UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 3)*
IDENIX PHARMACEUTICALS, INC.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
45166R 20 4
(CUSIP Number)
December 31, 2009
(Date of Event Which Requires Filing of This Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
  o   Rule 13d-1(b)
 
  o   Rule 13d-1(c)
 
  þ   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).
 
 

 


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

BB BioVentures L.P.
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   2,949,488
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   2,949,488
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  2,949,488
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  4.5%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  PN

Page 2 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

MPM BioVentures Parallel Fund, L.P.
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   256,519
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   256,519
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  256,519
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  0.4%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  PN

Page 3 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

MPM Asset Management Investors 1998 LLC
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   37,299
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   37,299
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  37,299
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  0.1%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  OO

Page 4 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

MPM Asset Management LLC
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   78,228
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   78,228
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  78,228
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  0.1%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  OO

Page 5 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

MPM BioVentures I, L.P.
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   256,519*
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   256,519*
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  256,519*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  0.4%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  PN
* The shares are held by MPM BioVentures Parallel Fund, L.P., of which the Reporting Person is its general partner.

Page 6 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

MPM BioVentures I LLC
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   3,206,007*
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   3,206,007*
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  3,206,007*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  4.8%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  OO
** The shares are held as follows: 256,519 by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”) and 2,949,488 by BB BioVentures, L.P. (“BB BioVentures”). The Reporting Person is the indirect general partner of MPM Parallel and BB BioVentures.

Page 7 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

BAB BioVentures L.P.
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Delaware
       
  5   SOLE VOTING POWER
     
NUMBER OF   2,949,488*
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   2,949,488*
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  2,949,488*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  4.5%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  PN
** The shares are by BB BioVentures, L.P., of which the Reporting Person is the direct general partner.

Page 8 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

BAB BioVentures, N.V.
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  Netherlands Antilles
       
  5   SOLE VOTING POWER
     
NUMBER OF   2,949,488*
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   2,949,488*
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  2,949,488*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  4.5%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  PN
** The shares are by BB BioVentures, L.P., of which the Reporting Person is the indirect general partner.

Page 9 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

Ansbert Gadicke
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  United States
       
  5   SOLE VOTING POWER
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   3,321,534*
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    3,321,534*
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  3,321,534*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  5.0%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  IN
*The shares are held as follows: 2,949,488 by BB BioVentures L.P. (“BB BioVentures”), 256,519 by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”), 37,299 by MPM Asset Management Investors 1998 LLC (“MPM Investors”) and 78,228 by MPM Asset Management LLC (“AM LLC”). MPM BioVentures I, L.P. and MPM BioVentures I LLC (“BioVentures LLC”) are the direct and indirect general partners of MPM Parallel. BAB BioVentures L.P. (“BAB BV”), BAB BioVentures NV and BioVentures LLC are the direct and indirect general partners of BB BioVentures. The Reporting Person is a manager of MPM Investors, AM LLC and BioVentures LLC.

Page 10 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

Luke Evnin
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  United States
       
  5   SOLE VOTING POWER
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   3,321,534*
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    3,321,534*
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  3,321,534*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  5.0%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  IN
*The shares are held as follows: 2,949,488 by BB BioVentures, 256,519 by MPM Parallel, 37,299 by MPM Investors and 78,228 by AM LLC. MPM BioVentures I, L.P. and BioVentures LLC are the direct and indirect general partners of MPM Parallel. BAB BV, BAB BioVentures NV and BioVentures LLC are the direct and indirect general partners of BB BioVentures. The Reporting Person is a manager of MPM Investors, AM LLC and BioVentures LLC.

Page 11 of 20


 

                     
CUSIP No.
 
45166R 20 4 
 

 

           
1   NAME OF REPORTING PERSONS
I.R.S. Identification No(s). of above person(s) (entities only)

Michael Steinmetz
     
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

  (a)    o
  (b)    þ
     
3   SEC USE ONLY
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION
   
  United States
       
  5   SOLE VOTING POWER
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER
BENEFICIALLY    
OWNED BY   3,243,306*
       
EACH 7   SOLE DISPOSITIVE POWER
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER
     
    3,243,306*
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
  3,243,306*
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
  4.9%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
  IN
*The shares are held as follows: 2,949,488 by BB BioVentures, 256,519 by MPM Parallel and 37,299 by MPM Investors. MPM BioVentures I, L.P. and BioVentures LLC are the direct and indirect general partners of MPM Parallel. BAB BV, BAB BioVentures NV and BioVentures LLC are the direct and indirect general partners of BB BioVentures. The Reporting Person is a manager of MPM Investors and BioVentures LLC.

