Niterra Co., Ltd. (Formerly NGK Spark Plug Co., Ltd.)

Company Profile



URBANNET NAGOYA NEXTA Bldg. 1-1-1 Higashisakura, Higashi-ku, Nagoya Aichi 461-0005, Japan

Business Overview

-The largest manufacturer of spark plugs in the world.

-It operates in three business segments: automotive, ceramic, and new-businesses. The automotive business accounted for 78.6% of companywide sales as of March 31, 2023.

-The Company's automotive business manufactures spark plugs, glow plugs, automotive sensors.


-Listed on the Prime Market of the Tokyo Stock Exchange, and the Premium Market of the Nagoya Stock Exchange. (As of Mar. 31, 2023)
Name or Company Name Investment Ratio (%)
The Master Trust Bank of Japan, Ltd. (Trust Account) 12.94
Meiji Yusuda Life Insurance Company 8.23
The Dai-ichi Life Insurance Company, Limited 8.21
Custody Bank of Japan, Ltd. (Trust Account) 3.55
National Mutual Insurance Federation of Agricultural Cooperatives 2.64
Nippon Life Insurance Co. 1.74
TOTO Co., Ltd. 1.68
The Nomura Trust and Banking Co., Ltd. (Investment Trust Account) 1.42
NTK Business Partners Shareholdings Association 1.37
JPMorgan Securities Japan Co., Ltd. 1.20
Total 43.03


Spark Plugs
-Iridium plugs
-Single iridium plugs
-Highly ignitable iridium plugs 
-Three-pole iridium plugs
-Platinum plugs
-Compact-size long-reach plugs
-M10 high-performance spark plugs
-Register plugs
-Green plugs
-Protrusion-type plugs
-Metal fitting protrusion-type plugs
-Multi-polar plugs
-Multi-polar semi-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

  • Metal glow plugs for MAQGS
  • SRM glow plugs
  • QGS-shaped glow plugs (2 materials)
  • QGS-shaped glow plugs (1 material)
  • Fast-heating glow plugs
  • Basic automotive sparkplugs

-Start-assist systems


-Zirconia exhaust gas oxygen sensors

  • OZAS-S2(Sensors for air-fuel -ratio control)
  • OZAS-S1
  • ZFAS-S4(Small heated type)
  • OZAS-S5(Small non-heated type)

-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.
Apr. 2023 Changed English name from NGK Spark Plug Co., Ltd. to Nittera Co., Ltd.

Supplemental Information 1