Sumitomo Electric Industries, Ltd.

Company Profile



4-5-33, Kitahama, Chuo-ku, Osaka-shi, Osaka-hu, 541-0041, Japan

Business Overview

-Major manufacturer of wire harnesses.

-The Company operates the following five business sectors: automotive, information-communications, electronics, environmental energy, and industrial materials. From April 2018, the Company has been focusing its management resources in the connected sector under the mobility segment. In order to strengthen its development capabilities in areas such as automotive parts, ITS, and other products, the Company consolidated the automotive and the systems business, which was under the information-communications business. It set up a software strategy office within the automotive business sector.

-The automotive business deals in the following products: Wire harnesses, Automotive electric parts (the Company and Sumitomo Wiring Systems), Anti-vibration rubber, automotive hose (Sumitomo Riko).


-Listed on the first section of the Tokyo Stock Exchange, the Nagoya Stock Exchange, and the Fukuoka Stock Exchange. (As of Mar. 31, 2019)
Name or Company name Investment ratio (%)
The Master Trust Bank of Japan, Ltd. (Trust Account) 7.81
Japan Trustee Services Bank, Ltd. (Trust Account) 7.52
Nippon Life Insurance Co. 3.17
Sumitomo Life Insurance Co. 1.99
Japan Trustee Services Bank, Ltd. (Trust Account 5) 1.86
Japan Trustee Services Bank, Ltd. (Trust Account 4) 1.53
State Street Bank West Client - Treaty 505234 1.50
Total 30.93


Products for Electric Vehicles
-High-pressure underbody harnesses (Sumitomo Wiring Systems)
-High-voltage wires (Sumitomo Wiring Systems, Sumitomo Electric Industries)
-High-pressure connectors (Sumitomo Wiring Systems)
-Electric-device coils for drive motors (Sumitomo Electric Wintec)
-High-output/low-loss dust cores 「FM-CM」 (Sumitomo Electric Sintered Alloy)
-DC/DC convertors for regeneration (Sumitomo Wiring Systems)
-Rear torque for boost invertors equipped on HEVs (Sumitomo Wiring Systems)
-Silicon carbide power devices and wafers (Sumitomo Electric Industries, Power-device Department)
-Material for heatsinks (Allied Material)

Electric-vehicle systems and other systems
-Electric-vehicle charge/discharge connectors (Sumitomo Electric Industries, Electric-energy Division)
-Regular-charge connectors, inlets (Sumitomo Wiring)
-Voltage-detection modules (Sumitomo Wiring)
-Automotive tab-leads (Lithium-ion battery terminals) (Sumitomo Electric Industries)
-Metallic porous cellmet (Sumitomo Electric Toyama)
-Gaskets for fuel-cell stack-cells (Sumitomo Riko)
-Sub-harnesses for fuel-cell stacks (Sumitomo Wiring)

Lightweight, fuel-efficient, environmentally friendly products
-Aluminum-alloy wires for forging and cutting (Sumitomo Electric Toyama)
-High-strength aluminum harnesses (Sumitomo Wiring)
-Highly functional Sumi-Altough aluminum-alloy (Sumitomo Electric Sintered Alloy)
-High-strength oil-tempered wire (Sumitomo Electric Industries, Magnesium-alloy Development Department)
-Hose (Sumitomo Riko)
-Nickle-free, high-strength sintered material (Sumitomo Electric Sintered Alloy)
-cBN sintered body: Sumiboron, compound-diamond: Sumidia (Sumitomo Electric Industries Hard Metals)
-Ceramic-coated products (Nippon ITF)
-Oil-pump rotors (Sumitomo Electric Sintered Alloy )
-Magnesium alloy (Sumitomo Electric Industries, Magnesium-alloy Development Department)

Safety Systems
-High-level traffic-control systems(Sumitomo Electric System Solutions)
-Safe-driving assistance systems (Sumitomo Electric System Solutions, Sumitomo Wiring)
-Automotive light-beacon devices (Sumitomo wiring)
-EPB harness-shaped wheel-speed sensor (Sumitomo Wiring)
-Telematics systems (Sumitomo Electric System Solutions)

