Please refer the enclosed file.

HZL/2026-27/SECY/72 August 11, 2026 BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers Exchange Plaza, 5th Floor Plot No., C/l, G Block Dalal Street, Fort Bandra-Kurla Complex, Bandra (East), Mumbai – 400 001 Mumbai – 400 051 Kind Attn: General Manager – Department Kind Attn: Head Listing & Corporate of Corporate Services Communication Scrip Code: 500188 Trading Symbol: HINDZINC Dear Sir/Ma’am, Sub: Disclosure under Regulation 30 and 51 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, as amended (“SEBI Listing Regulations”) Pursuant to Regulations 30 and 51 of the SEBI Listing Regulations, we hereby inform you that CRISIL Ratings Limited has reaffirmed the Company's credit ratings for Commercial Paper, Non-Convertible Debentures and Bank Facilities, as detailed below: Reaffirmed Ratings: Instrument Rating Commercial Paper Crisil A1+ Non-Convertible Debentures Crisil AAA/Stable Bank Facilities (Long Term) Crisil AAA/Stable Bank Facilities (Short Term) Crisil A1+ The detailed rationale issued by CRISIL Ratings Limited is available at the following link: CRISIL Ratings The Company received the aforesaid rating reaffirmation from CRISIL Ratings Limited via email on August 10, 2026, at 4:41 p.m. We request you to kindly take the above information on record. Thanking you. Yours faithfully, For Hindustan Zinc Limited Aashhima V Khanna Company Secretary & Compliance Officer Sensitivity: Public (C4)