13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger

PIONEER ACQUISITION I CORP

62 institutions still hold PIONEER ACQUISITION I CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G7117W107·62 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 1.2%
vs prior quarter
13F value held
$141M
77.0% inst. owned
of float
Holders
62
+72 QoQ
filers reporting
Activity
+73 / −86
+947 added · −805 reduced
this quarter
Concentration
9.09%
Westchester Capital Management, LLC #1
top holder share
AI Holders Summary · Q1 2026

62 institutions reported PIONEER ACQUISITION I CORP in Q1 2026. Westchester Capital Management, LLC leads at 9.1% of the visible book. +72 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Westchester Capital Management, LLC
CIK 0001512805
$13M1.3M0.58%Q1 202602
D. E. Shaw & Co., Inc.
CIK 0001009207
$13M1.3M0.01%Q4 202503
LINDEN ADVISORS LP
CIK 0001279396
$10M1.0M0.06%Q1 202604
AQR Arbitrage LLC
CIK 0001167456
$10M985K0.21%Q4 202505
Wealthspring Capital LLC
CIK 0001844495
$9M842K2.02%Q1 202606
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$8M798K0.01%Q1 202607
MMCAP International Inc. SPC
CIK 0001304857
$8M750K0.66%Q1 202608
WOLVERINE ASSET MANAGEMENT LLC
CIK 0001279891
$7M703K0.07%Q1 202609
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
CIK 0001535845
$7M650K0.01%Q1 202610
Radcliffe Capital Management, L.P.
CIK 0001218275
$6M629K0.48%Q1 202611
TENOR CAPITAL MANAGEMENT Co., L.P.
CIK 0001346554
$6M600K0.09%Q1 202612
Verition Fund Management LLC
CIK 0001454027
$5M526K0.03%Q1 202613
Karpus Management, Inc.
CIK 0001048703
$5M502K0.16%Q1 202614
Alberta Investment Management Corp
CIK 0001463559· Sovereign
$5M500K0.03%Q1 202615
Jain Global LLC
CIK 0002024579
$5M500K0.02%Q1 202616
PICTON MAHONEY ASSET MANAGEMENT
CIK 0001539041
$5M500K0.04%Q1 202617
First Trust Capital Management L.P.
CIK 0001604488
$5M500K0.27%Q1 202618
Shaolin Capital Management LLC
CIK 0001766806
$5M500K0.19%Q1 202619
MANGROVE PARTNERS IM, LLC
CIK 0001535392
$5M450K0.37%Q1 202620
OMERS ADMINISTRATION Corp
CIK 0001053321
$4M440K0.03%Q1 2026
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