Skip to content
Baker Capital StrategiesMARKETS. FILINGS. PERSPECTIVE.
Powered by THEMA

BAKER CAPITAL STRATEGIES

Get the free weekly BCS email.

Selected company filings and market updates, delivered by email. Your first report will follow soon.

  • Your weekly BCS reportMarket updates and links to filings you can explore.
  • THEMA at launchWe’ll send directions for setting up your filing alerts when THEMA officially opens.

One signup for the weekly email and your free THEMA Basic account at launch.

Already registered or a CSW member?Log in to THEMA →

At least 8 characters. This also creates your free THEMA account for launch.

You’re signing up for the weekly BCS email and THEMA launch/setup updates. Unsubscribe using the link in any email. Privacy policy · Terms

BCS
Home/The Filing Wire/Quantinuum Inc./ SCHEDULE 13G

Beneficial Ownership Report · SCHEDULE 13G

Quantinuum Inc.

QNTNASDAQEQUITYCurrent

Beneficial Ownership Report

Filed Oct 6, 2026Accepted Oct 6, 2026, 5:20 PM EDTFiling CIK 2110105Accession 0001104659-26-114121
View company →Permanent SEC source ↗
Share

Structured filing — SCHEDULE 13G

primary_doc.xml

Open full document ↗

Subject company

Company
Quantinuum Inc.
Company CIK
0002110105
Street
303 S Technology Court
City
Broomfield
State / country code
CO
Postal code
80021

Statement details

Security class
Class A common stock, par value $0.0001 per share (the "Shares")
Event date
06/30/2026
Rule designation
Rule 13d-1(b)

Reporting person 1

Name
Citadel Advisors LLC
Citizenship / organization
DE
Reporting person type
IA · HC · OO
Aggregate amount owned
2,299,997.00
Percent of class
7.0
Sole voting power
0.00
Shared voting power
2,299,997.00
Sole dispositive power
0.00
Shared dispositive power
2,299,997.00
Aggregate excludes certain shares
N
Comments
The percentages reported in this Schedule 13G are based upon 32,862,895 Shares outstanding as of June 5, 2026 (according to the issuer's prospectus as filed with the Securities and Exchange Commission on June 5, 2026).

Reporting person 2

Name
Citadel Advisors Holdings LP
Citizenship / organization
DE
Reporting person type
HC · PN
Aggregate amount owned
2,299,997.00
Percent of class
7.0
Sole voting power
0.00
Shared voting power
2,299,997.00
Sole dispositive power
0.00
Shared dispositive power
2,299,997.00
Aggregate excludes certain shares
N

Reporting person 3

Name
Citadel GP LLC
Citizenship / organization
DE
Reporting person type
HC · OO
Aggregate amount owned
2,299,997.00
Percent of class
7.0
Sole voting power
0.00
Shared voting power
2,299,997.00
Sole dispositive power
0.00
Shared dispositive power
2,299,997.00
Aggregate excludes certain shares
N

Reporting person 4

Name
Citadel Securities LLC
Citizenship / organization
DE
Reporting person type
BD · OO
Aggregate amount owned
103,430.00
Percent of class
0.3
Sole voting power
0.00
Shared voting power
103,430.00
Sole dispositive power
0.00
Shared dispositive power
103,430.00
Aggregate excludes certain shares
N

Reporting person 5

Name
Citadel Securities Group LP
Citizenship / organization
DE
Reporting person type
HC · PN
Aggregate amount owned
103,430.00
Percent of class
0.3
Sole voting power
0.00
Shared voting power
103,430.00
Sole dispositive power
0.00
Shared dispositive power
103,430.00
Aggregate excludes certain shares
N

Reporting person 6

Name
Citadel Securities GP LLC
Citizenship / organization
DE
Reporting person type
HC · OO
Aggregate amount owned
103,430.00
Percent of class
0.3
Sole voting power
0.00
Shared voting power
103,430.00
Sole dispositive power
0.00
Shared dispositive power
103,430.00
Aggregate excludes certain shares
N

Reporting person 7

Name
Kenneth Griffin
Citizenship / organization
X1
Reporting person type
HC · IN
Aggregate amount owned
2,403,427.00
Percent of class
7.3
Sole voting power
0.00
Shared voting power
2,403,427.00
Sole dispositive power
0.00
Shared dispositive power
2,403,427.00
Aggregate excludes certain shares
N

Item 1

Issuer

Quantinuum Inc.

Principal executive office address

303 S Technology Court Broomfield, CO, 80021

Item 2

Citizenship

Each of Citadel Advisors, CGP, Citadel Securities and CSGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen.

