headquarters in january 2014 . type public industry conglomerate founded april 8 1953 ; 63 years ago 1953 04 08 headquarters seoul south korea key people chey tae won chairman & ceo products energy & chemicals telecommunications trading & services semiconductors construction shipping revenue us 98.917 billion 2011 net income us 1.51 billion 2011 number of employees 70 000 2012 website www.sk.com korean name hangul sk revised romanization sk geurup esukei geurup mccune reischauer sk k rup esukei k rup former hangul hanja revised romanization seongyeong geurup mccune reischauer s nky ng k rup this article contains korean text . without proper rendering support you may see question marks boxes or other symbols instead of hangul and hanja . sk group korean sk also known as sk holdings is one of the largest conglomerates chaebol in south korea . sk group is composed of 95 subsidiary and affiliate companies that share the sk brand and culture . it changed its name from sunkyoung group korean hanja to sk group in 1997 . sk holdings ranked 57th in the 2013 fortune global 500 . 1 sk group has more than 70 000 employees who work from 113 offices worldwide . while its largest businesses are primarily involved in the chemical petroleum and energy industries it also has south korea s largest wireless mobile phone service provider sk telecom and provides services in construction shipping marketing local telephone high speed internet and wireless broadband service wibro . sk has recently further broadened its range of business to semiconductors merging hynix into sk hynix the world s second largest memory semiconductor manufacturer . sk group headquarters base contents 1 history 2 core businesses 3 restructuring 4 member companies 5 management system 6 see also 7 references 8 external links history edit as with many other chaebols sk group s chairmanship was inherited from father to son from its founder the late chey john hyun to its present chairman chey tae won eldest son . chey tae won is married to the daughter of the former south korean president roh tae woo . 2 sk group began when the current founders acquired sunkyong textiles in 1953 . 3 in 1958 the company manufactured korea s first polyester fiber on company grounds . it established sunkyung 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 sunkyung corporation received an international trading company license from the indian government . 4 in december 1980 sk purchased privately run korea national oil making it korea s fifth largest conglomerate . 5 in january 1988 crude oil was imported for processing to korea from yemen s marib oil field . in june 1994 sk entered korea s telecommunications business by becoming korea mobile telecommunication service s largest shareholder . 6 in january 1996 sk telecom launched korea s first commercial cdma cellular phone service in incheon and bucheon . 7 in 2002 sk telecom successfully launched the world s first commercial cdma 1x ev do technology allowing it to offer 3g telecommunications service . 8 9 in 2004 sk telecom enabled satellite dmb service by deploying the world s first dmb satellite . 10 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 . 11 in 1998 management re branded sunkyong to sk . 12 in 1999 sk chemicals developed third generation non cross resistant platinum complex anti cancer agent . 13 also by focusing its research and development efforts on life sciences sk corporation developed ykp1358 a new drug candidate for schizophrenia in 2003 . 14 15 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 . 16 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 . 17 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 . 18 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 . 19 20 under the re organization sk s main entity sk corporation was split into an investment company now sk holdings and an operating company now sk energy . the subsidiary companies that now operate under the central sk holdings umbrella include sk energy sk telecom sk networks skc sk e & s sk shipping and k power core businesses edit sk s core businesses are energy and telecommunications . thirteen of sk companies are listed on the korea stock exchange sk holdings sk innovation sk telecom skc skc solmics sk chemicals sk c & c sk networks sk gas sk communications sk broadband sk hynix and sk securities . sk telecom s adrs are also listed on the new york stock exchange . restructuring edit sk restructured in 2007 . under the re organization sk s main entity sk corporation was split into an investment company now named sk holdings and an operating company now named sk energy . sk energy produces batteries for ct & t and hyundai electric vehicles . member companies edit sk building in beijing cbd some of the member companies that now operate under the sk brand include sk e & c sk energy sk telecom sk broadband sk networks sk planet skc sk e & s sk chemicals sk telesys sk shipping sk telink sk hynix sk corporation c & c walkerhill and sk wyverns . skc korean skc or krx 011790 headquartered in seocho dong seocho gu seoul is the leading korean company in chemical and film industry . skc was founded and established in 1976 as previous name of sunkyung chemicals ltd korean . skc developed polyester films firstly in korea by its own efforts . nowadays skc is one of the best polyester film makers in the world supplying 10 % of worldwide demands with its wide applications including labels lcds and solar cells . with its main plant and r & d center located in suwon south korea it also operates large capacity of film plant skc inc. in georgia united states . skc is now developing into one of the leading companies dealing with a variety of eco friendly advanced materials for the future energy and chemical industries such as biodegradable films battery components leds and photovoltaic materials . sk energy and sk innovation korean sk or and sk or krx 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 holdings 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 refiner . in 1982 changed company name toyukong.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 . 21 22 sk telecom korean sk or krx 017670 is a south korean company specializing in offering mobile phone services wired and wireless combined services . it is part of the sk group and has evolved from a first generation analog cellular system operator to become the company that launched the world s first commercial cdma service . sk telecom moved on to operate korea s first 2.5 g cdma 2000 1x system followed by the world s first commercial 3 g synchronized cellular system . sk telecom also launched the world s first 3.5 g hsdpa and hsupa services . citation needed sk e & c korean sk or is a korean construction company founded and established in 1977 with a previous name of sunkyung construction korean headquartered in gwanhun dong jongno gu seoul . its brands include sk view sk hub and apelbaum . the company s ceo is casey choi . industries oil & gas petrochemical power environmental protection industrial civil building housing . services feasibility study epc service project management operations & maintenance . sk corporation holdings korean sk or krx 003600 is the holding company which resulted when sk corporation was reorganized in july 1 2007 into a holding company and operating company sk holdings and sk energy respectively . sk holdings is a part of the sk group that focuses on 3 core business interests energy & chemicals telecommunications and trading & services . the sk group is composed of 88 affiliate companies that share the sk brand and culture . in 2006 sk group recorded combined revenues of 75.8 billion with exports contributing 26.4 billion of that total . sk continues to expand its global presence with more than 25 000 employees who work from 113 offices worldwide . sk telink korean sk or a subsidiary of sk telecom was established in april 1998 as an international telephony service provider and has grown into a major player in the international calling market . under the brand name 00700 the company provides international call services . building on the commercial long distance telephony and value added services launched in 2005 the company began offering korean sms in june 2006 in the u.s. the service allows subscribers to send and receive korean text messages in the u.s. as well as to and from korea . from 2008 on sk telink also started e learning service giving lectures to customers through the internet and foreign language test service bulats . bulats is being used as the main english speaking test for most of the sk group subsidiaries . sk planet korean sk or is a marketing and management company in the sk group . the company mainly derived from the marketing teams of sk energy and sk telecom . it was established on april 4 2008 . the company accounts for several services which were previously provided by sk energy and sk telecom such as the ok cashbag from sk energy and the gifticon service from sk telecom . they also hold a subsidiary ofelis which is a wedding consulting company . sk corporation c & c korean sk c & c or 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 . and the company is expanding its presence overseas . industries in its product portfolio include gis its erp national security & defense postal e government e learning postal and other areas . they also specialize in mobile commerce products and sk c