Benzinga's Top Pre-Market Losers

MAKO Surgical

shares dropped 40.88% to $14.55 in pre-market trading. MAKO Surgical now expects to sell 42 to 48 RIO systems in 2012, versus its earlier forecast of 52 to 58 RIO system sales. James River Coal Co

dipped 18.12% to $2.35 in the pre-market session. James River Coal's PEG ratio is -0.08. Advanced Micro Devices

dipped 9.43% to $5.09 in the pre-market session. Advanced Micro Devices cut its second-quarter revenue forecast. Wolverine World Wide

shares fell 8.69% to $35.00 in the pre-market trading. Wolverine World Wide reported a 14% drop in its fiscal second-quarter earnings.