Company: TMCWW
Filing Date: 2025-04-18
Form Type: DEFA14A
Source: 0001104659-25-036266
Chunk: 0

Company: TMC the metals Co Inc.
Filing Date: 2025-04-18
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
(Amendment No.)</div>

Filed by the Registrant x

Filed by a Party other than the Registrant
¨

Check the appropriate box:

| ¨ | Preliminary Proxy Statement                                                     |
| ¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ¨ | Definitive Proxy Statement                                                      |
| x | Definitive Additional Materials                                                 |
| ¨ | Soliciting Material Under §240.14a-12                                           |

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

(Name of Registrant as Specified
In Its Charter)

(Name of Person(s) Filing
Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| x | No fee required                                                                                     |
| ¨ | Fee paid previously with preliminary materials                                                      |
| ¨ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

| TMC THE METALS COMPANY INC.                                                                                  
 1111 West Hastings Street, 15th Floor,                                                                       
 Vancouver BC V6E 2J3                                                                                         
 Important Notice Regarding the Availability of Proxy Materials                                               
 For the 2025 Annual and Special Meeting of Shareholders                                                      
 to be Held On May 29, 2025                                                                                   
 The following Proxy Materials are available to you to review at: https://www.cstproxy.com/metals/2025        
 - the Company’s Annual Report for the year ended December 31, 2024                                           
 - the Company’s 2025 Proxy Statement                                                                         
 - the Proxy Card                                                                                             
 - any amendments or supplements to the foregoing materials that are required to be furnished to              
 shareholders                                                                                                 
 This is not a ballot. You cannot use this notice to vote your shares. This communication presents only a     
 notice of the Annual and Special Meeting of Shareholders overview of the more complete proxy materials       
 that are available to you on the Internet. We encourage you to access and review all of the important        
 information contained in the proxy materials before voting.                                                  
 If you would like to receive a paper or e-mail copy