Amprius (AMPX) Q4 2025 earnings review
Record Top-Line and a Brutal Breakup with Capital-Heavy Manufacturing
Amprius delivered a breakout quarter, pushing revenue up 137% YoY while crossing into positive adjusted EBITDA ($1.8M) for the first time. The financial story is defined by a massive operational pivot: gross margins are rapidly Reversing from deep negative territory to a healthy 24%, validating the transition to SiCore products. However, the bottom line took a severe hit. GAAP Net Loss more than doubled to $24.4M due to a $22.5M impairment charge as management officially killed the Colorado facility project. By paying $20M to break the lease, Amprius has fully committed to a capital-light contract manufacturing model. FY26 guidance points to strong continued growth, but the immediate cash drain from the lease termination and rising working capital will test the balance sheet.
🐂 Bull Case
The 24% gross margin and first positive Adjusted EBITDA quarter prove the SiCore product line can be manufactured profitably at scale using existing partner networks.
Achieving 11-of-11 NDAA-compliant component sourcing and expanding the DIU contract to $14.8M positions the company perfectly for U.S. defense drone procurement mandates taking effect in 2028.
🐻 Bear Case
The $22.5M asset impairment and $20M cash payment to exit the Colorado lease represents a massive destruction of past capital, heavily diluting the 'clean balance sheet' narrative.
Despite positive EBITDA, operating cash flow was -$13.5M in Q4. Fast growth requires heavy working capital, which will rapidly consume the remaining cash buffer.
⚖️ Verdict: 🟢
Bullish. The write-offs are ugly but necessary. Management took the pain now to eliminate a $110M liability. The underlying business is Accelerating, margins are highly accretive, and the regulatory tailwinds in defense drones are massive.
Key Themes
Capital-Light Model Reaches Critical Mass
The company's strategic shift to contract manufacturing is yielding massive financial leverage. By retiring Gen-I SiMax products and moving entirely to the Gen-II SiCore platform—which utilizes standard lithium-ion equipment—Amprius utilized its Asian and U.S. partners to dramatically cut costs. This transition is directly responsible for Gross Margins Reversing from -76% in FY24 to +11% in FY25, peaking at 24% in Q4.
NDAA Compliance as a Strategic Moat
Macro tailwinds from the updated National Defense Authorization Act (NDAA) require DoD drones to avoid 'foreign entities of concern' by January 2028. Amprius is Accelerating its readiness, reporting an '11 out of 11' scorecard for compliant internal components. Supported by a $14.8M Defense Innovation Unit (DIU) contract, the company is standing up stateside capacity with Nanotech Energy, making it a turnkey supplier for defense primes like L3Harris.
Technology Winning Mission-Critical Applications
Silicon anode performance (up to 520 Wh/kg) is proving vital for advanced aerospace. The company secured Nokia Drone Networks as a customer because the battery provides both the burst power for takeoff and sustained energy for safety-critical edge computing. This 'espresso advantage' (delivering double the energy in the same weight profile) commands a premium that protects the company's expanding gross margins.
Cash Dynamics Contradict Positive EBITDA
Management touted a 'clean balance sheet' with $91.9M in cash, but the reality is tighter. In Q4, operating cash flow was -$13.5M (driven by $3.9M tied up in new AR and Inventory). Furthermore, the company must pay $20M in January 2026 to break its Colorado lease. This means effective starting cash for 2026 is closer to $70M. If the company continues to burn cash for working capital at the current rate, they may need to tap credit facilities despite terminating the ATM equity program.
Concentration and Geopolitical Transition Risks
While Amprius is diversifying, the bulk of current manufacturing capacity still relies on the Amprius Korea Battery Alliance and legacy Asian partners. Transitioning production recipes across 22 cell models to NDAA-compliant facilities without disrupting yield or quality is operationally intense. Any hiccup in the technology transfer to Nanotech Energy could jeopardize defense deliverables.
Other KPIs
Stable. Excluding the massive $22.5M Colorado facility charge, standard operating expenses barely ticked up to $8.9M in Q4. This proves management's claim that they can scale top-line revenue without bloat. The $900K QoQ increase was targeted specifically at sales and go-to-market efforts.
Share count grew by 4.1 million in Q4, driven by 1.8 million shares issued under the ATM program (which is now terminated) and 2.3 million from options/RSUs. Investors should appreciate that future growth is expected to be funded without further ATM dilution.
Guidance
Decelerating in percentage terms, but massive nominal growth. Implies a minimum of 71% YoY growth, compared to the 202% YoY growth achieved in FY25. Management clarified this is a baseline, relying on current customers and clear visibility, explicitly excluding potential upside from sudden U.S. defense demand spikes.
Accelerating profitability. The midpoint signals the company's first full year of positive adjusted earnings, validating the unit economics of the SiCore product line and the low fixed-cost base.
Stable and completely covered by the $14.8M Defense Innovation Unit contract. This minimal CapEx perfectly illustrates the benefits of officially abandoning the Colorado gigafactory in favor of existing manufacturing partners.
Key Questions
Working Capital Needs vs. Revenue Growth
With revenue projected to jump from $73M to $125M+, how much cash will be absorbed by Accounts Receivable and Inventory in 2026, and will existing cash be sufficient without the ATM program?
Nanotech Energy Volume Ramp
What is the specific timeline for the U.S.-based Nanotech Energy facility to transition from pilot samples to high-volume commercial shipments?
Gross Margin Ceiling
Gross margins reached 24% in Q4. Is this the sustainable run-rate for the current product mix, or do you expect further leverage as contract manufacturers reach higher capacity utilization?