34 institutions reported holding $1.8M of GP-ACT III ACQUISITION CORP (GPATW) in SEC 13F filings for 2026-03-31. Largest institutional holders: Harraden Circle Investments, LLC ($213,207), Polar Asset Management Partners Inc. ($173,498), MMCAP International Inc. SPC ($145,458), HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND ($131,438), PICTON MAHONEY ASSET MANAGEMENT ($131,438). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Harraden Circle Investments, LLC | $213,207 | 1.5M | Trimmed |
| 2 | Polar Asset Management Partners Inc. | $173,498 | 1.2M | Hold |
| 3 | MMCAP International Inc. SPC | $145,458 | 1.0M | Hold |
| 4 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $131,438 | 937,500 | Hold |
| 5 | PICTON MAHONEY ASSET MANAGEMENT | $131,438 | 937,500 | Hold |
| 6 | Alberta Investment Management Corp | $113,913 | 812,500 | Hold |
| 7 | Wealthspring Capital LLC | $107,108 | 763,964 | Trimmed |
| 8 | LMR Partners LLP | $85,873 | 612,500 | Hold |
| 9 | Lineage Point Capital LP | $71,107 | 507,184 | Added |
| 10 | Shaolin Capital Management LLC | $70,009 | 499,349 | Trimmed |
| 11 | TORONTO DOMINION BANK | $66,730 | 476,642 | Added |
| 12 | AQR Arbitrage LLC | $64,156 | 457,602 | Trimmed |
| 13 | CSS LLC/IL | $61,922 | 441,672 | Trimmed |
| 14 | Linden Advisors LP | $57,700 | 360,400 | Hold |
| 15 | ARISTEIA CAPITAL, L.L.C. | $39,285 | 245,375 | Hold |
| 16 | METEORA CAPITAL, LLC | $33,394 | 238,185 | Trimmed |
| 17 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $31,629 | 225,599 | Hold |
| 18 | Verition Fund Management LLC | $31,601 | 225,400 | Trimmed |
| 19 | Saba Capital Management, L.P. | $30,936 | 193,229 | Hold |
| 20 | GRITSTONE ASSET MANAGEMENT LLC | $30,458 | 217,248 | Hold |
| 21 | Periscope Capital Inc. | $29,540 | 210,700 | Hold |
| 22 | Clear Street Group Inc. | $27,871 | 198,794 | Trimmed |
| 23 | Lepercq De Neuflize Asset Management LLC | $21,030 | 150,000 | New |
| 24 | K2 PRINCIPAL FUND, L.P. | $17,052 | 121,798 | Hold |
| 25 | MOORE CAPITAL MANAGEMENT, LP | $14,020 | 100,000 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31