Amprius Technologies (AMPX) Q4 2025: Gross Margin Jumps 45 Points as NDAA Compliance Drives Defense Demand
Amprius Technologies delivered a transformative quarter, with gross margin expanding sharply and NDAA-compliant supply chain execution accelerating U.S. defense traction. The business now operates at a $100M+ revenue run rate, while management signals readiness for higher-volume defense and industrial deployments. Investors should focus on the company’s ability to scale contract manufacturing and secure multi-year agreements with new suppliers as volume ramps in 2026 and beyond.
Summary
- Margin Expansion: Gross margin surged as high-volume silicon anode sales displaced legacy lines and cost structure improved.
- Defense Compliance Leverage: Full NDAA-compliant supply chain positions Amprius as a go-to battery supplier for U.S. defense and allied customers.
- Scalability Watch: 2026 hinges on operationalizing new supplier agreements and ramping U.S. and Korean contract manufacturing for sustained growth.
Performance Analysis
Amprius posted record quarterly revenue, achieving an 18% sequential increase and more than doubling year-over-year, driven by rapid adoption of its second-generation Sycor silicon anode batteries. This step-change in top-line was matched by a dramatic improvement in gross margin, which rose to 24% in Q4, up 9 points quarter-over-quarter and 45 points year-over-year, as product mix shifted decisively from legacy Symax to higher-margin Sycor platforms. Full-year revenue tripled versus 2024, and annual gross margin swung from deeply negative to positive double digits, reflecting both scale and cost discipline.
Operating leverage is beginning to materialize, with operating loss (excluding a one-time Colorado facility exit charge) down 37% sequentially and adjusted EBITDA turning positive in Q4. The company’s resource-light model—outsourcing manufacturing while focusing on cell design and IP—enabled it to cross a $1M revenue-per-employee threshold and maintain a robust cash balance after completing its at-the-market offering and exiting Colorado lease obligations.
- Product Mix Shift: Sycor now dominates sales as Symax is phased out, supporting margin recovery and higher ASPs (average selling prices).
- Volume-Driven Cost Structure: Higher volumes and favorable mix reduced COGS growth below revenue growth, a key inflection for future profitability.
- Capital Efficiency: CapEx remains modest, with DIU (Defense Innovation Unit) funding offsetting most pilot line expansion costs.
Amprius is now positioned to deliver profitable growth in 2026, with the business model showing clear leverage as volumes scale and NDAA-driven demand accelerates.
Executive Commentary
"2025 was a landmark year for Amprius. Our second generation Sycor silicon anode batteries gained broad adoption with many unmanned aerial vehicle customers... We are prepared to supply domestic cells to customers such as L3Harris Technologies, which delivers integrated solutions across space, air, land, sea, and cyber in support of national security."
Tom Stepien, CEO
"I'm particularly excited about crossing the $100 million annual revenue run rate mark which positions us to deliver over a million dollars of revenue per employee, joining a very selective and unique group of companies... Our lower Cymax line mix was now below 60% of revenues, providing a powerful driver of our gross margin improvements."
Ricardo Rodriguez, CFO
Strategic Positioning
1. NDAA-Driven Supply Chain as a Moat
Amprius is ahead of schedule on NDAA (National Defense Authorization Act) compliance, with all 11 critical cell components now sourced from approved countries and multiple contract manufacturing partners in South Korea and the U.S. This regulatory alignment is already unlocking new defense contracts and positions Amprius as a preferred supplier for government and allied defense programs as 2028 sourcing deadlines approach.
2. Multi-Segment Platform with Expanding TAM
The company’s silicon anode platform is tuned for diverse end-markets, including UAVs (unmanned aerial vehicles), satellites, light electric vehicles, robotics, and EVTOL (electric vertical takeoff and landing) aircraft. This flexibility—enabled by 22 cell designs optimized for different duty cycles—broadens addressable market and supports both initial and replacement sales, a “razor blade” dynamic in segments like UAV and EVTOL.
3. Operational Flexibility and Asset-Light Scaling
Amprius leverages an asset-light model, using its Fremont pilot line for early design wins and transferring volume production to contract manufacturers as demand scales. The addition of a U.S.-based partner (Nanotech Energy) and ongoing expansion in Korea provide geographic redundancy and customer-specific compliance options. This approach enables rapid response to shifting regulatory and customer requirements.
