Company: HYNLY
Filing Date: 2025-08-14
Form Type: 6-K
Source: 0001193125-25-180397
Chunk: 0

Company: Hydro One Ltd
Filing Date: 2025-08-14
Form: 6-K
Chunk 0
---
### SECURITIES AND EXCHANGE
COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16or 15d-16

under the Securities Exchange Act of 1934

For the month of: August 2025

Commission File Number: 333-225519-01

### HYDRO ONE LIMITED
(Translation of Registrant’s name into English)

483 Bay Street, South Tower, 8th Floor, Toronto Ontario M5G 2P5 Canada

(Address of principal executive offices)

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 ☒

SIGNATURE 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.

| HYDRO ONE LIMITED       |
| /s/ Cassidy McFarlane   |
| Name: Cassidy McFarlane |
| Title: General Counsel  |
| Date: August 14, 2025   |

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