Who Owns KEYSTONE ACQUISITION CORP (KEYYU)? -- Institutional Holders (2026-06-30)

29 institutions reported holding $135.2M of KEYSTONE ACQUISITION CORP (KEYYU) in SEC 13F filings for 2026-06-30. Largest institutional holders: Magnetar Financial LLC ($20.1M), AQR Arbitrage LLC ($17.3M), LMR Partners LLP ($13.1M), HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND ($12.6M), Alberta Investment Management Corp ($8.0M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	Magnetar Financial LLC	$20.1M	2.0M	New
2	AQR Arbitrage LLC	$17.3M	1.7M	New
3	LMR Partners LLP	$13.1M	1.3M	New
4	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	$12.6M	1.2M	New
5	Alberta Investment Management Corp	$8.0M	800,000	New
6	HGC Investment Management Inc.	$8.0M	800,000	New
7	Fort Baker Capital Management LP	$6.0M	600,000	New
8	BNP PARIBAS FINANCIAL MARKETS	$5.3M	526,725	New
9	MILLENNIUM MANAGEMENT LLC	$5.0M	500,000	New
10	Radcliffe Capital Management, L.P.	$5.0M	499,900	New
11	Centiva Capital, LP	$4.3M	425,000	New
12	PICTON MAHONEY ASSET MANAGEMENT	$4.0M	400,000	New
13	Decagon Asset Management LLP	$3.8M	375,000	New
14	WHITEBOX ADVISORS LLC	$3.5M	350,000	New
15	MOORE CAPITAL MANAGEMENT, LP	$3.0M	300,000	New
16	Lineage Point Capital LP	$3.0M	295,719	New
17	RIVERNORTH CAPITAL MANAGEMENT, LLC	$2.0M	200,000	New
18	Calamos Advisors LLC	$2.0M	200,000	New
19	Schonfeld Strategic Advisors LLC	$2.0M	200,000	New
20	TORONTO DOMINION BANK	$2.0M	199,900	New
21	Ghisallo Capital Management LLC	$1.5M	150,000	New
22	ARISTEIA CAPITAL, L.L.C.	$1.4M	144,062	New
23	DLD Asset Management, LP	$1.0M	100,000	New
24	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$401,600	40,000	New
25	ABC ARBITRAGE SA	$301,200	30,000	New

来源：SEC 13F 申报文件 · 截至 2026-06-30