BlackRock, Inc. filed Amendment No. 12 to Schedule 13G with the SEC on October 27, 2026, disclosing its beneficial ownership position in SEI Investments Company as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: BlackRock reported 9,446,264 shares of SEI Investments Company common stock beneficially owned.
  • Percent of class: The reported position represents 7.9% of the outstanding common shares.
  • Sole voting power: BlackRock disclosed sole voting power over 9,177,477 shares.
  • Sole dispositive power: BlackRock reported sole dispositive power over all 9,446,264 shares.
  • Shared voting and dispositive power: Both shared voting power and shared dispositive power are reported as 0.
  • Event date: The date of the event requiring the filing was September 30, 2026.
  • No single person holds more than 5%: According to the filing, "no one person's interest in the common stock of SEI Investments Company is more than five percent of the total outstanding common shares."

BlackRock's Amendment No. 12 Schedule 13G for SEI Investments Common Stock

BlackRock, Inc., organized in Delaware and headquartered at 50 Hudson Yards, New York, NY 10001, filed Amendment No. 12 to Schedule 13G on October 27, 2026, covering its beneficial ownership of common stock in SEI Investments Company (CUSIP 784117103), whose principal executive offices are located at 1 Freedom Valley Drive, Oaks, PA 19456-1100. The filing was signed by Spencer Fleming, Managing Director, on behalf of BlackRock.

According to the filing, the Schedule 13G reflects securities "beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the 'Reporting Business Units') of BlackRock, Inc. and its subsidiaries and affiliates." The filing notes that it does not include securities, if any, beneficially owned by other business units whose beneficial ownership is disaggregated in accordance with SEC Release No. 34-39538 dated January 12, 1998. BlackRock is classified as a parent holding company (type "HC") in the filing.

The filing further states that various persons have the right to receive, or the power to direct the receipt of, dividends from or proceeds from the sale of the common stock of SEI Investments Company, but that no single person's interest exceeds five percent of total outstanding common shares. BlackRock certified that the securities were "acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." Subsidiaries responsible for the reported holdings are identified in Exhibit 99 attached to the filing.

What Was Disclosed

BlackRock, Inc. disclosed in Amendment No. 12 to Schedule 13G that, as of September 30, 2026, it beneficially owned 9,446,264 shares of SEI Investments Company common stock, representing 7.9% of the class, with sole voting power over 9,177,477 shares and sole dispositive power over all 9,446,264 shares.