Certificate under Reg 74(5) of SEBI (DP) Regulations, 2018

Date: October 09, 2026 The Secretary, Listing Department Bombay Stock Exchange Ltd Phiroze Jeejeebhoy Towers, Dalal Street, Mumbai – 400 001, MH, IN. Sub: Submission of Compliance Certificate under Regulation 74(5) of Securities and Exchange Board of India (Depositories and Participants) Regulations, 2018 for the quarter/half year ended September 30, 2026 Reference: Security ID: KARBON / Security Code: 544511 / ISIN: INE0V8A01016 Dear Sir/Madam, With reference to the above cited subject, we are enclosing herewith the Certificate under Regulation 74(5) of Securities and Exchange Board of India (Depositories and Participants) Regulations, 2018 for the quarter/half year ended September 30, 2026, received from M/s. Maashitla Securities Private Limited, Registrar and Share Transfer Agent of the Company. Kindly take the same on your record. Thanking You. Yours Faithfully, For Karbonsteel Engineering Limited Siddhi Parmar Company Secretary & Compliance Officer Mem No:- ACS 60563 Enclosed: As above National Securities Depository Limited Central Depository Services (India) Ltd. 301, 3rd Floor, Naman Chambers, Marathon Futurex, A-Wing, 25th Floor, G Block, Plot No- C-32, Bandra Kurla Complex, Mafatlal Mills Compound, NM Joshi Marg, Bandra (East), Mumbai – 400051. Lower Parel (E), Mumbai - 400 013.