It is a majority-owned subsidiary of BTS Group Holdings (BTSG, previously known as Tanayong), and also operates the Bangkok BRT and the Gold Line.
BTSC was founded by Keeree Kanjanapas in 1992 to serve as Tanayong's concession operator for Bangkok's then-planned elevated rapid transit system.
It incurred heavy losses following the 1997 Asian financial crisis, and underwent business rehabilitation and debt restructuring from 2006 to 2008.
In 2010, Tanayong renamed to BTSG and reacquired a 94.6 percent stake in BTSC, becoming the majority owner.
It is the sole concessionaire of the original BTS network (including stations from Mo Chit to On Nut on the Sukhumvit Line and National Stadium to Saphan Taksin on the Silom Line), of which the company was the sole investor, and operates extensions to the lines under concession agreements from the Bangkok Metropolitan Administration (via its investment arm the Krungthep Thanakom company) and the Mass Rapid Transit Authority of Thailand (MRTA).