Question: Where are the headquarters of one of the six largest companies in the world in 2016 that owns 15 percent of the shares in Abu Dhabi Gas Industries Limited?

Context articles: Team Abu Dhabi
Abu Dhabi Securities Exchange
2016 Abu Dhabi Grand Prix
Abu Dhabi Gas Industries Limited
Abu Dhabi Aviation
Abu Dhabi Festival
Royal Dutch Shell
Khaled Salmeen
Dalma Mall
Capital Gate

Team Abu Dhabi is a team competing in the World Rally Championship.
 Team Abu Dhabi was set up in 2007 with the support of the Abu Dhabi Tourism Authority (ADTA) with the purpose of giving drivers from Abu Dhabi the opportunity to compete internationally.
 During 2007 ADTA began sponsoring the Ford World Rally Team, in a deal that saw Emirati driver Khalid Al Qassimi competing for the team.
 In 2011 Team Abu Dhabi has entered as a separate 'WRC Team'.
Abu Dhabi Securities Exchange (A.D.X.) (formerly Abu Dhabi Securities Market) [ADSM] (Arabic: سوق أبوظبي للأوراق ألمالية) is a stock exchange in Abu Dhabi, United Arab Emirates (UAE).
 It was established on 15 November 2000 to trade shares of UAE companies.
 There are trading locations in Abu Dhabi, Al Ain, Fujeirah, Sharjah, and Ras Al Khaimah.
 The Dubai Financial Market (DFM) is a different exchange that trades shares of other public UAE companies but investors can also trade ADSM shares with some of the brokers based at DFM.
The 2016 Abu Dhabi Grand Prix (formally known as the 2016 Formula 1 Etihad Airways Abu Dhabi Grand Prix) was a Formula One motor race held on 27 November 2016 at the Yas Marina Circuit in Abu Dhabi, United Arab Emirates.
 The race was the final round of the 2016 season and determined the 2016 World Drivers' Championship.
 It marked the eighth running of the Abu Dhabi Grand Prix and the eighth time that the race had been run as a World Championship event since the inaugural season in .
Abu Dhabi Gas Industries Limited (GASCO) is a natural gas producing company of Abu Dhabi, UAE.
 It is a subsidiary of the Abu Dhabi National Oil Company (ADNOC), which owns 68 percent stake in the company.
 Other shareholders are Shell Abu Dhabi (15 percent), Total SA (15 percent) and Partex (2 percent).
 The company was established in 1975.
Abu Dhabi Aviation Co. (Arabic: شركة طيران أبوظبي‎ ‎ ) () is an airline based in Abu Dhabi, United Arab Emirates.
 It serves oil-fields and economic facilities in the United Arab Emirates and other Arab states.
 Its main base is Abu Dhabi International Airport.
 Abu Dhabi Aviation is the largest commercial helicopter operator in the Middle East, operating 58 helicopters (15 AgustaWestland AW139s, 24 Bell 412s, 19 Bell 212s), and 3 fixed-wing aircraft (DHC-8).
 The company employs over 900 personnel, including 150 pilots and 340 aircraft maintenance engineers.
 The bulk of the company's business activity is in support of Abu Dhabi offshore oil and engineering and construction companies.
 Other business activities include medical evacuation, survey, photography and charter.
 All aerial spraying of crops in the UAE and the majority of aerial spraying in Oman is carried out by ADA.
Abu Dhabi Festival is an annual cultural festival in Abu Dhabi, United Arab Emirates; established in 2004.
 The festival is presented by the Abu Dhabi Music & Arts Foundation.
 The event has been held under the patronage of His Highness General Sheikh, Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces, Sheikh Nahayan Mabarak Al Nahayan, since 2007.
 It was originally under the patronage of HE Sheikh Abdullah bin Zayed Al Nahyan, then Minister of Information and Culture.
 Abu Dhabi Festival is the largest classical arts event in the UAE.
Royal Dutch Shell plc (, ), commonly known as Shell, is a British–Dutch multinational oil and gas company headquartered in the Netherlands and incorporated in the United Kingdom.
 It is one of the six oil and gas "supermajors" and the sixth-largest company in the world measured by 2016 revenues (and the largest based in Europe).
 Shell was first in the 2013 Fortune Global 500 list of the world's largest companies; in that year its revenues were equivalent to 84% of the Netherlands' $556 billion GDP.
Khaled Salmeen (Arabic: خالد سالمين) (born 1974) is chairman of Abu Dhabi Terminals (ADT), and a leading advisor to Abu Dhabi Ports in the emirate of Abu Dhabi.
 An Emirati national, Salmeen has spearheaded and led a number of major infrastructure projects in the emirate.
 For five years, in the role of CEO and managing director of Khalifa Industrial Zone Abu Dhabi (Kizad), Salmeen played a central role in helping to develop the emirate's industrial and manufacturing economy - one of the main goals set out by the Abu Dhabi government's Abu Dhabi Economic Vision 2030 to diversify the local economy away from oil and gas.
Dalma Mall is a large shopping mall located in Abu Dhabi.
 The mall is prominently situated on the Abu Dhabi–Tarif–Al Ain highway, opposite Mohammed Bin Zayed City and at the heart of Abu Dhabi's growth corridor.
 A short distance from Maqta Bridge and Abu Dhabi International Airport, Dalma Mall is one of Abu Dhabi’s shopping and tourist destination and features over 400 stores.
 The mall opened in 2010.
Capital Gate is a skyscraper in Abu Dhabi adjacent to the Abu Dhabi National Exhibition Centre designed with a striking lean.
 At 160 m and 35 stories, it is one of the tallest buildings in the city and inclines 18° to the west.
 The owner and developer of Capital Gate is Abu Dhabi National Exhibitions Company.
 The tower (also known as the Leaning Tower of Abu Dhabi) is the focal point of the Capital Center/Abu Dhabi National Exhibition Centre master development.