Credit Rating assigned by S&P Global Ratings.

IDFCFIRSTBANK/SD/122/2026-27 August 21, 2026 National Stock Exchange of India Limited BSE Limited Mumbai 400 051 Mumbai 400 001 NSE Symbol: IDFCFIRSTB BSE Scrip Code: 539437 Sub.: S&P Global Ratings assigns Investment Grade Rating to IDFC FIRST Bank's Senior Notes Ref.: Disclosure under Regulation 30 of the SEBI (LODR) Regulations Dear Sir/ Madam, With reference to our recent disclosures on the subject, this is to inform you that S&P Global Ratings has today assigned 'BBB-' long-term issue rating to the Bank’s US$600 million Senior Notes. The rating is consistent with the issuer credit rating of BBB-/Stable/A-3, earlier disclosed by the Bank on August 13, 2026. The Publication made by S&P Global Ratings can be accessed at: https://www.spglobal.com/ratings/en/regulatory/article/-/view/sourceId/101702722 You are requested to kindly take the same on record. Yours faithfully, For IDFC FIRST Bank Limited Satish Gaikwad General Counsel and Company Secretary IDFC FIRST Bank Limited Corporate Office: IDFC FIRST Bank Tower, (The Square), C-61, G Block, Bandra-Kurla Complex, Bandra (East), Mumbai - 400 051, Maharashtra. Tel: +91 22 7132 5500 Registered Office: KRM Tower, 7th Floor, No. 1, Harrington Road, Chetpet, Chennai 600 031, Tamil Nadu. Tel: +91 44 4571 6477 CIN: L65110TN2014PLC097792 | E-mail: bank.info@idfcfirstbank.com; | Website: www.idfcfirst.bank.in