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Stockholders' Equity
 9 Months Ended
Jun. 30, 2011
Stockholders' Equity  
Stockholders' Equity

NOTE 5. STOCKHOLDERS' EQUITY

At June 30, 2011, the Company had a total of 150,000,000 shares of capital stock authorized for issuance, consisting of 145,000,000 shares of Common Stock, par value $0.001, and 5,000,000 shares of Preferred Stock, par value $0.001.

At June 30, 2011, 71,833,693 shares of Common Stock were outstanding. At June 30, 2011, 1,532,000 shares and 9,704,436 shares were reserved for issuance under Arrowhead's 2000 Stock Option Plan and 2004 Equity Incentive Plan, respectively.

On July 17, 2009 and August 6, 2009, the Company sold an aggregate of 9,196,642 units in a private placement transaction with institutional and accredited investors. Each unit consisted of one share of Arrowhead Common Stock and a warrant to purchase an additional share of Common Stock exercisable at $0.50 per share; the unit price was $0.30. The warrants became exercisable on January 18, 2010 and February 7, 2010, and remain exercisable until June 30, 2014. The warrants can be called for redemption by the Company as the redemption feature provided for in the warrants has been met. Gross proceeds of the offering totaled approximately $2.8 million.

On December 11, 2009, the Company sold an aggregate of 5,083,430 units in a private placement transaction with accredited investors. Each unit consisted of one share of Arrowhead Common Stock and a warrant to purchase an additional share of Common Stock exercisable at $0.509 per share. The unit price was $0.634, based upon the closing bid price on the Company's Common Stock on December 11, 2009, which was $0.509, plus $0.125 for the purchase of the warrant. The warrants became exercisable on June 12, 2010 and remain exercisable until December 11, 2014. The warrants can be called for redemption by the Company as the redemption feature provided for in the warrants has been met. Gross proceeds of the offering were approximately $3.2 million.

On June 17, 2010, the Company sold an aggregate of 6,592,989 units at a price of $1.312 per unit in a registered offering to institutional and individual investors. Each unit consisted of one share of Arrowhead Common Stock and a warrant to purchase 0.5 share of Common Stock exercisable at $1.65 per share. The warrants contain an antidilution provision which can result in an adjustment to the exercise price under certain circumstances (see Note 9 for additional information). Gross proceeds from the offering were $8.65 million before deducting placement agent commission and other offering expenses.

The following table summarizes information about warrants outstanding at June 30, 2011:

 

Exercise prices

    Number of Warrants      Remaining
Life in Years		  

$7.06

      948,969         5.9   

$2.00

      3,863,999         2.1   

$0.50

      11,630,335         3.4   

$0.51

      4,610,244         3.5   

$1.65

      3,296,497         4.5   
  

 

 

     

Total warrants outstanding

      24,350,044