GPAT · GP-Act III Acquisition Corp.

$10.93 At close · Aug 19

Market Cap

$180.36M

16.16M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 42

Total Value: $96,364,410

Total Shares: 20,946,694

Institutional Ownership Trend

9 quarters

Holder Concentration

Across 42 13F filers · Δ vs Mar 31, 2026

Top Holder

20.3%

+11.9 pts

Top 5

68.1%

+34.4 pts

Top 10

89.8%

+33.3 pts

HHI

1,150

Broadly held+720

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -23

Institutional value: -66.5%

Shares held: -47.2%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid Polar Asset Management Partners Inc.	+625,004	3,037,500
Mid MIZUHO SECURITIES USA LLC	+498,388	558,486
Small HGC Investment Management Inc.	+399,387	399,387
Large Verition Fund Management LLC	+171,297	624,285
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	+149,950	1,087,450

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Large LMR Partners LLP	−1,225,000	612,500
Large PICTON MAHONEY ASSET MANAGEMENT	−1,125,000	1,187,500
Mid Linden Advisors LP	−797,584	360,400
Mid Alberta Investment Management Corp	−625,000	1,812,500
Small Radcliffe Capital Management, L.P.	−623,267	13,070

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)	Open
Large HRT FINANCIAL LP	14,965	$162,669
Mid Arax Advisory Partners	22,600	$0

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mid Karpus Management, Inc.	2,230,216	$24,175,541
Mid First Trust Capital Management L.P.	2,301,077	$22,667,274
Mega D. E. Shaw & Co., Inc.	1,423,125	$15,426,675
Small Wealthspring Capital LLC	1,770,903	$10,915,218
Mid Westchester Capital Management, LLC	860,852	$9,331,634

Filter: New 2 Increased 11 Reduced 19 Sold out 25 Unchanged 10

Showing 57 of 57

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Polar Asset Management Partners Inc.

$19,566,000

20.30%

1,800,000

AQR Arbitrage LLC

$15,218,000

15.79%

1,400,000

MMCAP International Inc. SPC

$13,859,250

14.38%

1,275,000

Alberta Investment Management Corp

$10,870,000

11.28%

1,000,000

MIZUHO SECURITIES USA LLC

$6,070,742

6.30%

558,486

BERKLEY W R CORP

$5,403,085

5.61%

497,064

HGC Investment Management Inc.

$4,341,336

4.51%

399,387

Verition Fund Management LLC

$4,335,879

4.50%

398,885

TORONTO DOMINION BANK

$3,752,117

3.89%

345,181

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	345,181	$3,752,117	100.0%	Defined

DEUTSCHE BANK AG\

$3,152,300

3.27%

290,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investment GmbH	240,000	$2,608,800	82.8%	Defined
Deutsche Oppenheim Family Office AG	50,000	$543,500	17.2%	Defined

PICTON MAHONEY ASSET MANAGEMENT

$2,717,500

2.82%

250,000

Periscope Capital Inc.

$1,630,500

1.69%

150,000

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND

$1,629,956

1.69%

149,950

JPMORGAN CHASE & CO

$1,085,478

1.13%

99,860

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	99,860	$1,085,478	100.0%	Defined

Lineage Point Capital LP

$704,321

0.73%

64,795

MOORE CAPITAL MANAGEMENT, LP

$543,500

0.56%

50,000

Kepos Capital LP

$461,975

0.48%

42,500

GEODE CAPITAL MANAGEMENT, LLC

$232,204

0.24%

21,362

CITADEL ADVISORS LLC

$217,823

0.23%

20,039

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	20,039	$217,823	100.0%	Defined

Clear Street Group Inc. GPATU

$181,005

0.19%

16,485

HRT FINANCIAL LP

$162,669

0.17%

14,965

Clear Street Group Inc.

$99,949

0.10%

9,195

LONGFELLOW INVESTMENT MANAGEMENT CO LLC

$84,786

0.09%

7,800

UBS Group AG GPATU

$43,590

0.05%

3,970

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Securities LLC	3,970	$43,590	100.0%	Defined

MORGAN STANLEY

$250

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY CAPITAL SERVICES, LLC	23	$250	100.0%	Defined

UBS Group AG

$195

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Securities LLC	18	$195	100.0%	Defined

Shaolin Capital Management LLC GPATW

—

294,650

Lepercq De Neuflize Asset Management LLC GPATW

—

250,000

Linden Advisors LP GPATW

—

360,400

Polar Asset Management Partners Inc. GPATW

—

1,237,500

Harraden Circle Investments, LLC GPATW

—

1,520,737

PICTON MAHONEY ASSET MANAGEMENT GPATW

—

937,500

METEORA CAPITAL, LLC GPATW

—

200,000

AQR Arbitrage LLC GPATW

—

458,963

DLD Asset Management, LP GPATW

—

90,500

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND GPATW

—

937,500

RIVERNORTH CAPITAL MANAGEMENT, LLC GPATW

—

225,599

MMCAP International Inc. SPC GPATW

—

1,037,500

Lineage Point Capital LP GPATW

—

575,477

BNP PARIBAS ARBITRAGE, SA GPATW

—

30,923

Clear Street Group Inc. GPATW

—

198,794

SUSQUEHANNA INTERNATIONAL GROUP, LLP GPATW

—

17,600

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
G1 EXECUTION SERVICES, LLC	17,600	$0	—	Other

LONGFELLOW INVESTMENT MANAGEMENT CO LLC GPATW

—

3,900

Radcliffe Capital Management, L.P. GPATW

—

13,070

MOORE CAPITAL MANAGEMENT, LP GPATW

—

100,000

Arax Advisory Partners GPATW

—

22,600

L1 Global Manager Pty Ltd GPATW

—

110,325

Alberta Investment Management Corp GPATW

—

812,500

Schonfeld Strategic Advisors LLC GPATW

—

17,743

LMR Partners LLP GPATW

—

612,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR PARTNERS (DIFC) Ltd	612,500	$0	—	Sole

Verition Fund Management LLC GPATW

—

225,400

TORONTO DOMINION BANK GPATW

—

481,824

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	481,824	$0	—	Defined

Saba Capital Management, L.P. GPATW

—

193,229

CSS LLC/IL GPATW

—

441,672

GRITSTONE ASSET MANAGEMENT LLC GPATW

—

217,248

ARISTEIA CAPITAL, L.L.C. GPATW

—

245,375

Periscope Capital Inc. GPATW

—

210,700

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	1,423,125	$15,426,675	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WESTCHESTER CAPITAL PARTNERS, LLC	1,420	$15,392	0.2%	Sole
Virtus Investment Advisers, LLC	839,883	$9,104,331	97.6%	Other
Held directly	19,549	$211,911	2.3%	Sole

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	745,440	$8,080,569	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
CVI Investments, Inc.	388,719	$4,213,713	100.0%	Other

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SONA ASSET MANAGEMENT (UK) LLP	200,000	$2,168,000	100.0%	Other

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	137,739	$1,493,090	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	80,000	$867,200	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Karpus Management Inc.	46,400	$502,976	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	900	$9,756	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
National Bank Financial Inc.	109	$0	—	Defined

Key facts CIK 1834526 CUSIP G4035N103 13F (30d) 44 filings 44 filers Visit website