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Quartzsea Acquisition Corporation QSEA

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Estimated market cap $109.15M10.13M shares, shares as of Oct 9, 2026CIK 2047455

Insider trades, 12 mo

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No open-market trades

Congress trades, 24 mo

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No disclosed trades

13F holders, Q2 2026

73.2% of shares · 9 added

13F holders

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Lobbying, 12 mo

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No lobbying filings

Federal contracts, 12 mo

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None matched

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Latest 10-Q

Q3 2026

What changed in Quartzsea Acquisition Corporation's latest quarterly report, compared with the one before.

Filed Oct 9, 2026 · Quarter ended Aug 31, 2026

Compared with the 10-Q for the quarter ended May 31, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in Quartzsea Acquisition Corporation's latest quarterly report, compared with the one before.

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Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

No recent insider purchases or sales for this company.

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

7.42M shares

21 funds report QSEA. Values checked against market prices.

Funds own 73% of shares (Q2 2026)

21 funds hold the stock.

Q3 2026: 30% · 5,560 of ~8,900 funds reported so far

Q2 202561%
Q3 202565%
Q4 202566%
Q1 202666%
Q2 202673%
Q3 2026 (so far)30%

Reports for the quarter ending Sep 30, 2026 are still coming in (10 positions so far, against 22 the quarter before), so we compare the two complete quarters before it.

Q2 2026. 2 new, 9 added to, 8 trimmed, 7 exited since Q1 2026.

Top 13F holders
#
1	Mizuho Securities USA LLC 13F ↗	1.67M	$17.3M	+146.6%
2	Berkley W R Corp 13F ↗	1.09M	$11.5M	+169.8%
3	Karpus Management, Inc. 13F ↗	974,765	$10.3M	-56.8%
4	Westchester Capital Management, LLC 13F ↗	611,605	$6.4M	+66.8%
5	Rivernorth Capital Management, LLC 13F ↗	499,664	$5.3M	unchanged
6	Wolverine Asset Management LLC 13F ↗	495,488	$5.2M	-17.4%
7	Polar Asset Management Partners Inc. 13F ↗	375,000	$3.9M	+7.1%
8	AQR Arbitrage LLC 13F ↗	356,213	$3.7M	+0.5%
9	RLH Capital LLC 13F ↗	252,439	$2.7M	+510.7%
10	Hudson Bay Capital Management LP 13F ↗	175,159	$1.8M	+0.1%

Download CSV Every fund that holds QSEA, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What Quartzsea Acquisition Corporation and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What Quartzsea Acquisition Corporation and its lobbying firms report each quarter.

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Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report

Funds holding the stock by quarter

Q2 2025	24	—	6.94M	$69.7M
Q3 2025	25	+1	7.47M	$74.3M
Q4 2025	25	0	7.50M	$75.4M
Q1 2026	26	+1	7.53M	$78.0M
Q2 2026	21	-5	7.42M	$77.8M
Q3 2026	10	-11	3.07M	$32.8M

Each point is a quarter-end, from Q2 2025 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (G7314B104). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2025) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes7 in 12 mo 8-K events4 in 90 days PatentsNone on record Short interestFINRA · updated Oct 15 Planned insider salesNone in 12 mo Executive payNone on record Wikipedia attentionNone on record SEC enforcementNone on record IPO history1 registration Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: Quartzsea Acquisition Corp
Address: SUITE 331, 1185 6TH AVE, NEW YORK, NY 10036
Phone: 212-612-1400
Fiscal year ends: Nov 30
Filer category: emerging growth company
Incorporated in: Cayman Islands
Listed as: QSEA (Nasdaq), QSEAR (Nasdaq), QSEAU (Nasdaq)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$10.77$0.00 (0.00%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $10.66 · High $10.77Nov 13, 2026

Aug 13, 2026Low $10.60 · High $10.77Nov 13, 2026

Nov 13, 2025Low $10.14 · High $10.77Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.