Completion of the acquisition of 64.26% of the share capital of Kronox Lab Sciences Limited.

i INDO BORAX & CHEMICALSL TD. Regd. Office : 506, 5th Floor, Tulsiani Chambers, Free Press Journal Marg, Nariman Point, Mumbai - 400021, India. Ph.: 022 35218591 • CIN: L24100MH1980PLC023177 Email : info@indoborax.com • Website : www.indoborax.com Date: September 29, 2026 BSE Limited National Stock Exchange of India Limited The Corporate Relations Department, Exchange Plaza, Bandra-Kurla Complex, 2si1i Floor, Phiroze Jeejeebhoy Towers, Bandra (East), Mumbai 400 051 Dalal Street, Stock Code - INDOBORAX Mumbai- 400 001 Stock Code - 524342 Dear Sir/Madam, Sub: Disclosure under Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 ("SEBI Listing Regulations") - For the completion of the acquisition of 64.26% of the share capital of Kron ox Lab Sciences Limited We refer to our earlier intimation dated August 20, 2026 under Regulation 30 of the SEBI Listing Regulation ("Original Intimation"), wherein we had informed the Stock Exchanges regarding the execution of the share purchase agreement dated August 20, 2026 ("SPA") between Mr. Ketan Vinodchandra Ramani, Mr. Pritesh Vinodchandra Ramani, Mr. Jogindersingh Gianchand Jaswal (together, the "Sellers"), lndo Borax & Chemicals Limited ("Purchaser") and Zenrock Chemicals Private Limited, in relation to the acquisition by the Purchaser of an aggregate of 2,38,44,000 equity shares held by the Sellers in Kronox Lab Sciences Limited ("Target Company"), constituting 64.26% of the total paid-up equity share capital of the Target Company. Further to the above, we wish to inform you that the said acquisition by the Purchaser of 2,38,44,000 equity shares of the Target Company, constituting 64.26% of the total paid-up equity share capital of the Target Company, has been completed today, i.e., on September 29, 2026. 'Save as stated above, there is no change in the other details as required under Regulation 30 read with Schedule III of the SEBI Listing Regulations which were disclosed in the Original Intimation. We request you to kindly take the above on record. Thanking you. Yours faithfully, [Signature page follows] INDO BORAX & CHEMICALS LTD. Regd. Office : 506, 5th Floor, Iulslanl Chambers, Free Press Journal Marg, Nariman Point, Mumbai - 400021, India. Ph.: 022 35218591 • CIN : L24100MH 1980PLC023177 Email : Info 11 lndoborax.com • Website : www.indoborax.com Signed and delivered for an on behalf of INDO BORAX & CHEMICALS LIMITED Name: Sunil Malhotra Designation: Director Date: September 29, 2026 Place: Mumbai