X0508 4 2025-12-04 0000350894 SEI INVESTMENTS CO SEIC 0001964748 McCabe Philip ONE FREEDOM VALLEY DRIVE OAKS PA 19456 true See Remarks false Common Stock 2025-12-04 4 M 0 12000 53.34 A 74544.45 D Common Stock 2025-12-04 4 S 0 12000 81.11 D 62544.45 D Common Stock 2441.6634 I By Employee Stock Purchase Plan Option to Purchase Common Stock 53.34 2025-12-04 4 M 0 12000 D 2018-12-31 2025-12-08 Common Stock 12000 0 D Represents the weighted average of a range of sale prices from $80.87 to $81.57. The reporting person undertakes to provide to the Staff of the Securities and Exchange Commission, the Company, or any stockholder of the Company, upon request, full information regarding the number of shares sold at each separate price. Received as employment compensation. Executive Vice President and Head of SEI's Investment Management Business. /s/ Philip McCabe by Diane Gallagher, attorney in fact 2025-12-08