Protecting and Restoring Biodiversity

The NGK Group provides information disclosure on its nature conservation activities and continuously conducts environmental education and awareness-raising activities for employees. In October 2025, we held an internal event, “NGK-Days,” where we organized a workshop on biodiversity.
On the day, employees observed the vegetation around our headquarters together with experts. Through this activity, they learned about the relationship between our business, the local community, and nature. We also promoted a deeper understanding of the importance of biodiversity conservation and the underlying concepts among employees.

Based on the recognition that biodiversity conservation requires a solid foundation, the NGK Group conducts biological surveys of local ecosystems at its company-owned land and business sites. We have conducted surveys of plants, animals, birds, and insects at multiple sites and identified a wide range of species. The results confirmed that no invasive species requiring immediate action were found and that these sites are being properly managed. We also summarize the survey results on display panels at welfare facilities to raise awareness of the importance of biodiversity conservation among employees and other stakeholders, including local communities.
In FY2025, following a survey conducted in the previous year in the Shinbori River near our headquarters, we carried out a biological survey in the Ooyama River, which flows near the Komaki Plant, using environmental DNA analysis. Because we discharge treated water into the Ooyama River, we consider it important first to understand the current state of local biodiversity. We are examining how the survey results can be used to deepen our understanding of local ecosystems and contribute to biodiversity conservation. Going forward, we plan to expand the use of environmental DNA analysis to other sites.

FY2025 Survey Overview

• Date: October 2025
• Location: Ooyama River near the NGK Komaki Plant
• Survey contractor: Sunlit Seedlings Co., Ltd.

The NGK Group conducts social contribution activities at its sites in Japan and overseas, working in collaboration with local governments, NPOs, and companies. Through these activities, we aim to contribute to local environmental conservation, protect biodiversity, and raise environmental awareness among employees.

NGK Filtech supports the “Kanagawa Forest Restoration 50-Year Plan” and carried out forest conservation activities at the Yadoriki Water Source Forest in Matsuda Town, Kanagawa Prefecture. Employees and their family members participated in the activity and learned about the importance of forest conservation through biodiversity observation and explanations of plant species.
Since September 2022, the company has entered into a five-year agreement with Kanagawa Prefecture and has been supporting forest maintenance costs as a “Forest Restoration Partner.”

NGK has been conducting a pilot greening initiative since FY2024 by utilizing a former parking lot at its headquarters. Through this initiative, we aim to contribute to the restoration of biodiversity in the regions where we operate by planting seedlings of native species.
In November 2025, we carried out mowing of cogongrass grassland and planted wild plant seedlings. We also created opportunities to introduce this initiative to employees on-site and used it as part of environmental education to raise environmental awareness.

NGK Minnano Mori Mizunami, a company-owned forest in Mizunami City, Gifu Prefecture, is certified by the Ministry of the Environment as a site for harmony with nature and is registered as an OECM, which is counted toward the international target of conserving at least 30% of land and sea areas as healthy ecosystems by 2030.
Located near NGK Ceramic Device Tajimi Plant, NGK ADREC, and Akechi Insulators, the forest is managed to enhance ecosystem health. The NGK Group is promoting initiatives to conserve and restore regional biodiversity and contribute to achieving a nature-positive society through appropriate forest management.
In FY2025, employees who support the initiative took the lead in conducting continuous satoyama conservation activities, such as undergrowth clearing and thinning, using the Company’s internal “voluntary theme circle” program.

NGK Minnano Mori Mizunami, a company-owned forest located near Group companies’ facilities, was certified by the Ministry of the Environment as a Nationally Certified Sustainably Managed Natural Site in March 2024.
A Nationally Certified Sustainably Managed Natural Site is an area certified by the government where biodiversity conservation is being achieved through private-sector initiatives.

NGK was certified as an “Aichi Biodiversity Certified Company” by Aichi Prefecture in November 2023.
This certification recognizes companies that implement outstanding initiatives for biodiversity conservation and aims to promote conservation activities in local communities.

The NGK Group endorsed the Keidanren Initiative for Biodiversity Conservation in 2022.
This declaration outlines the commitment and action guidelines for companies and organizations to promote biodiversity conservation.