26. NEERJA SETHI $1 billion  SOURCE: IT consulting, outsourcing AGE: 66 • RESIDENCE: Fisher Island, FL SELF-MADE SCORE: 

Sethi and husband Bharat Desai cofounded IT consulting and outsourcing firm Syntel in 1980 from their apartment in Troy, Michigan. In 2018, the couple sold it to French IT firm Atos SE for $3.4 billion. Sethi did not join Atos after the acquisition and has kept a low profile since.