003600 on Korean Stock Exchange

SK Inc.

Logo: SK Group, Public domain, via Wikimedia Commons4

South Korean company

SK Inc. (Korean: 에스케이 주식회사) is the holding company of South Korea's SK Group and is headquartered in Seoul, South Korea. The company is divided into Investment Division and Business Division. The Investment Division operates as a holding company engaged in petroleum, telecommunications, wholesale and retail, chemicals, semiconductors, biotechnology, and other industries.3 Its shares trade on Korean Stock Exchange under the symbol 003600.1 Wikipedia text CC BY-SA 4.0

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Last updated Oct 21, 2026.

Overview

1991Founded1

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  • Ticker003600 on Korean Stock Exchange1
  • Industryconglomerate1
  • HeadquartersSeoul1
  • Websitewww.sk-inc.com/en
  • Legal formjusik hoesa1
  • Incorporated inKorea, Republic of5
  • Business address26, Jong-Ro, Jongno-Gu, Seoul, M5 031885

SK Inc. (Korean: 에스케이 주식회사) is the holding company of South Korea's SK Group and is headquartered in Seoul, South Korea. The company is divided into Investment Division and Business Division. The Investment Division operates as a holding company engaged in petroleum, telecommunications, wholesale and retail, chemicals, semiconductors, biotechnology, and other industries. It holds the SK Group's major subsidiaries, including SK Innovation, SK Telecom, SKC, SK Networks, SK Materials, and SK Biopharmaceutical. The Business Division, SK Inc. C&C, provides system integration, software design and development, information processing, and consulting services.3

Corporate structure

SK Inc. sits at the top of its group. 48 entities, 12 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • SK Inc. Seoul
    • SK Group Subsidiary · Seoul
      • 11Street Subsidiary · Jung District, South Korea
      • Nate Communications Subsidiary · Seoul
      • SK Hynix Subsidiary · Icheon-si, South Korea
        • SK Hynix (Japan) Subsidiary · Tokyo, Japan
        • SK HYNIX NAND PRODUCT SOLUTIONS CORP. Subsidiary · 100% · Wilmington, County of New Castle, Delaware, United States
          • 5 more
        • 에스케이하이닉스 시스템아이씨 주식회사 Subsidiary · 100% · Cheongju-si, South Korea
        • LG Semiconductor Subsidiary
        • SK Hynix (United States) Subsidiary · United States
        • SK HYNIX VENTURES HONG KONG LIMITED Subsidiary · Taikoo Place, Hong Kong
      • SK Teletech Subsidiary
      • SK EnClean Subsidiary · South Korea
      • SK gas Subsidiary · South Korea
    • SK Innovation Subsidiary · Seoul, South Korea
      • SK Energy Subsidiary · Seoul, South Korea
      • SK Incheon Petrochem Subsidiary · Incheon
      • SK E&S HONGKONG CORPORATION LIMITED Subsidiary · 100% · Hongkong, Hong Kong
      • SK에너지 주식회사 Subsidiary · 100% · Seoul, South Korea
      • SK인천석유화학(주) Subsidiary · 100% · Incheon Metropolitan City, South Korea
      • SK지오센트릭 주식회사 Subsidiary · 100% · Seoul, South Korea
        • SK GC AMERICAS INC. Subsidiary · Houston, Texas, United States
          • 1 more
      • 에스케이온 주식회사 Subsidiary · 90.3% · Seoul, South Korea
        • SK On Hungary Korlatolt Felelossegu Tarsasag (SK On Hungary Korlátolt Felelősségű Társaság) Subsidiary · Komárom, Hungary
      • 에스케이아이이테크놀로지 Subsidiary · 61.2% · Seoul, South Korea
        • SK HI-TECH BATTERY MATERIALS POLAND SPOLKA Z OGRANICZONA ODPOWIEDZIALNOSCIA Subsidiary · Dąbrowa Górnicza, Poland
      • PRISM ENERGY INTERNATIONAL PTE. LTD. Subsidiary · Singapore, Singapore
      • SK E&P AMERICA, INC. Subsidiary · Houston, Texas, United States
        • SK PLYMOUTH, LLC Subsidiary · Houston, Texas, United States
      • SK ENERGY EUROPE LIMITED Subsidiary · London, United Kingdom
    • SK Telecom Subsidiary · 서울특별시, South Korea
    • SK Square Stake · 32.14% · M5
    • Chindata Group Holdings Ltd Stake · Beijing, China
    • Londian Wason New Energy Tech Inc. Stake · Shenzhen, China
    • Net Power Inc. Stake · Houston, Texas
    • SES AI Corp Stake · Woburn, Massachusetts

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0); major holders from Schedules 13D and 13G; stakes of 5% or more it reported on Schedules 13D and 13G (4 companies). Each entity in the chart links to its source.

What it owns

What SK Inc. reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Stakes and holdings (Wikidata)

Things Wikidata records the company as owning, with the share when stated.1

The story

In 1998, the company began providing services to SK Group affiliates. SK Holdings was established when SK Group decided to reorganize South Korea's biggest refiner SK Corporation into a holding company structure after a high-profile battle with Dubai-based fund Sovereign Asset Management in 2003. Although Sovereign failed to oust fraud-convicted chairman Chey Tae-won, SK sought to increase transparency and corporate governance to prevent further pressures from activist shareholders. In 2007, SK Corporation was split into two entities, with SK Energy inheriting the core business and SK Holdings serving as a holding firm with stakes in various affiliates of the SK Group conglomerate.

Despite the reorganization, consistent concerns had been raised over the unstable structure of corporate governance. Although SK Holdings was a holding company, SK's information technology service provider SK C&C controlled the group through its 31.8 percent stake in SK Holdings. Accordingly, SK merged SK Holdings and SK C&C to streamline its management structure in 2015. The merger between two companies enabled group chairman Chey Tae-won and his related parties to hold more than a 30% stake in the new SK Holdings. It solidified their ownership compared to the pre-merger when Chey's stake in ex-SK Holdings was only 0.02 percent.

In 2021, SK Holdings changed its name to SK Inc.

From Wikipedia’s article on SK Inc., shared under CC BY-SA 4.0.6

Subsidiaries and ownership

Owners

Subsidiaries

Also owns

From Wikidata.1

Timeline

  1. Nov 11, 2009Went public Listed on Korean Stock Exchange1
  2. 1991Founded Founded1

Stakes it holds

SK Inc. has told the SEC it owns more than 5% of 4 companies, latest first (Schedules 13D and 13G).

SEC filer profile

How SK Inc. is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARSK INC.2
  • CIK0001947998
  • Employer ID (EIN)98-11832812
  • Incorporated inKorea, Republic of2
  • Fiscal year endsDecember 312
  • Business address26, Jong-Ro, Jongno-Gu, Seoul, M5 031882
  • Phone822212151142
  • On EDGAR sinceSep 28, 20222
  • Filings46 in all: 4 (35), 3 (2), SCHEDULE 13D/A (2), 4/A (1), SC 13D (1), SC 13D/A (1), SC 13G (1), SC 13G/A (1)2
    All 10 form types

    SCHEDULE 13G (1), SCHEDULE 13G/A (1)