Amentum Holdings, Inc. (AMTM:NYSE) closed at $21.76 on October 23, 2026, up 2.21% on the day. The stock trades 42.9% below its 52-week high of $38.11 and 22.8% above its 52-week low of $17.72. Over the past year, it lost 3.5%. Amentum Holdings, Inc. is part of the Technology sector.
In 252 trading sessions since October 23, 2025, AMTM closed higher on 121 days (48%). Its best day was November 25, 2025 (+18.25%) and its worst was February 10, 2026 (-12.38%). The stock moved 10% or more in a single session 3 times. It opened at least 5% above the previous day's high 1 time.
Amentum is a leader in global engineering, project management and solutions integration, trusted to modernize the most critical missions anywhere in the world. Driven to create a safer, smarter, cleaner world, we innovate as a team of inventive doers passionate about making a difference. Underpinned by a strong culture of ethics, safety and inclusivity, Amentum is fiercely committed to operational excellence and successful execution. Headquartered in Chantilly, Virginia, we have more than 35,000 employees in 79 countries in all 7 continents.
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Based on end-of-day data. For information only, not investment advice.