NBCNews.comWearable Fitness Tracker Maker Fitbit Files for $100M IPOABC NewsFitbit, the maker of a popular line of wearable fitness-tracking devices, on Thursday filed for an initial public offering worth up to $100 million. Fitbit's watch-sized devices can track how many steps a wearer takes and estimate how many calories ...CompaniesFitness tracker Fitbit files for IPOFinancial TimesWearable fitness tracking device maker Fitbit files for IPOReutersFitbit Files for U.S. IPO of Fitness-Tracking Device MakerBloombergtất cả 50 bài viết »