Thailand's largest private company and one of the world's largest conglomerates. The company describes itself as having eight business lines covering 13 business groups. As of 2020  the group has investments in 21 countries.

It owns controlling stakes in the world's largest producer of feed, shrimp, and a global top-three producer of poultry, pork, among other agricultural produces. It also operates Southeast Asia's largest retail business by revenue. In the telecommunications sector, it is one of the largest telecom firms in Southeast Asia with over 25 million mobile customers.   

With some 200 business subsidiaries in mainland China , they're known in China as "Zhèng Dà" (正大). When China opened up its economy in 1978, they were the very first foreign investor in the country and became the first foreign company registered in the special economic zone of Shenzhen, Guangdong. The company is the single largest investor in Mainland China today commanding over fifth of China's entire feed meal market.