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.

RankInstitutionValueSharesChange
1Magnetar Financial LLC$20.1M2.0MNew
2AQR Arbitrage LLC$17.3M1.7MNew
3LMR Partners LLP$13.1M1.3MNew
4HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$12.6M1.2MNew
5Alberta Investment Management Corp$8.0M800,000New
6HGC Investment Management Inc.$8.0M800,000New
7Fort Baker Capital Management LP$6.0M600,000New
8BNP PARIBAS FINANCIAL MARKETS$5.3M526,725New
9MILLENNIUM MANAGEMENT LLC$5.0M500,000New
10Radcliffe Capital Management, L.P.$5.0M499,900New
11Centiva Capital, LP$4.3M425,000New
12PICTON MAHONEY ASSET MANAGEMENT$4.0M400,000New
13Decagon Asset Management LLP$3.8M375,000New
14WHITEBOX ADVISORS LLC$3.5M350,000New
15MOORE CAPITAL MANAGEMENT, LP$3.0M300,000New
16Lineage Point Capital LP$3.0M295,719New
17RIVERNORTH CAPITAL MANAGEMENT, LLC$2.0M200,000New
18Calamos Advisors LLC$2.0M200,000New
19Schonfeld Strategic Advisors LLC$2.0M200,000New
20TORONTO DOMINION BANK$2.0M199,900New
21Ghisallo Capital Management LLC$1.5M150,000New
22ARISTEIA CAPITAL, L.L.C.$1.4M144,062New
23DLD Asset Management, LP$1.0M100,000New
24SUSQUEHANNA INTERNATIONAL GROUP, LLP$401,60040,000New
25ABC ARBITRAGE SA$301,20030,000New

Source: SEC Form 13F filings · as of 2026-06-30