Top page News 2025 Notice Concerning the Completion of the Acquisition of Shares of Toshiba Materials Co., Ltd. News 2025 Jun 02, 2025 NGK SPARK PLUG CO.,LTD. Corporate Notice Concerning the Completion of the Acquisition of Shares of Toshiba Materials Co., Ltd. News 2025 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 and before