Company: FEAV
Filing Date: 2025-08-25
Form Type: 424B5
Source: 0001888654-25-000019
Chunk: 18

Company: 5E Advanced Materials, Inc.
Filing Date: 2025-08-25
Form: 424B5
Chunk 18
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 that they are made, you should not rely on them. We undertake no obligation to revise or update publicly any forward-looking statements for any reason, whether as a result of new information, future events or otherwise, except as may be required by law.

<div align='center'>S-9

USE OF PROCEEDS</div>

We estimate that the net proceeds from this offering, after deducting estimated underwriting discounts and commissions and offering expenses, payable by us, will be approximately $7.3 million.

We currently intend to use the net proceeds from this offering, together with our existing cash, cash equivalents and marketable securities, primarily for the operation of our SSF, wellfield development and analysis, advanced planning for FEL-3 engineering, general corporate purposes, including, without limitation, working capital, advances to or investments in our subsidiaries and general and administrative matters.

The amounts and timing of our actual expenditures will depend on numerous factors, including the factors described under “Risk Factors” in this prospectus supplement, the accompanying prospectus and in the documents incorporated by reference herein and therein, as well as the amount of cash used in our operations. We may find it necessary or advisable to use the net proceeds for other purposes, and our management will have broad discretion in the application of the net proceeds to us from this offering, including for any of the purposes described above. Pending the use of the net proceeds from this offering, we intend to invest the net proceeds in interest-bearing, investment-grade securities, certificates of deposit or government securities.

<div align='center'>S-10</div>

U NDERWRITING We have entered into an underwriting agreement dated August 21, 2025 with Konik Capital Partners, LLC, a division of T.R. Winston & Co., as the representative of the underwriters in this offering. Subject to the terms and conditions of the underwriting agreement, the underwriters have agreed to purchase the number of our shares of common stock set forth opposite its name below.

| Underwriters                                                  |     | Number of Shares of Common Stock |           |
| Konik Capital Partners, LLC, a division of T.R. Winston & Co. |     |                                  | 2,374,481 |
| Total                                                         |     |                                  | 2,374,481 |

A copy of the underwriting agreement will be filed as an exhibit to a Current Report on Form 8-K and incorporated by reference into the registration statement of which this prospectus supplement is part. We have been advised by