The Siam Cement Public Company Limited is the largest and oldest cement and building material company in Thailand and Southeast Asia. In 2016, SCG was also ranked as the second largest company in Thailand and the 604th largest public company in the world by Forbes. The company is SET50 and SETHD-listed and an industry benchmark. The company's major shareholder is King Vajiralongkorn, which owns 30 percent of Siam Cement's shares.