Keystone Acquisition Corp. (KEYY) — Institutional Holders, Q2 2026
54 institutional investment managers reported a KEYY position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $284.0M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
KEYY 13F holders ranked 1–54 of 54
| # | Institution | Shares | Value | % of portfolio | QoQShares vs prior Q |
|---|---|---|---|---|---|
| 1 | Magnetar Financial#1 · 2,000,000 sh | 2,000,000 | $20.1M | 0.18% | — |
| 2 | AQR Arbitrage#2 · 1,723,275 sh | 1,723,275 | $17.3M | 0.25% | — |
| 3 | GLAZER CAPITAL#3 · 2,105,266 sh | 2,105,266 | $14.5M | 0.36% | — |
| 4 | LINDEN ADVISORS#4 · 1,996,893 sh | 1,996,893 | $13.1M | 0.07% | — |
| 5 | LMR Partners LLP#5 · 1,300,000 sh | 1,300,000 | $13.1M | 0.05% | — |
| 6 | TORONTO DOMINION BANK#6 · 1,297,642 sh | 1,297,642 | $12.7M | 0.01% | — |
| 7 | HEALTHCARE OF ONTARIO PENSION PLAN FUND#7 · 1,250,000 sh | 1,250,000 | $12.6M | 0.02% | — |
| 8 | METEORA CAPITAL#8 · 1,672,972 sh | 1,672,972 | $11.3M | 0.93% | — |
| 9 | Polar Asset Management Partners#9 · 1,650,000 sh | 1,650,000 | $11.1M | 0.18% | — |
| 10 | SONA ASSET MANAGEMENT (US)#10 · 1,350,000 sh | 1,350,000 | $9.1M | 0.19% | — |
| 11 | Centiva Capital#11 · 1,062,500 sh | 1,062,500 | $8.6M | 0.07% | — |
| 12 | Alberta Investment Management#12 · 800,000 sh | 800,000 | $8.0M | 0.05% | — |
| 13 | HGC Investment Management#13 · 800,000 sh | 800,000 | $8.0M | 1.59% | — |
| 14 | BOOTHBAY FUND MANAGEMENT#14 · 769,864 sh | 769,864 | $7.6M | 0.10% | — |
| 15 | TENOR CAPITAL MANAGEMENT , L.P.#15 · 1,125,000 sh | 1,125,000 | $7.6M | 0.11% | — |
| 16 | First Capital Management L.P.#16 · 749,998 sh | 749,998 | $7.4M | 0.43% | — |
| 17 | Verition Fund Management#17 · 987,988 sh | 987,988 | $6.7M | <0.01% | — |
| 18 | Hudson Bay Capital Management#18 · 900,000 sh | 900,000 | $6.0M | 0.02% | — |
| 19 | Fort Baker Capital Management#19 · 600,000 sh | 600,000 | $6.0M | 0.44% | — |
| 20 | BNP PARIBAS FINANCIAL MARKETS#20 · 526,725 sh | 526,725 | $5.3M | <0.01% | — |
| 21 | PERISCOPE CAPITAL#21 · 749,700 sh | 749,700 | $5.0M | 0.44% | — |
| 22 | MILLENNIUM MANAGEMENT#22 · 500,000 sh | 500,000 | $5.0M | <0.01% | — |
| 23 | Radcliffe Capital Management, L.P.#23 · 499,900 sh | 499,900 | $5.0M | 0.38% | — |
| 24 | CSS#24 · 690,383 sh | 690,383 | $4.6M | 0.18% | — |
| 25 | Shaolin Capital Management#25 · 687,984 sh | 687,984 | $4.5M | 0.22% | — |
| 26 | TWO SIGMA INVESTMENTS#26 · 453,124 sh | 453,124 | $4.5M | <0.01% | — |
| 27 | PICTON MAHONEY ASSET MANAGEMENT#27 · 400,000 sh | 400,000 | $4.0M | 0.03% | — |
| 28 | Decagon Asset Management LLP#28 · 375,000 sh | 375,000 | $3.8M | 0.72% | — |
| 29 | WHITEBOX ADVISORS#29 · 350,000 sh | 350,000 | $3.5M | 0.05% | — |
| 30 | Clear Street Group#30 · 596,031 sh | 596,031 | $3.3M | <0.01% | — |
| 31 | Saba Capital Management, L.P.#31 · 449,994 sh | 449,994 | $3.0M | 0.08% | — |
| 32 | MOORE CAPITAL MANAGEMENT#32 · 300,000 sh | 300,000 | $3.0M | 0.04% | — |
| 33 | Lineage Point Capital#33 · 295,719 sh | 295,719 | $3.0M | 0.61% | — |
| 34 | K2 PRINCIPAL FUND, L.P.#34 · 443,023 sh | 443,023 | $3.0M | 0.22% | — |
| 35 | O'Connor Alternative Investments#35 · 250,000 sh | 250,000 | $2.5M | 0.18% | — |
| 36 | RIVERNORTH CAPITAL MANAGEMENT#36 · 200,000 sh | 200,000 | $2.0M | 0.10% | — |
| 37 | WOLVERINE ASSET MANAGEMENT#37 · 296,297 sh | 296,297 | $2.0M | 0.02% | — |
| 38 | Calamos Advisors#38 · 200,000 sh | 200,000 | $2.0M | <0.01% | — |
| 39 | Mint Tower Capital Management B.V.#39 · 300,000 sh | 300,000 | $2.0M | 0.23% | — |
| 40 | Schonfeld Strategic Advisors#40 · 200,000 sh | 200,000 | $2.0M | <0.01% | — |
| 41 | StoneX Group#41 · 193,290 sh | 193,290 | $1.9M | 0.08% | — |
| 42 | Governors Lane#42 · 272,074 sh | 272,074 | $1.8M | 0.15% | — |
| 43 | Ghisallo Capital Management#43 · 150,000 sh | 150,000 | $1.5M | 0.03% | — |
| 44 | ARISTEIA CAPITAL, L.L.C.#44 · 144,062 sh | 144,062 | $1.4M | 0.02% | — |
| 45 | DLD Asset Management#45 · 100,000 sh | 100,000 | $1.0M | 0.07% | — |
| 46 | BERKLEY W R#46 · 99,400 sh | 99,400 | $980.1K | 0.05% | — |
| 47 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#47 · 40,000 sh | 40,000 | $401.6K | 0.00% | — |
| 48 | Harraden Circle Investments#48 · 908,070 sh | 908,070 | $399.5K | 0.05% | — |
| 49 | ABC ARBITRAGE SA#49 · 30,000 sh | 30,000 | $301.2K | — | — |
| 50 | Virtu Financial#50 · 24,639 sh | 24,639 | $243.0K | <0.01% | — |
| 51 | HRT FINANCIAL#51 · 22,330 sh | 22,330 | $224.0K | <0.01% | — |
| 52 | LONGFELLOW INVESTMENT MANAGEMENT#52 · 8,642 sh | 8,642 | $86.8K | 0.02% | — |
| 53 | UBS Group AG#53 · 1,040 sh | 1,040 | $10.4K | 0.00% | — |
| 54 | HIGHBRIDGE CAPITAL MANAGEMENT#54 · 500 sh | 500 | $215.00 | 0.00% | — |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for the prior quarter without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.