X0609 4 2026-06-03 0 0002110105 Quantinuum Inc. QNT 0002136882 Dehoff Kevin Scott false C/O QUANTINUUM INC. 303 S TECHNOLOGY COURT BROOMFIELD CO 80021 0 1 0 0 Chief Strategy Officer 0 Class A Common Stock 2026-06-03 4 A 0 111460 A 111460 D Class A Common Stock 2026-06-05 4 P 0 15000 60 A 126460 D This transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Securities Exchange Act of 1934, as amended, in connection with the Issuer's initial public offering, and is reported herein pursuant to Rule 16a-2(a). Represents an acquisition of restricted shares of Class A Common Stock pursuant to a recapitalization transaction. /s/ Rajeeb Hazra, Attorney-in-Fact 2026-06-08