SEC Info - Sei Institutional Investments Trust, et al.

As filed with the Securities and Exchange Commission on January 13, 2015

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-1A

  REGISTRATION STATEMENT UNDER THE
  SECURITIES ACT OF 1933
  POST-EFFECTIVE AMENDMENT NO. 86   x
  and
  REGISTRATION STATEMENT UNDER THE
  INVESTMENT COMPANY ACT OF 1940
  AMENDMENT NO. 87   x

SEI INSTITUTIONAL INVESTMENTS 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

Timothy D. Barto
SEI Investments Company
One Freedom Valley Drive
Oaks, Pennsylvania 19456
(Name and Address of Agent for Service)

Copy to:

Timothy W. Levin, Esquire
Morgan, Lewis & Bockius LLP
1701 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):

  o  immediately upon filing pursuant to paragraph (b)
  x  on February 12, 2015 pursuant to paragraph (b)
  o  60 days after filing pursuant to paragraph (a)(1) of Rule 485
  o  on [date] pursuant to paragraph (a)(1) of Rule 485
  o  75 days after filing pursuant to paragraph (a)(2) of Rule 485
  o  on [date] pursuant to paragraph (a)(2) of Rule 485.

If appropriate check the following box:

x This post-effective Amendment designates a new effective date for a previously filed post-effective Amendment.

EXPLANATORY NOTE

This Post-Effective Amendment No. 86 to the Registration Statement on Form N-1A for SEI Institutional Investments Trust (the "Trust") is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act of 1933, as amended (the "1933 Act") solely for the purpose of delaying, until February 12, 2015, the effectiveness of Post-Effective Amendment No. 85 ("PEA No. 85"), which was filed with the Commission via EDGAR Accession No. 0001104659-14-075590 on October 31, 2014, pursuant to paragraph (a)(2) of Rule 485 under the 1933 Act. Since no other changes are intended to be made to PEA No. 85 by means of this filing, Parts A, B and C of PEA No. 85 are incorporated herein by reference.

PART A—PROSPECTUS

The Prospectus for the Trust's Intermediate Duration Corporate Bond Fund is incorporated herein by reference to Part A of PEA No. 85.

PART B—STATEMENT OF ADDITIONAL INFORMATION

The Statement of Additional Information for the Trust's Intermediate Duration Corporate Bond Fund is incorporated herein by reference to Part B of PEA No. 85.

PART C—OTHER INFORMATION

The Part C for the Trust's Intermediate Duration Corporate Bond Fund is incorporated herein by reference to the Part C of PEA No. 85.

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. 86 to Registration Statement No. 033-58041 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Oaks, Commonwealth of Pennsylvania on the 13th day of January, 2015.

SEI INSTITUTIONAL INVESTMENTS 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.

*
William M. Doran

Trustee

January 13, 2015

*
George J. Sullivan, Jr.

Trustee

January 13, 2015

*
Nina Lesavoy

Trustee

January 13, 2015

*
James M. Williams

Trustee

January 13, 2015