Company: FORFF
Filing Date: 2025-03-31
Form Type: 6-K
Source: 0001558370-25-004074
Chunk: 0

Company: Fortis Inc.
Filing Date: 2025-03-31
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of March, 2025

Commission File Number: 001-37915

Fortis Inc.

Fortis Place, Suite 1100

5 Springdale Street

St. John’s, Newfoundland and Labrador

Canada, A1E 0E4

(Address of Principal Executive Office)</div>

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F: Form 20-F ☐ Form 40-F ☑

EXHIBITS

| Exhibit |   | Description                                                                                             |
| ​       | ​ | ​                                                                                                       |
| 99.1    | ​ | Notice of Annual Meeting and Management Information Circular                                            |
| 99.2    | ​ | Form of Proxy – Annual Meeting of Fortis Inc. to be held on May 8, 2025                                 |
| 99.3    | ​ | Notice of Meeting and of Availability of Proxy Materials for Fortis Inc. Annual Meeting of Shareholders |

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, thereunto duly authorized.

| ​                    
 ​                    
 Date: March 31, 2025 | Fortis Inc.       
 (Registrant)      
 ​                 
 /s/ James R. Reid |                                                                  |
|:---------------------|:------------------|:-----------------------------------------------------------------|
|                      | By:               | James R. Reid                                                    |
|                      | Title:            | Executive Vice President, Sustainability and Chief Legal Officer |