Here are the biggest percentage gainers and losers in pre-market trading among companies with a market cap between $50 million and $750 million:

Biggest percentage gainers:

• Multi-Fineline Electronix Inc (Nasdaq:MFLX), up 17.8% after the Anaheim, Calif.-based provider of flexible printed circuits reported a 45% boost in second-quarter sales.
• Gulfport Energy Corp (Nasdaq:GPOR), up 14.5%.
• Ceragon Networks Ltd (Nasdaq:CRNT), up 10.3%.

Biggest percentage losers:

• Synchronoss Technologies Inc (Nasdaq:SNCR), down 43.9% after posting a lower-than-expected quarterly profit and forecasting a weak second quarter.

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