Teradyne, Inc.TER fell 10.8 percent to $37.02 in pre-market trading after the company issued downbeat Q2 guidance.
Edwards Lifesciences Corporation EWfell 9.2 percent to $122.29 in pre-market trading. Edwards Lifesciences reported better-than-expected results for its first quarter, but issued weak earnings guidance for the second quarter.
New Gold Inc.NGD fell 8.8 percent to $2.30 in pre-market trading after rising 4.13 percent on Tuesday.
Gold Fields Limited (ADR)GFI fell 8.6 percent to $3.61 in pre-market trading.
Natus Medical Incorporated BABYfell 8.2 percent to $32.95 in pre-market trading after the company issued weak forecast for the second quarter.
Atossa Genetics Inc.ATOS shares fell 7.9 percent to $3.50 in pre-market trading after climbing 27.09 percent on Tuesday.
Bright Scholar Education Holdings Limited BEDUshares fell 6.7 percent to $13.58 in pre-market trading after reporting Q1 results.
Sangamo Therapeutics IncSGMO fell 5.9 percent to $16.75 in pre-market trading following announcement of a $200 million common stock offering.
Foresight Autonomous Holdings Ltd FRSXshares fell 5.7 percent to $3.29 in pre-market trading after declining 3.32 percent on Tuesday.
Euronav NV EURNfell 4.8 percent to $8.40 in pre-market trading.
Limelight Networks, Inc.LLNW shares fell 4.3 percent to $4.69 in pre-market trading.
Gaming and Leisure Properties IncGLPI shares fell 4.1 percent to $32.92 in pre-market trading after the company issued downbeat quarterly results and reported the retirement of CFO William Clifford.