Comparable stake leader
GP-Act III Sponsor LLC
SEC ownership of GP-Act III Acquisition Corp.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001834526.
Disclosed value leader
GP-Act III Sponsor LLC
Comparable rows
8/46
Latest evidence
30 Jun 2026
- Public ticker
- GPAT, GPATU, GPATW on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
GP-Act III Sponsor LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
8 of 46
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
GP-Act III Sponsor LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001834526
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of GP-Act III Acquisition Corp. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
GP-Act III Sponsor LLC
Disclosed value leader
GP-Act III Sponsor LLC
Comparable rows
8/46
Latest evidence
30 Jun 2026
13D/G
13F
Lead comparable stake: 20%
38 rows are not safely comparable across share classes.
13D/G row: GP-Act III Sponsor LLC
Showing 1-8 of 46 holder rows.
Quick read
GP-Act III Sponsor LLC leads the comparable SEC ownership view at 20%.
8 of 46 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens GP-Act III Sponsor LLC's linked filing trail.
Comparable ownership
Top 5
GP-Act III Sponsor LLC
20%
Polar Asset Management Partners Inc.
11%
AQR CAPITAL MANAGEMENT LLC
8.7%
HGC Investment Management Inc.
8.6%
METEORA CAPITAL, LLC
6.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 46 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| GP-Act III Sponsor LLC |
13D/G
|
20%
Reported 13D/G
· 14 Nov 2024
|
$73,543,250
7,112,500 shares
|
$0 | 14 Nov 2024 |
| Polar Asset Management Partners Inc. |
13F
13D/G
Company
|
11%
Reported 13D/G
· 31 May 2026
|
$19,801,125
3,037,500 shares
mixed-class rows
|
— | 30 Jun 2026 |
| AQR CAPITAL MANAGEMENT LLC |
13D/G
|
8.7%
Reported 13D/G
· 30 Jun 2026
|
$15,204,000
1,400,000 shares
|
$0 | 30 Jun 2026 |
| HGC Investment Management Inc. |
13D/G
13F
Company
|
8.6%
Reported 13D/G
· 31 Dec 2024
|
$25,591,500
2,475,000 shares
|
$0 | 31 Dec 2024 |
| METEORA CAPITAL, LLC |
13D/G
13F
Company
|
6.7%
Reported 13D/G
· 30 Jun 2025
|
$20,329,839
1,926,999 shares
|
$0 | 30 Jun 2025 |
| PICTON MAHONEY ASSET MANAGEMENT |
13D/G
13F
Company
|
6.5%
Reported 13D/G
· 30 Sep 2024
|
$19,387,500
1,875,000 shares
|
$0 | 30 Sep 2024 |
| BARCLAYS PLC |
13D/G
|
5.2%
Reported 13D/G
· 30 Sep 2024
|
$15,365,126
1,485,989 shares
|
$0 | 30 Sep 2024 |
| MMCAP International Inc. SPC |
13F
13D/G
Company
|
4.4%
Reported 13D/G
· 30 Jun 2025
|
$14,056,375
2,312,500 shares
mixed-class rows
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
No eligible buy or sell activity is available for this window. No eligible Buy or Sell transactions are available in this dataset since 07 Nov 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-6 of 6 reporting-owner rows connected to GP-Act III Acquisition Corp.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
6
Largest Forms 3/4/5 holder
Sergio Pedreiro
Net 12M change
$0
Latest report
08 May 2024
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Sergio Pedreiro | Director | Mixed | 08 May 2024 | |||
| Steven L. Spinner | Director | Mixed | 08 May 2024 | |||
| Alexandre Ruberti | Director | Mixed | 08 May 2024 | |||
| Andrew Fleiss | Director | Mixed | 08 May 2024 | |||
| Rodrigo Boscolo | Chief Financial Officer | Mixed | 08 May 2024 | |||
| GP-Act III Sponsor LLC | Director, 10%+ Owner | Mixed | 08 May 2024 |
Recent insider transactions for GP-Act III Acquisition Corp.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.