Form 6-K

Matters Relating to Corporate Sustainability Report of SK Telecom Co., Ltd. (the “Company”)


1. Title of the Report		“SK Telecom Sustainability Report 2025” (the “Report”)

2. Certifying Institution		DNV Business Assurance Korea

3. Reporting Standards		The Report has been prepared in accordance with the requirements of the GRI Standards, the sustainability reporting standards of the Global Reporting Initiative (GRI). It also references KSSB Sustainability Disclosure Standard No. 1 (General Requirements for Disclosure of Sustainability-Related Financial Information), No. 2 (Climate-Related Disclosure), as well as relevant standards such as SASB.

4. Filing Location		The Company’s corporate website (https://www.sktelecom.com/esg/lib/persist.do)

5. Details of the Report		1. Summary The Report is SK Telecom’s Sustainability Report, published to share the company’s sustainability management strategies, key activities, and achievements across environmental, social, and governance (ESG) areas with a wide range of stakeholders, including investors. 2. Reporting Period The reporting period for this report is from January 1, 2025 to December 31, 2025. Some qualitative activities are included up to May 2026. For quantitative data, four years of data from 2022 to 2025 are presented to enable year-on-year trend analysis. In cases where significant changes have occurred in previously reported data, past data have been recalculated based on 2025 and reflected accordingly. 3. Scope of the Report The geographical boundary of the Report is limited to the Republic of Korea, where over 99% of SK Telecom’s revenue is generated and its main business sites are located. Unless otherwise specified, data from SK Telecom’s overseas branches, subsidiaries, and affiliates are excluded from general descriptions and information. Financial data included in the Report are presented on a consolidated basis in accordance with the Korean International Financial Reporting Standards (“K-IFRS”), including K-IFRS No. 16, which has been applied since 2019. Non-financial data on environmental performance and fulfillment of corporate social responsibility are presented on a non-consolidated basis. 4. Table of Contents Business Overview - CEO Message, Business Overview, Sustainability Management Directions Special Report - From the Customer, By the Customer Material Topics - Information Security & Personal Data Protection, Technological Innovation, Climate Change Response


		ESG Management - Environmental: Environmental Management, Natural Capital, Circular Economy - Social: Employees, Health & Safety, Human Rights Management, Customer-Centric Management, Network Stability, Supply Chain Management, Community Engagement - Governance: Corporate Governance, Ethical Management, Compliance, AI Governance, Risk Management Appendix - Materiality Assessment, Stakeholder Engagement, Financial Statements, Non-Financial Statements, Index, About This Report

6. Submission Date		June 30, 2026

7. Other Important Matters Relating to an Investment Decision		The English version of the Report is expected to be posted on the Company’s corporate website within July 2026.


SK TELECOM CO., LTD.
(Registrant)

By:		/s/ Taehee Kim
(Signature)
Name:		Taehee Kim
Title:		Vice President