Context: Ericsson ("Telefonaktiebolaget L. M. Ericsson") is a multinational networking and telecommunications equipment and services company headquartered in Stockholm, Sweden. The company offers services, software and infrastructure in information and communications technology (ICT) for telecommunications operators, traditional telecommunications and Internet Protocol (IP) networking equipment, mobile and fixed broadband, operations and business support services, cable television, IPTV, video systems, and an extensive services operation. Ericsson had 35% market share in the 2G/3G/4G mobile network infrastructure market in 2012., The Wallenberg family (known as The Wallenbergs or simply Wallenbergs) is a prominent Swedish family renowned as bankers, industrialists, politicians, bureaucrats, diplomats. 
The Wallenbergs are present in most large Swedish industrial groups, like Ericsson, Electrolux, ABB, SAS Group, SKF, AIK, Atlas Copco and more.
In 1990 and subsequent years, the "Wallenberg sphere" controlled nearly one-third of the GDP of Sweden., Investor AB is a Swedish investment company , founded in 1916 and still controlled by the Wallenberg family through their Foundation Asset Management company FAM . The company owns a controlling stake in several large Swedish companies with smaller positions in a number of other firms . At year - end 2013 it had a market value of 190.9 billion kronor ( € 21.4 billion , $ 29.4 billion ) , a discount to the Net Asset Value of 11.4 % ., AB Electrolux (commonly known as Electrolux) is a Swedish multinational home appliance manufacturer, headquartered in Stockholm. It is consistently ranked the world's second-largest appliance maker by units sold (after Whirlpool). Electrolux products sell under a variety of brand names (including its own), and are primarily major appliances and vacuum cleaners intended for consumer use. The company also makes appliances for professional use., SKF, Svenska Kullagerfabriken AB (Swedish: "Swedish ball bearing factory AB"), later "AB SKF", is a leading bearing and seal manufacturing company founded in Gothenburg, Sweden in 1907. The company manufactures and supplies bearings, seals, lubrication and lubrication systems, maintenance products, mechatronics products, power transmission products, condition monitoring systems and related services globally., Scandinavian Airlines System Aktiebolag, trading as SAS Group and SAS AB, is an airline holding company headquartered in the SAS Frösundavik Office Building in Solna Municipality, Sweden. It is the owner of the airlines Scandinavian Airlines, Blue1 and 20% of Widerøe. SAS used to own 19.9% of the now defunct Spanish airline Spanair. It also owns the aviation services companies SAS Business Opportunities, SAS Cargo Group, SAS Ground Services, and SAS Technical Services. It holds minority ownership of Air Greenland, Estonian Air, and Skyways Express. SAS Group is partially owned by the governments of Sweden, Denmark, and Norway, with a 21.4%, 14.3%, and 14.3% ownership, respectively. The remaining 50% is held by private owners, of which Foundation Asset Management at 7.6% is the only significant one. The company is listed on the Oslo Stock Exchange, the Stockholm Stock Exchange, and the Copenhagen Stock Exchange., Subject: investor ab, Relation: headquarters_location, Options: (A) denmark (B) gothenburg (C) internet (D) mobile (E) solna municipality (F) stockholm (G) sweden
Output: stockholm