Motherson Sumi Wiring India is India’s largest listed maker of wiring harnesses - the nervous system of a vehicle, the bundled cables and connectors that carry power and data to every light, sensor, and screen. The company was born in 2022 when its parent, Samvardhana Motherson International, carved out its domestic wiring harness business into a separate listed entity, fulfilling a long-standing wish of joint-venture partner Sumitomo Wiring Systems of Japan to keep its India participation focused on its core craft. Everything the company does follows a single, self-contained logic: it does not chase market share or predict which fuel will win; it follows the customer, locates a plant next door, and works to be better than it was yesterday - a philosophy it calls ‘BYBY’ (By Yourself, Better Yourself). # Business segments A single engine - wiring harness solutions for every vehicle type on Indian roads - built on a 40-year technical partnership and a factory-next-door model that turns a complex, labour-intensive component into a just-in-time service. ## 1. Wiring harness solutions: the electrical backbone of the vehicle **The company designs and delivers the complete electrical distribution system for a vehicle - every wire, connector, and junction box - and earns more as cars get smarter, regardless of what powers the engine.** - **Full-system supplier, not a parts vendor** - it provides the entire wiring harness and electrical distribution system for a vehicle, from low-voltage bundles for conventional cars to high-voltage 400V and 800V harnesses for electric vehicles, plus the junction boxes and electronic control units that manage power and signals. - **Paid by the feature, not by the vehicle** - revenue rises when customers choose richer variants with more screens, cameras, and connectivity, because each added feature means more wiring content per car, directly increasing the company’s bill per vehicle. - **Powertrain-agnostic by design** - the same factory can build harnesses for petrol, diesel, electric, hybrid, and CNG vehicles, so the company does not need to bet on which technology wins; it supplies them all and shifts mix as the customer shifts. - **Design partner from day one** - it works alongside the carmaker from the 3D-design and prototyping stage through to full production, which locks in the specification early and makes the harness hard for a rival to displace later. - **Nine of the top ten cars carry its work** - in FY26, the company supplied nine out of the ten best-selling passenger-vehicle models in India, and in electric vehicles it was on two of the top three electric cars and two of the top five electric two-wheelers. # Manufacturing and supply-chain model **Thirty plants sit next to customer factories so that finished harnesses arrive exactly when the assembly line needs them - a logistics feat built on proximity, people, and parent-company sourcing.** - **Factory-next-door logistics** - all 30 plants are placed beside OEM assembly lines across 14 locations, enabling just-in-time and just-in-sequence delivery; the company follows customers to new regions and decides new-plant locations jointly with them. - **A workforce of 63,000 hands** - wiring harness assembly remains a human-intensive process relying on dexterity, so the company employs over 58,000 shop-floor associates alongside roughly 5,000 permanent staff, and runs a dedicated in-house training academy (MITR centres) to build skills. - **Copper passes through, not stockpiled** - the key raw material is copper, priced off the London Metal Exchange, and the company carries only two to three days of wire inventory because it procures from its parent SAMIL and has a pass-through arrangement with customers for copper-price changes. - **Vertical integration with the family** - wires, terminals, connectors, PVC tubes, and rubber components are sourced from SAMIL group companies, while child parts come through Sumitomo Wiring Systems, which often has preferential pricing with local vendors; this keeps procurement competitive without tying up capital in raw-material plants. - **Greenfield capacity ramping up** - new plants at Navagam (Gujarat), Pune (Maharashtra), and Kharkhoda (Haryana) are scaling with customer volumes; the Kharkhoda facility was showcased by Maruti Suzuki as a case study during its Quality Month in late 2025. # Group structure and partners **A debt-free joint venture between an Indian industrial group and a Japanese wiring-harness giant, listed separately so each partner could focus on what it does best.** - **Born from a 40-year partnership** - the original joint venture between Motherson and Sumitomo Wiring Systems (a wholly owned subsidiary of Sumitomo Electric Industries, Japan) was formed in 1986; the technical collaboration now spans over four decades. - **Demerged to sharpen focus** - the domestic wiring harness business was carved out of Samvardhana Motherson International and listed in March 2022 because Sumitomo Wiring Systems wanted its India participation concentrated on wiring harnesses alone, which is its core business. - **Two parents, clear roles** - SAMIL (33.43% stake) brings large-scale manufacturing expertise, supply-chain integration, and OEM relationships; SWS (25.34% stake) provides advanced engineering, R&D, and access to cutting-edge harness technology. - **Shared services, arm’s-length terms** - SAMIL and MSWIL share a central team for design, procurement engineering, and HR, with costs allocated between them; MSWIL pays royalty to SWS for technology and a management fee to SAMIL, and leases land and premises from SAMIL at independently valued rates. - **Debt-free since inception** - the company carries no debt, which it treats as a strategic asset that lets it invest behind customers without financial pressure.