WBA - Hot Stocks: AMD downgrade; WBA earnings; MASI falls on preliminary results; VIPS buyback

Advanced Micro Devices (NASDAQ:AMD) represented one of the biggest names moving in Thursday's pre-market trading. Shares of the semiconductor maker experienced selling pressure following an analyst's downgrade. Walgreens Boots Alliance (WBA) pushed lower as well, despite the release of better-than-expected quarterly results. Slowing growth sparked a cautious reaction from investors. Financial figures also weighed on Masimo (MASI), which fell in the wake of preliminary results. On the other side of the spectrum, Vipshop (VIPS) gained ground on a stock repurchase plan.  Decliners Advanced Micro Devices (AMD) lost ground in pre-market action, dropping about 2% following a downgrade from Barclays. The firm cut its rating on AMD to Equal Weight from Overweight, citing concerns about growth rates next year. "We don't have a smoking gun pointing to a correction underway in any of these markets, but it's very clear to us that all 3 segments are running at elevated levels," analyst

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Hot Stocks: AMD downgrade; WBA earnings; MASI falls on preliminary results; VIPS buyback