GPAT GP-Act III Acquisition Corp. - Class A Ordinary Share
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Institutional owners (13F) 27 filers · $102.6M total · As of June 30, 2026
Institutions that report holding this stock in their quarterly SEC Form 13F. Long positions only; a single filer may appear twice for separate option legs. Large offsetting put/call legs typically reflect market-making or hedged inventory, not directional conviction.
| New positions | Exited positions | Increased | Decreased | Net shares change |
|---|---|---|---|---|
| 3 (-1 vs prior Q) | 29 (+24 vs prior Q) | 5 (-2 vs prior Q) | 12 (-5 vs prior Q) | -17.2M |
Compared to Q1 2026. SEC Form 13F filings are due within 45 days of quarter-end plus a short buffer for late filers — quarters still inside that window are skipped in favor of the most recent fully-reported pair.
| Institution | Value | Shares | % of tracked 13F | Type |
|---|---|---|---|---|
| Polar Asset Management Partners Inc. | $19,566,000 | 1,800,000 | 19.07% | Shares |
| AQR Arbitrage LLC | $15,246,000 | 1,400,000 | 14.86% | Shares |
| MMCAP International Inc. SPC | $13,859,250 | 1,275,000 | 13.51% | Shares |
| Alberta Investment Management Corp | $10,890,000 | 1,000,000 | 10.62% | Shares |
| Schechter Investment Advisors, LLC | $9,192,047 | 893,299 | 8.96% | Shares |
| MIZUHO SECURITIES USA LLC | $6,031,649 | 558,486 | 5.88% | Shares |
| BERKLEY W R CORP | $5,413,027 | 497,064 | 5.28% | Shares |
| Verition Fund Management LLC | $4,343,858 | 398,885 | 4.23% | Shares |
| HGC Investment Management Inc. | $4,341,337 | 399,387 | 4.23% | Shares |
| TORONTO DOMINION BANK | $3,752,117 | 345,181 | 3.66% | Shares |
| PICTON MAHONEY ASSET MANAGEMENT | $2,722,501 | 250,000 | 2.65% | Shares |
| Periscope Capital Inc. | $1,657,500 | 150,000 | 1.62% | Shares |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $1,632,955 | 149,950 | 1.59% | Shares |
| JPMORGAN CHASE & CO | $1,085,478 | 99,860 | 1.06% | Shares |
| Lineage Point Capital LP | $715,985 | 64,795 | 0.70% | Shares |
| MOORE CAPITAL MANAGEMENT, LP | $543,500 | 50,000 | 0.53% | Shares |
| DEUTSCHE BANK AG\ | $542,500 | 50,000 | 0.53% | Shares |
| MIZUHO SECURITIES USA LLC | $303,000 | 30,000 | 0.30% | Shares |
| GEODE CAPITAL MANAGEMENT, LLC | $232,632 | 21,362 | 0.23% | Shares |
| CITADEL ADVISORS LLC | $218,225 | 20,039 | 0.21% | Shares |
| CLEAR STREET LLC | $108,887 | 10,321 | 0.11% | Shares |
| Clear Street Group Inc. | $99,950 | 9,195 | 0.10% | Shares |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC | $84,786 | 7,800 | 0.08% | Shares |
| Kepos Capital LP | $470 | 42,500 | 0.00% | Shares |
| MORGAN STANLEY | $250 | 23 | 0.00% | Shares |
| UBS Group AG | $195 | 18 | 0.00% | Shares |
| HRT FINANCIAL LP | $162 | 14,965 | 0.00% | Shares |