Quartzsea Acquisition Corp (QSEA) — Institutional Holders, Q2 2026
26 institutional investment managers reported a QSEA position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $79.6M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
QSEA in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- MIZUHO SECURITIES USAAdded · +993,296 sh+$6.7M
- BERKLEY W RAdded · +688,641 sh+$4.7M
- Westchester Capital ManagementAdded · +245,000 sh+$1.7M
- RLH CapitalAdded · +211,100 sh+$1.4M
- Polar Asset Management PartnersAdded · +25,000 sh+$169.4K
Biggest sellers
- Karpus ManagementTrimmed · -1,282,040 sh-$8.7M
- WOLVERINE ASSET MANAGEMENTTrimmed · -146,792 sh-$994.8K
- Crossingbridge AdvisorsSold out · -140,189 sh-$950.0K
- TORONTO DOMINION BANKTrimmed · -139,851 sh-$947.7K
- GLAZER CAPITALTrimmed · -101,995 sh-$691.2K
QSEA 13F holders ranked 1–26 of 26
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | MIZUHO SECURITIES USA#1 · 1,681,285 sh | 1,681,285 | $17.3M | 0.17% | +144.4% |
| 2 | BERKLEY W R#2 · 1,094,190 sh | 1,094,190 | $11.5M | 0.55% | +169.8% |
| 3 | Karpus Management#3 · 974,765 sh | 974,765 | $10.3M | 0.29% | -56.8% |
| 4 | Westchester Capital Management#4 · 611,605 sh | 611,605 | $6.4M | 0.31% | +66.8% |
| 5 | RIVERNORTH CAPITAL MANAGEMENT#5 · 999,536 sh | 999,536 | $5.4M | 0.26% | 0.0% |
| 6 | WOLVERINE ASSET MANAGEMENT#6 · 569,600 sh | 569,600 | $5.2M | 0.05% | -20.5% |
| 7 | Polar Asset Management Partners#7 · 725,000 sh | 725,000 | $4.0M | 0.07% | +3.6% |
| 8 | AQR Arbitrage#8 · 726,673 sh | 726,673 | $3.8M | 0.05% | +0.3% |
| 9 | RLH Capital#9 · 252,439 sh | 252,439 | $2.7M | 1.27% | +510.7% |
| 10 | Hudson Bay Capital Management#10 · 275,159 sh | 275,159 | $1.9M | <0.01% | -21.4% |
| 11 | D. E. Shaw#11 · 341,612 sh | 341,612 | $1.8M | <0.01% | +0.4% |
| 12 | Clear Street Group#12 · 424,816 sh | 424,816 | $1.7M | <0.01% | +44.6% |
| 13 | TORONTO DOMINION BANK#13 · 486,000 sh | 486,000 | $1.7M | <0.01% | -22.3% |
| 14 | GLAZER CAPITAL#14 · 126,887 sh | 126,887 | $1.3M | 0.03% | -44.6% |
| 15 | Shaolin Capital Management#15 · 690,233 sh | 690,233 | $1.3M | 0.06% | -8.0% |
| 16 | GOLDMAN SACHS GROUP#16 · 119,661 sh | 119,661 | $1.3M | <0.01% | 0.0% |
| 17 | Harraden Circle Investments#17 · 2,548,048 sh | 2,548,048 | $560.6K | 0.07% | 0.0% |
| 18 | Dakota Wealth Management#18 · 49,760 sh | 49,760 | $523.5K | 0.01% | -28.4% |
| 19 | Warberg Asset Management#19 · 22,916 sh | 22,916 | $241.1K | 0.04% | +4.4% |
| 20 | BNP PARIBAS FINANCIAL MARKETS#20 · 136,648 sh | 136,648 | $205.0K | <0.01% | 0.0% |
| 21 | CITADEL ADVISORS#21 · 10,948 sh | 10,948 | $115.2K | 0.00% | New |
| 22 | MANGROVE PARTNERS IM#22 · 408,154 sh | 408,154 | $89.8K | <0.01% | -50.0% |
| 23 | HIGHBRIDGE CAPITAL MANAGEMENT#23 · 382,957 sh | 382,957 | $84.3K | <0.01% | -4.3% |
| 24 | LINDEN ADVISORS#24 · 175,000 sh | 175,000 | $33.1K | <0.01% | -50.0% |
| 25 | UBS Group AG#25 · 2,000 sh | 2,000 | $21.3K | 0.00% | 0.0% |
| 26 | MORGAN STANLEY#26 · 61 sh | 61 | $642.00 | 0.00% | -14.1% |
Funds that sold out of QSEA in Q2 2026 (5)
Held QSEA at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Crossingbridge Advisors140,189 sh | 140,189 | $1.5M |
| TWO SIGMA INVESTMENTS59,288 sh | 59,288 | $614.8K |
| Logan Stone Capital51,553 sh | 51,553 | $534.6K |
| Radcliffe Capital Management, L.P.26,553 sh | 26,553 | $275.4K |
| Wellspring Financial Advisors17,700 sh | 17,700 | $183.5K |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.