---
title: "Amentum Holdings Inc. Stock Falls Friday, Underperforms Market"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/299490216.md"
description: "Amentum Holdings Inc. (AMTM) shares fell 2.92% to $19.60 on Friday, underperforming the broader market which saw mixed results with the S&P 500 rising slightly and the Dow Jones falling. The stock remains significantly below its 52-week high of $38.11. Trading volume reached 4.4 million, surpassing the 50-day average of 2.0 million."
datetime: "2026-09-18T21:17:17.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/299490216.md)
  - [en](https://longbridge.com/en/news/299490216.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/299490216.md)
generator: "portal-rs"
---

# Amentum Holdings Inc. Stock Falls Friday, Underperforms Market

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

Shares of Amentum Holdings Inc. (AMTM) slipped 2.92% to $19.60 Friday, on what proved to be an all-around mixed trading session for the stock market, with the S&P 500 Index rising 0.17% to 7,650.50 and the Dow Jones Industrial Average falling 0.18% to 51,682.64.

Amentum Holdings Inc. closed 48.57% short of its 52-week high of $38.11, which the company reached on February 6th.

Trading volume (4.4 M) eclipsed its 50-day average volume of 2.0 M.

Data source: Dow Jones Market Data, FactSet. Data compiled September 18, 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

09-18-26 1717ET

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