GP-ACT III ACQUISITION CORP GPAT
CL A · Common Stock · CUSIP G4035N103
- SectorBlank check (SPAC)
- IndustryBlank Checks
- HeadquartersNew York, NY
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $10.88.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2024 | 38 |
| Q4 2024 | 43 |
| Q1 2025 | 41 |
| Q2 2025 | 49 |
| Q3 2025 | 52 |
| Q4 2025 | 52 |
| Q1 2026 | 52 |
| Q2 2026 | 24 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2024 | 11 | 15 |
| Q1 2025 | 7 | 13 |
| Q2 2025 | 21 | 12 |
| Q3 2025 | 15 | 14 |
| Q4 2025 | 10 | 15 |
| Q1 2026 | 11 | 22 |
| Q2 2026 | 8 | 41 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $39.0k | $0 | 0.00 |
| Q4 2025 | $0 | $0 | — |
| Q1 2026 | $0 | $0 | — |
| Q2 2026 | $0 | $0 | — |
Biggest buyers
| Polar Asset Management Partners Inc. | Added | +625.0k |
| MIZUHO SECURITIES USA LLC | Added | +558.5k |
| HGC Investment Management Inc. | Added | +399.4k |
| Verition Fund Management LLC | Added | +171.3k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | New | +149.9k |
| HRT FINANCIAL LP | New | +15.0k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +10.0k |
| CITADEL ADVISORS LLC | Added | +2.9k |
Biggest sellers
| Karpus Management, Inc. | Sold out | -2.2m |
| First Trust Capital Management L.P. | Sold out | -2.1m |
| D. E. Shaw & Co., Inc. | Sold out | -1.4m |
| LMR Partners LLP | Sold out | -1.2m |
| PICTON MAHONEY ASSET MANAGEMENT | Reduced | -1.1m |
| Wealthspring Capital LLC | Sold out | -1.0m |
| Westchester Capital Management, LLC | Sold out | -860.9k |
| Linden Advisors LP | Sold out | -797.6k |
| TENOR CAPITAL MANAGEMENT Co., L.P. | Sold out | -750.0k |
| WOLVERINE ASSET MANAGEMENT LLC | Sold out | -745.4k |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| GP-Act III Sponsor LLC 13G · exempt (held before listing) new · filed 2025-03-07 | 19.8% |
| Polar Asset Management Partners Inc. 13G · institution +7.0 pts · filed 2026-06-04 | 11.1% |
| AQR CAPITAL MANAGEMENT LLC 13G · institution filed 2026-08-14 | 8.7% |
| HGC Investment Management Inc. 13G · institution new · filed 2025-02-14 | 8.6% |
| METEORA CAPITAL, LLC 13G · institution new · filed 2025-08-14 | 6.7% |
| BARCLAYS PLC 13G · institution no change · filed 2025-03-28 | 5.2% |
Fell to 5% or below in the last year: First Trust Capital Management L.P. (0.0%, 2026-08-14), Karpus Management, Inc. (0.0%, 2026-06-05), PICTON MAHONEY ASSET MANAGEMENT (4.8%, 2026-04-27), BANK OF MONTREAL /CAN/ (0.0%, 2026-02-12)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Polar Asset Management Partners Inc. 0.36% of their portfolio | 1.8m $19.6m | Added +625.0k |
| AQR Arbitrage LLC 0.22% of their portfolio | 1.4m $15.2m | Reduced -176.8k |
| MMCAP International Inc. SPC 1.17% of their portfolio | 1.3m $13.9m | Unchanged |
| Alberta Investment Management Corp 0.06% of their portfolio | 1.0m $10.9m | Reduced -625.0k |
| MIZUHO SECURITIES USA LLC 0.06% of their portfolio | 618.6k $6.7m | Added +558.5k |
| BERKLEY W R CORP 0.27% of their portfolio | 497.1k $5.4m | Reduced -349.8k |
| HGC Investment Management Inc. 0.86% of their portfolio | 399.4k $4.3m | Added +399.4k |
| Verition Fund Management LLC 0.03% of their portfolio | 398.9k $4.3m | Added +171.3k |
| TORONTO DOMINION BANK 0.01% of their portfolio | 345.2k $3.8m | Reduced -290.3k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 290.0k $3.1m | Unchanged |
| PICTON MAHONEY ASSET MANAGEMENT 0.03% of their portfolio | 250.0k $2.7m | Reduced -1.1m |
| Periscope Capital Inc. 0.26% of their portfolio | 150.0k $1.7m | Reduced -100.0k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.00% of their portfolio | 149.9k $1.6m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 99.9k $1.1m | Reduced -450.0k |
| Lineage Point Capital LP 0.15% of their portfolio | 64.8k $716.0k | Reduced -205 |
| MOORE CAPITAL MANAGEMENT, LP 0.01% of their portfolio | 50.0k $543.5k | Reduced -150.0k |
| Kepos Capital LP 0.64% of their portfolio | 42.5k $470.0k | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 21.4k $232.6k | Added +10.0k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 20.0k $218.2k | Added +2.9k |
| HRT FINANCIAL LP 0.00% of their portfolio | 15.0k $162.0k | New |
| Clear Street Group Inc. 0.00% of their portfolio | 9.2k $100.0k | Reduced -1.1k |
| LONGFELLOW INVESTMENT MANAGEMENT CO LLC 0.02% of their portfolio | 7.8k $84.8k | Unchanged |
| MORGAN STANLEY 0.00% of their portfolio | 23 $250 | Reduced -41 |
| UBS Group AG 0.00% of their portfolio | 18 $195 | Reduced -168 |