Top Percentage Gainers and Losers as of 12pm 4/28/11 (LOOP, CSGP, GFRE, CRR, FTNT, HRZ, OMX, HHS, TER, AKAM, FOE)

2) Gulf Resources

: Trading up 17.9% from yesterday's close to $3.30. Gulf Resources disclosed additional financial information in response to allegations of fraudulent SEC filings. 3) Carbo Ceramics

: Trading up 16.1% from yesterday's close to $164.46. Carbo announced better-than-expected Q1 earnings. The company stated that it was the best quarter in its history. 4) Fortinet

: Trading up 15% from yesterday's close to $47.96. Fortinet reported better-than-expected first quarter earnings yesterday afternoon. The company posted revenue of $93.3 million versus estimates of $86.9 million. EPS came in at $0.17 per share versus $0.14 per share estimates. 5) Horizon Lines

: Trading up 14.7% from yesterday's close to $2.18. Horizon is set to announce earnings on April 29th. Shares had been up as much as 35% from yesterday's close earlier in the session.

1) Officemax

: Trading down 18.6% from yesterday's close to $10.16. Officemax reported disappointing earnings this morning. Ravi Saligram, Officemax CEO, stated he was “very disappointed” with Q1 results. The company noted a substantial cut in its domestic contract business, low growth for its domestic retail stores, and tightening margins as reasons for the weak performance. 2) Harte-Hanks

: Trading down 18.4% from yesterday's close to $9.73. Harte-Hanks reported disappointing earnings before the bell today. Q1 earnings came in at $0.12 per share versus estimates of $0.17 per share. 3) Teradyne

: Trading down 14.9% from yesterday's close to $15.58. Teradyne issued a weaker-than-expected forecast. The company was cut from Overweight to Neutral by Piper Jaffray. 4) Akamai Technologies

: Trading down 14.2% from yesterday's close to $35.15. Yesterday, Akamai announced that it will be renewing some of its contracts at lower prices, as well as lowering volume on others. 5) Ferro

: Trading down 12.9% from yesterday's close to $14.54. Ferro reported earnings yesterday after the bell. The company beat expectations, but shares have plunged since the opening bell.