12. Martha Ingram ($4.6 billion)
Martha Ingram led the Ingram Industries from 1995 to 2008 before her sons took over. The company serves in printing and digital, distribution, entertainment, and waterway transportation business in United States.
Her late husband inherited the company from his family. Since he passed away, Martha and her sons have been in charge.
In 1996, she founded a spin-off company which serves in the computer distribution business. It is called the Ingram Micro.
The 80-years-old widow is now living in Nashville, Tennessee. She owns a total of $4.6 billion net worth. This put her as the 392th billionaire in the world and the 139th in United States.
