View source for SK Group

{{Short description|South Korean conglomerate}}
{{Infobox company
| name = SK Group
| native_name = 에스케이그룹
| logo = [[File:SK logo.svg|150px]]
| type = [[Privately held company|Private]]
| traded_as =
| image = [[File:SK Group Headquarters (SK그룹 본사 건물).JPG|border|200px]]
| image_caption = The SK Group Headquarters in January 2014
| foundation = {{start date and age|1953|04|08|df=y}}
| founder = Chey Jong-gun
| location = [[Seoul]], South Korea
| area_served = Worldwide
| key_people = {{Plain list|
* [[Chey Tae-won]] <small>([[Chairman]] & [[CEO]])</small>
* Cho Dae-sik <small>(Chairman of the SUPEX Council (de facto head))</small><ref>{{cite web |url=https://www.koreatimes.co.kr/www/news/biz/2016/12/123_220610.html |title=SK conducts sweeping personnel reshuffle |date=21 December 2016 |access-date=9 July 2017 |archive-date=22 December 2016 |archive-url=https://web.archive.org/web/20161222181852/http://www.koreatimes.co.kr/www/news/biz/2016/12/123_220610.html |url-status=live}}</ref>
}}
| industry = [[Conglomerate (company)|Conglomerate]]
| products = [[Energy]] and [[chemical]]s, [[telecommunications]], [[information technology]], [[International trade|trading]] and [[Service (economics)|services]], [[semiconductors]]
|num_employees={{formatnum:117590}}
|num_employees_year=2021
| subsid = {{Plain list|
* [[SK Innovation]]
* [[SK Telecom]]
* [[SK Hynix]]
* [[SK Inc.]]
}}
| homepage = {{URL|http://www.sk.com/en/}}
}}

'''SK Group''' ({{Korean|hangul=SK그룹; 에스케이그룹}}) is a South Korean [[Multinational corporation|multinational]] [[manufacturing]] and [[services sector|services]] [[Conglomerate (company)|conglomerate]] headquartered in [[Seoul]]. A [[chaebol]] (Korean family-owned conglomerate), SK Group is the second largest such conglomerate by revenue in South Korea, after [[Samsung|Samsung Group]]. Through a number of subsidiaries, it is engaged in various businesses, including manufacture of [[chemicals]] and [[petrochemical]]s, [[semiconductor]]s, [[flash memory]] and miscellaneous [[information technology]], as well providing [[telecommunications]] services worldwide among its other less notable ventures.

The conglomerate is composed of 186 subsidiaries and affiliates that share the SK brand name and the group's management culture, named SKMS (SK Management System). It changed its name from '''Sunkyong Group''' ({{Korean|hangul=선경그룹|hanja=鮮京그룹|labels=no}}) to SK Group in 1998. The group is controlled by estate of [[Chey Tae-won]] through a holding company, [[SK Inc.]] The cornerstone of SK Group is its energy and chemicals division.<ref>{{Cite web |title=SK Group {{!}} Encyclopedia.com |url=https://www.encyclopedia.com/books/politics-and-business-magazines/sk-group |url-status=live |archive-url=https://web.archive.org/web/20200326055535/https://www.encyclopedia.com/books/politics-and-business-magazines/sk-group |archive-date=2020-03-26 |access-date=2020-03-25 |publisher=www.encyclopedia.com}}</ref>

== History ==
===Formation and early production===
As with many other [[chaebol]]s, SK Group's chairmanship was 'inherited' from father to son: from its late founder Chey Jong-hyon to its present chairman [[Chey Tae-won]] (eldest son). Chey Tae-won was married to the daughter of the former South Korean President [[Roh Tae-woo]] until 2015.<ref>{{cite book|last=Ungson & Wong|title=Global Strategic Management|year=2008|publisher=M.E. Sharpe|url=https://books.google.com/books?id=-Mv7U69x9mcC&pg=PA462|isbn=9780765628978|access-date=2016-03-21|archive-date=2020-08-19|archive-url=https://web.archive.org/web/20200819145914/https://books.google.com/books?id=-Mv7U69x9mcC&pg=PA462|url-status=live}}</ref>

