Sep. 02, 2025

Niterra Acquires DENSO's Spark Plug Business, etc.-No Immediate Impact on Rating; JCR Will Monitor Synergistic Effects and Impact on Earnings and Financials

Feb. 21, 2025

JCR Affirmed AA-/Stable and J-1+ on Niterra

Nov. 26, 2024

Niterra Acquires Toshiba Materials—JCR will Watch for Synergy Effects and Impact on Earnings and Financials

Jan. 22, 2024

JCR Affirmed AA-/Stable and J-1+ on Niterra

Jul. 11, 2023

Niterra Starts Discussions and Considerations Regarding Acquisition of DENSO’s Spark Plug and Other Businesses - JCR Will Watch for Progress of Discussions and Impact on Niterra’s Earnings and Financials

Feb. 28, 2023

JCR Assigned Preliminary AA- Rating to Shelf Registration of NGK SPARK PLUG

Dec. 29, 2022

JCR Affirmed AA-/Stable and J-1+ on NGK SPARK PLUG

Feb. 09, 2022

JCR Affirmed AA-/Stable and J-1+ on NGK SPARK PLUG

Jan. 19, 2021

JCR Affirmed AA-/Stable, AA- and J-1+ on NGK SPARK PLUG

Nov. 02, 2020

JCR Assigned J-1+ Rating to NGK SPARK PLUG

Dec. 26, 2019

JCR Affirmed AA-/Stable, AA- and Preliminary AA- on NGK SPARK PLUG

Jun. 14, 2019

JCR Assigned AA- Rating to Bonds of NGK SPARK PLUG

Apr. 18, 2019

JCR Assigned Preliminary AA- Rating to Shelf Registration of NGK SPARK PLUG

Dec. 26, 2018

JCR Upgraded Rating on NGK SPARK PLUG from A+/Positive to AA-/Stable

Jun. 08, 2018

JCR Assigned A+ Rating to Bonds of NGK SPARK PLUG

May. 25, 2018

JCR Assigned Preliminary A+ Rating to Shelf Registration of NGK SPARK PLUG

Dec. 27, 2017

JCR Affirmed A+/Positive and A+ on NGK SPARK PLUG

Dec. 27, 2016

JCR Affirmed A+/Positive on NGK SPARK PLUG

Jan. 26, 2016

JCR Affirmed A+ and Pre. A+ on NGK SPARK PLUG; Outlook Positive

Oct. 21, 2015

JCR Assigned A+ Rating to Bonds of NGK SPARK PLUG

Oct. 15, 2015

JCR Assigned Preliminary A+ Rating to Shelf Reg. of NGK SPARK PLUG

Jan. 14, 2015

JCR Affirmed A+/Stable Long-term Issuer Rating and A+ Rating on Bonds for NGK SPARK PLUG

Jan. 28, 2014

JCR Affirmed A+/Stable Long-term Issuer Rating and A+ Rating on Bonds for NGK Spark Plug

Sep. 04, 2013

JCR Assigned A+ Rating to Bonds of NGK Spark Plug

Jul. 30, 2013

JCR Assigned Preliminary A+ Rating to Shelf Reg. of NGK Spark Plug

Feb. 08, 2013

JCR Affirmed A+/Stable and A+ Rating on NGK Spark Plug

Jan. 20, 2012

JCR Affirmed A+/Stable on NGK Spark Plug

Jan. 28, 2011

Affirmed A+/Stable and A+ rating on NGK Spark Plug

Feb. 04, 2010

Affirmed A+ rating on NGK Spark Plug; Revised outlook to Stable

Feb. 04, 2010

Withdraws preliminary A+ rating on shelf of NGK Spark Plug