The Quantum Computing IPO Wave of 2026: Five Companies Going Public and What Each One Actually Does

[Frost Jay]

Something significant happened in quantum computing capital markets in 2026 that has not had enough attention outside the sector. Five quantum companies are going public or have just done so, bringing the total number of investable pure-play quantum stocks on US exchanges from three to eight. The mechanisms are mostly SPACs rather than traditional IPOs, which is faster but more volatile. The valuations range from $120 million to $15.7 billion. The technologies span every major qubit modality: superconducting, neutral atom, photonic and silicon spin. Here is the verified breakdown of each.

Quantinuum was the biggest. The Honeywell-backed company priced its Nasdaq IPO at $60 per share on June 4, raising $1.68 billion in gross proceeds with 28 million shares sold. Shares opened at $68 on debut day and closed little changed, giving a market value of approximately $15.7 billion. Honeywell retains around 48 percent of combined voting power. The company was formed in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum, trades under ticker QNT, and reported $30.9 million in 2025 revenue with a net loss of $192.6 million. Its flagship product is the Helios trapped-ion processor, validated at 98 qubits by Sandia National Laboratories in a collaboration with Quantinuum. Customers include JPMorgan Chase, Airbus, BMW Group, Mitsui and Amgen. (Sources: CNBC June 4 2026 reporting the $1.68 billion raise and $60 pricing; The Quantum Insider May 26 covering the S-1 and $12.7 billion fully diluted valuation at the top of the range; CNBC June 4 on the flat Nasdaq debut at $15.7 billion market value.)

Infleqtion went first. The Boulder, Colorado neutral-atom company completed its merger with Churchill Capital Corp X on February 17, listing on the NYSE under ticker INFQ with over $550 million in gross proceeds. It is the first neutral-atom quantum hardware and sensing company to reach public markets. Beyond quantum computing, Infleqtion makes quantum optical clocks, RF receivers and inertial sensors serving space, energy, finance and telecommunications. Motley Fool reported the stock surged 41 percent in a single week in May, reflecting the volatile nature of early-stage quantum stocks. (Sources: Quantum Computing Report February 18 covering the NYSE debut and $550 million gross proceeds; Motley Fool May 22 on the 41 percent weekly surge; entangledfuture.com IPO Guide March 2026 confirming INFQ ticker and Churchill Capital X merger.)

Xanadu listed in March. The Toronto-based photonic quantum computing company completed its merger with Crane Harbor Acquisition Corp on March 26, with shares beginning to trade on both Nasdaq and the Toronto Stock Exchange under ticker XNDU on March 27. Gross proceeds were approximately $302 million, with an additional up to CAD $390 million in negotiated Canadian government investment underway. The company was valued at $3 billion pre-money equity. Xanadu's technology uses photons as qubits at room temperature and is built around its PennyLane open-source software platform. Partnerships include Lockheed Martin for quantum machine learning research and Thorlabs for optical component manufacturing. (Sources: SEC Form 8-K from Crane Harbor dated March 19 announcing shareholder approval and March 27 trading date; Barron's April 20 reporting Xanadu shares surged 15 percent on debut as part of the broader SPAC quantum wave; SEC Form F-4 registration statement confirming $3 billion pre-money valuation and XNDU dual listing.)

Horizon Quantum listed in March also. The Singapore-based company closed its merger with dMY Squared Technology Group on March 19, beginning trading on Nasdaq under ticker HQ on March 20 with approximately $120 million in gross proceeds. Horizon is the first pure-play quantum software listing of the current wave, building programming tools that let software developers write quantum algorithms without physics expertise. The platform, called Triple Alpha, abstracts the hardware layer so developers can write code that runs across multiple quantum hardware backends including IBM, IonQ and Rigetti without rewriting for each. Partnerships include Alice and Bob for software tools and Singapore's first commercial quantum computer inauguration in January 2026. (Sources: SEC Form 6-K from Horizon Quantum Holdings dated March 19 confirming business combination close and HQ ticker; Quantum Computing Report May 2026 Q1 results confirming March 20 trading commencement; quantumzeitgeist.com Horizon profile confirming $508 million SPAC merger value and $120 million in gross proceeds.)

