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
37/50
Latest evidence
31 May 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
-
37 of 50
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
-
31 May 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
37/50
Latest evidence
31 May 2026
13D/G
13F
Lead comparable stake: 20%
13 rows are not safely comparable across share classes.
13D/G row: GP-Act III Sponsor LLC
Showing 1-8 of 50 holder rows.
Quick read
GP-Act III Sponsor LLC leads the comparable SEC ownership view at 20%.
37 of 50 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%
HGC Investment Management Inc.
8.6%
METEORA CAPITAL, LLC
6.7%
PICTON MAHONEY ASSET MANAGEMENT
6.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| GP-Act III Sponsor LLC |
13D/G
|
20%
|
$73,543,250
7,112,500 shares
|
$0 | 14 Nov 2024 |
| Polar Asset Management Partners Inc. |
13D/G
13F
Company
|
11%
|
$19,512,000
1,800,000 shares
|
+$6,775,043 | 31 May 2026 |
| HGC Investment Management Inc. |
13D/G
|
8.6%
|
$25,591,500
2,475,000 shares
|
$0 | 31 Dec 2024 |
| METEORA CAPITAL, LLC |
13D/G
13F
Company
|
6.7%
|
$20,329,839
1,926,999 shares
|
$0 | 30 Jun 2025 |
| PICTON MAHONEY ASSET MANAGEMENT |
13D/G
13F
Company
|
6.5%
|
$19,387,500
1,875,000 shares
|
$0 | 30 Sep 2024 |
| BARCLAYS PLC |
13D/G
|
5.2%
|
$15,365,126
1,485,989 shares
|
$0 | 30 Sep 2024 |
| MMCAP International Inc. SPC |
13F
13D/G
Company
|
4.4%
from 13D/G
|
$13,966,458
2,312,500 shares
mixed-class rows
|
— | 31 Mar 2026 |
| Karpus Management, Inc. |
13F
Company
|
14%
|
$24,175,541
2,230,216 shares
|
— | 31 Mar 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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 05 Aug 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.