Stocks in the news: Costco, AOL, Citigroup, Ciena

Of stocks in focus, Costco (COST) posted a slight increase in fiscal-first quarter earnings to $266 million, or 60 cents per share. After beings helped by steady sales of food and everyday items to recession-weary consumers, Costco says it has recently seen purchases of some nonfood items rise slightly. Sales rose 6% to $17.3 billion and same-store sales rose 3%. Last quarter, sales fell 5%. Earnings met analyst estimates. Costco shares were 1% higher in pre-market trading.

AOL Inc. (AOL) -- the parent of DailyFinance -- will begin trading Thursday. It was spun off from Time Warner (TWX) Wednesday.