QSEAR · Quartzsea Acquisition Corp · Holdings

$0.25 +0.01 (+2.04%) At close · Oct 27

Market Cap

$108.55M

10.13M

Volume · Oct 27 105 Avg daily vol (3M) 1425

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.

Use institutional holdings through the 13F API or MCP → See every holder of QSEAR: 13F, 13D and 13G, insiders and funds →

Recent SEC filings are still being reconciled. Holder totals and changes may be incomplete until processing catches up.

Quarter:

Holders: 15

Total Value: $1,397,144

Total Shares: 6,388,184

Institutional Ownership Trend

5 quarters

Holder Concentration

Across 15 13F filers · Δ vs Mar 31, 2026

Top Holder

40.1%

+0.6 pts

Top 5

69.5%

+0.3 pts

Top 10

93.0%

+1.1 pts

HHI

1,961

Moderately concentrated+41

Who Holds QSEAR

Last 5 quarters through Jun 30, 2026

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026: 15 filers, like-for-like change -2.6%; actively managed books -2.6%.

Holder type	Share	Filers	Change	Exited
Registered adviser	85.8%	10	-3.7%	1
Bank	5.3%	1	-21.1%	0
Non-US	1.9%	1	0.0%	0
Broker-dealer	0.0%	0	—	0
Unknown	7.0%	3	+41.4%	0

Style	Share	Filers	Change	Exited
Systematic-like	8.1%	2	0.0%	0
Concentrated	4.2%	1	+95.8%	0
Diversified active	87.7%	12	-5.1%	1
Index-like	0.0%	0	—	0
Not measured	0.0%	0	—	0
Unknown	0.0%	0	—	0

Turnover	Share	Filers	Change	Exited
Low turnover	0.2%	1	0.0%	0
Medium turnover	15.7%	4	-14.4%	1
High turnover	80.0%	9	-2.5%	0
Unknown	4.2%	1	+95.8%	0
Not measured	0.0%	0	—	0

Holding horizon	Share	Filers	Change	Exited
Short horizon	79.5%	8	+0.7%	1
Medium horizon	0.2%	1	0.0%	0
Long horizon	9.8%	3	-12.6%	0
Unknown	10.6%	3	-14.9%	0
Not measured	0.0%	0	—	0

13F book size	Share	Filers	Change	Exited
Under $1B	48.9%	2	+0.1%	0
$1B to $10B	35.5%	8	-5.8%	1
$10B to $100B	11.0%	3	-4.5%	0
$100B or more	4.5%	2	0.0%	0
Not measured	0.0%	0	—	0

Client base	Share	Filers	Change	Exited
Pooled investment vehicles	78.0%	9	-4.1%	1
Registered funds and BDCs	7.8%	1	0.0%	0
Unknown	14.2%	5	+4.8%	0

Private funds	Share	Filers	Change	New	Exited
Hedge funds	85.8%	10	-3.7%	0	1
Unknown	14.2%	5	+4.8%	0	0

Location	Share	Filers	Change	New	Exited
United States	89.3%	13	-1.4%	0	1
Outside the US	10.7%	2	-11.6%	0	0

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

15 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

0.000% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.001%

Mar 31, 2026: 0

Crowding

—

shares outstanding is an issuer-wide count, not one listing's

Private-fund advisers

—

of shares outstanding

Institutional ownership

—

shares outstanding is an issuer-wide count, not one listing's

Top 10 holders

92.6%

of 13F shares, Herfindahl 0.194

Active holders

-2.6%

like-for-like share change of active filers

5% stakes on record

0 13D, 0 13G

How long holders have held it value-weighted 4.8 quarters

Under 1 year 1.88% 1 to 3 years 98.1% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Shared Holders

Companies QSEAR's active holders also own, quarter ended Jun 30, 2026

#	Company	Shared holders	Similarity
1	RIBB Ribbon Acquisition Corp.	4	0.632
2	NMP NMP Acquisition Corp.	6	0.612
3	QUMS Quantumsphere Acquisition Corp	6	0.612
4	IPEX Inflection Point Acquisition Corp. V	5	0.589
5	CAPN Cayson Acquisition Corp	4	0.577
6	CCAQ Collective Acquisition Corp.	7	0.568
7	SCII SC II Acquisition Corp.	7	0.540
8	UAC United Acquisition Corp. I	3	0.530
9	GIX GigCapital9 Corp.	7	0.495
10	KFII K&F Growth Acquisition Corp. II	7	0.495

Shareholder Targets

13F filers that own its peers but not QSEAR, quarter ended Jun 30, 2026

Found through its holder-overlap peers: RIBB, NMP, QUMS, IPEX, CAPN, CCAQ, SCII, UAC, GIX, KFII, KCHV, MYX, KOYN, TVAI, BKHA, CRAC, CHAR, SAGU, XSLL, XRPNU. 110 filers in all.

