develop additional strategic relationships and indirect distribution channels,
our business would be harmed.

   Our business strategy relies on our strategic relationships with network
equipment vendors, network service providers, and suppliers of DSL technology.
If our existing relationships are not successful or our competitors are better
able to develop these relationships, our business would be harmed. End users
typically purchase DSL customer premises equipment from network service
providers, and network service providers may purchase DSL customer premises
equipment from independent network equipment vendors and distributors. We
typically work closely with our potential customers and suppliers to ensure
interoperability of products with customer networks and of components with our
DSL customer premises equipment. In addition, we rely on our strategic
relationships with telephone company-aligned distributors in order to broaden
our distribution network. Also, larger vendors of DSL customer premises
equipment may be able to leverage their size and established distribution
channels to gain a significant competitive advantage over us. We cannot assure
you that we will be able to maintain or expand our existing strategic
relationships or that we will be able to establish new relationships in the
future. See "Business--Strategic Relationships."

We continue to rapidly and significantly expand our operations, and our failure
to manage growth could harm our business and adversely affect our results of
operations and financial condition.

   We have rapidly and significantly expanded our operations, including the
number of our employees, the geographic scope of our activities and our product
offerings. We expect that further significant expansion will be required to
address potential growth in our customer base and market opportunities. Any
failure to manage growth effectively could harm our business and adversely
affect our operating results and financial condition. We cannot assure you that
we will be able to do any of the following, which we believe are essential to
successfully manage the anticipated growth of our operations:

  . improve our existing and implement new operational, financial and
    management information controls, reporting systems and procedures;

  . hire, train and manage additional qualified personnel;

  . expand and upgrade our core technologies; and

  . effectively manage multiple relationships with our customers, suppliers
    and other third parties.

   In the future, we may also experience difficulties meeting the demand for
our products. The installation and use of our products require training. If we
are unable to provide training and support for our products, more time may be
necessary to complete the implementation process and customer satisfaction may
be adversely affected. In addition, our suppliers may not be able to meet
increased demand for our products. We cannot assure you that our systems,
procedures or controls will be adequate to support the anticipated growth in
our operations.

Competition for qualified personnel in the networking equipment and
telecommunications industries is intense, and if we are not successful in
attracting and retaining these personnel, our business would be harmed.

   Our future success will depend on the ability of our management to operate
effectively, both individually and as a group. Therefore, the future success of
our business will also depend on our ability to attract and

                                       13
<PAGE>

retain high-caliber personnel. The loss of the services of any of our key
personnel, the inability to attract or retain qualified personnel in the future
or delays in hiring required personnel, particularly engineers, could harm our
business.

   Because competition for qualified personnel in the networking equipment and
telecommunications industries is intense, we may not be successful in
attracting and retaining such personnel. During 1998, we added 36 employees to
our total work force, representing an increase of approximately 61% from
December 31, 1997. We expect to add additional personnel in the near future,
including direct sales and marketing personnel. There may be only a limited
number of people with the requisite skills to serve in those positions, and it
may become increasingly difficult to hire these people. In addition, we are
actively searching for research and development engineers, who also are in
short supply. Our business will be harmed if we encounter delays in hiring
additional engineers. Furthermore, competitors and others have in the past and
may in the future attempt to recruit our employees. We do not have employment
contracts with any of our key personnel. Although we currently maintain key
person life insurance on our key personnel, we will not continue to maintain it
after the offering.

The loss of the services of one or more of our executive officers or key
employees could harm our business.

   Our executive officers and certain key sales, engineering and management
personnel may not remain with us in the future. Our executive officers and key
personnel and in particular Mark A. Floyd, our Chief Executive Officer, and
Patricia W. Hosek, our Vice President of Engineering, are critical to our
business and its future success. If we lost the services of one or more of our
executive officers or key employees, we would need to devote substantial
resources to finding replacements, and until replacements were found, Efficient
would be operating without the skills or leadership of such personnel, either
of which could have a significant adverse effect on our business. None of our
officers or key employees is bound by agreements for any specific employment
term or covenants not to compete.

Our future success will depend in part on our ability to protect our
proprietary rights and the technologies used in our principal products, and if
we do not enforce and protect our intellectual property or if others bring
infringement claims against us, our business would be harmed.

   We rely on a combination of patent, copyright and trademark laws, trade
secrets, confidentiality provisions and other contractual provisions to protect
our proprietary rights. However, these measures afford only limited protection.
Our failure to adequately protect our proprietary rights may adversely affect
us. Despite our efforts to protect our proprietary rights, unauthorized parties
may attempt to copy aspects of our products or to obtain and use trade secrets
or other information that we regard as proprietary.

   Our means of protecting our proprietary rights in the U.S. or abroad may not
be adequate, and competitors may independently develop similar technologies. In
addition, the laws of some foreign countries do not protect our proprietary
rights as fully as do the laws of the U.S. Issued patents may not preserve our
proprietary position. Even if they do, competitors or others may develop
technologies similar to or superior to our own.

   We may become involved in litigation over proprietary rights. In the event
of an adverse result in any future litigation with third parties relating to
proprietary rights, we could be required:

  . to pay substantial damages, including treble damages if we are held to
    have willfully infringed;

  . to halt the manufacture, use and sale of infringing products;

  . to expend significant resources to develop non-infringing technology; or

  . to obtain licenses to the infringing technology.

   Licenses may not be available from any third party that asserts intellectual
property claims against us, on commercially reasonable terms, or at all. In
addition, litigation frequently involves substantial expenditures and

                                       14
<PAGE>

can require significant management attention, even if we ultimately prevail.
However, there can be no assurance that we would be able to successfully
resolve such disputes in the future.

   From time to time, third parties, including our competitors, have asserted
patent, copyright and other intellectual property rights to technologies that
are important to us. We expect that we will increasingly be subject to
infringement claims as the number of products and competitors in the high-speed
data access market grows and the functionality of products overlaps. See
"Business--Intellectual Property."

Our products and those of our customers are subject to government regulations,
and changes in current or future laws or regulations that negatively impact our
products and technologies could harm our business.

   The jurisdiction of the Federal Communications Commission, or the FCC,
extends to the entire communications industry including our customers and their
products and services that incorporate our products. Future FCC regulations
affecting the broadband access services industry, our customers or our products
may harm our business. For example, FCC regulatory policies that affect the
availability of data and Internet services may impede our customers'
penetration into certain markets or affect the prices that they are able to
charge. In addition, international regulatory bodies are beginning to adopt
standards for the communications industry. Delays caused by our compliance with
regulatory requirements may result in order cancellations or postponements of
product purchases by our customers, which would harm our business and adversely
affect our results of operations and financial condition.

Additional Risks That May Affect Our Stock Price

Our failure or the failure of our key suppliers and customers to be Year 2000
compliant would 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 and organizations
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 we cannot predict with any certainty what adverse effects we may
suffer from Year 2000 compliance issues, possible effects include:

  .  disruptions in basic services such as water, electricity and telephone,
     any of which could require us to close or substantially reduce the level
     of activity at our facilities until service returns to normal;

  .  disruptions in the supply of components and manufactured goods from our
     component suppliers and contract manufacturers if they experience
     disruptions in the delivery of basic services;

  .  disruptions in our ability to ship and receive goods if third-party
     transportation and delivery providers experience disruptions in their
     operations; and

  .  delays in receiving accurate management information from our internal
     accounting and management systems.

   We currently have no contingency plan to address potential interruptions in
the operation of our internal systems or those of third parties upon whom we
depend as a result of Year 2000 noncompliance.

   We may face claims based on Year 2000 issues arising from the integration of
multiple products within an overall network. We may also experience reduced
sales of our products as potential customers reduce their budgets for network
equipment and network services due to increased expenditures on their own Year
2000 compliance efforts. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Year 2000 Issues."

                                       15
<PAGE>

We have broad discretion to use the offering proceeds, and we cannot assure you
that how we invest these proceeds will yield a favorable return.

   Substantially all of the net proceeds of this offering are not allocated for
specific uses other than working capital and general corporate purposes. Thus,
our management will have broad discretion over how these proceeds are used and
could spend most of these proceeds in ways with which the stockholders may not
agree. We cannot assure you that the proceeds will be invested to yield a
favorable return. See "Use of Proceeds."

We may need additional capital in the future, and if we are unable to secure
adequate funds on terms acceptable to us, we may be unable to execute our
business plan.

   If the proceeds of this offering, together with our existing cash balances
and cash flow expected from future operations, are not sufficient to meet our
liquidity needs, we will need to raise additional funds. If adequate funds are
not available on acceptable terms or at all, we may not be able to take
advantage of market opportunities, to develop new products or to otherwise
respond to competitive pressures. This inability would harm our business.

   In addition, we expect from time to time to review potential acquisitions
that would complement our existing product offerings or enhance our technical
capabilities. While we have no current agreements or negotiations underway with
respect to any potential acquisition, any future transaction of this nature
could require potentially significant amounts of capital. Funds may not be
available at the time or times needed, or available on terms acceptable to us.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations."

Our securities have no prior market, and our stock price may decline after the
offering.

   Before this offering, there has not been a public market for our common
stock and an active public market for our common stock may not develop or be
sustained after this offering. If an active public market for our common stock
does not develop, the liquidity of your investment may be limited, and our
stock price may fluctuate or decline below our initial public offering price.
The initial public offering price will be determined by negotiations between us
and the representatives of the underwriters. See "Underwriting" for a
discussion of the factors to be considered in determining the initial public
offering price.

There are substantial shares of common stock eligible for future sale, and such
sales may depress our stock price.

   After this offering, we will have outstanding 36,067,124 shares of common
stock. See "Capitalization" for a discussion of the shares included in and
excluded from this number. The 4,000,000 shares sold in this offering will be
freely tradeable. The remaining shares of common stock outstanding after this
offering will be available for sale, assuming the effectiveness of certain
lock-up arrangements under which the stockholders have agreed not to sell or
otherwise dispose of their shares of common stock, in the public market as
follows:

<TABLE>
<CAPTION>
 Number of
  Shares                   Date of Availability for Sale
 ---------                 -----------------------------
<S>              <C>
    76,250                 , 1999 (date of this prospectus)
   140,938                 , 1999 (90 days after the date of this prospectus)
26,559,412                 , 1999 (after 180 days following the date of this
                  prospectus); and the remaining shares at various times
                  thereafter upon the expiration of one-year holding periods
</TABLE>

   If our stockholders sell substantial amounts of common stock in the public
market, including shares issuable upon the exercise of outstanding options, the
market price of our common stock could fall. See "Shares Eligible for Future
Sale" and "Underwriting."


                                       16
<PAGE>

The net tangible book value of shares purchased in this offering will be
substantially lower than the initial public offering price.

   Investors purchasing stock in this offering will incur substantial and
immediate dilution in net tangible book value of $9.50 per share assuming an
initial public offering price of $11.00. To the extent that currently
outstanding options and warrants are exercised, there will be further dilution
in net tangible book value. See "Dilution" for a definition of the term "net
tangible book value" and further explanation of this risk.

Our principal stockholders and management have the ability to control
stockholder votes regarding changes in control and other actions, and such
control could adversely affect our stock price or lessen any premium over
market price that an acquiror might otherwise pay.

   Our executive officers and directors and their affiliates will own
approximately 51.9% of the outstanding common stock after this offering, or
51.1% if the underwriters' option is fully exercised. These stockholders may
therefore determine the composition of the board of directors, approve all
matters that require stockholder approval and influence management affairs.
This concentration of ownership may delay or prevent a beneficial merger or
discourage a potential acquiror. This level of control could adversely affect
our stock's market price or lessen any premium over market price that an
acquiror might otherwise pay. See "Management" and "Principal Stockholders."

Certain provisions of our charter documents may make acquiring control of our
company more difficult for a third party, which could adversely affect our
stock's market price or lessen any premium over market price that an acquiror
might otherwise pay.

   Our charter documents contain provisions providing for a classified board of
directors, eliminating cumulative voting in the election of directors and
restricting our stockholders from acting without a meeting. These provisions
may make certain corporate actions more difficult and might delay or prevent a
change in control and therefore limit the price that new investors will pay for
our stock. Further, the board of directors may issue up to 10,000,000 new
shares of preferred stock with certain rights, preferences, privileges and
restrictions, including voting rights, without any vote by our stockholders.
Our existing stockholders may be adversely affected by the rights of this
preferred stock. New preferred stock might also be used to make acquiring
control more difficult. We have no current plans to issue shares of preferred
stock. We will also indemnify officers and directors against losses incurred in
legal proceedings to the broadest extent permitted by Delaware law.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

   This prospectus, including the sections entitled "Prospectus Summary," "Risk
Factors," "Management's Discussion and Analysis of Financial Condition and
Results of Operations," and "Business," contains forward-looking statements.
These statements relate to future events or our future financial performance,
and involve known and unknown risks, uncertainties, and other factors that may
cause our actual results, levels of activity, performance or achievements to be
materially different from any future results, levels of activity, performance
or achievements expressed or implied by these forward-looking statements. These
risks and other factors include, among other things, those listed under "Risk
Factors" and elsewhere in this prospectus. In some cases, you can identify
forward-looking statements by terminology such as "may," "will," "should,"
"expects," "intends," "plans," "anticipates," "believes," "estimates,"
"predicts," "potential," "continue," or the negative of these terms or other
comparable terminology. These statements are only predictions. Actual events or
results may differ materially. In evaluating these statements, you should
specifically consider various factors, including the risks outlined under "Risk
Factors." These factors may cause our actual results to differ materially from
any forward-looking statement.

   Although we believe that the expectations reflected in the forward-looking
statements are reasonable, we cannot guarantee future results, levels of
activity, performance or achievements. We are under no duty to update any of
the forward-looking statements after the date of this prospectus to conform
these statements to actual results.

                                       17
<PAGE>

                                USE OF PROCEEDS

   The net proceeds to us from the sale of the 4,000,000 shares of common stock
offered by us are estimated to be $39,920,000, or approximately $46,058,000 if
the underwriters' over-allotment option is exercised in full, at the assumed
initial public offering price of $11.00 per share, after deducting underwriting
discounts and commissions and the estimated offering expenses.

   We intend to use the net proceeds of this offering primarily for general
corporate purposes including working capital and sales and marketing efforts.
We may also use a portion of the net proceeds to acquire complementary
products, technologies or businesses; however, we currently have no commitments
or agreements and are not involved in any negotiations to do so. Pending use of
the net proceeds of this offering, we intend to invest the net proceeds in
interest-bearing, investment-grade securities.

                                DIVIDEND POLICY

   We have never declared or paid any dividends on our capital stock. We
currently expect to retain future earnings, if any, for use in the operation
and expansion of our business and do not anticipate paying any cash dividends
in the foreseeable future.


                                       18
<PAGE>

                                 CAPITALIZATION

   The table below sets forth the following information:

  . the actual capitalization of Efficient as of March 31, 1999;

  . the actual capitalization at March 31, 1999 after giving pro forma effect
    to: (1) the issuance subsequent to March 31, 1999 of $2.0 million in
    long-term debt; (2) the conversion of $9.0 million in long-term debt
    (including $2.0 million of long-term debt issued subsequent to March 31,
    1999) into an aggregate of 3,082,191 shares of redeemable convertible
    preferred stock; and (3) the automatic conversion of all outstanding
    shares of redeemable convertible preferred stock into shares of common
    stock upon completion of this offering; and

  . the pro forma capitalization as adjusted to give effect to the sale of
    4,000,000 shares of common stock at the assumed initial public offering
    price of $11.00 per share in this offering, less underwriting discounts
    and commissions and the estimated offering expenses payable by Efficient.

<TABLE>
<CAPTION>
                                                      March 31, 1999
                                             ---------------------------------
                                                                        Pro
                                                                      Forma As
                                                Actual     Pro Forma  Adjusted
                                             ------------ ----------- --------
                                              (in thousands, except share and
                                                      per share data)
<S>                                          <C>          <C>         <C>
Long-term debt, net of discount............    $  4,253    $    --    $    --
Redeemable convertible preferred stock;
 issuable in series, $0.001 par value,
 31,136,913 shares authorized, 24,720,213
 shares issued and outstanding, actual;
 none issued and outstanding, pro forma and
 pro forma as adjusted.....................      40,408         --         --
Stockholders' equity (deficit):
Common stock, $0.001 par value; 100,000,000
 shares authorized; 3,918,765 shares issued
 and outstanding, actual; 31,721,169 shares
 issued and outstanding, pro forma and
 35,721,169 shares outstanding, pro forma
 as adjusted...............................           4          32         36
Additional paid-in capital.................      24,865      75,689    115,605
Deferred stock option compensation.........     (16,046)    (16,046)   (16,046)
Accumulated deficit........................     (41,859)    (46,050)   (46,050)
                                               --------    --------   --------
Total stockholders' equity (deficit).......     (33,036)     13,625     53,545
                                               --------    --------   --------
Total capitalization.......................    $ 11,625    $ 13,625   $ 53,545
                                               ========    ========   ========
</TABLE>

   This table excludes the following shares:

  . 6,470,575 shares subject to options outstanding as of March 31, 1999
    under our stock option plans;

  . 3,700,000 shares reserved for future issuance under our stock option and
    employee stock purchase plans;

  . 167,746 shares issuable upon exercise of certain outstanding warrants;
    and

  . 649,350 shares of common stock to be issued to Covad Communications
    through conversion of a promissory note issued on June 28, 1999.

   See "Management--Benefit Plans," "Description of Capital Stock" and Notes 8,
9, 10 and 13 of Notes to Consolidated Financial Statements.

                                       19
<PAGE>

                                    DILUTION

   The pro forma net tangible book value of our common stock on March 31, 1999
was $13.6 million, or approximately $0.43 per share. Pro forma net tangible
book value per share represents the amount of our total tangible assets less
total liabilities, divided by the number of shares of common stock outstanding
after giving pro forma effect to (1) the conversion of $9.0 million of long-
term debt into an aggregate of 3,082,191 shares of redeemable convertible
preferred stock through the exercise of certain warrants and (2) the conversion
of all outstanding shares of redeemable convertible preferred stock into
24,720,213 shares of common stock, each as if they had occurred at March 31,
1999. Dilution in pro forma net tangible book value per share represents the
difference between the amount per share paid by purchasers of shares of our
common stock in this offering and the pro forma net tangible book value per
share of our common stock immediately afterwards. After giving effect to our
sale of 4,000,000 shares of common stock offered by this prospectus at the
assumed initial public offering price of $11.00 per share and after deducting
underwriting discounts and commissions and the estimated offering expenses
payable by us, our pro forma net tangible book value would have been $53.5
million, or approximately $1.50 per share. This represents an immediate
increase in pro forma net tangible book value of $1.07 per share to existing
stockholders and an immediate dilution in net tangible book value of $9.50 per
share to new investors.

<TABLE>
<S>                                                               <C>   <C>
Assumed public offering price per share..........................       $11.00
  Pro forma net tangible book value per share as of March 31,
   1999.......................................................... $0.43
  Increase per share attributable to new investors...............  1.07
                                                                  -----
Pro forma net tangible book value per share after the offering...         1.50
                                                                        ------
Dilution in pro forma net tangible book value per share to new
 investors.......................................................       $ 9.50
                                                                        ======
</TABLE>

   This table excludes all options, warrants and convertible debt outstanding
as of, or issued subsequent to, March 31, 1999, other than the warrants to
purchase 3,082,191 shares of redeemable convertible preferred stock that will
be exercised immediately prior to the completion of this offering. See Notes 6,
7 and 13 of Notes to Consolidated Financial Statements. The exercise of
outstanding options and warrants having an exercise price less than the
offering price would increase the dilutive effect to new investors.

   The following table sets forth, as of March 31, 1999, the differences
between the number of shares of common stock purchased from us, the total
consideration and average price per share paid by existing stockholders and by
the new investors, before deducting the underwriting discounts and commissions
and estimated expenses payable by us, assuming an initial public offering price
of $11.00 per share.

<TABLE>
<CAPTION>
                           Shares Purchased      Total Consideration
                         --------------------- ----------------------- Average Price
                           Number   Percentage    Amount    Percentage   Per Share
                         ---------- ---------- ------------ ---------- -------------
<S>                      <C>        <C>        <C>          <C>        <C>
Existing stockholders... 31,721,169    88.8%   $ 56,017,000    56.0%      $ 1.77
New investors...........  4,000,000    11.2      44,000,000    44.0        11.00
                         ----------   -----    ------------   -----
  Total................. 35,721,169   100.0%   $100,017,000   100.0%
                         ==========   =====    ============   =====
</TABLE>

   The existing stockholder information includes warrants to purchase 3,082,191
shares of redeemable convertible preferred stock that will be exercised prior
to the completion of this offering, but excludes all other options, warrants
and convertible debt outstanding as of, or issued subsequent to, March 31,
1999. See "Capitalization" and "Certain Transactions."

   If the underwriters' over-allotment option is exercised in full, the number
of shares held by new public investors will be increased to 4,600,000 or
approximately 12.7% of the total number of shares of our common stock
outstanding after this offering.


                                       20
<PAGE>

                      SELECTED CONSOLIDATED FINANCIAL DATA

   The following selected financial data should be read in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations," and are qualified by reference to the Consolidated Financial
Statements and Notes thereto appearing elsewhere in this prospectus. The
statement of operations data set forth below for the years ended June 30, 1996,
1997 and 1998, and the nine months ended March 31, 1999 and the balance sheet
data at June 30, 1997, 1998 and March 31, 1999, are derived from, and are
qualified by reference to, the audited Consolidated Financial Statements of
Efficient included elsewhere in this prospectus. The statement of operations
data set forth below for the years ended June 30, 1994 and 1995 and the balance
sheet data at June 30, 1995 and 1996 are derived from audited Consolidated
Financial Statements of Efficient not included in this prospectus. The balance
sheet data at June 30, 1994 is derived from unaudited financial statements not
included in this prospectus. The statement of operations data for the nine
months ended March 31, 1998 and balance sheet data at the end of that period
are derived from unaudited interim consolidated financial statements of
Efficient. In the opinion of management, such unaudited consolidated financial
statements have been prepared on the same basis as the audited consolidated
financial statements referred to above and contain all adjustments, consisting
only of normal recurring adjustments, necessary for a fair presentation of
Efficient's financial results and position for the indicated periods and dates.
The historical results are not necessarily indicative of results to be expected
for any future period.

<TABLE>
<CAPTION>
                                                                            Nine Months Ended
                                   Fiscal Year Ended June 30,                   March 31,
                          ------------------------------------------------  ------------------
                            1994      1995      1996      1997      1998      1998      1999
                          --------  --------  --------  --------  --------  --------  --------
                                      (in thousands, except per share data)
<S>                       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Consolidated Statement
 of Operations Data:
Net revenues............  $    500  $  2,314  $  3,687  $  4,122  $  3,370  $  2,703  $  7,139
Cost of revenues........        --     1,125     2,209     2,386     2,160     1,553     6,699
                          --------  --------  --------  --------  --------  --------  --------
Gross profit............       500     1,189     1,478     1,736     1,210     1,150       440
                          --------  --------  --------  --------  --------  --------  --------
Operating expenses:
  Sales and marketing...       238     1,505     2,366     2,409     3,436     2,232     3,856
  Research and
   development..........     1,341     3,405     3,853     4,183     4,389     2,845     5,546
  General and
   administrative.......       692       822     1,082     1,245     1,641     1,197     1,234
  Stock option
   compensation.........        --        --       198       659     1,165       749     1,899
                          --------  --------  --------  --------  --------  --------  --------
   Total operating
    expenses............     2,271     5,732     7,499     8,496    10,631     7,023    12,535
                          --------  --------  --------  --------  --------  --------  --------
Loss from operations....    (1,771)   (4,543)   (6,021)   (6,760)   (9,421)   (5,873)  (12,095)
Interest and other
 income (expense), net..        67       248       177       125       130        81    (1,980)
                          --------  --------  --------  --------  --------  --------  --------
Net loss................  $ (1,704) $ (4,295) $ (5,844) $ (6,635) $ (9,291) $ (5,792) $(14,075)
                          ========  ========  ========  ========  ========  ========  ========
Basic and diluted net
 loss per share(1)......  $  (0.68) $  (1.56) $  (2.06) $  (2.19) $  (2.86) $  (1.81) $  (3.77)
                          ========  ========  ========  ========  ========  ========  ========
Weighted average
 shares(1)..............     2,521     2,750     2,838     3,027     3,254     3,193     3,807
                          ========  ========  ========  ========  ========  ========  ========
Unaudited pro forma
 basic and diluted net
 loss per share(1)......                                          $  (0.41)           $  (0.67)
                                                                  ========            ========
Weighted average shares
 used to compute
 unaudited pro forma
 basic and diluted net
 loss per share(1)......                                            22,886              27,077
                                                                  ========            ========
Consolidated Balance
 Sheet Data:
Cash and cash
 equivalents............  $  1,617  $  2,650  $  1,303  $  3,413  $  7,607  $  4,617  $  4,596
Working capital.........     1,565     3,400     2,619     4,370     7,870     5,457     9,473
Total assets............     3,396     6,357     5,150     6,454    10,667     7,919    17,234
Redeemable convertible
 preferred stock........     4,125    11,155    16,155    23,635    34,743    29,642    40,408
Total stockholders'
 deficit................    (1,716)   (6,008)  (11,643)  (17,610)  (25,374)  (22,671)  (33,036)
</TABLE>
- --------
(1) Note 2 of Notes to Consolidated Financial Statements provides an
    explanation of the determination of the weighted average shares used to
    compute basic and diluted net loss per share and unaudited pro forma basic
    and diluted net loss per share.

                                       21
<PAGE>

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

   The following discussion should be read in conjunction with the Consolidated
Financial Statements and Notes thereto, as well as the other information
included elsewhere in this prospectus.

Overview

   We are a worldwide independent developer and supplier of high-speed DSL
customer premises equipment for the broadband access market. Our DSL solutions
enable telecommunications and other network service providers to provide high-
speed, cost-effective broadband access services over the existing copper wire
telephone infrastructure to both business and residential markets. We therefore
focus on developing and producing single- and multiple-user DSL customer
premises equipment for small- to medium-size businesses, branch offices of
large corporations and consumers. Our DSL products enable applications such as
high-speed Internet access, electronic commerce, remote access, telecommuting
and extensions of corporate networks to branch offices.

   We were incorporated in June 1993. From inception through fiscal 1997, we
primarily focused on developing and selling ATM-based products for local area
network, or LAN, applications. ATM, or asynchronous transfer mode, is a widely-
used transmission technology that breaks data down into individual packets with
unique identification and destination addresses and may be used to transmit
data, voice and video within a network. During fiscal 1997 we began to leverage
our ATM, personal computing environment and networking expertise to develop DSL
modem products for high-speed Internet access. Although we continue to sell ATM
LAN products, we have largely discontinued further development efforts on such
products and are currently focusing on our DSL products. We shipped our first
DSL products in the third quarter of fiscal 1998. Our DSL products, which
accounted for less than three percent of net revenues in fiscal 1998,
represented 87.3% of our net revenues in the third quarter of fiscal 1999. We
expect sales of our ATM LAN products to continue to gradually decrease in
absolute amount over the next one to two years, and to decrease substantially
as a percentage of net revenues during that time.

   We derive our revenues from sales of our SpeedStream family of DSL products
and, to a lesser extent, our ATM LAN products. We sell our DSL products
primarily to network service providers, network equipment vendors and telephone
company-aligned distributors. For the nine months ended March 31, 1999, Covad
Communications represented 19.6% of our net revenues, and Lucent Technologies
represented 10.2% of our net revenues. For the fiscal year ended June 30, 1998,
Victron, a manufacturer for Xylan, represented 19.6% of our net revenues, and
Telecom Equipment, a distributor for Singapore Telecom, represented 12.6% of
our net revenues. Our top ten customers for the nine months ended March 31,
1999 accounted for 80.5% of our net revenues. We expect to continue to be
dependent upon a relatively small number of large customers in future periods,
although the specific customers may vary from period to period.

   Since inception, a substantial portion of our revenues has been derived from
customers located outside of the United States and we expect this trend to
continue. Revenues derived from customers outside the United States represented
52% of our net revenues in fiscal 1998 and 35% of our net revenues for the nine
months ended March 31, 1999. We currently maintain a European sales office in
Amsterdam and are opening an Asian sales office in Singapore in May 1999. We
believe that in order to continue growing and attain profitability, we must
continue to penetrate international markets. Accordingly, we will need to
expand our international operations and to hire qualified personnel for these
operations.

