Understanding the organizational context, gradually implementing IFRS Sustainability Disclosure Standards, and adopting the double materiality principle as the method for assessing sustainability impacts
In 2025, WT began the implementation of the IFRS Sustainability Disclosure Standards. For the first time, the concept of double materiality was incorporated as the method for assessing sustainability impacts. Double materiality comprises impact materiality and financial materiality. By comprehensively considering sustainability reporting frameworks (GRI, SASB, IFRS), international sustainability rating indicators (MSCI, S&P CSA, CDP), and benchmark corporate practices, the Company compiled a list of relevant sustainability issues. It also evaluated the issues of concern to the five key stakeholder groups and analyzed the potential impacts arising from its economic activities and upstream/downstream business relationships within the value chain. Through this comprehensive process, a list of 18 sustainability issues was developed, which serves as the basis for disclosure in this sustainability report.
 
 
Double materiality assessment combining impact materiality and financial materiality
The double materiality assessment was conducted by members of WT’s Sustainable Development Team, who analyzed each sustainability issue across two dimensions – “impact materiality” and “financial materiality” – and plotted them into a sustainability issue impact analysis matrix. This matrix serves as an assessment tool for continuously reviewing the level of impact of sustainability issues.The impact materiality assessment was performed in accordance with the GRI Sustainability Reporting Standards, analyzing each sustainability issue based on “severity” and “likelihood,” resulting in the identification of 11 sustainability issues with impact materiality. The financial materiality assessment was conducted by members of the Sustainable Development Team with reference to the IFRS Sustainability Disclosure Standards, analyzing each sustainability issue based on the “magnitude of impact” and “likelihood of occurrence” from a financial perspective, leading to the identification of five sustainability issues with financial materiality. In 2025, the results of this IFRS Sustainability Disclosure Standards materiality assessment were reported to the Board of Directors. These five financially material issues are all also among WT’s impact material issues.
 
Based on the 11 sustainability issues identified through the double materiality assessment, the Sustainable Development Team members have developed management approaches to strengthen the effectiveness of sustainability management.
 


 
Results of sustainability issue impact analysis



Impact Materiality 
High Low




● Economic Impact
● Sustainable Supply Chain
● Tax Management
● Innovation Management
● Quality Management
● Climate Strategy
● Energy Management


● Business Ethics (Integrity Management)
● Information Security




● Water Resource Management
● Waste Management
● Air Pollution Management
● Biodiversity
● Product Responsibility
● Talent Attraction and Retention


● Labor Practices (Human Capital Development)
● Human Rights & Community Relations (Diversity & Inclusion) 
● Employee Diversity & Inclusion (Diversity & Inclusion)
● Employee Health & Safety (Occupational Safety & Health) 





Low Financial MaterialityHigh





 
GRI material topics of the top 3 issues

Based on the results of the sustainability issue survey, WT analyzed the top three sustainability issues of concern to each stakeholder group, mapped them to the corresponding GRI material topics, and disclosed the implementation strategies, management approaches, and plans for these sustainability issues.
 
 


Shareholders/Banks

Ethical Management
Economic Impact
Talent Attraction and Retention



Customers

Information Security
Product Responsibility
Sustainable Supply Chain



Employees

Integrity Management
Information Security
Talent Attraction and Retention



Suppliers

Sustainable Supply Chain
Innovation Management
Product Responsibility



Other Vendors

Integrity Management
Human Capital Development
Sustainable Supply Chain
 



 
11 key disclosure issues in the 2025 sustainability report
In 2025, after comprehensively assessing the operational impact and likelihood of economic, environmental, and social impacts arising from WT’s activities, the Sustainability Task Force identified 11 key issues as the basis for disclosure in the 2025 Sustainability Report.




Positive Impact Ranking
 
Negative Impact Ranking


Information Security*
01
Information Security*


Economic Impact*
02
Talent Attraction & Retention*


Talent Attraction & Retention*
03
Economic Impact*


Sustainable Supply Chain*
04
Sustainable Supply Chain*


Human Capital Development*
05
Ethical Management*


Product Responsibility*
06
Product Responsibility*


Innovation Management*
07
Human Capital Development*


Climate Strategy*
08
Climate Strategy*


Energy Management*
09
Diversity & Inclusion*


Social Impact
10
Quality Management




Positive Impact Ranking
 
Negative Impact Ranking


Quality Management
11
Occupational Health & Safety


Diversity & Inclusion
12
Tax Management


Ethical Management
13
Energy Management


Tax Management
14
Social Impact


Occupational Health & Safety
15
Innovation Management


Waste Management
16
Waste Management


Water Resource Management
17
Water Resource Management


Air Pollution Management
18
Air Pollution Management


Biodiversity
19
Biodiversity



Note: *indicates material impact issues.

 
 
Explanation of key disclosure issues

9 GRI material topics and 2 self-defined topics

After reviewing the 33 economic, environmental, and social topics under the GRI Sustainability Reporting Standards, we mapped them against the key disclosure issues and selected 11 relevant material topics along with their corresponding disclosure indicators.
 
Defining the disclosure boundary of the sustainability report
Members of the Sustainable Development Team held meetings to review each key disclosure issue one by one, examining the impact on WT and its upstream and downstream value chain. It was confirmed that WT serves as the organizational disclosure boundary, while the scope of impact for each issue varies slightly depending on the nature of the issue.




Material Issue
Impact Scope

(Value Chain Impact Location)
Impact Dimension
Corresponding GRI Topic Standard


Vendor

(Procurement)
Other Supplier

(Procurement)
WT

(Operations & Sales)
Customer

(Downstream & Design)
End User

(Final Product)
Economic
Environmental
People

(Human Rights)




Economic Impact
◉
 
◉
◉
 
◼▲
◼
◼
201 Economic Performance 2016


Information Security
◉
 
◉
◉
 
◼▲
 
 
Self-defined topic


Integrity Management
◎
◎
◎
◎
 
▲
 
 
205 Anti-corruption 2016


Sustainable Supply Chain
◉
◎
◉
◉
◉
◼▲
◼▲
▲
204 Procurement Practices 2016

308 Supplier Environmental Assessment 2016

414 Supplier Social Assessment 2016


Innovation Management
Self-defined indicator


Product Responsibility
416 Customer Health and Safety 2016


Climate Strategy
◉
 
◉
◉
 
◼▲
◼▲
 
305 Emissions 2016


Energy Management
302 Energy 2016


Talent Attraction and Retention
◉
 
◉
◉
 
◼▲
 
◼▲
201 Economic Performance – Retirement Plans 2016

202 Market Position 2016

401 Employment 2016

402 Labor/Management Relations 2016

405 Diversity and Equal Opportunity 2016


Diversity and Inclusion
405 Diversity and Equal Opportunity 2016


Human Capital Development
404 Training and Education 2016





Note 1: Impact scope: Potential ◎ (not yet occurred) / Actual ◉ (already occurred)
Note 2: Impact dimension and nature: Positive █ (increase in stakeholder benefits) / Negative ▲ (decrease in stakeholder benefits)