Morning Market Losers By: Benzinga via Benzinga March 18, 2015 at 09:55 AM EDT Willbros Group Inc. (NYSE: WG) shares tumbled 67.70% to $1.77. Willbros Group announced that it is filing a form 12b-25 ... Read More >> Related Stocks: Adobe Systems Astronova Inc Navigator Holdings Nektar Therapeutics RSP Permian, Inc. Common Stock