Who owns Pioneer Acquisition I (PACH)
Which tracked institutional funds hold PACH, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PACH company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-17). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
5 tracked funds added or opened PACH while 12 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
PACH’s largest tracked holder by dollar value, TENOR CAPITAL MANAGEMENT Co., L.P., sizes it at 0.8% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in PACH divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 68 tracked filers holding PACH, 11 increased or opened the position and 17 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in PACH between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 2
- MIZUHO SECURITIES USA LLC$2M
- Logan Stone Capital, LLC$621K
Full exits 6
- TENOR CAPITAL MANAGEMENT Co., L.P.$60M
- Lepercq De Neuflize Asset Management LLC$48M
- METEORA CAPITAL, LLC$37M
- GLAZER CAPITAL, LLC$12M
- Mint Tower Capital Management B.V.$6M
- SYQUANT CAPITAL SAS$1M
Largest adds
- WOLVERINE ASSET MANAGEMENT LLC$929K
- Karpus Management, Inc.$562K
- Parallax Volatility Advisers, L.P.$366K
Largest trims
- Context Capital Management, LLC$13M
- TORONTO DOMINION BANK$4M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$2M
- Shaolin Capital Management LLC$1M
- Jain Global LLC$1M
- Wealthspring Capital LLC$568K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Westchester Capital Management, LLC | 1,258,612 | $13M | 3.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. | 1,252,350 | $13M | 3.1% | 2026-Q2 |
| Linden Advisors LP | 1,000,000 | $10M | 2.5% | 2026-Q2 |
| Magnetar Financial LLC | 1,000,000 | $10M | 2.5% | 2026-Q2 |
| AQR Arbitrage LLC added | 956,895 | $10M | 2.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP | 797,500 | $8M | 2.0% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC added | 788,462 | $8M | 2.0% | 2026-Q2 |
| Wealthspring Capital LLC trimmed | 776,258 | $8M | 1.9% | 2026-Q2 |
| LMR Partners LLP | 750,000 | $8M | 1.9% | 2026-Q2 |
| MMCAP International Inc. SPC | 750,000 | $8M | 1.9% | 2026-Q2 |
| HGC Investment Management Inc. | 743,077 | $8M | 1.9% | 2026-Q2 |
| Radcliffe Capital Management, L.P. added | 629,549 | $6M | 1.6% | 2026-Q2 |
| Karpus Management, Inc. added | 551,988 | $6M | 1.4% | 2026-Q2 |
| Verition Fund Management LLC | 525,558 | $5M | 1.3% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT | 500,000 | $5M | 1.2% | 2026-Q2 |
| First Trust Capital Management L.P. | 500,000 | $5M | 1.2% | 2026-Q2 |
| Alberta Investment Management Corp | 500,000 | $5M | 1.2% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC | 450,000 | $5M | 1.1% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 450,000 | $5M | 1.1% | 2026-Q2 |
| OMERS ADMINISTRATION Corp | 440,000 | $4M | 1.1% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 400,000 | $4M | 1.0% | 2026-Q2 |
| Polar Asset Management Partners Inc. | 400,000 | $4M | 1.0% | 2026-Q2 |
| ARISTEIA CAPITAL, L.L.C. | 400,000 | $4M | 1.0% | 2026-Q2 |
| Jain Global LLC trimmed | 386,736 | $4M | 1.0% | 2026-Q2 |
| Shaolin Capital Management LLC trimmed | 377,218 | $4M | 0.9% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 348,493 | $4M | 0.9% | 2026-Q2 |
| Periscope Capital Inc. | 300,000 | $3M | 0.7% | 2026-Q2 |
| WHITEBOX ADVISORS LLC | 300,000 | $3M | 0.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 287,700 | $3M | 0.7% | 2026-Q2 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 249,758 | $3M | 0.6% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP | 250,000 | $3M | 0.6% | 2026-Q2 |
| O'Connor Alternative Investments LLC | 250,000 | $3M | 0.6% | 2026-Q2 |
| Ghisallo Capital Management LLC | 250,000 | $3M | 0.6% | 2026-Q2 |
| Hudson Bay Capital Management LP | 246,000 | $3M | 0.6% | 2026-Q2 |
| CSS LLC/IL | 210,988 | $2M | 0.5% | 2026-Q2 |
| MIZUHO SECURITIES USA LLC added | 183,497 | $2M | 0.5% | 2026-Q2 |
| Context Capital Management, LLC added | 150,000 | $2M | 0.4% | 2026-Q2 |
| TIG Advisors, LLC | 150,000 | $2M | 0.4% | 2026-Q2 |
| BERKLEY W R CORP | 148,726 | $2M | 0.4% | 2026-Q2 |
| Clear Street Group Inc. trimmed | 139,861 | $1M | 0.3% | 2026-Q2 |
| Parallax Volatility Advisers, L.P. added | 129,909 | $1M | 0.3% | 2026-Q2 |
| TORONTO DOMINION BANK trimmed | 125,000 | $1M | 0.3% | 2026-Q2 |
