X0203 3 2010-11-23 0 0001411158 Anacor Pharmaceuticals Inc ANAC 0001277997 VENROCK ASSOCIATES IV L P C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001305239 Venrock Partners, L.P. C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001277994 VENROCK ENTREPRENEURS FUND IV L P C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001305238 Venrock Management IV, LLC C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001305240 Venrock Partners Management, LLC C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001305243 VEF Management IV, LLC C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 Series C Convertible Preferred Stock Common Stock 1752808 I By Fund Series D Convertible Preferred Stock Common Stock 133622 I By Fund Series E Convertible Preferred Stock Common Stock 139105 I By Fund The Issuer's Series C Convertible Preferred Stock, Series D Convertible Preferred Stock and Series E Convertible Preferred Stock will automatically convert into the Issuer's Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering and have no expiration date. Consists of 1,426,786 shares held by Venrock Associates IV, L.P. ("VAIV"), 290,966 shares held by Venrock Partners, L.P. ("VP") and 35,056 shares held by Venrock Entrepreneurs Fund IV, L.P. ("VEFIV"). Venrock Management IV, LLC, Venrock Partners Management, LLC and VEF Management IV, LLC (together, the "Venrock GP Entities") are the sole general partners of VAIV, VP and VEFIV, respectively (together, the "Venrock Funds"), and have voting and investment power over the shares held by the Venrock Funds. Anders D. Hove is a Member of each of the Venrock GP Entities, and each of Dr. Hove and the Venrock GP Entities disclaims beneficial ownership of the shares held by the Venrock Funds, except to the extent of their respective indirect pecuniary interests therein. Consists of 108,769 shares held by VAIV, 22,181 shares held by VP and 2,672 shares held by VEFIV. Venrock Management IV, LLC, Venrock Partners Management, LLC and VEF Management IV, LLC are the sole general partners of VAIV, VP and VEFIV, respectively, and have voting and investment power over the shares held by the Venrock Funds. Anders D. Hove is a Member of each of the Venrock GP Entities, and each of Dr. Hove and the Venrock GP Entities disclaims beneficial ownership of the shares held by the Venrock Funds, except to the extent of their respective indirect pecuniary interests therein. Consists of 113,232 shares held by VAIV, 23,091 shares held by VP and 2,782 shares held by VEFIV. Venrock Management IV, LLC, Venrock Partners Management, LLC and VEF Management IV, LLC are the sole general partners of VAIV, VP and VEFIV, respectively, and have voting and investment power over the shares held by the Venrock Funds. Anders D. Hove is a Member of each of the Venrock GP Entities, and each of Dr. Hove and the Venrock GP Entities disclaims beneficial ownership of the shares held by the Venrock Funds, except to the extent of their respective indirect pecuniary interests therein. /s/ David L. Stepp, authorized signatory 2010-11-23 /s/ David L. Stepp, authorized signatory 2010-11-23 /s/ David L. Stepp, authorized signatory 2010-11-23 /s/ David L. Stepp, authorized signatory 2010-11-23 /s/ David L. Stepp, authorized signatory 2010-11-23 /s/ David L. Stepp, authorized signatory 2010-11-23