Quantinuum Inc. shareholders Cambridge Quantum Holdings Limited, CQ Invest I LLC, Ilyas Khan and Waseem Shiraz filed a joint Schedule 13G reporting concerted beneficial ownership positions. The filing states 82,884,823 shares of Class A common stock are issuable upon conversion of Common Units and Class B shares, representing approximately 71.5% of Class A on the conversion basis as reported in the issuer's prospectus dated June 3, 2026.
The filing discloses that Cambridge Quantum Holdings Limited directly holds 82,353,103 Common Units and CQ Invest I LLC holds 531,720 Common Units. Mr. Khan directly holds 480,511 Class A shares and Mr. Shiraz directly holds 27,001 Class A shares in their personal capacities.
Positive
None.
Negative
None.
Insights
Major voting block disclosed; control structure clarified.
The statement lists Cambridge Quantum Holdings Limited as holding 82,353,103 Common Units and CQ Invest I LLC as holding 531,720 Common Units, which convert one-for-one into Class A shares per the prospectus dated June 3, 2026. The filing attributes shared voting and dispositive power over 82,884,823 shares to the group.
Disclosure clarifies managerial links: Cambridge Quantum is the administrative manager of CQ Invest I LLC and is managed by a board including Ilyas Khan and Waseem Shiraz. The filing preserves standard disclaimers of individual beneficial ownership except as expressly stated.
Schedule 13G filed jointly; positions and voting powers enumerated.
The joint filing identifies the Reporting Persons and quantifies ownership percentages using the issuer's prospectus figures. It states the group’s holdings as 82,884,823 shares issuable upon conversion and cites the conversion mechanics (one-for-one exchange or cash at issuer election).
Qualifying language and signature page reference a Joint Filing Agreement dated June 22, 2026. The filing follows passive investor disclosure format and does not state intent to influence governance.
Key Figures
Convertible shares reported:82,884,823 sharesCambridge Quantum Common Units:82,353,103 Common UnitsCQ Invest I Common Units:531,720 Common Units+4 more
7 metrics
Convertible shares reported82,884,823 sharesissuable upon conversion per prospectus dated <date>June 3, 2026</date>
Cambridge Quantum Common Units82,353,103 Common Unitsdirectly held by Cambridge Quantum Holdings Limited
CQ Invest I Common Units531,720 Common Unitsdirectly held by CQ Invest I LLC
Ilyas Khan direct shares480,511 sharesClass A common stock held in personal capacity
Waseem Shiraz direct shares27,001 sharesClass A common stock held in personal capacity
Percent of Class A (conversion basis)71.5%percentage reported using issuer prospectus base
Shares of Class A outstanding used32,862,895 sharesClass A shares reported by issuer in prospectus dated <date>June 3, 2026</date>
Key Terms
Common Units, beneficially owned, shared dispositive power
3 terms
Common Unitsfinancial
"Each Common Unit (together with a corresponding share of Class B common stock) is exchangeable for one share"
Common units are the basic ownership stakes in a company, limited partnership, or trust that function like common stock: they give holders a claim on profits and often voting rights. Think of them as the ordinary seats at a table—the most directly affected by the business’s success or failure, so they typically offer higher upside but carry greater risk than preferred claims or creditors, which matters to investors evaluating potential return and safety.
beneficially ownedregulatory
"82,884,823 shares of Class A common stock beneficially owned by the Reporting Persons"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
shared dispositive powerregulatory
"Shared Dispositive Power 82,884,823.00"
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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)
06/04/2026
(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
Cambridge Quantum Holdings Limited
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
CAYMAN ISLANDS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
82,884,823.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
82,884,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
82,884,823.00
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)
71.6 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP Number(s):
74768A104
1
Names of Reporting Persons
CQ Invest I LLC
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
531,720.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
531,720.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
531,720.00
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)
1.6 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
74768A104
1
Names of Reporting Persons
Ilyas Khan
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
UNITED KINGDOM
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
480,511.00
6
Shared Voting Power
82,884,823.00
7
Sole Dispositive Power
480,511.00
8
Shared Dispositive Power
82,884,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
83,365,334.00
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)
72.0 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP Number(s):
74768A104
1
Names of Reporting Persons
Waseem Shiraz
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
UNITED KINGDOM
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
27,001.00
6
Shared Voting Power
82,884,823.00
7
Sole Dispositive Power
27,001.00
8
Shared Dispositive Power
82,884,823.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
82,911,824.00
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)
71.6 %
12
Type of Reporting Person (See Instructions)
IN
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:
This statement is being filed on behalf of each of the following persons (collectively, the "Reporting Persons"):
Cambridge Quantum Holdings Limited
CQ Invest I LLC
Ilyas Khan
Waseem Shiraz
(b)
Address or principal business office or, if none, residence:
c/o Cambridge Quantum North America Holdings, LLC, 1300 N 17th Street, Suite 530, Arlington, VA 22209
(c)
Citizenship:
Cambridge Quantum Holdings Limited is organized under the laws of the Cayman Islands. CQ Invest I LLC is organized under the laws of the State of Delaware. Each of Ilyas Khan and Waseem Shiraz is a citizen of the United Kingdom.
