5E Advanced Materials, Inc.

ANNUAL MEETING OF STOCKHOLDERS

December 7, 2026

This Proxy Statement and 2026 Annual Report are being furnished to the stockholders of 5E Advanced Materials, Inc. (the “Company” or “5E Materials”) in connection with the solicitation of proxies for the Company’s 2026 Annual Meeting of Stockholders (the “Annual Meeting”) to be held on December 7, 2026, at 10:00 a.m. Pacific time, or at any adjournment or postponement thereof, for the purposes set forth herein. The Annual Meeting will be held via live webcast on the Internet at meetnow.global/FEAM2026. This solicitation is being made by the board of directors of the Company (the “Board of Directors” or the “Board”). You will be able to vote and submit questions online through the virtual-meeting platform during the Annual Meeting by visiting meetnow.global/FEAM2026 and entering your control number included in your Notice of Internet Availability of Proxy Materials, on your proxy card or on the instructions that accompanied your proxy materials.

This Proxy Statement is first being distributed or made available, as the case may be, on or about October 26, 2026.