IQM Quantum Computers is the most recent, with shareholders voting to approve the merger with Real Asset Acquisition Corp on June 25 after the SEC declared the registration effective on June 5. The combined entity will list American Depositary Shares on Nasdaq under ticker IQMX. IQM is valued at $1.8 billion pre-money and the deal is expected to close imminently, providing over $450 million in combined cash including $134 million in PIPE financing and $175 million from RAAQ's trust account. IQM is Europe's first publicly listed quantum computing company and has delivered 18 of 23 sold quantum computers to customer premises, including the Euro-Q-Exa system at Leibniz Supercomputing Centre in Germany and systems in South Korea, Poland, Italy and Taiwan. Revenue was EUR 31 million in 2025. BlackRock provided a EUR 50 million pre-SPAC financing facility in March. (Sources: SEC Form 8-K dated June 5 announcing registration effectiveness and June 25 shareholder meeting; The Next Web March 2026 reporting the BlackRock EUR 50 million financing; minichart.com June 26 reporting shareholder approval of the business combination.)

Pending but confirmed: Pasqal announced on March 4 that it will merge with Bleichroeder Acquisition Corp II at a $2 billion pre-money valuation with a deal expected to close in the second half of 2026. The Paris-based neutral-atom company was co-founded by Nobel Prize winner Alain Aspect and Antoine Browaeys, has 275 employees, has deployed seven quantum computers and has three more in production. Customers include CMA CGM, Thales and LG Electronics. The deal includes $200 million in convertible financing and $289 million in SPAC trust cash, with a dual Euronext listing also planned. A $200 million private equity round was separately completed from Parkway, Quanta Computer, LG Electronics and CMA CGM.

Not yet public but watched: Quantum Motion, the London spinout of Oxford and UCL, raised a $160 million Series C in May 2026 co-led by DCVC and Kembara with a £40 million British Business Bank anchor. The company uses silicon CMOS transistors as the qubit substrate, identical to conventional chip manufacturing, and has deployed the world's first full-stack CMOS quantum computer at the UK National Quantum Computing Centre. CEO James Palles-Dimmock describes the goal as the transistor moment for quantum: when the underlying technology becomes manufacturable at scale in existing fabs. DARPA advanced them to QBI Stage B in late 2025. No IPO timeline has been confirmed publicly but analysts tracking the sector have Quantum Motion on the short list for 2027.

Quantum Computing IPO & SPAC Guide 2026 | Going Public Waveentangledfuture.com

[NightCrawler]

The five listings bringing the investable quantum universe from three to eight pure-play stocks is the capital markets inflection point the sector needed. Price discovery, analyst coverage and institutional portfolio construction all require minimum stock universe size. Eight is the beginning of a real sector

[Diane82]

Quantinuum closing flat on debut at $15.7 billion after pricing at $60 and opening at $68 is the result the article describes as a fizzle not a pop. For context IonQ's debut in 2021 was enthusiastic and then the stock declined substantially over two years. Flat on day one for a quantum company in 2026 is probably the more mature market response

[Candle]

Horizon Quantum being the first pure software layer listing is the one I find most strategically interesting. Hardware companies need massive ongoing capital for fabrication. A software platform business that runs on multiple hardware backends has fundamentally different economics and a clearer path to profitability

[Merchant97]

IQM having delivered 18 of 23 sold quantum computers at the point of SPAC approval is the revenue and deployment metric that distinguishes it from many quantum companies that have valuation claims but limited customer deployments. 18 actual systems in customer facilities is a genuine commercial track record

[Skibidi98]

Pasqal being co-founded by Nobel Prize winner Alain Aspect is the scientific credibility anchor that differentiates it from neutral-atom competitors. The Nobel was specifically for work on quantum entanglement and Bell inequality violations, directly foundational to quantum computing. That scientific lineage matters for enterprise customers evaluating quantum suppliers

[Forge37]

Quantum Motion's CMOS silicon strategy is the long game that makes the most sense if you believe the bottleneck to quantum at scale is manufacturing rather than physics. Every other approach requires purpose-built fabs or highly specialised environments. Silicon spin qubits built on GlobalFoundries 300mm wafer lines fit into existing semiconductor manufacturing without special facilities

[Cesaro27]

Xanadu's PennyLane software platform having an open source strategy around a proprietary hardware core is the same model that Red Hat used to build enterprise Linux. Make the tools free, make the enterprise deployment valuable. Whether photonic quantum has the hardware performance to sustain that model is the open question