Arrowhead Research Set to Join Russell 3000 Index

PASADENA, Calif.–(BUSINESS WIRE)–

Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical

company developing targeted RNAi therapeutics, is set to join the

broad-market Russell 3000 Index when Russell Investments reconstitutes

its comprehensive set of U.S. and global equity indexes on June 27,

according to a preliminary list of additions posted June 13 on www.russell.com/indexes.

Annual reconstitution of Russell’s U.S. indexes captures the 4,000

largest U.S. stocks as of the end of May, ranking them by total market

capitalization. Membership in the Russell 3000, which remains in place

for one year, means automatic inclusion in the large-cap Russell 1000

Index or small-cap Russell 2000 Index as well as the appropriate growth

and value style indexes. Russell determines membership for its equity

indexes primarily by objective, market-capitalization rankings and style

attributes. The Russell 3000 also serves as the U.S. component to the

Russell Global Index, which Russell launched in 2007.

Russell indexes are widely used by investment managers and institutional

investors for index funds and as benchmarks for active investment

strategies. Approximately $5.2 trillion in assets are benchmarked to the

Russell Indexes. Russell calculates more than 700,000 benchmarks daily

covering approximately 98 percent of the investable market globally,

more than 80 countries and 10,000 securities.

About Arrowhead Research Corporation

Arrowhead Research Corporation is a biopharmaceutical company developing

targeted RNAi therapeutics. The company is leveraging its proprietary

drug delivery technologies to develop targeted drugs based on the RNA

interference mechanism that efficiently silences disease-causing genes.

Arrowhead technologies also enable partners to create peptide-drug

conjugates that specifically home to cell types of interest while

sparing off-target tissues. Arrowhead’s pipeline includes clinical

programs in chronic hepatitis B virus and partner-based programs in

obesity and oncology.

For more information please visit http://www.arrowheadresearch.com,

or follow us on Twitter @ArrowRes.

To be added to the Company’s email list to receive news directly, please

send an email to ir@arrowres.com.

Safe Harbor Statement under the Private Securities Litigation Reform

Act:

This news release contains forward-looking statements within the

meaning of the “safe harbor” provisions of the Private Securities

Litigation Reform Act of 1995. These statements are based upon our

current expectations and speak only as of the date hereof. Our actual

results may differ materially and adversely from those expressed in any

forward-looking statements as a result of various factors and

uncertainties, including our ability to finance our operations, the

future success of our scientific studies, our ability to successfully

develop drug candidates, the timing for starting and completing clinical

trials, rapid technological change in our markets, and the enforcement

of our intellectual property rights. Arrowhead Research Corporation’s

most recent Annual Report on Form 10-K and subsequent Quarterly Reports

on Form 10-Q discuss some of the important risk factors that may affect

our business, results of operations and financial condition. We assume

no obligation to update or revise forward-looking statements to reflect

new events or circumstances.

Arrowhead Research Corporation
Vince Anzalone, CFA
626-304-3400
ir@arrowres.com
or
Investor

Relations:
The Trout Group
Lauren Glaser
646-378-2972
ir@arrowres.com
or
Media:
Russo

Partners
Martina Schwarzkopf, Ph.D.
212-845-4292
martina.schwarzkopf@russopartnersllc.com

Source: Arrowhead Research Corporation

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