SK Group began when the current founders acquired Sunkyong Textiles (founded during the [[Korea under Japanese rule|Japanese rule]] as a joint venture between two Japanese companies, Senman Chutan and [[Kyoto]]-based Kyoto Orimono Company) from South Korean government as abandoned property of Japan in 1953.<ref>{{cite book |title=Big Business—Strong State |last=Mee Kim |first=Eun |year=1999 |publisher=SUNY Press |isbn=978-0-7914-3209-9 |page=91 }}</ref> In 1958, the company manufactured Korea's first [[polyester]] fiber on company grounds. It established Sunkyong Fibers Ltd. in July 1969, and started to produce original yarn. In 1973, SK then established Sunkyong Oil, beginning a vertical integration strategy to manage production, "From Petroleum to Fibers". That same year, the company acquired the Walkerhill Hotel.

In 1976, Sunkyong Corporation received an international trading company license from the Indian government.<ref>{{cite news |title=Diversifying into the Global Marketplace |publisher=Korean Integrated News Database System |date=August 30, 2001 |url=http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100201.20010830KTM0007 |url-status=dead |archive-url=https://web.archive.org/web/20080311012550/http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100201.20010830KTM0007 |archive-date=March 11, 2008 }}</ref> In December 1980 SK purchased privately run Korea National Oil, making it Korea's fifth largest [[Conglomerate (company)|conglomerate]].<ref>{{cite book |title=Financial Crisis and Transformation of Korean Business Groups |url=https://archive.org/details/financialcrisist00chan |url-access=limited |last=Chang |first=Se-jin |year=2003 |publisher=Cambridge University Press |isbn=978-0-521-81435-5 |page=[https://archive.org/details/financialcrisist00chan/page/n83 70] }}</ref> In January 1988, crude oil was imported for processing to Korea from [[Yemen]]'s [[Marib]] oil field.<ref>{{Cite news |date=2023-07-20 |title=SK Chairman Chey Tae-won leads Korean industries as head of KCCI |url=https://www.koreapost.com/news/articleView.html?idxno=28842 |access-date=2025-04-25 |work=Korea Post |language=en-GB}}</ref>

