Chinese entrepreneur Zhang Yin has an estimated net worth of $3.05 billion in 2013. She is best known as the founder and director of Nine Dragons Paper Holdings Limited.  The company specializes in purchasing scrap paper from the U.S. then import it to China. Eventually, the paper is made into cardboard in making boxes used to export goods. Today, Nine Dragons Paper Holdings Limited is considered as the biggest paper maker in China.

Along with her husband, Ming Chung Liu, she co-founded America Chung Nam, a paper exporting company which was named as the #1 paper exporting company in the U.S. since 2001. It is also the largest overall paper exporter to China. In 1995, she co-founded Nine Dragons Paper Holdings Limited with her younger brother Zhang Cheng Fei and her husband.

While Zhang Yin makes most of the strategic decisions for the company, her husband serves as the chief executive officer while her brother takes charge of the general management. On the other hand, his son, Lau Chun, serves as the non-executive director.