Benzinga's Top Pre-Market Losers

ONYX Pharmaceuticals Inc (NASDAQ: ONXX) shares fell 8.93% to $37 in the pre-market trading. ONXX reported that the FDA has granted Standard Review designation to the New Drug Application for carfilzomib for the treatment of relapsed and refractory multiple myeloma.

Diamond Foods Inc (NASDAQ: DMND) dipped 4.04% to $38.92 in the pre-market session. DMND shares have dropped 22.86% over the past 52 weeks, while the S&P 500 index has gained 1.19% in the same period.

Salesforce.com Inc (NYSE: CRM) dipped 2.13% to $121.24 in the pre-market session. CRM's trailing-twelve-month operating margin is -1.39%.

Valero Energy Corporation (NYSE: VLO) moved down 1.89% to $20.75 in the pre-market session. VLO's trailing-twelve-month profit margin is 1.43%.