But the ruling Tuesday said some opinions in registration documents might omit important facts that could mislead investors, giving them a right to sue for securities fraud. The narrow ruling offered a limited victory to nursing home pharmacy Omnicare Inc., which was sued by investors who bought stock when it went public. A federal appeals court ruled that Omnicare offered "objectively false" opinions by saying it "believed" contracts with other companies were legal. The high court said that wasn't the right standard.