FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

BAUPOST GROUP LLC/MA

2. Date of Event Requiring Statement (MM/DD/YYYY)
11/1/2013 

3. Issuer Name and Ticker or Trading Symbol

IDENIX PHARMACEUTICALS INC [IDIX]

(Last)        (First)        (Middle)

10 ST JAMES AVE, SUITE 1700

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            ___ X ___ 10% Owner
_____ Officer (give title below)          _____ Other (specify below)

(Street)

BOSTON, MA 02116       

(City)              (State)              (Zip)
5. If Amendment, Date Original Filed (MM/DD/YYYY)

 

6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person


Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4) 		2. Amount of Securities Beneficially Owned
(Instr. 4) 		3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5) 		4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Idenix Pharmaceuticals, inc.   36910868   I   See footnote 1.   (1)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4) 		2. Date Exercisable and Expiration Date
(MM/DD/YYYY) 		3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4) 		4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5) 		6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
( 1)  This statement on Form 3 is being jointly filed by The Baupost Group, L.L.C. ("Baupost"), Baupost Value Partners, L.P. - IV ("BVPIV"), SAK Corporation and Seth A. Klarman. Baupost is a registered investment adviser and acts as an investment adviser and general partner to certain investment limited partnerships, including BVPIV. SAK Corporation is the Manager of Baupost. Mr. Klarman, as the sole director and sole officer of SAK Corporation and a controlling person of Baupost, may be deemed to have beneficial ownership under Section 13(d) of the Securities Exchange Act of 1934 of the securities beneficially owned by Baupost. Securities reported on this statement on Form 3 as being beneficially owned by Baupost include securities purchased on behalf of various investment limited partnerships, including BVPIV.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BAUPOST GROUP LLC/MA
10 ST JAMES AVE
SUITE 1700
BOSTON, MA 02116
X

BAUPOST VALUE PARTNERS LP IV
10 ST. JAMES AVE.
SUITE 1700
BOSTON, MA 02116
X

SAK CORP
10 ST JAMES AVENUE
STE 1700
BOSTON, MA 02116
X

KLARMAN SETH A
10 ST. JAMES AVE.
SUITE 1700
BOSTON, MA 02116
X


Signatures
The Baupost Group, L.L.C. by Seth A. Klarman, President 11/1/2013
** Signature of Reporting Person Date

SAK Corporation, by Seth A. Klarman, President 11/1/2013
** Signature of Reporting Person Date

Seth A. Klarman 11/1/2013
** Signature of Reporting Person Date

Baupost Limited Partneship LP - IV by The Baupost Group, LLC Managing General Partner by Seth A. Klarman President 11/1/2013
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who 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.
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