1. DIANE HENDRICKS

$12.2 billion

SOURCE: Building supplies

AGE: 75 • RESIDENCE: Afton, WI

SELF-MADE SCORE: 9

Hendricks has benefited from a pandemicinspired residential housing boom. Her fortune has grown by more than $1 billion this past year, thanks to record sales at ABC Supply, the wholesale building supplies distributor she cofounded with her husband (d. 2017). Its sales hit nearly $15 billion, up from $12.1 billion in 2020.