Quantum Computing Inc. (QUBT) Stock Price & How to Invest
Short answer
You can invest in Quantum Computing Inc. (QUBT) by buying shares or fractional shares at any major broker, through an ETF that holds it, or as one holding in a thematic basket. QUBT is a small photonics-and-quantum company building thin-film lithium niobate (TFLN) photonic chips, foundry services, and an entropy quantum computer (the Dirac), and the thesis is a pure-play bet on room-temperature, light-based quantum and photonics hardware reaching commercial scale. The single biggest risk is that this is a highly speculative, pre-commercial story: trailing revenue is only a few million dollars against a multibillion-dollar market value, so the price reflects expectations far more than current fundamentals.
QUBT stock price
As of 2026-06-26, Quantum Computing Inc. (QUBT) last closed at $9.18, down 46.9% over the past year. Over the past 52 weeks it has traded between $6.31 and $24.62.
Prices are daily closing prices from Yahoo Finance and may be delayed. For the live quote, check your broker or Quantum Computing Inc.'s investor relations page. Walnut is informational, not investment advice.
What does Quantum Computing Inc. (QUBT) do?
Quantum Computing Inc. (Nasdaq: QUBT), which operates as QCi, is an integrated photonics and quantum optics company. It designs photonic quantum machines, including its entropy quantum computer (the Dirac, marketed for binary and integer optimization problems), and develops thin-film lithium niobate (TFLN) chips for optical devices such as electro-optical modulators and frequency-conversion components. It intends to make money three ways: selling quantum machines to commercial and government customers, running a TFLN photonic-chip foundry for itself and outside customers, and providing semiconductor and packaging services. In June 2026 it completed the acquisition of NHanced Semiconductors for roughly $73 million in cash and stock to add fabrication, advanced-packaging, and engineering capacity.
The corporate entity traces back to a Nevada shell (Ticketcart, Inc., 2001) that redomiciled to Delaware and renamed itself Quantum Computing Inc. in 2018, began trading as QUBT, uplisted to Nasdaq in 2021, and merged with quantum-photonics developer QPhoton in 2022. This is an early-stage, speculative company: revenue is minimal and recent (driven by acquisitions such as Luminar Semiconductor and NuCrypt), it remains unprofitable with negative gross margins, and the business is still in the build-out and manufacturing-readiness phase (its Fab 2 plan) rather than at commercial scale.
What's driving Quantum Computing Inc. (QUBT)?
Photonics-first quantum approach
QCi's machines move light through engineered TFLN chips rather than relying on supercooled superconducting circuits. The company argues this allows room-temperature operation and lower energy use. If that architecture proves competitive, it differentiates QUBT from the cryogenic approaches that dominate the field.
Foundry and vertical integration
Beyond its own machines, QCi sells TFLN photonic-chip foundry services to outside customers and, with the 2026 NHanced Semiconductors acquisition, added fabrication and advanced-packaging capacity. This vertical integration is meant to turn the company into a chip supplier, broadening it beyond a single quantum product.
Government and institutional contracts
QCi has been awarded contracts including a TFLN photonic-chip contract tied to the U.S. Department of Commerce's NIST, and recent revenue stems from deals such as Luminar Semiconductor and NuCrypt. Government and institutional validation can lend credibility to an otherwise pre-revenue technology story.
Very large balance sheet
The company ended the first quarter of 2026 with roughly $1.4 billion in cash, equivalents, and investments, largely raised through equity issuance. That cushion funds the Fab 2 build-out and acquisitions for years, reducing near-term bankruptcy risk even while the business burns cash.
What are the risks to Quantum Computing Inc. (QUBT)?
The bear case is that valuation is disconnected from fundamentals: trailing revenue is only a few million dollars against a market value near $2 billion, implying a price-to-sales ratio in the hundreds. The company is unprofitable with negative gross margins and a large operating loss, and the cash hoard was built through dilutive share issuance that can continue. The stock is extremely volatile (a beta near 4 and a 52-week range of roughly $6 to $26), and it tends to move on quantum-sector sentiment and retail momentum rather than results, so sharp drawdowns are common.
How is Quantum Computing Inc. (QUBT) valued? (approximate, 2026-06-26)
A simple financial snapshot. These are approximations and refresh quarterly; for current figures see Quantum Computing Inc.'s investor relations page or your broker.
- Share price: ~$9.18
- Market cap: ~$2.07 billion
- Revenue (TTM): ~$4.3 million (minimal)
- Q1 2026 revenue: ~$3.7 million (up from ~$39 thousand a year earlier)
- Cash, equivalents and investments: ~$1.4 billion
- Profitability: Unprofitable; Q1 2026 net loss ~$4.05 million, negative gross margin
Valuation here is speculative, not fundamental. With only a few million dollars of trailing revenue against a roughly $2 billion market value, the implied price-to-sales ratio runs into the hundreds, and there are no positive earnings to anchor a P/E. The price reflects expectations for a still-pre-commercial technology, so figures can shift quickly and should be treated as a snapshot.
Who competes with Quantum Computing Inc. (QUBT)?
