Company: RTNTF
Filing Date: 2025-05-01
Form Type: 6-K
Source: 0001628280-25-021425
Chunk: 0

Company: RIO TINTO LTD
Filing Date: 2025-05-01
Form: 6-K
Chunk 0
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### 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 April 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 April 2025 entitled ‘ Total Voting Rights and Issued Capital’ .

99.2 Media release dated 4 April 2025 entitled ‘ Rio Tinto increases Australian supplier spend to A$17.7 billion’ .

99.3 Stock Exchange announcement dated 7 April 2025 entitled ‘ Appendix 3G – Notification of issue, conversion or payment up of unquoted equity securities ’.

99.4 Stock Exchange announcement dated 7 April 2025 entitled ‘ Appendix 3G – Notification of issue, conversion or payment up of unquoted equity securities ’.

99.5 Stock Exchange announcement dated 7 April 2025 entitled ‘ Appendix 3H – Notification cessation of securities’ .

99.6 Stock Exchange announcement dated 8 April 2025 entitled ‘ Notice of dividend currency exchange rates 2024 final dividend ’.

99.7 Stock Exchange announcement dated 8 April 2025 entitled ‘ Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP) ’.

99.8 Media release dated