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.

-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).


--From April 2022, moved to the Prime Market of the Tokyo Stock Exchange and to the Premium Market of the Nagoya Stock Exchange, in addition to be listed on the Fukuoka Stock Exchange. (As of Mar. 31, 2022)
Name or Company name Investment ratio (%)
The Master Trust Bank of Japan, Ltd. (Trust Account) 17.51
Custody Bank of Japan, Ltd. (Trust Account) 7.97
Nippon Life Insurance Co. 3.17
Sumitomo Life Insurance Co. 1.99
The Master Trust Bank of Japan, Ltd. (Trust Account J) 1.61
Kochi Shinkin Bank 1.42
Custody Bank of Japan, Ltd. (Trust Account 4) 1.24
Total 39.33


Wiring harnesses and electrical components
-Automotive wiring harnesses
-Electronics products
-Products for EVs, HEVs, and PHEVs
-Harness components
>>>Click to see images of the Company’s products

Steel cords for tire reinforcement
-Steel cords for tire reinforcement
-Bead wires

Steel wires for springs
-Oil-tempered wires
-Piano wires
-Hard steel wires
-Deformed wires

Wiring materials
-Insulated electronic wires
-Coaxial cables
-Electronic wires for automobiles and devices
-Electronic wires for mobile communication devices
-Flat components
-Thunberbolt Cable
-Flexible printed circuits

Optical lenses for infrared devices
-Teralink T (tranparent, heat-resistant grade)

Abrasion-resistant parts/materials
-Teralink S (sliding grade)
-FEX (cross-linked fluoroplastics)
-Ganpla (parts material)

Heat shrink tubing & Heat-resistant tubing/tapes

Magnet wires

Aluminum materials
-Aluminum bars and wires
-Electronic lead wires

Sintered ZnS lenses

Products for electronic devices
-Tungsten and molybdenum powders, and various powders of carbides and nitrides: for various alloys and target materials
-Tungsten and molybdenum crucibles: for pulling monocrystalline sapphire
-Tungsten wires/electrodes:for discharge lamps and other lamps
-Metallic heat-radiating substrate materials (copper tungsten, copper molybdenum) 
-Ceramic heat-radiating substrate material (aluminum nitride, AL-SiC)
-Diamond heat-radiating materials (monocrystals, CVD, copper diamonds)

Sintered parts
-Sumi Altough (high performance aluminum alloy)


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.
Apr. 2022 Moved from the First Section of the Tokyo Stock Exchange to the Prime Market in line with the TSE’s reorganization.

Supplemental Information 1