ARROWHEAD PHARMACEUTICALS, INC. Stock Agreements

FORM OF SERIES A PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on May 12, 2011)

STOCK PURCHASE AGREEMENT (Filed With SEC on May 12, 2011)

STOCK PURCHASE AGREEMENT (Filed With SEC on January 21, 2011)

UNIDYM, INC. SERIES D PREFERRED STOCK PURCHASE AGREEMENT SERIES D PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on July 2, 2010)

UNIDYM, INC. SUBSCRIPTION AGREEMENT SERIES C-1 PREFERRED STOCK SUBSCRIPTION AGREEMENT (Filed With SEC on August 10, 2009)

SUBSCRIPTIONAGREEMENT SERIES C-1 PREFERRED STOCK SUBSCRIPTION AGREEMENT (Filed With SEC on May 15, 2009)

UNIDYM, INC. SUBSCRIPTION AGREEMENT SERIES C-1 PREFERRED STOCK SUBSCRIPTION AGREEMENT (Filed With SEC on December 15, 2008)

STOCK PURCHASE AGREEMENT BETWEEN ARROWHEAD RESEARCH AND (Filed With SEC on November 28, 2008)

SERIES B PREFERRED STOCK PURCHASE AGREEMENT SERIES B PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on July 25, 2008)

UNIDYM, INC. SUBSCRIPTION AGREEMENT SERIES C PREFERRED STOCK SUBSCRIPTION AGREEMENT (Filed With SEC on June 18, 2008)

ARROWHEAD RESEARCH CORPORATION Stock OptionAgreement (Filed With SEC on June 13, 2008)

AONEX TECHNOLOGIES SERIES B PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on May 9, 2008)

UNIDYM, INC. SUBSCRIPTION AGREEMENT SERIES C PREFERRED STOCK (Filed With SEC on February 11, 2008)

Tego BioSciences Corporation SERIES A-2 PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on October 30, 2007)

STOCK PURCHASE AGREEMENT (Filed With SEC on April 25, 2007)

NANOPOLARIS, INC. SERIES A PREFERRED STOCK PURCHASEAGREEMENT June 13, 2006 TABLE OF CONTENTS (Filed With SEC on June 16, 2006)

CALANDO PHARMACEUTICALS INC. SERIES A PREFERRED STOCK PURCHASE AGREEMENT (Filed With SEC on April 6, 2006)

SERIES C PREFERRED STOCK PURCHASE AGREEMENT BETWEEN (Filed With SEC on April 6, 2005)

STOCK PURCHASE AGREEMENT (Filed With SEC on March 1, 2005)