QSEA · Quartzsea Acquisition Corp
$10.64
At close · Sep 2
Going-concern doubt
— flagged Jul 14, 2026
Substantial doubt about the company's ability to continue as a going concern.
“Management concluded that, due to the Company's liquidity condition and requirement to complete a business combination within the prescribed period to avoid liquidation, substantial doubt exists about the Company's ability to continue as a going concern.”View the 10-Q filed Jul 14, 2026
Market Cap
$107.53M
Shares
10.13M
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 26
Total Value: $70,904,999
Total Shares: 13,147,964
Institutional Ownership Trend
6 quarters
Holder Concentration
Across 26 13F filers · Δ vs Mar 31, 2026Top Holder
16.2%
−13.7 pts
Top 5
61.9%
+2.9 pts
Top 10
86.5%
+5.2 pts
HHI
986
Broadly held−267
Quarterly Activity
vs Mar 31, 2026
New
1
Increased
9
Decreased
12
Sold Out
5
Unchanged
4
Holder count:
-4
Institutional value:
-9.2%
Shares held:
-7.7%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mid BERKLEY W R CORP | +688,641 | 1,094,190 | |
| Mid MIZUHO SECURITIES USA LLC | +305,307 | 993,296 | |
| Mid Westchester Capital Management, LLC | +245,000 | 611,605 | |
| Small RLH Capital LLC | +211,100 | 252,439 | |
| Large Clear Street Group Inc. | +131,022 | 424,816 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid Karpus Management, Inc. | −1,282,040 | 974,765 | |
| Mid MANGROVE PARTNERS IM, LLC | −408,154 | 408,154 | |
| Mid Linden Advisors LP | −175,000 | 175,000 | |
| Mid WOLVERINE ASSET MANAGEMENT LLC | −146,792 | 569,600 | |
| Large TORONTO DOMINION BANK | −139,851 | 486,000 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | 10,948 | $115,172 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Small Crossingbridge Advisors, LLC | 140,189 | $1,453,759 | |
| Mega TWO SIGMA INVESTMENTS, LP | 59,288 | $614,816 | |
| Small Logan Stone Capital, LLC | 51,553 | $534,604 | |
| Small Radcliffe Capital Management, L.P. | 26,553 | $275,354 | |
| Mid Wellspring Financial Advisors, LLC | 17,700 | $183,549 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mid BERKLEY W R CORP | $11,510,878 | 16.23% | 1,094,190 | Shares | 2026-08-14 | |
| Mid MIZUHO SECURITIES USA LLC Broker-Dealer | $10,449,473 | 14.74% | 993,296 | Shares | 2026-07-28 | |
| Mid Karpus Management, Inc. | $10,254,527 | 14.46% | 974,765 | Shares | 2026-08-14 | |
| Mid Westchester Capital Management, LLC | $6,434,083 | 9.07% | 611,605 | Shares | 2026-08-14 | |
| Mid RIVERNORTH CAPITAL MANAGEMENT, LLC | $5,256,465 | 7.41% | 499,664 | Shares | 2026-08-14 | |
| Mid WOLVERINE ASSET MANAGEMENT LLC | $5,212,533 | 7.35% | 495,488 | Shares | 2026-08-10 | |
| Mid Polar Asset Management Partners Inc. | $3,945,000 | 5.56% | 375,000 | Shares | 2026-08-14 | |
| Mid AQR Arbitrage LLC | $3,747,360 | 5.29% | 356,213 | Shares | 2026-08-14 | |
| Small RLH Capital LLC | $2,655,658 | 3.75% | 252,439 | Shares | 2026-08-10 | |
| Large Hudson Bay Capital Management LP | $1,842,672 | 2.60% | 175,159 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $1,805,358 | 2.55% | 171,612 | Shares | 2026-08-14 | |
| Large TORONTO DOMINION BANK Bank | $1,578,000 | 2.23% | 150,000 | Shares | 2026-08-14 | |
| Large Clear Street Group Inc. | $1,352,125 | 1.91% | 128,529 | Shares | 2026-08-12 | |
| Mid GLAZER CAPITAL, LLC | $1,334,851 | 1.88% | 126,887 | Shares | 2026-08-17 | |
| Mega GOLDMAN SACHS GROUP INC | $1,258,833 | 1.78% | 119,661 | Shares | 2026-08-14 | |
| Small Shaolin Capital Management LLC | $1,208,116 | 1.70% | 114,840 | Shares | 2026-08-14 | |
| Mid Dakota Wealth Management | $523,475 | 0.74% | 49,760 | Shares | 2026-08-07 | |
| Small Warberg Asset Management LLC | $241,076 | 0.34% | 22,916 | Shares | 2026-08-11 | |
| Mega BNP PARIBAS ARBITRAGE, SA | $178,703 | 0.25% | 16,987 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC | $115,172 | 0.16% | 10,948 | Shares | 2026-09-02 | |
| Mega MORGAN STANLEY | $641 | 0.00% | 61 | Shares | 2026-08-13 | |
| Large TORONTO DOMINION BANK Bank QSEAR | — | — | 336,000 | Shares | 2026-08-14 | |
| Mid HIGHBRIDGE CAPITAL MANAGEMENT LLC QSEAR | — | — | 382,957 | Shares | 2026-08-14 | |
| Mid WOLVERINE ASSET MANAGEMENT LLC QSEAR | — | — | 74,112 | Shares | 2026-08-10 | |
| Mid RIVERNORTH CAPITAL MANAGEMENT, LLC QSEAR | — | — | 499,872 | Shares | 2026-08-14 | |
| Large Hudson Bay Capital Management LP QSEAR | — | — | 100,000 | Shares | 2026-08-14 | |
| Large Clear Street Group Inc. QSEAR | — | — | 268,292 | Shares | 2026-08-12 | |
| Large Clear Street Group Inc. QSEAU | — | — | 27,995 | Shares | 2026-08-12 | |
| Mid Polar Asset Management Partners Inc. QSEAR | — | — | 350,000 | Shares | 2026-08-14 | |
| Mid MANGROVE PARTNERS IM, LLC QSEAR | — | — | 408,154 | Shares | 2026-08-14 | |
| Mega UBS Group AG QSEAU | — | — | 2,000 | Shares | 2026-08-13 | |
| Mega D. E. Shaw & Co., Inc. QSEAR | — | — | 170,000 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA QSEAR | — | — | 119,661 | Shares | 2026-08-13 | |
| Mid Linden Advisors LP QSEAR | — | — | 175,000 | Shares | 2026-08-14 | |
| Mid AQR Arbitrage LLC QSEAR | — | — | 370,460 | Shares | 2026-08-14 | |
| Small Shaolin Capital Management LLC QSEAR | — | — | 575,393 | Shares | 2026-08-14 | |
| Small Harraden Circle Investments, LLC QSEAR | — | — | 2,548,048 | Shares | 2026-08-14 |