Best Quantum Computing Stocks
A ranked list of the best quantum computing stocks to know in 2026, grouped by how much of their business is actually quantum. Pure-plays give the most direct exposure; diversified mega-caps give a quantum research program wrapped in a profitable business. Market caps update daily — this is informational only, not investment advice.
Pure-play quantum computing stocks
Companies built primarily around quantum computing — the most direct, and most volatile, way to invest in the theme.
IonQ is the largest pure-play public bet on trapped-ion quantum computing. The company builds quantum processors that manipulate individual ytterbium ions with lasers, an approach prized for high gate fidelity and long coherence times. Revenue is still small and tied to government and cloud-marketplace contracts, but IonQ has become the most-traded ticker whenever quantum-computing headlines move retail flows.
D-Wave is the only public pure-play on quantum annealing, an approach optimized for combinatorial-optimization problems rather than universal gate-based computation. The company also offers a gate-model roadmap and a Leap cloud service, but its differentiator is annealing hardware that is already in commercial deployment with customers in logistics and finance.
Rigetti is a pure-play superconducting quantum computing company that designs its own multi-chip processors and operates a quantum cloud platform. The thesis rests on superconducting qubits being the same architecture used by IBM and Google, with Rigetti positioned as the smallest-cap way to own that approach. Execution risk is high, revenue is research-grade, and the share count has expanded materially.
Quantum Computing Inc focuses on photonic quantum hardware and quantum-inspired software it markets for optimization, sensing, and machine learning workloads. Revenue is minimal and the ticker trades as a high-beta retail vehicle whose moves often outrun fundamentals. Investors should weigh photonic claims against verifiable product shipments.
SEALSQ designs secure-element semiconductors and is building a post-quantum cryptography product line to protect connected devices once quantum computers can break current public-key schemes. Like Arqit, the angle is defense against quantum rather than building one, but SEALSQ ships physical chips rather than software keys.
Arqit sells symmetric-key encryption software designed to be resilient against future quantum attacks. It is not a quantum computer company; it is a post-quantum cryptography company whose product addresses the security threat that scalable quantum computing would create. Read Arqit as a security thesis adjacent to the quantum trade, not as a bet on quantum hardware itself.
Diversified quantum stocks (big tech)
Profitable mega-caps running serious quantum programs. Quantum is a small share of revenue, so you get exposure with far less risk.
NVIDIA does not build quantum computers but supplies the GPU-based simulation and hybrid-classical infrastructure used by nearly every serious quantum hardware team. CUDA-Q is its platform for hybrid quantum-classical workloads and increasingly co-located GPU+QPU systems. Treat NVDA as a picks-and-shovels exposure rather than a direct quantum bet.
Google Quantum AI develops superconducting quantum processors and is best known for the Willow chip, which demonstrated meaningful below-threshold error correction. Quantum is immaterial to Alphabet earnings, but the research output is among the most cited in the field and a quantum-error-correction milestone here often moves the entire sector.
Microsoft is pursuing topological qubits with its Majorana hardware program while offering Azure Quantum as a cloud aggregator of partner hardware. The topological bet is high-risk and high-reward: if the underlying physics holds up, the resulting qubits would be intrinsically more stable than any competing approach. Software side: the Q# language and Azure Quantum job orchestration.
Amazon runs Amazon Braket, a cloud service that brokers access to multiple third-party quantum processors, and has its own Center for Quantum Computing at Caltech working on error-suppressed cat-qubit hardware. The thesis is similar to Microsoft's: cloud aggregation today, an in-house hardware bet for tomorrow.
Intel is pursuing silicon spin qubits, an approach that would let it manufacture quantum processors using existing CMOS fabrication infrastructure. Progress has been steady but quiet compared to IBM and Google. Quantum is immaterial to Intel earnings and the stock primarily trades on its core foundry and PC-CPU narrative.
IBM runs the most mature commercial quantum program of any public company. IBM Quantum operates a fleet of superconducting processors over the cloud, publishes a detailed hardware roadmap, and ships Qiskit, the most widely used open-source quantum software stack. Quantum is a tiny share of IBM revenue, but no other diversified bet has more direct quantum exposure or a longer track record.
Honeywell spun its quantum hardware group into Quantinuum, a privately held trapped-ion company in which Honeywell holds a majority stake. Buying HON is the only public-market way to own Quantinuum equity, but quantum is a small fraction of Honeywell's diversified industrial revenue, so the exposure is highly diluted.
Keysight supplies the high-precision microwave electronics, control systems, and measurement instruments used to drive and read out qubits. It bought Quantum Benchmark to extend into qubit characterization software. As with FormFactor, the quantum exposure is real but small relative to a much larger electronic-test franchise.
FormFactor sells cryogenic probe stations and test equipment used to characterize superconducting and spin qubit chips. It is a classic picks-and-shovels exposure: every quantum hardware lab buying cryogenic test infrastructure is a potential customer, but quantum is only a fraction of a broader semiconductor-test revenue base.
Quantum computing ETF
One ticker for diversified exposure across the whole quantum theme.
QTUM tracks an index of roughly 70 companies tied to quantum computing and machine learning. Holdings are weighted equally and rebalanced semi-annually, which dilutes the pure-play quantum exposure but limits single-name risk. The cleanest one-ticker way to own the diversified version of the quantum theme.
Frequently asked questions
- What is the best quantum computing stock?
- There is no single best quantum computing stock — it depends on your risk tolerance. Pure-play companies like IonQ, Rigetti, and D-Wave offer the most direct exposure but carry the most risk, while diversified holdings like IBM, Alphabet, and Microsoft give you a quantum research program inside a profitable mega-cap. This page ranks both groups by market cap with the quantum thesis for each.
- What are pure-play quantum computing stocks?
- Pure-play quantum stocks are companies whose business is built primarily around quantum computing — for example IonQ (trapped-ion hardware), Rigetti (superconducting hardware), and D-Wave (quantum annealing). They are the most direct way to invest in the theme, but most have minimal revenue and high volatility.
- Is there a quantum computing ETF?
- Yes. The Defiance Quantum ETF (QTUM) tracks a basket of roughly 70 companies tied to quantum computing and machine learning. An ETF dilutes pure-play exposure but spreads single-stock risk across the whole theme.
- How often is this list updated?
- Prices and market caps refresh on a daily schedule from Financial Modeling Prep after the US market close. The quantum classification and thesis for each company are hand-curated and reviewed editorially.
See the full ranked table or read our methodology.