Among the stock activity stories for Monday, Sept. 24, from AP Business News:
— Shares of Pandora Media Inc. rose after a group of federal lawmakers introduced a bill that could lower the royalties the online radio service pays to artists and their record labels.
— Shares of genomic testing company Sequenom Inc. slumped after an analyst downgraded the company, saying it plans to ramp up spending as competition increases, delaying profitability.