===1990s to 2000s===
In June 1994, SK entered Korea's telecommunications business by becoming Korea Mobile Telecommunication Service's largest shareholder.<ref>{{Cite web|url=http://www.sktelecom.com/eng/jsp/sktelecom/ourhistory/History.jsp|archive-url=https://web.archive.org/web/20080428214434/http://www.sktelecom.com/eng/jsp/sktelecom/ourhistory/History.jsp|url-status=dead|title=SKtelecom.com|archive-date=April 28, 2008}}</ref> In January 1996, SK Telecom launched Korea's first commercial [[CDMA]] cellular phone service in [[Incheon]] and [[Bucheon]].<ref>{{cite book |title=Sustaining Corporate Growth: Harnessing Your Strategic Strengths |last=Kearney (Firm) |first=Kearney, Inc, A. T |year=2000 |publisher=CRC Press |isbn=978-1-57444-289-2 |page=[https://archive.org/details/sustainingcorpor0000atke/page/75 75] |url-access=registration |url=https://archive.org/details/sustainingcorpor0000atke/page/75 }}</ref> In 1998, Management re-branded Sunkyong to SK.<ref>{{cite web|url=http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.19980105KRM0008 |title=Sunkyong Sets Sails as SK Group Today |access-date=2008-01-23 |url-status=dead |archive-url=https://web.archive.org/web/20080311012527/http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.19980105KRM0008 |archive-date=March 11, 2008 }}</ref> In 1999, SK Chemicals developed third-generation (non cross resistant) platinum-complex anti-cancer agent.<ref>{{cite news|title=Korea's first locally developed drug gets KFDA approval|publisher=Korean Integrated News Database System|date=July 15, 1999|url=http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.19990715KRM0040|url-status=dead|archive-url=https://web.archive.org/web/20080311012532/http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.19990715KRM0040|archive-date=March 11, 2008}}</ref> Also, by focusing its research and development efforts on life sciences, SK Corporation developed YKP1358, a new drug candidate for [[schizophrenia]], in 2003.<ref>{{cite news|title=SK gets nod to test Schizophrenia drug|publisher=Korean Integrated News Database System|date=September 7, 2003|url=http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.20031007KRM0019|url-status=dead|archive-url=https://web.archive.org/web/20080311012545/http://www.kinds.or.kr/main/search/searchcontent.php?docid=03100101.20031007KRM0019|archive-date=March 11, 2008}}</ref><ref>{{cite news|title=SK Corporation Announces Another IND, Schizophrenia Drug YKP1358 |date= October 8, 2003 |url= http://www.highbeam.com/doc/1G1-108638092.html |archive-url= https://web.archive.org/web/20110517001709/http://www.highbeam.com/doc/1G1-108638092.html |url-status= dead |archive-date= May 17, 2011 }}</ref> In 2002, SK Telecom successfully launched the world's first commercial [[CDMA]] 1X [[EV-DO]] technology, allowing it to offer [[3G]] telecommunications service.<ref>{{cite news|title=South Korea the World's First 3G Network|publisher=3GNewsroom.com|date=May 31, 2001|url=http://www.3gnewsroom.com/3g_news/may_01/news_0709.shtml|url-status=dead|archive-url=https://web.archive.org/web/20080310183835/http://www.3gnewsroom.com/3g_news/may_01/news_0709.shtml|archive-date=March 10, 2008}}</ref><ref>{{cite news |date=January 27, 2002 |title=SK Starts New Generation Mobile Phone Service |url=https://sustainabletechnology.uk.com/ |publisher=sustainabletechnology.uk.com |archive-date=May 21, 2025 |access-date=April 25, 2025 |archive-url=https://web.archive.org/web/20250521220501/https://sustainabletechnology.uk.com/ |url-status=dead }}</ref> In 2004, SK Telecom enabled satellite [[Digital Multimedia Broadcasting|DMB]] service by deploying the world's first DMB satellite.<ref>{{cite news|title=Questions, Expectations over DMB Service|publisher=[[Korea.net]]|date=March 20, 2004|url=http://www.kois.go.kr/news/news/NewsView.asp?serial_no=20040319010&part=107&SearchDay=|url-status=dead|archive-url=https://web.archive.org/web/20080310221934/http://www.kois.go.kr/news/news/NewsView.asp?serial_no=20040319010&part=107&SearchDay=|archive-date=March 10, 2008}}</ref> Moreover, in 2006, SK began revitalizing the 3.5-generation mobile phone market and in the following year, completed the construction of the national [[HSDPA]] network. In May 2006, SK Telecom started the world's first commercial 3.5-generation HSDPA service, featuring high-quality video telephony and data transmission, and global roaming access.<ref>{{cite web | url = http://www.umts-forum.org/content/view/984/85/ | title = SK Telecom Selects LGE, Nortel UMTS/HSDPA Wireless Broadband Technology | access-date = 2008-01-23 | archive-date = 2011-07-18 | archive-url = https://web.archive.org/web/20110718015934/http://www.umts-forum.org/content/view/984/85/ | url-status = live }}</ref> 

In 2005, SK Networks opened China's first two wholly foreign-owned, gas stations in Shenyang. Then, after exploring Brazilian mining area BM-C-8, SK Corporation developed an oil field where it confirmed the existence of more than 50 million barrels of oil deposits.<ref>{{cite news |title=SK Energy Acquires Oil Production Rights in Brazil |publisher=[[Korea.net]] |date=July 30, 2007 |url=http://korea.net/news/news/NewsView.asp?serial_no=20070730019&part=107&SearchDay= |access-date=2008-01-25 |archive-url=https://web.archive.org/web/20080310212841/http://korea.net/news/news/NewsView.asp?serial_no=20070730019&part=107&SearchDay= |archive-date=2008-03-10 |url-status=dead }}</ref> SK Gas began developing resources overseas when it participated in two mining areas to the west of Russia's Kamchatka peninsula in March 2006. In early 2006, SK Networks also developed Ecol-Green, a [[biodegradable plastic]] material. Incheon Oil officially started operations using the SK name in March 2006.<ref>{{cite web | url = http://www.iht.com/articles/2005/09/04/bloomberg/sxsk.php | title = SK Corp. buys Inchon to raise oil exports | access-date = 2008-01-23 | archive-date = 2008-03-16 | archive-url = https://web.archive.org/web/20080316142536/http://www.iht.com/articles/2005/09/04/bloomberg/sxsk.php | url-status = live }}</ref> SK Energy is currently engaged in 27 oil fields in 15 countries worldwide. SKC imported [[propylene oxide]] (PO, a chemical used in manufacturing [[polyurethane]]) production technology from Germany in May 2006. It is scheduled to produce 100,000 tons of PO from 2008.<ref>{{cite news |title=Uhde will build SKC HPPO unit |publisher=[[Korea.net]] |date=May 22, 2006 |url=http://www.icis.com/Articles/2006/05/19/2014111/uhde-will-build-skc-hppo-unit.html |access-date=January 25, 2008 |archive-date=March 10, 2008 |archive-url=https://web.archive.org/web/20080310234339/http://www.icis.com/Articles/2006/05/19/2014111/uhde-will-build-skc-hppo-unit.html |url-status=live }}</ref>

