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Exhibit 21
ARCADIUM LITHIUM PLC
SIGNIFICANT SUBSIDIARIES OF THE REGISTRANT
The following is a list of the Company’s consolidating subsidiaries, as of December 31, 2024, except for certain subsidiaries of the Registrant which do not, in the aggregate, constitute a significant subsidiary as that term is defined in Rule 12b-2 under the Securities Exchange Act of 1934. This list does not include equity affiliate investments and cost investments.
| | | | | | | | |
| Name of Subsidiary | | State or Country of Incorporation |
| Arcadium Lithium plc (the Registrant) | | Bailiwick of Jersey |
| Galaxy Lithium (Canada) Inc. | | Canada |
| Galaxy Lithium (SAL DE VIDA) S.A. | | Argentina |
| Livent Lithium LLC | | Delaware |
| Livent Lithium (Zhangjiagang) Co. Ltd. | | China |
| Minera del Altiplano S.A. | | Argentina |
| Nemaska Lithium Inc. | | Canada |
| Sales de Juluy S.A. | | Argentina |