State Street Institutional Investment Trust

03/18/2026 | Press release | Distributed by Public on 03/18/2026 09:03

Prospectus Certification by Investment Company (Form 497J)

State Street Institutional Investment Trust

One Congress Street

Boston, MA 02114

March 18, 2026

VIA EDGAR

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: Office of Filings, Information & Consumer Service
Re:

State Street Institutional Investment Trust (the "Trust")

File Nos.: 811-09819 and 333-30810

Dear Sir or Madam:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, we are transmitting for filing via EDGAR on behalf of the Trust this letter as certification that the Prospectus and Statement of Additional Information for the Trust, dated March 13, 2026, do not differ from those contained in the Post-Effective Amendment No. 326 to the Trust's Registration Statement on Form N-1A that was filed electronically via EDGAR on March 13, 2026 (Accession #0001193125-26-104485).

If you have any questions, please contact me at (617) 664-6507.

Very truly yours,

/s/ Edmund Gerard Maiorana, Jr.

Edmund Gerard Maiorana, Jr.
Assistant Secretary
State Street Institutional Investment Trust published this content on March 18, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on March 18, 2026 at 15:03 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]