Who owns Cayson Acquisition Corp Ordinary shares (CAPN)
Which tracked institutional funds hold CAPN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CAPN company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-15). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on CAPN is one-sided between 2025-Q4 and 2026-Q1: 3 added or opened and 14 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CAPN’s largest tracked holder by dollar value, MIZUHO SECURITIES USA LLC, sizes it at 0.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CAPN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 16 tracked filers holding CAPN, 7 increased or opened the position and 21 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CAPN between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 2
- Shaolin Capital Management LLC$2M
- RLH Capital LLC$1M
Full exits 9
- Westchester Capital Management, LLC$3M
- BOOTHBAY FUND MANAGEMENT, LLC$3M
- Karpus Management, Inc.$3M
- WHITEBOX ADVISORS LLC$1M
- D. E. Shaw & Co., Inc.$1M
- Magnetar Financial LLC$800K
Largest adds
- Clear Street Group Inc.$413K
Largest trims
- WOLVERINE ASSET MANAGEMENT LLC$3M
- BERKLEY W R CORP$3M
- MIZUHO SECURITIES USA LLC$2M
- AQR Arbitrage LLC$2M
- GOLDMAN SACHS GROUP INC$521K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BERKLEY W R CORP trimmed | 497,282 | $5M | 8.5% | 2026-Q1 |
| MIZUHO SECURITIES USA LLC trimmed | 475,900 | $5M | 8.0% | 2026-Q1 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 450,000 | $5M | 7.7% | 2026-Q1 |
| Westchester Capital Management, LLC | 325,000 | $3M | 5.4% | 2025-Q4 |
| BOOTHBAY FUND MANAGEMENT, LLC | 306,703 | $3M | 5.1% | 2025-Q4 |
| WOLVERINE ASSET MANAGEMENT LLC trimmed | 275,700 | $3M | 4.7% | 2026-Q1 |
| Polar Asset Management Partners Inc. | 275,000 | $3M | 4.7% | 2026-Q1 |
| Karpus Management, Inc. trimmed | 284,189 | $3M | 4.7% | 2025-Q4 |
| Shaolin Capital Management LLC added | 223,900 | $2M | 3.8% | 2026-Q1 |
| AQR Arbitrage LLC trimmed | 184,373 | $2M | 3.1% | 2026-Q1 |
| HEIGHTS CAPITAL MANAGEMENT, INC | 150,000 | $2M | 2.6% | 2026-Q1 |
| Clear Street Group Inc. added | 141,837 | $2M | 2.4% | 2026-Q1 |
| WHITEBOX ADVISORS LLC | 125,000 | $1M | 2.1% | 2025-Q4 |
| RLH Capital LLC new | 106,218 | $1M | 1.8% | 2026-Q1 |
| D. E. Shaw & Co., Inc. | 100,000 | $1M | 1.7% | 2025-Q4 |
| Magnetar Financial LLC | 75,000 | $800K | 1.2% | 2025-Q4 |
| First Trust Capital Management L.P. | 75,000 | $798K | 1.2% | 2025-Q4 |
| TWO SIGMA INVESTMENTS, LP trimmed | 66,577 | $708K | 1.1% | 2025-Q4 |
| GOLDMAN SACHS GROUP INC trimmed | 63,394 | $697K | 1.1% | 2026-Q1 |
| PNC Financial Services Group, Inc. | 60,281 | $641K | 1.0% | 2025-Q4 |
| Dakota Wealth Management | 28,500 | $303K | 0.5% | 2025-Q4 |
| Harraden Circle Investments, LLC new | 26,661 | $293K | 0.5% | 2026-Q1 |
| Radcliffe Capital Management, L.P. trimmed | 26,875 | $286K | 0.4% | 2025-Q4 |
| Warberg Asset Management LLC added | 26,207 | $279K | 0.4% | 2025-Q4 |
| TORONTO DOMINION BANK trimmed | 25,301 | $269K | 0.4% | 2025-Q4 |
| Quarry LP | 14,500 | $160K | 0.2% | 2026-Q1 |
| ROBINSON CAPITAL MANAGEMENT, LLC | 12,250 | $131K | 0.2% | 2025-Q4 |
| BNP PARIBAS FINANCIAL MARKETS new | 9,203 | $101K | 0.2% | 2026-Q1 |
| Crossingbridge Advisors, LLC trimmed | 8,643 | $92K | 0.1% | 2025-Q4 |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 470 | $5K | 0.0% | 2025-Q4 |
| UBS Group AG trimmed | 370 | $4K | 0.0% | 2026-Q1 |
| MORGAN STANLEY added | 68 | $748 | 0.0% | 2026-Q1 |
| MIZUHO SECURITIES USA LLC added | 704,000 | $7M | 11.0% | 2025-Q1 stale |
| ATW SPAC MANAGEMENT LLC | 306,703 | $3M | 5.0% | 2025-Q3 stale |
| Bulldog Investors, LLP trimmed | 224,750 | $2M | 3.6% | 2025-Q1 stale |
| Schechter Investment Advisors, LLC trimmed | 124,300 | $1M | 2.0% | 2025-Q1 stale |
| Logan Stone Capital, LLC new | 116,406 | $1M | 1.9% | 2025-Q2 stale |
| Wealthspring Capital LLC trimmed | 59,550 | $623K | 1.0% | 2025-Q3 stale |
| METEORA CAPITAL, LLC trimmed | 17,500 | $178K | 0.3% | 2025-Q1 stale |
| Evercore Wealth Management, LLC | 13,000 | $133K | 0.2% | 2025-Q1 stale |
| CLEAR STREET LLC added | 12,155 | $125K | 0.2% | 2025-Q2 stale |
| TWO SIGMA SECURITIES, LLC new | 10,512 | $107K | 0.2% | 2025-Q1 stale |
| OSAIC HOLDINGS, INC. | 250 | $3K | 0.0% | 2025-Q3 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.