Changes in Beneficial Ownership · 4/A

Quantinuum Inc.

QNTNASDAQEQUITYCurrent

Changes in Beneficial Ownership

Filed Jul 22, 2026Accepted Jul 22, 2026, 8:44 PM EDTFiling CIK 2110105Accession 0001193125-26-312779

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Structured filing — 4/A

ownership.xml

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Amendment · This filing reports the amendment as submitted.

Filing details

Report period: 2026-07-17
Original submission: 2026-07-21
Issuer: Quantinuum Inc.
Issuer CIK: 0002110105
Trading symbol: QNT

Reporting owner 1

Name: Schulman Robin
Reporting owner CIK: 0001627835
Relationship: Officer
Officer title: CLO & Corporate Secretary
Address: C/O QUANTINUUM INC., 303 S TECHNOLOGY COURT, BROOMFIELD, CO, 80021

Non-derivative transactions

Non-derivative transactions · 1 reported row
Security	Transaction date	Code	Amount	A / D	Price (USD)	Owned after	Ownership
Class A Common Stock	2026-07-17	A · Form 4	125,000^[F1]	A	0	125,000	D

Table key

A · Form 4: Acquisition by grant, award or otherwise under Rule 16b-3(d)
A: Acquired
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 according to the applicable grant agreement.↩ 1

Remarks

This Form 4 amendment is being filed to update the number of RSUs acquired by the Reporting Person on July 17, 2026.

Signature 1

Signed: /s/ Robin Schulman
Date: 2026-07-22

Company context

Quantinuum is a leading quantum computing platform that offers solutions like hardware platforms, developer tools, application libraries and solution-targeted intellectual property (“IP”). Our vertically integrated quantum computing platform combines sophisticated quantum hardware systems and middleware with application software designed to make quantum computing deployable in real-world environments. By enabling hybrid quantum-classical computing workflows with our software, we believe we accelerate the creation of entirely new application categories, such as quantum-enabled AI.

Current securities

QNTNASDAQ · EQUITY · Current

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