U.S. stocks closed broadly higher on Monday as investors assessed newly expanded economic sanctions against Iran. The measures were viewed as milder than expected because they lacked a specific implementation timeline and did not identify other countries maintaining trade ties with Iran. The resumption of shuttle diplomacy between the United States and Iran also reduced perceived geopolitical risk. The Dow Jones Industrial Average rose 160.24 points, or 0.30%, to 53,577.40; the S&P 500 gained 24.42 points, or 0.32%, to 7,677.28; and the Nasdaq Composite climbed 171.11 points, or 0.66%, to 26,151.30. The Philadelphia Semiconductor Index led the market, surging 164.87 points, or 1.44%, to 11,588.04, as capital rotated toward technology and semiconductor stocks. Investors will watch U.S.-Iran relations, Federal Reserve monetary policy and upcoming economic data for the next direction of U.S. equities.