[The Three Major U.S. Stock Indexes Closed Slightly Lower] According to Golden Finance, on September 30, the three major U.S. stock indexes closed slightly lower. The Dow Jones fell 0.25%, the S&P 500 fell 0.16%, and the Nasdaq fell 0.09%. AI hardware stocks generally rose, with Lumentum up more than 5%, Corning and Marvell Technology up more than 4%, ARM, Meta, Coherent, and Ciena up more than 3%, and SK Hynix up more than 2%.