Quartzsea Acquisition Corp
QSEA- 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; 21 institutions reported holding it in 13F filings for Q2 2026, worth $70.9M in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Quartzsea Acquisition Corp as of Sep 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
- 25
- +2 vs. Q2 2025
- Shares held
- 7.47M
- +558.7K (+8.1%) vs. Q2 2025
- Total value
- $74.3M
- +$4.95M (+7.1%) vs. Q2 2025
- New holders
- 3
- 5 more added
- Sold out
- 1
- 6 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting QSEA 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 | 21 | $70.9M |
| Q1 2026 | 26 | $78.0M |
| Q4 2025 | 25 | $75.4M |
| Q3 2025 | 25 | $74.3M |
| Q2 2025 | 24 | $69.7M |
| Q1 2025 | 0 | $0 |
| 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, Q3 2025
Shares, value and share of portfolio for each institution holding Quartzsea Acquisition Corp; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Karpus Management, Inc. | 2,276,380 | $23.1M | 0.73% | −24,095−1.0% | Reduced |
| Mizuho Securities USA LLC | 641,777 | $6.43M | 0.13% | +184,640+40.4% | Added |
| Wolverine Asset Management LLC | 584,505 | $5.92M | 0.09% | +51,180+9.6% | Added |
| Mangrove Partners | 408,154 | $4.13M | 0.34% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 397,500 | $4.03M | 0.23% | +397,500 | New |
| CNH Partners LLC | 369,960 | $3.76M | 0.10% | −7,379−2.0% | Reduced |
| Westchester Capital Management, LLC | 366,605 | $3.72M | 0.19% | 00.0% | Unchanged |
| Polar Asset Management Partners Inc. | 350,000 | $3.55M | 0.07% | 00.0% | Unchanged |
| Berkley W R Corp | 288,603 | $2.92M | 0.19% | +139,365+93.4% | Added |
| Toronto Dominion Bank | 266,975 | $2.70M | 0.01% | −13,120−4.7% | Reduced |
| Two Sigma Investments, LP | 184,128 | $1.87M | 0.00% | −76,871−29.5% | Reduced |
| Linden Advisors LP | 175,000 | $1.78M | 0.01% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 175,000 | $1.78M | 0.01% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 175,000 | $1.77M | 0.08% | −48,637−21.7% | Reduced |
| D. E. Shaw & Co., Inc. | 170,012 | $1.73M | 0.00% | 00.0% | Unchanged |
| Glazer Capital, LLC | 163,753 | $1.66M | 0.06% | −1,247−0.8% | Reduced |
| Goldman Sachs Group Inc | 119,661 | $1.21M | 0.00% | 00.0% | Unchanged |
| Dakota Wealth Management | 69,500 | $704.0K | 0.01% | 00.0% | Unchanged |
| Logan Stone Capital, LLC | 50,053 | $507.0K | 0.23% | 00.0% | Unchanged |
| Radcliffe Capital Management, L.P. | 26,553 | $269.0K | 0.02% | 00.0% | Unchanged |
| Clear Street Group Inc. | 24,693 | $250.1K | 0.00% | +24,693 | New |
| Warberg Asset Management LLC | 24,000 | $243.1K | 0.07% | 00.0% | Unchanged |
| Wellspring Financial Advisors, LLC | 17,700 | $179.3K | 0.02% | +17,700 | New |
| Crossingbridge Advisors, LLC | 140,189 | $140.2K | 0.07% | +10,189+7.8% | Added |
| Morgan Stanley | 31 | $314 | 0.00% | +5+19.2% | Added |
| Virtu Financial LLC | 0 | $0 | 0.00% | −95,248−100.0% | Sold out |
| Clear Street LLC | – | – | – | – | Not filed |