Quantinuum Inc. – Indentures Watch

from S-1/A 2 pages See Reverse for Certain Definitions and Legends C U S I P 74768a 10 4 Incorporated Under the Laws of the State of Delaware Seal January 20, 2026 Fully Paid and Non Assessable Shares of Class a Common Stock, $0.0001 Par Value Per Share, of Quantinuum, Inc. Transferable on the Books of the Corporation in Person or by Duly Authorized Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate and the Shares Represented Hereby Are Issued and Shall Be Held Subject to All of the Provisions of the Certificate of Incorporation, as Amended, and the Bylaws, as Amended, of the Corporation (Copies of Which Are on File With the Corporation and With the Transfer Agent), to All of Which Each Holder, by Acceptance Hereof, Assents. This Certificate Is Not Valid Until Countersigned by the Transfer Agent and Registered by the Registrar. Witness the Facsimile Seal of the Corporation and the Facsimile Signatures of Its Duly Authorized Officers. Dated: Countersigned and Registered: E Q U I N I T I Trust Company, LLC Transfer Agent and Registrar By: Chief Executive Officer Chief Financial Officer Authorized Signature