5E Advanced Materials, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

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Filed by a Party other than the Registrant☐

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☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

5E ADVANCED MATERIALS, INC.

(Name of Registrant as Specified In Its Charter)

N/A

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

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☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To be held on December 7, 2026

NOTICE IS HEREBY GIVEN that the 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of 5E Advanced Materials, Inc., a Delaware corporation (the “Company”), will be held on December 7, 2026, at 10:00 a.m. Pacific time. To increase access for all of our stockholders, the Annual Meeting will be online and a completely virtual meeting of stockholders. You may attend, vote, and submit questions during the Annual Meeting via the live webcast on the Internet at meetnow.global/FEAM2026. You will not be able to attend the Annual Meeting in person, nor will there be any physical location.

Only stockholders of record at the close of business on October 14, 2026, are entitled to notice of, and to vote at, the Annual Meeting and any postponement or adjournment thereof. We are committed to ensuring our stockholders have the same rights and opportunities to participate in the Annual Meeting as if it had been held in a physical location. As further described in the proxy materials for the Annual Meeting, you may attend the Annual Meeting via the live webcast on the Internet at meetnow.global/FEAM2026. You may vote by telephone, Internet, or mail prior to the Annual Meeting. You will also be able to submit questions in advance of the Annual Meeting by logging in to meetnow.global/FEAM2026 using the 15-digit control number included on your proxy card or on the voting instruction form accompanying these proxy materials. While we encourage you to vote in advance of the Annual Meeting, you may also vote and submit questions relating to meeting matters during the Annual Meeting (subject to time restrictions).

To be admitted to the Annual Meeting at meetnow.global/FEAM2026, you must enter the control number found on your proxy card.

The Annual Meeting will be held for the following purposes:

to elect the five directors named in this Proxy Statement, being each of:

(1)

Graham van’t Hoff;

(2)

Curtis Hébert;

(3)

Barry Dick;

(4)

Bryn Jones; and

(5)

Jonathan Siegler

to serve until the 2027 annual meeting of stockholders (the “2027 Annual Meeting”) and until their respective successors are duly elected and qualified or until such director’s earlier death, resignation, disqualification or removal;

to ratify the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the 2027 fiscal year;

to approve an amendment to the Amended and Restated 5E Advanced Materials, Inc. 2022 Equity Compensation Plan to increase the number of shares of Common Stock authorized for issuance (“Proposal 3”);

to approve the adjournment of the Annual Meeting, if necessary, to solicit additional proxies if there are not sufficient votes in favor of Proposal Three; and

to consider and transact such other business as may properly come before the Annual Meeting.

This Notice of Annual Meeting and Proxy Statement is first being distributed or made available, as the case may be, on or about October 26, 2026. The Proxy Statement and our 2026 Annual Report are available at www.edocumentview.com/FEAM. The Notice of Internet Availability of Proxy Materials (“Notice”) provides instructions on how to vote online or by telephone and how to receive a paper copy of your proxy materials by mail.

Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to be Held on December 7, 2026. The Proxy Statement for the Annual Meeting and Annual Report for the fiscal year ended June 30, 2026 are available at www.edocumentview.com/FEAM. Your vote is very important. You may vote at the virtual meeting or by proxy. Whether or not you plan to virtually attend the Annual Meeting, we encourage you to review the proxy materials and submit your proxy or voting instructions as soon as possible. You may vote your proxy by telephone or Internet (instructions are on the Notice, your proxy card, and voter instruction form, as applicable) or by completing, signing, and mailing the enclosed proxy card in the enclosed envelope.

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