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    Amentum Holdings (AMTM) Is Up 11.6% After Deepening Westinghouse APX Nuclear Partnership - Has The Bull Case Changed?

    Simply Wall St·08/08/2026 10:34:41
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    • On 4 August 2026, Westinghouse Electric Company announced a series of agreements with Amentum to support its APX nuclear technology platform, including AP1000 fleet deployment, AP300 small modular reactor development and licensing, and joint work on delivering 1‑gigawatt reactors at scale.
    • This collaboration deepens Amentum’s role across the nuclear project lifecycle, aligning its engineering and regulatory expertise with Westinghouse’s APX platform to pursue repeatable, fleet‑based reactor deployment worldwide.
    • We’ll now examine how Amentum’s expanded role in AP300 small modular reactor licensing could influence its existing investment narrative and growth drivers.

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    Amentum Holdings Investment Narrative Recap

    To own Amentum, you have to believe its long cycle defense, space and nuclear contracts can convert a US$47 billion backlog into steadier earnings, despite thin margins and execution risk. The Westinghouse APX agreements directly touch the current nuclear growth catalyst, but they also highlight the key risk that regulatory and licensing timelines for SMRs and gigawatt scale reactors could be slower or more complex than investors might like in the near term.

    Among recent announcements, Amentum’s appointment as program delivery partner for Rolls Royce SMRs in the UK and Czech Republic ties most closely to the Westinghouse news. Together, these roles broaden Amentum’s exposure to SMR design, delivery and owner support, reinforcing nuclear as a central growth pillar while also concentrating risk in projects where permitting, financing and regulatory approvals can stretch out well beyond management’s current planning horizon.

    Yet beneath the nuclear upside, investors should be aware that regulatory delays and project timing could...

    Read the full narrative on Amentum Holdings (it's free!)

    Amentum Holdings' narrative projects $15.7 billion revenue and $526.8 million earnings by 2029. This requires 3.4% yearly revenue growth and about a $379 million earnings increase from $148.0 million today.

    Uncover how Amentum Holdings' forecasts yield a $32.17 fair value, a 30% upside to its current price.

    Exploring Other Perspectives

    AMTM 1-Year Stock Price Chart
    AMTM 1-Year Stock Price Chart

    Some of the lowest estimate analysts were already assuming only about 1.9 percent annual revenue growth and US$549.5 million in 2029 earnings, so if you share their concern that nuclear projects may see long approval timelines, this Westinghouse news could either challenge or reinforce that more cautious view once its impact becomes clearer.

    Explore 5 other fair value estimates on Amentum Holdings - why the stock might be worth over 2x more than the current price!

    The Verdict Is Yours

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    This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.