Judy Faulkner

Judy Faulkner founded medical-record software provider, Epic Systems, in a Wisconsin basement in 1979; it's now the largest company of its kind in America.

Faulkner, a computer programmer, is CEO of the $3.8 billion (2021 sales) company, of which she owns 47%.

Epic supports the medical records of over 250 million patients and is used by top medical centers such as Johns Hopkins and Mayo Clinic.

The company has never raised venture capital or made an acquisition, and develops all its software in-house.

Faulkner signed the Giving Pledge in 2015 and has agreed to eventually give 99% of her assets to a private charitable foundation.