Pioneer Acquisition I Corp - PACH

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q1 2026 · Compare: Q4 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 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