Company: FEAV
Filing Date: 2025-05-23
Form Type: S-3
Source: 0001193125-25-125840
Chunk: 21

Company: 5E Advanced Materials, Inc.
Filing Date: 2025-05-23
Form: S-3
Chunk 21
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 |     |            |     | 9.1 | % |        |                   | 1,826,821 |     |            |                    | — |     | — |
| Lazarus Securities Pty Ltd (3) |        |                        |   194,930 |     |            |     |     | * |        |                   |   194,930 |     |            |                    | — |     | — |

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| * | Indicates beneficial ownership of less than 1% of the total outstanding common stock. |

| (1) | The percentage of beneficial ownership before this offering is calculated based on 20,017,746 shares of our 
 common stock outstanding as of May 14, 2025.                                                                |

| (2) | The business address of 5E Capital II, LLC is c/o Empire Capital Management, LLC, 6724 Perimeter Loop Road, S                                                                                                                                       
 145, Dublin, Ohio 43017. Empire Capital Management, LLC is the manager of 5E Capital II, LLC. David J. Richards, as the manager of Empire Capital Management, LLC, may be deemed to have beneficial ownership of the securities directly held by 5E 
 Capital II, LLC.                                                                                                                                                                                                                                    |

| (3) | The business address of Lazarus Securities Pty Ltd is 264 George Street, Level 18, Australia Square Tower, 
 Sydney, Australia 2000.                                                                                    |

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PLAN OF DISTRIBUTION We are registering the resale by the Selling Stockholders or their respective permitted transferees of the Shares. We will not receive any of the proceeds from the sale of the securities by the Selling Stockholders. The Selling Stockholders may offer and sell, from time to time, the Shares. The Selling Stockholders will act independently of us in making decisions with respect to the timing, manner and size of each sale. Such sales may be made on one or more exchanges or in the over-the-countermarket or otherwise, at prices and under terms then prevailing or at prices related to the then current market price or in negotiated transactions. The Selling Stockholders may sell their securities by one or more of, or a combination of, the following methods:

| • |     | on Nasdaq, in the                                                                                                  
 over-the-counter market or on any other national securities exchange on which our securities are listed or traded; |

| • |     | purchases by a broker-dealer as principal and resale by such broker-dealer for their own account pursuant to this