| SONA ASSET MANAGEMENT (US) LLC | 111,059 | $1M | 0.3% | 2026-Q2 |
| Lineage Point Capital LP | 106,805 | $1M | 0.3% | 2026-Q2 |
| Dakota Wealth Management | 104,100 | $1M | 0.3% | 2026-Q2 |
| DLD Asset Management, LP trimmed | 102,737 | $1M | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO | 100,000 | $1M | 0.3% | 2026-Q2 |
| Governors Lane LP | 100,000 | $1M | 0.2% | 2026-Q2 |
| HEIGHTS CAPITAL MANAGEMENT, INC | 100,000 | $1M | 0.2% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC | 83,391 | $853K | 0.2% | 2026-Q2 |
| GRITSTONE ASSET MANAGEMENT LLC | 69,324 | $709K | 0.2% | 2026-Q2 |
| Logan Stone Capital, LLC new | 60,737 | $621K | 0.2% | 2026-Q2 |
| Timelo Investment Management Inc. | 60,000 | $614K | 0.1% | 2026-Q2 |
| Centiva Capital, LP | 50,000 | $510K | 0.1% | 2026-Q2 |
| Limestone Investment Advisors LP new | 48,017 | $491K | 0.1% | 2026-Q2 |
| PenderFund Capital Management Ltd. added | 38,172 | $390K | 0.1% | 2026-Q2 |
| Stoic Point Capital Management LLC | 33,775 | $346K | 0.1% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP | 31,492 | $325K | 0.1% | 2026-Q2 |
| ABC ARBITRAGE SA | 25,000 | $256K | 0.1% | 2026-Q2 |
| Yakira Capital Management, Inc. | 24,485 | $253K | 0.1% | 2026-Q2 |
| L1 Global Manager Pty Ltd | 24,400 | $250K | 0.1% | 2026-Q2 |
| Rangeley Capital, LLC trimmed | 21,345 | $220K | 0.1% | 2026-Q2 |
| Arax Advisory Partners new | 10,500 | $107K | 0.0% | 2026-Q2 |
| DELTEC ASSET MANAGEMENT LLC | 10,000 | $102K | 0.0% | 2026-Q2 |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 500 | $5K | 0.0% | 2026-Q2 |
| Endure Capital Management, LLC | 22,400 | $5K | 0.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 49 | $501 | 0.0% | 2026-Q2 |
| UBS Group AG trimmed | 1,529 | $330 | 0.0% | 2026-Q2 |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 300,000 | $54M | 13.2% | 2026-Q1 stale (1 quarter behind) |
| Lepercq De Neuflize Asset Management LLC | 266,000 | $48M | 11.7% | 2026-Q1 stale (1 quarter behind) |
| METEORA CAPITAL, LLC trimmed | 205,337 | $37M | 9.0% | 2026-Q1 stale (1 quarter behind) |
| GLAZER CAPITAL, LLC added | 1,210,643 | $12M | 3.0% | 2026-Q1 stale (1 quarter behind) |
| Mint Tower Capital Management B.V. | 400,000 | $4M | 1.0% | 2026-Q1 stale (1 quarter behind) |
| SYQUANT CAPITAL SAS | 110,000 | $1M | 0.3% | 2026-Q1 stale (1 quarter behind) |
| Kepos Capital LP new | 47,100 | $478K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| HRT FINANCIAL LP | 25,000 | $255K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| FNY Investment Advisers, LLC | 1,000 | $10K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Virtu Financial LLC trimmed | 34,201 | $344K | 0.1% | 2025-Q4 stale (2 quarters behind) |
| ATW SPAC MANAGEMENT LLC trimmed | 52,500 | $12M | 2.8% | 2025-Q3 stale (3 quarters behind) |
| Alpine Global Management, LLC trimmed | 225,000 | $2M | 0.6% | 2025-Q3 stale (3 quarters behind) |
| StoneX Group Inc. trimmed | 155,000 | $2M | 0.4% | 2025-Q3 stale (3 quarters behind) |
| CANTOR FITZGERALD, L. P. added | 1,738,825 | $383K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| Sculptor Capital LP new | 150,000 | $32K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| CLEAR STREET LLC new | 597,955 | $6M | 1.5% | 2025-Q2 stale (4 quarters behind) |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC new | 499,200 | $5M | 1.2% | 2025-Q2 stale (4 quarters behind) |
| Saba Capital Management, L.P. new | 298,473 | $3M | 0.7% | 2025-Q2 stale (4 quarters behind) |
| CITADEL ADVISORS LLC new | 56,128 | $562K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| Bulldog Investors, LLP new | 55,000 | $550K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| Crossingbridge Advisors, LLC new | 48,776 | $488K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| Decagon Asset Management LLP new | 34,614 | $346K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. new | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
1 parent filing withheld from the table above, and from the coverage figures, to avoid listing one book twice: OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) (last filed 2025-Q4, 250,000 shares) reconciles to its 1 current affiliate (250,000 shares) — 0.000% apart.
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.