Page 12 of 20

 


 

Item 1.
  (a)   Name of Issuer
 
      Idenix Pharmaceuticals, Inc.
  (b)   Address of Issuer’s Principal Executive Offices
 
      60 Hampshire Street
      Cambridge, MA 02139
Item 2.
  (a)   Name of Person Filing
BB BioVentures, L.P.
MPM BioVentures Parallel Fund, L.P.
MPM Asset Management Investors 1998 LLC
MPM Asset Management LLC
MPM BioVentures I, L.P.
MPM BioVentures I LLC
BAB BioVentures L.P.
BAB BioVentures, N.V.
Ansbert Gadicke
Luke Evnin
Michael Steinmetz
  (b)   Address of Principal Business Office or, if none, Residence
c/o MPM Capital L.P.
The John Hancock Tower
200 Clarendon Street, 54 th Floor
Boston, MA 02116
  (c)   Citizenship
     All entities were organized in Delaware, except BAB BioVentures, N.V which is organized in the Netherlands Antilles, and all individuals are United States citizens.
  (d)   Title of Class of Securities
     Common Stock
  (e)   CUSIP Number
      45166R 20 4
Item 3.   If this statement is filed pursuant to §§240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:
     Not applicable

Page 13 of 20


 

Item 4.   Ownership
  (a)   Amount Beneficially Owned:
         
BB BioVentures, LP
    2,949,488  
MPM BioVentures Parallel Fund, LP
    256,519  
MPM Asset Management Investors 1998 LLC
    37,299  
MPM Asset Management LLC
    78,228  
MPM BioVentures I, L.P.
    256,519 (1)
MPM BioVentures I LLC
    3,206,007 (2)
BAB BioVentures L.P.
    2,949,488 (3)
BAB BioVentures, N.V.
    2,949,488 (4)
Ansbert Gadicke
    3,321,534 (5)
Luke Evnin
    3,321,534 (5)
Michael Steinmetz
    3,243,306 (6)
  (b)   Percent of Class:
         
BB BioVentures, LP
    4.5 %
MPM BioVentures Parallel Fund, LP
    0.4 %
MPM Asset Management Investors 1998 LLC
    0.1 %
MPM Asset Management LLC
    0.1 %
MPM BioVentures I, L.P.
    0.4 %
MPM BioVentures I LLC
    4.8 %
BAB BioVentures L.P.
    4.5 %
BAB BioVentures, N.V.
    4.5 %
Ansbert Gadicke
    5.0 %
Luke Evnin
    5.0 %
Michael Steinmetz
    4.9 %
  (c)   Number of shares as to which the person has:
  (i)   Sole power to vote or to direct the vote
         
BB BioVentures, LP
    2,949,488  
MPM BioVentures Parallel Fund, LP
    256,519  
MPM Asset Management Investors 1998 LLC
    37,299  
MPM Asset Management LLC
    78,228  
MPM BioVentures I, L.P.
    0  

Page 14 of 20


 

         
MPM BioVentures I LLC
    0  
BAB BioVentures L.P.
    0  
BAB BioVentures, N.V.
    0  
Ansbert Gadicke
    0  
Luke Evnin
    0  
Michael Steinmetz
    0  
  (ii)   Shared power to vote or to direct the vote
         
BB BioVentures, LP
    0  
MPM BioVentures Parallel Fund, LP
    0  
MPM Asset Management Investors 1998 LLC
    0  
MPM Asset Management LLC
    0  
MPM BioVentures I, L.P.
    256,519 (1)
MPM BioVentures I LLC
    3,206,007 (2)
BAB BioVentures L.P.
    2,949,488 (3)
BAB BioVentures, N.V.
    2,949,488 (4)
Ansbert Gadicke
    3,321,534 (5)
Luke Evnin
    3,321,534 (5)
Michael Steinmetz
    3,243,306 (6)
  (iii)   Sole power to dispose or to direct the disposition of
         
BB BioVentures, LP
    2,949,488  
MPM BioVentures Parallel Fund, LP
    256,519  
MPM Asset Management Investors 1998 LLC
    37,299  
MPM Asset Management LLC
    78,228  
MPM BioVentures I, L.P.
    0  
MPM BioVentures I LLC
    0  
BAB BioVentures L.P.
    0  
BAB BioVentures, N.V.
    0  
Ansbert Gadicke
    0  
Luke Evnin
    0  
Michael Steinmetz
    0  
  (iv)   Shared power to dispose or to direct the disposition of
         
BB BioVentures, LP
    0  
MPM BioVentures Parallel Fund, LP
    0  
MPM Asset Management Investors 1998 LLC
    0  
MPM Asset Management LLC
    0  

Page 15 of 20


 

         
MPM BioVentures I, L.P.
    256,519 (1)
MPM BioVentures I LLC
    3,206,007 (2)
BAB BioVentures L.P.
    2,949,488 (3)
BAB BioVentures, N.V.
    2,949,488 (4)
Ansbert Gadicke
    3,321,534 (5)
Luke Evnin
    3,321,534 (5)
Michael Steinmetz
    3,243,306 (6)
 
(1)   The shares are held by MPM BioVentures Parallel Fund, L.P. (“MPM Parallel”), of which the Reporting Person is its general partner.
 
