Top Percentage Gainers and Losers as of 12pm 06/08/11

1) China-Biotics

: Trading up 27.1% from yesterday's close to $6.14. Shares of China-Biotics set a 52-week low of $4.65 in yesterday's session. The stock has lost 49.7% in the last 14 trading sessions. 2) Layne Christensen

: Trading up 13.9% from yesterday's close to $31.23. Layne Christensen reported Q1 earnings of $0.66 per share versus analyst estimates of $0.28 per share. Revenue came in 16% higher than the same period last year to $36.7 million. The stock has broken above its 50- and 200-day simple moving averages (one year daily chart) in today's action. 3) Bob Evans Farms

: Trading up 8.9% from yesterday's close to $32.15. Bob Evans was raised from Hold to Buy at Miller Tabak. Shares broke above their 50- and 200-day simple moving averages (one year daily chart) in today's session. 4) Pharmasset

: Trading up 8.5% from yesterday's close to $117.50. The company announced plans to test its hepatitis C treatment

as a stand-alone therapy. Shares of Pharmasset had traded up as high as $135.92 earlier in the session – a new 52-week high. 5) Ulta Salon, Cosmetics & Fragrance

: Trading up 8.2% from yesterday's close to $53.68. Ulta reported Q1 earnings of $0.37 per share versus estimates of $0.31 per share. Revenue came in at $386 million versus estimates of $382 million.

Sky-mobi

: Trading up 6.8% from yesterday's close to $7.09. A positive report by GlobalEquityReporter.com was published today highlighting Sky-mobi. The report can be found

QuickLogic

: Trading up 8% from yesterday's close to $2.80. NCI Building Systems

: Trading up 7.5% from yesterday's close to $10.60.

1) QuinStreet

: Trading down 21.5% from yesterday's close to $11.51. The company announced that it is expecting FY12 sales of $455 to $475 million versus analyst estimates of $480.1 million.QuinStreet was cut from Buy to Hold at Stifel Nicolaus. The company was also cut from Buy to Neutral at Bank of America

. 2) Cogo Group

: Trading down 14.9% from yesterday's close to $5.39. Cogo was cut from Buy to Neutral at Ticonderoga. Shares set a new 52-week low of $5.06 in today's session. 3) Ciena

: Trading down 13.5% from yesterday's close to $20.90. Ciena reported a Q2 loss of $0.24 per share versus estimates of a $0.11 loss. Sales came in at $417.9 million versus estimates of $428.19 million. 4) Renren

: Trading down 11.9% from yesterday's close to $10.71. Shares started out the session in positive territory but came under heavy selling pressure starting at 9:55am. The stock set an all time low of $10.40 earlier in the day. 5) MGIC Investment

: Trading down 11.6% from yesterday's close to $6.42. MGIC released its monthly operating statistics earlier this morning.

Feihe International

: Trading down 10.7% from yesterday's close to $7.25. Impax Laboratories

: Trading down 10.5% from yesterday's close to $21.03. Westport Innovations

: Trading down 10.3% from yesterday's close to $20.97.