X0202 3 2008-02-22 0 0001093649 IDENIX PHARMACEUTICALS INC IDIX 0001428086 Fanning Paul C/O IDENIX PHARMACEUTICALS, INC. 60 HAMPSHIRE STREET CAMBRIDGE MA 02139 0 1 0 0 SVP, Human Resources Common Stock 1333 D Employee Stock Option (Right to Buy) 12.05 2014-03-01 Common Stock 55000 D Employee Stock Option (Right to Buy) 19.14 2015-02-27 Common Stock 15000 D Employee Stock Option (Right to Buy) 21.11 2016-03-06 Common Stock 15000 D Employee Stock Option (Right to Buy) 8.12 2017-03-05 Common Stock 15000 D Employee Stock Option (Right to Buy) 2.41 2017-11-08 Common Stock 30000 D This option vests in 48 equal monthly installments beginning on March 31, 2004. This option vests in 48 equal monthly installments beginning on March 31, 2005. This option vests in 48 equal monthly installments beginning on March 31, 2006. This option vests in 48 equal monthly installments beginning on March 31, 2007. This option vests in 48 equal monthly installments beginning on November 30, 2007. /s/Maria Stahl as Attorney-in-Fact for Paul Fanning 2008-02-25