Benzinga's Top #PreMarket Gainers

shares gained 20.62% to $14.50 in the pre-market trading session after rising 2.12% on Monday.

shares climbed 10.98% to $12.84 in pre-market trading after jumping 67.68% on Monday. Stifel Nicolaus upgraded Builders FirstSource from Hold to Buy

shares surged 9.16% to $104.99 in pre-market trading following the release of new Epidiolex data and price target raise.

gained 7.14% to $3.45 in pre-market trading. Flotek Industries and Solazyme announced strategic agreements to develop and market advanced drilling fluid technologies.

shares rose 3.02% to $95.75 in pre-market trading. Zillow will host conference call today to issue 2015 forecast and discuss Trulia integration progress.