Company: RTNTF
Filing Date: 2025-11-03
Form Type: 6-K
Source: 0000863064-25-000020
Chunk: 0

Company: RIO TINTO LTD
Filing Date: 2025-11-03
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 6-K
<div align='center'>REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16</div>

#### UNDER THE SECURITIES EXCHANGE ACT OF 1934

#### For the month of October 2025
| 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                            |     | Level 43, 120 Collins Street                   |
| London, SW1Y 4AD, United Kingdom                |     | Melbourne, Victoria 3000, Australia            |
| (Address of principal executive offices)        |     | -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 ☒ Form 40-F ☐</div>

### EXHIBITS
99.1 Stock Exchange announcement dated 1 October 2025 entitled ‘ Total Voting Rights and Issued Capital ’.

99.2 Stock Exchange announcement dated 2 October 2025 entitled ‘ Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP) ’.

99.3 Stock Exchange announcement dated 3 October 2025 entitled ‘ Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP) ’.

99.4 Stock Exchange announcement dated 3 October 2025 entitled ‘ Appendix 3Y – Change of Director’s Interest Notice ’.

99.5 Stock Exchange announcement dated 5 October 2025 entitled ‘ Form 603 – Notice of initial substantial holder’ .

99.6 Stock Exchange announcement dated 7 October 2025 entitled ‘ Robe River Joint Venture to invest $733 million to extend West Angelas iron ore mine in Western Australia’ .

99.7 Stock Exchange announcement dated 8 October 2025 entitled ‘ Appendix 3G – Notification of issue, conversion or payment up of un