EXHIBIT 31.1

CERTIFICATIONS

I, Ryan P. Hicke, certify that:

1. I have reviewed this Amendment No. 1 to Annual Report on Form 10-K of SEI Investments Company; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: February 22, 2024

/s/ Ryan P. Hicke

Ryan P. Hicke

Chief Executive Officer