Honeywell reports 79.1% Quantinuum (QNT) stake and 124.6M shares owned

Rhea-AI Filing Summary

Honeywell International Inc., through itself and subsidiary Honeywell Holdings International Inc., reports beneficial ownership of Quantinuum Inc. Class A common stock as of June 30, 2026. Honeywell International beneficially owns 124,628,729 shares, representing 79.1% of Quantinuum’s Class A common stock, based on 32,862,895 shares outstanding at completion of Quantinuum’s June 5, 2026 initial public offering and assuming redemption of related LLC units into Class A shares.

The position includes 95,998,655 shares underlying units over which Honeywell International has sole voting and dispositive power and 28,630,074 shares over which voting and dispositive power is shared with Honeywell Holdings International. Honeywell Holdings International separately reports beneficial ownership of 28,630,074 shares, equal to 46.6% of the Class A common stock, all with shared voting and dispositive power.

Key Figures

Honeywell International beneficially owned shares: 124,628,729 shares Honeywell International percent of class: 79.1% Honeywell Holdings International owned shares: 28,630,074 shares +5 more

8 metrics

Honeywell International beneficially owned shares 124,628,729 shares Quantinuum Class A common stock as of June 30, 2026

Honeywell International percent of class 79.1% Percent of Quantinuum Class A common stock

Honeywell Holdings International owned shares 28,630,074 shares Quantinuum Class A common stock as of June 30, 2026

Honeywell Holdings International percent of class 46.6% Percent of Quantinuum Class A common stock

Shares outstanding at IPO 32,862,895 shares Quantinuum Class A shares outstanding at June 5, 2026 IPO completion

Sole voting power shares (Honeywell International) 95,998,655 shares Class A shares underlying units with sole voting and dispositive power

Shared voting power shares 28,630,074 shares Class A shares with shared voting and dispositive power

IPO completion date June 5, 2026 Quantinuum initial public offering completion date

Key Terms

beneficial ownership, shared voting power, sole dispositive power, initial public offering, +2 more

6 terms

beneficial ownership financial

"The ownership information presented below represents beneficial ownership of the shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

shared voting power financial

"6 | Shared Voting Power 28,630,074.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

sole dispositive power financial

"7 | Sole Dispositive Power 95,998,655.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

initial public offering financial

"shares of Class A Common Stock outstanding at the completion of the Issuer's initial public offering"

An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.

CUSIP Number financial

"(e) | CUSIP Number(s): 74768A104"

A CUSIP number is a nine-character code that uniquely identifies a specific U.S. or Canadian stock, bond, or other security, similar to a barcode or a social-security number for a financial instrument. It matters to investors because it removes confusion between similar securities, ensures trades and settlements are applied to the correct issue, and helps locate official documents and transaction records quickly.

common unit financial

"redemption of the common unit of Quantinuum Holdings, LLC ("Common Units") into shares"

A common unit is a single piece of ownership in a company, fund, or trust—similar to an ordinary share but often used for pooled vehicles or listings where securities are packaged or governed differently. It matters to investors because each unit represents a claim on profits and, commonly, voting power; like holding a seat at a table, the number of units you own affects your share of returns and influence, and unit structures can also affect liquidity and tax treatment.

FAQ

How much of Quantinuum Inc. (QNT) does Honeywell International own?

Honeywell International reports beneficial ownership of 124,628,729 Quantinuum Class A shares, representing 79.1% of the class. This is based on 32,862,895 shares outstanding at Quantinuum’s June 5, 2026 IPO and assumes redemption of related LLC units.

What stake in Quantinuum Inc. (QNT) does Honeywell Holdings International report?

Honeywell Holdings International reports beneficial ownership of 28,630,074 Quantinuum Class A shares, equal to 46.6% of the class. All of these shares are treated as having shared voting and dispositive power with Honeywell International.

What is the basis for the ownership percentages in this Quantinuum (QNT) Schedule 13G?

The ownership percentages use 32,862,895 Quantinuum Class A shares outstanding at completion of the June 5, 2026 IPO. The calculation also assumes one-to-one redemption of Quantinuum Holdings LLC common units into Quantinuum Class A common stock.

How is voting power over Quantinuum Inc. (QNT) shares allocated for Honeywell?

