STL (NSE: STLTECH), a global provider of optical and digital infrastructure solutions, has released its financial results for the fiscal year ending 31 March 2025. The company reported consolidated revenue of ₹1,052 crore for Q4 FY25 and ₹3,996 crore for the full year, driven by performance across its Optical Networking and Digital businesses.
STL achieved an EBITDA of ₹146 crore for Q4, marking the highest in the last six quarters, with an EBITDA margin of 13.8%. The company attributed its performance to continued emphasis on customer-centric operations, product innovation, and disciplined cost management. Leveraging a global manufacturing presence in the United States, Europe, and India, STL remains positioned to address dynamic market conditions and contribute to large-scale digital infrastructure development.
The Optical Networking Business posted a 26% increase in revenue and a 110% increase in EBITDA in Q4 FY25 compared to Q4 FY24. This growth was supported by robust demand in the Enterprise Connectivity and Data Centre segments, particularly in Europe and India. The Optical Connectivity (OC) Business achieved an attach rate of approximately 22%, underlining strong integration with customer deployments.
STL Digital has delivered EBITDA-positive results for the second consecutive quarter, supported by steady year-on-year revenue growth and a robust order pipeline. The company has strengthened its market position by forming strategic alliances with over 40 technology partners and winning contracts from more than 25 global clients, with a primary focus on India and the United States.
As part of its business restructuring efforts, STL successfully completed the demerger of its Global Services Business from Sterlite Technologies Limited. The restructured entity now operates under STL Networks Limited and has been rebranded as ‘Invenia,’ marking a significant step in streamlining operations and enhancing focus on core service offerings.
STL also expanded its global footprint through new customer acquisitions and strategic collaborations across key international markets. Notable partnerships include Archtop Fiber in the United States, Connexin, Netomnia, and Wyre in the UK and Europe, Vocus in Australia, du Telecom in the Middle East and Africa, and BharatNet and Vedanta in India.
The company has maintained a strong emphasis on innovation, investing in advanced technologies and next-generation product development. Key breakthroughs included ultra-thin optical fibre variants (160-micron and 180-micron), high-capacity 864F Microcables, AI-powered data centre solutions, and cutting-edge products like Multi-Core Fibre (MCF) for quantum applications and silicon photonics. STL also introduced its Rapid series of optical products, designed to meet the Build America, Buy America (BABA) standards.
Financially, STL has significantly improved its capital structure. Following the business reorganisation and a successful qualified institutional placement (QIP), the company reported a Net Debt to Equity ratio of 0.68x, down from 1.39x the previous year. STL also ended the fiscal year with a total of 740 patents, including 76 new filings in FY25, further reinforcing its commitment to technological leadership.
Ankit Agarwal, Managing Director, commented “FY25 was characterised by operational resilience and a continued focus on customer and cost leadership. Strengthening order intake and expanding customer engagements reflect favourable shifts in industry demand. STL is strategically aligned to support three critical pillars of global digital transformation—AI-ready infrastructure, rural fibre deployment, and data centre expansion.”
Sterlite Technologies Ltd (STL) is a global leader in digital technology and network solutions, known for its expertise in designing and delivering integrated digital networks. Headquartered in India, STL operates in over 100 countries, providing cutting-edge solutions across the telecom, cloud, and data center industries.
The company’s portfolio includes fiber optic cables, network design, and deployment services, as well as software solutions for network management and cybersecurity. STL is also deeply invested in driving digital transformation through its innovative 5G, AI, and IoT-enabled technologies. With a strong commitment to sustainability, STL is leading initiatives to build future-ready digital infrastructures while reducing environmental impact.
