Morning Market Losers

Prana Biotechnology (NASDAQ: PRAN) shares tumbled 70.79% to $2.88 on failed Phase 2 Alzheimer's trial results.Clean Diesel Technologies (NASDAQ: CDTI) dipped 10.90% to $3.76 on Q4 results. Clean Diesel Tech posted a Q4 loss of $0.27 per share, versus analysts' expectations for a loss of $0.06 per share.MannKind (NASDAQ: MNKD) shares fell 8.90% to $4.40 trading after dropping 7.12% on Friday. Guanwei Recycling (NASDAQ: GPRC) shares dropped 7.12% to $3.00 after the company reported full-year 2013 results. Guanwei Recycling's 2013 net income slipped 18.05% to $9,699,497.Ocean Bio-Chem (NASDAQ: OBCI) shares fell 6.73% to $2.91 after the company reported Q4 results. Ocean Bio-Chem reported its Q4 earnings of $0.04 per share on revenue of $7.80 million.GenCorp (NYSE: GY) shares fell 3.76% to $17.90 after the company reported Q1 results. GenCorp reported a Q1 loss of $0.03 per share.BlackBerry (NASDAQ: BBRY) slipped 3.51% to $8.11 after falling 7.07% on Friday. Analysts at Credit Suisse downgraded BlackBerry from neutral to underperform and lowered the target price from $7 to $6. General Motors Company (NYSE: GM) shares declined 1.76% to $34.12. Federal regulators twice declined to open formal investigations into GM cars with faulty ignition switches, according to the Wall Street Journal.