KEYSTONE ACQUISITION CORP (KEYYW)

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

Reporting holders

$135.2M

Reported value

0.0%

Calls

0.0%

Puts

+29

Holder change

Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.

Holders

Download these holders as CSV

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
HRT FINANCIAL LP	$224.0K	22,330	0.00%	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

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	29	$135.2M	13,462,146	29	0	0	0.0%