Please refer the enclosed file.

HZL/2026-27/SECY/74 August 14, 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/Madam, Sub: Disclosure under Regulation 30 & 51(2) of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, as amended (“SEBI Listing Regulations”) This is to inform you that the Ministry of Mines, Government of India vide order no. Met3-10/2/2020- Metal III dated August 14, 2026, has conveyed the appointment of Dr. Yogesh Attray (DIN- 07654847), as non- official part-time Director on the Board of Hindustan Zinc Limited (HZL), for a period of 3 years w.e.f. date of notification or until further orders, whichever is earlier. Further, the Company is taking necessary action to complete the requisite formalities and disclosures in this regard will be submitted in due course of time. The Company received the aforesaid letter from Ministry of Mines via email on August 14, 2026, at 02:34 p.m. We request you to please take the above on record. Thanking You Yours faithfully, For Hindustan Zinc Limited Aashhima V Khanna Company Secretary & Compliance Officer Sensitivity: Public (C4)