EXHIBIT 21.1
ASP Isotopes Inc.
Subsidiaries of the Registrant
| Subsidiaries* | Place of Incorporation | |
| ASP Isotopes Guernsey Limited (formerly, PDS-Photonica Holdings (Guernsey) Limited) | Guernsey | |
| ASP Isotopes South Africa (Proprietary) Limited (formerly, PDS Photonica Holdings South Africa (PTY) Limited) | South Africa | |
| Enriched Energy LLC | Delaware, U.S. | |
| ASP Isotopes UK Ltd | England & Wales | |
| Enlightened Isotopes (Pty) Ltd | South Africa | |
| ASP Isotopes EHF | Iceland | |
| Quantum Leap Energy LLC | Delaware, U.S. | |
| Quantum Leap Energy Limited | England & Wales | |
| Quantum Leap Energy (Pty) Ltd | South Africa | |
| PET Labs Pharmaceuticals (Pty) Ltd | South Africa |
|
| * | Please note that this list includes all subsidiaries of ASP Isotopes Inc. without regard to whether they would constitute a "significant subsidiary" pursuant to Item 601(b)(21)(ii) of Regulation S-K. |