Company Profile



14-18 Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi-ken, 467-8525, Japan

Business Overview

-The Company conducts business operations in two areas: the automotive business and the technical ceramics business (semiconductors, ceramics).

-The Company's automotive business manufactures spark plugs, glow plugs, automotive sensors, and ceramic engine parts.


Focusing on New Products in the CASE Segments

Conducting Self-driving Tests
-Several media sources in South Korea reported that A.I. Matics Inc. (A.I. Matics) has completed the first test run of its level-4 autonomous driving urban vehicle. The car is being developed by A.I. Matics and NGK Spark Plug Co., Ltd. (NGK). The two companies are planning to test the vehicle several more times by the end of 2020. The recent test confirmed A.I. Matics’ artificial intelligence (AI)-based autonomous driving image recognition algorithm technology which could recognize on-road stop signs and stop the autonomous driving vehicle. A.I. Matics was founded in 2003 as an in-house venture by researchers of Hyundai Motor Co. Ltd. (Hyundai). It started to deliver advanced driver assistance system (ADAS) products to Hyundai and Kia Motors Corporation in 2006. (From some releases on May 27, 2020)

-South Korea's PLK Technology (PLK) has reached an agreement with Japan's NGK Spark Plug Co., Ltd. Under the new contract, PLK will acquire 5% shares in NGK and launch a joint development of level-4 autonomous driving vehicles. NGK intends to expand its business into new areas such as camera sensors, AI image recognition, and connected cars. For that purpose, the company will invest in and offer support to PLK continuously. In particular, the two companies are going to supply PLK's autonomous driving platforms and deep-learning image recognition solutions to the automotive industry through NGK's customer network. PLK is owned 5.7% by Hyundai Motor Group. It supplies ADAS systems for 17 Hyundai/Kia models. Recently, it has developed technologies for level-3 autonomous driving (conditional autonomous driving). Currently, the company is trying to commercialize level-4 equivalent integrated solutions for autonomous driving in urban areas and advance deep-learning image recognition technologies. Meanwhile, PLK plans to start supplying proprietary solutions to the fleet management system market in the U.S. by the end of 2019. (From some releases on September 25, 2019)

5G Millimeter Wave Antenna Module
-NGK Spark Plug Co., Ltd. announced that it has tested an antenna module for a 5G mobile communications system millimeter-wave range it is developing for base stations and mobile terminals and verified that the antenna module is capable of data communications at a frequency of 28-GHz. The company integrated a millimeter wave-compatible circuit and an antenna into a module by applying multilayer substrate technologies it has accumulated for the manufacture of packages for semiconductors. The antenna module is made of a material developed by NGK Spark Plug to enable a reduction in transmission loss. The material offers excellent high-frequency performance necessary for the millimeter-wave range, as well as environmental resistance and heat-dissipation performance. (From an article in the Nikkan Jidosha Shimbun on April 8, 2020)

Established Joint-venture Fuel-cell-Battery Stack Manufacturer, with Mitsubishi Hitachi Power Systems
-On July 5 NGK Spark Plug Co., Ltd. (NGK Spark Plug) and Mitsubishi Hitachi Power Systems, Ltd. (MHPS) announced that they have agreed to establish a joint venture to manufacture and sell cylindrical cell (single cell) stacks for fuel cells on October 1, 2019. The fuel cells to be manufactured will be sold for industrial and business use. The joint venture will be set up with a capital of JPY 300 million after the review of the anti-trust law authority. It will be located in Komaki Plant of NGK Spark Plug in Komaki City, Aichi Prefecture, central Japan. The investment ratio is 70% for NGK Spark Plug and 30% for MHPS. The name of the JV and its representative are yet to be determined. NGK Spark Plug and MHPS concluded a business partnership agreement in June 2014 for the development of cylindrical cell stacks for solid oxide fuel cells (SOFC) that generate electricity using reformed town gas or other sources. Cylindrical fuel stacks are structures of elements on the outer surface of a ceramic substrate tube, which produce a power-generating reaction. The elements are serially connected by a conductive ceramic interconnector, allowing for efficient generation of low current, high voltage electricity. (From an article in the Nikkan Jidosha Shimbun on July 8, 2019)