(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:
As of the date of this statement, (i) Cambridge Quantum Holdings Limited directly holds 82,353,103 Common Units and a corresponding number of shares of Class B common stock of the Issuer, representing approximately 71.5% of the Issuer's Class A common stock assuming the conversion of Common Units and shares of Class B common stock on a one-to-one basis, and (ii) CQ Invest I LLC directly holds 531,720 common units of Quantinuum Holdings, LLC (the "Common Units") and a corresponding number of shares of Class B common stock of the Issuer, representing approximately 1.6% of the Issuer's Class A common stock assuming the conversion of Common Units and shares of Class B common stock on a one-to-one basis.
Each Common Unit (together with a corresponding share of Class B common stock) is exchangeable for one share of Class A common stock of the Issuer (or, at the Issuer's election, cash). Cambridge Quantum Holdings Limited is the administrative manager of CQ Invest I LLC, and has the right to manage, control and conduct the affairs and operations of CQ Invest I LLC. Cambridge Quantum Holdings Limited is managed by a board of directors, which is composed of Ilyas Khan and Waseem Shiraz, who have the power to vote or direct the vote of, and power to dispose or to direct the disposition of, the shares and units held by CQ Invest I LLC. Mr. Khan, including entities controlled by him, is the controlling shareholder of Cambridge Quantum Holdings Limited. Mr. Khan and Mr. Shiraz disclaim beneficial ownership of the securities that may be deemed to be beneficially owned by Cambridge Quantum Holdings Limited and CQ Invest I LLC, except to the extent of their respective pecuniary interest therein.
As of the date of this statement, Ilyas Khan directly owns 480,511 shares of Class A common stock in his personal capacity and the other Reporting Persons are not deemed beneficial owners of these securities. As of the date of this statement, Waseem Shiraz directly owns 27,001 shares of Class A common stock in his personal capacity and the other Reporting Persons are not deemed beneficial owners of these securities.
The percentage of ownership is based on (i) 32,862,895 shares of Class A common stock and (ii) 82,884,823 shares of Class A common stock beneficially owned by the Reporting Persons, issuable upon conversion as set forth above, as reported by the Issuer in its prospectus dated June 3, 2026.
(b)
Percent of class:
See Item 4(a) hereof.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See Item 4(a) hereof.
(ii) Shared power to vote or to direct the vote:
See Item 4(a) hereof.
(iii) Sole power to dispose or to direct the disposition of:
See Item 4(a) hereof.
(iv) Shared power to dispose or to direct the disposition of:
See Item 4(a) hereof.
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.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
See Item 2(a) hereof.
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.
Cambridge Quantum Holdings Limited
Signature:
/s/ Waseem Shiraz
Name/Title:
Waseem Shiraz/Director
Date:
06/22/2026
CQ Invest I LLC
Signature:
/s/ Waseem Shiraz
Name/Title:
Waseem Shiraz/Director
Date:
06/22/2026
Ilyas Khan
Signature:
/s/ Ilyas Khan
Name/Title:
Ilyas Khan
Date:
06/22/2026
Waseem Shiraz
Signature:
/s/ Waseem Shiraz
Name/Title:
Waseem Shiraz
Date:
06/22/2026
Comments accompanying signature: Exhibit A, Joint Filing Agreement, dated as of June 22, 2026.
What stake does Cambridge Quantum report in Quantinuum (QNT)?
Cambridge Quantum Holdings Limited reports beneficial ownership of 82,353,103 Common Units, convertible one-for-one into Class A shares, which the prospectus equates to about 71.5% on a conversion basis as of June 3, 2026.
How many Class A shares do Ilyas Khan and Waseem Shiraz directly own?
Ilyas Khan directly owns 480,511 Class A shares and Waseem Shiraz directly owns 27,001 Class A shares, each reported in their personal capacities on the Schedule 13G filed June 22, 2026.
Does the filing state conversion mechanics for Common Units?
Yes. The filing states each Common Unit, together with a corresponding Class B share, is exchangeable for one share of Class A common stock or, at the issuer’s election, cash, per the prospectus language quoted in the filing.
Is Cambridge Quantum the manager of CQ Invest I LLC?
The filing states Cambridge Quantum Holdings Limited is the administrative manager of CQ Invest I LLC and has rights to manage and direct the affairs and voting of CQ Invest I LLC’s holdings, as described in Item 4(a).
What percentage of Class A does the group report owning?
The filing ties its percentage calculations to the issuer’s prospectus, reporting that the convertible holdings represent approximately 71.5% of Class A common stock on a conversion basis as of the prospectus dated June 3, 2026.
