Shares of Martek Biosciences ( MATK) jumped 11% in late trading Tuesday after the company reported better-than-expected fiscal first-quarter results. The company, which makes products based on the omega-3 fatty acid DHA, posted earnings of $5.6 million, or 17 cents a share, for the quarter ended Jan. 31. Excluding stock-based compensation costs, earnings were 19 cents a share, beating Thomson First Call's average analyst estimate by 6 cents. A year earlier, Martek earned $7.1 million, or 23 cents a share. Revenue, meanwhile, fell to $62.9 million from $66.5 million but topped Wall Street's forecast of $61 million. Martek shares gained $3.47 to $34 in after-hours trading. Shares of Focus Media ( FMCN) sank in late trading after the company posted its fourth-quarter results and announced an acquisition. The Chinese media company reported a fourth-quarter profit of $9.4 million, reversing a year-earlier loss of $1.8 million. Excluding stock-based compensation and amortization, Focus Media earned $9.6 million, or 23 cents per American depositary receipt, compared with a loss of $1.3 million, or 9 cents an ADR, a year earlier. Revenue jumped to $24.6 million from $11.8 million. One analyst had forecast earnings of 23 cents a share and revenue of $23 million. Looking ahead, the company projected first-quarter revenue of $28 million to $30 million. The lone analyst estimate calls for revenue of $31 million. Separately, Focus said it plans to buy Dotad Media Holdings, a provider of mobile-phone advertising services, for $15 million in cash and up to $15 million in stock. Focus said Beijing-based Dotad operates the largest wireless-access protocol-based advertisement delivery system in China. Shares shed $3.78, or 7%, to $50.80 in after-hours trading Tuesday. Distributed Energy ( DESC) fell after cautioning that it will see a decline in revenue in the first half of the year. For the fourth quarter, the company reported a loss of $3.4 million, or 9 cents a share, narrowed from a year-earlier loss of $4 million, or 11 cents a share. Revenue fell to $11 million from $11.4 million. Analysts projected a loss of 10 cents a share and revenue of $11 million.