# EDGAR Filing Document

**Accession Number:** 0002135683
**File Stem:** 0001493152-26-029497
**Filing Date:** 2026-6
**Character Count:** 16949
**Document Hash:** 87748c40a14ca3067edcc5afeedb67f9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001493152-26-029497.hdr.sgml**: 20260622

**ACCESSION NUMBER**: 0001493152-26-029497

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260622

**DATE AS OF CHANGE**: 20260622

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Quantinuum Inc.
- **CENTRAL INDEX KEY:** 0002110105
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95768
- **FILM NUMBER:** 261104964

**BUSINESS ADDRESS:**
- **STREET 1:** 303 S TECHNOLOGY COURT
- **CITY:** BROOMFIELD
- **STATE:** CO
- **BUSINESS PHONE:** (855) 888-7686

**MAIL ADDRESS:**
- **STREET 1:** 303 S TECHNOLOGY COURT
- **CITY:** BROOMFIELD
- **STATE:** CO
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cambridge Quantum Holdings Ltd
- **CENTRAL INDEX KEY:** 0002135683

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 2ND FLOOR PARTNERSHIP HOUSE
- **STREET 2:** CARLISLE PLACE
- **CITY:** LONDON
- **PROVINCE COUNTRY:** X0
- **ZIP:** SW1P 1BX
- **BUSINESS PHONE:** 44 20 3047 1353

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 2ND FLOOR PARTNERSHIP HOUSE
- **STREET 2:** CARLISLE PLACE
- **CITY:** LONDON
- **PROVINCE COUNTRY:** X0
- **ZIP:** SW1P 1BX

## Ex-1

**<u>EXHIBIT A</u>**

**JOINT FILING AGREEMENT**

Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the "Exchange Act") the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, restatement, supplement, and/or exhibit thereto) with respect to securities of Quantinuum Inc., a Delaware corporation, and further agree to the filing, furnishing, and/or incorporation by reference of this Agreement as an exhibit thereto. Each of them is responsible for the timely filing of such filings and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate. This Agreement shall remain in full force and effect until revoked by any party hereto in a signed writing provided to each other party hereto, and then only with respect to such revoking party. This Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.

---

| | | |
|:---|:---|:---|
| Dated: June 22, 2026 |  |  |
|  | **Cambridge Quantum Holdings Limited** | **Cambridge Quantum Holdings Limited** |
|  | */s/ Waseem Shiraz* | */s/ Waseem Shiraz* |
|  | Name: | Waseem Shiraz |
|  | Title: | Director |
|  | **CQ Invest I LLC** | **CQ Invest I LLC** |
|  | */s/ Waseem Shiraz* | */s/ Waseem Shiraz* |
|  | Name: | Waseem Shiraz |
|  | Title: | Director |
|  | */s/ Ilyas Khan* | */s/ Ilyas Khan* |
|  | **Ilyas Khan** | **Ilyas Khan** |
|  | */s/ Waseem Shiraz* | */s/ Waseem Shiraz* |
|  | **Waseem Shiraz** | **Waseem Shiraz** |

---

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**Issuer:** Quantinuum Inc.

**Title of Class of Securities:** Class A common stock, par value $0.0001 per share

**CUSIP Number:** —

**Date of Event Which Requires Filing of this Statement:** 06/04/2026

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

- [ ] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [x] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Cambridge Quantum Holdings Limited | Names of Reporting Persons<br>Cambridge Quantum Holdings Limited |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>E9 | Citizenship or Place of Organization<br>E9 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>82884823.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>82884823.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>82884823.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>82884823.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>71.6% | Percent of Class Represented by Amount in Row (9)<br>71.6% |
| 12. | Type of Reporting Person (See Instructions)<br>HC | Type of Reporting Person (See Instructions)<br>HC |

---

| 1. | Names of Reporting Persons<br>CQ Invest I LLC | Names of Reporting Persons<br>CQ Invest I LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>531720.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>531720.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>531720.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>531720.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>1.6% | Percent of Class Represented by Amount in Row (9)<br>1.6% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

---

| 1. | Names of Reporting Persons<br>Ilyas Khan | Names of Reporting Persons<br>Ilyas Khan |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X0 | Citizenship or Place of Organization<br>X0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>480511.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>82884823.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>480511.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>82884823.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>83365334.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>83365334.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>72.0% | Percent of Class Represented by Amount in Row (9)<br>72.0% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

| 1. | Names of Reporting Persons<br>Waseem Shiraz | Names of Reporting Persons<br>Waseem Shiraz |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [x] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X0 | Citizenship or Place of Organization<br>X0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>27001.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>82884823.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>27001.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>82884823.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>82911824.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>82911824.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>71.6% | Percent of Class Represented by Amount in Row (9)<br>71.6% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

**Item 1(a). Name of Issuer:**
Quantinuum Inc.

**Item 1(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

**Item 2(b). Address of Principal Business Office:**
c/o Cambridge Quantum North America Holdings, LLC, 1300 N 17th Street, Suite 530, Arlington, VA 22209

**Item 2(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.

**Item 2(d). Title of Class of Securities:**
Class A common stock, par value $0.0001 per share

**Item 2(e). CUSIP Number:**
—

**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 Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

Not Applicable

**Item 8. Identification and Classification of Members of the Group**

See Item 2(a) hereof.

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

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**

**Date:** 06/22/2026

**By:** /s/ Waseem Shiraz

**Name & Title:** Waseem Shiraz/Director

**CQ Invest I LLC**

**Date:** 06/22/2026

**By:** /s/ Waseem Shiraz

**Name & Title:** Waseem Shiraz/Director

**Ilyas Khan**

**Date:** 06/22/2026

**By:** /s/ Ilyas Khan

**Name & Title:** Ilyas Khan

**Waseem Shiraz**

**Date:** 06/22/2026

**By:** /s/ Waseem Shiraz

**Name & Title:** Waseem Shiraz