Benzinga's Top #PreMarket Losers

Twitter TWTR shares dropped 22.54% to $51.10 in pre-market trading after the company reported Q4 results. UBS downgraded the stock from Neutral to Sell and cut the price target from $45.00 to $42.00 Atmel ATML dipped 6.23% to $7.68 in the pre-market session after the company reported downbeat Q4 results. General Motors Company GM dipped 3.77% to $33.91 after the company reported a weaker-than-expected Q4 profit. Facebook FB shares fell 1.43% to $61.30 in the pre-market trading after dropping 0.89% on Wednesday.