At the end of 2005, SK Corp. developed a lithium-ion battery separator (LiBS) for the first time in Korea, and started selling the product in 2006. In July 2007, SK Group adopted a holding company structure.<ref>{{cite news |url=http://uk.reuters.com/article/oilRpt/idUKSEO31873720070411 |title=SK Corp to split as adopts holding co. structure |work=Reuters |access-date=2008-01-23 |date=April 11, 2007 |archive-date=2009-01-12 |archive-url=https://web.archive.org/web/20090112024024/http://uk.reuters.com/article/oilRpt/idUKSEO31873720070411 |url-status=dead}}</ref><ref>{{cite web | url = https://www.koreatimes.co.kr/www/news/biz/2007/07/123_5759.html | title = SK Launches Holding Company System | access-date = 2008-01-23 |archive-url = https://web.archive.org/web/20070930011204/https://www.koreatimes.co.kr/www/news/biz/2007/07/123_5759.html <!-- Bot retrieved archive --> |archive-date = 2007-09-30| date = 2007-07-02 }}</ref> Under the re-organization, SK's main entity, SK Corporation, was split into an investment company, now SK Inc. and an operating company, now SK Energy. The subsidiary companies that now operate under the central SK Inc. umbrella include: SK Energy, SK Telecom, SK Networks, SKC, SK E&S, SK Shipping and K Power. SK acquired Hynix for US$3 billion in February 2012,<ref>{{cite news |last=Park |first=Ju-Min |date=November 11, 2011 |title=SK Telecom picked for $3 bln Hynix deal |url=https://www.reuters.com/article/idUSTRE7AA1F1/ |work=Reuters |location=Seoul |access-date=}}</ref><ref>{{cite news |last=Lee |first=Jung-Ah |date=November 14, 2011 |title=SK Telecom to Buy Hynix Stake for $3.04 Billion |url=https://www.wsj.com/articles/SB10001424052970204190504577037864059713458 |work=The Wall Street Journal |location=Seoul |access-date=}}</ref><ref>{{cite news |date=February 14, 2012 |title=Hynix names Chey as co-CEO as SK completes $3 billion deal |url=https://www.reuters.com/article/us-hynix-ceo-idUSTRE81D0BU20120214/?feedType=RSS&feedName=innovationNews |work=Reuters |location=Seoul |access-date=}}</ref> rebranding it to SK Hynix.

===Recent history===
In February 2017, SK acquired the polyethylene acrylic acid business of [[Dow Chemical Company]] for $370 million,<ref>{{Cite news |title=Deals of the day-Mergers and acquisitions |url=https://www.reuters.com/article/deals-day-idUSL4N1FN2KN/ |archive-url=https://web.archive.org/web/20230425205030/https://www.reuters.com/article/deals-day-idUSL4N1FN2KN |archive-date=2023-04-25 |access-date=2025-04-25 |work=U.S. |language=en-US |url-status=live }}</ref> and planned to increase battery production capacity from 1.9 to 3.9 GWh per year at the end of 2018, supplying Kia and Mercedes.<ref>{{cite web|last1=Lambert |first1=Fred |url=https://electrek.co/2017/03/06/sk-innovation-expanding-battery/|title=SK Innovation is doubling its battery production for electric vehicles to 4GWh/year to support demand from Mercedes and others|date=6 March 2017|work=Electrek|access-date=6 March 2017|archive-date=7 March 2017|archive-url=https://web.archive.org/web/20170307050006/https://electrek.co/2017/03/06/sk-innovation-expanding-battery/|url-status=live}}</ref>

