X0206 3/A 2020-03-11 2020-03-13 0 0000350894 SEI INVESTMENTS CO SEIC 0001799975 Hicke Ryan ONE FREEDOM VALLEY DRIVE OAKS PA 19456 0 1 0 0 Executive Vice President COMMON STOCK 6812 I These shares are held in a 401(k) COMMON STOCK 1171 I These shares are held in the Employee Stock Purchase Plan These shares were mistakenly not added to the original Form 3. RUTH MONTGOMERY (Attorney in Fact) 2020-03-13