Who Owns GP ACT III ACQUISITION A (GPAT)? -- Institutional Holders (2026-06-30)

54 institutions reported holding $96.9M of GP ACT III ACQUISITION A (GPAT) in SEC 13F filings for 2026-06-30. Largest institutional holders: Polar Asset Management Partners Inc. ($19.6M), AQR Arbitrage LLC ($15.2M), MMCAP International Inc. SPC ($13.9M), Alberta Investment Management Corp ($10.9M), MIZUHO SECURITIES USA LLC ($6.7M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	Polar Asset Management Partners Inc.	$19.6M	1.8M	Added
2	AQR Arbitrage LLC	$15.2M	1.4M	Trimmed
3	MMCAP International Inc. SPC	$13.9M	1.3M	Hold
4	Alberta Investment Management Corp	$10.9M	1.0M	Trimmed
5	MIZUHO SECURITIES USA LLC	$6.7M	618,584	Added
6	BERKLEY W R CORP	$5.4M	497,064	Trimmed
7	Verition Fund Management LLC	$4.3M	398,885	Added
8	HGC Investment Management Inc.	$4.3M	399,387	New
9	TORONTO DOMINION BANK	$3.8M	345,181	Trimmed
10	DEUTSCHE BANK AG\	$3.1M	290,000	Hold
11	PICTON MAHONEY ASSET MANAGEMENT	$2.7M	250,000	Trimmed
12	Periscope Capital Inc.	$1.7M	150,000	Trimmed
13	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	$1.6M	149,950	New
14	JPMORGAN CHASE & CO	$1.1M	99,860	Trimmed
15	Lineage Point Capital LP	$715,985	64,795	Trimmed
16	MOORE CAPITAL MANAGEMENT, LP	$543,500	50,000	Trimmed
17	Kepos Capital LP	$470,000	42,500	Hold
18	GEODE CAPITAL MANAGEMENT, LLC	$232,632	21,362	Added
19	CITADEL ADVISORS LLC	$218,225	20,039	Added
20	HRT FINANCIAL LP	$162,000	14,965	New
21	Clear Street Group Inc.	$99,950	9,195	Trimmed
22	LONGFELLOW INVESTMENT MANAGEMENT CO LLC	$84,786	7,800	Hold
23	MORGAN STANLEY	$250	23	Trimmed
24	UBS Group AG	$195	18	Trimmed
25	Royal Bank of Canada	$0	0	Exited

Source: SEC Form 13F filings · as of 2026-06-30