Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in JACS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Hudson Bay Capital Management LP | 1.5M | $16.1M | +2.2% | 6.611% | 0.17% |
| 2 | METEORA CAPITAL, LLC | 1.2M | $12.9M | +58.3% | 5.303% | 0.95% |
| 3 | Westchester Capital Management, LLC | 1.2M | $12.6M | 0.0% | 5.157% | 0.60% |
| 4 | CNH PARTNERS LLC | 1.2M | $12.3M | -4.5% | 5.055% | 0.20% |
| 5 | LINDEN ADVISORS LP | 1.1M | $12.2M | 0.0% | 5.000% | 0.07% |
| 6 | D. E. Shaw & Co., Inc. | 1.1M | $12.1M | 0.0% | 4.950% | 0.01% |
| 7 | WOLVERINE ASSET MANAGEMENT LLC | 1.1M | $11.1M | +6.8% | 4.566% | 0.19% |
| 8 | Polar Asset Management Partners Inc. | 1.0M | $10.8M | 0.0% | 4.457% | 0.24% |
| 9 | MIZUHO SECURITIES USA LLC | 715K | $7.5M | +749.9% | 3.108% | 0.18% |
| 10 | HEIGHTS CAPITAL MANAGEMENT, INC | 700K | $7.4M | 0.0% | 3.043% | 2.08% |
| 11 | Radcliffe Capital Management, L.P. | 675K | $7.1M | +1.9% | 2.935% | 0.54% |
| 12 | TENOR CAPITAL MANAGEMENT Co., L.P. | 600K | $6.4M | 0.0% | 2.609% | 0.10% |
| 13 | Magnetar Financial LLC | 600K | $6.3M | 0.0% | 2.609% | 0.06% |
| 14 | Vivaldi Asset Management, LLC | 563K | $6.0M | -0.9% | 2.446% | 0.31% |
| 15 | TWO SIGMA INVESTMENTS, LP | 475K | $5.0M | 0.0% | 2.064% | 0.00% |
| 16 | LMR Partners LLP | 444K | $4.7M | 0.0% | 1.929% | 0.04% |
| 17 | BERKLEY W R CORP | 430K | $4.6M | +24.3% | 1.871% | 0.24% |
| 18 | Bulldog Investors, LLP | 409K | $4.3M | -0.3% | 1.777% | 0.97% |
| 19 | Wealthspring Capital LLC | 400K | $4.2M | 0.0% | 1.741% | 1.01% |
| 20 | TORONTO DOMINION BANK | 400K | $4.2M | -33.6% | 1.739% | 0.01% |
| 21 | PICTON MAHONEY ASSET MANAGEMENT | 400K | $4.2M | 0.0% | 1.739% | 0.04% |
| 22 | Verition Fund Management LLC | 375K | $4.0M | +168.0% | 1.629% | 0.03% |
| 23 | GOLDMAN SACHS GROUP INC | 360K | $3.8M | 0.0% | 1.566% | 0.00% |
| 24 | RIVERNORTH CAPITAL MANAGEMENT, LLC | 360K | $3.8M | -10.0% | 1.563% | 0.19% |
| 25 | Crossingbridge Advisors, LLC | 327K | $3.5M | +1925770.6% | 1.423% | 0.63% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in JACS — a direct measure of their conviction.
Filings activity in JACS during Q1 2026, grouped by how each filer changed its position.
5 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 47 | +12% | 88.13% | +1.83 pp | $215M | +2.1% |
| Q4 2025 | 42 | +2.4% | 86.30% | +2.62 pp | $211M | +3.1% |
| Q3 2025 | 41 | 4.7% | 83.68% | +2.48 pp | $204M | +3.1% |
| Q2 2025 | 43 | +23% | 81.20% | +22.86 pp | $198M | +39% |
| Q1 2025 | 35 | — | 58.34% | — | $142M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying JACS stock.
Based on Q1 2026 13F filings, institutional ownership of Jackson Acquisition Company II stands at 88.1%, held across 47 reporting institutions.
Hudson Bay Capital Management LP is the largest reported institutional holder of JACS, with approximately 1,520,505 shares worth $0.02B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of JACS, including TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for JACS is 70 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
6 institutions opened new positions in JACS during Q1 2026, while 1 fully exited. 33 added to existing positions and 8 trimmed.
JACS institutional ownership rose by 1.83 percentage points quarter-over-quarter, with a net change of +5 holders.
The top 10 institutions account for 53.4% of all reported 13F value in JACS, and the top 25 account for 86.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Jackson Acquisition Company II (JACS) Institutional Ownership