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|Born||6 February 1960|
|Occupation||Co-Founder, Non Executive Director (since April 2017) of Wilmar International|
|Known for||Indonesia's 12th wealthiest people (Dec 2020), 1196th world (Dec 2020)|
|Net worth||US$ 2 Billion (December 2020)|
|Spouse(s)||Rosa Taniasuri Ong|
Martua Sitorus (born 1960), also known as Thio Seng Hap (吴笙福), is a Chinese Indonesian business magnate and entrepreneur. He was once known as the fourth richest person in Indonesia (and #377 in the world), but had decreased to fifteenth by December 2018, according to Forbes. He and his business partner, Kuok Khoon Hong founded the Singapore-based Wilmar International (丰益国际), the largest palm oil producer in the world.
Wilmar's business activities include oil palm cultivation, oilseeds crushing, edible oils refining, sugar milling and refining, specialty fats, oleochemicals, biodiesel and fertilizers manufacturing and grains processing. It has over 300 manufacturing plants and an extensive distribution network covering China, India, Indonesia, United States and some 50 other countries.
Martua was born in Pematang Siantar, a town located in North Sumatra, Indonesia. After finishing high school, he continued to the University of HKBP Nomensen, Medan which was the largest city in North Sumatera to finish his economic degrees. During his teenager, Martua traded fish, when grown up he started his business as a palm oil and mesocarp trader.
Martua along with Kuok Khoon Hong, the nephew of Malaysia's richest tycoon Robert Kuok, founded Wilmar International Limited and by 1991 he owned 7.100 hectare of palm tree plantations, and also build his own palm oil refinery in North Sumatra. The Wilmar International business has grown rapidly; by 2013 Wilmar owns more than 50 other companies with 300 manufacturing plants around the world. Martua also owns London skycraper Aviva Tower and a hospital in Medan, Murni Teguh Memorial Hospital, which is named after Martua's mother, Murni Teguh. The hospital was launched on 12 December 2012 (12/12/2012).
Apart from Wilmar, Martua and his elder brother Ganda Thio co-founded Gama Corporation in 2011, which run property, cement plant and others variety business through subsidiary Gama Land and Semen Merah Putih. Gama itself refer to its founder name Ganda & Martua (Ga-ma). Gama Corp owns 64 floor Gama Tower which is located at Rasuna Said - Jakarta, Indonesia. Gama Tower also known as the tallest building in Indonesia.  Westin Hotel Jakarta branch are located on the top floors of this building above Gama Corporation office
- "Indonesia's 50 richest people". Forbes. Retrieved 28 December 2018. CS1 maint: discouraged parameter (link)
- "Martua Sitorus". Forbes. Retrieved 8 August 2012. CS1 maint: discouraged parameter (link)
- "Dari batak jadi terkaya di dunia". Retrieved 31 January 2013. CS1 maint: discouraged parameter (link)
- "Murni Teguh Memorial Hospital". Retrieved 31 January 2013. CS1 maint: discouraged parameter (link)
- Von Mayer, Wintress. “Two Explosions a World Apart: From Disaster Comes New Power.” AltEnergyMag. Oct. 6, 2015