Among the stock activity stories for Monday, June 25, from The Associated Press:
— Shares of Chesapeake Energy Corp. dropped following a report that the company colluded with a Canadian rival to suppress land prices in areas that were considered to be rich in oil and natural gas.
— GeoEye Inc.'s shares slid after the satellite imagery provider disclosed that a federal agency would not renew a major contract with the company.
— Shares of Old Republic International Corp. tumble after the insurance underwriter said it had withdrawn plans to spin off a subsidiary.
