Who owns PACHWhat PACH owns — n/a

Who owns Pioneer Acquisition I Corp?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.

Institutional ownership of PACH from SEC Form 13F filings across 53 reporting managers. All positions are from one synchronized reporting period — 2026-03-31 books, filed up to 45 days after quarter end — so every row is comparable.

As of the 2026-03-31 reporting period, 53 institutions disclosed 20.8M shares of Pioneer Acquisition I Corp worth $207.5M; the largest disclosed holder is Westchester Capital Management, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.

13F holders

$207.5M

value, 2026 filers

20.8M

shares disclosed

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-03-31 · % of fund = share of the manager's own book · % of co. = share of PACH's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	Westchester Capital Management, LLC	1.3M	$12.8M	0.6%	—	—
2	D. E. Shaw & Co., Inc.	1.3M	$12.7M	0.0%	—	—
3	GLAZER CAPITAL, LLC	1.2M	$12.3M	0.3%	—	—
4	Magnetar Financial LLC	1.0M	$10.2M	0.1%	—	—
5	LINDEN ADVISORS LP	1.0M	$10.2M	0.1%	—	—
6	AQR Arbitrage LLC	948,381	$9.6M	0.2%	—	—
7	TWO SIGMA INVESTMENTS, LP	797,500	$8.1M	0.0%	—	—
8	MMCAP International Inc. SPC	750,000	$7.6M	0.7%	—	—
9	WOLVERINE ASSET MANAGEMENT LLC	702,778	$7.1M	0.1%	—	—
10	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	650,000	$6.6M	0.0%	—	—
11	Radcliffe Capital Management, L.P.	629,247	$6.4M	0.5%	—	—
12	TENOR CAPITAL MANAGEMENT Co., L.P.	600,000	$6.1M	0.1%	—	—
13	Verition Fund Management LLC	525,558	$5.3M	0.0%	—	—
14	Karpus Management, Inc.	501,988	$5.1M	0.2%	—	—
15	Alberta Investment Management Corp	500,000	$5.1M	0.0%	—	—
16	Jain Global LLC	499,979	$5.1M	0.0%	—	—
17	PICTON MAHONEY ASSET MANAGEMENT	500,000	$5.1M	0.0%	—	—
18	First Trust Capital Management L.P.	500,000	$5.1M	0.3%	—	—
19	Shaolin Capital Management LLC	500,000	$5.1M	0.2%	—	—
20	MANGROVE PARTNERS	450,000	$4.6M	0.4%	—	—
21	OMERS ADMINISTRATION Corp	440,000	$4.5M	0.0%	—	—
22	ARISTEIA CAPITAL LLC	400,000	$4.1M	0.1%	—	—
23	Polar Asset Management Partners Inc.	400,000	$4.1M	0.1%	—	—
24	Mint Tower Capital Management B.V.	400,000	$4.1M	0.4%	—	—
25	BNP PARIBAS ARBITRAGE, SNC	348,493	$3.5M	0.0%	—	—

Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.