US stocks: S&P 500 ends nearly flat as US-Iran talks help stocks pare losses

S&P 500 ended almost flat as Microsoft declined, while Meta Platforms recorded gains amid ongoing market fluctuations. Oil prices surged following geopolitical tensions and a missile attack on Saudi Arabia, raising supply concerns. Treasury yields also increased, with the 30-year bond yield reaching its highest level since 2004. Traders anticipate a significant chance of another Federal Reserve interest rate hike based on recent business activity data.