   To date, international sales have been denominated solely in U.S. dollars
and, accordingly, we have not been exposed to fluctuations in non-U.S. currency
exchange rates. In the future, a portion of our international sales may be
denominated in currencies other than U.S. dollars, which would then expose us
to gains and losses based upon exchange rate fluctuations.

   The gross margins on our DSL products have been below the levels that our
business has historically achieved. The lower gross margins on our DSL products
have been a result of manufacturing start-up costs and volume discounts given
to quickly introduce products into the market. While we believe that our gross
margins

                                       22
<PAGE>

will improve in the near term as a result of manufacturing and component cost
reductions, we do not expect to attain gross margins comparable to those we
historically achieved until at least the second half of fiscal 2000. Other
factors that will affect our gross margin include the product mix sold in any
particular period, distribution channels, competitive pressures and levels of
volume discounts.

   Our limited operating history in the DSL market makes it difficult to
forecast our future operating results. To date, we have not achieved
profitability in any quarter or annual period, and as of March 31, 1999, we had
an accumulated deficit of $41.9 million. Although our net revenues have grown
in recent quarters, we cannot be certain that our net revenues will increase at
a rate sufficient to achieve and maintain profitability.

   For the fiscal years 1996, 1997 and 1998 and for the nine months ended March
31, 1999, we accrued an aggregate of $20.0 million in deferred stock option
compensation. This amount represents the difference between the exercise price
of certain stock options granted during such periods and the deemed fair market
value of our common stock at the time of such option grants. We are amortizing
the deferred stock option compensation over the vesting periods of the
applicable options, generally four years. We amortized deferred stock option
compensation in the amounts of $198,000, $659,000, $1.2 million and $1.9
million in fiscal years 1996, 1997 and 1998 and the nine months ended March 31,
1999, respectively. We expect to amortize the remaining deferred stock option
compensation at the rate of approximately $1.2 million per quarter until fully
amortized.

   The following table sets forth, for the periods presented, certain data from
Efficient's consolidated statement of operations expressed as a percentage of
net revenues.

<TABLE>
<CAPTION>
                                                              Nine Months
                                   Fiscal Year Ended          Ended March
                                        June 30,                  31,
                                  ------------------------   ---------------
                                   1996     1997     1998     1998     1999
                                  ------   ------   ------   ------   ------
<S>                               <C>      <C>      <C>      <C>      <C>
Net revenues.....................  100.0%   100.0%   100.0%   100.0%   100.0%
Cost of revenues.................   59.9     57.9     64.1     57.5     93.8
                                  ------   ------   ------   ------   ------
Gross profit.....................   40.1     42.1     35.9     42.5      6.2
                                  ------   ------   ------   ------   ------
Operating expenses:
  Sales and marketing............   64.2     58.4    102.0     82.6     54.0
  Research and development.......  104.5    101.5    130.2    105.2     77.7
  General and administrative.....   29.3     30.2     48.7     44.3     17.3
  Stock option compensation......    5.4     16.0     34.6     27.7     26.6
                                  ------   ------   ------   ------   ------
    Total operating expenses.....  203.4    206.1    315.5    259.8    175.6
                                  ------   ------   ------   ------   ------
Loss from operations............. (163.3)  (164.0)  (279.6)  (217.3)  (169.4)
Interest and other income
 (expense), net..................    4.8      3.0      3.9      3.0    (27.7)
                                  ------   ------   ------   ------   ------
Net loss......................... (158.5)% (161.0)% (275.7)% (214.3)% (197.1)%
                                  ======   ======   ======   ======   ======
</TABLE>

                                       23
<PAGE>

Results of Operations

Nine Months Ended March 31, 1998 and 1999

Net Revenues

   Net revenues consist of product sales, net of allowances for returns. Net
revenues increased 164.1%, from $2.7 million for the nine months ended March
31, 1998 to $7.1 million for the nine months ended March 31, 1999. DSL product
revenues increased from $5,000 for the nine months ended March 31, 1998 to $5.6
million for the nine months ended March 31, 1999. The period-over-period
increases in DSL product revenues reflect the beginning market adoption of our
DSL products, which first became available in the quarter ended March 31, 1998.
The increase in DSL product revenues was partially offset by a decrease in
revenues from our ATM LAN products. ATM LAN product revenues decreased 42%,
from $2.7 million for the nine months ended March 31, 1998 to $1.6 million for
the nine months ended March 31, 1999. The period-over-period decreases in ATM
LAN product revenues reflect the limited focus that we are placing on our ATM
LAN products as we continue our shift toward DSL products. We expect ATM LAN
product revenues to continue to decrease over time.

Cost of Revenues

   Cost of revenues consists of amounts paid to third-party contract
manufacturers, manufacturing start-up expenses and the personnel and related
costs of our manufacturing operation. Cost of revenues increased 331.4% from
$1.6 million for the nine months ended March 31, 1998 to $6.7 million for the
nine months ended March 31, 1999, reflecting the substantial increase in DSL
product sales. Gross margin represented 42.5% of net revenues for the nine
months ended March 31, 1998, compared to 6.2% for the nine months ended
March 31, 1999. Gross margin on our DSL products declined from 20.0% of the
related revenues for the nine months ended March 31, 1998 to a gross loss of
5.9% of the related revenues for the nine months ended March 31, 1999. Our
gross margin was lower in the current period as we focused on bringing our DSL
products to market quickly and as we began to add personnel to our
manufacturing operations in anticipation of higher levels of business going
forward. We took a number of actions that were designed to bring our DSL
products to market quickly but which also adversely affected our gross margins.
These actions included initial volume price discounts for key customers and
incremental costs such as manufacturing start-up, expedite and other
incremental shipping and handling charges associated with initial low volume
manufacturing. We expect that we will continue to incur higher than normal
costs associated with the actions to bring our DSL markets to product quickly
through at least the end of calendar 1999. The higher costs incurred on our DSL
products were partially offset by improved gross margins realized on our ATM
LAN products. Gross margin on our ATM LAN products improved from 42.6% of
related revenues for the nine months ended March 31, 1998, compared to 49.0%
for the 1999 period. The period-to-period increase in gross margins on our ATM
LAN products was a result of manufacturing efficiencies achieved with these
more mature products. As sales of our ATM LAN products continue to decline as a
percentage of our total revenues, any benefit of manufacturing efficiencies,
cost reduction or other gross margin improvements in those products will have a
diminishing beneficial effect on our overall gross margins. We expect our gross
margins to continue to remain below our historical levels through at least the
first half of fiscal 2000 as we continue to focus on quickly bringing our DSL
products to market.

Sales and Marketing Expenses

   Sales and marketing expenses consist primarily of employee salaries,
commissions and benefits, and advertising, promotional materials and trade show
exhibit expenses. Sales and marketing expenses increased 72.8% from $2.2
million for the nine months ended March 31, 1998 to $3.9 million for the nine
months ended March 31, 1999. As a percentage of net revenues, sales and
marketing expenses decreased from 82.6% for the nine months ended March 31,
1998 to 54.0% for the nine months ended March 31, 1999. The substantial
increase in sales and marketing expenses in absolute amounts was attributable
to our aggressive efforts to launch our DSL products. The decrease in such
expenses as a percentage of net revenues was a result of the

                                       24
<PAGE>

rapid increase in DSL revenues. We expect sales and marketing expenses to
increase in dollar amount in future periods as we continue to expand our
domestic and international sales and marketing organization.

Research and Development Expenses

   Research and development expenses consist primarily of personnel and related
costs associated with our product development efforts, including third-party
consulting and prototyping costs. Research and development expenses increased
94.9% from $2.8 million for the nine months ended March 31, 1998 to $5.5
million for the nine months ended March 31, 1999. As a percentage of net
revenues, research and development expenses decreased from 105.2% for the nine
months ended March 31, 1998 to 77.7% for the nine months ended March 31, 1999.
The substantial increase in research and development spending from period to
period was primarily a result of increased personnel and related costs
associated with a larger research and development organization, as well as
design and prototype expenses incurred in connection with the roll-out of our
DSL products. Additionally, research and development spending in fiscal 1998
was partially offset by $850,000 of nonrecurring engineering expenses
reimbursed by third parties. These amounts are treated as an offset to the
related research and development spending. We received no such reimbursements
in the fiscal 1999 period. The decrease in such expenses as a percentage of net
revenues was a result of the rapid increase in DSL revenues. We expect research
and development expenses to increase in dollar amount in future periods as we
continue to expand our research and development organization to develop new
products and technologies.

General and Administrative Expenses

   General and administrative expenses consist primarily of employee salaries
and related expenses for executive, administrative and accounting personnel,
facility costs, insurance costs and professional fees. General and
administrative expenses remained consistent at $1.2 million for the nine months
ended March 31, 1998 and March 31, 1999. As a percentage of net revenues,
general and administrative expenses decreased from 44.3% for the nine months
ended March 31, 1998 to 17.3% for the nine months ended March 31, 1999. The
decrease in such expenses as a percentage of net revenues was a result of the
increase in DSL revenues. We expect general and administrative expenses to
increase in dollar amount in future periods as we continue to build our
infrastructure and as a result of operating as a publicly-held company.

Stock Option Compensation

   During the nine months ended March 31, 1998, stock option compensation
totaled $749,000. For the nine months ended March 31, 1999, this expense
totaled $1.9 million. See Note 8 of Notes to Consolidated Financial Statements
for a discussion of our stock option compensation.

Interest and Other Income (Expense), Net

   Interest and other income (expense), net consists primarily of interest
earned on cash and cash equivalents offset by miscellaneous non-operating
expenses. Interest and other income (expense), net went from income of $81,000
for the nine months ended March 31, 1998 to an expense of $2.0 million for the
nine months ended March 31, 1999. In the quarter ended March 31, 1999, we
borrowed $7.0 million from our existing investors. These notes bear interest at
10% per year, and are payable on the earlier of January 2002 or the completion
of an initial public offering. In connection with these notes, we issued the
investors warrants to purchase 2,397,260 shares of Series H preferred stock at
an exercise price of $2.92 per share. The principal amount of the outstanding
debt will be canceled through the exercise of these warrants. The proceeds were
allocated between the notes and the warrants based on their pro rata fair
values resulting in a discount. As the notes will be canceled in connection
with this offering, the discount is being amortized as interest expense over
six months. Accordingly, we expect the interest related to these notes to be an
expense of approximately $4.1 million for the quarter ending June 30, 1999.
Thereafter, we expect interest and other income (expense), net to vary
depending upon changes in the amount and mix of interest-bearing investments
outstanding during each period.

                                       25
<PAGE>

Income Taxes

   From inception through March 31, 1999, we incurred net losses for federal
and state tax purposes and have not recognized any tax provision or benefit. As
of March 31, 1999, we had approximately $36.0 million of federal net operating
loss carryforwards to offset future taxable income which will begin to expire
in varying amounts beginning in 2008. Given our limited operating history,
losses incurred to date and the difficulty in accurately forecasting our future
results, management does not believe that the recognition of the related
deferred income tax asset meets the criteria required by generally accepted
accounting principles. Accordingly, a 100% valuation allowance has been
recorded. Furthermore, as a result of changes in Efficient's equity ownership
from Efficient's redeemable convertible preferred stock financings, note
financings and this offering, utilization of the net operating losses and tax
credits may be subject to substantial annual limitations due to the ownership
change limitations provided by the Internal Revenue Code of 1986, as amended,
and similar state provisions. The annual limitation may result in the
expiration of net operating losses and tax credits before utilization. See Note
11 of Notes to Consolidated Financial Statements.

Fiscal Years Ended June 30, 1996, 1997 and 1998

Net Revenues

   Net revenues increased 11.8%, from $3.7 million in fiscal 1996 to $4.1
million in fiscal 1997. Net revenues decreased 18.2% to $3.4 million in fiscal
1998. Our DSL products, first introduced in late fiscal 1998, represented less
than 3% of net revenues in that year. Accordingly, for fiscal 1998 and earlier,
sales of DSL products were not a material portion of our business. ATM LAN
product revenues increased from fiscal 1996 to 1997 primarily as a result of
increased sales of higher-priced ATM LAN products. During fiscal 1997, we made
the strategic decision to begin focusing on developing our DSL products and, as
a result, significantly reduced the level of development and support activities
associated with our ATM LAN products. As a result of this change in focus, ATM
LAN product revenues declined from fiscal 1997 to 1998. This decrease was only
slightly offset by sales of prototype DSL products that began in the second
half of fiscal 1998.

Cost of Revenues

   Cost of revenues increased from $2.2 million in fiscal 1996 to $2.4 million
in fiscal 1997, and then decreased to $2.2 million in fiscal 1998, reflecting
the increase in net revenues from fiscal 1996 to 1997 and the subsequent
decrease in net revenues from fiscal 1997 to 1998. Gross margins were 40.1% in
fiscal 1996, 42.1% in fiscal 1997 and 35.9% in fiscal 1998. The improvement in
gross margins from fiscal 1996 to 1997 reflected better pricing that we were
able to obtain from our component suppliers and contract manufacturers, as well
as increased sales of higher margin ATM LAN products. Gross margins decreased
from fiscal 1997 to 1998 as we began to incur manufacturing start-up costs
associated with our DSL products.

Sales and Marketing Expenses

   Sales and marketing expenses remained relatively consistent at $2.4 million
in fiscal 1996 and 1997. The expenses increased 42.6% to $3.4 million in fiscal
1998. The increases in sales and marketing expenses in absolute amount from
fiscal 1997 to 1998 resulted primarily from sales and marketing activities
associated with the launch of our DSL products. These launch costs included
significant personnel-related expenses associated with increasing the size of
our sales and marketing organization, and increased trade show activities and
related travel expenses. Sales and marketing expenses represented 64.2% of net
revenues in fiscal 1996, 58.4% in fiscal 1997 and 102.0% in fiscal 1998. The
decrease in sales and marketing expenses as a percentage of net revenues from
fiscal 1996 to 1997 reflected the growth in net revenues from period to period.
The increases in sales and marketing expenses as a percentage of net revenues
from fiscal 1997 to 1998 were primarily a result of the up front spending
required to launch our DSL products, which only began to constitute a
significant portion of our revenues in fiscal 1999.

                                       26
<PAGE>

Research and Development Expenses

   Research and development expenses increased 8.6%, from $3.9 million in
fiscal 1996 to $4.2 million in fiscal 1997. These expenses increased 4.9% in
fiscal 1998 to $4.4 million. The increase in research and development expenses
in absolute amount from fiscal 1996 to 1997 reflected the beginning of our DSL
product development efforts. In fiscal 1998, we received $850,000 from third
parties for nonrecurring engineering expenses related to certain DSL product
development activity, which was used to offset research and development
spending. Accordingly, while the net amount of research and development
spending in fiscal 1998 was relatively consistent with the fiscal 1997 level,
our gross research and development spending increased 25.2% from fiscal 1997 to
1998. Research and development expenses represented 104.5% of net revenues in
fiscal 1996, 101.5% in fiscal 1997 and 130.2% in fiscal 1998. The slight
decreases in research and development expenses as a percentage of net revenues
from fiscal 1996 to 1997 primarily reflected the higher rate of revenue growth
in fiscal 1997. The substantial increases in research and development expenses
as a percentage of net revenues from fiscal 1997 to 1998 reflected our early
investment in developing our DSL products.

General and Administrative Expenses

   General and administrative expenses increased 15.1%, from $1.1 million in
fiscal 1996 to $1.2 million in fiscal 1997, and 31.8% to $1.6 million in fiscal
1998. The increases in absolute amount of general and administrative spending
from period to period were primarily a result of increases in headcount
associated with building our infrastructure. General and administrative
expenses represented 29.3% of net revenues in fiscal 1996, 30.2% in fiscal 1997
and 48.7% in fiscal 1998. The substantial increase in general and
administrative expenses as a percentage of net revenues in fiscal 1998
primarily reflected lower revenues in that year.

Stock Option Compensation

   For the years ended June 30, 1996, 1997 and 1998 we recorded aggregate
deferred stock option compensation of $1.4 million, $2.3 million and $3.1
million, respectively in connection with stock option grants. Amortization of
deferred stock option compensation was $198,000, $659,000 and $1.2 million for
the years ended June 30, 1996, 1997 and 1998, respectively. See Note 8 of Notes
to Consolidated Financial Statements for a discussion of our deferred stock
option compensation.

Interest and Other Income (Expense), Net

   Interest and other income (expense), net decreased from $177,000 in fiscal
1996 to $125,000 in fiscal 1997, and increased to $130,000 in fiscal 1998.
Interest and other income (expense), net fluctuated during these periods
primarily due to changes in the amount and mix of interest-bearing investments
outstanding during each period.

                                       27
<PAGE>

Quarterly Results of Operations

   The following table sets forth, for the periods presented, certain data from
Efficient's consolidated statement of operations and such data as a percentage
of net revenues. The consolidated statement of operations data have been
derived from our unaudited consolidated financial statements. In management's
opinion, these statements have been prepared on substantially the same basis as
the audited consolidated financial statements and include all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation of the financial information for the periods presented. This
information should be read in conjunction with the Consolidated Financial
Statements and Notes thereto included elsewhere in this prospectus. The
operating results in any quarter are not necessarily indicative of the results
that may be expected for any future period. We have incurred net losses in each
quarter since inception, and we expect to continue to incur losses for the
foreseeable future.

<TABLE>
<CAPTION>
                                                            Quarter Ended
                          -------------------------------------------------------------------------------------
                          September 30, December 31, March 31,  June 30,   September 30, December 31, March 31,
                              1997          1997       1998       1998         1998          1998       1999
                          ------------- ------------ ---------  --------   ------------- ------------ ---------
                                                            (in thousands)
<S>                       <C>           <C>          <C>        <C>        <C>           <C>          <C>
Statement of Operations
 Data:
Net revenues............     $   676      $   833     $ 1,194   $   667       $ 1,174      $ 1,850     $ 4,115
Cost of revenues........         396          413         744       607           863        1,647       4,189
                             -------      -------     -------   -------       -------      -------     -------
Gross profit............         280          420         450        60           311          203         (74)
Operating expenses:
 Sales and marketing....         643          694         895     1,204         1,168        1,303       1,385
 Research and
  development...........       1,044          737       1,064     1,544         1,826        1,790       1,930
 General and
  administrative........         305          346         546       444           339          411         484
 Stock option
  compensation..........         233          241         275       416           433          475         991
                             -------      -------     -------   -------       -------      -------     -------
 Total operating
  expenses..............       2,225        2,018       2,780     3,608         3,766        3,979       4,790
                             -------      -------     -------   -------       -------      -------     -------
Loss from operations....      (1,945)      (1,598)     (2,330)   (3,548)       (3,455)      (3,776)     (4,864)
Interest and other
 income (expense), net..          34           12          35        49            80           30      (2,090)
                             -------      -------     -------   -------       -------      -------     -------
Net loss................     $(1,911)     $(1,586)    $(2,295)  $(3,499)      $(3,375)     $(3,746)    $(6,954)
                             =======      =======     =======   =======       =======      =======     =======

As a Percentage of Net
 Revenues:
Net revenues............       100.0%       100.0%      100.0%    100.0%        100.0%       100.0%      100.0%
Cost of revenues........        58.6         49.6        62.3      91.0          73.5         89.0       101.8
                             -------      -------     -------   -------       -------      -------     -------
Gross profit............        41.4         50.4        37.7       9.0          26.5         11.0        (1.8)
Operating expenses:
 Sales and marketing....        95.1         83.3        75.0     180.5          99.5         70.4        33.6
 Research and
  development...........       154.5         88.5        89.1     231.5         155.5         96.8        46.9
 General and
  administrative........        45.1         41.5        45.7      66.6          28.9         22.2        11.8
 Stock option
  compensation..........        34.5         28.9        23.0      62.4          36.9         25.7        24.1
                             -------      -------     -------   -------       -------      -------     -------
 Total operating
  expenses..............       329.2        242.2       232.8     541.0         320.8        215.1       116.4
                             -------      -------     -------   -------       -------      -------     -------
Loss from operations....      (287.8)      (191.8)     (195.1)   (532.0)       (294.3)      (204.1)     (118.2)
Interest and other
 income (expense), net..         5.0          1.4         2.9       7.3           6.8          1.6       (50.8)
                             -------      -------     -------   -------       -------      -------     -------
Net loss................      (282.8)%     (190.4)%    (192.2)%  (524.7)%      (287.5)%     (202.5)%    (169.0)%
                             =======      =======     =======   =======       =======      =======     =======
</TABLE>

   Our net revenues and results of operations have fluctuated significantly
from quarter to quarter in the past, and we expect these fluctuations to
continue in the future. The following discussion highlights significant events
that have impacted our net revenues and financial results for the seven
quarters in the period ended March 31, 1999.

                                       28
<PAGE>

Net Revenues

   Net revenues increased each quarter beginning in the quarter ended June 30,
1998 due to increased sales of our new DSL products, partially offset in two
quarters by decreased revenues from our ATM LAN products. Sales of our DSL
products have increased significantly quarter to quarter since we introduced
them in the third quarter of fiscal 1998. Net revenues increased in the first
three quarters of fiscal 1998 as demand for our ATM LAN products was
increasing. With the decision to focus on DSL products, we greatly reduced our
sales, marketing and development efforts for our ATM LAN products. As a result,
sales of these products began to decline in the fourth quarter of fiscal 1998,
and have fluctuated during the first three quarters of fiscal 1999. We expect
sales of our ATM LAN products to continue to gradually decrease in absolute
amount over the next one to two years, although sales of such products may
fluctuate from quarter to quarter.

Cost of Revenues

   Cost of revenues has increased in absolute dollars in most quarterly
periods. Gross margins have fluctuated from a high of 50.4% in the second
quarter of fiscal 1998 to a gross loss of 1.8% for the quarter ended March 31,
1999. Gross margins have been adversely affected by volume price discounts for
customers in order to get our DSL products quickly into the marketplace as well
as manufacturing start-up costs and inefficiencies related to the relatively
low manufacturing levels for some of our DSL products.

Operating Expenses

   Operating expenses generally increased in absolute amount from quarter to
quarter during fiscal 1998 and 1999. As a percentage of net revenues, these
expenses fluctuated, in some periods significantly, as a result of the
fluctuations in revenues.

Interest and Other Income (Expense), Net

   Interest and other income (expense), net has varied somewhat from quarter to
quarter, based primarily upon changes in the amount and mix of interest-bearing
investments outstanding during each period. In the quarter ended March 31,
1999, interest and other income (expense), net was an expense of $2.1 million.
As indicated above, this was a result of the note and warrant transaction
consummated in that quarter. After the interest expense associated with that
transaction is fully amortized, we expect interest and other income (expense),
net to increase from historical levels as we invest the proceeds of this
offering pending use in our business.

Liquidity and Capital Resources

   Since inception, we have financed our operations primarily through the sale
of preferred equity securities and, in the quarter ended March 31, 1999,
through borrowings from our investors. We have raised an aggregate of $40.4
million (net of transaction expenses) from the sale of equity securities and an
additional $7.0 million through the recent loan transactions. In addition, we
raised an additional $2.0 million through a loan transaction completed in April
1999.

   At March 31, 1999, we had cash and cash equivalents of $4.6 million. At
March 31, 1999, we did not have a line of credit or other borrowing facility
available, nor did we have any material capital commitments.

   Cash used in operating activities for the nine months ended March 31, 1999
was $14.1 million. Cash used in operating activities was $6.6 million in fiscal
1998, $4.6 million in fiscal 1997 and $5.4 million in fiscal 1996. Cash used in
operating activities has primarily represented funding of our net losses,
partially offset by accounts payable and accrued expenses.

   Cash used in investing activities for the nine months ended March 31, 1999
was $1.3 million. Cash used for investing activities was $572,000 in fiscal
1998, $525,000 in fiscal 1997 and $800,000 in fiscal 1996. In each period,
these amounts related primarily to the purchase of computers and other
equipment used in our development activities and other equipment and furniture
used in our operations.

                                       29
<PAGE>

   Cash provided by financing activities for the nine months ended March 31,
1999 was $12.4 million, consisting of funds raised from issuances of redeemable
convertible preferred stock and borrowings from our investors. See "Certain
Transactions" and Notes 6 and 7 of Notes to Consolidated Financial Statements
for a description of the loan and equity transactions. Cash provided by
financing activities was $11.4 million in fiscal 1998, $7.3 million in fiscal
1997 and $4.8 million in fiscal 1996. In each year, financing activities
consisted primarily of the private placement of redeemable convertible
preferred stock.

   Our future capital requirements will depend upon a number of factors,
including the timing and level of research and development activities and sales
and marketing campaigns. We believe that our cash and cash equivalent balances
and the proceeds from this offering will provide sufficient capital to fund our
operations at least through the end of fiscal 2000. Thereafter, we may require
additional capital to fund our business. In addition, from time to time we
evaluate opportunities to acquire complementary technologies or companies.
Should we identify any such opportunities, we may need to raise additional
capital to fund the acquisitions. There can be no assurance that financing will
be available to us when we need it on favorable terms or at all.

Year 2000 Issues

   Many currently installed computer systems, software products and other
control devices are unable to accept four digit entries to distinguish 21st
century dates from 20th century dates. As a result, many companies' computer
systems, software products and control devices may need to be upgraded or
replaced in order to operate properly in the year 2000 and beyond.

   We have designed our products to be year 2000 compliant. However, there can
be no assurance that our current products do not contain undetected errors or
defects associated with year 2000 date functions. If such errors or defects do
exist, we may incur material costs to resolve them.

   The internal systems used to deliver our services utilize third-party
hardware and software. We have completed an internal systems and processes
review for year 2000 compliance. We have completed our assessment of the year
2000 risks we may encounter, and all identified instances of noncompliance have
been repaired and tested. Any application or system scheduled for replacement
by September 1999 has not been tested. We anticipate completion of final test
and repair procedures on our internal systems and expect to be substantially
year 2000 compliant by the end of September 1999. We have contacted the vendors
of these products in order to gauge their year 2000 compliance. Based on these
vendors' representations, we believe that the third-party hardware and software
we use are year 2000 compliant. There can be no assurance, however, that we
will not experience unanticipated negative consequences, including material
costs, caused by undetected errors or defects in the technology used in our
internal systems.

   We have no specific contingency plan to address the effect of year 2000
noncompliance. If, in the future, it comes to our attention that certain of our
products need modification, or certain of our third-party hardware and software
are not year 2000 compliant, then we will seek to make modifications. In such
cases, we expect such modifications to be made on a timely basis and we do not
believe that the cost of such modifications will have a material effect on our
operating results. There can be no assurance, however, that we will be able to
modify our products, services and systems in a timely and successful manner to
comply with year 2000 requirements, which could have a material adverse effect
on our business.

Recent Accounting Pronouncements

   In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131, "Disclosures about Segments of an
Enterprise and Related Information," ("SFAS No. 131") which establishes
standards for reporting information about operating segments in interim and
annual financial reporting. It also establishes standards for related
disclosures about products and services, geographic areas and major customers.
SFAS No. 131 is effective for fiscal years beginning after December 15, 1997.
SFAS No. 131 did not have a material effect on our consolidated financial
statements.

                                       30
<PAGE>

   In March 1998, the American Institute of Certified Public Accountants
issued Statement of Position 98-1, "Accounting for the Cost of Computer
Software Developed or Obtained for Internal Use." Statement of Position 98-1
is effective for consolidated financial statements for years beginning after
December 15, 1998. Statement of Position 98-1 provides guidance over
accounting for computer software developed or obtained for internal use
including the requirement to capitalize specified costs and amortization of
such costs. We have adopted the provisions of Statement of Position 98-1 for
our year ending June 30, 1999.

   In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivatives and
Hedging Activities," ("SFAS No. 133") which establishes accounting and
reporting standards of derivative instruments, including certain derivative
instruments embedded in other contracts, and for hedging activities. SFAS
No. 133 is effective for fiscal years beginning after June 15, 1999. The
adoption of Statement of Financial Accounting Standards No. 133 is not
expected to have a material effect on our results of operations, financial
position or cash flows as we do not currently hold derivative instruments or
engage in hedging activities.

Disclosures About Market Risk

   The following discusses our exposure to market risk related to changes in
interest rates, equity prices and foreign currency exchange rates. This
discussion contains forward-looking statements that are subject to risks and
uncertainties. Actual results could vary materially as a result of a number of
factors including those set forth in the Risk Factors section.

