Who owns Quartzsea Acquisition (QSEA)
Which tracked institutional funds hold QSEA, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See QSEA company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-14). 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
4 tracked funds added or opened QSEA while 11 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
QSEA’s largest tracked holder by dollar value, Harraden Circle Investments, LLC, sizes it at 3.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 3.2pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in QSEA 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 2026-Q1 and 2026-Q2, across 24 tracked filers holding QSEA, 9 increased or opened the position and 16 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 QSEA between the 2026-Q1 and 2026-Q2 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.
Full exits 5
- Harraden Circle Investments, LLC$408M
- GLAZER CAPITAL, LLC$2M
- Crossingbridge Advisors, LLC$1M
- TWO SIGMA INVESTMENTS, LP$615K
- Logan Stone Capital, LLC$535K
Largest adds
- BERKLEY W R CORP$7M
- Westchester Capital Management, LLC$3M
- RLH Capital LLC$2M
- Polar Asset Management Partners Inc.$336K
Largest trims
- Karpus Management, Inc.$13M
- MANGROVE PARTNERS IM, LLC$4M
- Linden Advisors LP$2M
- WOLVERINE ASSET MANAGEMENT LLC$1M
- Shaolin Capital Management LLC$588K
- TORONTO DOMINION BANK$490K
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 added | 1,094,190 | $12M | 2.4% | 2026-Q2 |
| Karpus Management, Inc. trimmed | 974,765 | $10M | 2.1% | 2026-Q2 |
| MIZUHO SECURITIES USA LLC | 677,754 | $7M | 1.4% | 2026-Q2 |
| Westchester Capital Management, LLC added | 611,605 | $6M | 1.3% | 2026-Q2 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC trimmed | 499,664 | $5M | 1.1% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC trimmed | 495,488 | $5M | 1.1% | 2026-Q2 |
| Polar Asset Management Partners Inc. added | 375,000 | $4M | 0.8% | 2026-Q2 |
| AQR Arbitrage LLC added | 356,213 | $4M | 0.8% | 2026-Q2 |
| RLH Capital LLC added | 252,439 | $3M | 0.6% | 2026-Q2 |
| Hudson Bay Capital Management LP added | 175,159 | $2M | 0.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 171,612 | $2M | 0.4% | 2026-Q2 |
| TORONTO DOMINION BANK trimmed | 150,000 | $2M | 0.3% | 2026-Q2 |
| Clear Street Group Inc. trimmed | 128,529 | $1M | 0.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC | 119,661 | $1M | 0.3% | 2026-Q2 |
| Shaolin Capital Management LLC trimmed | 114,840 | $1M | 0.3% | 2026-Q2 |
| Dakota Wealth Management trimmed | 49,760 | $523K | 0.1% | 2026-Q2 |
| Warberg Asset Management LLC added | 22,916 | $241K | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 16,987 | $179K | 0.0% | 2026-Q2 |
| CITADEL ADVISORS LLC new | 10,948 | $115K | 0.0% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC | 408,154 | $90K | 0.0% | 2026-Q2 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC trimmed | 382,957 | $84K | 0.0% | 2026-Q2 |
| Linden Advisors LP | 175,000 | $33K | 0.0% | 2026-Q2 |
| UBS Group AG | 2,000 | $21K | 0.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 61 | $642 | 0.0% | 2026-Q2 |
| Harraden Circle Investments, LLC | 2,548,048 | $408M | 84.7% | 2026-Q1 stale (1 quarter behind) |
| GLAZER CAPITAL, LLC trimmed | 149,544 | $2M | 0.3% | 2026-Q1 stale (1 quarter behind) |
| Crossingbridge Advisors, LLC | 140,189 | $1M | 0.3% | 2026-Q1 stale (1 quarter behind) |
| TWO SIGMA INVESTMENTS, LP trimmed | 59,288 | $615K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Logan Stone Capital, LLC added | 51,553 | $535K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Radcliffe Capital Management, L.P. | 26,553 | $275K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Wellspring Financial Advisors, LLC | 17,700 | $184K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| JPMORGAN CHASE & CO new | 400,000 | $64K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Alpine Global Management, LLC trimmed | 31,374 | $6K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| CLEAR STREET LLC trimmed | 146,818 | $2M | 0.3% | 2025-Q2 stale (4 quarters behind) |
| Virtu Financial LLC new | 95,248 | $957K | 0.2% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
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.