Here's how this year's biggest US IPOs have performed

It has been a busy year for initial public offering in America. Through the end of September, there have been 173 IPOs, raising $45.7 billion. The value raised in the first three quarters was 46.5% greater than the same period last year, and more than three times that of 2016, according to PwC track of data.
The strong IPO dynamic has been driven by "continual period of very strong market conditions," David Ethridge, US IPO Services Leader at PwC, told Business Insider on Friday, adding that co