   As of March 31, 1999, we had short-term investments of $4.6 million.
Substantially all of these short-term investments consisted of highly liquid
investments with remaining maturities at the date of purchase of less than 90
days. These investments are subject to interest rate risk and will decrease in
value if market interest rates increase. A hypothetical increase or decrease
in market interest rates by 10 percent from the March 31, 1999 rates would
cause the fair value of these short-term investments to decline by an
insignificant amount. We have the ability to hold these investments until
maturity, and therefore we do not expect the value of these investments to be
affected to any significant degree by the effect of a sudden change in market
interest rates. Declines in interest rates over time will, however, reduce our
interest income.

   We do not own any equity investments. Therefore, we do not currently have
any direct equity price risk.

   Substantially all of our revenues are realized currently in U.S. dollars.
In addition, we do not maintain significant asset or cash account balances in
currencies other than the United States dollar. Therefore, we do not believe
that we currently have any significant direct foreign currency exchange rate
risk.

                                      31
<PAGE>

                                    BUSINESS

   Efficient Networks is a worldwide developer and supplier of high-speed
digital subscriber line customer premises equipment, or CPE, for the broadband
access market. According to Cahners In-Stat Group, Efficient was ranked as
number five of the top six worldwide producers of digital subscriber line
customer premises equipment in terms of both revenues and number of units
shipped in 1998 and moved up to number three of the top six suppliers in the
first quarter of calendar 1999. Excluding companies that also make digital
subscriber line equipment that is installed at the network operator's facility,
Efficient was ranked as the number one supplier of DSL customer premises
equipment in terms of both revenues and number of units shipped in both of
those periods. Our DSL solutions enable telecommunications and other
communication network service providers to provide high-speed, cost-effective
broadband access services over the existing copper wire telephone
infrastructure. We believe there is significant demand for high-speed broadband
access, especially among business users and consumers who have found current
solutions to be inadequate or too expensive. We therefore focus on developing
and producing single- and multiple-user DSL customer premises equipment for
small- to medium-size businesses, branch offices of large corporations and
consumers. Our DSL products enable applications such as high-speed Internet
access, electronic commerce, remote access, telecommuting and extensions of
corporate networks to branch offices.

Industry Background

The Growing Need for High-Speed Broadband Communications

   The amount of data being carried over the Internet and private
communications networks has grown dramatically and is expected to continue to
grow as the number of users accessing these networks increases. The increase in
the quantity of data being carried over the Internet and private networks also
is being driven by the broadening range of activities for which these networks
are being used. In order to enhance their reach to customers and suppliers,
businesses are increasingly engaging in mission-critical Internet-based
applications, such as electronic commerce, supply chain management, Web
hosting, and global marketing and customer support. Businesses also
increasingly use the Internet to create secure data networks known as virtual
private networks among corporate sites, remote offices and telecommuters.
International Data Corporation estimates that there were approximately ten
million telecommuters in 1998, of which 72 percent used online services at
least once a day. By utilizing the Internet, businesses can streamline internal
operations by facilitating employee communications, e-mail, file sharing, and
research and analysis. Consumers are also increasingly accessing the Internet
to communicate, collect and publish bandwidth intensive information, conduct
retail purchases, and access online entertainment. These growing network-
dependent activities require the transmission of large amounts of data, which
in turn, requires high-speed broadband data access services for end users to
obtain the data reliably and within practical time constraints.

Traditional Access Solutions are Inadequate

   To meet the growing demand for high-speed, high-bandwidth data transmission,
network service providers have installed high-bandwidth fiber optic
transmission equipment, high-speed switches and core routers in the Internet
backbone and in interoffice networks. While this network backbone is capable of
delivering data at very high speeds, an access bottleneck exists between the
ends of these fiber optic networks at telephone companies' central offices and
the end users' premises. The copper line connections between the central office
and the end user are commonly known as the "last mile." Last mile connections
are typically made via dial-up analog or integrated services digital network,
commonly known as ISDN, modems over the copper infrastructure that was
originally built to transmit analog voice signals. Data transmission speed,
otherwise known as bandwidth, is typically expressed in bits per second. Along
the fiber optic network backbone, data moves at speeds up to 2.5 billion bits
per second, or 2.5 Gbps, while analog modems transmit data at rates up to 56.6
thousand bits per second, or 56.6 Kbps, and most ISDN modems transmit at rates
up to 128 Kbps. Even at ISDN speeds, several minutes are often required to
access a media rich Website, and several hours may be required to transfer or
download large files. During this time, the telephone line cannot be used for
any other purpose. This bottleneck frustrates end users and limits the
capability of network service providers to deliver applications such as
efficient Internet access, multimedia entertainment, real-time telecommuting
and branch office internetworking.

   In an effort to provide greater bandwidth, telecommunications network
service providers have traditionally deployed T1 services. A T1 line is a high-
capacity, dedicated telecommunications line which can support data

                                       32
<PAGE>

transmissions rates of up to 1.5 million bits per second, or 1.5 Mbps, which is
roughly 25 times the speed of analog modems. Although T1 services have helped
fill the need for broadband access for large businesses, network service
providers have generally been unable to offer T1 services to small businesses,
remote offices, telecommuters and consumers as a result of the complexity and
high costs of deployment. Because analog and ISDN modem technology fails to
satisfy the bandwidth needs of end users, and T1 access is prohibitively
expensive, network service providers continue to seek alternatives for
providing cost-effective broadband access to both businesses and consumers.
Additionally, the continued growth in both the number of analog modem users and
their time spent connected to the Internet congests many network service
providers' networks while providing them with little or no additional revenue.

Competition is Driving Rapid DSL Deployment

   Until recently, the incumbent local exchange carriers such as Ameritech,
Bell Atlantic, BellSouth, GTE, Pacific Bell, SBC Communications and US West,
were the exclusive operators of the last mile. Since analog dialup modems, ISDN
and T1 services offered over the incumbent local exchange carriers' networks
did not adequately satisfy the demand for cost-effective broadband access for a
majority of users, alternative solutions were developed such as broadband
wireless and cable access. The deployment of these alternative broadband
solutions is now pressuring incumbent local exchange carriers to deliver cost-
effective broadband access to their customers.

   In addition, the Federal Telecommunications Act of 1996 intensified the
competitive environment because that Act requires incumbent local exchange
carriers to lease portions of their networks, including the last mile, to
competitive local exchange carriers. As a result, many new companies, long
distance telephone companies and Internet service providers have applied for
and been granted regulatory approval for competitive local exchange carrier
status. Leading competitive local exchange carriers, including Covad
Communications, MCI WorldCom, NorthPoint Communications, Rhythms NetConnections
and Sprint, are now deploying high-speed services over the copper
infrastructure owned by the incumbent local exchange carriers. In response to
these competitive pressures and in an effort to increase revenues and maintain
their existing customer base, incumbent local exchange carriers are now
beginning to commit the resources necessary to deploy cost-effective, high-
speed data services over their existing copper infrastructure.

   Similar dynamics are occurring internationally. The growth in Internet use,
telecommunications deregulation and competition from alternative broadband
access technologies have caused foreign telephone network service providers to
commit similar resources to broadband access deployment.

   Incumbent local exchange carriers, competitive local exchange carriers and
foreign telephone network service providers are deploying DSL technology as the
cost-effective broadband access solution. DSL technology utilizes sophisticated
data modulation techniques to achieve high-speed data transmission 100 times
faster than analog modems over existing copper telephone wires. A typical
implementation of a DSL solution is shown below:

[Graphic showing a DSL network including routers, switches, servers, DSLAMs and
                                   DSL CPE.]

                                       33
<PAGE>

   The equipment needed to enable a DSL link generally consists of two pieces,
one in the network operator's central office and one at the premises of the
business or consumer. The central office equipment is often called a DSL access
multiplexer, commonly known as a DSLAM, which aggregates data traffic from
multiple DSL links into a common link to a fiber optic network backbone. The
CPE and the DSLAM must also interoperate with the rest of the equipment in a
given network. DSL can enable cost-effective, high-speed data transmission from
the premises of a business or consumer into a DSL network operator's central
office where existing high-capacity networks can then carry data to a
destination across an Internet or other service provider's network.

   The market for DSL services is expanding rapidly. Several incumbent local
exchange carriers and competitive local exchange carriers have begun to offer
DSL services to their customers directly and through Internet service
providers. In April 1998, GTE Network Services announced plans to offer DSL
service in approximately 300 central offices across 16 states. In May 1998,
Pacific Bell announced plans to deploy DSL service to 87 central offices which
would provide service to approximately 650,000 business customers and 4.4
million homes across California. In January 1999, Pacific Bell further
announced it would spend more than $100 million in 1999 to upgrade its DSL
technology and equip 255 central offices. Also in January 1999, Southwestern
Bell announced a rollout to 271 central offices allowing DSL service to reach
over 440,000 businesses and 3.2 million homes. Covad Communications, a
competitive local exchange carrier, announced the availability of its DSL
services in the San Francisco Bay area in December 1997. By May 1998, Covad's
service was available to over one million potential customers. By the end of
1998, Covad extended its DSL offerings to over 6 million businesses and homes
in five major metropolitan areas, and by April 1999, Covad had deployed DSL
capability to over 11.2 million homes and businesses in nine metropolitan
areas.

Existing Customer Premises Solutions are Constraining DSL Deployment

   As these and other network service providers are deploying DSL services,
they are encountering several challenges. In particular, interoperability still
presents substantial technical challenges despite recent industry efforts to
standardize the various implementations of DSL. Service providers are actively
seeking DSL CPE solutions that offer seamless end-to-end interoperability
within their networks. End-to-end interoperability requires that DSL solutions
be compatible with the customer's computer hardware, operating systems,
networking equipment and software, the CPE and DSLAM, and the switching and
routing equipment in the service providers' network. Network service providers
face additional challenges in deployment and maintenance, because DSL services
are typically targeted at branch offices, small businesses or individuals where
no particular level of networking expertise can be assumed. Therefore, to
implement rapid and widespread DSL deployment, it is of primary importance that
DSL CPE provides for simple and cost-effective installation and maintenance.

The Efficient Solution

   Efficient designs and manufactures the SpeedStream family of DSL CPE and
related software as part of an overall solution for high-speed remote access
and data transmission. Our solutions enable DSL deployment, ensure end-to-end
interoperability and provide for efficient and cost-effective installation and
maintenance.

   Enable DSL Deployments. Efficient enables network service providers to
rapidly and cost-effectively deploy DSL services, thereby allowing them to
quickly capture market share in today's intensely competitive environment.
Efficient's products are specifically targeted to small- to medium-size
companies and consumers for applications such as high-speed Internet access,
and to large corporations for applications such as remote access, telecommuting
and extensions of corporate networks to branch offices.

   Ensure End-To-End Interoperability. Efficient's DSL solutions offer seamless
interoperability from the customer's computer through the service providers'
network. To ensure this interoperability, Efficient leverages our core
technology expertise in combination with our relationships with network service
providers, such as Ameritech, BellSouth and Covad Communications, and network
equipment vendors, such as ADC Telecommunications, Advanced Fibre
Communications, Alcatel, Diamond Lane Communications, DSC

                                       34
<PAGE>

Communications, Ericsson, Lucent Technologies, Newbridge Networks, Nokia,
Nortel Networks and Siemens. Since these industry leaders recognize that end-
to-end interoperability is a necessary requirement for full scale DSL
deployment, network equipment vendors have provided us with early releases of
their systems and technologies so that we can ensure that our products will
seamlessly interoperate with their systems. Our relationships with network
service providers and network equipment vendors enable us to maintain and use
one of the most complete DSL interoperability test labs in the industry. In
addition, Efficient actively participates in developing industry-wide standards
to continue to facilitate end-to-end interoperability.

   Provide for Efficient and Cost-Effective Installation. Efficient offers a
full suite of easily installable DSL solutions, including DSL CPE that provides
routing and bridging capabilities which connect seamlessly into multiple user
environments using a standard networking architecture called Ethernet. For
single user environments, Efficient provides internal DSL CPE installed
directly into the end user's computer and external CPE that connect to the end
user's computer by simply plugging into the computer's universal serial bus, or
USB, port. Efficient's internal and universal serial bus modems are supported
by Efficient's ProfileBuilder software which allows the network service
provider to configure the CPE for a particular network before the CPE is sent
out into the field. Pre-configuration of the CPE obviates the cost and time
associated with having installers perform these configuration activities with
each end-user installation.

   Provide for Cost-Effective Maintenance. Efficient offers network service
providers our Advanced Status software, a troubleshooting and diagnostic tool.
With Advanced Status software, a network service provider's customer support
technician can walk an end user through the diagnostic process over the
telephone. This allows the network service provider to easily monitor, diagnose
and often remotely fix the customer's problems quickly, which can substantially
reduce the network service provider's customer support costs. In the event that
a technician needs to be dispatched, Advanced Status provides easy diagnosis
and facilitates on-site repair.

The Efficient Strategy

   Our objective is to be the leading worldwide provider of high-performance
DSL broadband access customer premises equipment for businesses, remote
offices, telecommuters and consumers. Key elements of our strategy include the
following:

   Capitalize upon our Early Market Acceptance by Network Service Providers. We
intend to leverage our products' early market acceptance to extend our market
share. We have been focused on the high-speed network connectivity market for
six years and specifically on the DSL market for three years. Our DSL CPE
products have been deployed by Ameritech, BellSouth, Covad Communications, Hong
Kong Telecom, Singapore Telecom, and six other network service providers. An
additional 39 network service providers have begun to test our CPE solutions.
We intend to build upon this early acceptance of our products to become the
primary provider of DSL CPE to these and other network service providers as
they deploy their DSL networks.

   Leverage Strategic Relationships with Network Equipment Vendors. We intend
to leverage both current and future relationships to continue to promote
Efficient in the industry, extend our sales capabilities, increase our volume
distribution, and build brand awareness. We believe successful deployment of
DSL necessitates close working relationships with network equipment vendors.
Since most network equipment vendors do not have complete DSL CPE solutions,
they typically bundle and sell their network equipment with third-party CPE
solutions. We have established relationships with ADC Telecommunications,
Alcatel, Diamond Lane Communications, DSC Communications, Ericsson, Nokia,
Nortel Networks and Siemens, among others.

   Continued Development of Broadband Access CPE. We intend to continue
developing DSL CPE products that enhance the features of our current line as
well as create new bundled voice and data access products. We are developing
advanced functionality, enhanced routing and bridging capabilities, additional
software, and new products based on different physical interfaces. We are
continually pursuing techniques to reduce product costs. In developing new
technologies and products, we benefit from our relationships with key industry
leaders that offer early visibility into market requirements and deployment
trends.

                                       35
<PAGE>

   Broaden Distribution Channels. We plan to extend our distribution channels
to meet the growing demand for broadband access solutions. When we first
deployed our current generation DSL products, we initially targeted incumbent
local exchange carriers and network equipment providers in order to secure
large contracts, establish credibility in the marketplace and strengthen key
network service provider relationships. We have since built a direct sales
force to target competitive local exchange carriers, foreign telephone network
service providers and Internet service providers as well. Moreover, we are
developing alternative distribution channels such as telephone company-aligned
distributors, traditional two-tier distribution partners, third-party
integrators, and retail partners. To this end, we have recently signed
agreements with Innotrac, Nortel Supply and Sprint North Supply, three leading
telephone company-aligned distributors. We are also expanding our global
presence by extending our international direct sales force, securing additional
international value-added resellers and establishing retail sales abroad.

   Build the Efficient Brand Name. In addition to increasing brand awareness
with network service providers and network equipment vendors, we believe it is
critical to establish brand awareness and differentiation from our competitors
with end customers through superior performance, ease of use and customer
service. We plan to continue building brand awareness of Efficient and
SpeedStream to identify us as the leading provider of DSL CPE solutions. All of
our DSL products, even when deployed by network service providers, carry the
Efficient and SpeedStream brand names. In some instances, we co-brand our
products with prominent network equipment vendors such as Alcatel in order to
build this name recognition. In addition, we plan to increase our investments
in a broad range of marketing programs, including active trade show
participation, advertising in print publications, direct marketing and Web-
based marketing.

Products

   Efficient has developed the SpeedStream family of DSL products that enables
broadband access for businesses and consumers. Our products are designed to
support a number of operating systems, DSL implementations, and network
architectures. Our asymmetric DSL, or ADSL, products provide transmission
speeds of up to 8 Mbps in the downstream direction from the network to the
user, and up to 800 Kpbs in the upstream direction. Our symmetric DSL, or SDSL,
products provide equal upstream and downstream speeds of up to 1.1 Mbps. Our
SpeedStream products are separated into three different product series:

  . 3000 Series -- Designed for the single user and installable into a
    peripheral component interface, or PCI, bus slot within a personal
    computer

  . 4000 Series -- Designed for the single user and connected to a personal
    computer through a universal serial bus port

  . 5000 Series -- Designed to provide routing and/or bridging capabilities
    and allow multiple users to connect through an Ethernet port

   Although SpeedStream products currently account for most of our revenues, we
continue to generate a small portion of our revenues from the sale of our high-
speed ATM local area network products which were originally introduced in 1994.
These ATM products are specifically designed for use in private data
communications networks within office or home environments which are commonly
known as local area networks, or LANs.

   Efficient also provides a full suite of pre-configuration and diagnostic
software tools. Our pre-configuration software, ProfileBuilder, enables network
service providers to architect scalable DSL services and ensures rapid and
reliable installation while reducing or eliminating the need for on-site
configuration. Our diagnostic and troubleshooting software, Advanced Status, is
designed to reduce a network service provider's expense associated with ongoing
maintenance and repair. We believe that these software capabilities can reduce
the overall expense for DSL service deployment and maintenance.

                                       36
<PAGE>

The SpeedStream 3000 Series

   The SpeedStream 3000 Series consists of internal modems which provide high-
speed asymmetric DSL connectivity for a personal computer.

                                          . Installs into any peripheral
                                            component interface bus slot

                                          . Configures using Efficient
                                            ProfileBuilder software for easy
                                            setup

                                          . Includes Efficient Advanced Status
                                            diagnostic software tools for
                                            rapid error diagnosis and
                                            correction

                                          . Supports the four most prevalent
                                            data encapsulation standards to
                                            ensure network interoperability
                                            with Internet Protocol and ATM
                                            networking equipment

                                          . Provides ATM functionality that
                                            enables reliable data transmission

                                          . Offers remote management
                                            capability

                                          . Supports Microsoft Windows 95,
                                            Windows 98 and Windows NT
                                            operating systems
[Picture of SpeedStream 3000 Series]

<TABLE>
<CAPTION>
                                                 SpeedStream 3000 Series
                     --------------------------------------------------------------------------

                                 3010             3020/3021           3041            3060

                     --------------------------------------------------------------------------
 <S>                      <C>                <C>                 <C>             <C>
                          Relies on external      ADC, AFC,          Siemens      Alcatel, DSC
                              DSL modem         Diamond Lane,                    Communications
 DSLAM Interoperability                       Ericsson, Lucent,
                                              Newbridge, Nokia,
                                                   Nortel
- -----------------------------------------------------------------------------------------------
 Calendar Year of First   First half of 1998 First half of 1998/ Expected second  Second half
 Commercial Availability                       Expected second    half of 1999      of 1998
                                                half of 1999
- -----------------------------------------------------------------------------------------------
 Suggested Retail Price          $129               $269              $269            $269
- -----------------------------------------------------------------------------------------------
</TABLE>

                                       37
<PAGE>

 The SpeedStream 4000 Series

   The SpeedStream 4000 Series consists of external modems which provide high-
speed asymmetric DSL connectivity through a personal computer's universal
serial bus port.

                                          . Attaches externally via a personal
                                            computer's universal serial bus
                                            port

                                          . Configures using Efficient
                                            ProfileBuilder software for easy
                                            setup

                                          . Includes Efficient Advanced Status
                                            diagnostic software tools for
                                            rapid error diagnosis and
                                            correction

                                          . Supports the four most prevalent
                                            data encapsulation standards to
                                            ensure network interoperability
                                            with Internet Protocol and ATM
                                            networking equipment

                                          . Provides ATM functionality that
                                            enables reliable data transmission

                                          . Offers remote management
                                            capability

                                          . Supports Microsoft Windows 98
                                            operating system
[Picture of SpeedStream 4000 Series]


<TABLE>
<CAPTION>
                     ----------------------------------------------------------
                                        SpeedStream 4000 Series
                     ----------------------------------------------------------
                              4020/4021           4041              4060
<S>                      <C>                 <C>             <C>
                              ADC, AFC,          Siemens        Alcatel, DSC
                            Diamond Lane,                      Communications
          DSLAM           Ericsson, Lucent,
    Interoperability      Newbridge, Nokia,
                               Nortel
- -------------------------------------------------------------------------------
    Calendar Year of     First half of 1999/ Expected second First half of 1999
    First Commercial       Expected second    half of 1999
      Availability          half of 1999
- -------------------------------------------------------------------------------
 Suggested Retail Price         $299              $299              $299
- -------------------------------------------------------------------------------
</TABLE>

                                       38
<PAGE>

The SpeedStream 5000 Series

The SpeedStream 5000 Series provides high-speed remote asymmetric DSL or
symmetric DSL connectivity for one or more personal computers, workstations or
other network devices over a standard networking architecture called Ethernet.

                                          . Facilitates DSL connectivity for
                                            multiple users via a standard
                                            Ethernet port

                                          . Provides routing and bridging
                                            capabilities (except 5250,
                                            designed for bridging only)

                                          . Pre-configures for rapid network
                                            deployment

                                          . Supports the four most prevalent
                                            data encapsulation standards to
                                            ensure network interoperability
                                            with Internet Protocol and ATM
                                            networking equipment

                                          . Provides ATM functionality that
                                            enables reliable data transmission

                                          . Offers remote management
                                            capability
[Picture of SpeedStream 5000 Series]


<TABLE>
<CAPTION>
                     --------------------------------------------------------------------------
                                                SpeedStream 5000 Series
                     --------------------------------------------------------------------------
                             5010/5621             5250              5650            5660
<S>                     <C>                 <C>                 <C>             <C>
                             ADC, AFC,         Diamond Lane      Diamond Lane    Alcatel, DSC
        DSLAM              Diamond Lane,                                        Communications
   Interoperability      Ericsson, Lucent,
                         Newbridge, Nokia,
                              Nortel
- -----------------------------------------------------------------------------------------------
     ADSL or SDSL              ADSL                SDSL              SDSL            ADSL
- -----------------------------------------------------------------------------------------------
   Calendar Year of     First half of 1998/ Second half of 1998 Expected second Expected second
   First Commercial       Expected second                        half of 1999    half of 1999
     Availability          half of 1999
- -----------------------------------------------------------------------------------------------
Suggested Retail Price         $595                $499              $595            $595
- -----------------------------------------------------------------------------------------------
</TABLE>


                                       39
<PAGE>

ProfileBuilder Software

   Our ProfileBuilder software tool supports all SpeedStream DSL products for
single personal computer environments. ProfileBuilder allows a network system
provider to select configuration settings for the CPE that match its specific
network. This CPE pre-configuration allows a network operator the flexibility
to choose network settings unique to the network's service offerings, without
requiring an end user or an installation technician to individually configure
each unit. Thus, by setting the attributes for DSL, ATM and data encapsulation
prior to installation of the CPE, the speed of DSL equipment installation is
increased. We believe that this ability to pre-configure DSL CPE provides cost
savings for network service providers and allows them to scale their DSL
service offerings rapidly and reliably.

Advanced Status Software

   All SpeedStream DSL products for single-user environments include embedded
diagnostic and troubleshooting software called Advanced Status. During normal
network conditions, the end user is unaware that this software is operating.
However, if network degradation or failure occurs, a customer service
representative can work with the end user to diagnose and isolate problems with
the DSL link, the CPE or the network itself. Advanced Status software provides
information such as status indications and performance statistics for DSL, ATM
and packet communication layers. This information helps identify problems and
determine whether they must be solved at the central office or the customer
premises. Advanced Status software minimizes the need to send a technician to
the customer premises and speeds troubleshooting and repair. We believe that
our Advanced Status software reduces the overall expense of DSL service.

ATM LAN Products

   Prior to developing our SpeedStream product families, Efficient developed
and produced products that were used to provide high-speed connections between
various components on asynchronous transfer mode-based local area networks. We
introduced ATM LAN products in 1994 that were capable of data rates of up to
155 Mbps and introduced 25 Mbps products in 1996 for less demanding
applications. These products utilize the same technology relating to
application specific integrated circuits as our SpeedStream product family and
are geared toward business customers. Also, these products support Windows 95,
Windows NT, Sun OS, and Sun Solaris operating systems. Furthermore, development
of our ATM LAN products required expertise in networking, ATM and personal
computer environments. This expertise provided the foundation for development
and commercialization of our DSL products.

Products under Development

   Efficient is developing a new family of business class products that will
integrate voice and data traffic through a single platform. This family of
products is intended to enable service providers to offer bundled voice and
data services over a single copper connection. We intend to release the first
of these new products in the first half of calendar 2000. We believe that as
competition among network service providers intensifies, the ability to provide
bundled voice and data services will provide competitive differentiation among
network service providers.

   In addition, Efficient is presently working to add new features, enhance
existing features and reduce the cost of our SpeedStream products.
Specifically, we are working to integrate advanced filtering technology,
routing capabilities, advanced management tools and new hardware interfaces
into SpeedStream products.



                                       40
<PAGE>

Technology

   Efficient designs and manufactures DSL CPE as part of an overall solution
for high-speed remote access and data transmission. Efficient's SpeedStream
family of DSL CPE includes products intended for a single user such as a
telecommuter, as well as for multiple users within branch offices or small
businesses. Efficient integrates a diverse set of technologies and expertise,
primarily in the following areas:

  . DSL System Architecture

  . Asynchronous Transfer Mode and Data Encapsulation Techniques

  . Software

  . Application Specific Integrated Circuit Design

  . Routing and Bridging

DSL System Architecture Expertise

   We structure our product architectures to consist of highly modular blocks
of hardware and software. By utilizing our expertise in developing multiple
products with diverse types of DSL technology, we have developed a core set of
hardware and software designs. Consequently, it is a relatively straightforward
activity to restructure the components and develop a new SpeedStream product.
Similarly, as new features are developed, they can be made available across a
number of products all based upon common components. This design modularity
helps Efficient respond quickly to new market requirements.

   Our product architectures use Efficient's proprietary application specific
integrated circuits, or ASICs, as well as chipsets from third-party suppliers.
We believe that the use of our application specific integrated circuits in
conjunction with these third-party chipsets has advantages for CPE performance
and cost. Because DSL signals operate across a broad frequency range, circuits
must be carefully designed to ensure that high performance is achieved without
disrupting other equipment in the end user's home or office (such as
televisions). We believe that our techniques for DSL circuit design, component
selection and layout, emissions shielding and certification testing result in
high-performance products that meet a broad range of emissions and safety
certifications mandated by the Federal Communications Commission, international
regulatory bodies, consumer safety laboratories and network operators.

Asynchronous Transfer Mode and Data Encapsulation Techniques Expertise

   All of our SpeedStream CPE products employ our own ATM hardware and software
technology. ATM technology enables multiple communication sessions to occur
simultaneously and bursty packet traffic to co-exist with delay-sensitive
traffic such as voice or video information. In order to allow this data to be
carried across an ATM network, it must be formatted into fixed-size ATM cells,
a technique known as data encapsulation. ATM and data encapsulation permit a
common network infrastructure to offer diverse services. There are numerous
data encapsulation techniques which network service providers, Internet service
providers or other network operators may implement.

   We have been able to implement these numerous ATM and data encapsulation
techniques because of our prior experience in designing, manufacturing, and
commercializing ATM LAN equipment. Key pieces of silicon and software
technology were re-used from these products to enable rapid development of our
SpeedStream CPE. We believe that this intellectual property, as well as the ATM
networking expertise associated with it, represents one of our key competitive
advantages.

Software Expertise

   Our software engineers have expertise in developing code that addresses the
needs of network service providers. Our modular software architecture enables
re-use of much of our software code across products. This modularity also
enables rapid development of new products. Our knowledge of network operation
and architectures and data encapsulation techniques allows us to write software
that ensures that our products are

                                       41
<PAGE>

interoperable with other network equipment vendors' products. In addition, our
understanding of various operating systems and personal computer environments
allows us to create software that provides for trouble-free installation and
network maintenance. Our software engineers also design, build and operate
comprehensive testing environments to ensure not only that our products are
interoperable, but also offer high performance.