Honeywell International has sole voting power over 95,998,655 shares and shared voting power over 28,630,074 shares. Honeywell Holdings International has only shared voting power over the same 28,630,074 shares.

When is the ownership information for Quantinuum Inc. (QNT) in this Schedule 13G effective?

The beneficial ownership information is stated as of June 30, 2026. It is calculated using shares outstanding at the completion of Quantinuum’s initial public offering on June 5, 2026, as disclosed in the company’s prospectus.

What type of Quantinuum (QNT) securities does Honeywell’s Schedule 13G cover?

The Schedule 13G covers Quantinuum’s Class A Common Stock, par value $0.0001 per share, identified by CUSIP 74768A104. The reported holdings are largely shares underlying common units of Quantinuum Holdings, LLC assumed to be redeemable into Class A stock.

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Available on EDGAR 08/13/2026 - 05:50 PM Accepted by SEC EDGAR 08/13/2026 - 05:50 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Quantinuum Inc.

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Title of Class of Securities)

74768A104

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 74768A104

1

Names of Reporting Persons

Honeywell International Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 95,998,655.00
6	Shared Voting Power 28,630,074.00
7	Sole Dispositive Power 95,998,655.00
8	Shared Dispositive Power 28,630,074.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

124,628,729.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

79.1 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): 74768A104

1

Names of Reporting Persons

Honeywell Holdings International Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 28,630,074.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 28,630,074.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

28,630,074.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

46.6 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Quantinuum Inc.
(b)	Address of issuer's principal executive offices: 303 S Technology Court, Broomfield, CO, 80021
Item 2.
(a)	Name of person filing: Each of the following is hereinafter individually referred to as a "Reporting Person" and collectively as the "Reporting Persons." This statement is filed on behalf of: Honeywell International Inc. ("Honeywell Technologies") Honeywell Holdings International Inc.
(b)	Address or principal business office or, if none, residence: The principal business address of each of the Reporting Persons is c/o Honeywell International Inc., 855 S. Mint Street, Charlotte, NC 28202.
(c)	Citizenship: Each of the Reporting Persons is organized under the laws of the State of Delaware.
(d)	Title of class of securities: Class A Common Stock, par value $0.0001 per share
(e)	CUSIP Number(s): 74768A104
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The ownership information presented below represents beneficial ownership of the shares of Class A Common Stock as of June 30, 2026, based upon 32,862,895 shares of Class A Common Stock outstanding at the completion of the Issuer's initial public offering on June 5, 2026, as disclosed in the Issuer's Prospectus on Form 424B4 filed with the Securities and Exchange Commission on June 5, 2026. The ownership information also assumes the redemption of the common unit of Quantinuum Holdings, LLC ("Common Units") into shares of Class A Common Stock of the Issuer on a one-to-one basis, as applicable. The amounts reported as beneficially owned consist of (i) 28,630,074 shares of Class A Common Stock underlying Common Units held directly by Honeywell Holdings International Inc. and (ii) 95,998,655 shares of Class A Common Stock underlying Common Units held directly by Honeywell Technologies. Honeywell Holdings International Inc. is a wholly owned subsidiary of Honeywell Technologies, which is a publicly traded company with securities listed on The Nasdaq Stock Market LLC.
(b)	Percent of class: Honeywell Technologies: 79.1% Honeywell Holdings International Inc.: 46.6%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Honeywell Technologies: 95,998,655 Honeywell Holdings International Inc.: 0
	(ii) Shared power to vote or to direct the vote: Honeywell Technologies: 28,630,074 Honeywell Holdings International Inc.: 28,630,074
	(iii) Sole power to dispose or to direct the disposition of: Honeywell Technologies: 95,998,655 Honeywell Holdings International Inc.: 0
	(iv) Shared power to dispose or to direct the disposition of: Honeywell Technologies: 28,630,074 Honeywell Holdings International Inc.: 28,630,074
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Honeywell International Inc.

Signature:	/s/ Su Ping Lu
Name/Title:	Su Ping Lu, Senior Vice President, General Counsel and Corporate Secretary
Date:	08/13/2026

Honeywell Holdings International Inc.

Signature:	/s/ Jake Wasserman
Name/Title:	Jake Wasserman, Secretary
Date:	08/13/2026

Exhibit Information

Exhibit 99.1: Joint Filing Agreement.