Closing Bell: Humana Slumps on Deal Worries; U.S. Stocks Mixed

A sharp selloff in crude kept stocks mostly in the red, though optimism ahead of Friday's jobs reports kept losses to a minimum on Thursday. Oil closed at a two-month low after a disappointing read on weekly inventories. Humana (HUM) - Get Report shares tumbled their most in nearly four years on worries its planned purchase of Aetna (AET) won't pass regulatory muster. Officials from both companies will reportedly meet with the Department of Justice tomorrow to discuss antitrust issues. BioMarin Pharmaceuticals (BMRN) - Get Report soared on speculation Roche (RHHBY) could pursue a takeover. Shares spiked around nine percent, though the reports are so far unconfirmed. First Solar (FSLR) - Get Report tumbled after Deutsche Bank downgraded to HOLD from BUY. The firm said increased competition from Chinese suppliers is providing risk to margins, while company bookings growth has likely slowed. TheStreet's Keris Lahiff reports from Wall Street.