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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a -16 OR

15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2025

Commission File Number: 001-15002

ICICI Bank Limited
(Translation of registrant’s name into English)

ICICI Bank Towers,
Bandra-Kurla Complex
Mumbai, India 400 051
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file
annual reports under cover Form 20-F or Form 40-F.

Table of Contents

Items:

1. Other news

OTHER NEWS

Subject: Disclosure under Indian Listing Regulations

IBN

ICICI Bank Limited (the ‘Bank’) Report on Form 6-K

This is further to the disclosures made by ICICI Bank Limited (“Bank”) dated February 12, 2025, June 27, 2025 and July 9, 2025 with regard to investment in our subsidiary, ICICI Prudential Asset Management Company Limited (“Company”).

Reserve Bank of India has, vide its letter dated September 12, 2025, accorded its approval to the Bank for purchase of additional shareholding of up to 2% in the Company, to maintain its majority shareholding, subject to compliance with applicable regulations.

Please take the above information on record.

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 authorised.