Dropbox’s initial public offering is the largest tech stock debut in more than a year. : The DropBox logo is seen in this illustration photo July 28, 2017. (REUTERS/Thomas White/Illustration) Dropbox Inc.’s initial public offering, the largest tech stock debut in more than a year, was priced at $21 per share, sources familiar with the matter told Reuters on Thursday, above the raised price range. At $21, the San Francisco-based company will have a market cap of about $9.18 billion on a fully diluted share count.