Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No.__)

Filed by the Registrant

Filed by a Party other than the Registrant

Check the appropriate box:

    Preliminary Proxy Statement

    Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

    Definitive Proxy Statement

    Definitive Additional Materials

    Soliciting Material Pursuant to §240.14a-12

ARROWHEAD PHARMACEUTICALS, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

    No fee required.

    Fee paid previously with preliminary materials

    Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

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