Ambipar Emergency Response-A 2025年年度报告和过渡报告

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes☐No☒ If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or15(d) of the Securities Exchange Act of 1934. Yes☐No☒ Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Actof 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and(2) has been subject tosuch filing requirements for the past 90 days. Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submitsuch files). Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growthcompany. See definition of “large accelerated filer”, “accelerated filer”, and “emerging growth company” in Rule 12b-2 of the Exchange Act. If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registranthas elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant toSection 13(a) of the Exchange Act.☐ †The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification afterApril 5, 2012. Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of itsinternal control over financial reporting over Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firmthat prepared or issued its audit report.☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrantincluded in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing: If “Other” has been checked in response to the previous question indicate by check mark which financial statement item the registrant haselected to follow. Item 17☐Item 18☐ If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the ExchangeAct).Yes☐No☒ (APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS) Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of theSecurities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court. Yes☐No☐ TABLE OF CONTENTS Item3. KEY INFORMATION13Item4. INFORMATION ON THE COMPANY61Item 4.A. UNRESOLVED STAFF COMMENTS84Item5. OPERATING AND FINANCIAL REVIEW AND PROSPECTS85Item6. DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES105Item7. MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS112Item8. FINANCIAL INFORMATION122Item9. THE OFFER AND LISTING123Item10. ADDITIONAL INFORMATION123Item11. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK141Item12. DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES142PART II143Item13. DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES143Item14. MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OFPROCEEDS143Item15. CONTROLS AND PROCEDURES143Item16. [RESERVED]147Item 16A. AUDIT COMMITTEE FINANCIAL EXPERT147Item 16B. CODE OF ETHICS147Item16C. PRINCIPAL ACCOUNTANT FEES AND SERVICES148Item16D. EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES148Item 16E. PURCHASES OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS148Item16F. CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT148Item16G. CORPORATE GOVERNANCE148Item16H. MINE SAFETY DISCLOSURE149Item16I. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS149Item16J. INSIDER TRADING POLICY149Item16K. CYBERSECURITY149PART III150Item17. FINANCIAL STATEMENTS150Item18. FINANCIAL STATEMENTS150 Cautionary NoteRegarding Forward-Looking Statements This annual report on Form20-F, or annual report, contains or may contain forward-looking statements as defined inSection27A of the Securities Act of 1933, as amended (th