Company: TMCWW
Filing Date: 2025-06-18
Form Type: 424B3
Source: 0001104659-25-060346
Chunk: 0

Company: TMC the metals Co Inc.
Filing Date: 2025-06-18
Form: 424B3
Chunk 0
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Filed pursuant to Rule 424(b)(3)

Registration No. 333-275822

PROSPECTUS SUPPLEMENT

To Prospectus Supplement dated November 14, 2024,

as amended by Amendment No. 1 thereto dated November 26, 2024

(To Prospectus dated December 8, 2023)

<div align='center'>TMC THE METALS COMPANY INC.

Up to 19,900,000 Common Shares

Class B Warrants to Purchase up to 9,950,000 Common Shares</div>

This prospectus supplement
supplements the prospectus supplement dated November 14, 2024, as amended by amendment no. 1 thereto dated November 26, 2024 (collectively,
the “original prospectus supplement”), related to our offering of 19,900,000 of our common shares and accompanying Class B
warrants to purchase 9,950,000 of our common shares at an exercise price of $2.00 per share (and the common shares issuable from time
to time upon exercise of these Class B warrants).

This prospectus supplement
is being filed to reflect our waiver of the limitation set forth in the Class B warrants with respect to the cashless exercise thereof
so that the holder may exercise a Class B warrant through a cashless exercise, at any time after the date of this prospectus supplememnt,
whether or not a registration statement registering the issuance of the common shares underlying the Class B warrants under the Securities
Act of 1933, as amended, is then effective or available. As a result of the waiver, each Class B warrant may now be immediately exercised
by way of a cashless exercise, meaning that the holder may elect to not pay a cash purchase price upon exercise and instead receive upon
such exercise the net number of common shares determined according to the formula set forth in the Class B warrant, subject to the other
terms and conditions of the Class B warrants. Accordingly, we will only receive additional proceeds from the exercise of the Class B warrants
if the Class B warrants are not cashless exercised and the holders of the Class B warrants pay the exercise price in cash upon such exercise
and do not utilize the cashless exercise provision of the Class B warrants. As of the date of this prospectus supplement, Class B warrants
to purchase an aggregate of 8,650,000 common shares remain outstanding and not exercised.

You should read this prospectus
supplement in conjunction with