Turkcell is the leading mobile phone operator of Turkey

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

, based in Istanbul

Istanbul

Istanbul , historically known as Byzantium and Constantinople , is the largest city of Turkey. Istanbul metropolitan province had 13.26 million people living in it as of December, 2010, which is 18% of Turkey's population and the 3rd largest metropolitan area in Europe after London and...

. The company has 34.1 million subscribers as of June 30th, 2011.
In February 1994, Turkcell started Turkey

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

's first GSM network. In 2011 it has a market share of 54%. Its competitors are Vodafone

Vodafone

Vodafone Group Plc is a global telecommunications company headquartered in London, United Kingdom. It is the world's largest mobile telecommunications company measured by revenues and the world's second-largest measured by subscribers , with around 341 million proportionate subscribers as of...

  with a market share of 27% and Avea

Avea

AveA , the sole GSM 1800 mobile operator of Turkey, was founded in 2004 and has reached a nationwide customer base of 12.4 million by the end of June 2009.TT&TİM İletişim Hizmetleri A.Ş...

 with a market share of 19%.

Turkcell is the first Turkish company to be listed on the New York Stock Exchange

New York Stock Exchange

The New York Stock Exchange is a stock exchange located at 11 Wall Street in Lower Manhattan, New York City, USA. It is by far the world's largest stock exchange by market capitalization of its listed companies at 13.39 trillion as of Dec 2010...

 (NYSE)(TKC), where its shares have been traded since July 11, 2000 along with trading on the Istanbul Stock Exchange

Istanbul Stock Exchange

The Istanbul Stock Exchange is the only corporation in Turkey for securities exchange established to provide trading in equities, bonds and bills, revenue-sharing certificates, private sector bonds, foreign securities and real estate certificates as well as international securities. The ISE was...

 (IMKB).

Turkcell's shareholder structure is as follows: 51% is held by Turkcell Holding A.Ş., 0.05% by Çukurova Holding A.Ş., 13.07% by Sonera Holding B.V.

TeliaSonera

TeliaSonera AB is the dominant telephone company and mobile network operator in Sweden and Finland. The company has operations in other countries in Northern, Eastern Europe, Central Asia and Spain, with a total of 150 million mobile customers...

, 1.18% by MV Holding A.Ş., 0.01% by others, and the free float is 34.69%.