In July 2022, SK Group announced a $22 billion investment in the United States semiconductor, green energy bioscience and other technology industries. In total, SK Group will invest over $52 billion in the United States by 2025.<ref>{{Cite web |title=Biden hails $22 bln investment by S. Korea's SK Group |url=https://sg.news.yahoo.com/biden-hails-22-bln-investment-130443117.html |access-date=2022-07-27 |website=sg.news.yahoo.com |language=en-SG}}</ref>

SK Networks said August 20, 2024 it has sold its rental car unit for 820 billion won (US$618 million) to a Singapore-based private equity fund.<ref>{{cite web |last=Kyong-ae |first=Choi |date=2024 |title=ESK Networks completes selling rental car unit to private equity firm |url=https://en.yna.co.kr/view/AEN20240820004500320?section=k-biz/corporate |website=Yonhap News}}</ref> In November 2024, SK Group Chairman [[Chey Tae-won]] was appointed chairman of the board of directors of Soldigm, SK Hynix's U.S.-based NAND flash memory unit.<ref>{{Cite web |title=최태원, SK하이닉스 자회사 美 솔리다임 이사회 의장 선임 |trans-title=Chey Tae-won appointed as chairman of the board of Solidigm, a U.S. subsidiary of SK Hynix. |url=https://n.news.naver.com/mnews/article/366/0001032274?sid=105 |access-date=2024-11-15 |website=n.news.naver.com |language=ko}}</ref> On Dec. 23, 2024, SK sold 85 percent of its subsidiary SK Specialty to Hahn & Company, a domestic private equity fund (PEF). The value of the stake in the sale is worth about W2.7 trillion.<ref>{{Cite web |title=SK㈜, 한앤컴퍼니에 SK스페셜티 지분 85% 매각…2.7조원 규모 |trans-title=SK Inc. sells 85% stake in SK Specialty to Hahn & Company… deal valued at 2.7 trillion won. |url=https://n.news.naver.com/mnews/article/277/0005522301?sid=101 |access-date=2025-01-03 |website=n.news.naver.com |language=ko}}</ref>

== Subsidiaries ==
[[File:SK Building.jpg|200px|thumb|SK Building in [[Beijing central business district|Beijing CBD]]]]

=== Holdings ===
* '''[[SK Inc.]]''' ({{kse|003600}}) is a [[holding company]] which resulted when SK Corporation was reorganized on July 1, 2007, into a holding company and operating company, SK Inc. and SK Energy, respectively. SK Inc. is a part of the SK Group that focuses on 4 core business interests, High-tech materials, Bio, Green and Digital. The SK Group is composed of 186 affiliate companies that share the SK brand and culture. In 2021, SK Group recorded combined revenues of $133 billion, with exports contributing $50 billion of that total. SK continues to expand its global presence, with more than 117,590 employees who work from 473 offices worldwide.

