Among the stock activity stories for Tuesday, Oct. 9, from AP Business News:
— Shares of Research In Motion Ltd., the maker of the BlackBerry phones, fell after an analyst said the company's new operating system will launch later than he had expected.
— Shares of RadioShack Corp. jumped after a Wall Street analyst boosted her rating for the electronics retailer's stock to "Buy," saying that most of the risks surrounding the shares have already been factored into their price.
