ENTERPRISE PARTNERS II L P
SC 13G, 2000-02-11
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<PAGE>   1



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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO. ______)*

                            EFFICIENT NETWORKS, INC.
                            ------------------------
                                (Name of Issuer)

                                  COMMON STOCK
                         ------------------------------
                         (Title of Class of Securities)

                                   282056 10 0
                                 --------------
                                 (CUSIP Number)

                                  July 14, 1999
             -------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ]      Rule 13d-1(b)

[ ]      Rule 13d-1(c)

[X]      Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.


<PAGE>   2




CUSIP NO. 282056 10 0            13G                          PAGE 2 OF 12 PAGES

 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE PARTNERS II, L.P.        33-0375919
- --------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
- --------------------------------------------------------------------------------
 3          SEC USE ONLY

- --------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE

- --------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   3,248,741
                               -------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               -------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  3,248,741
                               -------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

             WITH:                   0
- --------------------------------------------------------------------------------

 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            3,248,741
- --------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

- --------------------------------------------------------------------------------
 11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            6.35%
- --------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   3

CUSIP NO. 282056 10 0            13G                          PAGE 3 OF 12 PAGES

 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE PARTNERS II ASSOCIATES, L.P.        33-0400545
- --------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
- --------------------------------------------------------------------------------
 3          SEC USE ONLY

- --------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE

- --------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   295,321
                               -------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               -------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  295,321
                               -------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

             WITH:                   0
- --------------------------------------------------------------------------------

 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            295,321
- --------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

- --------------------------------------------------------------------------------
 11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            0.58%
- --------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   4
CUSIP NO. 282056 10 0            13G                          PAGE 4 OF 12 PAGES

 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE MANAGEMENT PARTNERS II, L.P.        33-0378554
- --------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
- --------------------------------------------------------------------------------
 3          SEC USE ONLY

- --------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE

- --------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   3,544,062
                               -------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               -------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  3,544,062
                               -------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

             WITH:                   0
- --------------------------------------------------------------------------------

 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            3,544,062
- --------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

- --------------------------------------------------------------------------------
 11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            6.93%
- --------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   5
CUSIP NO. 282056 10 0            13G                          PAGE 5 OF 12 PAGES

 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ANDREW E. SENYEI
- --------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
- --------------------------------------------------------------------------------
 3          SEC USE ONLY

- --------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA

- --------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               -------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  3,544,062
                               -------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               -------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

             WITH:                   3,544,062
- --------------------------------------------------------------------------------

 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            3,544,062
- --------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

- --------------------------------------------------------------------------------
 11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            6.93%
- --------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   6
CUSIP NO. 282056 10 0            13G                          PAGE 6 OF 12 PAGES

 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            JAMES H. BERGLUND
- --------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
- --------------------------------------------------------------------------------
 3          SEC USE ONLY

- --------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA

- --------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               -------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  3,544,062
                               -------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               -------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

             WITH:                   3,544,062
- --------------------------------------------------------------------------------

 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            3,544,062
- --------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

- --------------------------------------------------------------------------------
 11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            6.93%
- --------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   7

ITEM 1.

         (a)  Name of Issuer: EFFICIENT NETWORKS, INC.

         (b)  Address of Issuer's Principal Executive Offices:
              4201 SPRING VALLEY ROAD, SUITE 1200, DALLAS, TEXAS 75244

ITEM 2.

         (a)  Name of Person Filing: ENTERPRISE PARTNERS II, L.P. ("EPII")
              ENTERPRISE PARTNERS II ASSOCIATES, L.P. ("EPAII")
              ENTERPRISE MANAGEMENT PARTNERS II, L.P. ("EMPII")
              ANDREW E. SENYEI ("AES")
              JAMES H. BERGLUND ("JHB")

         (b)  Address of Principal Business Office or, if none, Residence: 7979
              IVANHOE, SUITE 550, LA JOLLA, CALIFORNIA 92037

         (c)  Citizenship: ENTITIES:
              EPII - DELAWARE
              EPAII - DELAWARE
              EMPII - DELAWARE

              INDIVIDUALS:
              AES - USA
              JHB - USA

         (d)  Title of Class of Securities: COMMON STOCK

         (e)  CUSIP Number: 282056 10 0

ITEM 3. NOT APPLICABLE


<PAGE>   8


ITEM 4.  OWNERSHIP

         (a)  Provide the following information regarding the aggregate number
              and percentage of the class of securities of the issuer identified
              in Item 1.

