Core Natural Resources, Inc.

The information required by this Item is incorporated by reference from the information under the captions “Proposal No. 1 - Election of Directors,” “Executive Officers,” “Beneficial Ownership of Securities” and “Board of Directors and Compensation Information - Board of Directors and its Committees” in the Company’s Proxy Statement on Schedule 14A for its 2026 Annual Meeting of Stockholders (the “Proxy Statement”).

Code of Ethics

The Company has a written Code of Business Conduct and Ethics that applies to the Company’s Chair and Chief Executive Officer (Principal Executive Officer), President and Chief Financial Officer (Principal Financial Officer), Chief Accounting Officer (Principal Accounting Officer) and others. The Code of Business Conduct and Ethics is available on the Company’s website at www.corenaturalresources.com. Any amendments to, or waivers from, a provision of our Code of Business Conduct and Ethics that applies to our Principal Executive Officer, Principal Financial Officer and Principal Accounting Officer and that relates to any element of the code of ethics enumerated in paragraph (b) of Item 406 of Regulation S-K shall be disclosed by posting such information on our website at www.corenaturalresources.com.

Insider Trading Policies and Procedures

The Company hasadopted an Insider Trading Compliance Policy governing the purchase, sale or other disposition of our securities by the Company’s directors, officers and employees, entities controlled by the Company’s directors, officers and employees, and contractors, consultants and other persons designated by the Company, which we believe is reasonably designed to promote compliance with insider trading laws, rules and regulations and applicable listing standards. A copy of our Insider Trading Compliance Policy was filed as Exhibit 19 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on February 20, 2025.