Ambipar Emergency Response
AMBIQ- Industry
- Hazardous Waste Management
- SEC CIK
- 0001937441
No open-market purchases or sales by Ambipar Emergency Response insiders were filed in the last 90 days; no institution reported holding it in 13F filings for Q2 2026; no superinvestor holds it.
Holders of 5% or more of AMBIQ
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Ambipar Emergency Response, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Riva Ridge Capital Management LP | 13G | 7.10%1.24M shares | New | Nov 5, 20251 filing | Nov 5, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Ambipar Emergency Response, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 5, 20257:19 PM ET | Riva Ridge Capital Management LPand 4 others | 13G | 7.10%1.24M shares | New | Oct 29, 2025 | SEC |
| Feb 14, 2024 | Ambipar Participacions & Enterprises S.A. | 13GOld format | – | New | – | SEC |
| Jan 30, 2024 | Opportunity Private Equity Gestora de Recursos Ltda. | 13GOld format | – | New | – | SEC |
| Dec 7, 2023 | SPX Equities Gestao de Recursos Ltda | 13G/AOld format | – | – | – | SEC |
| Jun 6, 2023 | SPX Equities Gestao de Recursos Ltda | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Ambipar Emergency Response shares.
No Form 144 notices for Ambipar Emergency Response are on file.