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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of  May 2023

Commission File Number 001-36487

Atlantica Sustainable Infrastructure plc

(Exact name of Registrant as specified in its charter)

Not applicable

(Translation of Registrant’s name into English)

Great West House, GW1, 17th floor

Great West Road

Brentford, TW8 9DF

United Kingdom

Tel.: +44 20 7098 4384

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

This Report on Form 6-K is incorporated by reference into the Registration Statement on Form F-3 of the Registrant filed with the Securities and Exchange Commission on August 3, 2021 (File 333-258395).

May 31, 2023 – On May 30, 2023, Atlantica Sustainable Infrastructure plc (“Atlantica,” NASDAQ: AY), entered into the eight amendment to its Revolving Credit Facility according to which the maturity was extended to December 31, 2025.

Exhibits

4.24 Eight Amendment to the Credit and Guaranty Agreement, dated May 30, 2023.

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.

Atlantica Sustainable Infrastructure plc
By:	/s/ Santiago Seage
	Name:	Santiago Seage
	Title:	Chief Executive Officer

Date: May 31, 2023