UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF OCTOBER 2025

Commission File Number: 333-04906

SK Telecom Co., Ltd.

(Translation of registrant’s name into English)

65, Euljiro, Jung-gu

Seoul 04539, Korea

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Preliminary Results of Operations

• The preliminary results shown below may differ from the final results.

1. Basis: Consolidated


Classification (unit : in 100 millions of Won, %)		Current Period (Third quarter⁽¹⁾ of 2025)		Previous Period (Second quarter⁽²⁾ of 2025)		Changes (%)		Year to Year Comparison (Third quarter⁽¹⁾ of 2024)		Changes (%)
Operating Revenue	Quarterly Results		39,781		43,388		(8.31)		45,321		(12.23)
Operating Revenue	Year-to-date (“YTD”)⁽³⁾ Results		127,705		—		—		134,291		(4.90)
Operating Income	Quarterly Results		484		3,383		(85.68)		5,333		(90.92)
Operating Income	YTD⁽³⁾ Results		9,541		—		—		15,693		(39.20)
Profit (Loss) from Continuing Operations Before Income Tax	Quarterly Results		(1,639)		2,404		N.A*		3,647		N.A*
	YTD⁽³⁾ Results		5,844		—		—		12,836		(54.47)
Profit (Loss) for the Period	Quarterly Results		(1,667)		832		N.A*		2,802		N.A*
Profit (Loss) for the Period	YTD⁽³⁾ Results		2,781		—		—		9,923		(71.97)
Attributable To: Controlling Interests	Quarterly Results		(1,582)		896		N.A*		2,689		N.A*
Attributable To: Controlling Interests	YTD⁽³⁾ Results		2,959		—		—		9,593		(69.16)

(1) Refers to the three-month period from July 1 to September 30 of a given year.

(2) Refers to the three-month period from April 1 to June 30 of a given year.

(3) Refers to the nine-month period from January 1 to September 30 of a given year.

* Means “not applicable.”

2. Basis: Separate


Classification (unit : in 100 millions of Won, %)		Current Period (Third quarter⁽¹⁾ of 2025)		Previous Period (Second quarter⁽²⁾ of 2025)		Changes (%)		Year to Year Comparison (Third quarter⁽¹⁾ of 2024)		Changes (%)
Operating Revenue	Quarterly Results		26,647		31,351		(15.00)		32,032		(16.81)
Operating Revenue	YTD⁽³⁾ Results		89,673		—		—		95,834		(6.43)
Operating Income (Loss)	Quarterly Results		(522)		2,509		N.A*		4,570		N.A*
Operating Income (Loss)	YTD⁽³⁾ Results		6,811		—		—		13,438		(49.32)
Profit (Loss) Before Income Tax	Quarterly Results		(2,305)		1,950		N.A*		2,918		N.A*
Profit (Loss) Before Income Tax	YTD⁽³⁾ Results		5,655		—		—		12,443		(54.55)
Profit (Loss) for the Period	Quarterly Results		(2,066)		369		N.A*		2,224		N.A*
Profit (Loss) for the Period	YTD⁽³⁾ Results		3,048		—		—		9,948		(69.36)

(1) Refers to the three-month period from July 1 to September 30 of a given year.

(2) Refers to the three-month period from April 1 to June 30 of a given year.

(3) Refers to the nine-month period from January 1 to September 30 of a given year.

* Means “not applicable.”


3. Source of Data	Data Provider	IR, SK Telecom

	Provided for	Analysts and Investors

	Date of Provision	October 30, 2025 / 10:00 a.m. (Seoul time)

	Location	2025 3Q Earnings Results Conference Call

	Organizing Team	IR, SK Telecom (+82-2-6100-2114)

4. Other Important Matters Relating to an Investment Decision	- The preliminary results set forth in this report have been prepared on a consolidated basis and separate basis in accordance with International Financial Reporting Standards as adopted in Korea and may be subject to change based on the results of the audit by the Company’s external auditor. - For further relevant materials, please refer to the Company’s IR website at: https://www.sktelecom.com/en/investor/lib/announce.do

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.


SK TELECOM CO., LTD.
(Registrant)

By:		/s/ Hee Jun Chung
(Signature)
Name:		Hee Jun Chung
Title:		Vice President

Date: October 30, 2025

SK TELECOM CO LTD 6-K