Quartzsea Acquisition Corp
QSEAU- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002047455
No open-market purchases or sales by Quartzsea Acquisition Corp insiders were filed in the last 90 days; 2 institutions reported holding it in 13F filings for Q2 2026, worth $321.2K in total; no superinvestor holds it.
13F holders, Q2 2025
Institutional positions in Quartzsea Acquisition Corp as of Jun 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 3
- −16 vs. Q1 2025
- Shares held
- 648.8K
- −4.58M (−87.6%) vs. Q1 2025
- Total value
- $6.68M
- −$46.1M (−87.4%) vs. Q1 2025
- New holders
- 0
- 1 more added
- Sold out
- 16
- 1 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting QSEAU on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 2 | $321.2K |
| Q1 2026 | 2 | $1.67M |
| Q4 2025 | 2 | $1.65M |
| Q3 2025 | 3 | $2.68M |
| Q2 2025 | 3 | $6.68M |
| Q1 2025 | 20 | $61.4M |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2025
Shares, value and share of portfolio for each institution holding Quartzsea Acquisition Corp; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Rivernorth Capital Management, LLC | 500,000 | $5.15M | 0.28% | 00.0% | Unchanged |
| Clear Street LLC | 146,818 | $1.51M | 0.01% | −53,182−26.6% | Reduced |
| UBS Group AG | 2,000 | $20.6K | 0.00% | +1+0.1% | Added |
| Harraden Circle Investments, LLC | 0 | $0 | 0.00% | −1,075,789−100.0% | Sold out |
| CNH Partners LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Mangrove Partners | 0 | $0 | 0.00% | −408,154−100.0% | Sold out |
| Polar Asset Management Partners Inc. | 0 | $0 | 0.00% | −350,000−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −305,000−100.0% | Sold out |
| Glazer Capital, LLC | 0 | $0 | 0.00% | −294,067−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −260,999−100.0% | Sold out |
| Shaolin Capital Management LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Crossingbridge Advisors, LLC | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| Linden Advisors LP | 0 | $0 | 0.00% | −175,000−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −175,000−100.0% | Sold out |
| D. E. Shaw & Co., Inc. | 0 | $0 | 0.00% | −170,000−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Berkley W R Corp | 0 | $0 | 0.00% | −148,740−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −40,000−100.0% | Sold out |
| Warberg Asset Management LLC | 0 | $0 | 0.00% | −24,000−100.0% | Sold out |
| Mizuho Securities USA LLC | – | – | – | – | Not filed |