30 Under 30: America's Coolest Young Entrepreneurs

Maddie Bradshaw, M3 Girl Designs
Courtesy of M3 Girl Designs
2 of 17

No. 28 Maddie Bradshaw, M3 Girl Designs

Age: 13
Location: Dallas
2008 Revenue: $1.6 million
Employees: 25
Founded: 2006
Website: www.m3girldesigns.com
Facebook: www.facebook.com/pages/Snap-Caps-by-m3-girl-designs/91805695911
Twitter: www.twitter.com/m3girldesigns

What she does: Designs and sells thousands of Snap Caps -- colorful bottle caps that can be worn as charms on necklaces, bracelets, and hairpins