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 December 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:

OTHER NEWS

Subject: Disclosure under Indian Listing Regulations

IBN

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

This is further to the disclosure made by ICICI Bank Limited (the Bank) dated September 30, 2025 regarding the receipt of a Show-Cause Notice (SCN) from the Additional Commissioner of CGST and CEx., Mumbai East Commisionerate on services provided by the Bank to customers maintaining specified minimum balances in their accounts.

On December 17, 2025 at 01:08 p.m., the Bank has received an Order under Section 73 of the Maharashtra Goods and Services Tax (GST) Act, 2017 from the above authority raising a GST demand amounting to ₹ 237,90,04,448/- (Tax ₹ 216,27,31,316/- and penalty ₹ 21,62,73,132/-) along-with interest as applicable for the same subject matter.

While the Bank is in litigation (including writ petition) on similar issue raised in orders/SCNs in the past, since the aggregate/cumulative amount involved in the above crosses the materiality threshold, this matter is being reported.

The Bank will take appropriate steps, including contesting the Order through a writ petition/appeal within prescribed timelines.

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. 

ICICI Bank Limited ICICI Bank Towers Bandra-Kurla Complex Mumbai 400 051, India.

Tel.: 022- 4008 8900 Email:companysecretary@icicibank.com Website www.icicibank.com CIN.: L65190GJ1994PLC021012

Regd. Office: ICICI Bank Tower, Near Chakli Circle, Old Padra Road, Vadodara 390007. India