A California federal judge has ordered Hewlett-Packard Co and Chief Executive Meg Whitman to defend a securities shareholder class action that claims they knew statements about HPs acquisition of software company Autonomy were misleading. Senior District Judge Charles Breyer issued his ruling in San Francisco federal court on Tuesday. The ruling also dismissed claims against five other former directors and executives of the information technology supplier, including one-time CEO Leo Apotheker. The securities class action against HP and its executives was brought last November by investors including lead plaintiff PGGM Vermogensbeheer B.V., a Dutch pension administrator operating in the healthcare and social work sectors.