Benzinga's Top #PreMarket Losers

Jabil Circuit

shares fell 17.85% to $16.20 in the pre-market trading after the company reported downbeat fiscal first-quarter results and issued a weak outlook for its second quarter. Citigroup downgraded the stock from Neutral to Sell and lowered the target price from $24 to $14. Tower Group International

dipped 12.72% to $3.43 after the company announced the sale of its 10.7% equity stake in Canopius Group Limited. Compass Point downgrades the stock from Buy to Neutral. Onconova Therapeutics

dipped 9.95% to $14.75 in the pre-market session after the company announced the discontinuation of the Phase 3 ONTRAC study of intravenous (IV) rigosertib plus gemcitabine in front-line metastatic pancreatic cancer. Gogo

shares dropped 6.13% to $28.85 in pre-market trading after the company announced Ripplewood distribution and director resignations.