X0508 4 2024-10-25 0000350894 SEI INVESTMENTS CO SEIC 0001745371 Peterson Michael 1 FREEDOM VALLEY DRIVE OAKS PA 19456 true EVP and General Counsel false Common Stock 2024-10-25 4 M 0 25000 55.73 A 31500 D Common Stock 2024-10-25 4 S 0 20438 74.49 D 11062 D Common Stock 2024-10-25 4 S 0 4562 75.04 D 6500 D Option to Purchase Common Stock 55.73 2024-10-25 4 M 0 25000 D 2022-06-18 2030-06-18 Common Stock 25000 0 D The price reported represents the weighted average of a range of sale prices from $74.00 to $74.99. 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. The price reported represents the weighted average of a range of sale prices from $75.00 to $75.18. 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. /s/ Michael Peterson by Diane Gallagher, attorney-in-fact 2024-10-28