EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 2-73997, No. 333-41343, No. 333-63709, No. 333-111224, No. 333-149549, No. 333-197598 and No. 333-281039) on Form S-8 of SEI Investments Company of our reports dated February 20, 2025, with respect to the consolidated financial statements of SEI Investments Company and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Philadelphia, Pennsylvania

February 20, 2025