4. Customer Base Expansion and Embeddedness
Customer count grew by over 100 in the quarter, surpassing 550 total, with average purchase order size rising and repeat business strengthening. While most new customers are still in early design or pilot phases, the growing installed base plants seeds for future high-volume production and deepens Amprius’ ecosystem ties.
5. R&D Focused on Energy Density and Cycle Life
Ongoing R&D aims to push energy density beyond 520 Wh/kg, with current bottlenecks shifting from anode to cathode development. The company’s robust testing and qualification infrastructure is designed to sustain its technical lead and support further margin expansion as new chemistries and suppliers come online.
Key Considerations
This quarter marked a strategic inflection for Amprius, as operational discipline, regulatory foresight, and product-market fit converged to drive both growth and profitability. The next phase will test the company’s ability to scale manufacturing partnerships and lock in multi-year supply agreements across a diversified supplier base.
Key Considerations:
- Defense-Driven Demand Surge: NDAA compliance is accelerating U.S. government and defense contractor pull, with DIU contracts and urgent customer requests for compliant batteries.
- Replacement Market Upside: Razor-blade economics in UAV and EVTOL segments could eventually eclipse initial sales, with high-cycle applications driving recurring revenue.
- Supplier Operationalization: Technical qualification is largely complete, but operationalizing supply chain agreements and scaling logistics remain critical execution risks.
- Geographic Mix Stability: 2026 guidance assumes international strength continues, with U.S. upside not fully baked in—potential for positive surprise if domestic drone programs ramp quickly.
Risks
Amprius faces execution risk in operationalizing its newly qualified suppliers, especially as it transitions from technical validation to high-volume, multi-year agreements. Geopolitical volatility, particularly in sourcing countries, and evolving U.S. defense procurement priorities could disrupt demand or supply chain stability. Competitive intensity remains high, with other battery manufacturers racing to meet NDAA standards, and any slip in technical or compliance leadership could erode recent gains.
Forward Outlook
For Q1 2026, Amprius expects:
- Continued revenue growth at or above the $100M annualized run rate
- Gross margin stability as Sycor mix rises and Symax phases out
For full-year 2026, management guided to:
- At least $125M in revenue, with upside possible if U.S. demand accelerates
- First full year of positive adjusted EBITDA (at least $4M), and net loss narrowing to $8M
Management highlighted several factors that will shape the year:
- DIU funding will cover most Fremont expansion and CapEx, keeping cash burn focused on working capital
- Domestic drone program decisions could drive upside not yet in baseline guidance
Takeaways
Amprius’ Q4 2025 results mark a turning point, with margin expansion validating the shift to next-gen silicon anode products and NDAA compliance cementing its defense market positioning. The company’s asset-light, flexible model provides operational leverage, but 2026 will test its ability to scale new supplier relationships and convert pilot wins to volume production.
- Margin Inflection: Product mix and operational discipline drove a dramatic margin turnaround, with further upside as volumes scale and legacy lines sunset.
- Defense and Regulatory Moat: Early NDAA compliance and DIU-backed expansion give Amprius a defensible edge in the U.S. and allied defense markets, though competition remains intense.
- Scalability and Execution: Investors should watch for evidence of successful supplier operationalization, capacity ramp, and conversion of early customer wins to recurring, high-volume sales.
Conclusion
Amprius Technologies exits 2025 with a sharpened business model, strong balance sheet, and validated technical edge, but now faces the challenge of scaling its supply chain and manufacturing partnerships to meet rising defense and industrial demand. Operational execution and supplier reliability will be the key differentiators in 2026.
Industry Read-Through
Amprius’ rapid margin recovery and NDAA-driven demand surge signal a structural shift in the advanced battery market, as regulatory compliance and supply chain transparency become central to defense and critical infrastructure procurement. Competitors lagging in compliant sourcing risk being locked out of major U.S. and allied programs, while suppliers capable of flexible, multi-country manufacturing stand to capture share. The replacement market dynamic highlighted by Amprius could reshape revenue models across UAV, robotics, and EVTOL sectors, favoring those with high-cycle, high-value applications and robust aftersales support.