Please refer the enclosed file.

HZL/2026-27/SECY/68 July 31, 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 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 – Completion of tenure of CEO & Whole time Director Pursuant to Regulation 30 read with Schedule III of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 ("SEBI Listing Regulations"), we hereby inform you that Mr. Arun Misra (DIN: 01835605) will ceased to be the CEO & Whole-time Director of the Company upon completion of his tenure, with effect from the close of business hours on July 31, 2026. The Board of Directors and the management of the Company place on record their sincere appreciation for the exemplary leadership, valuable guidance and significant contributions of Mr. Arun Misra during his tenure with the Company, and extend their best wishes for his continued success and future endeavours. The details as required under Regulation 30 of the SEBI Listing Regulations read with SEBI Master Circular No. SEBI/HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026, is enclosed and marked as Annexure-I. 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) Annexure -I Cessation of CEO & Whole-time Director and KMP: Sr. Particulars Details 1. Reason for change viz. appointment, Completion of tenure of Mr. Arun Misra, (DIN: 01835605) as CEO & reappointment, resignation, removal, Whole time Director of the Company. death or otherwise 2. Date of appointment/ re- Mr. Misra will cease to be a CEO & Whole time Director with effect appointment/cessation & term of from July 31, 2026. appointment/re-appointment. 3. Brief Profile (in case of appointment) Not Applicable 4. Disclosure of relationships between Not Applicable Directors (in case of appointment of a director). Sensitivity: Public (C4)