UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 001-39281

TMC THE METALS COMPANY INC.

(Exact name of registrant as specified in its charter)

Securities registered pursuant to Section 12(g) of the Exchange Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ¨ No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes ¨ No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes x No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ¨

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ¨

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x

The aggregate market value of the registrant’s voting and non-voting common stock held by non-affiliates of the registrant (without admitting that any person whose shares are not included in such calculation is an affiliate) computed by reference to the price at which the common shares were last sold as of the last business day of the registrant’s most recently completed second fiscal quarter was $274,979,313.

As of March 22, 2024, the registrant had 318,249,878 common shares outstanding.

EXPLANATORY NOTE

On March 25, 2024, TMC the metals company Inc. (the “Company”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “Form 10-K”). The purpose of this Amendment No. 1 (this “Amendment”) is to correct a typographical error in Exhibit 23.1, Consent of Ernst & Young LLP, independent registered public accounting firm (the “Consent”), Vancouver, Canada, PCAOB ID 1263, filed with the Form 10-K to reference the correct date of the report of independent registered public accounting firm referenced therein. The revised Consent is filed as Exhibit 23.1 hereto. This Amendment is also being filed to replace Exhibit 10.16, Amended and Restated Executive Employment Agreement, dated November 11, 2022, by and between DeepGreen Metals UAE and Erika Ilves (the “Employment Agreement”), with the correct version. Due to an administrative oversight, an incorrect version of the Employment Agreement was inadvertently filed as Exhibit 10.16.

This Amendment speaks as of the filing date of the Form 10-K and does not reflect events occurring after the filing of the Form 10-K. No other revisions are being made to the Company’s financial statements or any other disclosure contained in the Form 10-K. This Amendment is an exhibit-only filing. Except for Exhibit 10.16 and Exhibit 23.1, this Amendment does not otherwise update any exhibits as originally filed or previously amended.

In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by the Company’s principal executive officer and principal financial officer are filed herewith as exhibits to this Amendment pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act. As no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. The Company is not including certifications pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as no financial statements are being filed with this Amendment.

Part IV

Item 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(3) Exhibits.

+            Management contract or compensatory plan or arrangement.

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ATTACHMENTS / EXHIBITS

EXHIBIT 10.16

EXHIBIT 23.1

EXHIBIT 31.1

EXHIBIT 31.2

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