PT. Hutama Karya
Hutama Karya, PT previously known as private Dutch company Hollandsche Beton Maatschappij (HBM) which established on Hindia Belanda Govermance. Based on government rule, Dutch and foreign company need to change to national company, on 1961 its change to PN Hutama Karya. In 1971, PN Hutama Karya change into PT. Hutama Karya. In 1973 with the requirement as Persero company fulfill, then known as PT Hutama Karya (Persero).

PT. Indominco Mandiri, PT. Kitadin Corporation, PT. Trubaindo which all belongs to Banpu Group is the largest coal producer and distributor in Thailand. Banpu Group has various coal mines in Thailand, Indonesia, and China. Total production from Banpu's operations is approximately 15million tones in 2005, over 18million in 2006 and over 20million in 2007.

ASL Marine Holding Ltd, a leading company marine based company, established in July 2003. This Group established a reputation for building quality vessels as well as repairing vessels whilst having competitive pricing and excellent delivery performance.

PT. Paiton Energy Co. is a 1,290 MW coal-fired plant in Indonesia's East java province, amid growing electricity demand in the country. Paiton Energy, which started operating in 1999, owns and operates the Paiton coal-fired power plant. The company is jointly owned by affiliates of Edison Mission Energy, Mitsui & Co.(MITSY), General Electric Capital Corp.(GEX.XX), and Indonesia's PT. Batu Hitam Perkasa.

PT. Wijaya Karya Intrade (WIKA INTRADE) is a subsidiary of PT WIKA which established from division merger between Metal Product Division and Trading Division of PT. WIKA. It now comprises three strategic business units ( SBU), as follows : General Trading, Metal and Energy Conversion.

PT. Kalimantan Prima Persada (KPP) is a subsidiary of PT. Astra Internasional, one of the largest and most respected companies in Indonesia. During 2007, Indonesia Power(IP) bought over 10millions of KPP coal.

PT. Bukit Baiduri Energi (BBE) is situated in the heart of the country's oldest coal mining area along the Mahakam River in East Kalimantan, Indonesia, where exploitation of coal began in 1849 by the Dutch Company- NV. Oast Borneo Mattchappi. PT. Bukit Baiduri Energi holds 5 adjoining Mining Rights, covering an area of more than 7,000hectares. The current coal resources stands at 12.6 million tones while latest exploration work confirmed more than 28.0 million tones of coal resources. The coal is stacked at Merandai Port(BBE'2 own port) along Mahakam River.

PT. (Persero) Bhanda Ghara Reksa(BGR) which start operating 11 April 1977, is a company owned by the Indonesia Government. They are in general warehousing, freight forwarding, custom clearance, surveyor, cargo management and pest control.