ADVENT INTERNATIONAL CORP ET AL
SC 13G/A, 2000-01-03
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<PAGE>   1

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


                                  SCHEDULE 13G
                                 (RULE 13d-102)


           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
            RULES 13d-1(b) (c), AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)
                              (AMENDMENT NO. 1)(1)

                                Lightbridge, Inc.
- --------------------------------------------------------------------------------
                                (Name of issuer)

                          Common Stock, par value $0.01
- --------------------------------------------------------------------------------
                         (Title of class of securities)

                                   53226-10-7
- --------------------------------------------------------------------------------
                                 (CUSIP number)

                                December 1, 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)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)


                       (Continued on the following pages)

                              (Page 1 of 10 Pages)


- --------------------------------
         (1)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 disclosures provided in a prior cover page.

         The information required on 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 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).
<PAGE>   2
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  2  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------


- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

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

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

         DELAWARE
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER

                                   NONE
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER
      BENEFICIALLY
         OWNED BY                  NONE
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER
         PERSON
          WITH:                    NONE
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER

                                   NONE
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         NONE
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         NOT APPLICABLE
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.0%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

                    CO,IA
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   3
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  3  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------

- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         ADVENT INTERNATIONAL LIMITED PARTNERSHIP
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                        (a) [X]
                                                                        (b)
- --------------------------------------------------------------------------------
3.       SEC USE ONLY

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

         DELAWARE
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER

                                   NONE
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER
      BENEFICIALLY
         OWNED BY                  NONE
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER
         PERSON
          WITH:                    NONE
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER

                                   NONE
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         NONE
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         NOT APPLICABLE
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.0%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   4
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  4  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------


- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         GLOBAL PRIVATE EQUITY II LIMITED PARTNERSHIP
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                        (a) [X]
                                                                        (b)
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


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

         DELAWARE
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER

                                   NONE
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER
      BENEFICIALLY
         OWNED BY                  NONE
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER
         PERSON
          WITH:                    NONE
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER

                                   NONE
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         NONE
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         NOT APPLICABLE
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.0%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   5
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  5  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------


- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         ADVENT INTERNATIONAL INVESTORS II LIMITED PARTNERSHIP
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                        (a) [X]
                                                                        (b)
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


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

         MASSACHUSETTS
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER

                                   NONE
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER
      BENEFICIALLY
         OWNED BY                  NONE
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER
         PERSON
          WITH:                    NONE
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER

                                   NONE
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         NONE
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         NOT APPLICABLE
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.0%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

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


                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   6
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  6  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------


- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         ADVENT PARTNERS LIMITED PARTNERSHIP
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                        (a) [X]
                                                                        (b)
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


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

         DELAWARE
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER

                                   NONE
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER
      BENEFICIALLY
         OWNED BY                  NONE
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER
         PERSON
          WITH:                    NONE
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER

                                   NONE
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         NONE
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         NOT APPLICABLE
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.0%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   7
CUSIP NO. 53226-10-7              Schedule 13G                      Page 7 of 10


ITEM 1.

         (a) (b) This statement on Schedule 13G relates to the Reporting
Persons' (as defined in Item 2 below) beneficial ownership interest in
Lightbridge, Inc. a Delaware corporation (the "Corporation"). The address of the
principal executive office of the Corporation is 67 South Bedford Street,
Burlington, MA 01803.

ITEM 2.

         (a) (b) (c)       This statement is being filed by the following
entities:


         (1)      Advent International Corporation, a Delaware corporation;

         (2)      Advent International Limited Partnership, a Delaware limited
                  partnership;

         (3)      Global Private Equity II Limited Partnership, a Delaware
                  limited partnership;

         (4)      Advent International Investors II Limited Partnership, a
                  Massachusetts limited partnership;

         (5)      Advent Partners Limited Partnership, a Delaware limited
                  partnership;

         The entities listed in subparagraph (1) through (5) above are herein
collectively referred to as the "Reporting Persons" and individually as a
"Reporting Person." The principal business address of all of the Reporting
Persons is c/o Advent International Corporation, 75 State Street, Boston, MA
02109.

