Tensions Hidden Amidst Mixed Signals: Why Wall Street is Watching Oil Prices Again

On May 18 in New York, U.S. equities ended mixed as a surge in oil prices and a correction in tech shares weighed on markets. The Dow Jones Industrial Average rose about 0.3% on gains in defensive stocks, while the S&P 500 slipped 0.1% and the Nasdaq Composite fell 0.5%, reflecting weakness in growth-oriented names.

Oil once again proved the biggest market mover. With the Strait of Hormuz effectively blocked and rising fears of a U.S.-Iran confrontation, Brent crude climbed to around $110 per barrel, and the yield on the U.S. 10-year Treasury jumped sharply. President Donald Trump announced he would postpone a planned large-scale strike on Iran at the request of Gulf allies—averting the worst-case scenario—but cautioned that attacks could resume if negotiations fail, keeping risk appetite in check.

Inflationary pressure from higher energy costs, coupled with speculation that newly appointed Federal Reserve Chair Kevin Warsh may delay rate cuts, further weighed on tech valuations. April’s retail sales and industrial production broadly met expectations, confirming economic momentum, yet also signaling that the Fed might maintain higher rates for longer, adding to market headwinds.

On the corporate front, profit-taking hit semiconductor and big-tech stocks ahead of this week’s earnings reports from Nvidia and Walmart, while energy and defensive sectors outperformed. In the near term, investors will be watching how oil prices, long-term U.S. yields, and Nvidia’s results reshape Fed policy expectations and growth-stock valuations.