UNITED STATES SECURITIES AND EXCHANGE COMMISSION Commission File Number: 0-10200 ________________________________________ ________________________________________ SEI INVESTMENTS COMPANY (Exact name of Registrant as Specified in Its Charter) Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the tran ...