Company: RTNTF
Filing Date: 2025-07-30
Form Type: 6-K
Source: 0001628280-25-036552
Chunk: 0

Company: RIO TINTO LTD
Filing Date: 2025-07-30
Form: 6-K
Chunk 0
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### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, DC 20549

#### FORM 6-K

### REPORT OF FOREIGN PRIVATE ISSUER

#### PURSUANT TO RULE 13A-16 OR 15D-16 UNDER

#### THE SECURITIES EXCHANGE ACT OF 1934
<div align='center'>30 July 2025</div>

| Commission file number:001-10533                |     | Commission file number:001-34121               |
| Rio Tinto plc                                   |     | Rio Tinto Limited                              |
|                                                 |     | ABN 96 004 458 404                             |
| (Translation of registrant’s name into English) |     | -Translation of registrant’s name into English |
| 6 St James’s Square                             
 London,SW1Y 4AD,United Kingdom                  
 (Address of principal executive offices)        |     | Level 43, 120 Collins Street                   
 Melbourne,Victoria 3000,Australia              
 (Address of principal executive offices)       |

<div align='center'>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 X Form 40-F ___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ___

EXHIBITS</div>

| 99.1 |     | 30 July 2025 |     | Rio Tinto - 2025 interim results |

### SIGNATURES
<div align='center'>Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorised.</div>

| Rio Tinto plc 
 (Registrant)  |     |                         |     | Rio Tinto Limited 
 (Registrant)      |     |                         |
| By            |     | /s/ Peter Cunningham    |     | By                |     | /s/ Peter Cunningham    |
| Name          |     | Peter Cunningham        |     | Name              |     | Peter Cunningham        |
| Title         |     | Chief Financial Officer |     | Title             |     | Chief Financial