=== Energy and chemicals ===
* '''[[SK Innovation]]''' ({{kse|096770}}) is a South Korean enterprise formed as part of the July 1, 2007 reorganization of SK Corporation into a holding company and operating company, SK Inc. and SK Energy, respectively. In 2011, the petroleum business was spun off to become SK Energy. Simultaneously the chemical business was spun off to become SK Innovation. SK Energy was founded in 1962 as Korea's first oil refinery. In 1982, changed company name to '''Yukong'''. SK Energy is an energy and petrochemical company with 5,000 employees, KRW 23.65 trillion in sales and 26 offices spanning the globe. The company is Korea's largest (and Asia's fourth largest) refiner with a refining capacity of 1.15 million barrels per day, as of 2006. SK Energy is engaged in exploration and development activities in 26 oil / gas blocks in 14 nations worldwide.<ref>{{cite news|title= China Aviation faces 3rd creditor lawsuit|work= International Herald Tribune|date= February 24, 2005|url= http://www.iht.com/articles/2005/02/23/bloomberg/sxsk.php|access-date= September 3, 2007|archive-date= March 16, 2008|archive-url= https://web.archive.org/web/20080316142500/http://www.iht.com/articles/2005/02/23/bloomberg/sxsk.php|url-status= live}}</ref><ref>{{cite news|title=New probe hits SK chief|publisher=[[BBC News]]|date=September 22, 2003|url=http://news.bbc.co.uk/1/hi/business/3128154.stm|access-date=September 3, 2007|archive-date=June 8, 2004|archive-url=https://web.archive.org/web/20040608173724/http://news.bbc.co.uk/1/hi/business/3128154.stm|url-status=live}}</ref><ref>{{Cite web |last=Byung-wook |first=Kim |date=2022-01-26 |title=SKC-led consortium bets $80m for next-generation EV battery materials |url=https://www.koreaherald.com/article/2773348 |access-date=2025-04-25 |website=The Korea Herald |language=en}}</ref>
* '''SKC''' ({{kse|011790}}), headquartered in [[Seoul]], is the leading Korean company in chemical and film industry. SKC was founded and established in 1976 as previous name of Sunkyong Chemicals Ltd ({{Korean|hangul=선경화학(주)|labels=no}}). SKC developed polyester films firstly in Korea, by its own efforts. With its main plant and R&D center located in [[Suwon]], [[South Korea]], it also operates large capacity of film plant in [[Covington, Georgia]], United States. SKC is engaged in chemicals, films, and solar. Including all subsidiaries, the company reported revenue of KRW2.7 trillion and operating profit of KRW190 billion in 2021. Its debt-to-equity ratio was 138% as of 3Q15. As one of the few conglomerates in Korea that focuses on chemical/material/component manufacturing and R&D, it has a long history among SK Group companies. In the past, the company produced videos, floppy disks, CDs, etc. but is now mainly engaged in B2B business such as chemical solutions, industrial films, and new materials. It is often confused with SK chemicals, but they are not the same company.
* '''SK Innovation E&S''': A comprehensive energy company. Its businesses include city gas, LNG, and renewable energy. It holds 22 per cent of the domestic city gas market. Recently, it has entered the hydrogen energy business.

=== Information and communications technology ===
* '''[[SK Telecom]]''' ({{kse|017670}}) is Korea's No. 1 mobile phone company and the parent company of the SK Group ICT Family, a group of telecoms and semiconductor companies. As of the third quarter of 2024, [[SK Telecom]] recorded sales of KRW 4.532 trillion, operating profit of KRW 533.3 billion, and net profit of KRW 280.2 billion.<ref>{{Cite web |title=SK텔레콤 3분기 영업익 7.1% 증가한 5333억 원 |trans-title=SK Telecom's operating profit in Q3 increased by 7.1% to 533.3 billion won. |url=https://www.busan.com/view/busan/view.php?code=2024110612345171572 |access-date=2024-11-15 |website=부산일보 |language=ko}}</ref> Its debt-to-equity ratio is just 134 per cent.<ref>{{Cite web |date=2024-10-24 |title=SK텔레콤 "AI로 돈 버는 방법 구체화…2026년 ROE 10% 넘긴다" |trans-title=SK Telecom: “We are detailing ways to make money with AI… aiming for an ROE over 10% by 2026.” |url=https://www.ekn.kr/web/view.php?key=20241024027460637 |access-date=2024-11-15 |website=에너지경제신문 |language=ko}}</ref>
* '''[[SK Broadband]]: SK Broadband''' is responsible for wired and wireless internet communications, IPTV, telephony, IDC, and network solution products.
* '''SK Square''' ({{kse|402340}}) is a portfolio management company.
* '''[[SK Inc.|SK Inc. C&C]]''' was established in 1991 and is currently one of the "Big Three" IT services companies in Korea. SK C&C has business interests across IT services, including telecommunications, banking & finance, government, public, logistics, and other fields.
* '''[[SK Communications]]''': The company that operates Nate.
=== Semiconductor and materials ===
* '''[[SK Hynix]]''' ({{kse|000660}}) is the world's 3rd-largest semiconductor manufacturer and the 2nd-largest in South Korea after [[Samsung Electronics]] which is the leader in the global [[semiconductor industry]]. SK Hynix was founded in 1983 as "Hyundai Electronics", which is the origin of its name "Hynix", and merged to SK Group in 2012 when SK Telecom became the major shareholder. The major products are [[DRAM]], [[flash memory]], and many other semiconductor materials. While its headquarter is located at [[Icheon]], [[Gyeonggido]], it also runs a large production line at [[Cheongju]], [[North Chungcheong Province]].
* '''SK Siltron''' is the only semiconductor wafer manufacturer in Korea, and it has grown hand in hand with the semiconductor industry over the last 35 plus years. Armed with a record-long history of mass production and accumulated know-how, the company expands its production capacity in a preemptive manner and continues to strengthen its manufacturing and technology competitiveness. At the same time, the company is expanding its business portfolio to include emerging areas such as SiC wafers. This lays a strong foundation for SK Siltron to grow to become one of the world’s best semiconductor materials players both in production volume and profitability.

