As filed with the U.S. Securities and Exchange Commission on August 9, 2018

File No. 033-64875
File No. 811-07445

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE
SECURITIES ACT OF 1933

POST-EFFECTIVE AMENDMENT NO. 41 x

and

REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 42 x

SEI ASSET ALLOCATION TRUST

(Exact Name of Registrant as Specified in Charter)

SEI Investments Company

One Freedom Valley Drive
Oaks, Pennsylvania 19456

(Address of Principal Executive Offices)

(610) 676-1000

(Registrant’s Telephone Number)

Timothy D. Barto, Esq.

SEI Investments Company
One Freedom Valley Drive
Oaks, Pennsylvania 19456

(Name and Address of Agent for Service)

Copy to:

Timothy W. Levin, Esq.
Morgan, Lewis & Bockius LLP
101 Market Street
Philadelphia, Pennsylvania 19103

Title of Securities Being Registered...Units of Beneficial Interest

It is proposed that this filing will become effective (check appropriate box)

x immediately upon filing pursuant to paragraph (b)

o on [date] pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(1)

o on [date] pursuant to paragraph (a)(1)

o 75 days after filing pursuant to paragraph (a)(2)

o on [date] pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

o This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment No. 41 to Registration Statement No. 033-64875 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Oaks, Commonwealth of Pennsylvania on the 9th day of August, 2018.

SEI ASSET ALLOCATION TRUST
By:	/s/ Robert A. Nesher
Robert A. Nesher
Trustee, President & Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, as amended, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date(s) indicated.

*	Trustee	August 9, 2018
William M. Doran
*	Trustee	August 9, 2018
George J. Sullivan, Jr.
*	Trustee	August 9, 2018
Nina Lesavoy
*	Trustee	August 9, 2018
James M. Williams
*	Trustee	August 9, 2018
Mitchell A. Johnson
*	Trustee	August 9, 2018
Hubert L. Harris, Jr.
*	Trustee	August 9, 2018
Susan C. Cote
*	Trustee	August 9, 2018
James B. Taylor
/s/ Robert A. Nesher	Trustee, President & Chief Executive Officer	August 9, 2018
Robert A. Nesher
/s/ James Hoffmayer	Controller & Chief Financial Officer	August 9, 2018
James Hoffmayer

*By:	/s/ Robert A. Nesher
	Robert A. Nesher
	Attorney-in-Fact

INDEX TO EXHIBITS

EXHIBIT NO.	DESCRIPTION OF EXHIBIT	PAGE NO.
	Risk/return summary of the Funds’ prospectuses as an Interactive Data File using eXtensible Business Reporting Language (“XBRL”)