Benzinga's Top #PreMarket Losers

Sirona Dental Systems, Inc. SIRO shares dipped 6.35 percent to $93.00 in pre-market trading. DENTSPLY International Inc. XRAY and Sirona Dental Systems reported that the companies will combine in an all-stock merger deal. Stifel Nicolaus downgraded Sirona Dental Systems from Buy to Hold. DENTSPLY International Inc. XRAY shares fell 5.52 percent to $51.35 in pre-market trading after the company announced its plans to buy Sirona Dental Systems. FedEx Corporation FDX shares tumbled 2.92 percent to $149.50 in pre-market trading after the company reported downbeat earnings for its fiscal first quarter and lowered its forecast for the full year. Patterson Companies, Inc. PDCO fell 1.59 percent to $45.30 in pre-market trading. Patterson Companies shares have surged 13.26 percent over the past 52 weeks, while the S&P 500 index has declined 1.17 percent in the same period. Monster Beverage Corporation MNST shares declined 1.48 percent to $130.52 in pre-market trading after gaining 0.24 percent on Tuesday.