Quantum Computing Stocks: Pure-Play, Big Tech & Enabling Tech

Infleqtion builds neutral-atom quantum computers and also develops quantum sensing products, atomic clocks, and quantum networking systems. The company became publicly listed in 2026 and works with US government agencies and commercial customers on quantum research and manufacturing programs. Infleqtion is a pure-play quantum technology company.

Xanadu develops photonic quantum computers, which use light rather than superconducting circuits or trapped ions to carry quantum information, and provides cloud access to its machines. The Canadian company also maintains PennyLane, an open-source library for quantum programming and quantum machine learning. Xanadu is a pure-play quantum computing company.

IQM builds full-stack superconducting quantum computers and sells complete systems to universities, research centers, and high-performance computing facilities rather than only cloud access. The Finnish company offers machines ranging from small research systems to larger installations intended for error-corrected operation. IQM is a pure-play quantum computing company listed in the United States.

Quantinuum builds trapped-ion quantum computers and the software that runs on them, offering a full stack from hardware systems to development tools and application libraries. It was formed by combining the Honeywell quantum division with Cambridge Quantum and listed on Nasdaq in 2026. Quantinuum is a pure-play quantum computing company.

Nvidia supplies GPUs and software used to simulate quantum circuits and to run hybrid quantum-classical workloads, and offers the CUDA-Q platform and quantum-classical integration tools for connecting GPUs to quantum processors. Quantum-related tools are a small part of Nvidia, whose revenue is led by data-center AI accelerators.

Alphabet, the parent of Google, runs Google Quantum AI, which develops superconducting quantum processors and error-correction research. Its published results are task-specific research milestones rather than general-purpose commercial quantum advantage. Quantum is a substantial research program but a small share of a business led by advertising and cloud services.

Microsoft runs a quantum program spanning the Azure Quantum cloud service and quantum development tools, and it provides access to third-party quantum hardware. Its own qubit research follows a topological approach that remains a stated roadmap rather than settled commercialization. Quantum is a small part of Microsoft cloud-led and software-led results.

Amazon offers quantum computing through Amazon Braket, a cloud service that provides access to multiple third-party quantum processors, and conducts its own quantum-hardware and error-correction research through an AWS quantum center. Quantum is a small part of Amazon, whose revenue is led by retail and AWS cloud services.

IBM is a diversified technology and consulting company that runs one of the longest-standing corporate quantum programs. IBM Quantum builds superconducting processors, publishes a public hardware roadmap, and provides cloud access along with the Qiskit software framework. The company has committed sustained multi-billion-dollar investment to quantum, which remains a small share of total revenue.

Honeywell is a diversified industrial company and the largest shareholder in Quantinuum, the trapped-ion quantum computing and software business it formed from its own quantum division and Cambridge Quantum. Quantinuum listed publicly in 2026, and Honeywell retains close to half of its voting power. Quantum is a small part of the Honeywell industrial portfolio.

Quantum Computing Inc. makes thin-film lithium niobate photonic chips and builds an entropy quantum computer aimed at optimization problems. It runs a photonic chip foundry and semiconductor packaging operations that serve outside customers as well as its own systems. Quantum computing is one part of a business centered on photonics and chip manufacturing.

Horizon Quantum develops software tools that let developers build quantum programs from code written in conventional languages, rather than composing quantum circuits by hand. The Singapore-based company runs quantum computing testbeds and became publicly listed in 2026 through a merger with a special purpose acquisition company. Its business is entirely quantum software.

SEALSQ designs secure semiconductors and public key infrastructure for connected devices, with a focus on post-quantum cryptography and quantum-resistant chips. It sells secure elements and identity services into device, industrial, and government markets, and it partners with chip foundries and quantum hardware developers. SEALSQ works in quantum-resistant security rather than quantum computing.

Arqit develops symmetric key encryption technology designed to protect data against future quantum-enabled attacks, delivered through a cloud platform. Its products target enterprise, telecom, and government customers that want quantum-safe communications. Arqit is a pure-play in post-quantum security rather than a builder of quantum computers.

Intel is a semiconductor manufacturer with a quantum research effort centered on silicon spin qubits and cryogenic control electronics, drawing on its chip-fabrication capability. It pursues this work partly through government-backed research collaborations with other companies and national laboratories. Quantum is a long-horizon research activity within a business built on processors and foundry services.

Coherent makes lasers, photonics, optical components, and materials used across communications, industrial, and scientific markets. Its laser and photonic products are part of the broader optics supply chain that quantum hardware developers draw on for control, measurement, and networking. Quantum is one of many end markets for Coherent.

Keysight makes electronic test and measurement equipment and offers a dedicated quantum-engineering line of control, calibration, and characterization tools used by quantum-hardware developers. It also works in post-quantum security testing. Quantum is one focused application within Keysight's broad test-and-measurement business.

GlobalFoundries is a semiconductor foundry that manufactures chips for many industries and offers a quantum technology solutions line positioned to fabricate components for quantum systems. It also invests in silicon photonics processes and partners with makers of post-quantum security chips. Its role is as an enabling manufacturer rather than a quantum computer developer.

MKS Inc. supplies instruments, photonics, lasers, vacuum, and materials-handling subsystems used in semiconductor and advanced manufacturing. Its vacuum, laser, and photonics products serve fabrication and measurement environments, including ones used to build and operate quantum hardware. Quantum is a small slice of MKS's diversified equipment business.

FormFactor makes probe cards, test systems, and cryogenic measurement equipment for semiconductors and advanced devices. It sells a dedicated quantum cryogenics line spanning cryogenic probe systems, chip-scale cryostats, and dilution refrigerators used to cool and characterize qubit chips, along with cryogenic test services. Quantum test is one part of a broader semiconductor test business.

Lumentum makes optical and photonic products, including lasers and components for telecom, datacom, and industrial uses. Photonic components and light sources of this type are used in quantum communications and in optical and photonic quantum systems. Quantum is one of several end markets within Lumentum's broader photonics business.

nLIGHT designs and manufactures high-power semiconductor and fiber lasers for industrial, microfabrication, defense, and scientific uses. Precision laser sources of this kind are used in trapped-ion and neutral-atom quantum systems for cooling and controlling atoms. Quantum and scientific markets are one part of nLIGHT's broader laser business.