Oil slides and Wall Street jumps after Iran reopens the Strait of Hormuz

# Oil slides and Wall Street jumps after Iran reopens the Strait of Hormuz

Benchmark crude fell sharply and U.S. stocks hit records on April 17, 2026, after Iran said the strategic waterway was open again to commercial shipping.

Oil markets and Wall Street moved in opposite directions on April 17, 2026, after Iran said the Strait of Hormuz was open again to commercial shipping.

The evidence packet says the announcement quickly pushed U.S. crude down 9.4% to $82.59 a barrel and Brent crude down 9.1% to $90.38. That is a large one-day move for a market that had spent weeks reacting to the Middle East war and fears of supply disruption through the narrow waterway that carries a major share of global oil exports.

Investors responded just as sharply. The S&P 500 rose 1.2% to a record close, the Dow Jones Industrial Average gained 868.71 points to 49,447.43 and the Nasdaq composite climbed 365.78 points to 24,468.48. At one point, the Dow had been up 1,100 points before trimming part of the gain, showing both the scale of the relief rally and the lingering caution.

The packet says the move was triggered by a post from Iran’s foreign minister stating that passage for commercial vessels through the strait was “declared completely open.” That was enough to change the tone on trading desks because the waterway is one of the biggest pressure points in the global energy system. Any sign of reduced risk there can quickly alter expectations for fuel costs, inflation and corporate profits.

The market reaction spread well beyond oil producers and refiners. Airlines, cruise operators, homebuilders and other rate-sensitive sectors all gained as investors priced in lower fuel costs and the possibility of easier inflation. That is why oil’s drop mattered not only as a commodity story but as a macroeconomic one.

The packet also links the move to bonds. The 10-year Treasury yield slipped to 4.24% from 4.32%, suggesting investors were slightly less worried about inflation staying elevated. Lower yields can feed through to mortgages and business borrowing costs, which is why homebuilders and automakers also benefited.

The stock rally came after a period in which the U.S. market had already recovered strongly from a late-March bottom. The packet says Wall Street had climbed more than 12% on hopes that the U.S. and Iran could avoid a worse economic outcome despite the war. Friday’s move looked like another expression of that hope, though one still contingent on events staying calm.

There are limits to the optimism. The packet notes that the reopening may only be temporary and that prior episodes of hope in the conflict have quickly given way to doubt and sudden reversals in stocks, bonds and oil. That volatility remains part of the story.

Even so, the day’s trading showed how closely the global economy still tracks developments in the Strait of Hormuz. A single announcement from Tehran was enough to change market pricing across energy, transport, housing and finance in a matter of hours.