Monitor for further 13G amendments or a potential 13D conversion if BlackRock increases its stake above 5% again. The reduction below 5% removes BlackRock from 5% holder status, reducing passive ownership concentration.
Price Chart
Executive Summary
BlackRock Portfolio Management LLC filed an amended Schedule 13G disclosing a 4.5% passive stake in Quantinuum Inc. as of September 30, 2026, down from the prior 7.3% stake reported by Citadel Advisors in October 2026. The filing indicates BlackRock's stake is now below the 5% threshold, signaling a reduction in its passive position.
Key Financial Metrics
Key Facts
- BlackRock Portfolio Management LLC reported beneficial ownership of 1,664,459 shares of Quantinuum Class A Stock as of September 30, 2026.
- The stake represents 4.5% of outstanding shares, down from a prior 7.3% passive stake disclosed by Citadel Advisors in October 2026.
- The filing is an amendment to Schedule 13G, indicating a passive investment with no intent to influence control.
- BlackRock's filing includes a list of 17 affiliated entities, none of which individually own 5% or more of the outstanding shares.
Financial Impact
BlackRock's stake decreased from above 5% to 4.5%, representing a reduction of approximately 2.8 percentage points or about 1.1 million shares based on the prior 7.3% stake and current market cap of $9.7B.
Risk Factors
- BlackRock's reduction below 5% could signal reduced institutional confidence, though the filing is passive and routine.
- No explicit reason for the stake decrease is provided; the filing is an administrative update as of September 30, 2026.
Market Snapshot
Documents Analyzed
This report is based on 5 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G/A Filing (Primary) | 0002052113-26-001105 |
| Document: Item_7.txt | 0002052113-26-001105 |
| Document: 0002052113-26-001105-index-headers.html | 0002052113-26-001105 |
| Document: 0002052113-26-001105-index.html | 0002052113-26-001105 |
| Document: 0002052113-26-001105.txt | 0002052113-26-001105 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 27, 2026 5d ago | SC 13G/A | $38.33 | awaiting T+20 | awaiting T+20 | $33.60 (−12.34%) |
Oct 6, 2026 26d ago | SC 13G | $44.22 | awaiting T+20 | awaiting T+20 | $33.60 (−24.02%) |
Aug 16, 2026 11w ago | Institutional Cluster | $66.01 $49.10 | ▼ −25.62% | ▼ −24.09% | $33.60 (−49.10%) |
Jul 27, 2026 13w ago | Press Release | $49.78 $53.89 | ▲ +8.26% | ▲ +4.88% | $33.60 (−32.50%) |
Jun 8, 2026 20w ago | Insider Buy | $54.94 $77.60 | ▲ +41.24% | ▲ +39.80% | $33.60 (−38.84%) |
Jun 8, 2026 20w ago | Insider Cluster | $54.94 $77.60 | ▲ +41.24% | ▲ +39.80% | $33.60 (−38.84%) |
Jun 4, 2026 21w ago | 3 | $56.26 $83.17 | ▲ +47.83% | ▲ +45.97% | $33.60 (−40.28%) |
Jun 4, 2026 21w ago | 3 | $56.26 $83.17 | ▲ +47.83% | ▲ +45.97% | $33.60 (−40.28%) |
Jun 4, 2026 21w ago | EFFECT | $60.38 $74.56 | ▲ +23.48% | ▲ +24.86% | $33.60 (−44.35%) |
Jun 1, 2026 21w ago | S-1/A | No price | awaiting T+20 | awaiting T+20 | No price |
US Market Status
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