US stock markets traded mixed on Monday, June 22, 2026, as investors digested two multi-billion-dollar acquisitions and tracked diplomatic progress between the United States and Iran that pushed oil prices sharply lower.

Deal-making dominates the morning

Trading on Wall Street followed a long weekend, with US markets closed Friday for a holiday. The major indices were uneven at midday, with the Dow Jones Industrial Average gaining 0.3 percent to 51,719 points, supported in part by a 3.2 percent rise in Caterpillar shares. The S&P 500 slipped 0.4 percent and the Nasdaq Composite fell 1.3 percent, weighed down by sharp declines in select heavyweight technology names.