GP-Act III Acquisition Corp. (GPAT) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

35,937,500Shares Outstanding

30,529,719Shares held by institutions

$332,163,343Value of institutional holdings

84.95%Institutional ownership %

-3.58%Shares Changed QoQ

52No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

GP-Act III Acquisition Corp. (NASDAQ:GPAT) showed up in the 13F filings of 52 institutional investors as of December 2025.

They owned 84.6% of outstanding stock in December 2025, down from 88.3% the prior quarter.
Their total shares held in GPAT decreased -4.01% from the prior quarter, while the number of investors in GP-Act III Acquisition increased 20.93% year over year.
Of these 52 funds, 12 grew their exposure to GP-Act III Acquisition, 14 cut back, and 26 maintained positions.
Altogether, these fund groups held 30.39Mn shares in GPAT by December 2025, down by 1.27Mn shares quarter on quarter, and down 4.54Mn shares year over year.
As of December 31, 2025, the biggest holder of GP-Act III Acquisition is Alberta Investment Management Corp at 3.25Mn shares, representing 9.04% of shares outstanding.
The most significant purchases of GPAT for the quarter ending December 2025 came from L1 Global Manager Pty Ltd (567.57K), Westchester Capital Management, LLC (250.0K), Lineage Point Capital LP (239.79K), METEORA CAPITAL, LLC (157.69K), Goldman Sachs Group Inc (137.66K).
Leading sellers of GP-Act III Acquisition shares for the quarter ending December 2025 were Polar Asset Management Partners Inc. (1.17Mn), HEIGHTS CAPITAL MANAGEMENT, INC (847.43K), Toronto Dominion Bank (461.65K), OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) (100.0K), Jpmorgan Chase & Co (49.65K).
Per Business Quant data, the top 10 holders of GP-Act III Acquisition for the quarter ending December 2025 are Alberta Investment Management Corp (3.25Mn), Karpus Management, Inc. (2.33Mn), First Trust Capital Management L.P. (2.09Mn), PICTON MAHONEY ASSET MANAGEMENT (1.88Mn), AQR Arbitrage LLC (1.58Mn), D. E. Shaw & Co., Inc. (1.42Mn), HGC Investment Management Inc. (1.38Mn), Westchester Capital Management, LLC (1.36Mn), MMCAP International Inc. SPC (1.27Mn), LMR Partners LLP (1.22Mn).

52 Institutional Holders

30,529,719 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Alberta Investment Management Corp	31 Dec, 2025	3,250,000	0	0.00%	$34,775,000.00
Karpus Management, Inc.	31 Dec, 2025	2,331,866	25,050	1.09%	$24,927,648.00
First Trust Capital Management L.P.	31 Dec, 2025	2,091,077	0	0.00%	$22,353,613.00
PICTON MAHONEY ASSET MANAGEMENT	31 Dec, 2025	1,875,000	0	0.00%	$20,043,750.00
AQR Arbitrage LLC	31 Dec, 2025	1,576,119	0	0.00%	$16,864,473.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	1,423,125	0	0.00%	$15,227,437.00
HGC Investment Management Inc.	31 Dec, 2025	1,375,000	0	0.00%	$14,698,750.00
Westchester Capital Management, LLC	31 Dec, 2025	1,360,852	250,000	22.51%	$14,561,117.00
MMCAP International Inc. SPC	31 Dec, 2025	1,275,000	0	0.00%	$13,629,750.00
LMR Partners LLP	31 Dec, 2025	1,225,000	0	0.00%	$13,095,250.00
Polar Asset Management Partners Inc.	31 Dec, 2025	1,174,996	-1,174,996	-50.00%	$12,560,707.00
Wealthspring Capital LLC	31 Dec, 2025	1,018,282	-13,581	-1.32%	$10,885,435.00
WOLVERINE ASSET MANAGEMENT LLC	31 Dec, 2025	951,749	-3,117	-0.33%	$10,174,197.00
LINDEN ADVISORS LP	31 Dec, 2025	797,584	0	0.00%	$8,534,149.00
TENOR CAPITAL MANAGEMENT Co., L.P.	31 Dec, 2025	750,000	0	0.00%	$8,017,500.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	625,000	0	0.00%	$6,681,250.00
Radcliffe Capital Management, L.P.	31 Dec, 2025	573,222	327	0.06%	$6,127,743.00
L1 Global Manager Pty Ltd	31 Dec, 2025	567,566	567,566	0.00%	$6,067,281.00
ARISTEIA CAPITAL, L.L.C.	31 Dec, 2025	490,750	0	0.00%	$5,246,118.00
RIVERNORTH CAPITAL MANAGEMENT, LLC	31 Dec, 2025	420,111	-821	-0.20%	$4,490,986.00

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