U.S. securities regulators are investigating a group of hackers suspected of breaking into corporate email accounts to steal information to trade on, such as confidential details about mergers, according to people familiar with the matter. The Securities and Exchange Commission has asked at least eight listed companies to provide details of their data breaches, one of the people said. The unusual move by the agency reflects increasing concerns about cyber attacks on U.S. companies and government agencies. It is an "absolute first" for the SEC to approach companies about possible breaches in connection with an insider ... (full story)