Among the stock activity stories for Friday, Oct. 5, from AP Business News:

— Shares of business software maker Informatica Corp. made a small rebound after losing more than 20 percent of their value a day earlier following the company's disappointing third-quarter forecast.

— Shares of Sunesis Pharmaceuticals Inc. rose after the company discussed plans for an upcoming trial of its cancer drug vosaroxin.

— Shares of data services company Neutral Tandem Inc. fell to a new low as R.W. Baird analysts downgraded the company's rating, saying its financial performance has weakened more than expected.