-Listed on the first section of the Tokyo Stock Exchange and Nagoya Stock Exchange. (As of Mar. 31, 2020)
Name or Company Name Investment Ratio (%)
Meiji Yusuda Life Insurance Company 8.23
The Dai-ichi Life Insurance Company, Limited 8.21
The Master Trust Bank of Japan, Ltd. (Trust Account) 7.99
Japan Trustee Services Bank, Ltd. (Trust Account) 3.99
National Mutual Insurance Federation of Agricultural Cooperatives 3.90
MUFG Bank, Ltd. 2.14
The Nomura Trust and Banking Co., Ltd. (Trust Account) 2.02
The Master Trust Bank of Japan, Ltd. Toyota Motor Account 1.92
Japan Trustee Services Bank, Ltd. (Trust Account) 1.79
Nippon Life Insurance Co. 1.74
Total 41.99


Spark Plugs
-Iridium plugs
-Single iridium plugs
-Highly ignitable iridium plugs - angular chip type
-Highly ignitable iridium plugs - DFE type
-Three-pole iridium plugs
-Platinum plugs
-Compact-size long-reach plugs
-Register plugs
-Green plugs
-Protrusion-type plugs
-Metal fitting protrusion-type plugs
-Multi-polar plugs
-Multi-polar semi-creeping discharge plugs
-Creeping discharge plugs
-Plugs with an auxiliary spark gap
-Plugs for rotary engines
-Compact plugs

Glow Plugs
-Ceramic type glow plugs

  • NHTC2 glow plugs
  • Direct current NHTC glow plugs
  • Rapid-temperature-rise NHTC glow plugs
  • HTC glow plugs
  • SRC global plugs

-Metal type glow plugs
-Start-assist systems


-Zirconia exhaust gas oxygen sensors

  • OZAS-S2(Sensors for air-fuel -ratio control)
  • OZAS-S1

-Universal A/F ratio sensors

  • ZFAS-U2
  • ASICS FOR ZFAS-U2 (Basic control circuits)
  • ZFAS-U2-SM (Type with internal, control-circuit connector)

