Amprius Technologies

Amprius Technologies develops, manufactures and sells silicon-anode lithium-ion battery cells for weight-sensitive electric platforms. The near-term market is aviation: uncrewed aerial systems, high-altitude pseudo-satellites, electric vertical takeoff and landing aircraft and autonomous delivery drones. The same cell technologies also address robotics, soldier power, defense electronics and light electric vehicles.

The operating advantage is specific energy, measured in watt-hours per kilogram. A higher figure lets an aircraft carry the same energy with less battery mass or carry more energy without increasing weight. That can extend endurance, increase payload, reduce the number of batteries required or create room for additional sensors and communications equipment.

Amprius sells 2 principal platforms. SiMaxx uses the company's silicon nanowire anode architecture for the highest-energy missions and custom cells. SiCore uses a silicon-based material system developed with Berzelius and is produced across a broader contract-manufacturing network in pouch, cylindrical and prismatic formats. Fremont remains the research, engineering, pilot-production and qualification center.

Amprius is not a prime weapons contractor. National-security exposure comes through direct development work with the Defense Innovation Unit and U.S. Army, plus battery sales to defense and aerospace manufacturers. The company does not separately report defense revenue, funded defense backlog or a program-by-program customer mix.

SiMaxx Silicon Nanowire Cells

SiMaxx is the premium platform for missions where battery mass is the dominant design constraint. Commercial cells reach up to 450 Wh/kg and 1,150 Wh/L. Amprius has also reported third-party validation above 500 Wh/kg and 1,300 Wh/L for a larger development-stage cell. The 500 Wh/kg configuration should be treated as a qualification and product-development milestone, not as proof of high-volume availability.

SiCore Energy, Power and Balanced Cells

SiCore is the scalable product family. Amprius' current product page advertises up to 450 Wh/kg across the family, but representative design specifications differ by mission. The listed power design is 370 Wh/kg and 910 Wh/L with discharge up to 10C continuous and 20C pulse. The energy design is 400 Wh/kg and 872 Wh/L. The balanced design is 346 Wh/kg and 787 Wh/L with discharge up to 3C continuous and 5C pulse. Cycle-life claims depend on cell design, charge and discharge rate and depth of discharge, so family maxima should not be applied to every cell.

Defense and Aviation Cell Development

Public programs include a Defense Innovation Unit contract for advanced drone batteries, qualifying National Defense Authorization Act compliant components and expanding Fremont prototype capacity. The U.S. Army xTechPrime effort uses AeroVironment as technology integrator for a large-format SiMaxx prototype targeting 500 Wh/kg. Earlier Army Manufacturing Technology work supported volume delivery of silicon-anode cells for conformal wearable battery packs with Inventus Power.

Manufacturing and Qualification Network

At 31-MAR-2026, Amprius reported access to more than 2.0 GWh of annual SiCore capacity through Berzelius, South Korean partners and other contract manufacturers. Fremont is being converted from a kilowatt-hour-scale SiMaxx line toward a 10 MWh SiCore pilot line for prototypes, fast customer turns and domestic qualification. Nanotech Energy is the first publicly announced U.S. contract manufacturing partner.

Deployed and Qualified Applications

Named customers and validation partners include AALTO HAPS, an Airbus subsidiary, AeroVironment, BAE Systems, Kraus Hamdani Aerospace, Matternet, Nokia Drone Networks, Nordic Wing, Teledyne FLIR and the U.S. Army. Matternet said Amprius cells are deployed in its Federal Aviation Administration type-certified M2 delivery aircraft and the companies are developing batteries for Matternet's next-generation platform.

Amprius traces its silicon nanowire work to Stanford University research in 2008. The company spent the next decade developing anodes, electrolytes, cell designs and manufacturing methods, then entered commercial battery production in 2018. Early demand centered on high-altitude and uncrewed aircraft where additional endurance can justify a premium cell cost.

On 14-SEP-2022, Amprius completed a business combination with Kensington Capital Acquisition Corp. IV. AMPX common stock and AMPX.W warrants began trading on the New York Stock Exchange on 15-SEP-2022. The listing financed technology development and an ambitious 774,000-square-foot factory plan in Brighton, Colorado.

SiCore launched commercially in January 2024 and changed the manufacturing strategy. Instead of relying on a company-owned gigafactory, Amprius built access to contract manufacturing in Asia and later the United States. The company recorded $19.1 million of Colorado-related impairment charges for 2025 and paid $20.0 million on 30-JAN-2026 to terminate the lease. The exit removed a long-duration factory obligation but increased dependence on outside producers.

Tom Stepien became chief executive on 01-JAN-2026 after joining as president in May 2025. Former chief executive Dr. Kang Sun remains a director and executive adviser. No material acquisition or divestiture was disclosed through 31-JUL-2026. The major structural changes have been the factory reversal, contract-manufacturing alliances, leadership transition and public-warrant exchange.

Revenue increased to $73.0 million in 2025 from $24.2 million in 2024. Q1 2026 revenue reached $28.5 million, up 152.9% from $11.3 million in the prior-year quarter. Gross margin improved to 20.1% from negative 20.9%. Trailing revenue through 31-MAR-2026 was approximately $90.3 million.

Repeat Drone Orders

A leading uncrewed-aircraft manufacturer placed a $15 million SiCore purchase order in February 2025, then a repeat order above $35 million in September 2025. Repeat orders matter more than isolated evaluation shipments because they indicate movement from prototype qualification toward production demand. Matternet adds a different aviation lane: commercial urban delivery using a certified aircraft and an operating network rather than a defense-only platform.

