X0609 4 2026-09-22 0000350894 SEI INVESTMENTS CO SEIC 0002037087 LANE MICHAEL false ONE FREEDOM VALLEY DRIVE OAKS PA 19456 true Executive Vice President false Common Stock 2026-09-22 4 S 0 2400 102.78 D 39581 D Common Stock 330 I By Employee Stock Purchase Plan Represents the weighted average of a range of sale prices from $102.76 to $102.79. 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. Reflects the addition of approximately 125 shares purchased by the reporting person through the Company's Employee Stock Purchase Plan. /s/ Michael Lane by Lindsay A. Barci, attorney in fact 2026-09-24