   Efficient has developed a suite of software for our single-user SpeedStream
products that enables communication in a personal computer environment. This
software is commonly called a "driver" and allows application software, such as
e-mail or a Web browser, to send and receive data over the DSL network link,
just as it would over a modem or a LAN connection. By building upon software
source code and skills developed for ATM LAN products, Efficient is able to
support a number of diverse personal computer environments. To date, Efficient
has leveraged our software expertise to develop and release high-performance,
rapidly installing drivers for our SpeedStream 3000 and 4000 Series products.
This software is interoperable with numerous brands and models of personal
computers, operating system environments such as Windows 95, Windows 98 and
Windows NT version 4, and upcoming environments such as Windows 2000.

   Efficient has also developed and released our ProfileBuilder and Advanced
Status software tools. In addition, Efficient works closely with network
service providers to create software specific to their networks, which allows
them to rapidly and reliably deploy and maintain DSL service.

Application Specific Integrated Circuit Design Expertise

   Efficient has developed custom application specific integrated circuits that
enable high-speed ATM networking using peripheral component interface or
universal serial bus attachments. Our application specific integrated circuits
provide high-speed interfaces to the personal computer and also perform several
ATM functions, including segmentation and reassembly functions whereby variable
length packets are converted into fixed size ATM cells. They also perform
traffic shaping functions that control the flow of data from the end user's
equipment into the service provider's network. The use of custom application
specific integrated circuits allows us to better control the cost of our
products and helps ensure their performance and interoperability with diverse
brands of personal computers and network equipment.

Routing and Bridging Expertise

   Efficient's multi-user products offer a shared Ethernet port for local
attachment to a computer network and an ATM DSL port for transmission and
receipt of data across a DSL interface. A bridging device forwards Ethernet
packets between the product's Ethernet port and its ATM DSL port based on
addresses contained in the Ethernet packets. Efficient's Ethernet bridging
products examine addressing information in each packet to determine whether it
should be forwarded between the local Ethernet port and the ATM DSL port. Our
bridging CPE requires little or no configuration, thereby reducing the network
service provider's installation expense. Because all packet forwarding
decisions are made independently of the network protocol carried by the
Ethernet packets, our bridging CPE can support numerous network types,
including older LAN environments such as Novell's IPX or Apple's AppleTalk, as
well as networks based on the Internet Protocol.

   Routers are able to perform much more complex functions than those performed
by bridges including restricting certain types of data from entering the
network and directing data flow based on dynamically assigned Internet protocol
addresses. Efficient's routing products forward Internet Protocol packets based
upon addressing information contained in the packet header. Support for several
different methods of ATM data encapsulation helps ensure network
interoperability. Efficient's routing products provide features that enhance
security and ease network administration for end users, such as packet
filtering, which prevents unwanted access to local servers or other private
resources, and a technique known as network address translation, which masks
the presence of local computers from other computers on the Internet. Our
routing products also implement an address management technique called the
dynamic host configuration protocol that automates the assignment of Internet
protocol addresses to computers attached locally to the router. The network
address translation and dynamic host configuration protocol features of our
routing products can help minimize address interoperability issues, and may be
able to accelerate deployment of DSL services.

                                       42
<PAGE>

   Efficient's routing products include a complete suite of management
capabilities that enable local and remote troubleshooting as well as upgrades
to system configuration or software. This is important as DSL is a complex
technology typically intended for a technologically unsophisticated user base.
We believe that our products' combination of management capabilities which can
be accessed either locally or remotely can help reduce the cost of network
administration for DSL network service providers.

Customers

   Historically, sales of our CPE have been to two main classes of customers:
network equipment vendors who supply DSL central office equipment and DSL
network service providers. To date, Efficient has sold products to eight
network equipment vendors and 11 network service providers. An additional 39
network service providers have begun to test our CPE solutions.

   Network equipment vendors include our products as an element of a complete
solution offered to their network service provider customers. In many cases,
several different network equipment vendors specify our products as the
preferred or bundled CPE in response to bid requests issued by a network
service provider for complete DSL access solutions. Network service providers
will then provide the CPE to end users for access to their DSL network. In some
cases, we sell CPE to the network equipment vendor for resale as part of a
bundled solution to the network service provider. In other cases, we sell
directly to the network service provider.

   The following table sets forth the top 20 customers for our DSL products in
the current fiscal year, categorized by customer type. These customers
accounted for an aggregate of 24.4% of our total revenues in fiscal 1998 and
76.4% of our total revenues for the first nine months of fiscal 1999.


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------
                                                               Telephone Company-Aligned
  Network Equipment Vendors    Network Service Providers        and Other Distributors
- --------------------------------------------------------------------------------------------
  <S>                          <C>                          <C>
  ADC Telecommunications       Ameritech                    Global Technology Integrator
  Alcatel                      Covad Communications*        Innotrac for BellSouth's network
  Diamond Lane Communications  Flashcom                     Semitron
  Ericsson                     Hong Kong Telecom            Telecom Equipment for Singapore
  Lucent Technologies*         Panhandle Telecommunications    Telecom's network*
  Nokia                           Services                  Universe Computers
  Nortel Networks              SourceNet
  Siemens                      Southwestern Bell
- --------------------------------------------------------------------------------------------
</TABLE>


* The customers indicated accounted for 10% or more of our total revenues in
 fiscal 1998 or the first nine months of fiscal 1999.



                                       43
<PAGE>

Strategic Relationships

   We believe that establishing relationships with leaders in DSL technology
and services is critical to our success. Accordingly, we have formed strategic
relationships and, in some cases, entered into joint development agreements
with network service providers, network equipment vendors and developers of DSL
semiconductor technology. We are also pursuing strategic relationships to
ensure that high-volume distribution channels are in place for our products.

Network Service Providers

   Ameritech. Efficient has entered into an agreement to provide DSL CPE to
Ameritech. We have worked closely with the technical and product management
staff responsible for DSL service deployment at Ameritech. We have also
provided early software releases of new products to Ameritech, and have
provided Ameritech with training for both customer service and field support.

   BellSouth. Efficient has entered into a joint promotion agreement with
BellSouth for DSL CPE. BellSouth provides a financial incentive for Internet
service providers that bring customers into the BellSouth DSL service. For the
term of the program, subscribing Internet service providers are offered
SpeedStream CPE at a reduced cost. Efficient has also entered into a supply
agreement with BellSouth. We believe that the joint promotion agreement in
conjunction with the supply agreement with BellSouth will create significant
demand for our products.

   Covad Communications. Efficient has worked closely with Covad to tune the
feature set of our SpeedStream 5250 symmetric DSL bridging modem to their
network requirements. We are working with Covad to develop new products
intended specifically for its network and also are involved in discussions with
Covad about our next-generation products as well. In addition, on June 28,
1999, we issued a $5.0 million convertible promissory note to Covad. That
promissory note will convert into 649,350 shares of common stock upon
completion of this offering assuming an initial public offering price of $11.00
per share.

   Singapore Telecom. Efficient has worked closely with SingTel to provide
customized software with our CPE that is unique to SingTel's advanced Magix DSL
service. We are involved in discussions with SingTel with respect to the
evolution of SingTel's network architecture and service offerings. SingTel has
consistently volunteered to work with us to test our new products.

Network Equipment Vendors

   ADC Telecommunications. ADC is an investor in Efficient and was the first
company with whom we developed a partnership for DSL CPE. ADC has actively
promoted our products to network service providers in conjunction with ADC's
Cellworx central office platform. William L. Martin III, Senior Vice President
of ADC and President of the Business Broadband Group of ADC, is a member of our
board of directors.

   Alcatel. Efficient and Alcatel have established a joint development and
marketing agreement for CPE that is interoperable with Alcatel's DSLAM. We are
working together to develop two successive generations of DSL CPE based around
our universal serial bus, ATM and software technology, and employing Alcatel's
DSL chipsets and software. In certain cases, we co-brand products which are
sold by both Efficient and Alcatel.

   DSC Communications. DSC Communications was recently purchased by Alcatel.
Aside from our relationship with Alcatel and prior to its acquisition, we had
entered into a partnership with DSC for CPE. DSC manufactures the Lightspan
digital loop carrier system. Digital loop carriers enable telecommunications
service providers to extend digital services to locations connected to the
network by analog equipment and typically are employed in DSL service offerings
to extend the number of customers to whom DSL service can be offered. We
believe that our continuing relationship with DSC can increase the exposure of
our CPE into network service providers.

                                       44
<PAGE>

   Ericsson. Efficient and Ericsson have entered into a long term agreement
whereby we supply our SpeedStream 3000 PCI and 4000 USB products. Under the
provisions of this agreement, we are the exclusive supplier to Ericsson of
universal serial bus DSL CPE through the end of 1999. After 1999, we will
provide these products on a non-exclusive basis.

   Nokia. Efficient and Nokia have entered into a purchase and distribution
agreement whereby we supply our SpeedStream 3000 PCI and 4000 USB products.
Under the provisions of this agreement, Nokia resells our products along with
its EKSOS family of DSL equipment and the SpeedLink DSLAM of Diamond Lane.
Nokia recently acquired Diamond Lane Communications.

   Nortel Networks. Efficient has an agreement to supply Nortel with DSL CPE
that is interoperable with Nortel's Universal Edge 9000 access product. Nortel
offers the Universal Edge 9000 to both new and existing customers as an upgrade
for both Nortel's DMS voice switches and its access node digital loop carriers.
Based on this relationship, we are working with Nortel on next-generation
products.

   Siemens. Siemens has been an investor in Efficient since June 1998.
Following its most recent investment in March 1999, Siemens holds an aggregate
of 3,716,800 shares or approximately 13.0% of our outstanding capital stock. We
have worked with Siemens to specifically design and produce certain DSL CPE
that is interoperable with both Siemens' XpressLink D DSLAM and with DSL
interfaces for Siemens' installed base of voice switches. Anthony T. Maher, who
is a member of the board of Siemens AG Information and Communication Networks,
joined our board of directors in April 1999.

Developers of DSL Semiconductor Technology

   Analog Devices. Many of our products use asymmetric DSL technology from ADI.
Efficient was one of two CPE vendors to engage in an early availability program
with ADI for G.lite, a splitterless DSL technology. G.lite is expected to
enable deployment of DSL service without requiring a network service provider
technician to perform on-site wiring changes or installation of CPE.

   Texas Instruments Incorporated. Texas Instruments is an investor in
Efficient. Some SpeedStream products under development use asymmetric DSL
technology from Texas Instruments. We have licensed pieces of our ATM silicon
and software to Texas Instruments, and have assisted in the development of
reference designs for application of Texas Instruments' asymmetric DSL
components. Texas Instruments has provided us with access to its asymmetric DSL
components at most favored prices. Texas Instruments also fabricates one of our
ATM application specific integrated circuits and has provided introductions for
Efficient to personal computer manufacturers who are searching for sources of
DSL CPE.

Telephone Company-Aligned Distributors

   Sprint North Supply. Sprint North Supply is a primary supplier of
telecommunications equipment to Sprint. Many other network service providers
also source networking products from Sprint North Supply. Efficient has entered
into a distribution agreement with Sprint North Supply that enables it to carry
selected members of our SpeedStream product family.

   Nortel Supply. Nortel Supply is a distributor of Nortel and other network
equipment vendors' products. Through our agreement with Nortel Supply,
Efficient leverages Nortel Supply's worldwide distribution capabilities.

   Innotrac. Innotrac is a distributor of consumer telecommunications equipment
for several incumbent local exchange carriers, including BellSouth. Efficient,
Innotrac and BellSouth jointly promote BellSouth's DSL services with
Efficient's SpeedStream CPE. We believe that we can leverage Innotrac's
relationship with several incumbent local exchange carriers, as well as
Innotrac's experience in distributing products in high volume.


                                       45
<PAGE>

Manufacturing

   Efficient outsources the assembly and testing of products and printed
circuit boards to turnkey contract manufacturers. Currently, Solectron Corp.
manufactures the majority of Efficient's products at its facility in Austin,
Texas. Efficient also contracts with Xetel, Inc. for the manufacturing of its
ATM LAN products and a portion of its DSL products in Dallas, Texas. Both of
these manufacturers are certified by the International Standards Organization
for manufacturing and design processes. Efficient plans to engage an additional
contract manufacturer to meet our anticipated manufacturing requirements and to
continue reducing the cost of our products.

   Efficient has a limited in-house manufacturing capability. We have complete
capabilities for final test, packaging and shipping of our products. We perform
comprehensive inspection tests and use statistical process controls to assure
the reliability and quality of our products. Our manufacturing engineers design
and build all test procedures and fixtures for our products. We integrate these
manufacturing tests with the contract manufacturers' build processes. Our
manufacturing personnel work with our design engineers to ensure that the test
environment remains current as DSL technology evolves. We also perform warranty
and repair work at our Dallas facility.

   Efficient's engineers design custom application specific integrated circuits
that are incorporated into the majority of our products. Efficient contracts
with silicon manufacturers to fabricate the application specific integrated
circuits for prototype testing. We perform design verification and simulation
testing at our facilities. After successful completion of these tests, Texas
Instruments, Samsung Semiconductor and VLSI Technology manufacture our
application specific integrated circuits in volume on a turnkey basis. We
purchase only packaged and tested application specific integrated circuits.

   Other than our application specific integrated circuits, we try to use
standard parts and components whenever possible. We currently purchase certain
key parts and components from sole-source suppliers such as Alcatel
Microelectronics, Analog Devices, Conexant Systems and Texas Instruments.

Sales and Marketing

   Since 1996, Efficient has worked closely with network equipment vendors that
supply DSL-based central office equipment. These vendors offer our SpeedStream
products to network service providers as part of a complete, interoperable DSL
solution. We engage in joint sales activities with our partners and regularly
provide them with collateral materials to enable their sales forces to promote
our products. Our relationships with network equipment vendors result in
introductions to large network service providers. In many cases, with DSL
interoperability assured by Efficient and our partners, network service
providers choose to purchase CPE directly from Efficient.

   Efficient also works closely with network service providers to ensure that
our CPE is matched to their DSL service offerings. Initial discussions with
network service providers generally involve our sales, marketing and business
development personnel who work to communicate the strengths of our company and
our products. Detailed responses to request for purchase documents are
submitted to network service providers, often by both Efficient and one or more
network equipment vendors.

   Next, at the network service provider's request, we engage in a technical
certification process involving our system engineers who work in a lab
environment, in some cases for days or weeks, with their counterparts from the
network service provider. We frequently provide informal consultation on
network deployment and testing as well as customized training for network
service providers. In some cases, we create special software releases or
product combinations for major network service providers. While the actual sale
and distribution of CPE varies network by network, this initial relationship-
building stage is critical in every case. We believe that it is difficult to
provide CPE into DSL service offerings without these close relationships with
network service providers.


                                       46
<PAGE>

   We engage in a variety of marketing activities to build brand awareness. We
issue press releases concerning significant product releases, partnerships and
network design wins. We also conduct briefings for analysts and members of the
press. We participate in a number of industry trade shows and pursue speaking
engagements at related events. Efficient uses direct mail campaigns to increase
awareness of our company and our products among Internet service providers, who
are increasingly active in introducing customers to DSL services. Our broad
goals are to continue to increase the awareness of Efficient as a company, and
of our DSL CPE product line brand, SpeedStream.

   As the scope of our marketing efforts expands, our Website continues to be a
strategic resource in disseminating information to interested parties. Our
Website also plays an active role in collecting sales leads, working remotely
with partners and key customers, and performing customer support. In the
future, we believe that our Website may become an important tool for direct
sales of our products.

Research and Development

   We believe that our future success depends on our ability to adapt to the
rapidly changing communications environment, maintain our significant expertise
in core technologies, and continue meeting and anticipating our customers'
needs. We continually review and evaluate technological changes affecting the
telecommunications market and invest substantially in applications-based
research and development. We are committed to an ongoing program of new product
development that combines internal development efforts with joint ventures and
licensing or marketing arrangements relating to new products and technologies
from outside sources.

   Efficient's core research and development activities are focused on both
hardware and software technologies. In our hardware development activities, we
possess significant expertise in application specific integrated circuits
development, analog and mixed signal hardware design, ATM architecture and bus
architectures, such as peripheral component interface and universal serial bus.
In software development, Efficient has particular strengths in data networking
protocols and operating systems, device driver development and traffic
management, and techniques for advanced routing and systems management.

   To enable successful deployment of DSL services, our CPE must be
interoperable with the DSLAM, ATM switching equipment and other networking
equipment from multiple vendors. In our development efforts, we leverage our
relationships with prominent DSLAM vendors to ensure DSL interoperability. The
continued development and use of our own industry-tested application specific
integrated circuits and software ensure ATM switching interoperability. In
addition, our support for a number of protocol stacks provides data
encapsulation interoperability with routers at Internet service providers or
within corporate networks. Efficient has a solid understanding of the end-to-
end technologies in use, and we actively work to ensure interoperability while
using technology that we control. Our design verification procedures include
testing in complex network environments created in our laboratories that
simulate end-to-end network architectures used in DSL service deployments. We
believe that our stringent design verification and test procedures allow us to
provide cost-effective, high-performance DSL CPE that minimizes the technology
risk for network operators.

   Most of the technology associated with Efficient's SpeedStream products
continues to evolve. asymmetric DSL supports high frequency digital data
transmission simultaneously with analog voice signals on a single copper phone
line. Digital data and analog voice have the capability to disrupt one another.
One common method of minimizing this disruption is to electrically separate the
voice signals from the data signals using a circuit known as a filter or a
"splitter." At present, the use of a splitter often requires a network
technician or the end user to install the device using hand tools and to modify
phone wiring inside a home or business. We are currently researching analog
filtering circuit technology and are working with other companies to enable
filter designs that can be installed without tools or changes to interior
wiring.

   Another future technology involves ATM switched virtual circuits. Switched
virtual circuits create a dedicated connection between two points of a network.
Current ATM/DSL deployments typically use permanent virtual circuits to create
these dedicated connections. Permanent virtual circuits must be created
manually, while switched virtual circuits employ software to automatically
create a circuit across the ATM

                                       47
<PAGE>

network without manual intervention. Some network operators have expressed a
concern that DSL deployments may not scale rapidly if permanent virtual
circuits are employed. Switched virtual circuit implementations are complex and
may represent a technology barrier for competitors. Efficient has sold ATM LAN
products supporting switched virtual circuits for several years. We believe we
are well suited to help enable large-scale DSL deployments as network operators
demand support for switched virtual circuits.

Competition

   The network equipment industry is highly competitive, and we believe that
competition may increase substantially as the introduction of new technologies,
deployment of broadband networks and potential regulatory changes create new
opportunities for established and emerging companies. In addition, a number of
our competitors and potential competitors have significantly greater financial
and other resources than us which may enable them to more aptly meet new
competitive opportunities. We compete directly with other providers of DSL CPE
including 3Com, Alcatel, Cisco Systems, FlowPoint and Netopia, among others.
Other vendors with whom we compete also have proprietary systems with which our
products are not interoperable. Included among these vendors are Cisco Systems,
Orckit Communications, PairGain Technologies and Westell Technology. In
addition, a number of potential competitors, such as Intel Corporation,
Matsushita which markets its products under the Panasonic name, Sony
Corporation, SGS-Thomson and Toshiba America, may enter the DSL CPE market.
Furthermore, DSL as a technology for deploying broadband connections is
competing with alternative technologies including ISDN, T1, broadband wireless
and cable solutions.

   The rapid technological developments within the network equipment industry
results in frequent changes to our group of competitors. The principal
competitive factors in our market include:

  . Industry relationships with network service providers and network
    equipment vendors;

  . product reliability, performance and interoperability;

  . product features;

  . product availability;

  . price;

  . ability to distribute products;

  . ease of installation and use;

  . technical support and customer service; and

  . brand recognition.

   We believe we are successfully addressing each of these competitive factors.
Nonetheless, we expect to face increasing competitive pressures from both
current and future competitors in the markets we serve.

Intellectual Property

   We rely on a combination of copyright, patent, trademark, trade secret and
other intellectual property laws, nondisclosure agreements and other protective
measures to protect our proprietary rights. We also utilize unpatented
proprietary know-how and trade secrets and employ various methods to protect
our trade secrets and know-how. To date, we have been granted one U.S. patent
with counterpart patents pending in three international jurisdictions and have
an additional nine U.S. patent applications pending.

   Although we employ a variety of intellectual property in the development and
manufacturing of our products, we believe that none of our intellectual
property is individually critical to our current operations. However, taken as
a whole, we believe our intellectual property rights are significant and that
the loss of all or a substantial portion of such rights could have a material
adverse effect on our results of operations. There can

                                       48
<PAGE>

be no assurance that our intellectual property protection measures will be
sufficient to prevent misappropriation of our technology. In addition, the laws
of many foreign countries do not protect our intellectual properties to the
same extent as the laws of the United States. From time to time, we may desire
or be required to renew or to obtain licenses from others in order to further
develop and market commercially viable products effectively. There can be no
assurance that any necessary licenses will be available on reasonable terms.

   We have registered the trademarks "Efficient Networks" and "SpeedStream."
"Advanced Status" and "ProfileBuilder" are also our trademarks. All other
trademarks or service marks appearing in this prospectus are trademarks or
service marks of the respective companies that use them.

Employees

   As of March 31, 1999, we employed approximately 104 full-time employees,
including 27 in sales and marketing, 12 in manufacturing, 54 in engineering,
nine in finance and administration and two in customer service. Most of our
employees are located in the United States with six sales and sales engineering
employees located in The Netherlands. None of our employees is represented by
collective bargaining agreements, and management considers relations with our
employees to be good.

Properties

   We lease an approximately 26,000 square foot facility in Dallas, Texas for
executive offices and for administrative, sales and marketing, and research and
development purposes. The lease for this facility expires in 2001. We also
lease an approximately 11,000 square foot facility in Dallas, Texas for
manufacturing, shipping and receiving of product. This lease also expires in
2001. Additionally, we lease an approximately 2,500 square foot facility in
Amsterdam, The Netherlands for our European operations. This lease expires in
2004.

Legal Proceedings

   Efficient is not a party to any material legal proceedings.

                                       49
<PAGE>

                                   MANAGEMENT

Executive Officers and Directors

   The following table sets forth certain information with respect to the
executive officers, directors and a director nominee of Efficient as of April
30, 1999.

<TABLE>
<CAPTION>
          Name            Age                       Position
          ----            ---                       --------
<S>                       <C> <C>
Mark A. Floyd............  43 Chairman of the Board, Chief Executive Officer and
                              President
Paul E. Couturier........  37 Vice President of International Operations
Patricia W. Hosek........  37 Vice President of Engineering
Gregory L. Langdon.......  38 Vice President of Marketing
Jill S. Manning..........  36 Vice President and Chief Financial Officer
David B. Stefan..........  36 Vice President of Sales
Bruce W. Brown...........  49 Director
James P. Gauer...........  47 Director
Robert A. Hoff...........  46 Director
Anthony T. Maher.........  53 Director
William L. Martin III....  51 Director
Thomas H. Peterson.......  42 Director
Robert Hawk..............  59 Director Nominee
</TABLE>

   Mark A. Floyd co-founded Efficient in June 1993 and has served as President,
Chief Executive Officer and a director of Efficient since its inception. Prior
to founding Efficient, from June 1991 to July 1993, Mr. Floyd was Chief
Operating Officer and a director of Networth, Inc., a provider of LAN products
including Ethernet hubs, switches and network interface cards. From May 1984 to
June 1991, Mr. Floyd held the positions of Executive Vice President, Chief
Financial Officer and director of Interphase Corporation, a provider of
enterprise server connectivity solutions for high-speed LAN, high capacity
storage and remote access applications. Mr. Floyd holds a B.B.A. in Finance
from the University of Texas at Austin.

   Paul E. Couturier has served as Efficient's Vice President of International
Operations since February 1997. From March 1995 to February 1997, he served as
Efficient's Managing Director, Europe. From June 1993 to January 1995, he was
Pan-European Business Development Manager at SynOptics, a manufacturer of
synthetic crystals and optical products. Prior to that, Mr. Couturier held the
position of Director of Sales and Marketing at Gandalf Benelux, a division of
Mitel Corporation dedicated to the corporate access segment of the remote
access market. Mr. Couturier has a bachelors degree in Marketing and in Foreign
Languages from the University of Amsterdam.

   Patricia W. Hosek has served as Vice President of Engineering of Efficient
since February 1997. From October 1995 to February 1997, she served as
Efficient's Director of Software Engineering. From December 1990 to October
1995, she worked as a senior manager and developer at DSC Communications
Corporation, a global provider of telecommunications products. Ms. Hosek holds
a B.S. in Computer Science from Texas A&M University.

   Gregory L. Langdon has served as Vice President of Marketing of Efficient
since February 1997. From February 1996 to February 1997, he served as
Efficient's Director of Product Management. From January 1990 to February 1996,
he worked as an engineer at DSC Communications Corporation. Mr. Langdon holds a
B.S. in Electrical Engineering from Vanderbilt University.

   Jill S. Manning has served as Vice President and Chief Financial Officer of
Efficient since February 1997. From November 1994 to February 1997, she served
as Efficient's Controller. From July 1984 to November 1994, Ms. Manning was a
senior manager at KPMG LLP, an international accounting firm. Ms. Manning holds
a B.B.A. in Accounting and in Computer Information Systems from Baylor
University.

                                       50
<PAGE>

   David B. Stefan has served as Vice President of Sales of Efficient since
October 1997. From March 1997 to October 1997, Mr. Stefan worked as Vice
President of Sales of Dagaz Technologies, a manufacturer of telecommunications
equipment that was acquired by Cisco Systems in September 1997. From May 1996
to March 1997, Mr. Stefan held the position of Director of Sales of Sourcecom
Corporation, a computer networking equipment and software reseller. From
November 1992 to May 1996, he worked as a territory manager and system engineer
for Primary Access, a division of 3Com Corporation, a computer networking
products company. Mr. Stefan holds an M.S.E.E. from George Washington
University and a B.S. in Electrical Engineering from Michigan State University.

   Bruce W. Brown has served as a director of Efficient since October 1995.
Since August 1995, he has served as President, Chief Executive Officer and a
director of Vertel Corp., a provider of telecommunications network management
software and services. From July 1993 to August 1995, Mr. Brown held the
positions of President and Chief Executive Officer of ADC Fibermax Corporation,
a supplier of fiber optic networking products. Mr. Brown holds an M.P.A. from
Drake University and a B.S. in Psychology from Iowa State University.

   James P. Gauer has served as a director of Efficient since July 1993. Since
April 1999, he has been a General Partner of Palomar Ventures, and from
December 1992 to November 1997, he was a General Partner of Enterprise
Partners, both of which are venture capital firms and investors in Efficient.
Mr. Gauer holds a B.A. in Mathematics from the University of California, Los
Angeles.

   Robert A. Hoff has served as a director of Efficient since July 1993. Since
1983, he has been a General Partner of Crosspoint Venture Partners, a venture
capital firm and investor in Efficient. Mr. Hoff also serves as a director of
Com21, Inc., PairGain Technologies, Inc., Onyx Acceptance Corp. and U.S.
Web/CKS Corporation. Mr. Hoff holds an M.B.A. from Harvard University and a
B.S. in Business Administration from Bucknell University.

   Anthony T. Maher was appointed to Efficient's board of directors in April
1999. Mr. Maher is a member of the board of Siemens AG Information and
Communication Networks. Siemens, a network equipment vendor, is an investor in
Efficient. Since May 1978, Mr. Maher has held various positions with Siemens,
including the following positions within the Siemens Public Communication
Networks Group: October 1997 to September 1998, member of the board of
directors; October 1995 to September 1997, Executive Director; and January 1993
to September 1995, Executive Director of Worldwide Product Planning. Prior to
his positions within the Public Communication Networks Group, Mr. Maher was
manager and then deputy director of system engineering for EWSD architecture
and processor technology. Mr. Maher holds a M.S. in Electrical Engineering and
Solid State Physics from the University of Illinois.

   William L. Martin III has served as a director of Efficient since January
1997. Since September 1994, Mr. Martin has been Senior Vice President of ADC
Telecommunications, Inc. and President of the Business Broadband Group of ADC
Telecommunications, Inc., a provider of communications networks systems and
solutions and an investor in Efficient. Mr. Martin holds an M.B.A. from Harvard
University, an M.S. of Aerospace Engineering and a B.S. in Engineering from the
California Institute of Technology.

