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Publicly Traded Quantum Companies

Exploring The Quantum Industry

Publicly Traded Quantum Companies

This page lists quantum computing and quantum technology companies that are publicly traded on major stock exchanges worldwide. These companies offer investors direct exposure to the quantum technology sector through traditional equity markets.

North American Exchanges

IonQ, Inc.

Exchange: NYSE Ticker Symbol: IONQ IPO Date: October 2021 (SPAC merger) Headquarters: College Park, Maryland, USA

Overview: IonQ is the first pure-play quantum computing company to go public, specializing in trapped-ion quantum computers. The company went public through a SPAC merger with dMY Technology Group III, raising $636 million in gross proceeds. IonQ’s quantum computers are accessible through major cloud platforms including AWS Braket, Azure Quantum, and Google Cloud.

Recent Developments:

  • September 2025: Secured UK regulatory approval for $1.065 billion acquisition of Oxford Ionics, the largest acquisition in quantum computing history
  • Provides quantum computing services to Fortune 500 companies and research institutions
  • Achieved industry-leading gate fidelities with trapped-ion technology

Focus Areas: Trapped-ion quantum processors, quantum cloud services, quantum algorithms

Website: https://ionq.com

Rigetti Computing, Inc.

Exchange: NASDAQ Ticker Symbol: RGTI IPO Date: March 2022 (SPAC merger) Headquarters: Berkeley, California, USA

Overview: Rigetti Computing is a full-stack quantum computing company that manufactures superconducting quantum processors at their Fremont foundry facility. The company went public via SPAC merger with Supernova Partners Acquisition Company II in 2021, beginning trading in March 2022.

Recent Developments:

  • 2024-2025: Landmark partnership with Quanta Computer involving over $100 million in commitments from each party over five years
  • Quanta made a direct $35 million strategic investment in Rigetti
  • September 2025: Announced $5.7 million in quantum computing system orders
  • Collaborations with QphoX and UK’s National Quantum Computing Centre (NQCC) on optical readout technology
  • Partnership with India’s C-DAC and contract with US Air Force Research Laboratory (AFRL)

Focus Areas: Superconducting quantum processors, quantum cloud access (Forest, PyQuil), hybrid quantum-classical applications

Website: https://rigetti.com

D-Wave Quantum Inc.

Exchange: NYSE Ticker Symbol: QBTS IPO Date: August 2022 (SPAC merger) Headquarters: Burnaby, British Columbia, Canada

Overview: D-Wave Systems pioneered commercial quantum computing as the world’s first company to sell quantum computers, specializing in quantum annealing systems for optimization problems. The company went public through a SPAC merger with DPCM Capital in 2022.

Recent Developments:

  • July 2025: Completed $400 million at-the-market equity offering at average price of $15.18 per share
  • Cash balance of approximately $815 million for strategic acquisitions and corporate purposes
  • Latest Advantage system features over 5,000 qubits with 15-way connectivity
  • Serves 133 total customers including Lockheed Martin, Google/NASA, BASF, Deloitte, and MasterCard
  • Over 150 customer-developed applications through Leap cloud platform

Focus Areas: Quantum annealing systems, optimization problems, hybrid quantum-classical computing, quantum cloud services

Website: https://dwavesys.com

Horizon Quantum Computing (Pending)

Exchange: NASDAQ (Expected) Ticker Symbol: HQ (Expected) Expected Listing: Q1 2026 Headquarters: Singapore

Overview: Horizon Quantum Computing creates quantum software development tools and compilers that automatically translate conventional programming languages into quantum circuits. The company announced a SPAC merger with dMY Squared Technology Group in September 2025.

Transaction Details:

  • SPAC merger valued at approximately $503 million
  • Class A ordinary shares expected to be listed on Nasdaq under ticker HQ
  • Transaction expected to close in Q1 2026
  • Merger will provide significant capital to accelerate product development and global expansion

Focus Areas: Quantum software development tools, quantum compilers, quantum circuit optimization

Website: https://horizonquantum.com

International Exchanges

Arqit Quantum Inc.

Exchange: NASDAQ Ticker Symbol: ARQQ IPO Date: September 2021 (SPAC merger) Headquarters: London, United Kingdom

Overview: Arqit is a quantum encryption technology company that developed QuantumCloud, a unique software-only approach to creating quantum-safe encryption keys without requiring quantum hardware. Founded in 2017 by David Williams, the company went public in 2021.

Technology: QuantumCloud creates encryption keys in satellite networks and distributes them globally, offering quantum-safe security that is impossible to predict, intercept, or decode. The Federated Quantum System enables secure communications across ground, satellite, and space-based networks.

Customers & Partnerships:

  • UK Space Agency
  • European Space Agency
  • Various government departments
  • Telecommunications companies and satellite operators

Focus Areas: Quantum-safe encryption, satellite-based key distribution, post-quantum cryptography

Website: https://arqit.uk

QuantumCTek Co., Ltd.

Exchange: Shanghai Stock Exchange (STAR Market) Ticker Symbol: 688027 IPO Date: July 2020 Headquarters: Hefei, Anhui Province, China

Overview: QuantumCTek is China’s first publicly traded quantum technology company, founded in 2009 as a spinout from University of Science and Technology of China by prominent scientists including Pan Jianwei (China’s ‘father of quantum’) and Guo Guangcan.

