Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in PACH held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Westchester Capital Management, LLC | 1.3M | $12.8M | +208.0% | 22883.855% | 0.61% |
| 2 | D. E. Shaw & Co., Inc. | 1.3M | $12.7M | 0.0% | 22770.000% | 0.01% |
| 3 | Magnetar Financial LLC | 1.0M | $10.2M | 0.0% | 18181.818% | 0.10% |
| 4 | LINDEN ADVISORS LP | 1.0M | $10.2M | 0.0% | 18181.818% | 0.06% |
| 5 | CNH PARTNERS LLC | 948K | $9.6M | -3.7% | 17243.291% | 0.16% |
| 6 | Wealthspring Capital LLC | 842K | $8.5M | -1.0% | 15300.145% | 2.02% |
| 7 | TWO SIGMA INVESTMENTS, LP | 798K | $8.1M | 0.0% | 14500.000% | 0.01% |
| 8 | MMCAP International Inc. SPC | 750K | $7.6M | 0.0% | 13636.364% | 0.66% |
| 9 | WOLVERINE ASSET MANAGEMENT LLC | 703K | $7.1M | +37.1% | 12777.782% | 0.12% |
| 10 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 650K | $6.6M | 0.0% | 11818.182% | 0.01% |
| 11 | Radcliffe Capital Management, L.P. | 629K | $6.4M | 0.0% | 11440.855% | 0.48% |
| 12 | TENOR CAPITAL MANAGEMENT Co., L.P. | 600K | $6.1M | 0.0% | 10909.091% | 0.09% |
| 13 | Verition Fund Management LLC | 526K | $5.3M | -3.4% | 9555.600% | 0.04% |
| 14 | Karpus Management, Inc. | 502K | $5.1M | — | 9127.055% | 0.16% |
| 15 | Alberta Investment Management Corp | 500K | $5.1M | 0.0% | 9090.909% | 0.03% |
| 16 | Jain Global LLC | 500K | $5.1M | 0.0% | 9090.527% | 0.02% |
| 17 | PICTON MAHONEY ASSET MANAGEMENT | 500K | $5.1M | 0.0% | 9090.909% | 0.05% |
| 18 | Vivaldi Asset Management, LLC | 500K | $5.1M | 0.0% | 9090.909% | 0.27% |
| 19 | Shaolin Capital Management LLC | 500K | $5.1M | 0.0% | 9090.909% | 0.21% |
| 20 | MANGROVE PARTNERS | 450K | $4.6M | 0.0% | 8181.818% | 0.37% |
| 21 | OMERS ADMINISTRATION Corp | 440K | $4.5M | 0.0% | 8000.000% | 0.03% |
| 22 | COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 400K | $4.1M | 0.0% | 7272.727% | 0.02% |
| 23 | ARISTEIA CAPITAL LLC | 400K | $4.1M | 0.0% | 7272.727% | 0.09% |
| 24 | Polar Asset Management Partners Inc. | 400K | $4.1M | -20.0% | 7272.727% | 0.09% |
| 25 | BNP PARIBAS ARBITRAGE, SA | 348K | $3.5M | +13.0% | 6336.236% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in PACH — a direct measure of their conviction.
Filings activity in PACH during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new PACH position in Q1 2026
Institutions that fully closed their PACH position in Q1 2026
3 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 61 | +5.2% | 199.99% | +0.00 pp | $209M | +5.3% |
| Q4 2025 | 58 | +35% | 199.99% | +0.00 pp | $199M | +29% |
| Q3 2025 | 43 | — | 199.99% | — | $154M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying PACH stock.
Based on Q1 2026 13F filings, institutional ownership of Pioneer Acquisition I Corp. stands at 200.0%, held across 61 reporting institutions.
Westchester Capital Management, LLC is the largest reported institutional holder of PACH, with approximately 1,258,612 shares worth $0.01B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of PACH, including TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for PACH is 53 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
7 institutions opened new positions in PACH during Q1 2026, while 4 fully exited. 45 added to existing positions and 8 trimmed.
PACH institutional ownership rose by 0.00 percentage points quarter-over-quarter, with a net change of +3 holders.
The top 10 institutions account for 44.6% of all reported 13F value in PACH, and the top 25 account for 79.5%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Pioneer Acquisition I Corp. (PACH) Institutional Ownership