SEI INVESTMENTS CO

On July 23, 2024, the Board of Directors of the Company approved an amendment to the SEI Investments Company Employee Stock Purchase Plan (the “Plan”), as amended and restated as of April 21, 2020, to permit participants in the Plan, under certain circumstances described in such amendment to the Plan, all of which would occur only following the termination of such participant’s employment with the Company, to sell the shares acquired through the Plan prior to the first anniversary of the offering date of such shares under the Plan. This summary of the amendment to the Plan does not purport to be complete and is qualified in its entirety by reference to the full text of such amendment, which is attached as Exhibit 10.3 to this Quarterly Report on Form 10-Q and is incorporated herein by reference.

During the three months ended June 30, 2024, none of our officers or directors adopted orterminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any "non-Rule 10b5-1 trading arrangement" (as defined in Item 408 (c) of Regulation S-K).