Pure-play quantum hardware companies
IonQ, Rigetti Computing, and D-Wave Quantum are the other small-cap, publicly traded quantum-hardware names retail investors often compare with QUBT. Each pursues a different physical approach (trapped ions, superconducting circuits, and quantum annealing respectively), and all share minimal revenue and high volatility.
Big-tech quantum programs
IBM, Google, Microsoft, and Amazon run large, well-funded quantum research efforts, often offered through their cloud platforms. They dwarf QUBT in resources and could set the pace and standards of the field, making them indirect but formidable competition.
Photonics and silicon-photonics players
Because QCi's wedge is thin-film lithium niobate and integrated photonics, it also overlaps with photonic-computing and silicon-photonics specialists (such as PsiQuantum and Xanadu on the quantum side) and established optical-component makers competing for foundry and chip business.
How to invest in Quantum Computing Inc. (QUBT)
There are three common ways to get QUBT exposure. Buy shares (or fractional shares) directly at any major broker. Hold an ETF that includes it, which spreads the position across many companies. Or build it into a focused thematic basket, so QUBT sits alongside other stocks that express the same thesis.
Walnut takes the basket route. Describe a thesis where QUBT fits (for example “AI infrastructure” or “dividend-growth large-caps”) and the AI proposes 5 to 6 constituents with target weights. You review the plan and fund it through your own broker when you're ready.
The bottom line on Quantum Computing Inc. (QUBT)
Right now QUBT is a speculative quantum and photonics hardware play with roughly $4 million in trailing revenue and a market value near $2 billion, meaning it trades at hundreds of times sales. If you believe TFLN photonics and entropy quantum computing become real commercial businesses, the question becomes sizing and overlap with your other bets, not timing; the risk is that the valuation is disconnected from today's fundamentals, dilution is ongoing, and the shares swing violently on sentiment rather than results.
More on Quantum Computing Inc. (QUBT)
Whether QUBT is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, what would have to go right, and the risks in is QUBT a buy?, and where the stock could go from here in the QUBT stock forecast.
For income investors, whether QUBT pays a dividend and how the payout looks is covered in does QUBT pay a dividend?
Build a basket around QUBT with Walnut
Use Quantum Computing Inc. as one constituent in a thematic basket Walnut's AI helps you assemble. Describe a thesis you believe in, the AI proposes the holdings and weights, and you approve before any broker order.
FAQ
What does Quantum Computing Inc do?
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QCi is an integrated photonics and quantum optics company. It designs photonic quantum machines, including its entropy quantum computer (the Dirac) for optimization problems, and makes thin-film lithium niobate (TFLN) photonic chips for itself and outside customers through a foundry. It targets commercial and government markets and is building out fabrication capacity.
Is QUBT a real quantum computing company?
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QUBT does build real quantum and photonics hardware, including its Dirac entropy quantum computer and TFLN chips, and has won contracts tied to bodies like NIST. That said, it is early-stage and pre-commercial: trailing revenue is only a few million dollars, so the business is far from proven at scale.
Is QUBT a good stock to buy right now?
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Walnut is not an investment adviser and cannot tell you whether to buy. Objectively, QUBT is a highly speculative quantum play with minimal revenue (around a few million dollars) and a multibillion-dollar valuation, so it trades on expectations and sentiment. Whether it fits depends on your goals, risk tolerance, and how much speculative exposure you already hold.
Why is QUBT so volatile?
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QUBT has minimal revenue, no profits, and a valuation built on future expectations, so its price reacts sharply to news, quantum-sector sentiment, and retail momentum rather than earnings. Its beta is near 4 and its 52-week range has run from roughly $6 to $26, meaning swings of tens of percent in short periods are common.
Is QUBT overvalued?
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By traditional measures QUBT looks extremely expensive: with only a few million dollars of trailing revenue against a market value near $2 billion, its price-to-sales ratio runs into the hundreds, and it has negative earnings. Whether that is overvalued depends entirely on whether you believe its technology becomes a large commercial business.
How much cash does QUBT have?
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QCi ended the first quarter of 2026 with roughly $1.4 billion in cash, cash equivalents, and investments, largely raised through equity issuance. That balance funds its Fab 2 build-out and acquisitions for years and reduces near-term solvency risk, though the company continues to burn cash and dilute shareholders to maintain it.
Is QUBT profitable?
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No. QUBT is unprofitable. In the first quarter of 2026 it reported a net loss of roughly $4 million on revenue of about $3.7 million, with negative gross margins and a sizable operating loss. Revenue is growing off a tiny base, but the company remains far from generating positive earnings.
What is the difference between QUBT, IonQ, Rigetti, and D-Wave?
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All four are small, publicly traded quantum-hardware companies with minimal revenue and high volatility, but they use different technologies. QUBT focuses on photonics and thin-film lithium niobate plus an entropy quantum computer, IonQ uses trapped ions, Rigetti uses superconducting circuits, and D-Wave centers on quantum annealing.
Walnut is informational, not investment advice. Financial figures on this page are approximations; always verify current numbers with Quantum Computing Inc.'s investor relations page or your broker before making investment decisions.