Filed with the Securities and Exchange Commission on September 10, 2012

1933 Act Registration File No. 333-17391

1940 Act File No. 811-07959

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No. ____	¨
Post-Effective Amendment No. 451	x
and
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 453	x

(Check appropriate box or boxes.)

ADVISORS SERIES TRUST

(Exact Name of Registrant as Specified in Charter)

615 East Michigan Street

Milwaukee, Wisconsin  53202

(Address of Principal Executive Offices) (Zip Code)

(Registrant’s Telephone Numbers, Including Area Code) (414) 765-6609

Douglas G. Hess, President

Advisors Series Trust

c/o U.S. Bancorp Fund Services, LLC

777 East Wisconsin Avenue, 5th Floor

Milwaukee, Wisconsin 53202

(Name and Address of Agent for Service)

Copies to:

Domenick Pugliese, Esq.

Paul Hastings LLP

75 East 55th Street

New York, New York 10022

It is proposed that this filing will become effective

ý	immediately upon filing pursuant to paragraph (b)
o	on __________ pursuant to paragraph (b)
o	60 days after filing pursuant to paragraph (a)(1)
o	on __________ pursuant to paragraph (a)(1)
o	75 days after filing pursuant to paragraph (a)(2)
o	on __________ pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box

[  ] this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Explanatory Note: This Post-Effective Amendment (“PEA”) No. 451 to the Advisors Series Trust’s (the “Trust”) Registration Statement on Form N-1A hereby incorporates Parts A, B and C from the Trust’s PEA No. 449 on Form N-1A filed August 24, 2012.  This PEA No. 451 is filed for the sole purpose of submitting the XBRL exhibit for the risk return summary first provided in PEA No. 449 to the Trust’s Registration Statement with respect to the Trust’s series: the SiM Dynamic Allocation Diversified Income Fund and the SiM Dynamic Allocation Equity Income Fund.

SIGNATURES

Pursuant to the requirements of the Securities Act and the 1940 Act, the Registrant certifies that this Post-Effective Amendment No. 451 to its Registration Statement meets all of the requirements for effectiveness pursuant to Rule 485(b) of the Securities Act and the Registrant has duly caused this Post-Effective Amendment No. 451 to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, duly authorized, in the City of Milwaukee and State of Wisconsin, on the 10th day of September, 2012.

Advisors Series Trust

By: /s/ Douglas G. Hess

             Douglas G. Hess

             President

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment No. 451 to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
Sallie P. Diederich*	Trustee	September 10, 2012
Sallie P. Diederich
Donald E. O’Connor*	Trustee	September 10, 2012
Donald E. O’Connor
George Rebhan*	Trustee	September 10, 2012
George Rebhan
George T. Wofford*	Trustee	September 10, 2012
George T. Wofford
Joe D. Redwine*	Trustee, Chairman and	September 10, 2012
Joe D. Redwine	Chief Executive Officer
/s/ Cheryl L. King	Treasurer and	September 10, 2012
Cheryl L. King	Principal Financial Officer
/s/ Douglas G. Hess	President and	September 10, 2012
Douglas G. Hess	Principal Executive Officer
*By: /s/ Douglas G. Hess		September 10, 2012
Douglas G. Hess                Attorney-In Fact pursuant to                Power of Attorney

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EXHIBIT LIST

Exhibit	Exhibit No.
Instance Document	EX-101.INS
Schema Document	EX-101.SCH
Calculation Linkbase Document	EX-101.CAL
Definition Linkbase Document	EX-101.DEF
Label Linkbase Document	EX-101.LAB
Presentation Linkbase Document	EX-101.PRE

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