Wall Street opened with some spring in its step on June 15, 2026, as hopes for a diplomatic resolution between the US and Iran pushed the S&P 500 to a record-high open and the Dow Jones Industrial Average to its highest close ever.
The Dow finished the session up 468.77 points, or 0.92%, closing at a record 51,671.03. The S&P 500 climbed 1.65% to 7,554.29.
What moved markets
The catalyst was a preliminary agreement between Washington and Tehran, one that market participants interpreted as a meaningful step toward de-escalating one of the more persistent geopolitical flashpoints of the past several years.
Here’s the thing about the Strait of Hormuz: roughly one-fifth of the world’s traded oil passes through it. Any credible sign that tensions in the region are easing tends to do two things simultaneously. Oil prices fall. Equities rise. Both happened.