Technology & Deployments:

  • QKD (Quantum Key Distribution) systems deployed across China’s 46-node Hefei quantum network
  • Beijing-Shanghai Quantum Communication Backbone
  • Received 504-qubit ‘Xiaohong’ superconducting chip in 2024, expanding into quantum computing

Customers: Government agencies, financial institutions, and energy companies as part of China’s national quantum strategy

Focus Areas: Quantum communication, QKD systems, quantum-secure networks, quantum computing

Market Considerations

Investment Characteristics

Opportunities:

  • Direct exposure to emerging quantum technology sector
  • Early-stage positioning in potentially transformative technology
  • Diverse approaches: hardware (IonQ, Rigetti, D-Wave), software (Horizon), security (Arqit, QuantumCTek)
  • Government and enterprise customer bases
  • Cloud service revenue models

Risks:

  • Early-stage technology with uncertain commercialization timelines
  • High cash burn rates and path to profitability unclear for some companies
  • Intense competition from well-funded private companies and tech giants
  • Technological uncertainty - multiple competing qubit platforms
  • Regulatory and geopolitical considerations (especially for quantum encryption)
  • High volatility typical of emerging technology stocks

Due Diligence Factors

When evaluating quantum computing stocks, consider:

  1. Technical Metrics:

    • Qubit count and quality (coherence times, gate fidelities)
    • System architecture and scalability roadmap
    • Error correction capabilities and plans

  2. Commercial Progress:

    • Customer count and quality (Fortune 500, government contracts)
    • Revenue growth and sources (hardware sales, cloud services, consulting)
    • Cloud platform integrations and accessibility

  3. Financial Position:

    • Cash runway and burn rate
    • Recent funding rounds and equity offerings
    • Path to profitability or breakeven

  4. Strategic Positioning:

    • Partnerships with technology leaders (Microsoft, Amazon, Google)
    • Intellectual property portfolio
    • Competitive differentiation

  5. Management & Team:

    • Founder expertise and scientific credentials
    • Commercial leadership experience
    • Board composition and strategic advisors

Additional Public Market Exposure

Quantum ETFs and Funds

While dedicated quantum computing ETFs are emerging, investors can also gain exposure through:

  • Technology-focused ETFs with quantum holdings
  • Diversified tech company positions (IBM, Google, Microsoft, Intel) with quantum divisions
  • Venture capital funds specializing in quantum technology (for accredited investors)

Tech Giants with Quantum Programs

Several publicly traded technology companies operate significant quantum computing divisions, though quantum represents a small portion of their business:

  • IBM (NYSE: IBM) - Quantum processors, cloud access, quantum network
  • Google/Alphabet (NASDAQ: GOOGL) - Quantum AI division, processor development
  • Microsoft (NASDAQ: MSFT) - Azure Quantum cloud platform, topological qubit research
  • Amazon (NASDAQ: AMZN) - Amazon Braket quantum computing service
  • Intel (NASDAQ: INTC) - Silicon spin qubit research and development
  • Honeywell/Quantinuum - Quantinuum formed from Honeywell Quantum Solutions (privately held)

Private Companies to Watch

Several major quantum companies remain private but may pursue public listings in the future:

Potential Future Public Companies:

  • PsiQuantum ($7B valuation, $1B Series E in September 2025)
  • Atom Computing (Microsoft partnership, 24 logical qubits demonstrated)
  • Quantum Machines ($170M Series C, February 2025)
  • QuEra Computing (neutral atom platform, partnerships with Deloitte and BCG X)
  • IQM ($€320M Series B)
  • Alice & Bob (€100M Series B, cat qubit technology)
  • Xanadu (photonic quantum computing)
  • Oxford Quantum Circuits (UK superconducting systems)

Note: Oxford Ionics will become part of IonQ following the $1.065 billion acquisition announced in September 2025.

Regulatory Considerations

Exchange Listings

Publicly traded quantum companies are subject to:

  • SEC reporting requirements (US exchanges)
  • Sarbanes-Oxley compliance
  • Regular financial disclosures (10-K, 10-Q reports)
  • Corporate governance standards

National Security

Quantum technology, particularly quantum encryption and quantum computing, may be subject to:

  • Export controls (ITAR, EAR in the United States)
  • Foreign investment reviews (CFIUS in US, ISU in UK)
  • Technology transfer restrictions
  • Government contract classifications

International Considerations

Investors should be aware of:

  • Geopolitical tensions affecting quantum technology development
  • Different regulatory frameworks across jurisdictions
  • Currency risks for international stocks
  • Cross-border investment restrictions in certain quantum technologies

Resources

Company Investor Relations

Market Data & Analysis

  • SEC EDGAR Database: https://www.sec.gov/edgar
  • Company quarterly earnings reports and investor presentations
  • Financial news coverage and analyst reports

Industry Research

  • Quantum Economic Development Consortium (QED-C)
  • Quantum computing market research reports
  • Academic publications and preprint servers (arXiv)
  • Industry conferences and quantum technology forums

Disclaimer: This information is provided for educational purposes only and does not constitute investment advice. All material has been obtained from sources believed to be accurate as of the date of publication. However, Quantum Zeitgeist makes no warranty of the accuracy or completeness of the information. Quantum technology stocks are highly speculative investments with significant risks. Always conduct your own research and consult with a qualified financial advisor before making investment decisions. Stock prices, company valuations, and market conditions can change rapidly.

Last Updated: October 2025

For more quantum computing companies across all funding stages, visit our main directory or explore our Investment Tracker for funding rounds and valuations.