CFO change at Ambipar Emergency Response (NYSE American: AMBI)

Rhea-AI Filing Summary

Ambipar Emergency Response reported a leadership change in its finance team. Pedro Petersen has stepped down as Chief Financial Officer of Ambipar Emergency Response effective September 24, 2025, and will transition to other roles within the broader Ambipar Group. The company states that board member Ricardo Chagas will temporarily assume the CFO responsibilities while the Board searches for a permanent replacement.

Ambipar Emergency Response provides environmental and emergency services across six business units and operates in 41 countries on six continents, offering standardized services globally.

Insights

Corporate governance analyst

CFO transition announced with interim coverage by existing leader.

The company states that CFO Pedro Petersen resigned from his role effective September 24, 2025, and will move to other positions within the Ambipar Group. Leadership changes in the finance function can matter because the CFO oversees reporting, capital structure, and risk management.

Ambipar Emergency Response indicates continuity by having Ricardo Chagas “accumulate the role” of CFO while the Board searches for a replacement. Since Petersen remains within the group and no issues or performance concerns are mentioned, this looks like an orderly transition rather than a crisis-driven exit based on the information provided.

Future company communications may clarify the profile of the eventual permanent CFO and any strategic shifts in financial priorities that accompany that appointment, but no such changes are described here.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September, 2025

Commission File Number: 001-41638

AMBIPAR EMERGENCY RESPONSE

(Exact name of registrant as specified in its charter)

Avenida Angélica, nº 2346, 5th Floor

São Paulo, São Paulo, Brazil, 01228-200

Tel: +55 (11) 3526-3526

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F  ☒             Form 40-F  ☐

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Ambipar Emergency Response Announces Leadership Changes

São Paulo, Brazil – September 24, 2025 – Ambipar Emergency Response (NYSE American: AMBI) (“Ambipar Response” or the “Company”) announces the following leadership changes:

Pedro Petersen has stepped down from his position as CFO of Ambipar Response effective September 24, 2025 and will transition to other roles within the Ambipar Group. Mr. Ricardo Chagas, will accumulate the role while the Company’s Board seeks for a replacement.

About Ambipar Emergency Response

Ambipar Response specializes in environmental services, and operates in six main business units: emergency response, fire response, marine response, medical response, industrial response and environmental response. The Company is present in 41 countries across all six continents, providing standardized services across all regions.

The Company was founded in 1995 by Tércio Borlenghi Jr.

For more information, visit ambipar.com and http://ir-response.ambipar.com/

Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are made only as of the date they first issued and are based on current expectations, estimates, forecasts and projections as well as the beliefs and assumptions of management. These statements identify prospective information and may include words such as “believe,” “may,” “will,” “aim,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “forecast,” “plan,” “predict,” “project,” “potential,” “aspiration,” “objectives,” “should,” “purpose,” “belief,” and similar, or variations of, or the negative of such words and expressions, although not all forward-looking statements contain these identifying words.

Forward-looking statements are subject to a number of risks and uncertainties, many of which involve factors or circumstances that are beyond Ambipar Response’s control.

Ambipar Response’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors, including but not limited to: more intense competition than expected, lower addition of new clients, regulatory measures, more investments in our business than expected, and our inability to execute successfully upon our strategic initiatives, among other factors described in "Item 3.D—Key Information--Risk Factors" of Ambipar Response's annual report on Form 20-F for the year ended December 31, 2024 and other public filings it makes with the Securities and Exchange Commission. Ambipar Response does not undertake any obligation to update or revise any forward-looking statements to reflect any change in its expectations with respect to such statements or any changes in events, conditions or circumstances after the date they were made, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Investor Relations Contact:

Email: ir.response@ambipar.com

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: September 24, 2025

	AMBIPAR EMERGENCY RESPONSE
	By:	/s/Thiago da Costa Silva
	Name:	Thiago da Costa Silva
	Title:	Director

FAQ

What leadership change did Ambipar Emergency Response (AMBI) announce?

Ambipar Emergency Response announced that Pedro Petersen has stepped down from his position as CFO effective September 24, 2025, and will transition to other roles within the Ambipar Group.

Who will serve as CFO of Ambipar Emergency Response (AMBI) after Pedro Petersen steps down?

The company states that Mr. Ricardo Chagas will accumulate the role of CFO while the Board of Ambipar Emergency Response searches for a replacement.

Is Pedro Petersen leaving the Ambipar Group entirely?

No. The filing explains that Pedro Petersen will transition to other roles within the Ambipar Group after stepping down as CFO of Ambipar Emergency Response.

What type of services does Ambipar Emergency Response (AMBI) provide?

Ambipar Emergency Response provides environmental services across six business units: emergency response, fire response, marine response, medical response, industrial response and environmental response.

In how many countries does Ambipar Emergency Response (AMBI) operate?

The company reports that it is present in 41 countries across all six continents, offering standardized services across all regions.

Where is Ambipar Emergency Response headquartered?

Ambipar Emergency Response lists its principal executive office at Avenida Angélica, nº 2346, 5th Floor, São Paulo, São Paulo, Brazil, 01228-200.

Where can investors find more information about Ambipar Emergency Response (AMBI)?

Investors are directed to visit ambipar.com and http://ir-response.ambipar.com/, or contact Investor Relations at ir.response@ambipar.com.