Form 8-K



Washington, D.C. 20549







Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934


Date of Report (Date of earliest event reported): June 15, 2005



Arrowhead Research Corporation

(Exact name of registrant as specified in its charter)



Delaware   0-21898   46-0408024

(State or other jurisdiction

of incorporation)

  (Commission File Number)  

(I.R.S. Employer

Identification No.)


1118 East Green Street, Pasadena, CA   91106
(Address of principal executive offices)   (Zip Code)


Registrant’s telephone number, including area code: (626) 792-5549


Not Applicable

(Former name or former address, if changed since last report)



Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):


¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))


Item 8.01. Other Events.


On June 16, 2005, Arrowhead Research Corporation (the “Company”) announced that its Warrant Redemption closed on Wednesday, June 15, 2005, as previously scheduled. Almost all of its outstanding redeemable warrants to purchase common stock were exercised prior to the exercise deadline of 4:00 PM PT on Tuesday, June 14, 2005. As a result of the warrant redemption, the Company received over $20 million in cash. Approximately $17.7 million was received as a result of the warrant call on May 4, 2005. An additional $2.4 million was received prior to the May 4, 2005 warrant call. The Company plans to use the cash received to fund the Company’s subsidiaries, the Company’s research projects and general working capital purposes.


As of the date of this filing, the Company has 27,837,066 shares of Common Stock outstanding. The Company’s press release announcing the Company’s Warrant Redemption is attached as Exhibit 99.1 to this report.


Item 9.01. Financial Statements and Exhibits.


  (c) Exhibits.


Exhibit No.



99.1   Press Release announcing the completion of the Company’s warrant redemption, dated June 16, 2005.



Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


Date: June 17, 2005



/s/ Joseph T. Kingsley

    Joseph T. Kingsley, Chief Financial Officer