Thai-Chinese businessman Chanchai Ruayrungruang has an estimated net worth of $2.9 billion as of November 2016 according to Forbes.

Chanchai Ruayrungruang is known to be the head of the privately-held company, the Reignwood Group. The group specializes in delivering luxury goods and services to the more affluent members of the society. Currently, the Reignwood Group manufactures Red Bull beverages in China, the sales agent for Bell Helicopter in China and manages the Pinewood Valley Golf Course in Beijing.

The Reignwood Group was founded by Chanchai Ruayrungruang in 1974. Initially, the company's activities only revolved around tourism, general trading and real estate development. Through time, the company has developed into a multinational company that holds investments in health and wellness, green industries, mining, energy, aviation, financial services, consumer goods, modern services, and real estates.