Suzano S.A.

ITEM 16.B. CODE OF ETHICS AND CONDUCT

Our board of directors adopted the “Code of Ethics and Conduct” document, which sets out the company’s ethical principles and values and applies to all our board members, directors, suppliers and employees, including our chief executive officer, our chief financial officer, our chief accounting officer and the other members of our finance department. No complaint, either express or implied, of provisions of our Code of Ethics and Conduct was granted to our chief executive officer, chief financial officer or chief accounting officer in 2024. A copy of our Code of Ethics and Conduct has been filed as Exhibit 11.1 to this annual report.

Our Code of Ethics and Conduct addresses, among others, the following topics:

•honest and ethical conduct, treating conflicts and misconduct with absolute secrecy;

•full, fair, accurate, timely, and understandable disclosure in reports and documents that we file with, or submit to public communications made by us;

•compliance with laws, internal procedures and rules and also rules established by Brazilian and international capital market regulatory agencies; and

•the prompt internal reporting of breaches related to our Code to the Ombudsman.

In order to keep the highest governance standards, every two years we review our Code of Ethics and Conduct to assure that the document is up-to-date and follows best practices and regulations. In 2025, we approved the last revision of our Code of Ethics and Conduct. All of our employees in management positions must reaffirm their commitment with our Code of Ethics and Conduct and to undertake to comply with its principles and guidelines while performing their professional activities by performing mandatory training

Additionally, we have conducted awareness actions in order to enforce the importance of business integrity, compliance and the governance instruments – our Code of Ethics and Conduct and the Ombudsman. Video-learning format regarding the anti-corruption policy and our Code of Ethics and Conduct have been given to employees, in order to reinforce the main guidelines and practices established by our Code of Ethics and Conduct. This training program is mandatory for our employees and at the end of the training each employee signs the training electronically.