The S&P 500 and Nasdaq closed lower as investors were anxious about the escalating Iran-Israel conflict. While the S&P 500 faced a weekly drop, the Nasdaq had a slight gain. The uncertainty in the market was influenced by the U.S. considering potential involvement in the conflict, with President Trump expected to make a decision soon. Tech stocks struggled, particularly Nvidia, while Kroger's shares surged after a positive sales forecast. The stock market experienced higher trading volumes due to a quarterly "triple-witching" event, reflecting investors' cautious sentiment.