Big backlog, but budget risk stays loud
- Backlog reached nearly $48 billion in fiscal Q2 2026, giving Amentum strong revenue visibility.
- The growth story now centers on nuclear, space, and critical digital infrastructure, which management says are already a $4 billion-plus annual revenue base.
- Amentum still depends heavily on government budgets, with 81% of fiscal 2025 revenue tied to U.S. federal work.
- Debt remains a key issue after the Jacobs CMS merger, though management says it is on track for less than 3.0x net leverage by fiscal year-end 2026.
- The stock gets credit for growth and valuation, but weak recent performance and only middling financial health keep Finn cautious.
Backlog is the main proof
The bull case is getting easier to see. Amentum ended fiscal Q2 2026 with nearly $48 billion of backlog and a 1.2x book-to-bill ratio for the quarter and last 12 months. Book-to-bill means new orders divided by revenue. A number above 1.0 means the work pile is growing.
Management also put a clearer number on the faster-growth parts of the company. Nuclear, space, and critical digital infrastructure are now described as a $4 billion-plus annual revenue business with margins above the company average. That matters because these markets can grow faster than old-line government support work, especially where AI data centers, energy security, and space defense are pulling in spending.
The bear case has not gone away. Amentum is still tied to U.S. federal budgets, customer in-sourcing choices, award protests, and program ramps. Management has flagged about a 1% revenue hit in fiscal 2027 from a NASA workforce in-sourcing move, and Digital Solutions margins were down year over year as new programs ramped.
So the setup is balanced. The company has a large work pipeline and real growth angles, but investors still need proof that backlog turns into higher margins, lower debt, and cleaner free cash flow.
Long contracts, slow customers
Amentum makes money by winning large, long-term service contracts. Its customers include the Department of Energy, the Department of Defense, the Intelligence Community, NASA, and allied governments. In fiscal 2025, 81% of revenue came from contracts with the U.S. federal government, either directly or as a subcontractor.
The company works under cost-plus-fee, fixed-price, and time-and-materials contracts. In plain terms, some contracts reimburse costs and add a fee, some pay a set price, and some pay based on labor hours and materials. Fixed-price work can lift margins when Amentum executes well, but it can hurt if costs run over plan.
Its moat comes from trust, scale, security clearances, and experience on sensitive missions. The Jacobs CMS merger made Amentum larger and broader. The sale of the Rapid Solutions hardware business for $360 million also sharpened the focus on a capital-light services model and helped pay down debt.
The weak spot is the customer base. Federal work is sticky, but budget delays, shutdowns, shifting priorities, and agency choices can slow awards or move work away from contractors.
Where the work sits
Digital Solutions
This segment covers intelligence analytics, cybersecurity, space system development, next-generation IT, C5ISR, threat recognition, and digital engineering. It is growing with new awards, but margins need to improve as new programs mature.
Global Engineering Solutions
This segment handles environmental cleanup, clean energy, platform engineering, sustainment, supply chain management, NASA support, DOE work, and DOD research and testing. In fiscal Q2 2026, its adjusted EBITDA margin expanded to 8.5%.
Nuclear energy services
Amentum supports nuclear projects tied to energy security, cleanup, and new reactor activity. Management said it won nearly $1 billion of nuclear energy contracts in fiscal Q1 2026, but big revenue can take years to ramp as projects move toward construction.
Space and launch support
The company supports space systems, launch infrastructure, systems integration, and space flight operations. A resolved Space Force contract protest helped move a major award into backlog.
Critical digital infrastructure
This includes smart commercial infrastructure, data centers, digital connectivity, cyber, and network defense. The key test is whether AI and data center demand turn into major contract wins with higher margins.
Outcome-based IT models
Management is exploring contracts where Amentum gets paid for delivered outcomes, such as the DISA Compute-as-a-Service model. This could change the economics if it scales, but it is still an early watch item.
Two reporting segments
Segment mix uses fiscal Q2 2026 revenue from the Form 10-Q for the quarter ended April 3, 2026. The larger caveat is customer concentration: U.S. federal work was 81% of fiscal 2025 revenue.
What could break the thesis
Federal budget shock
High impact · Medium oddsAmentum gets most of its revenue from U.S. federal work. Shutdowns, continuing resolutions, and agency budget fights can delay awards and slow spending. The late 2025 shutdown already caused a $150 million revenue reduction in fiscal Q1 2026.
NASA and agency in-sourcing
Medium impact · Medium oddsGovernment customers can choose to bring work back inside the agency. Management has guided to about a 1% fiscal 2027 revenue impact from a NASA workforce in-sourcing initiative. That is small by itself, but it shows the customer has real power.
Digital Solutions margin lag
Medium impact · Medium oddsDigital Solutions is one of the main growth engines, but its margin was down year over year as new programs ramped. Management expects those programs to improve with time. If that does not happen, the higher-growth story may not lift company profit.
Debt limits choices
High impact · Medium oddsAmentum took on meaningful debt around the Jacobs CMS merger. Management has repaid debt faster than expected and targets less than 3.0x net leverage by fiscal year-end 2026. Until that target is met, buybacks, acquisitions, and other uses of cash stay more limited.
Fixed-price contract overruns
Medium impact · Medium oddsA higher mix of fixed-price work can help margins when projects run well. The same structure can hurt if labor, supply, or schedule costs rise above plan. This is a normal risk for engineering and services contractors, but it matters more as Amentum pushes for margin expansion.
Protests and award delays
Medium impact · Medium oddsLarge government contracts can be protested by losing bidders. Amentum has resolved the Space Force contract protest, but the NASA Cosmos JV award protest remains an open question in the internal thesis. Even when the company wins, protests can delay revenue and staffing.
In one breath
What does Amentum do?
Amentum provides engineering, digital, space, nuclear, cyber, and mission support services. Most of its work is for U.S. federal agencies and allied governments.
Why is Amentum's backlog important?
Backlog is contracted work that has not yet become revenue. Amentum had nearly $48 billion of backlog in fiscal Q2 2026, which gives the company a long runway if programs stay funded and on schedule.
Is Amentum mostly a defense company?
Defense is important, but the company is broader than defense alone. It also serves DOE, NASA, the Intelligence Community, nuclear programs, environmental cleanup, space, and digital infrastructure.
What should investors watch next?
The main items are the less than 3.0x net leverage target, Digital Solutions margin improvement, new critical digital infrastructure awards, and progress on large nuclear projects moving toward construction.