Materiality (Key Issues)
As materialities, SUMCO identifies those issues it will address on a priority basis to solve social issues and enhance corporate value in a sustainable manner while responding to demands from stakeholders. SUMCO engages in ESG activities to achieve the materiality targets.
The Materiality Identification Process
STEP
01
We take stock of the ESG issues currently being worked on and check their consistency with the GRI standards.
STEP
02
We set the order of priority based on the degrees of importance both to SUMCO and its stakeholders, and create a list of candidate materialities.
STEP
03
We verify the relevance between the issues and the , and CSR Policy, which represent the sources of the corporate value, and identify the materiality issues
STEP
04
The Board of Directors deliberates and approves the materiality issues.
SUMCO Materiality
Combatting global warming
| Material Issue Themes | Reasons for Identification | Targets | Initiatives and Achievements in 2025 |
|---|---|---|---|
| Net Zero | To enhance our initiatives preventing global warming, we established and address new targets aimed at achieving Net Zero. | By 2030, reduce GHG emissions (Scope 1+2:domestic and overseas) by 42% compared with 2030 levels (6.0% annual reduction); and by 2050, reduce by 100% (Net Zero) | A 12.0% reduction (from 2023 levels) was achieved in fiscal 2025, exceeding the 12.0% target for that year. |
Resource conservation activities
| Material Issue Themes | Reasons for Identification | Targets | Initiatives and Achievements in 2025 |
|---|---|---|---|
| Effective utilization of water resources | To ensure that our precious global environment is passed on to the future generation, the SUMCO Group has developed an environmental management system and obtained ISO 14001 certification for all of its plants. We also conduct environmentally friendly production activities including the prevention of global warming, the effective utilization of water resources and the recycling of wastes. |
High and stable water recycling rate | A water recycling rate was maintained at the level in previous years of 38.9%. |
Contributing to the creation of a recycling-oriented society
| Material Issue Themes | Reasons for Identification | Targets | Initiatives and Achievements in 2025 |
|---|---|---|---|
| Waste management | To ensure that our precious global environment is passed on to the future generation, the SUMCO Group has developed an environmental management system and obtained ISO 14001 certification for all of its plants. We also conduct environmentally friendly production activities including the prevention of global warming, the effective utilization of water resources and the recycling of wastes. |
Conversion of waste into valuable resources and improved recycling rate | The recycling rate of industrial waste was 82.5%, slightly increase from the level in the last year. |
Enhancing risk management
| Material Issue Themes | Reasons for Identification | Targets | Initiatives and Achievements in 2025 |
|---|---|---|---|
| Initiatives to develop BCP | The silicon wafer business is a critical industry supporting an IT-based society, and the SUMCO Group is responsible for ensuring the stable supply of silicon wafers to the world's semiconductor device manufacturers. The Business Security Committee (BSC), which is an organization responsible for risk management, promotes risk management activities while working to improve business continuity and the ability to respond in an emergency through periodic training. |
Implementing BCP training | Again in 2025, we worked on further developing BCP based on the findings in the previous year by the Business Security Committee (BSC). We also held drills to prepare for the loss of headquarter functions in the event of an earthquake directly under Tokyo, as well as conducting comprehensive disaster prevention drills and BCP drills at each plant to prepare for accidents. |
Promoting compliance
| Material Issue Themes | Reasons for Identification | Targets | Initiatives and Achievements in 2025 |
|---|---|---|---|
| Ongoing enhancement of compliance awareness | Ensuring compliance with laws, regulations and social norms to be observed forms the basis for SUMCO fulfilling its social responsibilities and is also essential for the sustainable growth of corporate value. Training on topics including the SUMCO Charter of Corporate Conduct, which prescribes the norms to be observed by employees, is conducted regularly for all employees as part of ongoing efforts to strengthen awareness of compliance. |
Implementing compliance education | Again in 2025, we conducted training for all employees on the SUMCO Charter of Corporate Conduct, by e-learning and other means. |
Executive Officer Message
Materiality (Key Issues)
The SUMCO Group's Business Activities and the Sustainable Development Goals (SDGs)
Related Policies
CSR and Sustainability Promotion Structure
SUMCO Vision
Site Data
Environmental
Social
Governance
To ESG-oriented Investors
Disclosure Based on TCFD Recommendations
Sustainability Report / CSR Report
Health, hygiene and safety initiatives
Aware that the good health of employees is a key management resource, we took initiatives toward maintaining and promoting health and improving the working environment.
Human resources development
We will enhance training opportunities with a multi-faceted approach that covers everyone from new employees to managers and officers.
We sought to make training more effective, with online training as the norm.
Promotion of women’s active participation
We will enhance our initiatives to create a more favorable working environment for women.
Besides enhancing diverse working arrangements that support women’s active participation, we actively promoted mid-career hiring of women.
R&D and technological capabilities supporting customer value creation
Moreover, we will contribute to the achievement of the SDGs by supporting advances in semiconductors.
We maintained our top supplier position, winning customer recognition as a development partner for our high technology development capability and consistent quality.
By quickly providing customers with the products that meet their needs while continuing with performance checks and follow-ups, we build robust relationships of trust.
We analyze the information customers provide through QCDS (quality, cost, delivery and service) evaluations, share the insights with management and relevant departments, direct what we have learned into improvement activities and strive to improve customer satisfaction levels.
By sharing the supplier evaluations throughout the Group and reflecting them in improvement activities in each division, we won high ratings from customers in quality and technology.
Promoting CSR procurement and mitigating procurement risks
We share the SUMCO CSR Procurement Policy with suppliers through briefing sessions, audits and other activities, and promote responsible procurement activities.
SUMCO secures appropriate levels of inventory in line with risks, pursues advance preparations such as ensuring multiple procurement sources under normal circumstances, and has established the necessary systems to minimize the impacts on production in the event of a disaster or accident.
In addition, we held supplier safety education sessions, for each of the plants.
Communication with shareholders and investors
We proactively disclose any information that is beneficial to investment decisions, such as medium-to-long-term demand forecasts for the silicon wafer market based on end product demand forecasts.