Quantinuum Inc. (QNT)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-04 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Quantinuum Inc. (QNT) CIK: 0002110105 --- Reporting Owner --- Name: Barron Hal CIK: 0001418677 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-06-04 | Code: A (Grant or award) Shares: +5,833 | Price: $0.00 Shares Owned After: 5,833 | Ownership: D (Direct) Footnotes: [F1] Represents an award of restricted stock units ("RSUs"), each of which represents a contingent right to receive one share of Class A Common Stock. The RSUs will vest in three equal annual installments beginning on June 5, 2027. [Transaction #2] Security: Class A Common Stock Date: 2026-06-05 | Code: P (Open market purchase) Shares: +250,000 | Price: $60.00 Total Value: $15,000,000.00 Shares Owned After: 255,833 | Ownership: D (Direct) --- Footnotes (Complete Index) --- F1: Represents an award of restricted stock units ("RSUs"), each of which represents a contingent right to receive one share of Class A Common Stock. The RSUs will vest in three equal annual installments beginning on June 5, 2027. --- Signature --- /s/ /s/ Rajeeb Hazra, Attorney-in-Fact (2026-06-08)