Warner Mark Andrew plan to sell securities of SEI INVESTMENTS CO under Form 144

Warner Mark Andrew filed Form 144 to notify SEC of plan to sell 4000 units of SEI INVESTMENTS CO securities around 2026-04-28, with aggregate market value of $364,640.00. The total outstanding units is 120272976.0. The amount planned to be sold represents 0.00% of total outstanding units; Recent transactions in past 3 months include: On 02/25/2026, sold 4000 units for $326964.00;