Producer
Sumitomo Electric Industries (Winding Wire Division)
Sumitomo Electric Industries, Ltd. (Osaka, Japan; TSE: 5802; ~¥3.5T revenue) is one of the world's largest wire and cable companies; its Winding Wire Division is a top-three global magnet wire manufacturer with an estimated 15-18% global market share. Produces enameled copper magnet wire (round and rectangular) at facilities in Japan (Itami, Hyogo Prefecture and Osaka), the Americas, and Asia. Major supplier to Japanese motor OEMs (Toyota, Honda, Mitsubishi Electric) and transformer manufacturers globally. Sumitomo Electric also produces superconducting wire, optical fiber, and automotive wiring harnesses — same company that makes motor windings also dominates automotive wiring harnesses and hybrid/EV cable systems.
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Winding Wire (Magnet Wire)
18%Automotive Wiring Harnesses
30%Optical Fiber & Telecom Cable
22%Superconducting Wire & Advanced
10%Electronics & Other Wire
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Origin2023
Sumitomo Electric Industries traces its wire operations directly to the Besshi Copper Mine in Niihama, Ehime Prefecture — a mine the Sumitomo family opened in 1691 during the Edo period and operated continuously for 282 years until its exhaustion in 1973. The Besshi mine was one of the richest copper deposits in Japan; Sumitomo's copper smelting expertise accumulated over centuries of operating it became the foundation for modern wire manufacturing. Sumitomo Copper Wire Manufacturing Co. was established in 1897 as Japan industrialized during the Meiji era, drawing directly on Sumitomo's copper supply chain. The company that now dominates automotive wiring harnesses for Toyota and Honda, makes MRI superconducting magnets, and supplies magnet wire to transformer manufacturers worldwide grew from a 17th-century Edo-era copper mine that has been exhausted and converted into a tourist heritage site. The Besshi Mine is now a UNESCO-listed industrial heritage landmark; its 282 years of copper output underpins Sumitomo Electric's ¥3.5 trillion wire business.
Sumitomo Electric Industries, Ltd. ↗Did you know2023
Sumitomo Electric Industries' Winding Wire Division is the same business unit that supplies superconducting wire for fusion research reactors and MRI machines — the company makes conventional enameled magnet wire for motors AND high-temperature superconducting (HTS) wire for ITER fusion reactor magnets and next-generation electric aircraft propulsion. This means Sumitomo Electric's winding wire engineers work across the full temperature spectrum from room-temperature motor windings (up to 220°C class) to superconducting applications operating at near absolute zero (-269°C). No other company in the world has this dual capability at commercial scale. Sumitomo Electric's HTS wire business positions it at the center of both conventional electric motor supply chains and the emerging superconducting motor technology for aviation electrification — same company, same division.
Sumitomo Electric Industries ↗