Benzinga's Top #PreMarket Gainers

Westport Innovations Inc. (NASDAQ: WPRT) shares gained 4.33% to $13.49 in pre-market trading after the company announced Q1 earnings results.

Avanir Pharmaceuticals, Inc. (NASDAQ: AVNR) soared 3.87% to $4.83 in the pre-market trading after dropping 6.63% on Thursday.

Intuitive Surgical (NASDAQ: ISRG) shares jumped 3.03% to $370.00 in pre-market trading after the company announced accelerated share repurchase, this morning.

Masco Corporation (NYSE: MAS) surged 2.19% to $20.54 in the pre-market session after Raymond James upgraded the stock to Strong Buy.

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