Among the stock activity stories for Wednesday, Aug. 12, from AP Financial News: COLUMBUS, Ohio (AP) ¿ Shares of Brigham Exploration jumped for a second consecutive day after an analyst affirmed his "Strong Buy" rating for the oil and gas company and said shares still could move higher on the strength of the company's recent discoveries in North Dakota. NEW YORK (AP) ¿ Symmetricom Inc. shares tumbled, hurt by fiscal fourth-quarter results and a forecast that fell below Wall Street expectations. NEW YORK (AP) ¿ Shares of Healthcare Realty Trust Inc. rose after an analyst upgraded the stock due to strong second-quarter results and the company's refinancing plan. HARTFORD, Conn. (AP) ¿ Shares of Bucyrus International Inc. jumped as an analyst said the mining equipment maker will likely benefit from improving orders this year in coal and oil production. COLUMBUS, Ohio (AP) ¿ Shares of FMC Corp. rose after Standard & Poor's said it will add the chemical maker to its S&P 500 stock index. NEW YORK (AP) ¿ Columbia Sportswear Co.'s conservative full-year outlook and underperforming stock prompted a Goldman Sachs analyst to boost her rating and price target on the outdoor clothing company.