Morning Market Losers By: Benzinga via Benzinga July 06, 2015 at 09:56 AM EDT HORSEHEAD HOLDING CORP. (NASDAQ: ZINC) dropped 25.33 percent to $8.55 after the company issued an update on operations at its ... Read More >> Related Stocks: Aetna Allot Communications Clean Energy Fuels Humana Jd.com Inc ADR Silicom Ltd