Pioneer Acquisition I Corp - PACH
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Westchester Capital Management, LLC | History | No change | 1,258,612 | 12,787 | 0.58% | 0.54% | 1 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| D. E. Shaw & Co., Inc. | History | No change | 1,252,350 | 12,723 | 0.01% | 0.01% | 2 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| GLAZER CAPITAL, LLC | History | Added to | 1,210,643 | 12,264 | 0.26% | 0.28% | 3 | +159,993 | 15.23% | Q1 2026 | May 14, 2026 |
| Magnetar Financial LLC | History | No change | 1,000,000 | 10,190 | 0.1% | 0.1% | 4 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| LINDEN ADVISORS LP | History | No change | 1,000,000 | 10,160 | 0.06% | 0.06% | 5 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| AQR Arbitrage LLC | History | Reduced | 948,381 | 9,635 | 0.16% | 0.21% | 6 | -36,227 | -3.68% | Q1 2026 | May 15, 2026 |
| Wealthspring Capital LLC | History | Reduced | 841,508 | 8,524 | 2.02% | 2.02% | 7 | -8,828 | -1.04% | Q1 2026 | May 01, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | No change | 797,500 | 8,078 | 0.01% | 0.01% | 8 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| LMR Partners LLP | History | No change | 750,000 | 7,725 | 0.02% | 0.01% | 9 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| HGC Investment Management Inc. | History | No change | 743,077 | 7,653 | 1.7% | 1.61% | 10 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| MMCAP International Inc. SPC | History | No change | 750,000 | 7,597 | 0.66% | 0.75% | 11 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| WOLVERINE ASSET MANAGEMENT LLC | History | Added to | 702,778 | 7,140 | 0.07% | 0.04% | 12 | +190,272 | 37.13% | Q1 2026 | May 04, 2026 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | History | No change | 650,000 | 6,604 | 0.01% | 0.01% | 13 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Radcliffe Capital Management, L.P. | History | No change | 629,247 | 6,383 | 0.48% | 0.34% | 14 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| TENOR CAPITAL MANAGEMENT Co., L.P. | History | No change | 600,000 | 6,078 | 0.09% | 0.08% | 15 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| TORONTO DOMINION BANK | History | Added to | 531,675 | 5,447 | 0.01% | 0.01% | 16 | +23,975 | 4.72% | Q1 2026 | May 15, 2026 |
| Verition Fund Management LLC | History | Reduced | 525,558 | 5,339 | 0.03% | 0.02% | 17 | -18,642 | -3.43% | Q1 2026 | May 15, 2026 |
| Karpus Management, Inc. | History | Added to | 501,988 | 5,085 | 0.16% | 0.15% | 18 | +20,900 | 4.34% | Q1 2026 | May 14, 2026 |
| Alberta Investment Management Corp | History | No change | 500,000 | 5,080 | 0.03% | 0.03% | 19 | 0 | 0.0% | Q1 2026 | Apr 28, 2026 |
| Jain Global LLC | History | Reduced | 499,979 | 5,079 | 0.02% | 0.02% | 20 | -21 | -0.0% | Q1 2026 | May 15, 2026 |
| PICTON MAHONEY ASSET MANAGEMENT | History | No change | 500,000 | 5,065 | 0.04% | 0.04% | 21 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| First Trust Capital Management L.P. | History | No change | 500,000 | 5,065 | 0.27% | 0.3% | 22 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Shaolin Capital Management LLC | History | No change | 500,000 | 5,065 | 0.19% | 0.16% | 23 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| MANGROVE PARTNERS IM, LLC | History | No change | 450,000 | 4,558 | 0.37% | 0.37% | 24 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| OMERS ADMINISTRATION Corp | History | No change | 440,000 | 4,470 | 0.03% | 0.03% | 25 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | History | No change | 400,000 | 4,058 | 0.02% | 0.02% | 26 | 0 | 0.0% | Q1 2026 | May 01, 2026 |
| Polar Asset Management Partners Inc. | History | Reduced | 400,000 | 4,052 | 0.08% | 0.06% | 28 | -100,000 | -20.0% | Q1 2026 | May 15, 2026 |
| ARISTEIA CAPITAL, L.L.C. | History | No change | 400,000 | 4,052 | 0.08% | 0.09% | 27 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Mint Tower Capital Management B.V. | History | No change | 400,000 | 4,052 | 0.36% | 0.46% | 29 | 0 | 0.0% | Q1 2026 | May 04, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Added to | 348,493 | 3,530 | 0.0% | 0.0% | 30 | +40,079 | 13.0% | Q1 2026 | May 12, 2026 |
| PERISCOPE CAPITAL INC. | History | Reduced | 300,000 | 3,043 | 0.34% | 0.46% | 31 | -100,000 | -25.0% | Q1 2026 | May 13, 2026 |
| WHITEBOX ADVISORS LLC | History | No change | 300,000 | 3,039 | 0.04% | 0.04% | 32 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Added to | 287,699 | 2,914 | 0.0% | 0.0% | 33 | +18,199 | 6.75% | Q1 2026 | May 15, 2026 |
| O'Connor Alternative Investments LLC | History | New | 250,000 | 2,540 | 0.22% | — | 35 | +250,000 | New | Q1 2026 | May 15, 2026 |
