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

Infleqtion is a neutral-atom quantum-computing and quantum-sensing company that became publicly listed in 2026. It develops quantum hardware and sensing systems and is part of the US quantum incentive portfolio. It is an early-stage pure-play whose products are still being commercialized.

Quantum Computing Inc. focuses on photonics and integrated-photonic chips, including work on thin-film lithium niobate, with applications in quantum computing, sensing, and communications. It operates a chip foundry for photonic devices. The company is a pure-play in photonic quantum technology and is at an early commercial stage.

SEALSQ designs semiconductors and provides public-key infrastructure for device security, with a stated focus on post-quantum cryptography and quantum-resistant chips. It targets connected-device, identity, and IoT security markets. SEALSQ is positioned as a pure-play in quantum-resistant hardware security and is at an early commercial stage.

BTQ Technologies works on post-quantum cryptography and quantum-secure infrastructure, including hardware and protocols intended to protect networks against quantum-enabled attacks. It targets security and blockchain-related use cases. BTQ is a pure-play in post-quantum security and is an early-stage company.

Arqit develops symmetric-key encryption technology designed to protect data against future quantum-enabled attacks. Its products target enterprise, telecom, and government customers seeking quantum-safe communications. Arqit is a pure-play in post-quantum security and is an early-stage, pre-scale revenue 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 Willow and Quantum Echoes work is a task-specific research milestone, not general-purpose commercial quantum advantage. Quantum is a material research program but a small share of the advertising-led and cloud-led business.

Microsoft operates a quantum program spanning the Azure Quantum cloud service and quantum development tools. Its Majorana 1 topological-qubit work is an announced research roadmap rather than settled commercialization. Azure Quantum also provides access to third-party hardware. Quantum is a small part of Microsoft's 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.

Intel is a semiconductor manufacturer with a quantum research program focused on silicon spin qubits and cryogenic control electronics, drawing on its chip-fabrication expertise. Quantum is a long-horizon research effort and a small part of Intel, whose business is centered on processors and foundry services.

IBM is a diversified technology and consulting company with one of the longest-running corporate quantum programs. IBM Quantum builds superconducting quantum processors, publishes a hardware roadmap, and offers cloud access and the Qiskit software framework. Quantum is a major research effort but a small part of total revenue.

Honeywell is a diversified industrial company and is the majority owner of Quantinuum, a trapped-ion quantum computing and software business formed from Honeywell Quantum Solutions and Cambridge Quantum. Quantinuum develops quantum hardware, post-quantum security, and quantum software. Quantum is a small part of Honeywell's overall industrial portfolio.

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.

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.

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, in 2026, launched a quantum technology solutions unit positioned to fabricate components for quantum-computing systems. Its quantum relevance 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 used to test semiconductors and advanced devices. Its cryogenic probe stations are used by quantum-hardware developers and research labs to characterize qubit chips at very low temperatures. Quantum and research test is one part of FormFactor's broader semiconductor-test 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.

Aehr makes test and burn-in systems and wafer-level test equipment for semiconductors. The company has described work extending its test platforms toward quantum-related and photonics devices. Semiconductor and photonics test is its core business, and quantum-device test is an emerging, small portion of its end markets.

Marvell designs data-infrastructure semiconductors, including high-speed interconnect, optical, and custom silicon products. High-speed control and interconnect components of this kind are part of the broader hardware stack around advanced computing systems, including quantum-classical integration. Quantum is a small, indirect end market within Marvell's data-center-led business.

Teradyne makes automated test equipment for semiconductors and electronics, along with robotics products. Advanced device-test capability of this kind is part of the broader supply chain that supports development and qualification of next-generation chips, including quantum-related devices. Quantum is a small, indirect end market within Teradyne's test and robotics business.

Tower Semiconductor is a specialty foundry that manufactures analog and mixed-signal chips, including silicon photonics and RF processes. Specialty and photonic foundry processes of this type can support photonic and control chips relevant to quantum systems. Quantum is a small, indirect part of Tower's broad foundry customer base.

Fabrinet is a contract manufacturer specializing in precision optical and photonic assemblies for communications, industrial, and scientific customers. Precision photonics manufacturing of this kind supports the optical and photonic components used across the quantum hardware supply chain. Quantum is a small, indirect part of Fabrinet's broad manufacturing base.

IPG Photonics makes high-power fiber lasers and amplifiers for industrial, medical, and scientific applications. Laser sources of this type are used in research and in atom-based quantum systems. Quantum and scientific uses are a small, indirect part of IPG's industrial-laser business.