# KEYSTONE ACQUISITION CORP (KEYYW)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/KEYYW/

- Reporting holders: 29
- Reported value: $135.2M
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Magnetar Financial LLC](https://holderbook.com/funds/1352851-magnetar-financial-llc/) | $20.1M | 2,000,000 | 0.2% | 1 |
| [AQR Arbitrage LLC](https://holderbook.com/funds/1167456-aqr-arbitrage-llc/) | $17.3M | 1,723,275 | 0.2% | 1 |
| [LMR Partners LLP](https://holderbook.com/funds/1578621-lmr-partners-llp/) | $13.1M | 1,300,000 | 0.0% | 1 |
| [HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND](https://holderbook.com/funds/1535845-healthcare-of-ontario-pension-plan-trust-fund/) | $12.6M | 1,250,000 | 0.0% | 1 |
| [Alberta Investment Management Corp](https://holderbook.com/funds/1463559-alberta-investment-management-corp/) | $8.0M | 800,000 | 0.0% | 1 |
| [HGC Investment Management Inc.](https://holderbook.com/funds/1711200-hgc-investment-management-inc/) | $8.0M | 800,000 | 1.6% | 1 |
| [Fort Baker Capital Management LP](https://holderbook.com/funds/1688382-fort-baker-capital-management-lp/) | $6.0M | 600,000 | 0.4% | 1 |
| [BNP PARIBAS FINANCIAL MARKETS](https://holderbook.com/funds/1166588-bnp-paribas-financial-markets/) | $5.3M | 526,725 | 0.0% | 1 |
| [MILLENNIUM MANAGEMENT LLC](https://holderbook.com/funds/1273087-millennium-management-llc/) | $5.0M | 500,000 | 0.0% | 1 |
| [Radcliffe Capital Management, L.P.](https://holderbook.com/funds/1218275-radcliffe-capital-management-l-p/) | $5.0M | 499,900 | 0.4% | 1 |
| [Centiva Capital, LP](https://holderbook.com/funds/1692507-centiva-capital-lp/) | $4.3M | 425,000 | 0.0% | 1 |
| [PICTON MAHONEY ASSET MANAGEMENT](https://holderbook.com/funds/1539041-picton-mahoney-asset-management/) | $4.0M | 400,000 | 0.0% | 1 |
| [Decagon Asset Management LLP](https://holderbook.com/funds/1950677-decagon-asset-management-llp/) | $3.8M | 375,000 | 0.7% | 1 |
| [WHITEBOX ADVISORS LLC](https://holderbook.com/funds/1257391-whitebox-advisors-llc/) | $3.5M | 350,000 | 0.0% | 1 |
| [MOORE CAPITAL MANAGEMENT, LP](https://holderbook.com/funds/1448574-moore-capital-management-lp/) | $3.0M | 300,000 | 0.0% | 1 |
| [Lineage Point Capital LP](https://holderbook.com/funds/2093311-lineage-point-capital-lp/) | $3.0M | 295,719 | 0.6% | 1 |
| [RIVERNORTH CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1447578-rivernorth-capital-management-llc/) | $2.0M | 200,000 | 0.1% | 1 |
| [Calamos Advisors LLC](https://holderbook.com/funds/1316507-calamos-advisors-llc/) | $2.0M | 200,000 | 0.0% | 1 |
| [Schonfeld Strategic Advisors LLC](https://holderbook.com/funds/1665241-schonfeld-strategic-advisors-llc/) | $2.0M | 200,000 | 0.0% | 1 |
| [TORONTO DOMINION BANK](https://holderbook.com/funds/947263-toronto-dominion-bank/) | $2.0M | 199,900 | 0.0% | 1 |
| [Ghisallo Capital Management LLC](https://holderbook.com/funds/1825214-ghisallo-capital-management-llc/) | $1.5M | 150,000 | 0.0% | 1 |
| [ARISTEIA CAPITAL, L.L.C.](https://holderbook.com/funds/1080171-aristeia-capital-l-l-c/) | $1.4M | 144,062 | 0.0% | 1 |
| [DLD Asset Management, LP](https://holderbook.com/funds/1578299-dld-asset-management-lp/) | $1.0M | 100,000 | 0.1% | 1 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $401.6K | 40,000 | 0.0% | 1 |
| [ABC ARBITRAGE SA](https://holderbook.com/funds/2049221-abc-arbitrage-sa/) | $301.2K | 30,000 | 0.0% | 1 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 29 | $135.2M |