Press Release

www.stl.tech September 10, 2026 National Stock Exchange of India Limited BSE Limited Exchange Plaza, 5th Floor, Phiroze Jeejeebhoy Towers, Plot No. C-1, G Block, 25th Floor, Dalal Street, Fort, Bandra Kurla Complex, Bandra (East) Mumbai – 400001 Mumbai – 400051 Scrip ID - STLTECH Scrip Code - 532374 Sub: - Press Release – Sterlite Technologies Limited (‘STL’) launches Plenum-rated Fiber Trunk Assemblies for AI Data Center Connectivity. Ref.: Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 Dear Sir/Madam, Sterlite Technologies Limited today announced an update to its data center portfolio with Optical Fiber Nonconductive Plenum (OFNP) US certification for 48 to 576F Intermittently Bonded Ribbon (IBR) pre-terminated assembly portfolio. With this certification, STL is now among the global AI ready infrastructure providers for NFPA 262-qualified indoor cable assemblies. A copy of the press release in this regard is enclosed herewith. Kindly take the above on record. Thank you. Yours faithfully, For Sterlite Technologies Limited Mrunal Asawadekar Company Secretary & Compliance Officer Membership No.: A 24346 Enclosure: As above 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 PRESS RELEASE STL launches Plenum-rated Fiber Trunk Assemblies for AI Data Center Connectivity  Secures NFPA 262 Compliance for Intermittently Bonded Ribbon (IBR) Portfolio  Fire Protection for the next-generation AI Data Center Overhead and Underfloor Pathways South Carolina, 10/September/2026: STL [NSE: STLTECH], a leading connectivity solutions provider for AI-ready digital infrastructure, today announced an update to its data center portfolio with Optical Fiber Nonconductive Plenum (OFNP) US certification for 48 to 576F Intermittently Bonded Ribbon (IBR) pre-terminated assembly portfolio. These factory-built cable assemblies are critical to support the AI-led Data Center market requirements with connectors installed, polished, and tested for high performance, preventing the need for field splicing and equipment resulting in fast installation and lowered cost. With this certification, STL is now among the global AI ready infrastructure providers for NFPA 262-qualified indoor cable assemblies. The Plenum certified cable assembly portfolio is purpose-built for indoor applications, targeting specialised deployment inside hyperscale, colocation, and enterprise data center containment zones. Optimised for tight routing environments, these cables enable operators to scale bandwidth within restricted duct spaces without compromising safety compliance. "As AI workloads push the boundaries of data center design, the physical layer must evolve to meet unprecedented density and safety demands," said Dr. Badri Gomatam, CTO, Optical Networking Business, STL. “Achieving this plenum certification for our indoor IBR cable family is a testament to STL's engineering excellence and our commitment to being the partner of choice for the world's largest hyperscalers. We are proud to deliver solutions that not only power the AI revolution but do so with the highest standards of safety and reliability." About STL - Sterlite Technologies Ltd: STL is a global leader in advanced connectivity solutions, providing end-to-end solutions for building AI-ready infrastructure, FTTx, Rural, Enterprise and Data Center networks. With manufacturing facilities in North America, Europe and Asia, we deliver our solutions in more than 100 countries. Data Center & Cloud companies, Telecom operators, Internet service providers and Large enterprises collaborate with STL to build their future-ready digital infrastructure. STL’s business goals are driven by customer-centricity, R&D and sustainability. Read more, Contact us, stl.tech | Twitter | LinkedIn| YouTube For more information, contact: Media Relations Investor Relations Shaily Rai Sinha Rahul Darak Phone: +91 22 30450450 Phone: +91 22 30514000 +1 (803)-403-2258 investor@stl.tech stl.communications@stl.tech Sterlite Technologies Limited R egistered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408