# GP-ACT III ACQUISITION CORP (GPAT)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/GPAT/

- Reporting holders: 24
- Reported value: $101.4M
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Polar Asset Management Partners Inc.](https://holderbook.com/funds/1326389-polar-asset-management-partners-inc/) | $19.6M | 1,800,000 | 0.3% | 8 |
| [AQR Arbitrage LLC](https://holderbook.com/funds/1167456-aqr-arbitrage-llc/) | $15.2M | 1,400,000 | 0.2% | 8 |
| [MMCAP International Inc. SPC](https://holderbook.com/funds/1304857-mmcap-international-inc-spc/) | $13.9M | 1,275,000 | 1.2% | 8 |
| [Alberta Investment Management Corp](https://holderbook.com/funds/1463559-alberta-investment-management-corp/) | $10.9M | 1,000,000 | 0.1% | 5 |
| [Verition Fund Management LLC](https://holderbook.com/funds/1454027-verition-fund-management-llc/) | $8.7M | 797,770 | 0.0% | 8 |
| [MIZUHO SECURITIES USA LLC](https://holderbook.com/funds/812291-mizuho-securities-usa-llc/) | $6.7M | 618,584 | 0.1% | 5 |
| [BERKLEY W R CORP](https://holderbook.com/funds/11544-berkley-w-r-corp/) | $5.4M | 497,064 | 0.3% | 8 |
| [HGC Investment Management Inc.](https://holderbook.com/funds/1711200-hgc-investment-management-inc/) | $4.3M | 399,387 | 0.9% | 1 |
| [TORONTO DOMINION BANK](https://holderbook.com/funds/947263-toronto-dominion-bank/) | $3.8M | 345,181 | 0.0% | 7 |
| [DEUTSCHE BANK AG\](https://holderbook.com/funds/948046-deutsche-bank-ag/) | $3.1M | 290,000 | 0.0% | 8 |
| [PICTON MAHONEY ASSET MANAGEMENT](https://holderbook.com/funds/1539041-picton-mahoney-asset-management/) | $2.7M | 250,000 | 0.0% | 8 |
| [Periscope Capital Inc.](https://holderbook.com/funds/1695320-periscope-capital-inc/) | $1.7M | 150,000 | 0.1% | 8 |
| [HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND](https://holderbook.com/funds/1535845-healthcare-of-ontario-pension-plan-trust-fund/) | $1.6M | 149,950 | 0.0% | 1 |
| [JPMORGAN CHASE & CO](https://holderbook.com/funds/19617-jpmorgan-chase-co/) | $1.1M | 99,860 | 0.0% | 5 |
| [Lineage Point Capital LP](https://holderbook.com/funds/2093311-lineage-point-capital-lp/) | $716.0K | 64,795 | 0.1% | 3 |
| [MOORE CAPITAL MANAGEMENT, LP](https://holderbook.com/funds/1448574-moore-capital-management-lp/) | $543.5K | 50,000 | 0.0% | 8 |
| [Kepos Capital LP](https://holderbook.com/funds/1512020-kepos-capital-lp/) | $470.0K | 42,500 | 0.6% | 8 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $436.4K | 40,078 | 0.0% | 7 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $232.6K | 21,362 | 0.0% | 2 |
| [HRT FINANCIAL LP](https://holderbook.com/funds/1475597-hrt-financial-lp/) | $162.0K | 14,965 | 0.0% | 1 |
| [Clear Street Group Inc.](https://holderbook.com/funds/1881567-clear-street-group-inc/) | $100.0K | 9,195 | 0.0% | 4 |
| [LONGFELLOW INVESTMENT MANAGEMENT CO LLC](https://holderbook.com/funds/1167487-longfellow-investment-management-co-llc/) | $84.8K | 7,800 | 0.0% | 4 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $250 | 23 | 0.0% | 6 |
| [UBS Group AG](https://holderbook.com/funds/1610520-ubs-group-ag/) | $195 | 18 | 0.0% | 7 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 24 | $101.4M |
| Q1 2026 | 51 | $287.8M |
| Q4 2025 | 52 | $305.7M |
| Q3 2025 | 53 | $297.8M |
| Q2 2025 | 49 | $294.2M |
| Q1 2025 | 40 | $269.5M |
| Q4 2024 | 42 | $266.8M |
| Q3 2024 | 37 | $248.5M |