Quantinuum is a company at the forefront of quantum computing, an industry that has seen surging investment and increasing breakthroughs over the last two years. Quantum technology uses qubits, rather than standard bits, to solve problems exponentially faster than classic supercomputers, and a high-profile demonstration of a 105-qubit processor by Google in 2024 set off a rush of investor interest.

Quantinuum, formed by a merger between Honeywell Quantum Solutions and Cambridge Quantum, combines cutting-edge trapped-ion hardware, high-fidelity quantum processors, quantum software toolkits, and even a quantum-enhanced cryptographic service. Such vertical integration positions Quantinuum as one of the only quantum computing companies able to offer complete solutions to customers, and in June of 2025 Quantinuum became the first company to create a fully fault-tolerant universal gate set with repeatable error correction. This breakthrough is recognized as the key precursor to scaleable, industrial quantum computing, making Quantinuum perhaps one of the few quantum computing companies with real revenue on the horizon.

Quantinuum is preparing to file for S-1 with the SEC, with the IPO expected sometime between 2026 and 2027, and the exchange currently unknown. Valuation estimates range from $15 billion to $20 billion, which could raise over $1.5 billion. In 2025, Quantinuum reached $115 million in revenue, meaning that Quantinuum could be trading at an extremely high P/S ratio of 130x to 170x.

This IPO comes with both challenges and opportunities. On one hand, quantum computing is still largely R&D-driven, meaning that the commercial model is relatively unproven. Quantum computing company valuations have become detached from conventional earnings multiples, as seen with competitor Rigetti — Rigetti sports a roughly $8 billion market capitalization on less than $10 million in revenue. Share dilution is also a real risk to future funding, and quantum computing companies burn cash – Rigetti diluted shareholders by 70% in a year because of cash constraints. Furthermore, Quantinuum may not be able to keep up with the pressure to show quarterly progress, especially when compared to giants like IBM and Microsoft.

On the other hand, the Quantinuum IPO’s potential $1.5 billion raise could allow Quantinuum to capitalize on their recent breakthrough, accelerating research and scaling their quantum hardware development. Many of Quantinuum’s rivals are very well-funded, so the cash influx could be crucial. Additionally, Quantinuum will receive something of a first-mover advantage — while there are a few other public pure-play quantum computing companies, Quantinuum is arguably the most advanced pure-play option. Furthermore, investors showed a strong appetite for high-growth tech IPOs in 2025, especially in frontier fields like AI and space.

There are a few key milestones that the quantum computing industry will need to achieve in order to gain mainstream investor confidence. On the technological side, quantum computing will need to make more progress towards creating fully fault-tolerant quantum bits, without which fault-tolerant universal gate sets have no use. Furthermore, the number of logical qubits needs to increase exponentially — quantum computers could potentially need one thousand stable logical qubits, and leading quantum computers have had just over one hundred. Investors will also need to see proof that quantum computing can have real-world applications outside of select demonstrations, such as chemical simulations or cryptography. 

This may be achievable. In 2024, IonQ’s 36-qubit system executed a medical device simulation 12% faster than a high-performance computing system, one of the first documented cases of quantum computing beating classical computing in an actually practical scenario. As the technology develops, efficiency gains will be a lot more than 12%. Additionally, qubit counts are constantly increasing. Quantinuum’s latest trapped-ion system reached a record quantum volume of 225 units, which is promising for logical qubit counts.

There is also one large commercial milestone needed to gain mainstream investor confidence — quantum computing will need to generate meaningful revenue, with paying clients and recurring usage. At the moment, the quantum computing industry is generating around $1 billion in revenue annually, and McKinsey predicts that the industry could generate $100 billion in revenue by the next decade. The QCaaS share of quantum revenue is increasing, while the hardware sale revenue share is expected to decrease, a positive sign for the adoption of quantum in commercial uses.

Now, where does Quantinuum stand technologically and commercially? Quantinuum has a quantum processor with 56 logical qubits currently, not yet approaching the 100 logical qubits count needed for truly practical processors. However, relative to competitors like IonQ, IBM, and Google, that 56-qubit processor is the highest performing one, and Quantinuum is overall the most technologically advanced quantum computing company. Commercially, Quantinuum is already gaining some traction. Quantum Origin, Quantinuum's quantum random number generator, was the first software of its kind to receive National Institute of Standards and Technology (NIST) validation, which may indicate potential government partnerships as federal agencies are mandated to shift towards post-quantum cryptography. Quantum Origin is also currently used by Keyfactor, Thales, Senetas, and other cybersecurity firms. Furthermore, Quantinuum’s revenue of around $115 million in 2025 is comparable or superior to its pure-play competitors, with IonQ generating $105 million in revenue, D-wave generating $24 million in revenue, and Rigetti generating just $7 million in revenue. To be clear, all these companies are operating at a loss right now, but overall Quantinuum has a sizable share of current projects.

That being said, I believe that quantum computing will have commercial applications by 2031, since in less than four years, the fault-tolerant universal gate set barrier was surmounted and qubit volumes have been steadily increasing. The next big hurdle is creating fully fault-tolerant quantum bits, but IBM has released a detailed framework for achieving this, in a large scale, by 2029. Quantinuum, too, believes that it will achieve this by 2029. Furthermore, partnerships are already being formed between quantum technology companies and pharmaceutical giants, financial applications are in the proof-of-concept stage, quantum computing is currently being used in basic material research, and cryptography is preparing for quantum computer decryption threats. Proprietary analyses reveal that by 2035, the quantum computing industry could be worth as much as $72 billion, with high single-digit billions being realistic by 2031.

Quantum computing funding is only increasing, especially in response to China’s recent funding push, and Quantinuum’s likely successful IPO will be a good measure of investor sentiment. Additionally, Quantinuum’s backing from Honeywell, a hardware giant, and Nvidia, which will partner with Quantinuum on its Nvidia Cuda-Q platform, makes Quantinuum well-positioned to be a long term winner — it already has “captive customers,” not to mention Airbus, BMW, and JPMorgan. Strong backing and strong funding rounds lead me to believe that of all pure-play quantum computing companies, Quantinuum seems the most likely to be able to ride out R&D costs. And as we saw with OpenAI previously, it’s often the pure-play options that have the most to gain when technology attains commercial uses, even when compared to tech giants like Microsoft and Google.

Given that Quantinuum is currently a leader of the quantum computing industry, the upcoming IPO seems like a promising investment. If quantum computing realizes its trillion-dollar potential and Quantinuum remains at the forefront, it can likely capture a meaningful share of long-term value just as it’s done in the short-term, justifying the extremely high P/S ratio. And if this potential is truly reached by 2031, which the industry appears to be trending towards — and importantly, Quantinuum has been on track with its overall roadmap so far — Quantinuum will likely be able to ride out any cash burn instead of falling behind its larger competitors. As long as 100 logical qubits in a quantum processor is achieved, with fully fault-tolerant quantum bits utilized, quantum computing will almost definitely have commercial applications. And if this is achieved by 2031, Quantinuum could remain at the industry forefront.

There is, of course, potential for failure. If sufficient fault-tolerant qubits remain elusive for too long, another qubit technology becomes decisively superior, or a longer-than-predicted R&D phase allows larger tech companies to overtake Quantinuum, an investment will fail. Nonetheless, Quantinuum stands out as one of the few pure-play quantum computing companies with a plausible path through the industry’s capital-intensive development phase, and I would bet on their success.