Pioneer Acquisition I Corp - PACH

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
13D/13G major owners: Ownership tab.
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 Added to 1,258,612 12,738 0.54% 0.42% 1 +344,000 37.61% Q4 2025 Feb 13, 2026
D. E. Shaw & Co., Inc. History Added to 1,252,350 12,598 0.01% 0.0% 2 +560,668 81.06% Q4 2025 Feb 17, 2026
GLAZER CAPITAL, LLC History No change 1,050,650 10,559 0.28% 0.35% 3 0 0.0% Q4 2025 Feb 13, 2026
LINDEN ADVISORS LP History No change 1,000,000 10,060 0.06% 0.07% 4 0 0.0% Q4 2025 Feb 17, 2026
Magnetar Financial LLC History No change 1,000,000 10,060 0.1% 0.06% 5 0 0.0% Q4 2025 Feb 17, 2026
AQR Arbitrage LLC History No change 984,608 9,905 0.21% 0.25% 6 0 0.0% Q4 2025 Feb 17, 2026
Wealthspring Capital LLC History Reduced 850,336 8,545 2.02% 2.09% 7 -32,950 -3.73% Q4 2025 Feb 05, 2026
TWO SIGMA INVESTMENTS, LP History No change 797,500 8,014 0.01% 0.01% 8 0 0.0% Q4 2025 Feb 17, 2026
LMR Partners LLP History No change 750,000 7,665 0.01% 0.03% 9 0 0.0% Q4 2025 Feb 17, 2026
HGC Investment Management Inc. History No change 743,077 7,594 1.61% 1.82% 10 0 0.0% Q4 2025 Feb 17, 2026
MMCAP International Inc. SPC History No change 750,000 7,537 0.75% 0.88% 11 0 0.0% Q4 2025 Feb 09, 2026
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND History No change 650,000 6,539 0.01% 0.01% 12 0 0.0% Q4 2025 Feb 13, 2026
Radcliffe Capital Management, L.P. History Added to 629,247 6,323 0.34% 0.37% 13 +36,772 6.21% Q4 2025 Feb 17, 2026
TENOR CAPITAL MANAGEMENT Co., L.P. History No change 600,000 6,030 0.08% 0.08% 14 0 0.0% Q4 2025 Feb 17, 2026
METEORA CAPITAL, LLC History New 549,969 5,527 0.46% 15 +549,969 New Q4 2025 Feb 17, 2026
Verition Fund Management LLC History Reduced 544,200 5,474 0.02% 0.02% 16 -5,800 -1.05% Q4 2025 Feb 13, 2026
TORONTO DOMINION BANK History Reduced 507,700 5,164 0.01% 0.01% 17 -223,629 -30.58% Q4 2025 Feb 17, 2026
WOLVERINE ASSET MANAGEMENT LLC History Reduced 512,506 5,150 0.04% 0.05% 18 -164,703 -24.32% Q4 2025 Feb 02, 2026
Alberta Investment Management Corp History No change 500,000 5,030 0.03% 0.04% 19 0 0.0% Q4 2025 Feb 19, 2026
Jain Global LLC History No change 500,000 5,030 0.02% 0.02% 20 0 0.0% Q4 2025 Feb 17, 2026
Polar Asset Management Partners Inc. History New 500,000 5,025 0.06% 21 +500,000 New Q4 2025 Feb 17, 2026
Shaolin Capital Management LLC History Reduced 500,000 5,025 0.16% 0.3% 24 -200,000 -28.57% Q4 2025 Feb 17, 2026
PICTON MAHONEY ASSET MANAGEMENT History No change 500,000 5,025 0.04% 0.04% 22 0 0.0% Q4 2025 Feb 11, 2026
First Trust Capital Management L.P. History No change 500,000 5,025 0.3% 0.32% 23 0 0.0% Q4 2025 Feb 13, 2026
Karpus Management, Inc. History Added to 481,088 4,834 0.15% 0.05% 25 +321,088 200.68% Q4 2025 Feb 17, 2026
MANGROVE PARTNERS IM, LLC History No change 450,000 4,522 0.37% 0.33% 26 0 0.0% Q4 2025 Feb 17, 2026
OMERS ADMINISTRATION Corp History No change 440,000 4,426 0.03% 0.03% 27 0 0.0% Q4 2025 Feb 13, 2026
PERISCOPE CAPITAL INC. History Reduced 400,000 4,020 0.46% 0.75% 31 -75,000 -15.79% Q4 2025 Feb 10, 2026
ARISTEIA CAPITAL, L.L.C. History No change 400,000 4,020 0.09% 0.09% 28 0 0.0% Q4 2025 Feb 17, 2026
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS History No change 400,000 4,020 0.02% 0.02% 29 0 0.0% Q4 2025 Feb 10, 2026
Mint Tower Capital Management B.V. History No change 400,000 4,020 0.46% 0.48% 30 0 0.0% Q4 2025 Feb 12, 2026
Clear Street Group Inc. History Reduced 332,605 3,345 0.01% 0.02% 32 -390,688 -54.02% Q4 2025 Feb 13, 2026
BNP PARIBAS FINANCIAL MARKETS History No change 308,414 3,102 0.0% 0.0% 33 0 0.0% Q4 2025 Feb 10, 2026
WHITEBOX ADVISORS LLC History No change 300,000 3,015 0.04% 0.05% 34 0 0.0% Q4 2025 Feb 17, 2026
MILLENNIUM MANAGEMENT LLC History Reduced 269,500 2,708 0.0% 0.0% 35 -15,501 -5.44% Q4 2025 Feb 17, 2026
OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) History No change 250,000 2,515 3.48% 0.4% 36 0 0.0% Q4 2025 Mar 04, 2026
Ghisallo Capital Management LLC History No change 250,000 2,515 0.11% 0.08% 37 0 0.0% Q4 2025 Feb 17, 2026
MOORE CAPITAL MANAGEMENT, LP History No change 250,000 2,512 0.04% 0.03% 38 0 0.0% Q4 2025 Feb 17, 2026
RIVERNORTH CAPITAL MANAGEMENT, LLC History Reduced 249,758 2,510 0.12% 0.14% 39 -4 -0.0% Q4 2025 Feb 17, 2026
Hudson Bay Capital Management LP History No change 246,000 2,474 0.01% 0.01% 40 0 0.0% Q4 2025 Feb 13, 2026
CSS LLC/IL History No change 212,388 2,134 0.09% 0.09% 41 0 0.0% Q4 2025 Feb 17, 2026
Lineage Point Capital LP History New 157,672 1,594 0.6% 42 +157,672 New Q4 2025 Feb 26, 2026
Context Capital Management, LLC History No change 150,000 1,507 0.04% 0.05% 43 0 0.0% Q4 2025 Feb 13, 2026
TIG Advisors, LLC History No change 150,000 1,507 0.07% 0.09% 44 0 0.0% Q4 2025 Feb 17, 2026
BERKLEY W R CORP History No change 148,726 1,494 0.07% 0.09% 45 0 0.0% Q4 2025 Feb 13, 2026
DLD Asset Management, LP History Added to 127,737 1,283 0.09% 0.07% 46 +27,738 27.74% Q4 2025 Feb 13, 2026
SYQUANT CAPITAL SAS History No change 110,000 1,124 0.14% 0.32% 47 0 0.0% Q4 2025 Jan 13, 2026
Dakota Wealth Management History No change 109,000 1,095 0.02% 0.02% 48 0 0.0% Q4 2025 Jan 13, 2026
JPMORGAN CHASE & CO History No change 100,000 1,022 0.0% 0.0% 49 0 0.0% Q4 2025 Feb 11, 2026
HEIGHTS CAPITAL MANAGEMENT, INC History No change 100,000 1,006 0.36% 0.29% 50 0 0.0% Q4 2025 Feb 17, 2026
Governors Lane LP History No change 100,000 1,005 0.06% 0.08% 51 0 0.0% Q4 2025 Feb 17, 2026
BOOTHBAY FUND MANAGEMENT, LLC History No change 83,391 838 0.01% 0.01% 52 0 0.0% Q4 2025 Feb 17, 2026
GRITSTONE ASSET MANAGEMENT LLC History No change 69,324 696 0.66% 0.71% 53 0 0.0% Q4 2025 Jan 23, 2026
Timelo Investment Management Inc. History No change 60,000 613 0.22% 0.23% 54 0 0.0% Q4 2025 Feb 13, 2026
MIZUHO SECURITIES USA LLC History Reduced 50,924 513 0.01% 0.06% 55 -250,378 -83.1% Q4 2025 Feb 09, 2026
Centiva Capital, LP History No change 50,000 503 0.0% 0.0% 56 0 0.0% Q4 2025 Feb 13, 2026
Virtu Financial LLC History Reduced 34,201 344 0.01% 0.14% 57 -226,925 -86.9% Q4 2025 Feb 23, 2026
Stoic Point Capital Management LLC History New 33,775 339 0.29% 58 +33,775 New Q4 2025 Feb 17, 2026
READYSTATE ASSET MANAGEMENT LP History No change 31,492 321 0.01% 0.01% 59 0 0.0% Q4 2025 Feb 17, 2026
HRT FINANCIAL LP History Reduced 25,000 255 0.0% 0.0% 60 -8,158 -24.6% Q4 2025 Feb 12, 2026
Yakira Capital Management, Inc. History No change 25,000 255 0.09% 0.09% 61 0 0.0% Q4 2025 Feb 13, 2026
ABC ARBITRAGE SA History New 25,000 251 0.02% 62 +25,000 New Q4 2025 Feb 04, 2026
L1 Global Manager Pty Ltd History New 24,400 245 0.16% 63 +24,400 New Q4 2025 Feb 13, 2026
Rangeley Capital, LLC History Reduced 22,145 226 0.19% 0.19% 64 -12 -0.05% Q4 2025 Feb 17, 2026
PenderFund Capital Management Ltd. History No change 17,400 175 0.03% 0.03% 65 0 0.0% Q4 2025 Feb 17, 2026
DELTEC ASSET MANAGEMENT LLC History No change 10,000 100 0.02% 0.02% 66 0 0.0% Q4 2025 Jan 29, 2026
FNY Investment Advisers, LLC History New 1,000 10 0.0% 67 +1,000 New Q4 2025 Jan 16, 2026
LONGFELLOW INVESTMENT MANAGEMENT CO LLC History No change 500 5 0.0% 0.0% 68 0 0.0% Q4 2025 Feb 11, 2026
Alpine Global Management, LLC History Closed out 0 0 0.46% -225,000 -100.0% Q3 2025 Nov 21, 2025
StoneX Group Inc. History Closed out 0 0 0.07% -155,000 -100.0% Q3 2025 Nov 14, 2025
Parallax Volatility Advisers, L.P. History Closed out 0 0 0.0% -58,744 -100.0% Q3 2025 Nov 14, 2025
CANTOR FITZGERALD, L. P. History Closed out 0 0 0.0% -36,894 -100.0% Q3 2025 Feb 17, 2026
UBS Group AG History Reduced 10 0 0.0% -540 -98.18% Q4 2025 Jan 29, 2026
MORGAN STANLEY History New 67 0 +67 New Q4 2025 Feb 13, 2026