Recent developments in the Strait of Hormuz have led to significant market fluctuations. The S&P 500 and U.S. stocks initially reacted positively to news of a potential blockade of Iranian ports, amid hopes for a U.S.-Iran deal. Oil prices surged above $100 a barrel as traders anticipated supply risks due to the blockade plans. However, following signals of ongoing diplomatic efforts and a breakdown in ceasefire talks, oil prices experienced volatility, dropping back below the $100 mark at times. Despite the rising tensions and conflicts impacting oil supply, U.S. stocks have shown resilience, with some indices erasing previous losses. Analysts remain cautious as the situation develops, pointing to the possibility of further price increases if diplomatic efforts fail.