Prospectus by Investment Company (Form 497)

SEI INSTITUTIONAL INVESTMENTS TRUST

World Select Equity Fund
(the "Fund")

Supplement Dated December 16, 2024
to the Prospectus (the "Prospectus"), dated September 30, 2024, as amended on November 5,
2024 and the Statement of Additional Information (the "SAI"), dated
September 30, 2024, as amended on November 5, 2024

This Supplement provides new and additional information beyond that contained in the Prospectus and SAI and should be read in conjunction with such Prospectus and SAI.

The Prospectus and SAI are hereby amended and supplemented to reflect the following changes to the Fund.

Change in Portfolio Management of the Fund

Rhicon Currency Management PTE Ltd no longer serves as a sub-adviser to the Fund. As such, all references to Rhicon Currency Management PTE Ltd are hereby deleted from the Prospectus and SAI.

There are no other changes to the Prospectus or SAI

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

SEI-F-1575 (12/24)