Company: TMCWW
Filing Date: 2025-07-18
Form Type: DEFA14A
Source: 0001104659-25-068871
Chunk: 0

Company: TMC the metals Co Inc.
Filing Date: 2025-07-18
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 0-1 |

| You May Vote Your Proxy When You View                                                                                         
 The Material On The Internet. You Will Be                                                                                     
 Asked To Follow The Prompts To Vote                                                                                           
 Your Shares By Proxy.                                                                                                         
 TMC the metals company Inc.                                                                                                   
 1111 West Hastings Street, 15th Floor,                                                                                        
 Vancouver BC V6E 2J3                                                                                                          
 NOTICE OF SPECIAL MEETING                                                                                                     
 OF SHAREHOLDERS                                                                                                               
 to be held on                                                                                                                 
 Thursday, August 28, 2025                                                                                                     
 *Shareholders are cordially invited to attend the virtual Special Meeting and to vote                                         
 on the Internet or any Mobile device.                                                                                         
 Dear Shareholder,                                                                                                             
 Notice is hereby given that a Special Meeting of Shareholders of TMC the metals company Inc. (the “Company”) will be          
 held in a virtual format on Thursday, August 28, 2025 at 10:00 a.m. EDT. You will be able to attend the Special Meeting, vote 
 your shares electronically and submit your questions during the live audio webcast of the meeting if you were a holder of the 
 Company’s common shares at the