(d) (e) This statement relates to the Common Stock, par value $0.01 per share,
(the "Common Stock") of the Corporation named in Item 1 of this statement. The
CUSIP number associated with such Common Stock is 53226-10-7.



<PAGE>   8



CUSIP NO. 53226-10-7              Schedule 13G                      Page 8 of 10


ITEM 3.  FILING PURSUANT TO RULE 13G-1(b), OR 13G-2(b).

         This statement is not being filed pursuant to Rule 13d-1(b), or
13d-2(b) or (c). This statement is being filed pursuant to rule 13d-1(c).


ITEM 4.  OWNERSHIP.

(a) (b) The following table sets forth the aggregate number and percentage
(based upon the number of shares of Common Stock outstanding as of September 30,
1999) of the Common Stock beneficially owned by each Reporting Person named in
Item 2 of this statement. The aggregate number and percentage of the Common
Stock beneficially owned by each Reporting Person is calculated in accordance
with Rule 13G-3(d)(1).


                                            Number of Shares         Percentage
                                          --------------------        of Shares
Reporting Person                          Common         Total       Outstanding
- ---------------------------------------   ------         -----       -----------
Global Private Equity II Limited
Partnership (1)                                0             0          0.0%
                                          ------         -----          ----
Advent International Limited
Partnership (1)                                0             0          0.0%
Advent Partners Limited Partnership (2)        0             0          0.0%
Advent International Investors II
Limited Partnership (2)                        0             0          0.0%
                                          ------         -----          ----
Advent International Corporation               0             0          0.0%
                                          ======         =====          ----

Total Group Ownership                          0             0          0.0%
                                          ======         =====          ====

         (1) Advent International Corporation ("AIC") is the General Partner of
Advent International Limited Partnership ("AILP") which in turn is the General
Partner of the indicated reporting persons. As such, AIC has the sole power to
vote and dispose of the securities owned by the indicated reporting persons. The
beneficial ownership of AIC and AILP derive from such power.


<PAGE>   9

CUSIP NO. 53226-10-7              Schedule 13G                      Page 9 of 10


         (2) AIC is the General Partner of the indicated reporting person. As
such, AIC has the power to vote and dispose of the securities of APLP. The
beneficial ownership of AIC derives from such power.

         (c) Each of the Reporting Persons listed in the table set forth above
has sole voting and dispositive power over the Common Stock beneficially owned
by it as indicated above.

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

         This Statement is being filed to report the fact that the Reporting
Persons have ceased to be the beneficial owners of greater than 5% or more of
the Issuer's Common Stock.

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.

         The information for this item is contained on the individual cover
pages to this filing, and is incorporated herein by reference.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP.

         Not Applicable.

ITEM 10. CERTIFICATION.

         By signing below we certify that, to the best of our knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.



<PAGE>   10


CUSIP NO. 53226-10-7              Schedule 13G                     Page 10 of 10



                                    SIGNATURE

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


December 9, 1999




ADVENT INTERNATIONAL CORPORATION
By:  Janet L. Hennessy
     Vice President         /s/ Janet L. Hennessy
                            -------------------------

GLOBAL PRIVATE EQUITY II LIMITED PARTNERSHIP
By:  Advent International Limited Partnership,
     General Partner
By:  Advent International Corporation,
     General Partner
By:  Janet L. Hennessy
     Vice President         /s/ Janet L. Hennessy
                            -------------------------

ADVENT INTERNATIONAL LIMITED PARTNERSHIP
By:  Advent International Corporation,
     General Partner
By:  Janet L. Hennessy
     Vice President         /s/ Janet L. Hennessy
                            -------------------------

ADVENT INTERNATIONAL INVESTORS II LIMITED PARTNERSHIP
By:  Advent International Corporation,
     General Partner
By:  Janet L. Hennessy
     Vice President         /s/ Janet L. Hennessy
                            -------------------------

ADVENT PARTNERS LIMITED PARTNERSHIP
By:  Advent International Corporation,
     General Partner
By:  Janet L. Hennessy
     Vice President         /s/ Janet L. Hennessy
                            -------------------------



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