6. THAI LEE

$4.1 billion

SOURCE: IT provider

AGE: 63 • RESIDENCE: Austin, TX

SELF-MADE SCORE: 9

IT provider SHI International, which she cofounded in 1989 and runs as CEO, posted record sales of $12.3 billion in 2021, up 10% from 2020, which was another record year. Demand for IT security solutions as well as support for expanding remote and hybrid working models were key drivers of growth.