KEYSTONE ACQUISITION CORP UNIT 05/28/2031 is a security (CUSIP G52539114) tracked across SEC portfolio filings. 4 institutional managers reported $10.5M on Form 13F as of 2026-06-30.
| Manager | Location | Value | Shares |
|---|---|---|---|
| Alberta Investment Management Corp | EDMONTON, A0 | $8.0M | 800,000 |
| Calamos Advisors LLC | NAPERVILLE, IL | $2.0M | 200,000 |
| ABC ARBITRAGE SA | PARIS, I0 | $301K | 30,000 |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | BOSTON, MA | $87K | 8,642 |