Among the stock activity stories for Monday, June 4, from AP Business News:
— General Motors tumbled close to a 52-week low as industry analysts questioned the automaker's plan to pay several billion dollars to unload part of its huge pension liability.
— Shares of MagicJack VocalTec Ltd. rose after the company said its profit and revenue in April and May has already surpassed what analysts expected for the entire second quarter.
