Benzinga's Top #PreMarket Losers

Groupon GRPN shares fell 13.03% to $8.94 in the pre-market trading after the company expected to post a loss for the first quarter. Analysts at RBC Capital downgraded the stock from sector perform to underperform and lowered the price target from $11 to $7. Blucora BCOR shares dropped 3.80% to $20.75 in pre-market trading after the company issued a weak Q1 forecast. Raptor Pharmaceuticals RPTP dipped 3.38% to $16.56 after gaining 14.88% on Thursday. Marvell Technology Group MRVL dipped 2.20% to $15.77 in the pre-market session after the company reported Q4 results and named Michael Rashkin as its Chief Financial Officer.