US stock markets experienced a downward trend as major tech companies, particularly Alphabet and SpaceX, faced significant sell-offs, leading the Nasdaq to drop sharply. The S&P 500 and Nasdaq indices closed lower, overshadowing gains in the Dow Jones Industrial Average, which managed to hold above the 52,000 mark. Meanwhile, easing oil prices and ongoing geopolitical tensions concerning Iran contributed to a mixed trading atmosphere. Despite the struggles of big tech, there were signs of improvement in defensive blue-chip stocks, indicating investor caution amidst volatility.