#	Filer	In peers	Of book	Largest peers
1	Magnetar Financial LLC Registered adviser, Concentrated	$109,133,050 13 held	1.08%	KCHV, CRAC, KFII
2	TENOR CAPITAL MANAGEMENT Co., L.P. Registered adviser, Diversified active	$102,443,000 10 held	6.45%	XRPNU, GIX, KFII
3	ARISTEIA CAPITAL, L.L.C. Registered adviser, Diversified active	$99,818,461 12 held	3.44%	XSLL, GIX, KCHV
4	Radcliffe Capital Management, L.P. Registered adviser, Diversified active	$62,276,188 17 held	6.58%	KOYN, KFII, KCHV
5	Arrington Capital Management, LLC Registered adviser, Concentrated	$60,513,320 1 held	67.1%	XRPNU
6	TWO SIGMA INVESTMENTS, LP Registered adviser, Systematic-like	$57,165,104 14 held	0.040%	KFII, KCHV, TVAI
7	MILLENNIUM MANAGEMENT LLC Registered adviser, Systematic-like	$51,290,683 9 held	0.040%	GIX, XSLL, TVAI
8	LMR Partners LLP Exempt adviser, Diversified active	$51,146,848 10 held	0.460%	KOYN, XRPNU, KFII
9	METEORA CAPITAL, LLC Adviser, Diversified active	$39,921,650 14 held	3.65%	XRPNU, TVAI, KFII
10	WHITEBOX ADVISORS LLC Registered adviser, Diversified active	$36,103,473 15 held	1.82%	MYX, SAGU, CHAR

Fund Ownership of QSEAR by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 0 shares.

Fund type	Shares	Funds
Index funds	0	0
Index ETFs	0	0
Active ETFs	2,372	1
Active funds	0	0
Unclassified	0	0
All registered funds	2,372	1

How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

New and Sold Out count only filers that reported a 13F for both quarters: a first-time filer's book is not a buy, and a fund that has not filed, or withheld its positions under confidential treatment, has not sold.

Holder count: -1

Institutional value: +35.6%

Shares held: -2.6%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Large Clear Street Group Inc.	+131,292	268,292
Mid Shaolin Capital Management LLC	+1,886	575,393
Mid AQR Arbitrage LLC	+500	370,460

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Large TORONTO DOMINION BANK	−89,851	336,000
Large Hudson Bay Capital Management LP	−75,000	100,000
Mid WOLVERINE ASSET MANAGEMENT LLC	−42,758	74,112
Mid HIGHBRIDGE CAPITAL MANAGEMENT LLC	−17,043	382,957

Top New Positions

vs Mar 31, 2026

No new positions this quarter.

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)	Open
Mid GLAZER CAPITAL, LLC	79,338	$9

Filter: New 0 Increased 3 Reduced 4 Sold out 1 Unchanged 8

Holder type: Registered adviser 10 Bank 1 Non-US 1 Unknown 3

Showing 15 of 15

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Harraden Circle Investments, LLC QSEAR

$560,571

40.12%

2,548,048

Shaolin Capital Management LLC QSEAR

$126,586

9.06%

575,393

RIVERNORTH CAPITAL MANAGEMENT, LLC QSEAR

$109,322

7.82%

499,872

MANGROVE PARTNERS IM, LLC QSEAR

$89,794

6.43%

408,154

HIGHBRIDGE CAPITAL MANAGEMENT LLC QSEAR

$84,251

6.03%

382,957

AQR Arbitrage LLC QSEAR

$81,501

5.83%

370,460

Polar Asset Management Partners Inc. QSEAR

$77,000

5.51%

350,000

TORONTO DOMINION BANK QSEAR

$73,920

5.29%

336,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	336,000	$73,920	100.0%	Defined

Clear Street Group Inc. QSEAR

$59,024

4.22%

268,292

D. E. Shaw & Co., Inc. QSEAR

$37,400

2.68%

170,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	170,000	$37,400	100.0%	Defined

Linden Advisors LP QSEAR

$33,145

2.37%

175,000

BNP PARIBAS ARBITRAGE, SA QSEAR

$26,325

1.88%

119,661

Hudson Bay Capital Management LP QSEAR

$22,000

1.57%

100,000

WOLVERINE ASSET MANAGEMENT LLC QSEAR

$16,305

1.17%

74,112

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	74,112	$16,305	100.0%	Defined

MIZUHO SECURITIES USA LLC QSEAR

—

10,235

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