=== Logistics, services and bio ===
* '''SK Biopharmaceuticals''' ({{kse|326030}}) is a [[drug discovery]] and [[drug development]] company. It discovered [[solriamfetol]].<ref name=KH>{{cite news|last1=Ji-young|first1=Sohn|title=SK Biopharmaceuticals' narcolepsy drug on track to hitting US market|url=http://www.koreaherald.com/view.php?ud=20180305000684|work=[[The Korea Herald]]|date=5 March 2018|language=en|access-date=16 April 2018|archive-date=16 April 2018|archive-url=https://web.archive.org/web/20180416022520/http://www.koreaherald.com/view.php?ud=20180305000684|url-status=live}}</ref>
* '''[[SK Ecoplant]]''' is a Korean [[construction]] company founded and established in 1977 with a previous name of '''Sunkyong Construction''' ({{Korean|hangul=선경 건설}}), headquartered in [[Gwanhun-dong]] [[Jongno-gu]], Seoul. Its brands include SK View, SK Hub, and Apelbaum. The company's CEO is Ki Haeng Cho. Industries: Oil & Gas, Petrochemical, Power, Environmental Protection, Industrial, Civil, Building, Housing. Services:Feasibility Study, EPC Service, Project Management, Operations & Maintenance.
* '''[[SK Networks|SK networks]]''': A conglomerate that operates a variety of businesses, including trading, information and communication, energy distribution, consumer goods, and car rental.
* '''[[SK Oceanplant]]''': It is a subsidiary of SK Innovation, which produces offshore wind farms and ship parts.
* '''SK pharmteco''' is a global contract development and manufacturing organization specializing in the production of active pharmaceutical ingredients (APIs), intermediates and viral vectors for cell and gene therapy for the pharmaceutical industry. SK Pharmteco operates six facilities in Europe, North America and Korea.

== Management system ==
SK's subsidiary companies all operate under the SK Management System (SKMS) which was developed, articulated and enhanced by SK's Chairman, [[Chey Tae-won]].

On April 7, 2008, SK Group launched a marketing and management company named "SK Marketing & Company".

==Dissolution/Sale==
* '''Kyungsung Rubber Industries''': Merged into SK Warehouse in 1998.
* '''Kyungjin Shipping''': Liquidated in 1998 after transferring assets to a new company, Phil Ocean Shipping (now Inter Ocean Shipping).
* '''SK Life (now Mirae Asset Life)''': Acquired by [[Mirae Asset Securities|Mirae Asset Group]] in 2005.
* '''[[SK Wyverns]]''' (now '''[[SSG Landers]]'''): Sold to E-Mart in 2021.
== See also ==
{{Portal bar|Companies|South Korea}}
* ''[[Chaebol]]''
* [[Economy of South Korea]]
* ''[[H.A.V.E. Online]]''
* ''[[Fallen Age]]''

==References==
{{Reflist}}

{{SK Group}}
{{Chaebol}}
{{Authority control}}

{{DEFAULTSORT:Sk Group}}
[[Category:SK Group| ]]
[[Category:Chaebol]]
[[Category:Companies listed on the Korea Exchange]]
[[Category:Conglomerate companies established in 1953]]
[[Category:Conglomerate companies of South Korea]]
[[Category:Manufacturing companies based in Seoul]]
[[Category:Multinational companies headquartered in South Korea]]
[[Category:Non-renewable resource companies established in 1953]]
[[Category:Oil companies of South Korea]]
[[Category:Petrochemical companies]]
[[Category:South Korean brands]]
[[Category:Technology companies of South Korea]]
[[Category:South Korean companies established in 1953]]
[[Category:Manufacturing companies established in 1953]]