(2)   The shares are held as follows: 256,519 by MPM Parallel and 2,949,488 by BB BioVentures, L.P. (“BB BioVentures”). The Reporting Person is the indirect general partner of MPM Parallel and BB BioVentures.
 
(3)   The shares are held by BB BioVentures, of which the Reporting Person is the direct general partner.
 
(4)   The shares are held by BB BioVentures, of which the Reporting Person is the indirect general partner.
 
(5)   The shares are held as follows: 2,949,488 by BB BioVentures, 256,519 by MPM Parallel, 37,299 by MPM Asset Management Investors 1998 LLC (“MPM Investors”) and 78,228 by MPM Asset Management LLC (“AM LLC”). MPM BioVentures I, L.P. and MPM BioVentures I LLC (“BioVentures LLC”) are the direct and indirect general partners of MPM Parallel. BAB BioVentures L.P. (“BAB BV”), BAB BioVentures NV and BioVentures LLC are the direct and indirect general partners of BB BioVentures. The Reporting Person is a manager of MPM Investors, AM LLC and BioVentures LLC.
 
(6)   The shares are held as follows: 2,949,488 by BB BioVentures, 256,519 by MPM Parallel and 37,299 by MPM Investors. MPM BioVentures I, L.P. and BioVentures LLC are the direct and indirect general partners of MPM Parallel. BAB BV, BAB BioVentures NV and BioVentures LLC are the direct and indirect general partners of BB BioVentures. The Reporting Person is a manager of MPM Investors and BioVentures LLC.
Item 5.   Ownership of Five Percent or Less of a Class
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following þ .
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 or Control Person.
     Not Applicable
Item 8.   Identification and Classification of Members of the Group
     Not Applicable
Item 9.   Notice of Dissolution of a Group
     Not Applicable
Item 10.   Certification
     Not Applicable

Page 16 of 20


 

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.
Dated: February 11, 2010
                     
BB BIOVENTURES L.P.       MPM BIOVENTURES PARALLEL FUND, L.P.    
 
                   
By:
  BAB BioVentures L.P.,       By:   MPM BioVentures I LP,    
 
  its General Partner           its General Partner    
 
                   
By:
  BAB BioVentures N.V.,       By:   MPM BioVentures I LLC,    
 
  its General Partner           its General Partner    
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
 
                   
MPM ASSET MANAGEMENT INVESTORS 1998 LLC       MPM ASSET MANAGEMENT LLC    
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
 
                   
MPM BIOVENTURES I, L.P.       MPM BIOVENTURES I LLC    
 
                   
By:
  MPM BioVentures I LLC,                
 
  its General Partner                
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
 
                   
BAB BIOVENTURES, L.P.       BAB BIOVENTURES, N.V.    
 
                   
By:
  BAB BioVentures, N.V.                
 
  its General Partner                
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    

Page 17 of 20


 

     
/s/ Ansbert Gadicke
 
Ansbert Gadicke
   
 
   
/s/ Luke B. Evnin
 
Luke B. Evnin
   
 
   
/s/ Michael Steinmetz
 
Michael Steinmetz
   

Page 18 of 20


 

EXHIBIT A
JOINT FILING AGREEMENT
     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Idenix Pharmaceuticals, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to the agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this joint filing agreement may be signed in counterparts.
     In evidence whereof, the undersigned have caused this Agreement to be executed on their behalf this 11 th day of February, 2010.
                     
BB BIOVENTURES L.P.       MPM BIOVENTURES PARALLEL FUND, L.P.    
 
                   
By:
  BAB BioVentures L.P.,       By:   MPM BioVentures I LP,    
 
  its General Partner           its General Partner    
 
                   
By:
  BAB BioVentures N.V.,       By:   MPM BioVentures I LLC,    
 
  its General Partner           its General Partner    
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
 
                   
MPM ASSET MANAGEMENT INVESTORS 1998 LLC       MPM ASSET MANAGEMENT LLC    
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
 
                   
MPM BIOVENTURES I, L.P.       MPM BIOVENTURES I LLC    
 
                   
By:
  MPM BioVentures I LLC,                
 
  its General Partner                
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    

Page 19 of 20


 

                     
BAB BIOVENTURES, L.P.       BAB BIOVENTURES, N.V.    
 
                   
By: BAB BioVentures, N.V.
        its General Partner
               
 
                   
By:
  /s/ Luke B. Evnin
 
Name: Luke B. Evnin
      By:   /s/ Luke B. Evnin
 
Name: Luke B. Evnin
   
 
  Title: Manager           Title: Manager    
     
/s/ Ansbert Gadicke
 
Ansbert Gadicke
   
 
   
/s/ Luke B. Evnin
 
Luke B. Evnin
   
 
   
/s/ Michael Steinmetz
 
Michael Steinmetz
   

Page 20 of 20

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