   Thomas H. Peterson has served as a director of Efficient since July 1993.
Since July 1994, Mr. Peterson has served as director of Rogue Wave Software,
Inc., a provider of software solutions for creating and managing enterprise
systems. Since May 1991, Mr. Peterson has been a General Partner of El Dorado
Ventures, a venture capital firm and investor in Efficient. Mr. Peterson holds
an M.B.A. from the University of California, Los Angeles and a B.S. in
Electrical Engineering from Iowa State University.

   Robert Hawk has been nominated to serve as a member of Efficient's board of
directors. Mr. Hawk is President of Hawk Communications and recently retired as
President and Chief Executive Officer of US West Multimedia Communications,
Inc., where he headed the cable, data and telephony communications business
from May 1996 to April 1997. He was president of the Carrier Division of US
West Communications, a regional telecommunications service provider, from
September 1990 to May 1996. Prior to that time, Mr. Hawk

                                       51
<PAGE>

was Vice President of Marketing and Strategic Planning for CXC Corporation.
Prior to joining CXC Corporation, Mr. Hawk was director of Advanced Systems
Development for AT&T/American Bell. He currently serves on the boards of Covad
Communications Group, Inc., PairGain Technologies, Inc., Concord
Communications, Radcom and Com21.

Classified Board

   Our board of directors is currently composed of seven members. Upon
completion of this offering, our certificate of incorporation will provide for
a classified board of directors consisting of three classes of directors, each
serving staggered three-year terms. As a result, a portion of our board of
directors will be elected each year. To implement the classified structure,
prior to the consummation of the offering, two of our directors will be elected
to one-year terms, two will be elected to two-year terms and three will be
elected to three-year terms. Thereafter, directors will be elected for three-
year terms. Messrs. Maher and Martin have been designated Class I directors
whose term expires at the 1999 annual meeting of stockholders. Messrs. Floyd
and Peterson have been designated Class II directors whose term expires at the
2000 annual meeting of stockholders. Messrs. Brown, Gauer and Hoff have been
designated Class III directors whose term expires at the 2001 annual meeting of
stockholders. See "Description of Capital Stock--Delaware Anti-Takeover Law and
Certain Charter and Bylaw Provisions."

   Executive officers are appointed by the board of directors on an annual
basis and serve until their successors have been duly elected and qualified.
There are no family relationships among any of our directors, officers or key
employees.

Board Committees

   We established an audit committee and a compensation committee in April
1999.

   Our audit committee consists of Messrs. Martin and Hoff. The audit committee
reviews our internal accounting procedures and consults with and reviews the
services provided by our independent accountants.

   Our compensation committee consists of Messrs. Brown and Gauer. The
compensation committee reviews and recommends to the board of directors the
compensation and benefits of our employees. The compensation committee also
administers our stock-based employee benefit plans.

Compensation Committee Interlocks and Insider Participation

   Prior to establishing the compensation committee, the board of directors as
a whole performed the functions delegated to the compensation committee. No
member of the board of directors or the compensation committee serves as a
member of the board of directors or compensation committee of any entity that
has one or more executive officers serving as a member of our board of
directors or compensation committee.

Director Compensation

   Directors do not currently receive any cash compensation from us for their
service as members of the board of directors. Directors are eligible to receive
option grants under our 1999 Stock Plan. For a description of this plan, see
"--Benefit Plans." In December 1996, the board granted options to Mr. Brown to
purchase 100,000 shares of common stock with an exercise price of $0.25 per
share. During fiscal 1999, the board granted to each of Messrs. Gauer, Hoff,
Martin and Peterson options to purchase 50,000 shares of common stock with an
exercise price of $1.50 per share. During May 1999, the board granted to Mr.
Maher and Robert Hawk, who is expected to join the board after this offering,
options to purchase 15,000 and 150,000 shares of common stock, respectively,
with an exercise price of $10.50 per share.

                                       52
<PAGE>

Executive Compensation

Summary Compensation Table

   The table below sets forth the compensation earned for services rendered to
Efficient in all capacities for the fiscal year ended June 30, 1998 by our
Chief Executive Officer and our next four most highly compensated executive
officers who earned more than $100,000 during fiscal 1998. These executives are
referred to as the "named executive officers" elsewhere in this prospectus.

<TABLE>
<CAPTION>
                                                       Long-Term
                                                      Compensation
                                                         Awards
                                                      ------------
                                          Annual       Securities
                                       Compensation    Underlying
                                     ---------------- ------------  All Other
    Name and Principal Position       Salary   Bonus  Options (#)  Compensation
    ---------------------------      -------- ------- ------------ ------------
<S>                                  <C>      <C>     <C>          <C>
Mark A. Floyd....................... $178,127 $20,000   350,000      $16,667(1)
 President and Chief Executive
 Officer

David B. Stefan.....................   93,391  37,500   125,000       23,140(2)
 Vice President of Sales

Patricia W. Hosek...................  107,625  21,313    50,000           --
 Vice President of Engineering

Gregory L. Langdon..................  103,290  21,051    50,000           --
 Vice President of Marketing

Paul E. Couturier...................   85,399  48,739    37,500       28,332(3)
 Vice President of International
 Operations
</TABLE>

- --------
(1) Represents amount paid in lieu of accrued sabbatical benefit.
(2) Represents a moving allowance.
(3) Represents an annual car and vacation allowance.

                                       53
<PAGE>

   Option Grants During Last Fiscal Year. The following table sets forth
certain information with respect to stock options granted to each of the named
executive officers in fiscal 1998, including the potential realizable value
over the ten-year term of the options, based on assumed, annually compounded
rates of stock value appreciation. These assumed rates of appreciation comply
with the rules of the Securities and Exchange Commission and do not represent
our estimate of future stock price. Actual gains, if any, on stock option
exercises will be dependent on the future performance of our common stock.

   In fiscal 1998, we granted options to purchase up to an aggregate of
1,631,000 shares to employees, directors and consultants. All options were
granted at exercise prices which the board of directors believed to be equal to
the fair market value of our common stock on the date of grant. All options
have a term of ten years. Optionees may pay the exercise price by cash, check
or delivery of already-owned shares of our common stock. All option shares vest
over four years, with 25% of the option shares vesting one year after the
option grant date and the remaining option shares vesting ratably on a monthly
basis over the succeeding 36 months.
<TABLE>
<CAPTION>
                                                                                   Potential Realizable
                                                                                     Value at Assumed
                                                                                  Annual Rates of Stock
                                                                                  Price Appreciation for
                                     Individual Grants                                 Option Term
                         -----------------------------------------            ------------------------------
                                    Percent of
                                       Total              Market
                         Number of    Options              Value
                         Securities Granted to              at
                         Underlying  Employees             Date
                          Options     In Last   Exercise    of     Expiration
          Name            Granted   Fiscal Year  Price   Grant (1)    Date     0%(1)       5%        10%
          ----           ---------- ----------- -------- --------- ---------- -------- ---------- ----------
<S>                      <C>        <C>         <C>      <C>       <C>        <C>      <C>        <C>
Mark A. Floyd...........  350,000      21.46%    $0.60     $2.63     2/16/08  $710,500 $1,289,398 $2,177,540
David B. Stefan.........   75,000       4.60      0.50      2.30    11/17/07   135,000    243,484    409,921
                           50,000       3.07      0.60      2.63     3/11/08   101,500    184,200    311,077
Patricia W. Hosek.......   50,000       3.07      0.60      2.63     3/11/08   101,500    184,200    311,077
Gregory L. Langdon......   50,000       3.07      0.60      2.63     3/11/08   101,500    184,200    311,077
Paul E. Couturier.......   37,500       2.30      0.50      2.30    11/17/07    67,500    121,742    204,960
</TABLE>

- --------
(1) Based upon a subsequent review of the fair value of our common stock at the
    option grant dates, we determined the value of the common stock to be as
    reflected in the "Market Value at Date of Grant" column. The amount shown
    in the "0%" column reflects the difference between the exercise price and
    the deemed fair market vaue as of the date of option grant.
   Aggregate Option Exercises During the Last Fiscal Year and Fiscal Year-End
Option Values.  The following table sets forth information with respect to the
named executive officers concerning their option exercises in fiscal 1998, and
exercisable and unexercisable options held as of June 30, 1998. The "Value of
Unexercised In-the-Money Options at June 30, 1998" is based on a value of $2.63
per share, the fair market value of our common stock as of June 30, 1998 as
determined in a subsequent review of fair market values, less the per share
exercise price, multiplied by the number of shares issuable upon exercise of
the options.

<TABLE>
<CAPTION>
                                                Number of Securities
                                               Underlying Unexercised     Value of Unexercised
                                                  Options at Fiscal      In-the-Money Options at
                           Shares                     Year-End               Fiscal Year-End
                          Acquired    Value   ------------------------- -------------------------
          Name           on Exercise Realized Exercisable Unexercisable Exercisable Unexercisable
          ----           ----------- -------- ----------- ------------- ----------- -------------
<S>                      <C>         <C>      <C>         <C>           <C>         <C>
Mark A. Floyd...........      --         --     93,750       506,250     $223,125    $1,082,375
David B. Stefan.........      --         --        --        125,000          --        261,250
Patricia W. Hosek.......   32,292    $80,084    18,750        98,958       44,625       219,791
Gregory L. Langdon......      --         --     44,791       105,209      109,311       235,189
Paul E. Couturier.......      --         --     49,375        63,125      121,513       141,863
</TABLE>

   The value realized by Ms. Hosek upon the exercise of her options represents
the aggregate amount of the difference between $2.63 per share, the deemed fair
market value of the common stock on the date the option was exercised, and the
$0.15 exercise price of such options.

                                       54
<PAGE>

Benefit Plans

1999 Stock Plan

   Our 1999 stock plan provides for the granting to employees of incentive
stock options within the meaning of Section 422 of the Internal Revenue Code of
1986, as amended, and for the granting to employees and consultants of
nonstatutory stock options and stock purchase rights. The stock plan was
approved by the board of directors in April 1999 and by our stockholders in May
1999. Unless terminated sooner, the stock plan will terminate automatically in
2009. A total of 3,500,000 shares of our common stock is reserved for issuance,
plus annual increases equal to the lesser of:

  . 1,000,000 shares;

  . 3% of the outstanding shares on such date; or

  . a lesser amount determined by the board of directors.

   The stock plan may be administered by the board of directors or a committee
of the board. The board or a committee of the board will have the power to
determine the terms of the options granted, including the exercise price, the
number of shares subject to each option, the vesting provisions, the
exercisability thereof and the form of consideration payable upon such
exercise.

   The stock plan provides that in the event of a merger of Efficient with or
into another corporation, or the sale of substantially all of our assets, each
outstanding option or stock purchase right will be assumed or substituted for
by the successor corporation. In addition, if the options are not substituted
for in the merger, each outstanding option will vest and become exercisable as
to all unvested shares and each stock purchase right shall lapse as to all the
shares for a period of 15 days after receipt of notice from Efficient.

1999 Employee Stock Purchase Plan

   Our 1999 employee stock purchase plan was adopted by our board of directors
in April 1999 and by our stockholders in May 1999. A total of 200,000 shares of
common stock has been reserved for issuance under the purchase plan, plus
annual increases equal to the lesser of:

  . 100,000 shares;

  . 1% of the outstanding shares on such date; or

  . a lesser amount determined by the board on the first day of each fiscal
    year.

   The purchase plan, which is intended to qualify under Section 423 of the
Internal Revenue Code of 1986, as amended, contains successive six-month
offering periods. The offering periods generally start on the first trading day
on or after June 1 and December 1 of each year, except for the first such
offering period which commences on the first trading day on or after the
effective date of this offering and ends on the last trading day on or before
November 30.

   Our employees are eligible to participate if they are employed by us or any
of our participating subsidiaries for at least 20 hours per week and more than
five months in any calendar year. However, the following employees may not
purchase stock under the purchase plan:

  . any employee who immediately after grant owns stock possessing 5% or more
    of the total combined voting power or value of all classes of our capital
    stock; or

  . any employee whose rights to purchase stock under any of our employee
    stock purchase plans accrue at a rate that exceeds $25,000 worth of stock
    for each calendar year.

   Participants may purchase common stock through payroll deductions of up to
10% of the participant's compensation. The maximum number of shares a
participant may purchase during a single offering period is 500 shares.

   Amounts deducted and accumulated by the participant will be used to purchase
shares of common stock at the end of each offering period. The price of stock
purchased under the purchase plan is 85% of the lower of the fair market value
of the common stock at the beginning of the offering period and at the end of
each offering period.

                                       55
<PAGE>

   The purchase plan provides that, in the event of a merger of Efficient with
or into another corporation or a sale of substantially all of our assets,
outstanding options may be assumed or substituted for by the successor
corporation. If the successor corporation refuses to assume or substitute for
the outstanding options, the offering period then in progress will be shortened
and a new exercise date will be set, which will occur before the proposed sale
or merger.

   The purchase plan will terminate in 2009. The board of directors has the
authority to amend or terminate the purchase plan, except that no such action
may adversely affect any outstanding rights to purchase stock.

401(k) Plan

   We maintain a tax-qualified employee savings and retirement plan, a 401(k)
plan, that covers all of our eligible employees. Pursuant to the 401(k) plan,
participants may elect to reduce their current compensation, on a pre-tax
basis, up to 15% or the statutorily prescribed annual limit, whichever is
lower, and have the amount of such reduction contributed to the 401(k) plan.
Participants' salary reduction contributions are fully vested at all times.
Efficient, in its sole discretion, may make additional employer contributions
to the 401(k) plan. Participants' interests in their additional employer
contributions, if any, vest in accordance with a four-year graduated vesting
schedule. To date, Efficient has not made any employer contributions.
Participants generally are eligible for a distribution from the 401(k) plan
upon their reaching age 59 1/2, age 65, death, disability or separation from
service with Efficient. The 401(k) plan is intended to qualify under Section
401(a) of the Internal Revenue Code of 1986, as amended, and its accompanying
trust is intended to be a tax-exempt trust under Section 501(a) of the Internal
Revenue Code of 1986, as amended. Contributions made on behalf of participants,
on a pre-tax basis, to the 401(k) plan, and income earned on such
contributions, are not currently taxable to participants. All such
contributions are tax deductible by Efficient.

Limitations on Directors' Liability and Indemnification

   Our certificate of incorporation limits the liability of our directors to
the maximum extent permitted by Delaware law. Delaware law provides that
directors of a corporation will not be personally liable for monetary damages
for breach of their fiduciary duties as directors, except liability for any of
the following:

  . any breach of their duty of loyalty to the corporation or its
    stockholders;

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

  . unlawful payments of dividends or unlawful stock repurchases or
    redemptions; or

  . any transaction from which the director derived an improper personal
    benefit.

   This limitation of liability does not apply to liabilities arising under the
federal securities laws and does not affect the availability of equitable
remedies such as injunctive relief or rescission.

   Our certificate of incorporation and bylaws provide that we will indemnify
our directors and executive officers, and that we may indemnify our other
officers and employees and other agents, to the fullest extent permitted by
law. We believe that indemnification under our bylaws covers at least
negligence and gross negligence on the part of indemnified parties. Our bylaws
also permit us to secure insurance on behalf of any officer, director, employee
or other agent for any liability arising out of his or her actions in such
capacity, regardless of whether the bylaws would permit indemnification.

   We have entered into agreements to indemnify our directors and executive
officers, in addition to indemnification provided for in our bylaws. These
agreements, among other things, provide for indemnification of our directors
and executive officers for expenses, judgments, fines and settlement amounts
incurred by any such person in any action or proceeding arising out of such
person's services as a director or executive officer of Efficient or at our
request. We believe that these provisions and agreements are necessary to
attract and retain qualified persons as directors and executive officers. We
also 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 Efficient 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 indemnity by these individuals.

                                       56
<PAGE>

                              CERTAIN TRANSACTIONS

   The following is a description of transactions during our last three fiscal
years to which we have been a party, in which the amount involved in the
transaction exceeds $60,000 and in which any director, executive officer or
holder of more than 5% of our capital stock had or will have a direct or
indirect material interest other than compensation arrangements that are
otherwise required to be described under "Management."

   During the past three fiscal years, we have issued redeemable convertible
preferred stock, subordinated promissory notes and warrants as follows:

 .  In September 1995, we sold 2,473,644 shares of Series D preferred stock in a
   private placement at a purchase price of $2.02 per share;

 .  In December 1996, we sold 3,091,430 shares of Series E preferred stock in a
   private placement at a purchase price of $2.42 per share;

 .  In February 1998, we sold 2,057,159 shares of Series F preferred stock in a
   private placement at a purchase price of $2.92 per share;

 .  In June 1998, we sold 1,866,800 shares of Series G preferred stock in a
   private placement at a purchase price of $2.92 per share;

 .  In January 1999, we issued an aggregate $7.0 million of 10% subordinated
   promissory notes due January 2002, together with warrants to purchase
   2,397,260 shares of Series H preferred stock in a private placement at an
   exercise price of $2.92 per share;

 .  In March 1999, we sold 1,850,000 shares of Series G preferred stock in a
   private placement at a purchase price of $2.92 per share;

 .  In April 1999, we issued an aggregate $2.0 million of 10% subordinated
   promissory notes due January 2002, together with warrants to purchase
   684,931 shares of Series H preferred stock in a private placement at an
   exercise price of $2.92 per share; and

 .  On June 28, 1999, we issued a $5.0 million convertible promissory note to
   Covad. The note bears interest at the rate of 8% per year, and will be
   payable on the fifth anniversary of issuance. Covad will have the right to
   demand prepayment of 50% of the principal amount of the note at any time
   after the first anniversary and full prepayment at any time after the second
   anniversary of issuance. The note will be convertible at Covad's option into
   shares of Series I preferred stock at any time at a conversion price of
   $10.09 per share of Series I preferred stock. In addition, in the event we
   complete an initial public offering, the note will automatically convert
   into Series I preferred stock at a conversion price equal to the lesser of
   (1) 70% of the initial public offering price per share or (2) $10.09 per
   share. Assuming completion of this offering at an initial public offering
   price of $11.00 per share, the Covad note will convert into 649,350 shares
   of Series I preferred stock, and those shares will automatically convert
   into an equal number of shares of common stock.

   Our officers, directors and 5% stockholders participated in the foregoing
transactions as follows:

<TABLE>
<CAPTION>
                                                                  Principal
                          Number of Number of Number of Number of   Amount   Number of
                          Shares of Shares of Shares of Shares of   of 10%   Series H
   Name Of Purchaser      Series D  Series E  Series F  Series G    Notes    Warrants
   -----------------      --------- --------- --------- --------- ---------- ---------
<S>                       <C>       <C>       <C>       <C>       <C>        <C>
Texas Instruments
 Incorporated...........  2,473,644       --  1,712,329       --         --        --
ADC Telecommunications..        --  2,066,420    45,881       --         --        --
Enterprise Partners.....        --    265,836    81,773       --         --        --
Crosspoint Venture
 Partners...............        --    236,880    72,848       --  $5,000,000 1,712,329
El Dorado Ventures......        --    236,367    72,689       --  $2,000,000   684,931
Menlo Ventures..........        --    144,322    44,381       --         --        --
Siemens.................        --        --        --  3,716,800        --        --
Palomar Ventures........        --        --        --        --  $2,000,000   684,931
</TABLE>

                                       57
<PAGE>

   Mr. Martin, a member of our board of directors, is affiliated with ADC
Telecommunications. Mr. Hoff, a member of our board of directors, is affiliated
with Crosspoint Venture Partners. Mr. Peterson, a member of our board of
directors, is affiliated with El Dorado Ventures. Mr. Maher, a member of our
board of directors, is affiliated with Siemens. Mr. Gauer, a member of our
board of directors, was formerly affiliated with Enterprise Partners and is
presently affiliated with Palomar Ventures.

Note Repayment and Warrant Exercise Agreement

   Each holder of a 10% subordinated promissory note has entered into a note
repayment and warrant exercise agreement with Efficient. Pursuant to the terms
of the agreement, immediately prior to the closing of this offering, the
aggregate $9.0 million principal amount of the notes will be applied toward the
aggregate exercise price of the warrants to purchase 3,082,191 shares of
Series H preferred stock at an exercise price of $2.92 per share.

ADC Telecommunications, Inc., December 1996

   In December 1996, Efficient entered into a seven-year strategic alliance
agreement with ADC. The agreement provides for joint development and promotion
of products incorporating ADC's and Efficient's technology.

Texas Instruments Incorporated, November 1997

   In November 1997, Efficient and Texas Instruments Incorporated entered into
an agreement to develop a DSL network interface card and associated software.
In February 1998, Efficient and Texas Instruments amended the agreement to
provide that Efficient would focus a percentage of our resources on products,
product developments and marketing programs that support Texas Instruments ADSL
integrated circuits. In March 1999, Efficient and Texas Instruments amended the
agreement to provide Texas Instruments with the right to make and license a
certain Efficient ASIC.

Siemens AG, June 1998

   In June 1998, Efficient entered into an original equipment manufacturer
purchase agreement with Siemens. The agreement provides for the purchase by
Siemens of our SpeedStream 3010 and 3040 models, including supporting software
and hardware and software design, customization and support services.

Director Option and Loan

   In May 1999, Efficient granted Robert Hawk an option to purchase 150,000
shares of common stock at an exercise price of $10.50 per share. In connection
with this option, Efficient loaned Mr. Hawk $1,575,000 with which to exercise
the option. The loan bears interest at the rate of 6.0% per year, and is due
and payable upon demand but not later than June 30, 1999.

Covad Communications Convertible Note Transaction

   On June 28, 1999, we issued a $5.0 million convertible promissory note to
Covad Communications as described above. Mr. Hawk, who has been nominated to
join our board of directors, also serves on the board of directors of Covad
Communications.

                                       58
<PAGE>

                             PRINCIPAL STOCKHOLDERS

   The table on the following page sets forth information regarding the
beneficial ownership of our common stock as of May 31, 1999, by (a) each person
or entity who is known by us to own beneficially more than 5% of our
outstanding stock; (b) each of our directors and a director nominee; (c) each
of the named executive officers; and (d) all directors and executive officers
as a group.
<TABLE>
<CAPTION>
                                               Percentage of      Percentage of
                                                   Shares             Shares
                           Number of Shares  Beneficially Owned Beneficially Owned
Name and Address          Beneficially Owned Prior to Offering  After the Offering
- ----------------          ------------------ ------------------ ------------------
<S>                       <C>                <C>                <C>
Crosspoint Venture
 Partners(1)............       5,116,619            16.0%              14.2%
18552 MacArthur Blvd.,
 Suite 400
Irvine, CA 92612

Texas Instruments
 Incorporated...........       4,185,973            13.1               11.6
P.O. Box 660199, M.S.
 8650
Dallas, TX 75266-0199

El Dorado Ventures(2)...       4,081,800            12.7               11.3
2400 Sand Hill Road,
 Suite 100
Menlo Park, CA 94025

Enterprise Partners(3)..       3,821,374            11.9               10.6
5000 Birch Street, Suite
 6200
Newport Beach, CA 92600

Siemens AG..............       3,716,800            11.6               10.3
Hofmannstrasse 51
81359 Munchen, Germany

ADC Telecommunications,
 Inc....................       2,144,113             6.7                5.9
2240 Campbell Creek Road
Richardson, TX 75082

Menlo Ventures(4).......       2,043,210             6.4                5.7
3000 Sand Hill Road,
 Bldg. 4, Suite 100
Menlo Park, CA 94025

Chase Bailey............       1,650,000             5.1                4.6
258 Main Street #D
Los Gatos, CA 95030

Mark A. Floyd(5)........       1,460,417             4.5                4.0
Bruce W. Brown(6).......          75,000               *                  *
Robert A. Hoff(7).......       5,129,119            16.0               14.2
Thomas H. Peterson(8)...       4,094,300            12.8               11.3
James P. Gauer(9).......       1,971,234             6.1                5.5
Anthony T. Maher(10)....       3,720,550            11.6               10.3
William L. Martin
 III(11)................       2,156,613             6.7                6.0
Robert Hawk(12).........         150,000               *                  *
David B. Stefan(13).....          50,521               *                  *
Patricia W. Hosek(14)...          97,917               *                  *
Gregory L. Langdon(15)..          91,667               *                  *
Paul E. Couturier(16)...          81,823               *                  *
All directors and
 officers as a group (12
 persons)(17)...........      19,181,869            58.6%              52.2%
</TABLE>
- --------

                                       59
<PAGE>

   Applicable percentage ownership in the above table is based on 31,994,808
shares of common stock outstanding as of April 30, 1999, as adjusted to
reflect:

  .  the conversion of $9.0 million in debt into an aggregate of 3,082,191
     shares of preferred stock through the exercise of certain outstanding
     warrants;

  .  167,746 shares of redeemable convertible preferred stock issuable upon
     the exercise of certain outstanding warrants;

  .  the issuance of 105,893 shares of common stock pursuant to the exercise
     of options between March 31, 1999 and April 30, 1999; and

  .  the conversion of all outstanding shares of preferred stock into common
     stock upon the closing of this offering.

   Unless otherwise indicated above, each stockholder named in the table has
sole voting and investment power with respect to all shares shown as
beneficially owned by them, subject to community property laws where
applicable. Unless otherwise indicated, the address for each stockholder listed
in the following table is c/o Efficient Networks, Inc., 4201 Spring Valley
Road, Suite 1200, Dallas, Texas 75244.

  * Less than 1% of the outstanding shares of common stock.
 (1) Represents 3,301,480 shares held by Crosspoint Venture Partners III,
     102,810 shares held by Crosspoint 1993 Entrepreneurs Fund and a warrant
     held by Crosspoint Ventures LS 1997 L.P. for the purchase of 1,712,329
     shares of Series H preferred stock exercisable prior to the consummation
     of this offering.
 (2) Represents 3,236,226 shares held by El Dorado Ventures III, 59,936 shares
     held by El Dorado C&L Fund, L.P., 100,707 shares held by El Dorado
     Technology IV, L.P., a warrant held by El Dorado Ventures IV, L.P. for the
     purchase of 632,626 shares of Series H preferred stock and a warrant held
     by El Dorado Technology '98, L.P. for the purchase of 52,305 shares of
     Series H preferred stock, each exercisable prior to the consummation of
     this offering.
 (3) Represents 3,502,945 shares held by Enterprise Partners II, L.P., and
     318,429 shares held by Enterprise Partners Associates, L.P.
 (4) Represents 2,013,011 shares held by Menlo Ventures VI, L.P. and 30,199
     shares held by Menlo Entrepreneurs Fund VI, L.P.
 (5) Includes 360,417 shares issuable upon exercise of stock options
     exercisable within 60 days of June 30, 1999.

 (6) Includes 75,000 shares issuable upon exercise of stock options exercisable
     within 60 days of June 30, 1999.
 (7) Mr. Hoff is a general partner of Crosspoint Venture Partners. The shares
     listed represent (a) 5,116,619 shares held by Crosspoint Venture Partners
     and (b) 12,500 shares held by Mr. Hoff issuable upon exercise of stock
     options within 60 days of June 30, 1999. Mr. Hoff disclaims beneficial
     ownership of the shares held by Crosspoint Venture Partners, except to the
     extent of his pecuniary interest therein.
 (8) Mr. Peterson is a general partner of El Dorado Ventures. The shares listed
     represent (a) 4,081,800 shares held by El Dorado Ventures and (b) 12,500
     shares held by Mr. Peterson issuable upon exercise of stock options within
     60 days of June 30, 1999. Mr. Peterson disclaims beneficial ownership of
     the shares held by El Dorado Ventures, except to the extent of his
     pecuniary interest therein.
 (9) Mr. Gauer is a general partner of Palomar Ventures and Ocean Park
     Ventures, L.P. The shares listed represent (a) a warrant held by Palomar
     Ventures for the purchase of 684,931 shares of Series H preferred stock
     exercisable prior to the consummation of this offering, (b) 1,273,803
     shares held by Ocean Park Ventures and (c) 12,500 shares held by Mr. Gauer
     issuable upon exercise of stock options within 60 days of June 30, 1999.
     Mr. Gauer disclaims beneficial ownership of the shares held by Palomar
     Ventures and Ocean Park Ventures, except to the extent of his pecuniary
     interest therein.
(10) Includes 3,716,800 shares beneficially owned by Siemens AG. Mr. Maher is a
     member of the board of Siemens AG Information and Communication Networks.
     Mr. Maher disclaims beneficial ownership of the shares held by Siemens.

