Sumitomo Electric Wiring Systems, Inc. (SEWS) is the automotive wiring systems business of Sumitomo Electric Industries, headquartered in Osaka, Japan. SEWS is the world's largest manufacturer of automotive wiring harnesses by volume, supplying complete wiring harness assemblies, connectors, high-voltage cables, and optical fiber cables. Sumitomo Electric's automotive business generates approximately ¥2 trillion (~$13 billion) in revenues and employs over 200,000 people across 45+ countries. Key customers include Toyota, Honda, Nissan, Stellantis, GM, and Ford.
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