Beneficial Ownership Report · SCHEDULE 13G/A
Quantinuum Inc.
QNTNASDAQEQUITYCurrent
Beneficial Ownership Report
Structured filing — SCHEDULE 13G/A
primary_doc.xml
Amendment · This filing reports the amendment as submitted.
Subject company
- Company
- QUANTINUUM INC
- Company CIK
- 0002110105
- Street
- 303 S Technology Court
- City
- Broomfield
- State / country code
- CO
- Postal code
- 80021
Statement details
- Amendment number
- 1
- Security class
- Class A Stock
- Event date
- 09/30/2026
- Rule designation
- Rule 13d-1(b)
Reporting person 1
- Name
- BlackRock Portfolio Management LLC
- Citizenship / organization
- DE
- Reporting person type
- HC
- Group designation
- b
- Aggregate amount owned
- 1,664,459
- Percent of class
- 4.5
- Sole voting power
- 1,521,301
- Shared voting power
- 0
- Sole dispositive power
- 1,664,459
- Shared dispositive power
- 0
Item 1
Issuer
QUANTINUUM INC
Principal executive office address
303 S Technology Court Broomfield CO 80021
Item 2
Citizenship
See Item 4 of Cover Page
Filing person
BlackRock Portfolio Management LLC In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
Principal business or residence address
BlackRock Portfolio Management LLC, 50 Hudson Yards New York, NY 10001
Item 3
Not applicable indication
N
Item 4
Percent of class
4.5
Amount beneficially owned
1664459
Sole voting power
1521301
Shared voting power
0
Sole dispositive power
1664459
Shared dispositive power
0
Item 5
Not applicable indication
N
Ownership of 5% or less
Y
Item 6
Not applicable indication
N
Ownership on behalf of another person
Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of QUANTINUUM INC. No one person's interest in the common stock of QUANTINUUM INC is more than five percent of the total outstanding common shares.
Item 7
Not applicable indication
N
Subsidiaries
See Exhibit 99
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 24: Power of Attorney Exhibit 99: Item 7
Signature 1
- Reporting person
- BlackRock Portfolio Management LLC
- Signed
- Spencer Fleming
- Title
- Managing Director
- Date
- 10/27/2026
Filed exhibits
- EXHIBIT 24: POWER OF ATTORNEY ↗PowerOfAttorney.txt
- EXHIBIT 99: ITEM 7 ↗Item_7.txt
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
Recent company filings
- SCHEDULE 13G - filed by CITADEL ADVISORS LLC regarding Quantinuum Inc.Oct 6, 2026
- Entry into a Material Definitive Agreement · Unregistered Sales of Equity Securities · Regulation FD DisclosureSep 8, 2026
- 10-Q filingAug 13, 2026
- Results of Operations and Financial Condition · Regulation FD DisclosureAug 11, 2026
- 4/A filingJul 22, 2026