Mobility Expansion

A new Chinese light-electric-vehicle customer placed a $21 million purchase order in March 2026 for 30 Ah SiCore cylindrical cells for electric two-wheelers and three-wheelers. That order broadens the revenue base beyond premium aircraft but exposes Amprius to a more cost-sensitive market and additional geographic concentration.

Defense Demand

Direct government programs fund product development, compliant sourcing and domestic pilot capacity. Indirectly, Amprius supplies drone and aerospace customers competing for military production awards. The company said longstanding U.S. defense customers won about $500 million in new military orders during Q1 2026. Those awards belong to the customers, not Amprius, and should be treated as downstream demand indicators rather than Amprius backlog.

Capacity and Capital Efficiency

The contract-manufacturing model can add capacity faster and with less capital than a company-owned gigafactory. It also shifts execution risk to supplier yields, quality systems, pricing, trade rules and component compliance. The 10 MWh Fremont pilot line is strategically important because it gives Amprius a domestic route for rapid prototypes, early production and defense qualification while larger orders move through partner factories.

Base Case

Execution against at least $130 million of 2026 revenue requires continued conversion of remaining performance obligations, shipment of the $21 million mobility order and sustained drone demand. Gross margin must remain positive as product mix changes and new suppliers qualify. Management targets adjusted EBITDA of at least $4 million while still expecting a GAAP net loss for the year.

Upside Case

U.S. and allied manufacturing pathways could open more defense programs once cells, materials and assembly sources satisfy qualification and National Defense Authorization Act requirements. A successful Fremont pilot expansion would shorten prototype cycles. Additional military production wins by existing drone customers could translate into larger cell orders, but only after Amprius receives committed purchase orders.

Downside Case

Customer concentration, supplier dependence, slower qualification or weaker yields could delay shipments and compress margin. Amprius used $37.3 million of operating cash in Q1 2026, including the Colorado lease payment. If order conversion slows or gross margin reverses, the company could need additional financing before reaching sustainable profitability.

Key Triggers

The 05-AUG-2026 Q2 report is the immediate test. Watch revenue pace, gross margin, operating cash use, fulfillment of the repeat drone order, delivery timing for the mobility order, Defense Innovation Unit milestones, Fremont pilot-line progress, domestic qualification and any disclosure separating defense demand from broader commercial obligations.

The relevant procurement comparison is not every battery company. It is the set of suppliers able to deliver aviation-grade energy density, power, safety, form factor, qualification evidence and secure production at the required volume and price.

Amprius' strongest technical asset is more than 15 years of silicon-anode intellectual property, manufacturing know-how and application data. At 31-DEC-2025, the company said its technology was protected by more than 80 issued or pending patents, plus trade secrets and licensed Stanford intellectual property.

The commercial evidence is stronger than a typical pre-revenue battery developer. More than 500 customers had tested or validated SiCore and SiMaxx cells by the end of 2025, and Amprius had shipped more than 4.2 million cells since inception. Named users and partners include AALTO HAPS, an Airbus subsidiary, AeroVironment, BAE Systems, Matternet, Nokia Drone Networks, Nordic Wing, Teledyne FLIR and the U.S. Army. Repeat purchase orders show that some customers have moved beyond evaluation.

The two-platform model is useful. SiMaxx protects the high-energy edge while SiCore offers more formats, power profiles and outsourced capacity. That lets Amprius tailor cells to distinct missions rather than force one chemistry into every application.

The moat is not automatic. SiCore depends on Berzelius technology and outside factories. Large incumbents possess deeper capital, stronger procurement leverage and mature quality systems. Amprius must maintain a measurable flight-performance advantage while proving repeatable yields, acceptable cost, reliable delivery and compliant sourcing.

Manufacturing and Supplier Dependence

The asset-light model reduces capital requirements but makes Amprius dependent on partner factories for yield, quality, schedule and unit cost. Berzelius supplies proprietary silicon-anode materials under an exclusive North American arrangement, but future purchases still require mutually acceptable purchase-order terms. Dr. Kang Sun serves on Berzelius' board, creating a disclosed related-party governance risk.

Defense Sourcing Compliance

Defense demand increasingly requires components and materials outside restricted supply chains. Amprius has added Korean and U.S. partners and is qualifying compliant components under the Defense Innovation Unit program. A potential sourcing path is not the same as a qualified production line at target cost and volume.

Customer and Geographic Concentration

Three customers represented 49% of Q1 2026 revenue. One customer produced $27.1 million of 2025 revenue. Q1 revenue included $10.0 million from customers based in Ukraine. A lost platform qualification, conflict disruption or order-timing change could move quarterly results materially.

Working Capital and Financing

Cash fell to $62.4 million at 31-MAR-2026 from $90.5 million at year-end. Q1 operating cash use was $37.3 million, including the $20.0 million Colorado lease payment and higher working-capital needs. Future equity issuance could dilute shareholders if cash generation does not improve.

Order Conversion and Revenue Recognition

Undelivered amounts under bill-and-hold arrangements were $17.1 million at 31-MAR-2026. The $46.1 million remaining-performance-obligation balance is expected within one year, but delivery timing can move with customer schedules, contract scope or modifications. Announced purchase orders are not the same as cash received.

Technology, Safety and Cost Competition

Conventional graphite cells continue to improve while silicon-composite, lithium-metal and solid-state developers pursue similar gains. Amprius must improve cycle life, larger form factors, production quantity and cost without weakening safety or energy density. A field failure could damage customers' aircraft, trigger recalls and impair the company's qualification record.

Capital Structure

The 2026 public-warrant exchange simplified part of the capital structure but issued 2.7 million common shares. Stock options, restricted stock units and remaining warrants create further dilution potential. BlackRock's 7.4% beneficial-ownership filing is a concentration disclosure, not a strategic investment agreement.