Friday's close: $6.47
Week's change: +78.2%
The Bethesda company, which sells health care products and services in China, announced the first completed sale of its da Vinci surgical system, to the Chinese University of Hong Kong.
Friday's close: $20.29
Week's change: +15.2%
The Columbia provider of optical and optoelectronic signal processing services to the U.S. government and corporate clients reported a profit of $2.2 million in its third quarter, an increase of 274 percent over the same quarter a year ago.
American Community Properties Trust
Friday's close: $19.75
Week's change: -15.6%
The St. Charles company said that it would restate financial statements and warned that an accounting problem now being considered by the Internal Revenue Service could cause it to lose its tax status as a "publicly traded partnership."
Friday's close: $26.37
Week's change: -11.3%
The announcement by the Columbia firm of a lower-cost version of its nutritional fatty acid, Martek DHA, for use in food and beverages did not stave off a slide in its share price.