                                       60
<PAGE>

(11) Includes 2,144,113 shares beneficially owned by ADC Telecommunications,
     Inc. Mr. Martin is a Senior Vice President of ADC Telecommunications, Inc.
     and President of the Business Broadband Group of ADC Telecommunications,
     Inc. The shares listed represent 12,500 shares held by Mr. Martin issuable
     upon exercise of stock options within 60 days of June 30, 1999. Mr. Martin
     disclaims beneficial ownership of the shares held by ADC
     Telecommunications, Inc.
(12) Includes 150,000 shares issued upon exercise of a stock option. All of
     such shares are currently subject to a right of repurchase by Efficient.
(13) Includes 50,521 shares issuable upon exercise of stock options exercisable
     within 60 days of June 30, 1999.
(14) Includes 65,625 shares issuable upon exercise of stock options exercisable
     within 60 days of June 30, 1999.
(15) Includes 91,667 shares issuable upon exercise of stock options exercisable
     within 60 days of June 30, 1999.
(16) Includes 81,823 shares issuable upon exercise of stock options exercisable
     within 60 days of June 30, 1999.
(17) Includes an aggregate of 853,304 shares issuable upon exercise of stock
     options exercisable within 60 days of June 30, 1999.

                                       61
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

General

   Upon the completion of this offering, we will be authorized to issue
200,000,000 shares of common stock, $0.001 par value, and 10,000,000 shares of
undesignated preferred stock, $0.001 par value. The following description of
our capital stock is subject to and qualified in its entirety by our
certificate of incorporation and bylaws, which are included as exhibits to the
registration statement of which this prospectus forms a part, and by the
provisions of applicable Delaware law.

Common Stock

   As of May 31, 1999, there were 32,067,124 shares of common stock outstanding
after giving pro forma effect to (1) the conversion of $9.0 million in debt of
Efficient into an aggregate of 3,082,191 shares of redeemable convertible
preferred stock, and (2) the conversion of all outstanding shares of redeemable
convertible preferred stock into common stock upon the closing of this
offering. These shares were held of record by approximately 60 stockholders
including 24,720,213 shares of common stock to be issued upon the closing of
this offering upon conversion of all outstanding shares of redeemable
convertible preferred stock.

   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 such dividends, if any, as may be declared from
time to time by the board of directors out of funds legally available for that
purpose. See "Dividend Policy." In the event of a liquidation, dissolution or
winding up of Efficient, the holders of common stock are entitled to share
ratably in all assets remaining after payment of liabilities, subject to prior
distribution rights of preferred stock, if any, then outstanding. The holders
of common stock have no preemptive or conversion rights or other subscription
rights. There are no redemption or sinking fund provisions applicable to the
common stock. Wilson Sonsini Goodrich & Rosati, Professional Corporation,
counsel to Efficient, shall opine that the shares of common stock to be issued
upon the closing of this offering, when issued and sold in the manner described
in this prospectus and in accordance with the resolutions adopted by the board
of directors, will be fully paid and nonassessable.

Preferred Stock

   The board of directors has the authority, without action by the
stockholders, to designate and issue preferred stock in one or more series and
to designate the rights, preferences and privileges of each series, which may
be greater than the rights of the common stock. It is not possible to state the
actual effect of the issuance of any shares of preferred stock upon the rights
of holders of the common stock until the board of directors determines the
specific rights of the holders of such preferred stock. However, the effects
might include, among other things:

  . restricting dividends on the common stock;

  . diluting the voting power of the common stock;

  . impairing the liquidation rights of the common stock; or

  . delaying or preventing a change in control of Efficient without further
    action by the stockholders.

   Upon the closing of this offering no shares of preferred stock will be
outstanding, and we have no present plans to issue any shares of preferred
stock.

Warrants

   At March 31, 1999, there were warrants outstanding to purchase 96,000 shares
of Series A preferred stock, 37,500 shares of Series C preferred stock and
34,246 shares of Series G preferred stock. Upon completion of

                                       62
<PAGE>

this offering, these warrants will become exercisable to purchase an aggregate
of 167,746 shares of common stock. These numbers exclude warrants to purchase
3,082,191 shares of Series H preferred stock. It is anticipated that the Series
H warrants will be exercised prior to completion of this offering and will
convert into 3,082,191 shares of common stock upon completion of this offering.

Registration Rights

   The holders of 24,720,213 shares of redeemable convertible preferred stock,
and the holders of warrants to purchase 3,082,191 shares of redeemable
convertible preferred stock are entitled to certain rights with respect to the
registration of shares of common stock that are issuable upon the conversion of
such preferred stock under the Securities Act. Certain of these rights are
provided under the terms of an agreement between Efficient and the holders of
the registrable securities. Beginning 180 days following the date of this
prospectus, holders of at least 50% of the then outstanding registrable
securities may require on up to two occasions that we register their shares for
public resale. Also, holders of registrable securities may require on one
occasion within any twelve month period that we register their shares for
public resale on Form S-3 or similar short-form registration if the value of
the securities to be registered is at least $1.0 million. We may defer a
registration on Form S-3 for 60 days in view of market conditions. Furthermore,
in the event we elect to register any of our shares of common stock for
purposes of effecting any public offering, the holders of registrable
securities are entitled to include their shares of common stock in the
registration, but we may reduce the number of shares proposed to be registered
in view of market conditions. These registration rights have been waived with
respect to this offering. All expenses incurred in connection with any
registration, other than underwriting discounts and commissions attributable to
registrable securities, will be borne by us. All registration rights will
terminate six years following the consummation of this offering, or, with
respect to each holder of registrable securities, at such time as the holder is
entitled to sell all of its shares in any three-month period under Rule 144(k)
of the Securities Act.

   The holder of a warrant to purchase 96,000 shares of preferred stock
convertible into 96,000 shares of common stock is also entitled to certain
rights with respect to registration of such shares under the Securities Act.
Beginning 180 days following the date of this prospectus, the holder may
require us to register the holder's shares for public resale on Form S-3 or
similar short-form registration; however, we may defer such registration for 90
days in view of market conditions. In addition to Form S-3 registration rights,
the holder also has rights to include its shares in any registration of our
shares of common stock for purposes of effecting a public offering, but we may
reduce the number of shares proposed to registered in view of market condition.
These registration rights have been waived with respect to this offering.

Delaware Anti-Takeover Law and Certain Charter and Bylaw Provisions

   Certain provisions of Delaware law and our certificate of incorporation and
bylaws could make the following transactions more difficult:

  . the acquisition of Efficient by means of a tender offer;

  . the acquisition of Efficient by means of a proxy contest or otherwise; or

  . the removal of our incumbent officers and directors.

   These provisions, summarized below, are expected to discourage certain types
of coercive takeover practices and inadequate takeover bids. These provisions
are also designed to encourage persons seeking to acquire control of Efficient
to first negotiate with our board of directors. We believe that the benefits of
our increased ability to negotiate with the proponent of an unfriendly or
unsolicited proposal to acquire or restructure Efficient outweigh the
disadvantages of discouraging such proposals as negotiation of such proposals
could result in an improvement of their terms.

   Election and Removal of Directors. Our board of directors is divided into
three classes. The directors in each class will serve for a three-year term,
one class being elected each year by our stockholders. See

                                       63
<PAGE>

"Management--Executive Officers and Directors." This system of electing and
removing directors may tend to discourage a third party from making a tender
offer or otherwise attempting to obtain control of Efficient because it
generally makes it more difficult for stockholders to replace a majority of the
directors.

   Stockholder Meetings. Under our bylaws, only our board of directors,
Chairman of the Board and President may call special meetings of stockholders.

   Requirements for Advance Notification of Stockholder Nominations and
Proposals. Our bylaws establish advance notice procedures with respect to
stockholder proposals and the nomination of candidates for election as
directors, other than nominations made by or at the direction of the board of
directors or a committee of the board.

   Delaware Anti-Takeover Law. We are subject to Section 203 of the Delaware
General Corporation Law, an anti-takeover law. In general, Section 203
prohibits a publicly held Delaware corporation from engaging in a "business
combination" with an "interested stockholder" for a period of three years
following the date the person became an interested stockholder, unless 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 interested stockholder.
Generally, an "interested stockholder" is a person who, together with
affiliates and associates, owns or within three years prior to the
determination of interested stockholder status, did own, 15% or more of a
corporation's voting stock. The existence of this provision may have an anti-
takeover effect with respect to transactions not approved in advance by our
board of directors, including discouraging attempts that might result in a
premium over the market price for the shares of common stock held by
stockholders.

   Elimination of Stockholder Action By Written Consent. Our certificate of
incorporation eliminates the right of stockholders to act by written consent
without a meeting.

   Elimination of Cumulative Voting. Our certificate of incorporation and
bylaws do not provide for cumulative voting in the election of directors.

   Undesignated Preferred Stock. The authorization of undesignated preferred
stock makes it possible for the board of directors to issue preferred stock
with voting or other rights or preferences that could impede the success of any
attempt to change control of Efficient. These and other provisions may have the
effect of deterring hostile takeovers or delaying changes in control or
management of Efficient.

   Amendment of Charter Provisions. The amendment of any of the above
provisions would require approval by holders of at least 66 2/3% of the
outstanding common stock.

Transfer Agent and Registrar

   The transfer agent and registrar for the common stock is Harris Trust
Company of California.

Nasdaq National Market Listing

   Our shares have been approved for listing on The Nasdaq National Market
under the symbol "EFNT."

                                       64
<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

   Prior to this offering, there has been no public market for our common
stock, and there can be no assurance that a significant public market for the
common stock will develop or be sustained after this offering. Future sales of
substantial amounts of common stock, including shares issued upon exercise of
outstanding options and warrants, in the public market following this offering
could adversely affect market prices prevailing from time to time and could
impair our ability to raise capital through the sale of our equity securities.
Sales of substantial amounts of our common stock in the public market after the
restrictions lapse could adversely affect the prevailing market price and our
ability to raise equity capital in the future.

   Upon completion of this offering and based on shares outstanding at May 31,
1999, we will have outstanding 36,067,124 shares of common stock. Of these
shares, all the shares sold in this offering, plus any shares issued upon
exercise of the underwriters' over-allotment option, will be freely tradable
without restriction under the Securities Act, unless purchased by our
"affiliates" as that term is defined in Rule 144 under the Securities Act.

   The remaining 32,067,124 shares of common stock outstanding are "restricted
securities" within the meaning of Rule 144 under the Securities Act. Restricted
securities may be sold in the public market only if registered or if they
qualify for an exemption from registration under Rules 144, 144(k) or 701
promulgated under the Securities Act, which are summarized below.

   Our directors, officers and stockholders have entered into lock-up
agreements with the underwriters of this offering generally providing that they
will not offer, sell, contract to sell or grant any option to purchase or
otherwise dispose of our shares of common stock or any securities exercisable
for or convertible into our common stock owned by them prior to this offering
for a period of 180 days after the effective date of the registration statement
filed pursuant to this offering without the prior written consent of Credit
Suisse First Boston Corporation. As a result of these contractual restrictions,
notwithstanding possible earlier eligibility for sale under the provisions of
Rules 144, 144(k) and 701, shares subject to lock-up agreements may not be sold
until such agreements expire or are waived by Credit Suisse First Boston
Corporation. Taking into account the lock-up agreements, and assuming Credit
Suisse First Boston Corporation does not release stockholders from these
agreements prior to the expiration of the 180 day lock-up period, the following
shares will be eligible for sale in the public market at the following times:

  . beginning on the effective date of the registration statement, the
    4,000,000 shares sold in this offering, and 76,250 additional shares,
    will be immediately available for sale in the public market;

  . beginning 90 days after the effective date, 140,938 additional shares
    will be available for sale in the public market;

  . after 180 days following the date of this prospectus, 26,559,412
    additional shares will become eligible for sale under Rule 144 subject to
    volume restrictions as described below; and

  . the remainder of the restricted securities will be eligible for sale from
    time to time thereafter, subject in some cases to compliance with Rule
    144.

   In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this prospectus, a person who has beneficially owned restricted
shares for at least one year, including the holding period of any prior owner
except an affiliate, would be entitled to sell within any three-month period a
number of shares that does not exceed the greater of:

  . 1% of the number of shares of common stock then outstanding, which will
    equal approximately 360,000 shares immediately after this offering; or

  . the average weekly trading volume of our common stock during the four
    calendar weeks preceding the filing of a Form 144 with respect to such
    sale.

   Sales under Rule 144 are also subject to certain manner of sale provisions
and notice requirements and to the availability of current public information
about Efficient. Under Rule 144(k), a person who is not deemed to

                                       65
<PAGE>

have been an affiliate of Efficient at any time during the three months
preceding a sale, and who has beneficially owned the shares proposed to be sold
for at least two years, including the holding period of any prior owner except
an affiliate, is entitled to sell such shares without complying with the manner
of sale, public information, volume limitation or notice provisions of Rule
144.

   Rule 701, as currently in effect, permits resales of shares in reliance upon
Rule 144 but without compliance with certain restrictions, including the
holding period requirement, of Rule 144. Any of our employees, officers,
directors, or consultant who purchased shares under a written compensatory plan
or contract may be entitled to rely on the resale provisions of Rule 701. Rule
701 permits affiliates to sell their Rule 701 shares under Rule 144 without
complying with the holding period requirements of Rule 144. Rule 701 further
provides that non-affiliates may sell such shares in reliance on Rule 144
without having to comply with the holding period, public information, volume
limitation or notice provisions of Rule 144. All holders of Rule 701 shares are
required to wait until 90 days after the date of this prospectus before selling
such shares. However, 730,931 Rule 701 shares are subject to lock-up agreements
and will only become eligible for sale at the earlier of the expiration of the
180-day lock-up agreements or no sooner than 90 days after the offering upon
obtaining the prior written consent of Credit Suisse First Boston Corporation.

   Within 90 days following the effectiveness of this offering, we will file a
registration statement on Form S-8 registering 10,170,575 shares of common
stock subject to outstanding options or reserved for future issuance under our
stock plans. As of March 31, 1999, options to purchase a total of 6,470,575
shares were outstanding and 3,700,000 shares were reserved for future issuance
under our stock plans. Upon the filing of the registration statement on Form S-
8, common stock issued upon exercise of outstanding vested options or issued
under our purchase plan, other than common stock issued to our affiliates, will
be available for immediate resale in the open market.

   Also beginning six months after the date of this offering, holders of
27,802,404 restricted shares and certain holders of warrants to purchase 96,000
shares of common stock will be entitled to certain registration rights. See
"Description of Capital Stock--Registration Rights." Registration of such
shares under the Securities Act would result in such shares becoming freely
tradable without restriction under the Securities Act, except for shares
purchased by affiliates, immediately upon the effectiveness of such
registration.

                                       66
<PAGE>

                                  UNDERWRITING

   Under the terms and subject to the conditions contained in an underwriting
agreement dated     , 1999, we have agreed to sell to the underwriters named
below, for whom Credit Suisse First Boston Corporation, BancBoston Robertson
Stephens, Inc. and Volpe Brown Whelan & Company, LLC are acting as
representatives, the following respective numbers of shares of common stock:

<TABLE>
<CAPTION>
                                                                          Number
                                                                            of
                                 Underwriters                             Shares
                                 ------------                             ------
      <S>                                                                 <C>
      Credit Suisse First Boston Corporation.............................
      BancBoston Robertson Stephens, Inc.................................
      Volpe Brown Whelan & Company, LLC..................................
                                                                           ----
        Total............................................................
                                                                           ====
</TABLE>

   The underwriting agreement provides that the underwriters are obligated to
purchase all the shares of common stock in the offering if any are purchased,
other than those shares covered by the over-allotment option described below.
The underwriting agreement also provides that, if an underwriter defaults, the
purchase commitments of non-defaulting underwriters may be increased or the
offering of common stock may be terminated.

   We have granted to the underwriters a 30-day option to purchase on a pro
rata basis up to additional shares at the initial public offering price less
the underwriting discounts and commissions. The option may be exercised only to
cover any over-allotments of common stock.

   The underwriters propose to offer the shares of common stock initially at
the public offering price on the cover page of this prospectus and to selling
group members at that price less a concession of $     per share. The
underwriters and selling group members may allow a discount of $     per share
on sales to other broker/dealers. After the initial public offering, the public
offering price and concession and discount to dealers may be changed by the
representatives.

   The following table summarizes the compensation and estimated expenses we
will pay:

<TABLE>
<CAPTION>
                                                             Total
                                                 -----------------------------
                                            Per     Without          With
                                           Share Over-allotment Over-allotment
                                           ----- -------------- --------------
<S>                                        <C>   <C>            <C>
Underwriting Discounts and Commissions
 paid by us............................... $          $              $
Expenses payable by us.................... $          $              $
</TABLE>

   The underwriters have informed us that they do not expect discretionary
sales to exceed 5% of the shares of common stock being offered.

   We, our officers and directors and other stockholders holding an aggregate
of 31,567,221 shares have agreed that we and they will not offer, sell,
contract to sell, announce our intention to sell, pledge or otherwise dispose
of, directly or indirectly, or file with the Securities and Exchange Commission
a registration statement under the Securities Act relating to, any additional
shares of our common stock or securities convertible into or exchangeable or
exercisable for any of our common stock without the prior written consent of
Credit Suisse First Boston Corporation for a period of 180 days after the date
of this prospectus, except in the case of issuances by Efficient upon the
exercise of employee stock options outstanding on the date hereof.

   The underwriters have reserved for sale, at the initial public offering
price, up to 200,000 shares of the common stock for some of our vendors,
customers and other people and entities with whom we maintain business
relationships who have expressed an interest in purchasing common stock in the
offering. The number of shares available for sale to the general public in the
offering will be reduced to the extent these persons purchase the reserved
shares. Any reserved shares not purchased will be offered by the underwriters
to the general public on the same terms as the other shares.

                                       67
<PAGE>

   We have agreed to indemnify the underwriters against liabilities under the
Securities Act, or contribute to payments which the underwriters may be
required to make in that respect.

   The shares of common stock have been approved for listing on The Nasdaq
National Market under the symbol "EFNT."

   Prior to this offering, there has been no public market for the common
stock. The initial public offering price will be determined by negotiation
between us and the representatives. The principal factors to be considered in
determining the public offering price will include: the information set forth
in this prospectus and otherwise available to the representatives; the history
and the prospects for the industry in which we will compete; the ability of our
management; the prospects for our future earnings; the present state of our
development and our current financial condition; the general condition of the
securities markets at the time of this offering; and the recent market prices
of, and the demand for, publicly-traded common stock of generally comparable
companies.

   The representatives may engage in over-allotment, stabilizing transactions,
syndicate covering transactions and penalty bids in accordance with Regulation
M under the Securities Exchange Act of 1934, as amended. Over-allotment
involves syndicate sales in excess of the offering size, which creates a
syndicate short position. Stabilizing transactions permit bids to purchase the
underlying security so long as the stabilizing bids do not exceed a specified
maximum. Syndicate covering transactions involve purchases of the common stock
in the open market after the distribution has been completed in order to cover
syndicate short positions. Penalty bids permit the representatives to reclaim a
selling concession from a syndicate member when the common stock originally
sold by such syndicate member is purchased in a syndicate covering transaction
to cover syndicate short positions. These stabilizing transactions, syndicate
covering transactions and penalty bids may cause the price of the common stock
to be higher than it would otherwise be in the absence of these transactions.
These transactions may be effected on The Nasdaq National Market or otherwise
and, if commenced, may be discontinued at any time.

                                       68
<PAGE>

                          NOTICE TO CANADIAN RESIDENTS

Resale Restrictions

   The distribution of the common stock in Canada is being made only on a
private placement basis exempt from the requirement that we prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of common stock are effected. Accordingly, any resale of the common
stock in Canada must be made in accordance with applicable securities laws
which will vary depending on the relevant jurisdiction, and which may require
resales to be made in accordance with available statutory exemptions or
pursuant to a discretionary exemption granted by the applicable Canadian
securities regulatory authority. Purchasers are advised to seek legal advice
prior to any resale of the common stock.

Representations of Purchasers

   Each purchaser of common stock in Canada who receives a purchase
confirmation will be deemed to represent to us and the dealer from whom such
purchase confirmation is received that (1) the purchaser is entitled under
applicable provincial securities laws to purchase the common stock without the
benefit of a prospectus qualified under these securities laws, (2) where
required by law, that the purchaser is purchasing as principal and not as
agent, and (3) the purchaser has reviewed the text above under "Resale
Restrictions."

Rights of Action of Ontario Purchasers

   The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
Ontario securities law. As a result, Ontario purchasers must rely on other
remedies that may be available, including common law rights of action for
damages or rescission or rights of action under the civil liability provisions
of the U.S. federal securities laws.

Enforcement of Legal Rights

   All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be
possible for Canadian purchasers to effect service of process within Canada
upon the issuer or these persons. All or a substantial portion of the assets of
the issuer and these persons may be located outside of Canada and, as a result,
it may not be possible to satisfy a judgment against the issuer or these
persons in Canada or to enforce a judgment obtained in Canadian courts against
the issuer or these persons outside of Canada.

Notice to British Columbia Residents

   A purchaser of common stock to whom the Securities Act (British Columbia)
applies is advised that the purchaser is required to file with the British
Columbia Securities Commission a report within ten days of the sale of any
common stock acquired by the purchaser pursuant to this offering. This report
must be in the form attached to British Columbia Securities Commission Blanket
Order BOR #95/17, a copy of which may be obtained from us. Only one report must
be filed in respect of common stock acquired on the same date and under the
same prospectus exemption.

Taxation and Eligibility for Investment

   Canadian purchasers of common stock should consult their own legal and tax
advisors with respect to the tax consequences of an investment in the common
stock in their particular circumstances and with respect to the eligibility of
the common stock for investment by the purchaser under relevant Canadian
legislation.

                                       69
<PAGE>

                                 LEGAL MATTERS

   The validity of the common stock offered hereby will be passed upon for
Efficient by Wilson Sonsini Goodrich & Rosati, Professional Corporation, Palo
Alto, California. The due authorization of the shares to be sold by Efficient
and the execution and delivery of the underwriting agreement for this offering
will be passed upon for the underwriters by Brobeck, Phleger & Harrison LLP,
Austin, Texas.

                                    EXPERTS

   The consolidated financial statements of Efficient Networks, Inc. as of June
30, 1997, June 30, 1998 and March 31, 1999, and for each of the years in the
three-year period ended June 30, 1998 and the nine months ended March 31, 1999,
included in this prospectus and registration statement have been audited by
KPMG LLP, independent auditors, as set forth in their reports, which are
included in this prospectus and registration statement, and are included in
reliance upon their reports given on their authority as experts in accounting
and auditing.

                        ADDITIONAL EFFICIENT INFORMATION

   We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act with respect to the common stock
offered in this offering. This prospectus does not contain all of the
information set forth in the registration statement and the exhibits and
schedules thereto. For further information with respect to Efficient and the
common stock offered in this offering, we refer you to the registration
statement and to the attached exhibits and schedules. With respect to each such
document filed as an exhibit to the registration statement, we refer you to the
exhibit for a more complete description of the matter involved.

   You may inspect our registration statement and the attached exhibits and
schedules without charge at the public reference facilities maintained by the
Securities and Exchange Commission at 450 Fifth Street, N.W., Washington, D.C.
20549, and at the regional offices of the Securities and Exchange Commission
located at Seven World Trade Center, 13th Floor, New York, NY 10048, and the
Northwestern Atrium Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661. Please call the Securities and Exchange Commission at 1-800-
SEC-0330 for further information about public reference rooms. You may obtain
copies of all or any part of our registration statement from the Securities and
Exchange Commission upon payment of prescribed fees. You may also inspect
reports, proxy, and information statements and other information regarding
registrants that file electronically with the Securities and Exchange
Commission without charge at a Web site maintained by the Securities and
Exchange Commission at http://www.sec.gov.

   Upon completion of this offering, Efficient will become subject to the
information and periodic reporting requirements of the Securities Exchange Act
and, accordingly, will file periodic reports, proxy statements and other
information with the Securities and Exchange Commission. Such periodic reports,
proxy statements and other information will be available for inspection and
copying at the Securities and Exchange Commission's public reference rooms, and
the Web site of the Securities and Exchange Commission referred to above.

                                       70
<PAGE>

                            EFFICIENT NETWORKS, INC.

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Independent Auditors' Report............................................... F-2
Consolidated Balance Sheets................................................ F-3
Consolidated Statements of Operations...................................... F-4
Consolidated Statements of Stockholders' Equity (Deficit).................. F-5
Consolidated Statements of Cash Flows...................................... F-6
Notes to Consolidated Financial Statements................................. F-7
</TABLE>

                                      F-1
<PAGE>

                          Independent Auditors' Report

The Board of Directors
Efficient Networks, Inc.:

  We have audited the accompanying consolidated balance sheets of Efficient
Networks, Inc. and subsidiary as of June 30, 1997 and 1998 and March 31, 1999,
and the related consolidated statements of operations, stockholders' equity
(deficit), and cash flows for each of the years in the three-year period ended
June 30, 1998 and for the nine months ended March 31, 1999. These consolidated
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these consolidated 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 consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Efficient
Networks, Inc. and subsidiary as of June 30, 1997 and 1998 and March 31, 1999,
and the results of their operations and their cash flows for each of the years
in the three-year period ended June 30, 1998 and for the nine months ended
March 31, 1999, in conformity with generally accepted accounting principles.

                                             KPMG LLP

Dallas, Texas
April 26, 1999

                                      F-2
<PAGE>

                            EFFICIENT NETWORKS, INC.

                          Consolidated Balance Sheets

                   June 30, 1997 and 1998 and March 31, 1999

                       (in thousands, except share data)

<TABLE>
<CAPTION>
                                                                                  June 30          March 31, 1999
                                                                              -----------------  --------------------
                                                                                                           Pro forma
                                                                                1997     1998    Actual   (unaudited)
                      Assets                                                  --------  -------  -------  -----------
<S>                                                                           <C>       <C>      <C>      <C>
Current assets:.....................................................                                      (note 2(l))
  Cash and cash equivalents.........................................          $  3,413  $ 7,607  $ 4,596  $     6,596
  Accounts receivable, net of allowance
   for doubtful accounts of $25 in 1997,
   $15 in 1998 and $70 in 1999......................................               779      461    6,499        6,499
  Inventories.......................................................               594      898    3,917        3,917
  Other assets......................................................                --      202       48           48
                                                                              --------  -------  -------  -----------
    Total current assets............................................             4,786    9,168   15,060       17,060
Furniture and equipment, net........................................             1,559    1,404    2,130        2,130
Other assets, net...................................................               109       95       44           44
                                                                              --------  -------  -------  -----------
                                                                              $  6,454  $10,667  $17,234  $    19,234
                                                                              ========  =======  =======  ===========
       Liabilities, Redeemable Convertible
Preferred Stock and Stockholders' Equity (Deficit)

Current liabilities:
  Accounts payable..................................................          $    184  $   547  $ 3,995  $     3,995
  Accrued liabilities...............................................               232      751      967          967
  Deferred revenue..................................................                --       --      625          625
                                                                              --------  -------  -------  -----------
    Total current liabilities.......................................               416    1,298    5,587        5,587
Long-term debt, net of discount.....................................                --       --    4,253           --
Other liabilities...................................................                13       --       22           22
                                                                              --------  -------  -------  -----------
    Total liabilities...............................................               429    1,298    9,862        5,609
                                                                              --------  -------  -------  -----------
Redeemable convertible preferred stock
 (note 7)...........................................................            23,635   34,743   40,408           --
Commitments and contingencies
Stockholders' equity (deficit):
  Common stock, par value $.001 per share,
   100,000,000 shares authorized;
   3,054,771, 3,616,964 and 3,918,765
   shares issued and outstanding in 1997,
   1998 and 1999, respectively; pro
   forma--31,721,169 shares issued and
   outstanding......................................................                 3        4        4           32
  Additional paid-in capital........................................             3,717    7,221   24,865       75,689
  Deferred stock option compensation................................            (2,837)  (4,815) (16,046)     (16,046)
  Accumulated deficit...............................................           (18,493) (27,784) (41,859)     (46,050)
                                                                              --------  -------  -------  -----------
    Total stockholders' equity (deficit)............................           (17,610) (25,374) (33,036)      13,625
                                                                              --------  -------  -------  -----------
                                                                              $  6,454  $10,667  $17,234  $    19,234
                                                                              ========  =======  =======  ===========
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-3
<PAGE>

                            EFFICIENT NETWORKS, INC.

