AXTI vs NVDA: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 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.

Reading it: NVDA is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

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. AXTI and NVDA 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 AXTI and NVDA 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.

AXT Inc. is a small-cap manufacturer of compound semiconductor substrates and specialty materials used in optoelectronics and high-frequency wireless applications. The company's products include indium phosphide (InP) substrates for high-speed optical communications and lasers, gallium arsenide (GaAs) substrates for wireless and optoelectronic devices, and germanium (Ge) substrates for solar cells and infrared optics. The company also produces high-purity germanium and other specialty raw materials.

Full AXTI guide

NVIDIA (NVDA) designs the graphics processing units (GPUs) and the software stack that have become the standard compute platform for modern artificial intelligence. The company operates across four reporting segments. Data Center sells GPUs to the major cloud providers (Microsoft Azure, AWS, Google Cloud, Oracle, Meta) and to AI labs (OpenAI, Anthropic, xAI) for training and running large language models; it brought in about $89 billion of the $96.2 billion total in the quarter ended July 26, 2026, roughly 92% of revenue. Gaming covers GeForce consumer GPUs, NVIDIA's original core market. Professional Visualization sells workstation GPUs for design and simulation, and Automotive ships the DRIVE platform for assisted and autonomous driving. NVIDIA also builds CUDA, the proprietary software platform that lets developers write code that runs on its GPUs and that AI frameworks like PyTorch, TensorFlow, and JAX target first. Founded in 1993 by Jensen Huang, Chris Malachowsky, and Curtis Priem, headquartered in Santa Clara, California, and led by co-founder and CEO Jensen Huang, NVIDIA is the most valuable listed company in the world at about $5.25 trillion in mid-October 2026. It designs its chips and outsources manufacturing primarily to TSMC.

Full NVDA guide

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

• AXTI drivers: Indium phosphide for AI data center optics; China export control and raw material dynamics.
• NVDA drivers: Continued AI infrastructure dominance; Beyond hyperscalers: sovereign AI and enterprise.

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: China manufacturing concentration creates geopolitical and trade-policy risk, and China export controls and US export restrictions create a complex compliance environment. For NVDA, customer concentration is high: a handful of hyperscalers and AI clouds account for a large share of revenue, so any slowdown in their AI capex hits results directly, and some newer GPU-cloud customers carry heavy debt.

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 AXTI if you believe its drivers more; NVDA 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 AXTI and NVDA guides.

AXTI. AXT's valuation has moved from option value to a growth multiple: about 28 times trailing sales and about 24 times forward earnings, with trailing P/E not meaningful on near-zero TTM profit. The case rests on consensus for revenue of about $218 million in 2026 and about $461 million in 2027 as InP demand from AI data center optics scales. Q3 2026 results on October 29 (consensus about $66 million of revenue and $0.31 EPS) are the next check on that ramp.

NVDA. The trailing P/E of about 27.5x is far lower than the roughly 50x of early 2026, because earnings more than doubled while the stock rose about 15% this year; on next fiscal year's consensus EPS of about $15.91 the multiple is under 14x. The market still prices continued hyperscaler AI capex, 60%+ operating margins, and a CUDA software moat. The risk is symmetrical: if AI spending slows, estimates and the multiple can fall together. NVIDIA guided the October 2026 quarter to about $108 billion of revenue (consensus about $109 billion) and reports on November 17, 2026.

Headline figures (approximate, October 2026): AXTI shows market cap ~$3.5 billion, revenue (ttm) ~$126 million (Q2 up ~165% YoY), revenue (q2 2026) ~$47.6 million, net income (ttm) ~$4 million (Q2 2026: ~$11 million); NVDA shows revenue (ttm) ~$303 billion (+106% YoY in the July 2026 quarter), data center revenue (q2 fy2027) ~$89 billion, ~92% of revenue, operating margin (ttm) ~66%, exceptionally high for a hardware company, net income (ttm) ~$193 billion.

AXTI and NVDA 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 AXTI and NVDA exposure against your real portfolio. It is not an investment adviser.