U.S. stocks closed lower on Tuesday, following mixed earnings data from Morgan Stanley and Goldman Sachs, which put pressure on the banks, along with sell-offs in Boeing and Apple affecting the S&P 500 index. Morgan Stanley dropped to its lowest level in over a month after reporting lower quarterly earnings, while Goldman Sachs saw little change in its stock during most of the session after reporting a 51% jump in profits. According to preliminary data, the S&P 500 index closed down 0.37% at 4,765.96 points. The Nasdaq composite fell 0.19% to 14,944.35 points, while the Dow Jones Industrial Average dropped 0.62% to 37,360.99 points.