Quantum Startups Are Going Public Into a Storm

One company's stock dropped more than 30% after its debut. Its CEO said the timing was perfect.

That's the paradox at the heart of quantum computing's public market moment. In the first three months of 2026, three quantum firms—Infleqtion, Horizon Quantum, and Xanadu Quantum—have listed on US exchanges through SPAC mergers despite some of the most volatile market conditions in recent memory. The results have been rough: Horizon is down 18% since its March 20 debut, Infleqtion has shed more than 30% since February, and Xanadu—which rallied 15% on its first day—slid more than 10% in after-hours trading the same evening.

And yet, not one of these companies is expressing regret.

From Science Experiment to Business Plan

To understand why these firms are listing now, you have to understand what changed in the past 18 months.

Quantum computing works by exploiting the principles of quantum mechanics—superposition and entanglement—to process information in ways that classical computers fundamentally cannot. The potential applications are vast: drug discovery, materials science, cryptography, logistics optimization, financial modeling. The problem has always been reliability. Quantum systems are extraordinarily sensitive to environmental interference, causing errors that make them impractical for real-world use.

But between 2024 and 2025, the field crossed several meaningful thresholds. Multiple research groups demonstrated improved quantum error correction, a critical prerequisite for building machines that actually work. Qubit counts rose—more qubits means more computational complexity—and coherence times lengthened, reducing the noise that corrupts calculations.

"We're really starting to hit something of an inflection point," said Dr. Joe Fitzsimons, founder and CEO of Horizon Quantum, in an interview with CNBC. "There has been a significant number of breakthroughs over the past 18 months."

Velu Sinha, a partner at Bain & Company, put a number on what's coming: the first demonstrations of practical quantum advantage—the point where a quantum computer outperforms the best classical supercomputer on a real problem—are expected around 100 logical qubits, a threshold the industry is approaching by 2028–2029. For commercially transformative applications like drug discovery or large-scale logistics, you'll need 1,000 to 10,000 logical qubits, which puts the timeline closer to the mid-2030s.

The addressable market at full maturity? Estimated at $100 to $250 billion.

Why SPACs, and Why Now

All three companies bypassed traditional IPOs in favor of SPAC mergers—deals with shell companies that offer a faster, less scrutinized path to public markets. This route was pioneered in quantum by IonQ in 2021, which became the first pure-play publicly traded quantum computing company through a dMY Technology Group blank-check vehicle.

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The SPAC path makes strategic sense for early-stage deep tech. Traditional IPO underwriters want predictable revenues and clear near-term growth. Quantum companies, by definition, can't offer that yet. SPACs let them tell a longer story to a more patient audience.

But the audience isn't infinitely patient. The post-debut selloffs suggest that retail and institutional investors are grappling with a genuine tension: they believe in the technology's eventual importance, but they're unsure whether these companies, at these valuations, at this moment, are the right bet.

"Quantum is one of a small number of technology categories investors view as structurally inevitable," Sinha told CNBC. "The addressable market gives patient capital a reason to look past near-term volatility."

The key word is patient.

Three Companies, Three Strategies

What's notable is how differently each company is positioning itself for the long wait until full-scale quantum advantage.

Horizon Quantum has built software tools that run on both classical and quantum systems—meaning it can generate revenue today, before large-scale quantum hardware becomes viable. The newly raised public capital will fund team expansion and an early-access software rollout later this year.

Xanadu Quantum, an Nvidia partner, has invested in cloud-based platforms that let developers pay to experiment with quantum algorithms using existing hardware. It's a developer ecosystem play—build the community now, monetize the infrastructure later.

Infleqtion is taking a staged approach: near-term revenue from quantum sensing and timing applications (already commercially relevant), with quantum computing expanding as hardware performance scales. "Commercialization will happen in stages," CEO Matthew Kinsella told CNBC.

This divergence matters for investors. These aren't interchangeable bets on "quantum." They're bets on different timelines, different technical approaches, and different theories of where the first real money will come from.

The Big Players Are Watching From the Sidelines

One conspicuous absence from the SPAC wave: the tech giants. Alphabet, Microsoft, Amazon, and IBM have collectively poured billions into quantum research. None of them have spun out standalone public quantum entities.

That's not an accident. For hyperscalers, quantum is a long-term infrastructure bet that fits neatly inside their existing R&D budgets. They don't need public capital. They can afford to wait.

For the startups, waiting isn't an option. Going public is how they fund the next five years of research while the technology matures. The risk is that the window between "interesting enough to list" and "actually generating meaningful revenue" is longer than investors' tolerance for losses.

As Marc Einstein, research director at Counterpoint Research, put it: the future where large organizations own quantum machinery and offer it as a cloud service could arrive much sooner than the future where quantum computing is ubiquitous. That's the near-term business model—and it's the one these companies are racing to own.