US stocks surge on Iran diplomacy hopes and oil market stabilization. The S&P 500 gained 0.78% to close at 6,869.46 points, while the Nasdaq Composite jumped 1.29% to 22,807.48, driven by strong tech sector performance. Reports of Iran's openness to diplomatic talks and President Trump's pledge to stabilize oil markets eased investor concerns about Middle East tensions. Tech stocks, which sold off heavily in February, led the rebound as investors gained confidence. The Dow Jones Industrial Average rose 0.49% to 48,738.98. Analysts note the market relief stems from reduced fears of major oil market disruptions that could fuel inflation. However, experts warn optimism should be tempered, as ongoing geopolitical risks could trigger renewed volatility if the conflict persists or impacts the U.S. economy significantly.