Ownership

Who owns Pioneer Acquisition I Corp, from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).

Stakes over 5%

Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.

Westchester Capital Management, LLC, Westchester Capital Partners, LLC, Virtus Investment Advisers, LLC May 15, 2026

Westchester Capital Management, LLC: 5.7% · 1,248,504 shares — Westchester Capital Partners, LLC: 0.1% · 10,108 shares — Virtus Investment Advisers, LLC: 5.2% · 1,152,746 shares

View filing (SCHEDULE 13G)

D. E. Shaw & Co., L.P., D. E. Shaw & Co., L.L.C., D. E. Shaw Valence Portfolios, L.L.C. May 15, 2026

D. E. Shaw & Co., L.P.: 5.7% · 1,252,350 shares — D. E. Shaw & Co., L.L.C.: 5.7% · 1,252,350 shares — D. E. Shaw Valence Portfolios, L.L.C.: 5.7% · 1,252,350 shares

View filing (SCHEDULE 13G)

3 more 5% stakes behind a free account

See every investor who has disclosed crossing 5% of Pioneer Acquisition I Corp.

Super investors holding PACH

Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Pioneer Acquisition I Corp they hold.

Investor	Position value	Shares	% of their portfolio	% of company	As of
Westchester Capital Management, LLC	$12.9M	1,258,612	0.63%	—	June 30, 2026
D. E. Shaw & Co., Inc.	$12.8M	1,252,350	0.01%	—	June 30, 2026

75 more institutional holders behind a free account

See every manager reporting Pioneer Acquisition I Corp, how much of the company they hold, and how big the position is inside their own portfolio.

Funds holding PACH

Funds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets.

Fund	Position value	% of net assets	% of company	As of
First Trust Merger Arbitrage Fund	$4.19M	0.27%	—	March 31, 2026
First Trust Multi-Strategy Fund	$860K	0.07%	—	March 31, 2026

2 more funds behind a free account

See every fund holding Pioneer Acquisition I Corp and what share of its net assets the position represents.