Shareholders will still have to prove that the actions at issue in the case materially affected the price of the stock, but judges will no longer have to determine whether claimants have proven that fact before letting investors band together in a class action lawsuit.

The Court issued the decision in the context of upholding a 9th U.S. Circuit Court of Appeals decision that allowed a shareholder class action suit against the biotechnology company Amgen to proceed.

Read the full Bloomberg article here.

U.S. Supreme Court building