---
title: "Amentum Holdings Inc. Stock Falls Wednesday, Underperforms Market"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/298506213.md"
description: "Amentum Holdings Inc. (AMTM) stock fell 4.12% to $19.31 on Wednesday, underperforming the broader market as the S&P 500 and Dow Jones also declined. The stock remains significantly below its 52-week high of $38.11, with trading volume slightly below the 50-day average."
datetime: "2026-09-09T21:18:17.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/298506213.md)
  - [en](https://longbridge.com/en/news/298506213.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/298506213.md)
generator: "portal-rs"
---

# Amentum Holdings Inc. Stock Falls Wednesday, Underperforms Market

This article was automatically generated by MarketWatch using technology from Automated Insights.

Shares of Amentum Holdings Inc. (AMTM) shed 4.12% to $19.31 Wednesday, on what proved to be an all-around poor trading session for the stock market, with the S&P 500 Index falling 0.48% to 7,636.36 and Dow Jones Industrial Average falling 0.77% to 52,380.66.

Amentum Holdings Inc. closed 49.33% short of its 52-week high of $38.11, which the company achieved on February 6th.

Trading volume (2.0 M) remained 121,106 below its 50-day average volume of 2.1 M.

Data source: Dow Jones Market Data, FactSet. Data compiled September 9, 2026.

This content was created by MarketWatch, which is operated by Dow Jones & Co. MarketWatch is published independently from Dow Jones Newswires and The Wall Street Journal.

(END) Dow Jones Newswires

09-09-26 1718ET

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---
> **Disclaimer: This article is for reference only and does not constitute any investment advice.**