Company: FEAV
Filing Date: 2025-08-19
Form Type: 424B3
Source: 0001888654-25-000012
Chunk: 1

Company: 5E Advanced Materials, Inc.
Filing Date: 2025-08-19
Form: 424B3
Chunk 1
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 to the ATM Program.

Investing in our common stock involves a high degree of risk. You should read carefully and consider the risks referenced under “Risk Factors” beginning on pageS-5 of the ATM Prospectus Supplement and the prospectus contained in the Form S-3, any related free writing prospectus and other information contained or incorporated by reference in this Supplement No. 1 and the accompanying prospectus, before making a decision to invest in our securities.

The purpose of this Supplement No. 1 is to terminate our continuous offering under the ATM Prospectus Supplement and the Equity Distribution Agreement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of this Supplement No. 1, the ATM Prospectus Supplement and the prospectus contained in the Form S-3. Any representation to the contrary is a criminal offense.

<div align='center'>August 19, 2025</div>