BlackRock Portfolio Management LLC filed an amended Schedule 13G with the SEC on October 27, 2026, disclosing beneficial ownership of 1,664,459 shares of Quantinuum Inc. Class A Stock as of September 30, 2026.

Key Highlights

  • Filer: BlackRock Portfolio Management LLC, organized in Delaware, with principal offices at 50 Hudson Yards, New York, NY 10001.
  • Aggregate beneficial ownership: 1,664,459 shares of Quantinuum Inc. Class A Stock, representing 4.5% of the class.
  • Sole voting power: 1,521,301 shares; shared voting power reported as 0.
  • Sole dispositive power: 1,664,459 shares; shared dispositive power reported as 0.
  • Triggering date: The event requiring this filing occurred on September 30, 2026.
  • Classification: The filing was signed by Spencer Fleming, Managing Director, on October 27, 2026.

BlackRock Portfolio Management's Amended 13G Filing on Quantinuum Class A Stock

BlackRock Portfolio Management LLC submitted Amendment No. 1 to a Schedule 13G regarding its holdings in Quantinuum Inc. (CUSIP 74768A104), whose principal executive offices are located at 303 S Technology Court, Broomfield, CO 80021. According to the filing, the event triggering this amended statement occurred on September 30, 2026, and the statement was certified and dated October 27, 2026.

The filing reports aggregate beneficial ownership of 1,664,459 shares of Quantinuum Inc. Class A Stock, equating to 4.5% of the outstanding class. Of those shares, 1,521,301 are held with sole voting power, while the remaining shares carry no associated voting authority in this filing. All 1,664,459 shares are held with sole dispositive power, and no shares are reported under shared dispositive power, according to the disclosure.

The filing notes, in accordance with SEC Release No. 34-39538, that the Schedule 13G reflects securities beneficially owned by certain business units described as "Reporting Business Units" of BlackRock, Inc. and its subsidiaries and affiliates, and "does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated." The filing also states that various persons have the right to receive dividends or sale proceeds from the reported shares, but that no single person's interest exceeds five percent of total outstanding common shares. The filer certified that the securities "were acquired and are held in the ordinary course of business" and not for the purpose of changing or influencing control of the issuer.

What Was Disclosed

BlackRock Portfolio Management LLC disclosed, via an amended Schedule 13G, beneficial ownership of 1,664,459 shares of Quantinuum Inc. Class A Stock, representing 4.5% of the class, with the triggering event dated September 30, 2026.