UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 28, 2026

TMC THE METALS COMPANY INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (888) 458-3420

Not applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

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. ¨

The Company’s Annual Meeting was held on May 28, 2026 at 10:00 a.m. EDT. The actions set forth below were taken. Of the Company's 433,188,187 common shares outstanding and eligible to vote as of the record date of April 2, 2026, a quorum of more than two shareholders representing 213,376,047 shares, or 49.3% of the eligible shares, was present or represented by proxy at the Annual Meeting. Each of the matters set forth below is described in detail in the Company's Proxy Statement filed with the Securities and Exchange Commission (the “SEC”) on April 17, 2026, as supplemented by Supplement No. 1 to Proxy Statement filed with the SEC on May 26, 2026 (together, the “Proxy Statement”).

1.             Set the number of directors at ten (10).

2.              Election of the following directors of the Company, to serve until the Company's 2027 annual meeting of shareholders and until their respective successors have been elected and qualified.

3.              Appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the 2026 fiscal year.

4.              The approval, on a non-binding advisory basis, of the compensation paid to the Company's named executive officers, as disclosed in the Company's Proxy Statement (the “say-on-pay” vote).

5.              The approval, on a non-binding advisory basis, of the frequency of holding an advisory vote on the compensation of the Company's named executive officers (the “say-on-frequency” vote).

The frequency of two years received a majority of the votes cast and, therefore, as described in the Proxy Statement is the frequency approved by the Company’s shareholders. The results of this vote were consistent with the recommendation of the Company’s Board of Directors that the advisory vote on the compensation of the Company’s named executive officers be held every two years. Accordingly, the Company will hold an advisory “say-on-pay” vote every two years until the next required advisory “say-on-frequency” vote. As a result, the Company will hold its next advisory vote on the compensation of its named executive officers at its 2028 annual meeting of shareholders.

Banks, brokerage firms and other nominees did not have discretionary authority to vote customers’ unvoted shares held by the firms in street name on any of the proposals set forth above and, therefore, there were no broker non-votes on any of the proposals.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.