Bangkok Expressway and Metro Public Company Limited 

Bangkok Expressway and Metro Public Company Limited (BEM), along with its affiliated companies, specializes in the development and oversight of expressways and urban mass transit rail systems across Thailand. Its business activities are organized into four primary divisions: Expressway, Rail, Commercial Development, and miscellaneous operations. BEM is entrusted with managing key infrastructure, including the Si Rat, Si Rat - Outer Ring Road, and Udon Ratthaya Expressways, as well as the MRT Blue Line and MRT Chalong Ratchadham Line projects. Beyond its core transportation mandate, the company also engages in commercial ventures linked to its expressway facilities. Additionally, it offers services such as retail space leasing, advertising, and telecommunication solutions within its underground train stations and along its expressway routes. Established in 1998, Bangkok Expressway and Metro Public Company Limited maintains its headquarters in Bangkok, Thailand.