Quartzsea Acquisition QSEA Institutional Ownership

NASDAQ QSEA

$10.71 -0.03 (-0.28%)

At close: Oct 22, 2026 · 4:00 PM EDT

Institutions by Trading Activity

21 Institutions

Increased 10 47.6%

Unchanged 3 14.3%

Reduced 8 38.1%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

32.63%

▼-33.36 pp QoQ

Shares Held by Institutions

6.42Mn

of 19.69Mn outstanding

▼-14.68% QoQ

Shares Outstanding

19.69Mn

13.27Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▼-5 vs prior quarter

Net Shares Added (QoQ)

-1.10Mn

distributed since last quarter

Value of Holdings

$68.81Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 5, 2026

Quartzsea Acquisition Corp (NASDAQ:QSEA) was reported as a holding by 21 institutional investors in 13F filings for the quarter ended June 30, 2026.

Together they owned 32.63% of the outstanding stock in Q2 2026, down from 65.99% a quarter earlier.
Total shares held in Quartzsea Acquisition fell 14.68% from Q1 2026, while the number of holders fell 8.70% from Q2 2025.
Looking at the 21 holders of QSEA individually, 10 added to their positions, 8 reduced their stakes and 3 left their positions unchanged.
In total, institutional investors held 6.42Mn shares of Quartzsea Acquisition at the end of Q2 2026, down 1.1Mn from the prior quarter and down 513.53K from a year earlier.
As of June 30, 2026, W. R. Berkley Corp held the largest stake in Quartzsea Acquisition with 1.09Mn shares, or 5.56% of shares outstanding.
Holders that added the most shares of Quartzsea Acquisition in Q2 2026 were W. R. Berkley Corp (+688.64K shares), Westchester Capital Management, LLC (+245K shares), RLH Capital LLC (+211.1K shares), Polar Asset Management Partners Inc. (+25K shares) and AQR Arbitrage LLC (+1.93K shares).
The biggest cuts to QSEA positions during Q2 2026 came from Karpus Management, Inc. (-1.28Mn shares), Wolverine Asset Management LLC (-104.03K shares), Shaolin Capital Management LLC (-61.75K shares), Toronto Dominion Bank (-50K shares) and Glazer Capital, LLC (-22.66K shares).
Per Business Quant, the top 10 investors in QSEA for the quarter ended June 30, 2026 were W. R. Berkley Corp (1.09Mn shares), Karpus Management, Inc. (974.76K shares), Mizuho Securities USA LLC (677.75K shares), Westchester Capital Management, LLC (611.61K shares), Rivernorth Capital Management, LLC (499.66K shares), Wolverine Asset Management LLC (495.49K shares), Polar Asset Management Partners Inc. (375K shares), AQR Arbitrage LLC (356.21K shares), RLH Capital LLC (252.44K shares) and Hudson Bay Capital Management LP (175.16K shares).

Form 13F Holdings

21 Institutional Holders

Report period 30 Jun, 2026

Total shares held 6.42Mn

Of outstanding 32.63%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Berkley W R Corp	0000011544	1,094,190	5.56%	▲688,641	+169.80%	$11.50Mn
2	Karpus Management, Inc.	0001048703	974,765	4.95%	▼1,282,040	-56.81%	$10.25Mn
3	MIZUHO SECURITIES USA LLC	0000812291	677,754	3.44%	0	0.00%	$6.95Mn
4	Westchester Capital Management, LLC	0001512805	611,605	3.11%	▲245,000	+66.83%	$6.43Mn
5	RIVERNORTH CAPITAL MANAGEMENT, LLC	0001447578	499,664	2.54%	▼92	-0.02%	$5.32Mn
6	WOLVERINE ASSET MANAGEMENT LLC	0001279891	495,488	2.52%	▼104,034	-17.35%	$5.21Mn
7	Polar Asset Management Partners Inc.	0001326389	375,000	1.90%	▲25,000	+7.14%	$3.95Mn
8	AQR Arbitrage LLC	0001167456	356,213	1.81%	▲1,925	+0.54%	$3.75Mn
9	RLH Capital LLC	0002008031	252,439	1.28%	▲211,100	+510.66%	$2.66Mn
10	Hudson Bay Capital Management LP	0001393825	175,159	0.89%	▲159	+0.09%	$1.84Mn
11	D. E. Shaw & Co., Inc.	0001009207	171,612	0.87%	▲1,500	+0.88%	$1.81Mn
12	Toronto Dominion Bank	0000947263	150,000	0.76%	▼50,000	-25.00%	$1.58Mn
13	Clear Street Group Inc.	0001881567	128,529	0.65%	▲128,529	0.00%	$1.35Mn
14	GLAZER CAPITAL, LLC	0001076809	126,887	0.64%	▼22,657	-15.15%	$1.34K
15	Goldman Sachs Group Inc	0000886982	119,661	0.61%	0	0.00%	$1.26Mn
16	Shaolin Capital Management LLC	0001766806	114,840	0.58%	▼61,746	-34.97%	$1.21Mn
17	Dakota Wealth Management	0001631353	49,760	0.25%	▼19,740	-28.40%	$523.48K
18	Warberg Asset Management LLC	0001597506	22,916	0.12%	▲965	+4.40%	$241.08K
19	BNP PARIBAS FINANCIAL MARKETS	0001166588	16,987	0.09%	0	0.00%	$178.70K
20	CITADEL ADVISORS LLC	0001423053	10,948	0.06%	▲10,948	0.00%	$115.17K

Showing 1 to 20 of 21 holders