Arrowhead Research Corporation to Report Second Quarter 2009 Financial Results and Host Conference Call on Friday, May 15th

PASADENA, Calif.--(Business Wire)--
Arrowhead Research Corporation (NASDAQ:ARWR) will report its financial results
for the second quarter of fiscal 2009 ended March 31, 2009 on Friday, May 15,
2009. The Company will also conduct a conference call at 9:00 a.m. ET (6:00 a.m.
PT) that day. To participate in the conference call, please dial 888-846-5003 or
480-629-9856. Investors may also access a live audio webcast of this conference
call on the Company's website at www.arrowheadresearch.com.

A replay of the webcast will be available approximately two hours after the
conclusion of the call. The webcast replay will remain available for 90 days. An
audio replay will also be available approximately two hours after the conclusion
of the call and will be made available until Friday, May 22, 2009. The audio
replay can be accessed by dialing 800-406-7325 or 303-590-3030 and entering
passcode 4070939#.

About Arrowhead Research Corporation

Arrowhead Research Corporation (www.arrowheadresearch.com) (NASDAQ:ARWR) is a
nanotechnology company commercializing new technologies in the areas of life
sciences, electronics, and energy. Arrowhead is seeking to build value for
shareholders through the progress of majority owned subsidiaries. Currently,
Arrowhead has four subsidiaries commercializing nanotech products and
applications and minority investments in two privately held nanobiotech
companies.

Investor Relations Contact:
The Piacente Group
Sanjay M. Hurry, 212-481-2050
sanjay@tpg-ir.com

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