Benzinga's Top Pre-Market Losers

Tower Group International (NASDAQ: TWGP) dipped 26.72% to $5.43 in the pre-market session after the company reported that it expects to add nearly $365 million to its loss reserves and will take a non-cash goodwill impairment charge of $215 million.

Clean Energy Fuels (NASDAQ: CLNE) dipped 6.08% to $12.20. Clean Energy's PEG ratio is -1.35.

Xerox (NYSE: XRX) shares fell 2.31% to $10.16 in the pre-market trading after the company reported that the SEC is probing some accounting practices at Affiliated Computer Services.

AudioCodes (NASDAQ: AUDC) shares dropped 2.30% to $6.80 in pre-market trading after Oppenheimer downgraded the stock from Outperform to Market Perform.