Who owns Quantinuum Inc, from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Honeywell International Inc.: 79.1% · 124,628,729 shares — Honeywell Holdings International Inc.: 46.6% · 28,630,074 shares
Capital Research Global Investors: 5.3% · 1,754,325 shares
3 more 5% stakes behind a free account
See every investor who has disclosed crossing 5% of Quantinuum Inc.
Sign up freeEvery institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Quantinuum Inc they hold. Together these 173 managers report 100.25% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| Capital World Investors | $373M | 4,558,976 | 0.04% | 13.44% | June 30, 2026 |
| CITADEL ADVISORS LLC | $188M | 2,299,997 | 0.02% | 6.78% | June 30, 2026 |
171 more institutional holders behind a free account
See every manager reporting Quantinuum Inc, how much of the company they hold, and how big the position is inside their own portfolio.
Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 57 funds hold 20.97% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| Asset Allocation Fund | $156M | 0.55% | 5.64% | June 30, 2026 |
| Defiance Quantum ETF | $98.1M | 1.57% | 3.54% | June 30, 2026 |
55 more funds behind a free account
See every fund holding Quantinuum Inc and what share of its net assets the position represents.
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