Update regarding Capacity Addition pursuant to Regulation 30 of the SEBI (LODR) Regulations, 2015.

www.stl.tech September 3, 2026 National Stock Exchange of India Limited BSE Limited Exchange Plaza, 5th Floor, Phiroze Jeejeebhoy Towers, Plot No. C-1, G Block, Dalal Street, Bandra Kurla Complex, Bandra (East) Mumbai - 400 001. Mumbai - 400 051. Scrip Code – 532374 Scrip ID - STLTECH Sub.: Outcome of Board Meeting - Disclosure under Regulations 30 and other applicable provisions of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, as amended (the “Listing Regulations”) Dear Sir/ Madam, Pursuant to Regulation 30 of the Listing Regulations, we wish to inform you that the Board of Directors of Sterlite Technologies Limited (the “Company”), at its meeting held today i.e. September 3, 2026, has, inter alia, considered and approved the Capex/ capacity addition in the existing manufacturing facility of the Company in view of the demand for Optical Fiber Cables and connectivity business globally. The requisite disclosures, pursuant to Schedule III under Regulation 30 of the SEBI Listing Regulations read with SEBI Master Circular SEBI/HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026 are enclosed herewith in Annexure I. The meeting commenced at 3:00 pm and concluded at 3:50 pm. We request you to take the aforesaid on records. Thank you. Yours faithfully, For Sterlite Technologies Limited Mrunal Asawadekar Company Secretary & Compliance Officer Membership No.: A 24346 Sterlite Technologies Limited R egistered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408 www.stl.tech Annexure I Details with respect to Capacity Addition in existing manufacturing of the Company as per Regulation 30 of the SEBI Listing Regulations read with SEBI Master Circular SEBI/HO/49/14/14(7)2025-CFD- POD2/I/3762/2026 dated January 30, 2026. Sr. Particulars Description 1. Existing capacity Not disclosed considering the commercially sensitive and competitive nature of the information 2. Existing capacity utilization ~ 70% 3. Proposed capacity addition Approximately 50% increase over the existing installed manufacturing capacity. 4. Period within which the proposed capacity By end of FY29 is to be added 5. Investment required ~ ₹3,000 crores 6. Mode of financing Internal accruals and/or debt 7. Rationale To cater to anticipated growth in demand and strengthen the Company's manufacturing capabilities Sterlite Technologies Limited R egistered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408