Benzinga's Top Pre-Market Losers

First Solar Inc

shares fell 5.08% to $37.35 in the pre-market trading. The 2013 guidance for First Solar sets full-year earnings between $4 and $4.50 per share on net sales of $3.8 billion to $4 billion. Family Dollar Stores Inc

dipped 4.68% to $57.00 in the pre-market Family Dollar Stores has lowered its guidance for comparable-store sales for the current quarter, while also revising its full-year profit outlook downward. Tenet Healthcare Corp

shares dropped 4.07% to $41.75 in pre-market trading. Tenet Healthcare's shares fell after market close on Tuesday following the lackluster profit outlook issued by Health Management Associates. Fastenal Co

dipped 2.71% to $49.50 in the pre-market session. Fastenal has reported an 8.8% increase in its first-quarter earnings.