Pioneer Acquisition I (PACH)
Pursues a public-market business combination with emphasis on healthcare targets.
$10.33
At close+0.02 (+0.19%)
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Breakdown13F · 13D/G · Form 4
| Institutions61 holders · as of Mar 31, 2026 | 352.43% | 22.29M shares | |
| Insiders1 holder · as of Jun 17, 2025 | 100.00% | 6.33M shares | |
| Adds to | 452.43% |
6.33M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing
Two share counts disagree (6.33M in the company's Sep 3, 2026 report, 31.63M elsewhere); stakes use the report.
These groups come from separate filings that can overlap, so they add to 452.43%; nothing is left for Other.
Institutions13F, as of Mar 31, 2026
61 holders · 22.29M shares · 6 new positions · 14 increased · 10 reduced · 4 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Westchester Capital Management, LLC | 1.26M | 19.90% | +850.0K | May 15, 2026 |
| D. E. Shaw & Co., Inc. | 1.25M | 19.80% | 0 | May 15, 2026 |
| Glazer Capital, LLC | 1.21M | 19.14% | +160.0K | May 14, 2026 |
| Magnetar Financial LLC | 1.00M | 15.81% | 0 | May 13, 2026 |
| Linden Advisors LP | 1.00M | 15.81% | 0 | May 15, 2026 |
| AQR Arbitrage LLC | 948.4K | 14.99% | −36.2K | May 15, 2026 |
| Wealthspring Capital LLC | 841.5K | 13.30% | −8.8K | May 4, 2026 |
| Two Sigma Investments, LP | 797.5K | 12.61% | 0 | May 15, 2026 |
Ownership statements13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Barclays PLC | 5.93% | 1.50M | 13G | Nov 12, 2025 ↗ |
| D. E. Shaw & Co., L.P. | 5.70% | 1.25M | 13G | May 15, 2026 ↗ |
| Westchester Capital Management, LLC | 5.65% | 1.25M | 13G | May 15, 2026 ↗ |
| Glazer Capital, LLC | 5.47% | 1.21M | 13G | May 14, 2026 ↗ |
| AQR Capital Management, LLC | 5.11% | 1.29M | 13G | Aug 13, 2025 ↗ |
Insider tradesForm 4
Latest trades
Nothing filed in the last 12 months.
CongressHouse and Senate disclosures
Not reported.