Novartis AG — Director's Dealing 2009

May 29, 2009

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IDENIX PHARMACEUTICALS INC (IDIX)
CIK: 0001093649
Period of Report: 2009-05-29

Reporting Person: NOVARTIS AG (INDIRECT 10% OWNER)
Reporting Person: NOVARTIS PHARMA AG (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2009-05-29	Common Stock	P	2451	$2.62	Acquired	31317393	Indirect

Footnotes

F1: These securities are owned directly by Novartis Pharma AG, a direct, wholly-owned subsidiary of Novartis AG. Novartis AG is an indirect beneficial owner of these securities.