The silhouette of Drew Houston, chief executive officer and co-founder of Dropbox Inc., is seen walking on stage during an event in San Francisco.

Dropbox down nearly 10 percent after COO departs

David Paul Morris | Bloomberg | Getty Images The silhouette of Drew Houston, chief executive officer and co-founder of Dropbox Inc., is seen walking on stage during an event in San Francisco. Dropbox was down nearly 10 percent by the close on Friday, following its announcement on Thursday that chief operating officer, Dennis Woodside, will […]