Public Announcement-Open Offer

November 5, 2026 BSE Limited National Stock Exchange of India Limited Corporate Relations Exchange Plaza, C-1, Block G, P. J. Towers, Dalal Street, Bandra Kurla Complex, Bandra (East), Mumbai- 400 001 Mumbai – 400 051 Sub: Open offer by Indo Borax and Chemicals Limited ("Acquirer") along with Zenrock Chemicals Private Limited ("PAC") to the public shareholders of Kronox Lab Sciences Limited ("Target Company") for acquisition of equity shares pursuant to Regulations 3(1) and 4 and other applicable provisions of the Securities and Exchange Board of India (Substantial Acquisition of Shares and Takeovers) Regulations, 2011, as amended ("SEBI (SAST) Regulations") ("Offer"). Dear Madam / Sir, This has reference to the captioned Open Offer and our letters dated August 20, 2026 for submission of Public Announcement (“PA”), August 28, 2026 for submission of Detailed Public Statement (“DPS”), September 4, 2026 for submission of Draft Letter of Offer (“DLOF”), and October 29, 2026 for submission of Letter of Offer (“LOF”). In accordance with Regulation 18(7) of the SEBI (SAST) Regulations, the Acquirer and the PAC has published Offer Opening Public Announcement cum Corrigendum dated November 4, 2026 in the following newspapers on November 5, 2026: Newspapers Language Edition Financial Express English All Editions Jansatta Hindi All Editions Navshakti Marathi Mumbai Edition Loksatta – Jansatta Gujarati Vadodara Edition As the equity shares of the Target Company are listed on your stock exchange, we enclose herewith a published copy of the Offer Opening Public Announcement cum Corrigendum that appeared in the Financial Express, Jansatta, Navshakti and Loksatta – Jansatta. The Tendering Period for the Offer will commence on November 6, 2026. Capitalised terms used but not defined in this letter bear the meaning ascribed to it in the LOF. Should you require any further information / clarifications on the same, please contact the following persons: Contact Person Mobile Telephone Email Yogesh Malpani Vice President +91 89767 58023 yogesh.malpani@iiflcap.com Dhruv Bhavsar AVP +91 79779 58803 dhruv.bhavsar@iiflcap.com Thanking you, Yours faithfully, For IIFL Capital Services Limited (formerly known as IIFL Securities Limited) Name: Yogesh Malpani Designation: Vice President Encl: As above IIFL Capital Services Limited (formerly known IIFL Securities Limited) Corporate Identity Number: L99999MH1996PLC132983 | SEBI Merchant Banking Registration Number: INM000010940 24th Floor, One Lodha Place, Senapati Bapat Marg, Lower Parel, Mumbai – 400013. Tel: +91 22 4646 4600 Fax: +91 22 2493 1073 Regd. Office: IIFL House, Sun lnfotech Park, Road No. 16V, Plot No. B-23, MIDC, Thane Industrial Area, Wagle Estate, Thane - 400 604 Tel: (91-22) 3929 4000/ 4103 5000 • Fax: (91-22) 2580 6654• E-mail: info.ib@iiflcap.com; secretarial@iifl.com • Website: www.iiflcap.com; www.iiflcapital.com ðzkuËhk økwhwðkh 05 LkðuBçkh, 2026 05 marathi.freepressjournal.in