X0609 4 2026-08-04 0000350894 SEI INVESTMENTS CO SEIC 0001964748 McCabe Philip false ONE FREEDOM VALLEY DRIVE OAKS PA 19456 true See Remarks false Common Stock 2026-08-04 4 M 0 9957 49.63 A 64841.45 D Common Stock 2026-08-04 4 M 0 15000 49.63 A 79841.45 D Common Stock 2026-08-04 4 S 0 24957 105.038 D 54884.45 D Common Stock 2026-08-05 4 M 0 5043 49.63 A 59927.45 D Common Stock 2026-08-05 4 S 0 5043 105.5 D 54884.45 D Common Stock 2738.9939 I By Employee Stock Purchase Plan Option to Purchase Common Stock 49.63 2026-08-04 4 M 0 9957 D 2019-12-31 2026-12-13 Common Stock 9957 5043 D Option to Purchase Common Stock 49.63 2026-08-04 4 M 0 15000 D 2017-12-31 2026-12-13 Common Stock 15000 0 D Option to Purchase Common Stock 49.63 2026-08-05 4 M 0 5043 D 2019-12-31 2026-12-13 Common Stock 5043 0 D Represents the weighted average of a range of sale prices from $104.80 to $105.19. 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. Title: Executive Vice President, Head of SEI's Investment Managers business /s/ Philip McCabe by Lindsay A. Barci, attorney in fact 2026-08-06