ADVENT INTERNATIONAL CORP ET AL
SC 13G, 1997-02-14
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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.----)*

                               LIGHTBRIDGE, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                        COMMON STOCK, $.001 PAR VALUE
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                 53226-10-7
                       -------------------------------
                                (CUSIP Number)


Check the following box if a fee is being paid with this statement [x].  (A fee
is not required only if the filing person:  (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.) 
(See Rule 13d-7).

*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).






<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                           
                                                                               
                                   2,000,000                           
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  NONE                                         
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    2,000,000                                   
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     

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

         2,000,000       
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         13.7%
- --------------------------------------------------------------------------------
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                           
                                                                               
                                   1,905,000                           
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  NONE                                         
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    1,905,000                                   
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     

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

         1,905,000       
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         13.1%
- --------------------------------------------------------------------------------
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                           
                                                                               
                                   1,905,000                           
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  NONE                                         
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    1,905,000                                   
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     

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

         1,905,000       
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         13.1%
- --------------------------------------------------------------------------------
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                           
                                                                               
                                   1,668                               
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  NONE                                         
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    1,668                                       
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     

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

         1,668           
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         
- --------------------------------------------------------------------------------
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                           
                                                                               
                                   93,332                              
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  NONE                                         
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    93,332                                      
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     

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

         93,332         
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
         
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         0.6%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON*

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

                      *SEE INSTRUCTION BEFORE FILLING OUT!


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

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 281 Winter Street, Waltham, MA 02154.

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 subparagraphs (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, 101 Federal Street, Boston, MA
02110.

     (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 532226-10-7.


<PAGE>   8
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  8  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------
                                  SCHEDULE 13G


Item 3.   Filing pursuant to Rule 13G-1(b), or 13G-2(b).
- -------   ----------------------------------------------

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

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
December 31, 1996) 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).

<TABLE>
<CAPTION>
                                                Number of Shares         Percentage
                                         --------------------------       of Shares
Reporting Person                           Common           Total        Outstanding
- --------------------------------------   --------------------------------------------
<S>                                      <C>              <C>               <C>  
Global Private Equity II Limited
Partnership (1)                          1,905,000        1,905,000         13.1%
                                         ---------        ---------         -----
Advent International Limited
Partnership (1)                          1,905,000        1,905,000         13.1%
Advent Partners Limited Partnership (2)     93,332           93,332          0.6%
Advent International Investors II
Limited Partnership (2)                      1,668            1,668          0.0%
                                         ---------        ---------         -----
Advent International Corporation         2,000,000        2,000,000         13.7%
                                         ---------        ---------         -----

Total Group Ownership                    2,000,000        2,000,000         13.7%
                                         =========        =========         =====
</TABLE>

     (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 derives from such power.


<PAGE>   9
- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  9  of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------
                                  SCHEDULE 13G


     (2) AIC is the General Partner of both Advent Partners Limited Partnership
("APLP") and Advent International Investors II Limited Partnership ("AI
Investors II"). As such, AIC has the sole power to vote and dispose of the
securities owned by AI Investors II and 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.
- -------   ---------------------------------------------

          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.
- -------   ----------------------------------------------------------

          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.


            (THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK)
            --------------------------------------------------------



<PAGE>   10

- ---------------------------                         ---------------------------
  CUSIP No.  532226-10-7              13G                 Page  10 of  10
             -----------                                       ---    ----
- ---------------------------                         ---------------------------
                                  SCHEDULE 13G


Item 10.  Certification.
- --------  --------------

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


                                    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.


February 11, 1997


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

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

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

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

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



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