                     Consolidated Statements of Operations

 Years ended June 30, 1996, 1997 and 1998, and the nine months ended March 31,
                                 1998 and 1999

                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                                                            Nine months ended
                                                          ---------------------
                                                           March 31,
                                                             1998     March 31,
                                1996     1997     1998    (unaudited)   1999
                              --------  -------  -------  ----------- ---------
<S>                           <C>       <C>      <C>      <C>         <C>
Net revenues................. $  3,687  $ 4,122  $ 3,370    $ 2,703   $  7,139
Cost of revenues.............    2,209    2,386    2,160      1,553      6,699
                              --------  -------  -------    -------   --------
    Gross profit.............    1,478    1,736    1,210      1,150        440
                              --------  -------  -------    -------   --------
Operating expenses:
  Sales and marketing........    2,366    2,409    3,436      2,232      3,856
  Research and development...    3,853    4,183    4,389      2,845      5,546
  General and
   administrative............    1,082    1,245    1,641      1,197      1,234
  Stock option compensation..      198      659    1,165        749      1,899
                              --------  -------  -------    -------   --------
    Total operating
     expenses................    7,499    8,496   10,631      7,023     12,535
                              --------  -------  -------    -------   --------
    Loss from operations.....   (6,021)  (6,760)  (9,421)    (5,873)   (12,095)
Interest expense.............       --       --      (10)        --     (2,130)
Interest income..............      177      144      146         87        154
Other, net...................       --      (19)     (6)        (6)         (4)
                              --------  -------  -------    -------   --------
    Net loss................. $ (5,844) $(6,635) $(9,291)   $(5,792)  $(14,075)
                              ========  =======  =======    =======   ========
    Basic and diluted net
     loss per share of common
     stock................... $  (2.06) $ (2.19) $ (2.86)   $ (1.81)  $  (3.77)
                              ========  =======  =======    =======   ========
    Weighted-average shares
     of common stock
     outstanding.............    2,838    3,027    3,254      3,193      3,807
                              ========  =======  =======    =======   ========
    Unaudited pro forma basic
     and diluted net loss per
     share...................                    $ (0.41)             $  (0.67)
                                                 =======              ========
    Weighted average shares
     used to compute
     unaudited pro forma
     basic and diluted net
     loss per share..........                     22,886                27,077
                                                 =======              ========
</TABLE>


See accompanying notes to consolidated financial statements.

                                      F-4
<PAGE>

                            EFFICIENT NETWORKS, INC.

            Consolidated Statements of Stockholders Equity (Deficit)

 Years ended June 30, 1996, 1997 and 1998, and the nine months ended March 31,
                                      1999

                       (in thousands, except share data)

<TABLE>
<CAPTION>
                                                                                   Total
                           Common Stock    Additional   Deferred               stockholders'
                         -----------------  paid-in   stock option Accumulated    equity
                           Shares   Amount  capital   compensation   deficit     (deficit)
                         ---------- ------ ---------- ------------ ----------- -------------
<S>                      <C>        <C>    <C>        <C>          <C>         <C>
Balance at June 30,
 1995...................  2,811,875  $ 3    $     3     $     --    $ (6,014)     $(6,008)
  Issuance of common
   stock under stock
   option plan..........    180,396   --         11           --          --           11
  Deferred stock option
   compensation.........         --   --      1,425       (1,425)         --           --
  Amortization of
   deferred stock option
   compensation ........         --   --         --          198          --          198
  Net loss..............         --   --         --           --      (5,844)      (5,844)
                         ----------  ---    -------     --------    --------      -------
Balance at June 30,
 1996...................  2,992,271    3      1,439       (1,227)    (11,858)     (11,643)
  Issuance of common
   stock under stock
   option plan..........     62,500   --          9           --          --            9
  Deferred stock option
   compensation.........         --   --      2,269       (2,269)         --           --
  Amortization of
   deferred stock option
   compensation.........         --   --         --          659          --          659
  Net loss..............         --   --         --           --      (6,635)      (6,635)
                         ----------  ---    -------     --------    --------      -------
Balance at June 30,
 1997...................  3,054,771    3      3,717       (2,837)    (18,493)     (17,610)
  Issuance of common
   stock under stock
   option plan..........    448,125    1         61           --          --           62
  Issuance of common
   stock................    114,068   --        300           --          --          300
  Deferred stock option
   compensastion........         --   --      3,143       (3,143)         --           --
  Amortization of
   deferred stock option
   compensation.........         --   --         --        1,165          --        1,165
  Net loss..............         --   --         --           --      (9,291)      (9,291)
                         ----------  ---    -------     --------    --------      -------
Balance at June 30,
 1998...................  3,616,964    4      7,221       (4,815)    (27,784)     (25,374)
  Issuance of common
   stock under stock
   option plan..........    301,801   --         48           --          --           48
  Issuance of warrants..         --   --      4,729           --          --        4,729
  Deferred stock option
   compensation.........         --   --     13,130      (13,130)         --           --
  Amortization of
   deferred stock option
   compensation.........         --   --         --        1,899          --        1,899
  Accretion of issuance
   costs on redeemable
   convertible preferred
   stock................         --   --       (263)          --          --         (263)
  Net loss..............         --   --         --           --     (14,075)     (14,075)
                         ----------  ---    -------     --------    --------      -------
Balance at March 31,
 1999...................  3,918,765    4     24,865      (16,046)    (41,859)     (33,036)
  Unaudited pro forma
   issuance of common
   stock upon conversion
   of redeemable
   convertible preferred
   stock................ 24,720,213   25     40,470           --          --       40,495
  Unaudited pro forma
   accretion of issuance
   costs on redeemable
   convertible preferred
   stock................         --   --        (87)          --          --          (87)
  Unaudited pro forma
   net loss related to
   accretion of
   remaining discount on
   long term debt.......         --   --         --           --      (4,191)      (4,191)
  Unaudited pro forma
   issuance of common
   stock upon exercise
   of warrants..........  3,082,191    3     10,441           --          --       10,444
                         ----------  ---    -------     --------    --------      -------
Unaudited pro forma
 balance at March 31,
 1999................... 31,721,169  $32    $75,689     $(16,046)   $(46,050)     $13,625
                         ==========  ===    =======     ========    ========      =======
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-5
<PAGE>

                            EFFICIENT NETWORKS, INC.

                     Consolidated Statements of Cash Flows

 Years ended June 30, 1996, 1997 and 1998, and the nine months ended March 31,
                                 1998 and 1999

                                 (in thousands)

<TABLE>
<CAPTION>
                                                            Nine months ended
                                                          ---------------------
                                                           March 31,
                                                             1998     March 31,
                                1996     1997     1998    (unaudited)   1999
                               -------  -------  -------  ----------- ---------
<S>                            <C>      <C>      <C>      <C>         <C>
Cash flows from operating
 activities:
 Net loss..................... $(5,844) $(6,635) $(9,291)   $(5,792)  $(14,075)
 Adjustments to reconcile net
  loss to net cash used in
  operating activities:
  Depreciation and
   amortization...............     800      861      727        544        588
  Amortization of deferred
   stock option compensation..     198      659    1,165        749      1,899
  Accretion of discount on
   subordinated promissory
   notes......................      --       --       --         --      1,982
  Changes in operating assets
   and liabilities:
   Accounts receivable........     (84)     (12)     318       (473)    (6,038)
   Inventories................     (76)     443     (304)       (50)    (3,019)
   Other assets and
    liabilities...............      19       59     (201)        74        230
   Accounts payable and
    accrued liabilities.......    (386)     (18)     967        539      3,672
   Deferred revenue...........      --       --       --         --        625
                               -------  -------  -------    -------   --------
    Net cash used in operating
     activities...............  (5,373)  (4,643)  (6,619)    (4,409)   (14,136)
                               -------  -------  -------    -------   --------
Cash flows used in investing
 activities--purchase of
 furniture and equipment......    (800)    (525)    (572)      (356)    (1,314)
                               -------  -------  -------    -------   --------
Cash flows from financing
 activities:
 Principal payments on capital
  lease obligations...........    (185)    (192)     (78)       (60)       (11)
 Proceeds from issuance of
  promissory notes and
  warrants....................      --    1,500    1,000      1,000      7,000
 Proceeds from issuance of
  common stock................      11        9      362         29         48
 Proceeds from issuance of
  preferred stock.............   5,000    5,961   10,101      5,000      5,402
                               -------  -------  -------    -------   --------
    Net cash provided by
     financing activities.....   4,826    7,278   11,385      5,969     12,439
                               -------  -------  -------    -------   --------
Increase (decrease) in cash
 and cash equivalents.........  (1,347)   2,110    4,194      1,204     (3,011)
Cash and cash equivalents at
 beginning of year............   2,650    1,303    3,413      3,413      7,607
                               -------  -------  -------    -------   --------
Cash and cash equivalents at
 end of year.................. $ 1,303  $ 3,413  $ 7,607    $ 4,617   $  4,596
                               =======  =======  =======    =======   ========
Supplemental disclosure--cash
 paid during the year for:
 Interest..................... $    36  $     6  $     4    $     3   $     --
                               =======  =======  =======    =======   ========
Non-cash financing
 transaction--
 Exchange of promissory notes
  and related interest for
  redeemable convertible
  preferred stock............. $    --  $ 1,519  $ 1,007    $ 1,007   $     --
                               =======  =======  =======    =======   ========
</TABLE>

See accompanying notes to consolidated financial statements.

                                      F-6
<PAGE>

                           EFFICIENT NETWORKS, INC.

                  Notes to Consolidated Financial Statements

                   June 30, 1997 and 1998 and March 31, 1999

(1) Incorporation and Nature of Business

  Efficient Networks, Inc. (the "Company") was incorporated under the laws of
  the State of Delaware on June 10, 1993. The Company designs, develops,
  manufactures and sells Digital Subscriber Line ("DSL") customer premise
  equipment ("CPE") for the broadband access market.

(2) Summary of Significant Accounting Policies

    (a) Principles of Consolidation

    The consolidated financial statements include the accounts of the
    Company and its wholly-owned sales subsidiary located in The
    Netherlands. All significant intercompany accounts and transactions
    have been eliminated in consolidation.

    (b) Cash Equivalents

    Cash equivalents consist primarily of an investment account comprised
    of investments in commercial paper, repurchase agreements and money
    market funds. For purposes of the statements of cash flows, the Company
    considers all highly liquid investments with original maturities of
    three months or less to be cash equivalents.

    (c) Inventories

    Inventories are stated at the lower of average cost or market (net
    realizable value).

    (d) Furniture and Equipment

    Furniture and equipment are stated at cost. Equipment under capital
    leases is stated at the present value of minimum lease payments.

    Depreciation on plant and equipment is calculated on the straight-line
    method over the estimated useful lives of the assets. Plant and
    equipment held under capital leases and leasehold improvements are
    amortized on a straight-line basis over the shorter of the lease term
    or estimated useful life of the asset. The estimated useful lives are
    as follows:

<TABLE>
<CAPTION>
                                                    Years
                                                    -----
            <S>                                     <C>
            Computers..............................    5
            Software...............................    3
            Equipment..............................    5
            Furniture and fixtures.................    5
</TABLE>

    (e) Income Taxes

    Income taxes are accounted for under the asset and liability method.
    Deferred tax assets and liabilities are recognized for the future tax
    consequences attributable to differences between the financial
    statement carrying amounts of existing assets and liabilities and their
    respective tax bases and operating loss and tax credit carryforwards.
    Deferred tax assets and liabilities are measured using enacted tax
    rates expected to apply to taxable income in the years in which those
    temporary differences are expected to be recovered or settled. The
    effect on deferred tax assets and liabilities of a change in tax rates
    is recognized in income in the period that includes the enactment date.

                                      F-7
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999


    (f) Revenue Recognition

    Revenue from product sales is recognized upon shipment to the customer.
    Reserves for estimated sales returns and allowances are recorded in the
    same period as the related revenues. Revenue related to sales
    transactions that provide a customer with the right to return product
    is deferred until the product is deployed by the customer and/or the
    return privileges expire.

    (g) Stock-Based Compensation

    The Company applies the intrinsic value-based method of accounting
    prescribed by Accounting Principles Board ("APB") Opinion No. 25,
    Accounting for Stock Issued to Employees, and related interpretations,
    in accounting for its fixed plan stock options. As such, compensation
    expense would be recorded on the date of grant only if the current
    market price of the underlying stock exceeded the exercise price.

    (h) Impairment of Long-Lived Assets and Long-Lived Assets to Be Disposed

    Long-lived assets and certain identifiable intangibles are reviewed for
    impairment whenever events or changes in circumstances indicate that
    the carrying amount of an asset may not be recoverable. Recoverability
    of assets to be held and used is measured by a comparison of the
    carrying amount of an asset to future net cash flows expected to be
    generated by the asset. Assets to be disposed of are reported at the
    lower of the carrying amount or fair value less costs to sell.

    (i) Net Loss Per Share of Common Stock

    Net loss per share of common stock is presented in accordance with the
    provisions of Statement of Financial Accounting Standards ("SFAS") No.
    128, Earnings Per Share. Under SFAS No. 128, basic earnings/loss per
    share excludes dilution for potentially dilutive securities and is
    computed by dividing income or loss available to common stockholders by
    the weighted average number of common shares outstanding during the
    period. Diluted earnings/loss per share reflects the potential dilution
    that could occur if securities or other contracts to issue common stock
    were exercised or converted into common stock. Potentially dilutive
    securities are excluded from the computation of diluted earnings/loss
    per share when their inclusion would be antidilutive. The computation
    of basic and diluted weighted average shares is as follows (in
    thousands):

<TABLE>
<CAPTION>
                                                               Nine-month
                                Year ended June 30,           period ended
                              --------------------------  ---------------------
                                                           March 31,
                                                             1998     March 31,
                               1996     1997      1998    (unaudited)   1999
                              -------  -------  --------  ----------- ---------
     <S>                      <C>      <C>      <C>       <C>         <C>
     Numerator:
       Net loss.............. $(5,844) $(6,635) $ (9,291)   $(5,792)  $(14,075)
       Accretion of
        redeemable
        convertible preferred
        stock................      --       --        --         --       (263)
                              -------  -------  --------    -------   --------
       Numerator for basic
        and diluted net loss
        per share............ $(5,844) $(6,635) $ (9,291)   $(5,792)  $(14,338)
                              =======  =======  ========    =======   ========
     Denominator for basic
      and diluted net loss
      per share--weighted
      average common shares
      outstanding............   2,838    3,027     3,254      3,193      3,807
                              =======  =======  ========    =======   ========
</TABLE>

    Pro forma basic and diluted net loss per share has been calculated
    assuming: (a) the conversion of redeemable convertible preferred stock
    outstanding at June 30, 1998 and March 31, 1999, as if the

                                      F-8
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999

    redeemable convertible preferred stock had converted immediately upon
    its issuance, resulting in 19,631,974 and 22,870,213 additional shares
    of common stock outstanding, respectively; and (b) the warrants issued
    in January 1999 in connection with the issuance of subordinated
    promissory notes were exercised immediately upon their issuance using
    the principal amount of the notes to satisfy the exercise price,
    resulting in 399,544 additional shares of common stock outstanding and
    a charge of $2,747,000 against earnings for the accretion of the
    discount recorded on the notes; and (c) the warrants issued in April
    1999 in connection with the issuance of a subordinated promissory note
    were exercised at March 31, 1999 using the principal amount of the note
    to satisfy the exercise price, resulting in no incremental weighted
    average shares outstanding and a charge of $1,443,810 against earnings
    for the accretion of the discount recorded on the note.

    (j) Fair Value of Financial Instruments

    The carrying values of cash equivalents, accounts receivable and
    accounts payable approximate fair value due to their short maturities.
    The fair values of the Company's subordinated promissory notes and
    warrants were determined using a valuation model with the following
    assumptions: a volatility factor of 40% obtained from the stock price
    volatility experienced by certain of the Company's principal
    competitors; a risk-free interest rate of 5.71%; the contractual term
    of the respective notes; the estimated fair value of the Company's
    common stock ($10.25 at March 31, 1999); and exercise price of the
    detachable warrants. The estimated fair values of the January 1999
    subordinated promissory notes and warrants as of March 31, 1999 are
    approximately $7,000,000 and $18,700,000 respectively.

    (k) Comprehensive Income

    On July 1, 1998, the Company adopted SFAS No. 130, Reporting
    Comprehensive Income, which establishes standards for reporting and
    presentation of comprehensive income and its components in the
    financial statements. Comprehensive income includes all changes in
    equity during a period except those resulting from investments by and
    distributions to owners. To date, no elements of comprehensive income
    exist other than net loss from operations.

    (l) Pro Forma Balance Sheet

    The pro forma balance sheet reflects the following transactions as
    though they had occurred as of March 31, 1999 (see notes 6 and 7):

    .  the April 8, 1999 issuance of subordinated promissory notes with
       detachable warrants in exchange for $2,000,000,

    .  the conversion of $9,000,000 of subordinated promissory notes
       (including $2,000,000 of notes issued subsequent to March 31, 1999)
       into an aggregate of 3,082,191 shares of redeemable convertible
       preferred stock through the exercise of the warrants issued
       therewith, and

    .  the conversion of each outstanding share of redeemable convertible
       preferred stock into one share of common stock.

    (m) Use of Estimates

    Management of the Company has made a number of estimates and
    assumptions relating to the reporting of assets and liabilities and the
    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 to prepare these financial statements in
    conformity with generally accepted accounting principles. Actual
    results could differ from those estimates.

                                      F-9
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999


(3)Inventories

   Inventories consisted of the following (in thousands):

<TABLE>
<CAPTION>
                                                           June 30,
                                                         ------------- March 31,
                                                          1997   1998    1999
                                                         ------ ------ ---------
   <S>                                                   <C>    <C>    <C>
   Raw materials........................................ $  171 $  354  $1,634
   Finished goods.......................................    423    544   2,283
                                                         ------ ------  ------
   Total................................................ $  594 $  898  $3,917
                                                         ====== ======  ======
</TABLE>

(4)Furniture and Equipment

   Furniture and equipment consisted of the following (in thousands):

<TABLE>
<CAPTION>
                                                        June 30,
                                                     ---------------  March 31,
                                                      1997     1998     1999
                                                     -------  ------  ---------
   <S>                                               <C>      <C>     <C>
   Computers........................................ $ 1,766  $1,941   $2,606
   Purchased software...............................   1,411     611      855
   Equipment........................................     303     241      513
   Furniture and fixtures...........................      62      66      120
   Leasehold improvements...........................      97     121      191
                                                     -------  ------   ------
   Total furniture and equipment....................   3,639   2,980    4,285
   Less accumulated depreciation and amortization...  (2,080) (1,576)  (2,155)
                                                     -------  ------   ------
   Furniture and equipment, net..................... $ 1,559  $1,404   $2,130
                                                     =======  ======   ======
</TABLE>

   The Company leases certain equipment under capital lease arrangements. At
   June 30, 1997 and 1998, and March 31, 1999, the cost of assets under such
   leases aggregated $456,665, $152,183, and $152,183, respectively, and
   related accumulated amortization was $354,046, $134,065, and $152,183,
   respectively. Amortization of assets leased under capital lease
   arrangements is included in amortization expense.

(5)Accrued Liabilities

   Accrued liabilities consisted of the following (in thousands):

<TABLE>
<CAPTION>
                                                           June 30,
                                                        -------------- March 31,
                                                         1997   1998     1999
                                                        ------ ------- ---------
   <S>                                                  <C>    <C>     <C>
   Accrued compensation and benefits................... $   37 $   247  $  562
   Accrued professional fees...........................     53     320       3
   Accrued interest....................................     --      --     145
   Deferred rent.......................................     39      39      38
   Current portion of capital lease obligation.........     78      11      --
   Other...............................................     25     134     219
                                                        ------ -------  ------
   Total............................................... $  232 $   751  $  967
                                                        ====== =======  ======
</TABLE>

                                     F-10
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999


(6)Long-term debt

  In January 1999, the Company issued subordinated promissory notes with
  detachable warrants in exchange for $7,000,000 in cash. On April 8, 1999,
  the Company issued a subordinated promissory note with a detachable warrant
  in exchange for $2,000,000 in cash. The notes bear interest of 10% per
  annum and interest is payable quarterly. The notes are due at the earlier
  of January 2002 or (a) a consummation of a qualifying liquidation event
  which includes a firm commitment underwritten offering pursuant to a
  registration statement under the Securities Act of 1933, the public
  offering price of which is not less than $5.00 per share and $10,000,000 in
  the aggregate; (b) any consolidation or merger of the Company with or into
  any other corporation or corporations; (c) sale, conveyance or disposition
  of all or substantially all of the assets of the Company; or (d) the
  effectuation by the Company of a transaction or series of related
  transactions in which more than 50% of the voting power of the Company is
  disposed.

  The notes issued in January and April 1999 were issued with detachable
  warrants to purchase 2,397,260 shares and 684,931 shares, respectively, of
  the Company's Series H redeemable convertible preferred stock at an
  exercise price of $2.92 per share. The warrants expire at the earlier of
  January 2002 or the consummation by the Company of the sale of its common
  stock in a firm commitment underwritten offering at a price not less than
  $5.00 per share and providing not less than $10,000,000 of net proceeds.

  The proceeds were allocated between the notes and the warrants based on
  their pro-rata fair values, as determined using a valuation model (see note
  2(j)). As a result, the warrants issued in January and April were valued at
  $4,728,889 and $1,443,810, respectively. This amount was recorded as paid-
  in capital. The resulting discount on the notes is being accreted as
  interest expense over the expected term of the related promissory notes.

(7)Redeemable Convertible Preferred Stock

  Preferred stock has voting rights equal to the number of shares of common
  stock into which the preferred stock is convertible. The preferred stock is
  convertible at the option of the holder into such number of shares of
  common stock as is determined by dividing the original issue price of the
  preferred stock plus all declared but unpaid dividends by the applicable
  conversion price at the date of conversion. The conversion price per share
  is the original issue price adjusted for any dilution that may occur from
  future offerings.

  Each share of outstanding preferred stock will be required to convert to
  common stock upon the earlier of the time of the Company's initial public
  offering, if certain offering parameters are met, or the date on which the
  Company obtains the consent of the holders of a majority of the then
  outstanding shares of preferred stock.

  The outstanding preferred stock is redeemable into cash at the request of a
  majority of the holders of the then outstanding shares of preferred stock
  at an amount equal to the original issue price plus all declared but unpaid
  dividends. Amounts due to the preferred shareholders on redemption are
  payable in three equal annual installments on the fifth, sixth and seventh
  anniversaries of the original purchase dates.

  Dividends may be declared at the sole discretion of the Board of Directors
  and are noncumulative. To date, no such dividends have been declared. The
  holders of the preferred stock are entitled to a liquidation preference
  equivalent to the original issue price of the respective series of
  preferred stock plus declared but unpaid dividends.

  The following indicates the series of redeemable convertible preferred
  stock in existence at March 31, 1999. Series for which preferred stock has
  been issued and remains outstanding are stated at the redemption

                                     F-11
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999

  amount; issuance costs are netted against the proceeds and accreted as a
  charge against additional paid-in capital over the expected life of the
  related series of preferred stock (all in thousands, except share and per
  share data):

<TABLE>
<CAPTION>
                                           Dividend      June 30,
                                             Rate    ----------------  March 31,
                                           Per Share   1997    1998      1999
                                           --------- -------- -------  ---------
   <S>                                     <C>       <C>      <C>      <C>
   Series A--7,096,000 shares authorized;
    7,000,000 shares issued and
    outstanding..........................    $0.03   $  3,500 $ 3,500   $ 3,500

   Series B--522,848 shares authorized,
    issued and outstanding...............    $0.07        625     625       625

   Series C--5,895,832 shares authorized;
    5,858,332 shares issued and
    outstanding..........................    $0.07      7,030   7,030     7,030

   Series D--2,473,644 shares authorized,
    issued and outstanding...............    $0.12      5,000   5,000     5,000

   Series E--3,091,430 shares authorized,
    issued and outstanding...............    $0.15      7,480   7,480     7,480

   Series F--2,057,159 shares authorized,
    issued and outstanding in 1998 and
    1999.................................    $0.18         --   6,007     6,007

   Series G--6,000,000 shares authorized;
    1,866,800 and 3,716,800 shares issued
    and outstanding in 1998 and 1999.....    $0.18         --   5,451    10,853

   Issuance costs, net of accretion......                  --    (350)      (87)
                                                     -------- -------   -------
                                                     $ 23,635 $34,743   $40,408
                                                     ======== =======   =======
</TABLE>
   Series H--4,000,000 shares authorized,
    none issued or outstanding...........    $0.18         --      --        --


  The Company issued promissory notes in exchange for cash of $1,000,000 and
  $500,000 on September 17, 1996 and December 12, 1996, respectively. The
  promissory notes bore interest at 6% and were due on demand. On December
  31, 1996, the Company issued 3,091,430 shares of Series E redeemable
  convertible preferred stock in exchange for the principal and related
  accrued interest on the promissory notes amounting to $1,518,657 and
  $5,961,498 in cash.

  The Company issued promissory notes in exchange for $1,000,000 on January
  7, 1998. The promissory notes bore interest at 6% and were due on demand.
  On February 17, 1998, the Company issued 2,057,159 shares of Series F
  redeemable convertible preferred stock in exchange for the principal and
  related accrued interest on the promissory notes amounting to $1,006,904
  and $5,000,000 in cash.

  In June 1998, the Company issued 1,866,800 shares of Series G redeemable
  convertible preferred stock for $5,451,056 in cash. The issuance was
  recorded net of issuance costs of $350,000. In March 1999, the Company
  issued an additional 1,850,000 shares of Series G redeemable convertible
  preferred stock for $5,402,000 in cash.

(8)Stock Option Plan

  In 1993, the Company adopted a stock option plan (the "Plan") pursuant to
  which the Company's Board of Directors may grant stock options to officers,
  directors and key employees. The Plan authorizes grants of options to
  purchase up to 10,000,000 shares of unissued common stock. The Board of
  Directors determines the terms of each option, including exercise price
  (within limits set forth in the plan), number of shares and the rate at
  which each option is exercisable. The options generally vest ratably over a
  period of four years from the date of grant.

                                     F-12
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999


  In 1998, the Company adopted the Directors' Stock Option Plan (the
  "Directors' Plan") pursuant to which stock options may be granted to non-
  employee members of the Company's Board of Directors. The Directors' Plan
  authorizes grants of options to purchase up to 275,000 shares of common
  stock.

  Option grants under the Directors' Plan are nondiscretionary and automatic.
  Non-employee directors serving on the Company's board of directors at the
  date of the adoption of the Directors' Plan were granted options to
  purchase 50,000 shares on the effective date of the plan. Subsequent non-
  employee directors are granted an option to purchase 15,000 shares on the
  date they become a director. After their initial grant, non-employee
  directors are granted an option to purchase 15,000 shares on January 1 of
  each year provided they have served on the board for at least six months.
  At March 31, 1999, there were options to purchase 75,000 shares available
  for grant under the Directors' Plan.

  At March 31, 1999, there were options to purchase 2,404,728 shares
  available for grant under both plans. The per share weighted-average fair
  value of stock options granted during each of the years ended June 30,
  1996, 1997 and 1998 and the nine months ended March 31, 1999 was $1.92,
  $2.09, $2.60 and $7.72, respectively, on the date of grant as estimated
  using the minimum value option-pricing model with the following weighted-
  average assumptions in all years: expected dividend yield of 0.0%, an
  expected life of four years, and a risk-free interest rate of 6%.

  The Company applies APB Opinion No. 25 in accounting for stock options
  granted to employees and non-employee directors under its stock option
  plans. The Company recorded $1,425,000, $2,269,000, $3,143,000 and
  $13,130,000 of deferred stock option compensation during the years ended
  June 30, 1996, 1997 and 1998 and the nine months ended March 31, 1999,
  respectively, as a result of granting stock options with exercise prices
  below the estimated fair value per share of the Company's common stock at
  the date of grant. Deferred stock option compensation has been recorded as
  a component of stockholders' equity (deficit) and is being amortized as a
  charge to operations over the vesting period of the applicable options.
  Amortization of deferred stock option compensation of $198,000, $659,000,
  $1,165,000 and $1,899,000 was recognized in the years ended June 30, 1996,
  1997 and 1998 and the nine months ended March 31, 1999, respectively.

