Capital Research takes 5.3% stake in Quantinuum

Capital Research Global Investors, a division of Capital Research and Management Company and its investment management affiliates, reported beneficial ownership of 1,754,325 shares of Quantinuum Inc. common stock.

Rhea-AI Filing Summary

Capital Research Global Investors, a division of Capital Research and Management Company and its investment management affiliates, reported beneficial ownership of 1,754,325 shares of Quantinuum Inc. common stock. This represents 5.3% of the 32,862,895 shares believed to be outstanding.

Capital Research Global Investors reports sole voting and dispositive power over all 1,754,325 shares, with no shared voting or dispositive power.

Key Figures

Shares beneficially owned: 1,754,325 shares Percent of class: 5.3% Shares believed outstanding: 32,862,895 shares +2 more

5 metrics

Shares beneficially owned 1,754,325 shares Quantinuum Inc. common stock reported by Capital Research Global Investors

Percent of class 5.3% Portion of Quantinuum Inc. common stock beneficially owned

Shares believed outstanding 32,862,895 shares Quantinuum Inc. common shares believed to be outstanding for ownership calculation

Sole voting power 1,754,325 shares Shares over which Capital Research Global Investors has sole voting power

Sole dispositive power 1,754,325 shares Shares over which Capital Research Global Investors has sole dispositive power

Key Terms

beneficial owner, sole voting power, sole dispositive power, Schedule 13G, +1 more

5 terms

beneficial owner financial

"CRGI is deemed to be the beneficial owner of 1,754,325 shares"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Sole Voting Power 1,754,325.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 1,754,325.00"

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.

Schedule 13G regulatory

"Form type: SCHEDULE 13G reporting beneficial ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

percent of class financial

"Percent of class: 5.3 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What percentage of Quantinuum Inc. (QNT) does Capital Research Global Investors own?

Capital Research Global Investors reports beneficial ownership of 5.3% of Quantinuum Inc. common stock, representing 1,754,325 shares out of 32,862,895 shares believed to be outstanding.

How many Quantinuum Inc. (QNT) shares does Capital Research Global Investors control?

Capital Research Global Investors is deemed the beneficial owner of 1,754,325 Quantinuum Inc. common shares, with sole voting power and sole dispositive power over all of these shares and no shared power reported.

What type of filing discloses Capital Research Global Investors’ stake in Quantinuum Inc. (QNT)?

The stake is disclosed in a Schedule 13G, which reports passive beneficial ownership of more than 5% of a class of registered equity securities, including 1,754,325 Quantinuum Inc. shares in this case.

Who signed the Quantinuum Inc. (QNT) Schedule 13G for Capital Research Global Investors?

The filing was signed by Jae Won Chung, Senior Vice President and Associate General Counsel of Capital Research and Management Company, on 08/11/2026, certifying the reported ownership information.

Does Capital Research Global Investors share voting or dispositive power over Quantinuum Inc. (QNT) shares?

No. The filing states sole voting power and sole dispositive power over 1,754,325 shares, and reports 0 for both shared voting power and shared dispositive power in Quantinuum Inc. stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/12/2026 - 05:08 PM Accepted by SEC EDGAR 08/12/2026 - 05:08 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)

Common Stock

(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

Capital Research Global Investors

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 1,754,325.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,754,325.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,754,325.00

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)

5.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Quantinuum Inc.
(b)	Address of issuer's principal executive offices: 303 S TECHNOLOGY COURT, BROOMFIELD, 80021 CO
Item 2.
(a)	Name of person filing: Capital Research Global Investors
(b)	Address or principal business office or, if none, residence: 333 South Hope Street, 55th Fl, Los Angeles, CA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(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: 1,754,325 ** **Capital Research Global Investors ("CRGI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CRGI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital Research Global Investors." CRGI is deemed to be the beneficial owner of 1,754,325 shares or 5.3% of the 32,862,895 shares believed to be outstanding.
(b)	Percent of class: 5.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,754,325
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,754,325
	(iv) Shared power to dispose or to direct the disposition of: 0
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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Capital Research Global Investors

Signature:	Jae Won Chung
Name/Title:	Senior Vice President and Associate General Counsel, Capital Research and Management Company
Date:	08/11/2026