Comparable stake leader
Riva Ridge Capital Management LP
SEC ownership of Ambipar Emergency Response
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001937441.
Disclosed value leader
Opportunity Private Equity Gestora de Recursos Ltda.
Comparable rows
4/5
Latest evidence
31 Mar 2026
- Public ticker
- AMBIQ on OTC
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Riva Ridge Capital Management LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
4 of 5
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Riva Ridge Capital Management LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001937441
- Issuer location
- Sao Paulo, Brazil
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 Ambipar Emergency Response (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
Riva Ridge Capital Manage...
Disclosed value leader
Opportunity Private Equit...
Comparable rows
4/5
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 7.1%
1 rows are not safely comparable across share classes.
13D/G row: Riva Ridge Capital Management LP
Quick read
Riva Ridge Capital Management LP leads the comparable SEC ownership view at 7.1%.
4 of 5 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 Riva Ridge Capital Management LP's linked filing trail.
Comparable ownership
Top 4
Riva Ridge Capital Management LP
7.1%
Opportunity Private Equity Gestor...
68%
Victor B. Almeida
68%
Turim 21 Investimentos Ltda.
0.74%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-5 of 5 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Riva Ridge Capital Management LP |
13D/G
|
7.1%
|
$1,557,128
1,235,816 shares
|
$0 | 29 Oct 2025 |
| Opportunity Private Equity Gestora de Recursos Ltda. |
3/4/5
Director
|
68%
|
$5,968,774
11,810,000 shares
|
— | 18 Mar 2026 |
| Victor B. Almeida |
3/4/5
Director
|
68%
|
$5,968,774
11,810,000 shares
|
— | 18 Mar 2026 |
| Turim 21 Investimentos Ltda. |
13F
Company
|
0.74%
|
$6,633
128,800 shares
|
— | 31 Mar 2026 |
| Sharp Capital Gestora de Recursos Ltda. |
13F
Company
|
—
class O/S missing
|
$215
1,075,000 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 02 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 1-9 of 9 reporting-owner rows connected to Ambipar Emergency Response. Open a relationship link for the CIK-to-CIK filing trail.
Rows
9
Largest Forms 3/4/5 holder
Opportunity Private Equity Gestora de Recursos Ltda.
Net 12M change
$0
Latest report
18 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Opportunity Private Equity Gestora de Recursos Ltda. | Director | $5,968,774 | Mixed | 18 Mar 2026 | ||
| Victor B. Almeida | Director | $5,968,774 | Mixed | 18 Mar 2026 | ||
| Thiago da Costa Silva | Director | Mixed | 17 Mar 2026 | |||
| Marco Antonio Zanini | Director | Mixed | 17 Mar 2026 | |||
| Tercio Borlenghi Junior | Director | Mixed | 17 Mar 2026 | |||
| Ricardo Cassio Rodrigues Chagas | CEO and CFO | Mixed | 17 Mar 2026 | |||
| David J. Mack | Director | Mixed | 18 Mar 2026 | |||
| Alessandra Bessa Alves de Melo | Director | Mixed | 17 Mar 2026 | |||
| Guilherme Patini Borlenghi | Director | Mixed | 17 Mar 2026 |
Recent insider transactions for Ambipar Emergency Response
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Victor B. Almeida | AMBI | Class A Ordinary Shares | 0 | 11,810,000 | 18 Mar 2026 | See Footnotes | ||||
| Opportunity Private Equity Gestora de Recursos Ltda. | AMBI | Class A Ordinary Shares | 0 | 11,810,000 | 18 Mar 2026 | See Footnotes |
* marks a reported price that did not pass the local price check.