26 institutions reported holding $143.3M of KEYSTONE A (KEYY) in SEC 13F filings for 2026-06-30. Largest institutional holders: GLAZER CAPITAL, LLC ($14.2M), Linden Advisors LP ($12.8M), METEORA CAPITAL, LLC ($11.0M), Polar Asset Management Partners Inc. ($10.8M), TORONTO DOMINION BANK ($10.6M). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30