Filing person

This Schedule 13G is being jointly filed by Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Securities GP LLC ("CSGP") and Mr. Kenneth Griffin (collectively with Citadel Advisors, CAH, CGP, Citadel Securities, CALC4 and CSGP, the "Reporting Persons") with respect to the Shares of the above-named issuer held of record by Citadel Multi-Strategy Equities Master Fund Ltd., a Cayman Islands company ("CM"), and Citadel Securities. Such Shares may include other instruments exercisable for or convertible into Shares. Citadel Advisors is the portfolio manager for CM. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. CALC4 is the non-member manager of Citadel Securities. CSGP is the general partner of CALC4. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP.

Principal business or residence address

The address of each of the Reporting Persons is 830 Brickell Plaza, Miami, Florida 33131.

Item 3

Not applicable indication

N

Type of filing person

BD · IA · HC

Item 4

Percent of class

1. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 7.0% of the Shares outstanding. 2. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 0.3% of the Shares outstanding. 3. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 0.3% of the Shares outstanding. 4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 7.3% of the Shares outstanding.

Amount beneficially owned

1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 2,299,997 Shares. 2. Citadel Securities LLC may be deemed to beneficially own 103,430 Shares. 3. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 103,430 Shares. 4. Mr. Griffin may be deemed to beneficially own 2,403,427 Shares.

Sole voting power

1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 2. Citadel Securities LLC: 0 3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 4. Mr. Griffin: 0

Shared voting power

1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 2,299,997 2. Citadel Securities LLC: 103,430 3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 103,430 4. Mr. Griffin: 2,403,427

Sole dispositive power

1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 2. Citadel Securities LLC: 0 3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 4. Mr. Griffin: 0

Shared dispositive power

1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 2,299,997 2. Citadel Securities LLC: 103,430 3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 103,430 4. Mr. Griffin: 2,403,427

Item 5

Not applicable indication

Y

Item 6

Not applicable indication

Y

Item 7

Not applicable indication

Y

Item 8

Not applicable indication

Y

Item 9

Not applicable indication

Y

Item 10

Not applicable indication

N

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.

Exhibits

Exhibit 99.1 - Joint Filing Agreement

Signature comments

* Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.

Signature 1

Reporting person
Citadel Advisors LLC
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 2

Reporting person
Citadel Advisors Holdings LP
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 3

Reporting person
Citadel GP LLC
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 4

Reporting person
Citadel Securities LLC
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 5

Reporting person
Citadel Securities Group LP
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 6

Reporting person
Citadel Securities GP LLC
Signed
/s/ Seth Levy
Title
Seth Levy, Authorized Signatory
Date
10/06/2026

Signature 7

Reporting person
Kenneth Griffin
Signed
/s/ Seth Levy
Title
Seth Levy, attorney-in-fact*
Date
10/06/2026

Filed exhibits

Company context

Quantinuum is a leading quantum computing platform that offers solutions like hardware platforms, developer tools, application libraries and solution-targeted intellectual property (“IP”). Our vertically integrated quantum computing platform combines sophisticated quantum hardware systems and middleware with application software designed to make quantum computing deployable in real-world environments. By enabling hybrid quantum-classical computing workflows with our software, we believe we accelerate the creation of entirely new application categories, such as quantum-enabled AI.

Current securities

QNTNASDAQ · EQUITY · Current

Recent company filings

  1. 10-Q filingNov 10, 2026
  2. Results of Operations and Financial ConditionNov 5, 2026
  3. SCHEDULE 13G/A - filed by BlackRock Portfolio Management LLC regarding Quantinuum Inc.Oct 27, 2026
  4. Entry into a Material Definitive Agreement · Unregistered Sales of Equity Securities · Regulation FD DisclosureSep 8, 2026
  5. 10-Q filingAug 13, 2026

Privacy choices

BCS measures page use with Google Analytics using regional consent settings. You can change your preference here. Charts and market data remain available.

Essential functions — always available. Security, navigation, registration and remembering these choices.

Audience analytics

Analytics cookies are off by default for visitors Google identifies in the EEA, UK or Switzerland until allowed. Limited measurement without analytics cookies may still occur under those regional defaults.

TradingView charts, quotes and the economic calendar load automatically as page content. TradingView receives network and browser information and may collect its own usage analytics. This choice controls BCS’s Google Analytics only.

Google advertising is not enabled. Direct sponsor links do not load advertising trackers on BCS.

Turning analytics off stops future Google Analytics activity here. It does not erase information already received by the provider. Read the privacy policy.