This is to inform you that the Trading Window to deal with Securities of the Company will remain closed for all designated persons (including their immediate relatives) from 01 October 2026 till 48 hours after the declaration of un-audited financial results for the quarter and half year ended 30 September 2026.

Ref. No: HSCL / Stock-Ex/2026-27/63 Date: 25/09/2026 E-mail: monika@himadri.com Ref: Listing Code: 500184 Ref: Listing Code: HSCL BSE Limited National Stock Exchange of India Ltd Department of Corporate Services Exchange Plaza, C-1, Block-G P. J. Towers, 25th Floor, Bandra Kurla Complex, Dalal Street, Bandra (E) Mumbai- 400 001 Mumbai- 400 051 Sub: Closure of Trading Window Dear Sir/Madam, This is to inform you that pursuant to Company’s Code of Conduct to regulate, monitor and report of trading by Designated Persons, read with SEBI (Prohibition of Insider Trading) Regulations, 2015, the Trading Window to deal with securities of the Company will remain closed for all designated persons (including their immediate relatives) from 01 October 2026 till 48 hours after the declaration of un- audited financial results for the quarter and half year ended 30 September 2026. The Trading window will open after 48 hours from the announcement of the Company’s un-audited financial results for the quarter and half year ended 30 September 2026 to the Stock Exchanges. The above information will also be available on the website of the Company at www.himadri.com This is for your information and records. Thanking you, Yours faithfully, For Himadri Speciality Chemical Ltd Monika Saraswat Company Secretary & Compliance Officer ACS: 29322