Top Percentage Gainers and Losers as of 2pm 5/04/11 (VSEA, ZSTN, GMCR, SGI, AMAT, WOLF, ACLS, MGM, VCLK, KNDI, SONS, ACAD, SWSH, CENX, QSFT, DVR, OPEN)

Best

1) Varian Semiconductor Equipment Associates VSEA: Trading up 51.3% from yesterday's close to $61.37. Varian is being acquired by Applied Materials AMAT for $63 per share in cash. The deal is valued at $4.9 billion.

2) ZST Digital Networks

ZSTN

: Trading up 22.9% from yesterday's close to $3.54. 3) Green Mountain Coffee Roasters

GMCR

: Trading up 20.5% from yesterday's close to $77.28. Green Mountain reported EPS of $0.48 versus $0.38 estimates. Revenue came in at $647.66 million versus $629.35 million estimates. Shares set a new 52-week high of $78.45 earlier in the session. 4) Silicon Graphics International

SGI

: Trading up 19.5% from yesterday's close to $19.69. Silicon Graphics reported EPS of $0.07 per share versus -$0.12 estimates. 5) Great Wolf Resorts

WOLF

: Trading up 17.8% from yesterday's close to $2.71. Great Wolf reported earnings of -$0.19 per share versus -$0.26 per share for the same period last year. The company lost $6 million in the first quarter versus a loss of $8.1 million for the first quarter of last year.

Other Notable Gainers

MGM Resorts

MGM

: Trading up 12.4% from yesterday's close to $14.21. MGM reported EPS of -$0.18 versus estimates of -$0.19. ValueClick

VCLK

: Trading up 12.2% from yesterday's close to $18.48. ValueClick reported earnings of $0.26 per share versus $0.18 estimates. Revenue came in at $116.5 million versus $113.66 million estimates. The company was upgraded from Hold to Buy at Needham. Axcelis Technologies

ACLS

: Trading up 13.7% from yesterday's close to $2.00.

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Worst

1) Kandi Technologies

KNDI

: Trading down 22.7% from yesterday's close to $2.11. Shares put in a new 52-week low of $2.00 earlier in the session. 2) Sonus Networks

SONS

: Trading down 18.3% from yesterday's close to $2.99. Sonus reported EPS of -$0.04 versus breakeven estimates. Revenue dropped 20 percent versus a year ago to $67.3 million. Sonus was cut from Buy to Hold by S&P Equity Research. 3) ACADIA Pharmaceuticals

ACAD

: Trading down 15.9% from yesterday's close to $2.28. Shares have fallen 31% since posting a 52-week high of $3.30 on April 26th. 4) Swisher Hygiene

SWSH

: Trading down 15.5% from yesterday's close to $6.75. A negative article from Seeking Alpha was published today. 5) Century Aluminum Company

CENX

: Trading down 15.6% from yesterday's close to $16.66. Century Aluminum reported earnings of $0.25 per share versus estimates of $0.28 per share.

Other Notable Losers

Quest Software

QSFT

: Trading down 11.2% from yesterday's close to $22.41. Quest reported earnings of $0.20 per share versus estimates of $0.28 per share. Revenue came in at $188.2 million versus $197.9 million estimates. Cal Dive International

DVR

: Trading down 11.5% from yesterday's close to $6.60. Cal Dive reported a loss of $0.20 per share versus estimates of a $0.09 per share loss. OpenTable

OPEN

: Trading down 13.5% from yesterday's close to $90.88. OpenTable is replacing its current CEO, Jeffrey Jordan, with its current CFO, Matthew Roberts. The company was upgraded from Perform to Outperform by Oppenheimer.