Who Owns GP-ACT III ACQUISITION CORP (GPAT)? -- Institutional Holders (2026-06-30)
54 institutions reported holding $96.9M of GP-ACT III ACQUISITION CORP (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 | Radcliffe Capital Management, L.P. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30