<TABLE>
<CAPTION>

                         EPII         EPAII        EMPII         AES           JHB

<S>                    <C>           <C>          <C>          <C>           <C>
 (a) AMOUNT            3,248,741     295,321      3,544,062    3,544,062     3,544,062
     BENEFICIALLY
     OWNED:

 (b) PERCENT OF        6.35%         0.58%        6.93%        6.93%         6.93%
     CLASS:

 (c) NUMBER OF
     SHARES AS TO
     WHICH SUCH
     PERSON HAS:

  (i) SOLE POWER TO    3,248,741     295,321      3,544,062    0             0
      VOTE OR DIRECT
      THE VOTE:

 (ii) SHARED POWER     0             0            0            3,544,062     3,544,062
      TO VOTE OR TO
      DIRECT THE VOTE:

(iii) SOLE POWER TO    3,248,741     295,321      3,544,062    0             0
      DISPOSE OR TO
      DIRECT THE
      DISPOSITION OF:

 (iv) SHARED POWER     0             0            0            3,544,062     3,544,062
      TO DISPOSE OR
      TO DIRECT THE
      DISPOSITION OF:
</TABLE>

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

         NOT  APPLICABLE

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

         NOT  APPLICABLE

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

         NOT  APPLICABLE

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

         NO REPORTING PERSON IS A MEMBER OF A GROUP AS DEFINED IN SECTION
         240.13d-1(b)(1)(ii)(H) OF THE ACT.

ITEM 9.  NOTICE OF DISSOLUTION OF A GROUP

         NOT  APPLICABLE

ITEM 10. CERTIFICATION

         NOT  APPLICABLE

EXHIBITS: A: JOINT FILING STATEMENT


<PAGE>   9




                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

         Date:  February 11, 2000

<TABLE>
<S>                                                             <C>
ENTERPRISE PARTNERS II, L.P.                                    ENTERPRISE PARTNERS ASSOCIATES II, L.P.

By:  Enterprise Management Partners II, L.P.,                   By:  Enterprise Management Partners II, L.P.,
         its general partner                                             its general partner

BY:      /s/ Andrew E. Senyei                                   BY:      /s/ Andrew E. Senyei
     -------------------------------                                 --------------------------------
         Andrew E. Senyei                                                Andrew E. Senyei
         General Partner                                                 General Partner

ENTERPRISE MANAGEMENT PARTNERS II, L.P.

BY:      /s/ Andrew E. Senyei
     -------------------------------
         Andrew E. Senyei
         General Partner
</TABLE>

INDIVIDUALS:

         /s/ Andrew E. Senyei
     -------------------------------
             Andrew E. Senyei

         /s/ James H. Berglund
     -------------------------------
             James H. Berglund


         The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative other than an
executive officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including exhibits. See Section 240.13d-7 for other
parties for whom copies are to be sent.

         ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)


<PAGE>   10




                                    EXHIBIT A

                             JOINT FILING STATEMENT

         Pursuant to Rule 13d-1(k)(1), we, the undersigned, hereby express our
agreement that the attached Schedule 13G is filed on behalf of each of us.

         Date:  February 11, 2000

<TABLE>
<S>                                                             <C>    <C>    <C>    <C>    <C>    <C>
ENTERPRISE PARTNERS II, L.P.                                    ENTERPRISE PARTNERS ASSOCIATES II, L.P.

By:  Enterprise Management Partners II, L.P.,                   By:  Enterprise Management Partners II, L.P.,
         its general partner                                             its general partner

BY:      /s/ Andrew E. Senyei                                   BY:      /s/ Andrew E. Senyei
     -------------------------------                                 --------------------------------
         Andrew E. Senyei                                                Andrew E. Senyei
         General Partner                                                 General Partner

ENTERPRISE MANAGEMENT PARTNERS II, L.P.

BY:      /s/ Andrew E. Senyei
     -------------------------------
         Andrew E. Senyei
         General Partner
</TABLE>

INDIVIDUALS:

         /s/ Andrew E. Senyei
     -------------------------------
             Andrew E. Senyei

         /s/ James H. Berglund
     -------------------------------
             James H. Berglund


<PAGE>   11


                          INSTRUCTIONS FOR SCHEDULE 13G

INSTRUCTIONS FOR COVER PAGE

(1)   Names And I.R.S. Numbers of Reporting Persons - Furnish the full legal
      name of each person for whom the report is filed -- i.e., each person
      required to sign the schedule itself -- including each member of a group.
      Do not include the name of a person required to be identified in the
      report but who is not a reporting person. Reporting persons that are
      entities are also requested to furnish their I.R.S. identification
      numbers, although disclosure of such numbers is voluntary, not mandatory
      (see "SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G", below).

(2)   If any of the shares beneficially owned by a reporting person are held as
      a member of a group and such membership is expressly affirmed, please
      check row 2(a). If the reporting person disclaims membership in a group or
      describes a relationship with other persons but does not affirm the
      existence of a group, please check row 2(b) [unless a joint filing
      pursuant to Rule 13d-1(k)(1) in which case it may not be necessary to
      check row 2(b)].

(3)   The third row is for SEC internal use; please leave blank.

(4)   Citizenship or Place of Organization - Furnish citizenship if the named
      reporting person is a natural person. Otherwise, furnish place of
      organization.

