athenahealth, Inc. A Stock Market Leader in Thursday’s Trading Action

Through most of the trading day on Thursday, September 8, 2011, the Dow (NYSE:DIA) is down 125 points to 11,289, the NASDAQ (NASDAQ:QQQ) is down 27 points to 2,521 and the S&P500 (NYSE:SPY) is down 14 points to 1,183. Here are some of today’s biggest gainers by price.

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Shares of athenahealth, Inc. (NASDAQ:ATHN) are trading at $62.91, up $3.83 (+6.5%) from the previous close of $59.08. athenahealth is showing very positive signs of the high growth health technology improvements they are doing in the healthcare industry, primarily with digitizing health records to further improve communication among doctors.

Stock Price Performance: From June 13, 2011, to September 7, 2011, the stock price had risen $19.81 (50.4%) from $39.27 to $59.08. The stock price saw one of its best stretches over the last year between June 30, 2011 and July 8, 2011 when shares rose for six straight trading days, rising 14.2% (+$5.83). It saw one of its worst periods between August 15, 2011 and August 19, 2011 when shares fell for five straight trading days, falling 10% (-$5.53).

Valero Energy Corporation (NYSE:VLO) is among the top gainers as its shares are trading at $23.66, up $1.38 (+6.2%) from the previous close of $22.28. Valero Energy Corporation is an independent refining and marketing company, which owns and operates refineries that produce conventional gasolines, distillates, jet fuel, asphalt, petrochemicals, and lubricants.

Stock Price Performance: From July 12, 2011, to September 7, 2011, the stock price had fallen $2.90 (-11.5%) from $25.18 to $22.28. The stock price saw one of its best stretches over the last year between September 23, 2010 and October 1, 2010 when shares rose for seven straight trading days, rising 6.1% (+$1). It saw one of its worst periods between July 29, 2011 and August 8, 2011 when shares fell for seven straight trading days, falling 27.1% (-$6.78).

The stock price is up for MARATHON PETROLEUM CORPORATION (MPC), as shares are trading at $37.89, up $1.60 (+4.4%) from the previous close of $36.29.

Stock Price Performance: From July 12, 2011, to September 7, 2011, the stock price had fallen $3.97 (-9.9%) from $40.26 to $36.29. The stock price saw one of its best stretches over the last year between June 24, 2011 and July 5, 2011 when shares rose for seven straight trading days, rising 13.3% (+$4.93). It saw one of its worst periods between August 1, 2011 and August 8, 2011 when shares fell for six straight trading days, falling 28.1% (-$12.57).

SanDisk Corporation (NASDAQ:SNDK) is among the top gainers as its shares are trading at $39.51, up $1.88 (+5%) from the previous close of $37.63. SanDisk Corp. is a multinational corporation, whose main focus is the design, development, manufacturing and marketing of flash memory card products. Its data-storage solutions include removable cards and universal serial bus (NYSE:USB) drives, which can be used in a wide gamut of consumer electronics products, such as digital cameras and mobile phones.

Stock Price Performance: From June 13, 2011, to September 7, 2011, the stock price had fallen $4.82 (-11.4%) from $42.45 to $37.63. The stock price saw one of its best stretches over the last year between April 18, 2011 and April 27, 2011 when shares rose for seven straight trading days, rising 9.2% (+$4.26). It saw one of its worst periods between August 15, 2011 and August 22, 2011 when shares fell for six straight trading days, falling 15.3% (-$5.83).

Micron Technology Inc. (NASDAQ:MU) is among the top gainers as its shares are trading at $6.44, up 38 cents (+6.3%) from the previous close of $6.06. Micron Technology is a global manufacturer and marketer of Flash memory, image sensors and other semiconductor components.

Stock Price Performance: From June 13, 2011, to September 7, 2011, the stock price had fallen $2.23 (-26.9%) from $8.29 to $6.06. The stock price saw one of its best stretches over the last year between January 28, 2011 and February 8, 2011 when shares rose for eight straight trading days, rising 10.3% (+$1.07). It saw one of its worst periods between May 31, 2011 and June 13, 2011 when shares fell for 10 straight trading days, falling 18.7% (-$1.91).

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