|This article relies on references to primary sources. (April 2014)|
|Traded as||IDX: ISAT
|Headquarters||Jl. Medan Merdeka Barat 21
|Key people||Alexander Rusli, President Director & CEO
H.E. Sheikh Abdulla Mohammed S.A Al Thani, President Commissioner 
|Products||Cellular, Fixed Line and MIDI (Multimedia Data Internet) services|
|Owner(s)||Ooredoo Asia PTE LTD (65.00%)
Government of Indonesia (14.29%)
Skagen AS entities (5.42%)
|Subsidiaries||Indosat Mega Media (IM2) , Lintas Arta, SMT|
Indosat is one of Indonesia's largest telecommunication networks and services provider.
Indosat offers (prepaid and postpaid) mobile phone services (Mentari, IM3 and Matrix), fixed voice services (including International Direct Dialing (IDD)), fixed wireless and fixed telephone services. The company also provides Multimedia, Internet & Data Communication Services (MIDI).
As of 2012[update] the company holds around 21 percent of market share. It has around 50 million cellular subscribers. An Indonesian investment website stated that the company has lost a couple of percentage points in terms of market share on the mobile phone market in Indonesia in recent years. Onbile.com listed the company as the third largest telecommunications company in Indonesia in 2013, coming behind Telkomsel and XL Axiata.
Indosat has long history of ownership and change of purpose and goals from its establishment on 10 November 1967. After being bought by Indonesian government from foreign investment company, the company began as a commercial international telecommunications service provider (IDD) in September 1969. The company connected to Intelsat (International Telecommunications Satellite Organization), an earth station in Indonesia, to access Intelsat's Indian Ocean Region satellites until 1989.
The company's shares were registered on the Indonesia Stock Exchange on 19 October 1994 (code: ISAT). Its form of American Depositary Shares are registered at New York Stock Exchange (NYSE:IIT).
Between 1999 and 2000 the company went from Indonesia’s international telecommunications provider to an integrated telecommunications network and service provider. In 2001 the company signed an agreement with Telkom to eliminate its cross-shareholdings in several operating subsidiaries; among others Satelindo, Telkomsel, and Lintasarta.
In 2006 Indosat became a member of Conexus Mobile Alliance to enhance its international roaming and corporate mobile services for voice, video and data roaming. The alliance has a combined customer base of about 350 million mobile subscribers via its GSM/GPRS, W-CDMA networks and/or HSDPA networks.
As of 31 December 2013[update] the CEO is Alexander Rusli. The board of directors consists of Alexander Rusli, Fadzri Sentosa, and Stefan Carlsson. On late May 2014, Indosat launches new program to celebrate Indonesia Super League and FIFA World Cup 2014 namely Hiperbola 888 for Indosat IM3 & Indosat Mentari. The program is supported by some members of MNC Media Group, RCTI, MNCTV, Global TV, Sindo TV, and Koran Sindo, so, the advertising about this program can only be seen on all of television station which is a member of MNC Media.
- IndosatM2, internet services, Online & Mobile Advertising Platform, E-Payment, E-Commerce, E-Book, Apps store, Wi-Fi
- "Indosat: About Us".
- "Shareholders (as of 31 March 2014)". Indosat. Retrieved 30 April 2013.
- Indonesia-investments.com: Indosat company profile accessed on May 1, 2013
- Connexusmobile.com: Indosat accessed on May 1, 2013
- Onbile.com: Top Telecom Companies in Indonesia accessed on May 1, 2013
- Indosat.com: Corporate Profile History Accessed on May 1, 2013
- Connexusmobile.com: About Us accessed on May 1, 2013
- "Board of Directors". Indosat. Retrieved 30 April 2013.