-NOx sensors
-Temperature sensors

  • Wide range exhaust gas temperature sensors

-Knock sensors

  • Non-resonant knock sensors


Semiconductor Packages and Substrates


Oct. 1936 NGK Spark Plug Co., Ltd. was established with capital of 1 million yen.
May, 1949 Started production of new ceramics.
May, 1949 Listed on Tokyo and Nagoya Stock Exchanges.
Sep. 1958 Launched wide range plugs with iron shafts as a pioneer in the automotive market.
Aug. 1959 Established a subsidiary in Brazil (Now Ceramica e Velas de Ignicao NGK do Brazil Ltda.)
Apr. 1962 Started operations of its Komaki factory (Aichi Prefecture), to which it transferred the operations of its New Ceramics Division of the headquarters plant.
Jun. 1966 Established NGK Spark Plugs (U.S.A.), Inc. (sales company)
1966 Completed the construction of performance testing room for plugs.
Oct. 1967 Started manufacturing ceramics IC packages.
1970 Completed the construction of a R&D center at the headquarters.
1970 Completed the construction of Komaki Technology Center.
Apr. 1973 Started manufacturing automotive temperature sensors.
1973 Established NGK Spark Plugs Malaysia Berhad.
Apr. 1974 Miyakonojo factory (Kagoshima Prefecture) began operating.
1974 Established Siam NGK Spark Plug Co., Ltd.
1975 Established NGK Spark Plugs (U.K.) Ltd.
1976 Established NGK Spark Plug Mfg. (U.S.A.)
1977 Established P.T. NGK Busi Indonesia.
1978 Established NGK Spark Plugs (U.S.A.), Inc. (ceramic manufacturing company)
Nov. 1979 Established NGK Spark Plug (Germany) (Now NGK Spark Plug Europe GmbH)
1979 Established Bujias NGK del Ecuador Cia. Ltda.
1979 Established NGK Spark Plug Europe GmbH
1980 Established NGK Spark Plug (Australia) Pty., Ltd.
1980 Merged NGK Spark Plug Mfg. Inc. (U.S.A.) into NGK Spark Plugs (U.S.A.), Inc.
Jun. 1982 Started manufacturing automotive oxygen sensors.
Sep. 1982 Established Kamioka Ceramics Co., Ltd.
1982 Established NGK Spark Plugs Canada Ltd.
1984 Established NGK Spark Plug MFG. (U.S.A.), lnc. (a joint venture for sales, manufacturing)
May, 1984 Established Kaji Ceramics Co., Ltd.
Oct. 1984 Established Takenami Ceramics Co., Ltd.
Nov. 1984 Established Iiima Ceramics Co., ltd.
1984 Established NGK Spark Plugs U.S.A. (Sales and manufacturing)
1984 Established Taiwan NGK Spark Plug Co., Ltd.
Dec. 1989 Established Ceramic Sensor Co., Ltd.
1989 Injected capital in Woo Jin Industry Co., Ltd. (Korea)
Oct. 1990 Established NGK Spark Plug Industries Europe S.A.
1990 Began the operation of NGK Spark Plug Europe Technical Center.
1992 Established Bujias NGK de Mexico S.A. de C.V.
Jul. 1993 Established Nakatsugawa Ceramic Co., Ltd. (in Japan)
1993 Established NGK Spark Plugs (France) S.A.
1993 NTK Cutting Tools Korea Co., Ltd.
Apr. 1994 Began the operation of Ise Factory. (in Japan)
Apr. 1994 Established NGK Spark Plug MFG. (U.S.A.) ,Inc.
1994 Established NTK Technical Ceramic H.K. Ltd.
1994 Established NTK Technical Ceramics (Taiwan) Ltd.
Aug. 1995 Established NGK Spark Plugs (U.S.A.) Holding, lnc.
1996 Completed construction of USA Technical Center
1997 Completed construction of Komaki Technical Center (in Japan)
Jun. 1998 Started mass production of plastic IC packages
Apr. 2001 Started mass production of oxygen compressors for medical use
Jan. 2002 Established NGK Spark Plug (U.S.A.), Inc. and NTK Technology, Inc. restructuring NGK Spark Plug (U.S.A.) and NGK Spark Plug MFG. (U.S.A.), lnc. according to product market.
Apr. 2003 Established Shanghai NGK Spark Plug Co., Ltd.
May. 2003 Established NGK Poland Co., Ltd.
Oct. 2004 Started mass production of ceramic glow plugs having properties enabling them to rapidly rise in temperature.
Aug. 2006 Established NGK Spark Plugs (India) Pvt. Ltd.
Jan. 2007 Established NGK Spark Plugs SA (Pty) Ltd.
Sep. 2007 Made Ceramic Sensor Co., Ltd., based in Aichi prefecture, its wholly owned subsidiary by acquiring additional shares.
Oct. 2009 Nakatsugawa Ceramic Co., Ltd. changed its corporate name to NTK Ceramic Co., Ltd. after merging with both Iijima Ceramic Co., Ltd. and Kani Ceramic Co., Ltd., and subsequently absorbing the ceramic IC package division of NGK Spark Plug.
Sep. 2010 Merged NGK Spark Plugs (France) S.A.S. and NSK Spark Plug Industries Europe S.A.S., with NGK Spark Plugs (France) as a surviving company. 
Sep. 2011 Established NGK Spark Plug (Changshu) Co., Ltd.
May 2012 Established NGK Spark Plugs (Vietnam) Co., Ltd.
May 2013 Established LLC NGK Spark Plugs (Eurasia)
Jun. 2013 Established Nittoku Denshi Co., Ltd.
Jul. 2013 Established SparkTec (Thailand) Co., Ltd.
Apr. 2014 SparkTec Tono Co., Ltd. commenced the operation of Nino Plant.
Mar. 2015 Announced to acquire all shares in Nihon Ceratec Co., Ltd. to reinforce its competitiveness in semiconductor businesses.
Jul. 2015 Made UCI Acquisition Holdings (No.2) Corp. (Now, Wells Vehicle Electronics Holdings Corp.) in U.S., its wholly owned subsidiary by acquiring additional shares.
Oct. 2015 Established NGK Spark Plug (Shanghai) Co., Ltd. in China
Feb. 2016 The name of Nittoku Seisakusyo Co., Ltd. was changed to Nittoku SparktTec WKS Co., Ltd.
Jul. 2016 Established Ceramic Sensor Nakatsugawa
Apr. 2018 Launched sales of the NGK Compact Emissions Meter (NCEM) for the development and evaluation of auto bodies and for market research on exhaust gas.

Supplemental Information 1