Top Percentage Gainers and Losers as of 12pm 5/10/11 (FONR, TRAK, CKXE, CPE, FFHL MED, PTRY, GENE,BMTI, HEAT, PANL, USAT, HOLI, ITMN, VRML)

Best

1) Fonar (NASDAQ: FONR): Trading up 25.1% from yesterday's close to $2.72. Fonar reported a 15% increase in revenue to $8.7 million for the third quarter. Net income came in at $0.20 per share versus $7.5 million for the same period last year. Shares set a new 52-week high of $3.20 earlier in the session.

2) Dealer Track Holdings (NASDAQ: TRAK): Trading up 23.5% from yesterday's close to $26.29. Dealer Track reported Q1 earnings of $0.59 per share versus a loss of $0.06 per share for the same period last year. Adjusted net income came in at $0.18 per share versus estimates of $0.11 per share. Shares set a new 52-week high of $26.46 earlier in the session.

3) CKX (NASDAQ: CKXE): Trading up 22.7% from yesterday's close to $5.46. CKX is set to be acquired by Apollo Global Management LLC for $5.50 per share in cash. The deal is valued at $509 million.

4) Callon Petroleum (NYSE: CPE): Trading up 18.9% from yesterday's close to $7.34. Callon reported Q1 earnings of $0.12 per share versus estimates of $0.03 per share. Revenue came in at $25.4 million versus estimates of $24 million.

5) Fuwei Films (NASDAQ: FFHL): Trading up 18.6% from yesterday's close to $4.34. Fuwei Films reported Q1 earnings of $0.28 per share versus earnings of $0.003 (RMB 0.02) for the same period last year.

Other Notable Gainers

MEDIFAST (NYSE: MED): Trading up 14.6% from yesterday's close to $23.32.

The Pantry (NASDAQ: PTRY): Trading up 13.9% from yesterday's close to $18.28.

Genetic Technologies (NASDAQ: GENE): Trading up 12.6% from yesterday's close to $9.13.

Worst

1) BioMimetic Therapeutics (NASDAQ: BMTI): Trading down 34.6% from yesterday's close to $8.76. Augment, BioMimetic's bone graft product is to be the subject of a critical regulatory meeting. On Thursday, the U.S. Food and Drug Administration is to decide whether or not to recommend the approval of Augment. BioMimetic posted a loss of a $0.28 per share versus estimates of a $0.35 loss.

2) SmartHeat (NASDAQ: HEAT): Trading down 28% from yesterday's close to $2.27. SmartHeat posted a Q1 loss of $0.10 per share versus a loss of $0.05 for the same period last year. Sales came in 16% lower from a year ago at $7.89 million.

3) Universal Display (NASDAQ: PANL): Trading down 19.5% from yesterday's close to $45.57. Universal Display reported a Q1 loss of $0.08 per share versus estimates of a $0.03 loss.

4) USA Technologies (NASDAQ: USAT): Trading down 13% from yesterday's close to $2.21. USA Technologies reported Q3 sales of $5.5 million – a 50% increase for the same period last year. The company reported a loss of $0.11 per share versus a loss of $0.10 for the same period last year.

5) Hollysys Automation Technologies (HOLI): Trading down 11.2% from yesterday's close to $10.42.

Other Notable Losers

InterMune (NASDAQ: ITMN): Trading down 11.1% from yesterday's close to $38.41.

Vermillion (NASDAQ: VRML): Trading down 11.1% from yesterday's close to $3.50.