AMPX vs ENVX: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. AMPX and ENVX share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined AMPX and ENVX exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Amprius Technologies develops and sells silicon-anode lithium-ion batteries that target higher energy density than conventional graphite-anode cells, meaning more energy in the same weight and volume. Its SiMaxx platform uses a proprietary 100% silicon-nanowire anode made in-house at its Fremont, California facility and is positioned for the most demanding high-performance uses, while its newer SiCore platform is a commercially available silicon-anode line, including a 450 Wh/kg cell, designed for near-term mass production. Higher energy density matters most where weight is critical, which is why Amprius concentrates on aviation, electric vertical takeoff and landing (eVTOL) aircraft, drones, defense, and electric vehicles. The company ships cells to a broad and growing base of customers and holds defense agreements such as a contract with the U.S. Defense Innovation Unit for NDAA-compliant advanced drone batteries.

Full AMPX guide

Enovix Corporation designs and manufactures silicon-anode lithium-ion batteries. In a conventional battery the anode is mostly graphite; Enovix replaces most of that with silicon, which can store more lithium and therefore more energy in the same volume. Its architecture is engineered to deliver higher volumetric energy density (energy per unit of space), which matters most in devices where space is tight, such as smartphones, AR and smart eyewear, wearables, and, increasingly, drones and defense systems. The company also markets safety features and a purpose-built manufacturing approach.

Full ENVX guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• AMPX drivers: Energy-density edge; Aviation, defense, and drone demand.
• ENVX drivers: Smartphone qualification and ramp; Smart eyewear and AI hardware.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Amprius is in an early commercial ramp and is not yet consistently profitable, so it depends on its cash balance and may need to raise capital, which can dilute shareholders. For ENVX, enovix is a pre-scale, loss-making company, and the central risk is that it never reaches profitable volume manufacturing: it has a history of net losses and expects them to continue until significant production begins.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick AMPX if you believe its drivers more; ENVX if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the AMPX and ENVX guides.

AMPX. Amprius is a speculative, ramp-stage company, so it cannot be valued on current earnings; the market prices it largely on the option value of future growth and scale. Figures are approximate and change frequently, especially cash, share count, and market cap, which capital raises and dilution can move materially. Verify the latest filings before relying on any number.

ENVX. Figures are approximate and tied to the asOf date; verify live numbers before acting. Enovix is a pre-scale growth company, so traditional earnings multiples do not apply while it is loss-making. The market is valuing the option on future silicon-anode adoption, which makes cash runway, gross-margin trajectory, qualification milestones, and manufacturing yield the numbers that matter most. Because so much value rests on milestones that have slipped before, the stock is speculative and can move sharply on news of qualification progress, orders, or delays.

Headline figures (approximate, Q1 2026 (reported May 2026)): AMPX shows revenue (fy2025) ~$73.0 million (up over 3x year over year), revenue (q1 2026) ~$28.5 million (up ~153% year over year), net loss (fy2025) ~$44.0 million (incl. ~$22.5M Colorado impairment; ~$21.5M adjusted), cash and equivalents ~$91.9 million reported at end of 2025 (verify latest); ENVX shows revenue (q1 2026) ~$7.6 million, up roughly 49% year over year but still very small for a company at this valuation, gross margin Modest positive non-GAAP gross margin (around the mid-20s percent) and a sixth consecutive quarter of positive gross profit, profitability Net loss of roughly $38 million in Q1 2026; management expects continued operating and net losses until significant production begins, commercial traction First commercial smart-eyewear production order (~50,000 units), a Korea-manufactured product pipeline reported above $130 million, and smartphone qualification in progress.

AMPX and ENVX are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined AMPX and ENVX exposure against your real portfolio. It is not an investment adviser.