144 0001059374 XXXXXXXX LIVE 0000350894 SEI Investments Company 000-10200 1 Freedom Valley Drive Oaks PA 19456 610-676-1000 Alfred P. West, Jr. Affiliate Common Stock J.P. Morgan Securities LLC 270 Park Avenue, 10th Floor New York NY 10017 59000 5187870 120272976 06/26/2026 NASDAQ Common Stock 11/01/2019 Private Transaction Issuer N 59000 11/01/2019 N/A Y 06/26/2026 J.P. Morgan Securities LLC as agent and attorney-in-fact for Alfred P. West, Jr.