Sterlite Technologies Limited. — Capital/Financing Update 2026

Mar 25, 2026

www.stl.tech

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March 25, 2026

National Stock Exchange of India Limited

Exchange Plaza, 5[th] Floor, Plot No. C-1, G Block, Bandra Kurla Complex, Bandra (East) Mumbai – 4000517

BSE Limited Phirozee Jeejeebhoy Towers, Dalal Street, Mumbai – 400001

Scrip ID - STLTECH

Scrip Code - 532374

Sub: - Press Release – STL redefines Optical Connectivity with India’s first Hollow Core fibre cable for Data Centre networks

Dear Sir/Madam,

Sterlite Technologies Limited, a leading connectivity solutions provider for AI-ready digital infrastructure, today announced a significant breakthrough in optical communication with the launch of India’s first Hollow Core Fibre (HCF) cable. A copy of press release in this regard is enclosed herewith.

Kindly take the above on record.

Thanking you.

Yours faithfully,

For Sterlite Technologies Limited

MRUNAL Digitally signed by MRUNAL ASAWADE ASAWADEKAR Date: 2026.03.25 KAR 10:36:40 +05'30'

Mrunal Asawadekar

Company Secretary & Compliance Officer Membership No.: A 24346

Enclosure: As above

Sterlite Technologies Limited Registered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408

www.stl.tech

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PRESS RELEASE

STL redefines Optical Connectivity with India’s first Hollow Core fibre cable for Data Centre networks

Mumbai, 25/March/2026: STL [NSE: STLTECH], a leading connectivity solutions provider for AI-ready digital infrastructure, today announced a significant breakthrough in optical communication with the launch of India’s first Hollow Core Fibre (HCF) cable . This innovation, from STL’s industry-leading R&D engine, is designed to meet the low-latency and high-bandwidth requirements of modern Data Centres, Hyperscalers, and High-Frequency transmission networks.

As the first company to develop and manufacture HCF technology in India, STL continues to solidify its position as a global deep-tech leader. Traditional optical fibres carry light through a solid glass core, while STL's Hollow Core Fibre cable guides light through an air-filled core, enabling signals to travel ~46% faster , significantly reducing latency and signal loss.

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Recognising the diverse needs of next-generation networks, STL has engineered a unique Hybrid Cable architecture. This cable combines:

• Hollow Core Fibre: For ultra-low latency and high-power delivery.

• G.654.E Fibre: Optimised for ultra-low loss and large effective areas in long-haul transmissions.

• G.657.A1 NOVA: Ensuring versatility and broad network coverage.

This breakthrough underscores our STL’s commitment to the AI Data Centre market and our mission to power the next era of high-speed connectivity. With over 780 patents and a dedicated focus on "Glass-toTerabit" connectivity, STL continues to lead the way in sustainable, high-performance optical solutions.

Sterlite Technologies Limited Registered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408

www.stl.tech

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"Our R&D focus has always been on solving the most complex challenges of the future," said Dr Badri Gomatam, CTO, STL . "With the launch of Hollow Core Fibre cable , we are providing the 'speed-of-light' infrastructure required for the AI revolution. This is a defining moment that demonstrates our capability to innovate and empower hyperscalers and data centres on a global scale”.

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 Centre networks. With manufacturing facilities in North America, Europe and Asia, we deliver our solutions in more than 100 countries. Data Centre & 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 stl.communications@stl.tech investor@stl.tech

Sterlite Technologies Limited Registered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408