KEYSTONE ACQUISITION CORP (KEYYW)

Institutional ownership reported to the SEC as of Q2 2026, across 1 quarters.

Reporting holders

$135.0M

Reported value

0.0%

Held as options

+28

Holder change

Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.

Holders

Filer	Value	Shares	Their book	Held	Change
Magnetar Financial LLC	$20.1M	2,000,000	0.18%	new	NEW
AQR Arbitrage LLC	$17.3M	1,723,275	0.25%	new	NEW
LMR Partners LLP	$13.1M	1,300,000	0.05%	new	NEW
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	$12.6M	1,250,000	0.02%	new	NEW
Alberta Investment Management Corp	$8.0M	800,000	0.05%	new	NEW
HGC Investment Management Inc.	$8.0M	800,000	1.59%	new	NEW
Fort Baker Capital Management LP	$6.0M	600,000	0.44%	new	NEW
BNP PARIBAS FINANCIAL MARKETS	$5.3M	526,725	0.00%	new	NEW
MILLENNIUM MANAGEMENT LLC	$5.0M	500,000	0.00%	new	NEW
Radcliffe Capital Management, L.P.	$5.0M	499,900	0.38%	new	NEW
Centiva Capital, LP	$4.3M	425,000	0.04%	new	NEW
PICTON MAHONEY ASSET MANAGEMENT	$4.0M	400,000	0.03%	new	NEW
Decagon Asset Management LLP	$3.8M	375,000	0.72%	new	NEW
WHITEBOX ADVISORS LLC	$3.5M	350,000	0.05%	new	NEW
MOORE CAPITAL MANAGEMENT, LP	$3.0M	300,000	0.04%	new	NEW
Lineage Point Capital LP	$3.0M	295,719	0.61%	new	NEW
RIVERNORTH CAPITAL MANAGEMENT, LLC	$2.0M	200,000	0.10%	new	NEW
Calamos Advisors LLC	$2.0M	200,000	0.01%	new	NEW
Schonfeld Strategic Advisors LLC	$2.0M	200,000	0.01%	new	NEW
TORONTO DOMINION BANK	$2.0M	199,900	0.00%	new	NEW
Ghisallo Capital Management LLC	$1.5M	150,000	0.03%	new	NEW
ARISTEIA CAPITAL, L.L.C.	$1.4M	144,062	0.02%	new	NEW
DLD Asset Management, LP	$1.0M	100,000	0.07%	new	NEW
SUSQUEHANNA INTERNATIONAL GROUP, LLP	$401.6K	40,000	0.00%	new	NEW
ABC ARBITRAGE SA	$301.2K	30,000	0.03%	new	NEW
Clear Street Group Inc.	$206.4K	20,553	0.00%	new	NEW
LONGFELLOW INVESTMENT MANAGEMENT CO LLC	$86.8K	8,642	0.02%	new	NEW
UBS Group AG	$10.4K	1,040	0.00%	new	NEW
HRT FINANCIAL LP	$224	22,330	0.00%	new	NEW

Five percent filings

Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →

Filed	Form	Filer	% of class
2026-08-13	13G	MAGNETAR FINANCIAL LLC SPACwith 3 co-filers	7.0%

Quarter by quarter

Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.

Quarter	Holders	Value	Shares	New	Added	Trimmed	Options
Q2 2026	28	$135.0M	13,439,816	28	0	0	0.0%