General Updates

GlaxoSmithKline Pharmaceuticals Limited GSK House, Dr. Annie Besant Road, Worli, Mumbai - 400 030 Tel No: +91 22 2495 9595 Fax No: +91 22 2495 9494 Web: www.gsk-india.com Email: askus@gsk.com 1st September 2026 BSE LIMITED THE NATIONAL STOCK EXCHANGE OF INDIA LIMITED Phiroze Jeejeebhoy Towers Exchange Plaza, 5th Floor, Plot No. C/1, G Block Dalal Street Bandra-Kurla Complex, Bandra (East) Mumbai - 400001 Mumbai - 400051 Dear Sirs, Sub: Corrigendum to the Notice of Postal Ballot dated August 3, 2026 We wish to inform you that, the Company has issued a postal ballot notice dated August 3, 2026 (“Notice”) to its Members seeking their approval on the matters set out therein. A Corrigendum to the Notice has been sent through email to its members today i.e.1st September 2026 and will publish a notice in the newspaper for the same. The Corrigendum relates to a typographical error in point no. 3(i) of the Explanatory Statement to the said Notice in the Basic salary figure of Mr. Akshikar. The Basic salary should be read as Rs. 24,00,000/- per month instead of Rs. 24,00,0000/- per month. This Corrigendum forms an integral part of the Notice together with the Explanatory Statement annexed thereto, which was circulated to the Members of the Company on August 13, 2026, and the said notice shall be read with this Corrigendum. All other contents of the Notice together with the Explanatory Statement thereof, save and except as modified or supplemented by this Corrigendum, shall remain unchanged. The Corrigendum has been uploaded on the website of the Company at: https://india-pharma.gsk.com/en- in/investors/shareholder-information/postal-ballot/. This is for your information and record. Thanking you, Yours faithfully, For GlaxoSmithKline Pharmaceuticals Limited Ajay Nadkarni Vice President - Administration, Real Estate & Company Secretary CIN: L24239MH1924PLC001151