Commencement of commercial production/operations

June 26, 2026 DCS-CRD Listing Compliance BSE Limited National Stock Exchange of India Limited First Floor, New Trade Wing Exchange Plaza, 5th Floor Rotunda Building, Phiroze Jeejeebhoy Towers Plot No. C/1, ‘G ’Block Bandra- Kurla Complex Dalal Street, Fort Mumbai 400 023 Bandra East Mumbai 400 051 Fax No.2272 3121/2037/2039 Fax No.2659 8237/8238 Stock Code: 543213 Stock Code: ROSSARI Dear Sir/Madam, Sub.: Disclosure under Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 Ref.: Set up of a blending facility by Unistar Thai Co. Limited We refer to our letter dated December 11, 2024, where we have informed acquisition of 100% equity share capital of Unistar Thai Co. Limited (“Unistar”) on December 10, 2024 by Rossari Global FZCO (erstwhile Rossari Global DMCC), wholly owned subsidiary of the Company. Pursuant to Regulation 30(9) read with Para B of Part A of Schedule III of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“Listing Regulations”), we hereby inform that Unistar has set up a blending facility (“Facility”) located in Thailand, with an installed capacity of 5000 MTPA and situated on a land area admeasuring approximately ~1,860 square meter. The Facility is strategically positioned to serve as a regional technical hub, enabling the Company to address the growing Southeast Asian market with agility through customized formulations tailored to local requirements. It offers flexible manufacturing capabilities across powders, granules and liquids, supported by dedicated storage capacity for surfactants and other key raw materials, ensuring supply chain resilience and operational efficiency. The same may please be taken on record and suitably disseminated to all concerned. Thanking you, Yours Sincerely, For Rossari Biotech Limited Parul Gupta Company Secretary & Head - Legal Membership No.: A38895