Safety Network Solutions
-Central gateway ECUs (Sumitomo Wiring)
-Antenna harnesses, high-frequency connectors (Sumitomo Wiring)
-Wire harnesses (Sumitomo Wiring)
- Electroluminescent tube tape (Sumitomo Electric Industries Fine Polymer)
-Transmission harnesses, connectors for devices, parts (Sumitomo Wiring)
-High-speed automotive LAN (Sumitomo Wiring, Auto Network Engineering and Research Center)
-Connectors for ECUs (Sumitomo Wiring)
-Waterproof conductors (Sumitomo Wiring)

Products for Enhancing Lifestyle and Comfort
-FPC (S-FPC (Sumitomo Electric Printed Circuits)
-Relay boxes (Sumitomo Wiring)
-Poreflon airheads (Sumitomo Electric Fine Polymer)
-Flat cables (Sumitomo Electric Industries Electronic Wire)
-Smart-entry system integrated BCM (Sumitomo Wiring)
-Harnesses for power sliding-doors (Sumitomo Wiring)
-Anti-vibration rubber (Sumitomo Riko)
-Engine covers, MIF, spacers (Sumitomo Riko)
-Steel wire for reinforcing tires (Sumitomo Electric Industries, Special Wire Department)


Apr. 1897 Sumitomo Headquarters acquired Nippon Copper Co., Ltd. and established Sumitomo Copper Rolling Works as a (direct management Company) to produce copper wires.
Mar. 1899 Acquired Osaka Copper Co., Ltd. and established the Sumitomo Copper Rolling Works Nakanoshima factory.
Apr. 1890 Started manufacturing insulated wires.
Oct. 1909 Started test development of telecommunications cables.
Aug. 1911 Separated wire manufacturing from Sumitomo Copper Rolling Works and set up the Sumitomo Electric Wire & Cable Works with capability to produce almost all kinds of electric cables.
Apr. 1916 Started production of enamel wires.
Dec. 1916 Built and moved operations to a new plant at the current Osaka plant site.
Dec. 1920 Separated from Sumitomo Headquarters and reorganized as Sumitomo Electric Wire & Cable Works (with capital of 10 million yen).
Oct. 1931 Invested in Tokai Electric Wire Co., Ltd.(currently named Sumitomo Wiring Systems, Ltd.)
Sep. 1932 Started manufacturing special-metal wires such as oxidation resistant nickel wires.
Oct. 1937 Invested in Tokai Rubber Industries, Ltd.
Nov. 1939 Adopted new corporate name, Sumitomo Electric Industries, Ltd. (current name).
Jan. 1943 Started manufacturing anti-vibration rubber and fuel tanks.
Nov. 1948 Started selling sintered products.
May 1949 Listed its stock on the Tokyo, Osaka, and Nagoya stock exchanges.
Jul. 1962 Located the home office to Chuo Ward (current location) in Osaka, from the Konohana Ward.
Jun. 1963 Started manufacturing disk brakes.
Jun. 1986 Established Sumitomo Electric Wiring Systems, Inc in the U.S.
Jan. 1993 Opened its Harima Research Laboratories.
Jul. 1999 Transferred the brake and ABS business to Sumitomo Denko Brake Systems Corp.
Jul. 2000 Acquired Lucas Sumitomo Brakes (LSB), which was a joint-venture with TRW in Ohio, USA, and made it into a wholly-owned subsidiary.
Nov. 2000 Established SEI Brake Systems Thailand, a manufacturer of disc brakes.
Mar. 2001 Established SEWS-CABIND S.p.A. (Cabind) in Italy jointly with Sumitomo Wiring Systems, Inc. and other companies to produce wire harnesses.
Mar. 2006

Acquired German auto wire-harness manufacturer (currently Sumitomo Electric Bordnetze GmbH).

Aug. 2007 Made Sumitomo Electric Wiring Systems, Inc. its wholly owned subsidiary.
Aug. 2009 In reorganizing its optics and electronic business divisions, launched Sumitomo Electric Device Innovations Inc.
2012 Established Sumiden Hyosung Steel Cord (Thailand) Co., Ltd., a joint venture with Hyosung Corporation, which is a major supplier of tire reinforcement material based in Korea; in Rayong Province.
Established "SUMI REMA EV Solutions GmbH", a joint venture with Sumitomo Wiring Systems and REMA, a charging-connector manufacturer based in Germany; to develop and design charging connectors for electric vehicles.

Supplemental Information 1