Dropbox chief Drew Houston to join elite ranks of idea-to-IPO founders

Dropbox was last privately valued at about $10 billion, meaning Houston's stake was worth about $2.5 billion on paper

Drew Houston had once made some changes during his high school to computer games such as Starcraft so that it could run more smoothly on his friends’ computer. Since then, Houston, now 35, has taken a version of that same concept and turned it into Dropbox, an online file storage and collaboration company that has grown rapidly since its founding in 2007.

Last month, Dropbox filed to go public, and when it does Houston will become the newest member of a small club of tech founders who steered a start-up all the way to Wall Street. In the process,