Commencement of commercial production/operations

M&B Engineering Ltd. Registered Office: ‘MB House', 51, Chandroday Society, Stadium Road, Naranpura, Ahmedabad - 380 014, Gujarat, India CIN: L45200GJ1981PLC004437 I T: +91 79 2640 5563/ 2646 1314 | E: info@mbphenix.com / info@mbproflex.com 26th October, 2026 To, To National Stock Exchange of India Limited BSE Limited Exchange Plaza, Phiroze Jeejeebhoy Towers, Bandra Kurla Complex, Dalal Street, Bandra (East), Mumbai – 400 001 Mumbai – 400051 Symbol: MBEL Script Code: 544470 Sub: Disclosure under Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“SEBI Listing Regulations”) – Commencement of Commercial Production Dear Sir/ Madam, Pursuant to Regulation 30 read with Para B of Part A of Schedule III of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“SEBI Listing Regulations”), we wish to inform you that, the Company has commenced commercial production under Phase-I of the brownfield at its PEB manufacturing facility located at Sanand, Gujarat with effect from 26th October, 2026. The said expansion will augment the PEB manufacturing capacity by 20,000 MTPA, thereby increasing the manufacturing capacity at the Sanand Plant from 72,000 MTPA to 92,000 MTPA and the total PEB Capacity from 103800 MTPA to 123800 MTPA of the Company including both Sanand and Cheyyar Plant. This is for your information and records please. Thanking you, Yours faithfully, for M & B ENGINEERING LIMITED PALAK D. PAREKH COMPANY SECRETARY & COMPLIANCE OFFICER (Membership No. F10209)