                                     F-13
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999

  Had the Company determined compensation cost based on the estimated fair
  value of stock options at the grant date in accordance with SFAS No. 123,
  the Company's net loss would have been increased or decreased, as
  applicable, to the pro forma amounts indicated below:

<TABLE>
<CAPTION>
                                                                    Nine months
                                           Year ended June 30,         ended
                                         -------------------------   March 31,
                                          1996     1997     1998       1999
                                         -------  -------  -------  -----------
   <S>                                   <C>      <C>      <C>      <C>
   Net loss:
     As reported.......................  $(5,844) $(6,635) $(9,291)  $(14,075)
     Pro forma.........................  $(5,762) $(6,680) $(9,687)  $(14,053)
   Basic and diluted net loss per share
    of common stock:
     As reported.......................  $ (2.06) $ (2.19) $ (2.86)  $  (3.77)
     Pro forma.........................  $ (2.03) $ (2.21) $ (2.98)  $  (3.69)
</TABLE>

  Pro forma net loss reflects only stock options granted after June 30, 1995.
  Therefore, the full impact of calculating compensation cost for stock
  options under SFAS No. 123 is not reflected in the pro forma net loss
  amounts presented above because compensation cost is reflected over the
  options' vesting periods of four years and compensation expense pertaining
  to stock options granted in prior periods is not considered.

  Stock option activity for both plans during the periods indicated is as
  follows:

<TABLE>
<CAPTION>
                                                                        Weighted
                                                                        Average
                                                             Number of  Exercise
                                                              shares     Price
                                                             ---------  --------
      <S>                                                    <C>        <C>
      Balance at June 30, 1996.............................. 2,396,500   $0.11
        Granted............................................. 1,716,883    0.24
        Exercised...........................................   (62,500)   0.15
        Forfeited...........................................  (454,883)   0.15
                                                             ---------
      Balance at June 30, 1997.............................. 3,596,000   $0.19
        Granted............................................. 1,631,000    0.58
        Exercised...........................................  (448,125)   0.12
        Forfeited...........................................  (344,458)   0.22
                                                             ---------
      Balance at June 30, 1998.............................. 4,434,417   $0.33
        Granted............................................. 2,473,500    2.37
        Exercised...........................................  (301,801)   0.14
        Forfeited...........................................  (135,541)   0.87
                                                             ---------
      Balance at March 31, 1999............................. 6,470,575   $1.11
                                                             =========
</TABLE>

  Options granted during the years ended June 30, 1996, 1997 and 1998 and the
  nine-month period ended March 31, 1999 had an exercise price less than the
  estimated fair value of the Company's common stock on the date of grant;
  the weighted-average grant-date fair value of options granted during those
  periods was $0.46, $1.37, $2.10 and $7.79, respectively.


                                     F-14
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999

  The following presents certain information about outstanding stock options
  at March 31, 1999:

<TABLE>
<CAPTION>
                                                                  Options
                                   Options outstanding          exercisable
                             ------------------------------- ------------------
                                          Weighted average             Weighted
                                        --------------------           average
                               Number   Exercise Contractual Number of exercise
    Range of exercise price  of options  price      life      options   price
    -----------------------  ---------- -------- ----------- --------- --------
   <S>                       <C>        <C>      <C>         <C>       <C>
    $0.05-0.25.............. 2,497,075   $0.19    6.9 years  1,728,443  $0.17
    $0.50-0.60.............. 1,547,500   $0.58    9.0 years    402,458  $0.57
    $1.50-2.50.............. 2,346,000   $2.23    9.5 years        --     --
    $7.50...................    75,000   $7.50    9.8 years        --     --
</TABLE>

  At June 30, 1996, 1997 and 1998, and at March 31, 1999, the number of
  options exercisable was 672,946, 1,227,480, 1,634,901 and 2,130,901,
  respectively, and the weighted-average exercise price of those options was
  $0.10, $0.15, $0.30 and $0.25, respectively.

(9)Research and Development Arrangements

  On October 31, 1997, the Company entered into a development and license
  agreement with a customer who owns preferred stock of the Company. The
  agreement obligated the Company to develop a product that meets mutually
  agreed upon specifications in exchange for $850,000. The Company has
  fulfilled its development obligations and the proceeds under the
  arrangement were offset against research and development expense during the
  year ended June 30, 1998.

  On November 11, 1997, the Company entered into a development and marketing
  agreement with a customer. The agreement obligated the Company to develop a
  product in accordance with certain specifications and to provide 114,068
  shares of the Company's common stock for an aggregate purchase price of
  $300,000. The common stock issuance was recorded at estimated fair value of
  $300,000. The Company has fulfilled its development obligations.

(10)Lease Commitments

  The Company has operating lease agreements relating to certain facilities
  and equipment which expire at various dates. Rent expense on operating
  leases for the years ended June 30, 1996, 1997 and 1998 and for the nine
  months ended March 31, 1999 was $270,122, $367,308, $380,794 and $267,388,
  respectively. Minimum lease payments for the three months ended June 30,
  1999 are $103,652. The Company entered into several agreements for the sale
  and leaseback of certain equipment. The leases were classified as capital
  leases and expired during the nine months ended March 31, 1999. Future
  minimum lease payments under noncancelable operating leases as of March 31,
  1999 are:

<TABLE>
<CAPTION>
                                                                       Operating
                                                                        Leases
                                                                       ---------
      <S>                                                              <C>
      Years ended June 30:
        2000.......................................................... $417,097
        2001..........................................................  329,765
        2002..........................................................  124,327
        2003..........................................................   35,955
        2004..........................................................    5,993
                                                                       --------
          Total minimum lease payments................................ $913,137
                                                                       ========
</TABLE>

                                     F-15
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999


  In connection with certain capital lease transactions, the Company issued
  warrants to purchase (a) 96,000 shares of Series A preferred stock at $0.50
  per share expiring on the earlier of December 16, 2003 or the fifth annual
  anniversary of the consummation of the Company's initial public offering of
  its common stock, if certain offering parameters are met, and (b) 37,500
  shares of its Series C preferred stock at $1.20 per share expiring on the
  later of March 13, 2005 or five years from the effective date of the
  Company's initial public offering.

(11)Income Taxes

  The Company has not recognized any tax benefits for its net operating loss
  carryforwards.

  Net deferred tax assets as of June 30, 1997 and 1998 and March 31, 1999 are
  as follows (in thousands):

<TABLE>
<CAPTION>
                                                         1997    1998    1999
                                                        ------  ------  -------
      <S>                                               <C>     <C>     <C>
      Deferred tax assets:
        Operating loss carryforwards................... $6,241  $8,943  $13,083
        Stock compensation.............................    237     419      684
        Receivables and inventory reserves.............     30      59      123
        Accrued liabilities............................    --       87      142
                                                        ------  ------  -------
          Deferred tax assets..........................  6,508   9,508   14,032
          Valuation allowance.......................... (6,238) (9,311) (13,976)
                                                        ------  ------  -------
                                                           270     197       56
      Deferred tax liability - furniture
         and equipment.................................   (270)   (197)     (56)
          Net deferred tax assets...................... $   --  $   --  $    --
                                                        ======  ======  =======
</TABLE>

  The net change in the valuation allowance for the years ended June 30, 1997
  and 1998 and for the nine months ended March 31, 1999 was $2,270,000,
  $3,073,000 and $4,665,000, respectively.

  As of March 31, 1999, the Company has net operating loss carryforwards of
  approximately $36,000,000 which begin to expire in 2008 and are available
  to reduce future regular federal income taxes, if any.

                                     F-16
<PAGE>

                           EFFICIENT NETWORKS, INC.

            Notes to Consolidated Financial Statements--(continued)

                   June 30, 1997 and 1998 and March 31, 1999

(12)Segment Information and Concentration of Credit Risk

  The Company operates in one reportable segment as it has one family of DSL
  products and markets its products to network equipment vendors and DSL
  service providers. In fiscal years 1996, 1997 and 1998 the Company also
  developed and marketed asynchronous transfer mode ("ATM") network products
  which are no longer actively marketed by the Company. The Company does not
  disaggregate financial information by product or geographically, other than
  export sales by region and sales by product, for management purposes.
  Substantially all of the Company's assets are located within the United
  States. The Company does not account for, and does not report to
  management, its assets or capital expenditures by revenue source. All of
  the Company's products are produced in the United States. The Company
  grants credit to customers located in several geographical regions in North
  America, Europe and the Pacific Rim. The following represents sales to
  customers in each of those geographical regions as a percentage of total
  revenues and revenues and gross margins by product line:

<TABLE>
<CAPTION>
                                                                       March 31,
      Geographic Region                         1996    1997    1998     1999
      -----------------                        ------  ------  ------  ---------
      <S>                                      <C>     <C>     <C>     <C>
      North America...........................     71%     65%     48%      65%
      Europe..................................     13%     25%     40%      15%
      Pacific Rim.............................     16%     10%     12%      20%
<CAPTION>
                                                                       March 31,
      Product line                              1996    1997    1998     1999
      ------------                             ------  ------  ------  ---------
      <S>                                      <C>     <C>     <C>     <C>
      DSL revenues............................ $  --   $  --   $   84   $5,573
      DSL gross margin........................ $  --   $  --   $  (19)  $ (327)
      ATM revenues............................ $3,687  $4,122  $3,286   $1,566
      ATM gross margin........................ $1,478  $1,736  $1,229   $  767
</TABLE>

  For the years ended June 30, 1996 and 1997, revenues from individual
  customers amounted to 13% and 38% of total revenue, respectively. For the
  year ended June 30, 1998, revenues from individual customers amounted to
  20% and 13% of total revenues. As of and for the nine months ended March
  31, 1999, revenues from individual customers amounted to 20% and 10% of
  total revenues, and accounts receivable related to these customers was
  approximately $1,120,000 and $702,000, respectively. The Company performs
  ongoing evaluations of its customers' financial conditions and generally
  does not require collateral.

(13)Subsequent Event (Unaudited)

  On June 28, 1999, we issued a $5.0 million convertible promissory note to
  Covad Communications. The note bears interest at the rate of 8.0% per year,
  and will be payable on the fifth anniversary of issuance. Covad will have
  the right to demand prepayment of 50% of the principal amount of the note
  at any time after the first anniversary and full prepayment at any time
  after the second anniversary of issuance. The note will be convertible at
  Covad's option into shares of Series I preferred stock at any time at a
  conversion price of $10.09 per share of Series I preferred stock. In
  addition, in the event we complete an initial public offering, the note
  will automatically convert into Series I preferred stock at a conversion
  price equal to the lesser of (1) 70% of the initial public offering price
  per share or (2) $10.09 per share. Assuming completion of this offering at
  an initial public offering price of $11.00 per share, the Covad note will
  convert into 649,350 shares of Series I preferred stock, and those shares
  will automatically convert into an equal number of shares of common stock.

                                     F-17
<PAGE>

                             INSIDE BACK COVER PAGE


     [Product pictures: Speedstream 3000, 4000 and 5000 Series with product
                                  packaging].
<PAGE>




                [LOGO OF EFFICIENT NETWORKS, INC. APPEARS HERE]

<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 13. Other Expenses of Issuance and Distribution

   The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by Efficient in connection with
the sale of common stock being registered. All amounts are estimates except the
SEC registration fee and the NASD filing fee.

<TABLE>
   <S>                                                               <C>
   SEC registration fee............................................. $   16,680
   NASD filing fee..................................................      6,500
   Nasdaq National Market listing fee...............................    150,000
   Printing and engraving costs.....................................    250,000
   Legal fees and expenses..........................................    300,000
   Accounting fees and expenses.....................................    175,000
   Blue Sky fees and expenses.......................................     10,000
   Transfer Agent and Registrar fees................................     10,000
   Miscellaneous expenses...........................................     81,820
                                                                     ----------
     Total.......................................................... $1,000,000
                                                                     ==========
</TABLE>

Item 14. Indemnification of Directors and Officers

   Section 145 of the Delaware General Corporation Law permits a corporation to
include in its charter documents, and in agreements between the corporation and
its directors and officers, provisions expanding the scope of indemnification
beyond that specifically provided by the current law.

   Article IX of the Registrant's Restated Certificate of Incorporation
provides that directors and officers may be indemnified to the fullest extent
permissible under Delaware law.

   Article VI of the Registrant's Bylaws provides for the indemnification of
officers and directors to the fullest extent permissible under Delaware law.

   The Registrant has entered into indemnification agreements with its
directors and executive officers, in addition to indemnification provided for
in the Registrant's Bylaws, and intends to enter into indemnification
agreements with any new directors and executive officers in the future.

   The Underwriting Agreement, Exhibit 1.1 hereto, provides for indemnification
by the Underwriters of the registrant and its executive officers and directors,
and by the registrant of the underwriters for certain liabilities, including
liabilities arising under the Securities Act, in connection with matters
specifically provided in writing by the Underwriters for inclusion in the
Registration Statement.

Item 15. Recent Sales of Unregistered Securities

   During the past three years, the Registrant has issued unregistered
securities to a limited number of persons as described below. In each case, we
relied on the exemption from registration provided by Section 4(2) of the
Securities Act.

   In September 1995, we sold 2,473,644 shares of Series D Preferred Stock to
Texas Instruments Incorporated at a purchase price of $2.02 per share.

   In December 1996, we sold 3,091,430 shares of Series E Preferred Stock to
accredited investors, including ADC Telecommunications, Inc., Aperture
Associates and funds affiliated with Crosspoint Venture Partners, El Dorado
Venture Partners, Enterprise Venture Partners, Menlo Ventures and Ocean
Ventures, at a purchase price of $2.42 per share.

                                      II-1
<PAGE>

   In November 1997, we sold 114,068 shares of Common Stock to DSC Telecom,
L.P. at a purchase price of $2.63 per share.

   In February 1998, we sold 2,057,159 shares of Series F Preferred Stock to
accredited investors, including ADC Telecommunications, Inc., Texas Instruments
and funds affiliated with Crosspoint Venture Partners, El Dorado Venture
Partners, Enterprise Venture Partners, Menlo Ventures and Ocean Park Ventures,
at a purchase price of $2.92 per share.

   In June 1998, we sold 1,866,800 shares of Series G Preferred Stock to
Siemens A.G. at a purchase price of $2.92 per share.

   In June 1998, we issued a warrant to purchase 34,246 shares of Series G
Preferred Stock at an exercise price of $2.92 per share to Hambrecht & Quist
LLC.

   In January 1999, we issued Subordinated Promissory Notes for an aggregate
principal amount of $7.0 million and warrants to purchase an aggregate of
2,397,260 shares of Series H Preferred Stock at an exercise price of $2.92 per
share to El Dorado Ventures IV, LP and Crosspoint Ventures LS 1997 LP.

   In March 1999, we sold 1,850,000 shares of Series G Preferred Stock to
Siemens A.G. at a purchase price of $2.92 per share.

   In April 1999, we issued a Subordinated Promissory Note for an aggregate
principal amount of $2.0 million and a warrant to purchase 684,931 shares of
Series H Preferred Stock at an exercise price of $2.92 per share to Palomar
Ventures L.P.

   In June 1999, we issued a convertible promissory note to an affiliate of
Covad Communications Group, Inc. for an aggregate principal amount of $5.0
million. The note is convertible into 649,350 shares of Series I Preferred
Stock at an exercise price of $10.09 per share and automatically converts in
our initial public offering at a price equal to the lesser of (1) 70% of the
initial public offering price per share or (2) $10.09 per share.

Item 16. Exhibits and Financial Statement Schedules

   (a) Exhibits

<TABLE>
<CAPTION>
 Exhibit
 Number
 -------
 <C>     <S>
   1.1*  Form of Underwriting Agreement.

   3.1*  Amended and Restated Certificate of Incorporation of the Registrant to
         be in effect immediately following the closing of the offering made
         under this Registration Statement.

   3.2*  Amended and Restated Bylaws of the Registrant to be in effect
         immediately following the closing of the offering made under this
         Registration Statement.

   4.1   Specimen Common Stock Certificate (standard form, not filed).

   5.1   Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.

  10.1*  Form of Indemnification Agreement between the Registrant and each of
         its directors and officers.

  10.2*  1999 Stock Plan and form of agreements thereunder.

  10.3*  1999 Employee Stock Purchase Plan and form of agreements thereunder.

  10.4*  Investors' Rights Agreement dated July 30, 1993 executed in connection
         with the issuance and sale of our Series A Preferred Stock.

  10.5*  Amendment No. 1 to the Investors' Rights Agreement dated February 9,
         1994, executed in connection with the issuance and sale of our Series
         B Preferred Stock.

  10.6*  Amendment No. 2 to the Investors' Rights Agreement dated September 30,
         1994, executed in connection with the issuance and sale of our Series
         C Preferred Stock.

  10.7*  Amendment No. 3 to the Investors' Rights Agreement dated September 1,
         1995, executed in connection with the issuance and sale of our Series
         D Preferred Stock.

  10.8*  Amendment No. 4 to the Investors' Rights Agreement dated December 31,
         1996, executed in connection with the issuance and sale of our Series
         E Preferred Stock.
</TABLE>

                                      II-2
<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number
 -------

 <C>     <S>
 10.9*   Amendment No. 5 to the Investors' Rights Agreement dated February 17,
         1998, executed in connection with the issuance and sale of our Series
         F Preferred Stock.

 10.10*  Amendment No. 6 to the Investors' Rights Agreement dated June 10,
         1998, executed in connection with the issuance and sale of our Series
         G Preferred Stock.

 10.11*  Amendment No. 7 to the Investors' Rights Agreement dated January 11,
         1999, executed in connection with the issuance and sale of our Series
         H Preferred Stock.

 10.12*  Geico Building Office Lease dated August 19, 1993 by and between
         Government Employees Insurance Company and Efficient.

 10.13*  Modification of Geico Office Lease dated May 8, 1995 by and between
         Government Employees Insurance Company and Efficient.

 10.14*  Graystone Office Park Lease dated September 8, 1998 by and between
         Lanny Houillion and Efficient.

 10.15*  Form of Agreement Regarding Conditional Exercise of Warrant between
         the Registrant, Warrant Holder and Wilson Sonsini Goodrich & Rosati,
         Professional Corporation.

 10.16*  Convertible Note Purchase Agreement dated June 22, 1999 by and between
         Covad Investment Corporation, and Efficient.

 10.17*  Form of Convertible Promissory Note to be issued to Covad Investment
         Corporation.

 23.1    Consent of Independent Auditors.

 23.2    Consent of Counsel (see Exhibit 5.1).

 24.1*   Power of Attorney (included on page II-4).

 27.1*   Financial Data Schedules.

 99.1*   Consent of Robert Hawk.

</TABLE>
- --------
*  Previously filed.

   (b) Financial Statement Schedules
<TABLE>
<CAPTION>
                                                      Page
                                                      ----
      <S>                                             <C>
      Independent Auditors' Report on Schedule        S-1
      Schedule II--Valuation and Qualifying Accounts  S-2
</TABLE>

   Schedules not listed above have been omitted because the information
required to be set forth therein is not applicable or is shown in the
Consolidated Financial Statements or notes thereto.

Item 17. Undertakings

   The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.

   Insofar as indemnification by the Registrant for liabilities arising under
the Securities Act may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the provisions referenced in Item 14 of
this Registration Statement or otherwise, the Registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification
is against public policy as expressed in the Securities Act, and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer, or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by a
director, officer or controlling person in connection with the securities being
registered hereunder, the Registrant will, unless in the opinion of its counsel
the matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed
by the final adjudication of such issue.

   The undersigned Registrant hereby undertakes that:

     (1) For purposes of determining any liability under the Securities Act,
  the information omitted from the form of Prospectus filed as part of this
  Registration Statement in reliance upon Rule 430A and

                                      II-3
<PAGE>

  contained in a form of Prospectus filed by the Registrant pursuant to Rule
  424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be
  part of this Registration Statement as of the time it was declared
  effective.

     (2) For the purpose of determining any liability under the Securities
  Act, each post-effective amendment that contains a form of Prospectus shall
  be deemed to be a new registration statement relating to the securities
  offered therein, and the offering of such securities at that time shall be
  deemed to be the initial bona fide offering thereof.

                                      II-4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Dallas,
State of Texas, on the 29th day of June, 1999.

                                         EFFICIENT NETWORKS, INC.


                                         By:     /s/ Mark A. Floyd
                                            ------------------------------------
                                                     Mark A. Floyd
                                         President and Chief Executive Officer

   Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated below.

<TABLE>
             Signature                           Title                                         Date
             ---------                           -----                                         ----
<S>                                    <C>                                                 <C>
   /s/    Mark A. Floyd                President, Chief Executive Officer                  June 29, 1999
- ----------------------------------       and Chairman of the
          Mark A. Floyd                  Board (Principal
                                         Executive Officer)




                *                      Vice President and Chief Financial                  June 29, 1999
- ----------------------------------       Officer (Principal
         Jill S. Manning                 Financial and
                                         Accounting Officer)


                *                      Director                                            June 29, 1999
- ----------------------------------
          Bruce W. Brown


                *                      Director                                            June 29, 1999
- ----------------------------------
          James P. Gauer


                *                      Director                                            June 29, 1999
- ----------------------------------
          Robert A. Hoff


                *                      Director                                            June 29, 1999
- ----------------------------------
      William L. Martin III


                *                      Director                                            June 29, 1999
- ----------------------------------
        Thomas H. Peterson


                                       Director
- ----------------------------------
         Anthony T. Maher


   */s/   Mark A. Floyd
- ----------------------------------
         Attorney-In-Fact
</TABLE>

                                      II-5
<PAGE>

                    Independent Auditors' Report on Schedule

The Board of Directors
Efficient Networks, Inc.:

  Under date of April 26, 1999, we reported on the consolidated balance sheets
of Efficient Networks, Inc. and subsidiary as of June 30, 1997 and 1998 and
March 31, 1999, and the related consolidated statements of operations,
stockholders' equity (deficit), and cash flows for each of the years in the
three-year period ended June 30, 1998 and for the nine months ended March 31,
1999, which are included in the prospectus. In connection with our audits of
the aforementioned consolidated financial statements, we also audited the
related consolidated financial statement schedule included in the registration
statement. This financial statement schedule is the responsibility of the
Company's management. Our responsibility is to express an opinion on this
financial statement schedule based on our audits.

  In our opinion, such consolidated financial statement schedule, when
considered in relation to the basic consolidated financial statements taken as
a whole, presents fairly, in all material respects, the information set forth
therein.

                                                KPMG LLP

Dallas, Texas
April 26, 1999

                                      S-1
<PAGE>

                            EFFICIENT NETWORKS, INC.

                 SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
                                    Additions  Additions
                         Balance at charged to charged to
                         beginning  costs and    other                Balance at
Description              of period   expenses   accounts  Deductions end of period
- -----------              ---------- ---------- ---------- ---------- -------------
<S>                      <C>        <C>        <C>        <C>        <C>
FOR THE NINE MONTHS
 ENDED
 MARCH 31, 1999
Allowances Deducted
 from Assets
 Accounts receivable...     $ 15        55        --         --          $ 70
 Inventories...........      150       130        --         --           280
                            ----       ---        ---        ---         ----
  Total Allowances
   Deducted from
   Assets..............     $165       185        --         --          $350
                            ====       ===        ===        ===         ====
FOR THE YEAR ENDED JUNE
 30, 1998
Allowances Deducted
 from Assets
 Accounts receivable ..     $ 25        11        --          21         $ 15
 Inventories...........       57       124        --          31          150
                            ----       ---        ---        ---         ----
  Total Allowances
   Deducted from Assets
   ....................     $ 82       135        --          52         $165
                            ====       ===        ===        ===         ====
FOR THE YEAR ENDED JUNE
 30, 1997
Allowances Deducted
 from Assets
 Accounts receivable...     $ 23         2        --         --          $ 25
 Inventories...........      --         57        --         --            57
                            ----       ---        ---        ---         ----
  Total Allowances
   Deducted from
   Assets..............     $ 23        59        --         --          $ 82
                            ====       ===        ===        ===         ====
FOR THE YEAR ENDED JUNE
 30, 1996
Allowances Deducted
 from Assets
 Accounts receivable...     $--         26        --           3         $ 23
 Inventories...........      --        --         --         --           --
                            ----       ---        ---        ---         ----
  Total Allowances
   Deducted from
   Assets..............     $--         26        --           3         $ 23
                            ====       ===        ===        ===         ====
</TABLE>

                                      S-2
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
 Number
 -------
 <C>     <S>
  1.1*   Form of Underwriting Agreement.

  3.1*   Amended and Restated Certificate of Incorporation of the Registrant to
         be in effect immediately following the closing of the offering made
         under this Registration Statement.

  3.2*   Amended and Restated Bylaws of the Registrant to be in effect
         immediately following the closing of the offering made under this
         Registration Statement.

  4.1    Specimen Common Stock Certificate (standard form, not filed).

  5.1    Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.

 10.1*   Form of Indemnification Agreement between the Registrant and each of
         its directors and officers.

 10.2*   1999 Stock Plan and form of agreements thereunder.

 10.3*   1999 Employee Stock Purchase Plan and form of agreements thereunder.

 10.4*   Investors' Rights Agreement dated July 30, 1993 executed in connection
         with the issuance and sale of our Series A Preferred Stock.

 10.5*   Amendment No. 1 to the Investors' Rights Agreement dated February 9,
         1994, executed in connection with the issuance and sale of our Series
         B Preferred Stock.

 10.6*   Amendment No. 2 to the Investors' Rights Agreement dated September 30,
         1994, executed in connection with the issuance and sale of our Series
         C Preferred Stock.

 10.7*   Amendment No. 3 to the Investors' Rights Agreement dated September 1,
         1995, executed in connection with the issuance and sale of our Series
         D Preferred Stock.

 10.8*   Amendment No. 4 to the Investors' Rights Agreement dated December 31,
         1996, executed in connection with the issuance and sale of our Series
         E Preferred Stock.

 10.9*   Amendment No. 5 to the Investors' Rights Agreement dated February 17,
         1998, executed in connection with the issuance and sale of our Series
         F Preferred Stock.

 10.10*  Amendment No. 6 to the Investors' Rights Agreement dated June 10,
         1998, executed in connection with the issuance and sale of our Series
         G Preferred Stock.

 10.11*  Amendment No. 7 to the Investors' Rights Agreement dated January 11,
         1999, executed in connection with the issuance and sale of our Series
         H Preferred Stock.

 10.12*  Geico Building Office Lease dated August 19, 1993 by and between
         Government Employees Insurance Company and Efficient.

 10.13*  Modification of Geico Office Lease dated May 8, 1995 by and between
         Government Employees Insurance Company and Efficient.

 10.14*  Graystone Office Park Lease dated September 8, 1998 by and between
         Lanny Houillion and Efficient.

 10.15*  Form of Agreement Regarding Conditional Exercise of Warrant between
         the Registrant, Warrant Holder and Wilson Sonsini Goodrich & Rosati,
         Professional Corporation.

 10.16*  Convertible Note Purchase Agreement dated June 22, 1999 by and between
         Covad Investment Corporation, and Efficient.

 10.17*  Form of Convertible Promissory Note to be issued to Covad Investment
         Corporation.

 23.1    Consent of Independent Auditors.

 23.2    Consent of Counsel (see Exhibit 5.1).

 24.1*   Power of Attorney (included on page II-4).

 27.1*   Financial Data Schedules.

 99.1*   Consent of Robert Hawk.

</TABLE>

- --------
*  Previously filed.

<PAGE>

                                                                     EXHIBIT 5.1

Efficient Networks, Inc.
4201 Spring Valley Road, Suite 1200
Dallas, TX 75244

RE:  REGISTRATION STATEMENT ON FORM S-1

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-1 filed by you with
the Securities and Exchange Commission (the "SEC") on or about June 23, 1999
(the "Registration Statement"), in connection with registration under the
Securities Act of 1933, as amended, of up to 4,000,000 shares of your Common
Stock and an over-allotment option granted to the underwriters of the offering
to purchase up to 600,000 shares from you (collectively, the "Shares"). We
understand that the Shares are to be sold to the underwriters of the offering
for resale to the public as described in the Registration Statement. As your
legal counsel, we have examined the proceedings taken, and are familiar with the
proceedings proposed to be taken, by you in connection with the sale and
issuance of the Shares.

     It is our opinion that, the Shares, when issued and sold in the manner
described in the Registration Statement, will be legally and validly
issued, fully paid and nonassessable.

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


                                Very truly yours,


                                /s/ WILSON SONSINI GOODRICH & ROSATI

                                WILSON SONSINI GOODRICH & ROSATI
                                Professional Corporation

<PAGE>

                                                                    EXHIBIT 23.1

                        Consent of Independent Auditors

The Board of Directors
Efficient Networks, Inc.

We consent to the use of our reports included herein and to the reference to
our firm under the heading "Experts" in the prospectus.

                                          KPMG LLP

Dallas, Texas

June 28, 1999


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