Rodriguez de Quijas v. Shearson/American Express Inc., 490 U.S. 477 (1989), is a United States Supreme Court decision concerning the arbitration of securities fraud claims. It was originally brought by a group of Texas investors against their brokerage house. By a 5–4 margin the Court affirmed the Fifth Circuit Court of Appeals and ruled that their claims under the Securities Act of 1933, which regulates trading in the primary market, must be arbitrated as stipulated in their customer agreements.