The Russell 2000 Index fell for the third time this week, losing 0.3 percent to 670.58 at 11:08 a.m. in New York. The Standard & Poor's 500 Index (SPX), whose companies have a median market value 23 times larger than the Russell 2000's, dropped 0.6 percent. The stock indexes have declined 12 percent and 14 percent, respectively, this year.
Acme Packet Inc. (APKT US) had the biggest drop since shares began trading in October 2006, tumbling 31 percent to $5.39. The maker of devices to transmit phone calls and video predicted second-quarter earnings excluding some items as low as 2 cents a share, compared with the 9-cent average analyst estimate.
Chindex International Inc. (CHDX) rose the most since November 2006, adding 16 percent to $16.30. The provider of health-care services and products in China said it received approval from the country's government for new products.
TranS1 Inc. (TSON) fell the most since its October initial public offering, declining 33 percent to $9.50. The maker of medical devices to treat spinal diseases said second-quarter revenue may be as low as $5.9 million, less than its previous estimate of $6.3 to $6.5 million.
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