Benzinga's Top Pre-Market Gainers

K12 LRN soared 13.66% to $24.30 in the pre-market trading. K12 reported a better-than-expected fourth-quarter profit. Vical VICL surged 9.28% to $4.12 in the pre-market session. Vical announced today a worldwide, nonexclusive license to Bristol-Myers Squibb Company BMY. Cliffs Natural Resources CLF added 2.41% to $41.60 in the pre-market session. Cliffs Natural Resources' PEG ratio is 1.09. Arena Pharmaceuticals ARNA moved up 1.79% to $8.51 in the pre-market session. Arena Pharmaceuticals shares have surged 464.87% over the past 52 weeks, while the S&P 500 index has gained 20.85% in the same period.