Who owns Keystone Acquisition Corp., 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.
MAGNETAR FINANCIAL LLC: 7.0% · 2,000,000 shares — MAGNETAR CAPITAL PARTNERS LP: 7.0% · 2,000,000 shares — SUPERNOVA MANAGEMENT LLC: 7.0% · 2,000,000 shares
AQR Capital Management, LLC: 6.0% · 1,723,275 shares — AQR Capital Management Holdings, LLC: 6.0% · 1,723,275 shares — AQR Arbitrage, LLC: 6.0% · 1,723,275 shares
Every 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 Keystone Acquisition Corp. they hold.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| Magnetar Financial LLC | $20.1M | 2,000,000 | 0.18% | — | June 30, 2026 |
| AQR Arbitrage LLC | $17.3M | 1,723,275 | 0.25% | — | June 30, 2026 |
49 more institutional holders behind a free account
See every manager reporting Keystone Acquisition Corp., 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.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| RiverNorth Opportunities Fund Inc. | $1M | 0.30% | — | June 30, 2026 |
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