Company: TMCWW
Filing Date: 2025-08-29
Form Type: 8-K12B
Source: 0001104659-25-084948
Chunk: 0

Company: TMC the metals Co Inc.
Filing Date: 2025-08-29
Form: 8-K12B
Chunk 0
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<div align='center'>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):
August 28, 2025

TMC THE METALS COMPANY INC.

(Exact name of registrant as specified in its charter)</div>

| British Columbia, Canada        | 001-39281               | Not Applicable     |
| (State or other jurisdiction of 
 incorporation)                  | -Commission File Number | -IRS Employer      
 Identification No. |

| 1111 West Hastings Street, 15th Floor 
 Vancouver, British Columbia           
 (Address of principal executive       
 offices)                              |     | V6E 2J3    
 (Zip Code) |

<div align='center'>Registrant’s telephone number, including
area code: ( 888) 458-3420

Not applicable
(Former name or former address, if changed since last report)</div>

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:

| ¨ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ¨ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |

| ¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ¨ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

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

| Title of each class                                                                                                         |     | Trading   
 Symbol(s) |     | Name of each exchange on    
 which registered            |
| TMC Common Shares without par value                                                                                         |     | TMC       |     | The Nasdaq Stock Market LLC |
| Redeemable warrants, each whole warrant exercisable for one TMC Common Share, each at an exercise price of $11.50 per share |     | TMCWW     |     | The Nasdaq Stock Market LLC |

Indicate by