Company: TMCWW
Filing Date: 2025-06-18
Form Type: 424B3
Source: 0001104659-25-060346
Chunk: 1

Company: TMC the metals Co Inc.
Filing Date: 2025-06-18
Form: 424B3
Chunk 1
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 the original prospectus supplement and the accompanying prospectus. This prospectus supplement is qualified
by reference to the original prospectus supplement and the accompanying prospectus except to the extent that the information in this prospectus
supplement supersedes the information contained in the original prospectus supplement. This prosectus supplement is not complete without,
and may not be delivered or utilized except in connection with, the original prospectus supplement and the accompanying prospectus.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-9 of the original prospectus supplement, as supplemented by the information above, and under similar headings in the documents incorporated by reference into the original prospectus supplement and the accompanying prospectus for a discussion of certain risks you should consider before investing in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement, the original prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The securities offered by this prospectus supplement and the original prospectus supplement have not been qualified for distribution in Canada and may not be offered or sold in Canada.

<div align='center'>The date of this prospectus supplement is June
17, 2025.</div>