As U.S. momentum stocks take beating, some sectors benefit

By Ryan Vlastelica and David Gaffen NEW YORK (Reuters) – Investors in some of the past year's hottest U.S. stocks have been given a savage lesson in the risks of so-called "momentum trading". A group of 24 such companies compiled by Credit Suisse has lost $63 billion in market value, or almost 19 percent, so far in March. One of them, streaming video service Netflix, has declined on 15 of the last 17 trading days, while another, online travel service Priceline, is on pace to for its worst month in nearly two years, while Twitter on Wednesday sank below its November first-day closing price for the first time since December, when the company had publicly traded for less than a month. The sell off may well have further to go, investors warn.