Citadel's passive 7.3% stake signals institutional conviction but no activist intent. Monitor for any future conversion to a 13D or increased position, which would indicate a shift in strategy.
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Executive Summary
Citadel Advisors LLC and affiliates, including Kenneth Griffin, filed a Schedule 13G disclosing a combined 7.3% passive stake in Quantinuum Inc. as of June 30, 2026. The filing indicates no intent to influence control, consistent with a passive investment. This is a new 13G filing for Citadel, adding to prior passive filings by Honeywell and Capital World Investors.
Key Financial Metrics
Key Facts
- Citadel Advisors LLC and affiliates collectively beneficially own 2,403,427 shares of Quantinuum Class A common stock, representing 7.3% of shares outstanding.
- The stake is held via Citadel Multi-Strategy Equities Master Fund Ltd. (2,299,997 shares, 7.0%) and Citadel Securities LLC (103,430 shares, 0.3%).
- The filing is made under Rule 13d-1(b), confirming passive intent with no control influence.
- Shares outstanding used for calculation: 32,862,895 as of June 5, 2026.
- This is a new 13G filing for Citadel; prior passive stakes were filed by Honeywell (August 2026) and Capital World Investors (July 2026).
Financial Impact
Passive stake of 7.3% — no direct financial impact from the filing itself.
Risk Factors
- Citadel could convert to an activist 13D filing, though no indication currently.
- Large passive stake may overhang if Citadel decides to reduce position.
Documents Analyzed
This report is based on 4 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G Filing (Primary) | 0001104659-26-114121 |
| Document: 0001104659-26-114121-index-headers.html | 0001104659-26-114121 |
| Document: 0001104659-26-114121-index.html | 0001104659-26-114121 |
| Document: 0001104659-26-114121.txt | 0001104659-26-114121 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 6, 2026 20d ago | SC 13G | $44.22 | awaiting T+20 | — | $39.25 (−11.24%) |
Aug 16, 2026 10w ago | Institutional Cluster | $66.01 $49.10 | ▼ −25.62% | ▼ −24.09% | $39.25 (−40.54%) |
Jul 27, 2026 13w ago | Press Release | $49.78 $53.89 | ▲ +8.26% | ▲ +4.88% | $39.25 (−21.15%) |
Jun 8, 2026 20w ago | Insider Buy | $54.94 $77.60 | ▲ +41.24% | ▲ +39.80% | $39.25 (−28.56%) |
Jun 8, 2026 20w ago | Insider Cluster | $54.94 $77.60 | ▲ +41.24% | ▲ +39.80% | $39.25 (−28.56%) |
Jun 4, 2026 20w ago | 3 | $56.26 $83.17 | ▲ +47.83% | ▲ +45.97% | $39.25 (−30.23%) |
Jun 4, 2026 20w ago | 3 | $56.26 $83.17 | ▲ +47.83% | ▲ +45.97% | $39.25 (−30.23%) |
Jun 4, 2026 20w ago | EFFECT | $60.38 $74.56 | ▲ +23.48% | ▲ +24.86% | $39.25 (−35.00%) |
Jun 1, 2026 21w ago | S-1/A | — | awaiting T+20 | — | — |
May 26, 2026 22w ago | S-1/A | — | awaiting T+20 | — | — |
US Market Status
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