(5) - (9), (11) Aggregate Amount Beneficially Owned By Each Reporting Person,
      Etc. - Rows (5) through (9) inclusive, and (11) are to be completed in
      accordance with the provisions of Item 4 of Schedule 13G. All percentages
      are to be rounded off to the nearest tenth (one place after decimal
      point).

(10)  Check if the aggregate amount reported as beneficially owned in row (9)
      does not include shares as to which beneficial ownership is disclaimed
      pursuant to Rule 13d-4 [17 CFR 240.13d-4] under the Securities Exchange
      Act of 1934.

(12)  Type of Reporting Person - Please classify each "reporting person"
      according to the following breakdown (see Item 3 of Schedule 13G) and
      place the appropriate symbol on the form:

<TABLE>
<CAPTION>
      CATEGORY                                                                       SYMBOL
     <S>                                                                            <C>
      Broker Dealer.............................................................       BD
      Bank......................................................................       BK
      Insurance Company.........................................................       IC
      Investment Company........................................................       IV
      Investment Adviser........................................................       IA
      Employee Benefit Plan, Pension Fund, or Endowment Fund....................       EP
      Parent Holding Company/Control Person.....................................       HC
      Savings Association.......................................................       SA
      Church Plan...............................................................       CP
      Corporation...............................................................       CO
      Partnership...............................................................       PN
      Individual................................................................       IN
      Other.....................................................................       OO
</TABLE>

      Notes:

               Attach as many copies of the second part of the cover page as are
      needed, one reporting person per page.

               Filing persons may, in order to avoid unnecessary duplication,
      answer items on the schedules (Schedule 13D, 13G or 14D-1) by appropriate
      cross references to an item or items on the cover page(s). This approach
      may only be used where the cover page item or items provide all the
      disclosure required by the schedule item. Moreover, such a use of a cover
      page item will result in the item becoming a part of the schedule and
      accordingly being considered as "filed" for purposes of Section 18 of the
      Securities Exchange Act or otherwise subject to the liabilities of that
      section of the Act.


<PAGE>   12

               Reporting persons may comply with their cover page filing
      requirements by filing either completed copies of the blank forms
      available from the Commission, printed or typed facsimiles, or computer
      printed facsimiles, provided the documents filed have identical formats to
      the forms prescribed in the Commission's regulations and meet existing
      Securities Exchange Act rules as to such matters as clarity and size
      (Securities Exchange Act Rule 12b-12).

              SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G

         Under Sections 13(d), 13(g) and 23 of the Securities Exchange Act of
1934 and the rules and regulations thereunder, the Commission is authorized to
solicit the information required to be supplied by this schedule by certain
security holders of certain issuers.

         Disclosure of the information specified in this schedule is mandatory,
except for I.R.S. identification numbers, disclosure of which is voluntary. The
information will be used for the primary purpose of determining and disclosing
the holdings of certain beneficial owners of certain equity securities. This
statement will be made a matter of public record. Therefore, any information
given will be available for inspection by any member of the public.

         Because of the public nature of the information, the Commission can use
it for a variety of purposes, including referral to other governmental
authorities or securities self-regulatory organizations for investigatory
purposes or in connection with litigation involving the Federal securities laws
or other civil, criminal or regulatory statutes or provisions. I.R.S.
identification numbers, if furnished, will assist the Commission in identifying
securityholders and, therefore, in promptly processing statements of beneficial
ownership of securities.

         Failure to disclose the information requested by this schedule, except
for I.R.S. identification numbers, may result in civil or criminal action
against the persons involved for violation of the Federal securities laws and
rules promulgated thereunder.

                              GENERAL INSTRUCTIONS

A.       Statements filed pursuant to Rule 13d-1(b) containing the information
         required by this schedule shall be filed not later than February 14
         following the calendar year covered by the statement or within the time
         specified in Rules 13d-1(b)(2) and 13d-2(c). Statements filed pursuant
         to Rule 13d-1(c) shall be filed within the time specified in Rules
         13d-1(c), 13d-2(b) and 13d-2(d). Statements filed pursuant to Rule
         13d-1(d) shall be filed not later than February 14 following the
         calendar year covered by the statement pursuant to Rules 13d-1(d) and
         13d-2(b).

B.       Information contained in a form which is required to be filed by rules
         under section 13(f) (15 U.S.C. 78m(f)) for the same calendar year as
         that covered by a statement on this schedule may be incorporated by
         reference in response to any of the items of this schedule. If such
         information is incorporated by reference in this schedule, copies of
         the relevant pages of such form shall be filed as an exhibit to this
         schedule.

C.       The item numbers and captions of the items shall be included but the
         text of the items is to be omitted. The answers to the items shall be
         so prepared as to indicate clearly the coverage of the items without
         referring to the text of the items. Answer every item. If an item is
         inapplicable or the answer is in the negative, so state.




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