# PIONEER ACQUISITION I CORP (PACH)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/PACH/

- Reporting holders: 67
- Reported value: $235.5M
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Westchester Capital Management, LLC](https://holderbook.com/funds/1512805-westchester-capital-management-llc/) | $12.9M | 1,258,612 | 0.6% | 4 |
| [D. E. Shaw & Co., Inc.](https://holderbook.com/funds/1009207-d-e-shaw-co-inc/) | $12.8M | 1,252,350 | 0.0% | 4 |
| [GLAZER CAPITAL, LLC](https://holderbook.com/funds/1076809-glazer-capital-llc/) | $12.4M | 1,210,643 | 0.3% | 4 |
| [Verition Fund Management LLC](https://holderbook.com/funds/1454027-verition-fund-management-llc/) | $10.7M | 1,051,116 | 0.0% | 4 |
| [Linden Advisors LP](https://holderbook.com/funds/1279396-linden-advisors-lp/) | $10.2M | 1,000,000 | 0.1% | 4 |
| [Magnetar Financial LLC](https://holderbook.com/funds/1352851-magnetar-financial-llc/) | $10.2M | 1,000,000 | 0.1% | 3 |
| [AQR Arbitrage LLC](https://holderbook.com/funds/1167456-aqr-arbitrage-llc/) | $9.8M | 956,895 | 0.1% | 4 |
| [TWO SIGMA INVESTMENTS, LP](https://holderbook.com/funds/1179392-two-sigma-investments-lp/) | $8.2M | 797,500 | 0.0% | 4 |
| [WOLVERINE ASSET MANAGEMENT LLC](https://holderbook.com/funds/1279891-wolverine-asset-management-llc/) | $8.1M | 788,462 | 0.1% | 4 |
| [Wealthspring Capital LLC](https://holderbook.com/funds/1844495-wealthspring-capital-llc/) | $7.9M | 776,258 | 1.8% | 4 |
| [MMCAP International Inc. SPC](https://holderbook.com/funds/1304857-mmcap-international-inc-spc/) | $7.7M | 750,000 | 0.7% | 3 |
| [Radcliffe Capital Management, L.P.](https://holderbook.com/funds/1218275-radcliffe-capital-management-l-p/) | $6.4M | 629,549 | 0.5% | 4 |
| [TENOR CAPITAL MANAGEMENT Co., L.P.](https://holderbook.com/funds/1346554-tenor-capital-management-co-l-p/) | $6.1M | 600,000 | 0.1% | 4 |
| [Karpus Management, Inc.](https://holderbook.com/funds/1048703-karpus-management-inc/) | $5.6M | 551,988 | 0.2% | 4 |
| [PICTON MAHONEY ASSET MANAGEMENT](https://holderbook.com/funds/1539041-picton-mahoney-asset-management/) | $5.1M | 500,000 | 0.0% | 4 |
| [First Trust Capital Management L.P.](https://holderbook.com/funds/1604488-first-trust-capital-management-l-p/) | $5.1M | 500,000 | 0.3% | 4 |
| [Alberta Investment Management Corp](https://holderbook.com/funds/1463559-alberta-investment-management-corp/) | $5.1M | 500,000 | 0.0% | 3 |
| [MANGROVE PARTNERS IM, LLC](https://holderbook.com/funds/1535392-mangrove-partners-im-llc/) | $4.6M | 450,000 | 0.3% | 4 |
| [HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND](https://holderbook.com/funds/1535845-healthcare-of-ontario-pension-plan-trust-fund/) | $4.6M | 450,000 | 0.0% | 4 |
| [OMERS ADMINISTRATION Corp](https://holderbook.com/funds/1053321-omers-administration-corp/) | $4.5M | 440,000 | 0.0% | 3 |
| [ARISTEIA CAPITAL, L.L.C.](https://holderbook.com/funds/1080171-aristeia-capital-l-l-c/) | $4.1M | 400,000 | 0.1% | 4 |
| [COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS](https://holderbook.com/funds/1083190-commonwealth-of-pennsylvania-public-school-empls-retrmt-sys/) | $4.1M | 400,000 | 0.0% | 4 |
| [Polar Asset Management Partners Inc.](https://holderbook.com/funds/1326389-polar-asset-management-partners-inc/) | $4.1M | 400,000 | 0.1% | 4 |
| [Mint Tower Capital Management B.V.](https://holderbook.com/funds/1666606-mint-tower-capital-management-b-v/) | $4.1M | 400,000 | 0.5% | 3 |
| [Jain Global LLC](https://holderbook.com/funds/2024579-jain-global-llc/) | $3.9M | 386,736 | 0.0% | 3 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 67 | $235.5M |
| Q1 2026 | 61 | $226.2M |
| Q4 2025 | 59 | $218.6M |
| Q3 2025 | 44 | $174.3M |