6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSIONWashington, 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:

OTHERNEWS

Subject:Disclosure under Indian Listing Regulations

IBN

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

The Bank has made the below announcement to the Indian Stock Exchanges:

This is further to the disclosure made by ICICI Bank Limited (“the Bank”) on December 8, 2025 with regard to execution of the share purchase agreement (“SPA”) with Prudential Corporation Holdings Limited (“PCHL”) for the acquisition of up to 2% of the fully diluted pre-IPO share capital of our subsidiary, ICICI Prudential Asset Management Company Limited (“ICICI AMC”) from PCHL.

In accordance with the SPA, all the closing conditions have been completed today at 8:42 p.m. and the Bank now holds 53.0% of ICICI AMC’s paid-up equity share capital.

We request you to kindly take the same on record.

Certain definitionsin this release relating to a future period of time (including inter alia concerning our future business plans or growth prospects) areforward-looking statements intended to qualify for the 'safe harbor' under applicable securities laws including the US Private SecuritiesLitigation Reform Act of 1995. Forward-looking statements are statements of future expectations that are based on management’scurrent expectations and assumptions and involve known and unknown risks and uncertainties that could cause actual results, performanceor events to differ materially from those expressed or implied in these statements. These forward-looking statements are identified bytheir use of terms and phrases such as “aim,” “ambition,” “anticipate,” “aspire,” “aspiration”,“believe,” “commit,” “commitment,” “could,” “desire,” “estimate,”“expect,” “goals,” “intend,” “may,” “milestones,” “objectives,”“outlook,” “plan,” “probably,” “project,” “risks,” “schedule,”“seek,” “should,” “target,” “vision,” “will,” “would” and similarterms and phrases. Such forward-looking statements involve a number of risks and uncertainties that could cause actual results to differmaterially from those in such forward-looking statements. These risks and uncertainties include, but are not limited to statutory andregulatory changes, international economic and business conditions; political or economic instability in the jurisdictions where we haveoperations or which affect global or Indian economic conditions, increase in non-performing loans, unanticipated changes in interestrates, foreign exchange rates, equity prices or other rates or prices, our growth and expansion in business, the adequacy of our allowancefor credit losses, the actual growth in demand for banking products and services, investment income, cash flow projections, our exposureto market risks, changes in India’s sovereign rating, as well as other risks detailed in the reports filed by us with the UnitedStates Securities and Exchange Commission. Any forward-looking statements contained herein are based on assumptions that we believe tobe reasonable as of the date of this release. ICICI Bank undertakes no obligation to update forward-looking statements to reflect eventsor circumstances after the date thereof. Additional risks that could affect our future operating results are more fully described inour

filings withthe United States Securities and Exchange Commission. These filings are available at www.sec.gov.

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.