Pursuant to Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018, enclosed please find a certificate received from M/s. Niche Technologies Private Limited, the Registrar and Share Transfer Agent of the Company for the quarter ended 30th September, 2026

Date: 09.10.2026 Department of Corporate Services BSE Limited P.J. Towers, Dalal Street, Mumbai- 400 001 Dear Sir/Madam, Sub: Certificate under Regulation 74(5) of the SEBI (Depositories and Participants) Regulations, 2018 for the Quarter ended 30th September, 2026 Pursuant to Regulation 74(5) of the Securities and Exchange Board of India (Depositories and Participants) Regulations, 2018, enclosed please find a certificate received from M/s. Niche Technologies Private Limited, the Registrar and Share Transfer Agent of the Company for the quarter ended 30th September, 2026. Thanking you, Yours faithfully For RDB Rasayans Ltd. Shradha Dalmia Company Secretary cum Compliance Officer Mem No. A47417 Encl: As above C/c: C/c: To To National Securities Depository Ltd Central Depository Services (India) Limited 4th & 5th Floor, 'A" Wing, Trade World, Marathon Futurex,A-Wing, 25th Floor, NM Kamala Mills Compound, Joshi Marg,Lower Parel,Mumbai 400013 Lower Parel, Mumbai - 400 013 Works: 126, Basudevpur, HPL Link Road, P.0.-Khanjanchak, Haldia-721602, Purba Medinipur, West Bengal, India Phone: +91-3224 277088/278108 Fax: +91-3224 277340 • E-mail: rdbhaldia@sancharnet.in Website: www.rdbgroup.in ClN- L36999WB1995PLC074860 NICH NICHE TECHNOLOGIES PRIVATE LIMITED (An ISO 9001:2015 Certified Company) (Registrars & Share Transfer Agent) CIN: U74140WB1994PTC062636 3A, Auckland Place, 7th Floor, Room No. 7A & 7B, Kolkata – 700 017 Phones: (033) 2280 6616 / 6617 / 6618 Fax: (033) 2280 6619 E-Mail: nichetechpl@nichetechpl.com Website: https://www.nichetechpl.com Date: 06.10.2026 RDB Rasayans Ltd. 8/1, Lal Bazar Street Bikaneer Building, 3rd Floor, Room No. 09 Kolkata - 700001 Dear Sir / Madam Sub.: Confirmation Certificate in the matter of Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018 for the Quarter Ended 30th September 2026 In reference to the above captioned subject, we as RTA of your company hereby confirm that the securities received from the depository participants for dematerialisation during the quarter ended 30th September 2026, were confirmed (accepted/rejected) to the depositories and that securities comprised in the said certificate have been listed on the stock exchanges where the earlier issued securities are listed. We hereby also confirm that the security certificates received for dematerialisation have been mutilated and cancelled after due verification and the name of the depository have been substituted in the register of members of the company as the registered owner. For Niche Technologies Pvt. Ltd. (Registrar & Share Transfer Agent) ( Ashok Sen ) Manager – EDP