Quantinuum (QNT) CCO Lawrence Stack reports 178,337 restricted shares on Form 3

Rhea-AI Filing Summary

Quantinuum Inc. filed an initial Form 3 showing Chief Commercial Officer Lawrence Joseph Stack’s equity stake in the company. He holds 178,337 shares of Class A Common Stock as restricted stock, reported as directly owned. This filing records his starting ownership position and does not reflect any recent buy or sell transaction.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Stack Lawrence Joseph

Role Chief Commercial Officer

Type	Security	Shares	Price	Value
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 178,337 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Restricted stock holdings: 178,337 shares

1 metrics

Restricted stock holdings 178,337 shares Class A Common Stock held directly, initial Form 3

Key Terms

restricted stock, Class A Common Stock, Form 3

3 terms

restricted stock financial

"Represents shares of restricted stock."

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Class A Common Stock financial

"security title listed as Class A Common Stock."

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

Form 3 regulatory

"Initial statement of beneficial ownership reported on Form 3."

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Stack Lawrence Joseph

(Last) (First) (Middle)

C/O QUANTINUUM INC.

303 S TECHNOLOGY COURT

(Street)

BROOMFIELD COLORADO 80021

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/04/2026

3. Issuer Name and Ticker or Trading Symbol
Quantinuum Inc. [ QNT ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Commercial Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	178,337(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares of restricted stock.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Rajeeb Hazra, Attorney-in-Fact	06/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the Quantinuum (QNT) Form 3 filing for Lawrence Joseph Stack show?

The Form 3 filing shows Chief Commercial Officer Lawrence Joseph Stack’s initial ownership in Quantinuum. It reports 178,337 shares of Class A Common Stock as restricted stock held directly, establishing his baseline equity position as an executive officer without indicating any recent trading activity.

How many Quantinuum (QNT) shares does Lawrence Joseph Stack report on Form 3?

Lawrence Joseph Stack reports beneficial ownership of 178,337 shares of Quantinuum Class A Common Stock. The filing specifies that these shares represent restricted stock, giving investors a clear view of his initial equity interest as Chief Commercial Officer at the time of the statement.

Are the Quantinuum (QNT) shares in the Form 3 filing restricted stock?

Yes. A footnote explains that the 178,337 shares reported for Lawrence Joseph Stack represent shares of restricted stock. Restricted stock typically vests over time or upon conditions, so this note clarifies the nature of his holdings rather than indicating freely tradable common shares.

Does the Quantinuum (QNT) Form 3 indicate that Lawrence Joseph Stack recently bought or sold shares?

No. The Form 3 is an initial statement of beneficial ownership, not a trade report. It lists 178,337 restricted shares of Class A Common Stock held directly, without any coded purchase or sale transactions, so it simply records his starting position as an officer.

What type of security is reported in the Quantinuum (QNT) Form 3 for Lawrence Joseph Stack?

The filing reports Class A Common Stock for Lawrence Joseph Stack, identified specifically as restricted stock. This means his equity is in the company’s primary common share class, but subject to restrictions such as vesting, rather than being immediately and fully transferable in the market.