---
title: "How major US stock indexes fared Monday 5/18/2026"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286815346.md"
description: "On May 18, 2026, major US stock indexes experienced volatility amid uncertainty regarding the Iran war. The S&P 500 closed 0.1% lower, marking its second consecutive drop since reaching an all-time high. The Dow Jones Industrial Average rose by 0.3%, while the Nasdaq composite saw a decline."
datetime: "2026-05-18T20:27:18.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286815346.md)
  - [en](https://longbridge.com/en/news/286815346.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286815346.md)
---

# How major US stock indexes fared Monday 5/18/2026

Oil prices and stock markets worldwide kept swinging with uncertainty about what will happen with the Iran war. The S&P 500 swiveled between gains and losses in the morning before ending 0.1% lower Monday, its second straight drop since setting an all-time high last week. The Dow Jones Industrial Average added 0.3%, and the Nasdaq composite fell 0....

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