

The scrappy side projects, garage experiments, and weekend hobbies that unexpectedly grew into some of the most valuable companies in the world.
Curated by the Top10Grid editorial team. Rankings driven by community votes and updated daily.

Kevin Plank started sewing moisture-wicking shirts in his grandmother's basement while playing college football, selling them out of his car trunk to teammates.

Craig Newmark started an email list about San Francisco events as a personal hobby in 1995, which organically grew into the classifieds giant that gutted the newspaper industry.
Michael Kittredge melted crayons to make a candle as a Christmas gift for his mother in 1969 and neighbors offered to buy them, sparking a company later sold for $1.75 billion.
Michael Dell started upgrading and selling PCs from his University of Texas dorm room in 1984, building a direct-to-consumer model that disrupted the entire computer industry.
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Kevin Plank started sewing moisture-wicking shirts in his grandmother's basement while playing college football, selling them out of his car trunk to teammates.

Craig Newmark started an email list about San Francisco events as a personal hobby in 1995, which organically grew into the classifieds giant that gutted the newspaper industry.
Michael Kittredge melted crayons to make a candle as a Christmas gift for his mother in 1969 and neighbors offered to buy them, sparking a company later sold for $1.75 billion.
Michael Dell started upgrading and selling PCs from his University of Texas dorm room in 1984, building a direct-to-consumer model that disrupted the entire computer industry.
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