| Ghisallo Capital Management LLC | History | No change | 250,000 | 2,540 | 0.07% | 0.11% | 34 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| MOORE CAPITAL MANAGEMENT, LP | History | No change | 250,000 | 2,532 | 0.05% | 0.04% | 36 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | History | No change | 249,758 | 2,530 | 0.13% | 0.12% | 37 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) | History | No change | 250,000 | 2,515 | 0.29% | 0.29% | 38 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Hudson Bay Capital Management LP | History | No change | 246,000 | 2,499 | 0.01% | 0.01% | 39 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| CSS LLC/IL | History | Reduced | 210,988 | 2,137 | 0.1% | 0.09% | 40 | -1,400 | -0.66% | Q1 2026 | May 15, 2026 |
| Clear Street Group Inc. | History | Reduced | 165,911 | 1,683 | 0.01% | 0.01% | 41 | -166,694 | -50.12% | Q1 2026 | May 15, 2026 |
| Lineage Point Capital LP | History | No change | 157,672 | 1,604 | 0.39% | 0.6% | 42 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Context Capital Management, LLC | History | No change | 150,000 | 1,521 | 0.04% | 0.04% | 43 | 0 | 0.0% | Q1 2026 | May 07, 2026 |
| TIG Advisors, LLC | History | No change | 150,000 | 1,521 | 0.07% | 0.07% | 44 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| BERKLEY W R CORP | History | No change | 148,726 | 1,508 | 0.08% | 0.07% | 45 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| DLD Asset Management, LP | History | No change | 127,737 | 1,293 | 0.12% | 0.09% | 46 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| SONA ASSET MANAGEMENT (US) LLC | History | New | 111,059 | 1,125 | 0.02% | — | 47 | +111,059 | New | Q1 2026 | May 15, 2026 |
| SYQUANT CAPITAL SAS | History | No change | 110,000 | 1,123 | 0.18% | 0.14% | 48 | 0 | 0.0% | Q1 2026 | Apr 10, 2026 |
| Dakota Wealth Management | History | Reduced | 104,100 | 1,054 | 0.02% | 0.02% | 49 | -4,900 | -4.5% | Q1 2026 | May 07, 2026 |
| JPMORGAN CHASE & CO | History | No change | 100,000 | 1,021 | 0.0% | 0.0% | 50 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| HEIGHTS CAPITAL MANAGEMENT, INC | History | No change | 100,000 | 1,016 | 0.28% | 0.36% | 51 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Governors Lane LP | History | No change | 100,000 | 1,014 | 0.06% | 0.06% | 52 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Parallax Volatility Advisers, L.P. | History | New | 94,401 | 960 | 0.0% | — | 53 | +94,401 | New | Q1 2026 | May 15, 2026 |
| BOOTHBAY FUND MANAGEMENT, LLC | History | No change | 83,391 | 844 | 0.01% | 0.01% | 54 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| GRITSTONE ASSET MANAGEMENT LLC | History | No change | 69,324 | 702 | 0.75% | 0.66% | 55 | 0 | 0.0% | Q1 2026 | May 05, 2026 |
| Timelo Investment Management Inc. | History | No change | 60,000 | 607 | 0.48% | 0.22% | 56 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Centiva Capital, LP | History | No change | 50,000 | 508 | 0.0% | 0.0% | 57 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Kepos Capital LP | History | New | 47,100 | 478 | 0.78% | — | 58 | +47,100 | New | Q1 2026 | May 12, 2026 |
| Stoic Point Capital Management LLC | History | No change | 33,775 | 342 | 0.33% | 0.29% | 59 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| READYSTATE ASSET MANAGEMENT LP | History | No change | 31,492 | 321 | 0.01% | 0.01% | 60 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| HRT FINANCIAL LP | History | No change | 25,000 | 255 | 0.0% | 0.0% | 61 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| ABC ARBITRAGE SA | History | No change | 25,000 | 253 | 0.03% | 0.02% | 62 | 0 | 0.0% | Q1 2026 | May 04, 2026 |
| Yakira Capital Management, Inc. | History | Reduced | 24,485 | 252 | 0.07% | 0.09% | 63 | -515 | -2.06% | Q1 2026 | May 14, 2026 |
| L1 Global Manager Pty Ltd | History | No change | 24,400 | 247 | 0.17% | 0.16% | 64 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Rangeley Capital, LLC | History | No change | 22,145 | 228 | 0.22% | 0.19% | 65 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| PenderFund Capital Management Ltd. | History | Reduced | 15,200 | 154 | 0.02% | 0.03% | 66 | -2,200 | -12.64% | Q1 2026 | May 15, 2026 |
| DELTEC ASSET MANAGEMENT LLC | History | No change | 10,000 | 101 | 0.02% | 0.02% | 67 | 0 | 0.0% | Q1 2026 | Apr 24, 2026 |
| UBS Group AG | History | Added to | 9,060 | 91 | 0.0% | — | 68 | +9,050 | 90500.0% | Q1 2026 | May 05, 2026 |
| FNY Investment Advisers, LLC | History | No change | 1,000 | 10 | 0.0% | 0.0% | 69 | 0 | 0.0% | Q1 2026 | Apr 15, 2026 |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | History | No change | 500 | 5 | 0.0% | 0.0% | 70 | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| METEORA CAPITAL, LLC | History | Closed out | 0 | 0 | — | 0.46% | — | -549,969 | -100.0% | Q1 2026 | May 15, 2026 |
| MIZUHO SECURITIES USA LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -50,924 | -100.0% | Q1 2026 | May 11, 2026 |
| Virtu Financial LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -34,201 | -100.0% | Q1 2026 | May 14, 2026 |
| MORGAN STANLEY | History | Added to | 68 | 0 | — | — | — | +1 | 1.49% | Q1 2026 | May 15, 2026 |