# What Does Five Years of Quantum Stock Data Actually Tell Us?

The single most clarifying number in five years of quantum equity markets: a daily return correlation of **0.89** across the three oldest pure-play quantum stocks in 2026, up from 0.14 when they first listed. That figure alone answers the question every quantum investor should be asking — whether they are picking companies or buying a sector. The data says sector, overwhelmingly.

Five years ago this month, Arqit, a British quantum encryption firm, became the first quantum company to ring the opening bell on a US exchange, briefly carrying a valuation of close to $3 billion. It is worth considerably less today. Seven pure-play quantum computing companies have since listed on American markets: [IonQ](https://quantumintel.tech/companies/ionq), [Rigetti Computing](https://quantumintel.tech/companies/rigetti-computing), [D-Wave Systems](https://quantumintel.tech/companies/d-wave-systems), [Infleqtion](https://quantumintel.tech/companies/infleqtion), [Quantinuum](https://quantumintel.tech/companies/quantinuum), [IQM Quantum Computers](https://quantumintel.tech/companies/iqm-quantum-computers), and [Pasqal](https://quantumintel.tech/companies/pasqal). A new equal-weighted Pure Play Quantum Index, constructed with daily closing prices from each company's first session through the end of August 2026, now provides the most comprehensive quantitative picture of that record to date.

The conclusion is uncomfortable for analysts and venture investors alike: **sector timing and macro conditions have explained almost everything**. Technology differentiation has explained almost nothing.

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## How the Eight Companies Got Here

[Arqit Quantum](https://quantumintel.tech/companies/arqit) opened the door in September 2021. IonQ followed in October 2021 with a first-day close of $9.20 and trades at $39.31 as of late August 2026 — the strongest absolute return in the cohort. Rigetti and D-Wave both listed in 2022 near ten dollars per share and are up 66% and 72% respectively from those reference prices.

Then came a long gap before the class of 2026 arrived in a cluster: Infleqtion in February, Quantinuum through a $60 IPO in June, IQM in July, and Pasqal at the end of August. Every 2026 newcomer with more than a week of trading is currently below its first-day close — they listed into a declining market after the sector peaked.

That peak matters enormously to the analysis. All three older names — IonQ, Rigetti, and D-Wave — hit their lows in the same few weeks of spring 2023 and peaked in the same week of October 2025, despite listing roughly a year apart. One was 38 months old at the peak, another 43, another 49. Their individual company timelines were irrelevant; the sector moved them in lockstep.

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## The Correlation Problem Is Severe and Getting Worse

The correlation data is the most damning element of the five-year record. In 2022, IonQ, Rigetti, and D-Wave had an average pairwise daily return correlation of just **0.14** — roughly what you'd expect from three small companies pursuing genuinely different technology paths. Trapped-ion systems, superconducting processors, and quantum annealing have little engineering overlap. The market initially priced them that way.

That number has risen every single year since. By 2026, it stands at **0.89** across the three pairs, with Rigetti and D-Wave at **0.93**. A single common factor now explains 93% of the group's daily variance. The market has collapsed three distinct quantum modalities into a single tradeable position.

This dynamic absorbed new entrants immediately. [Infleqtion](https://quantumintel.tech/companies/infleqtion) builds [neutral atom](https://quantumintel.tech/glossary/neutral-atom-qubit) systems with minimal engineering overlap with trapped ions or annealers. Within weeks of its February debut, its shares were moving with the incumbents at correlations of 0.7 to 0.8. The sector gravity was faster than any fundamental analysis.

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## Beta Has Been Rising Too — Painfully So on Down Days

The quantum cohort has always amplified broader market moves. Over their full trading lifetimes, the older names carry betas to the Nasdaq of around two. Over the past ninety sessions, that figure has risen to around three — meaning a 1% Nasdaq move has been worth roughly 3% in these stocks through the summer of 2026.

Crucially, the source data notes the older names carry **higher betas on index down days than on up days**. That asymmetry is precisely the wrong direction for risk management. These stocks fall harder than they rise relative to the index, which is a structural feature that new 2026 listings are already inheriting.

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## Alpha: Strongly Positive in the Rally, Severely Negative Since

Jensen's alpha strips out market exposure to isolate what a stock earned on its own merits. Run across the quantum cohort, it produces the clearest finding in the entire five-year dataset.

From the May 2023 lows to the October 2025 peak, every listed quantum company generated strongly positive alpha. Rigetti's annualized alpha exceeded **140% per year** during that window. D-Wave was not far behind. These were extraordinary numbers — but they were generated during a sector-wide re-rating that had no corresponding change in underlying technology progress.

In the eleven months since the October 2025 peak, every listed quantum company has generated strongly negative alpha, at annualized rates the source reports between **minus 54% and minus 123%**. Again, no corresponding reversal in technical progress. The alpha itself was the sector cycle, not a signal about individual company execution.

The implication for anyone modeling quantum companies on technology fundamentals is stark: those fundamentals have been a footnote to macro and sentiment.

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## IonQ Is the Best Survivor — Not a Demonstrated Alpha Generator

IonQ deserves careful treatment because it is the closest thing the record has to a winner, and the data supports only a specific version of that claim.

It holds the **only lifetime alpha that nets out positive**, at around 2% per year. It has the lowest volatility in the group, the shallowest maximum drawdown, and considerably more revenue per dollar of market value than any peer. A first-day buyer investing $1,000 at IonQ's October 2021 listing would have **$4,273** today, compared to $1,810 from the same money in a Nasdaq tracker. It is the only quantum listing to have beaten the index over the full period.

The path, however, ran through a low of **$337** — a 66% drawdown from the opening $1,000 — before recovery. And IonQ was not the largest winner from the shared 2023 trough. Rigetti and D-Wave, by virtue of their higher volatility, returned several times more from the common low. Higher volatility cut both ways.

Rigetti and D-Wave holders have approximately $1,700 each today against Nasdaq tracker values near $2,000 — positive in absolute terms, behind the market, and each stake was worth roughly **$40** at the 2023 lows.

Every buyer of this year's listings is below water while the broader index made a record in June.

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## What This Means for the Industry

The five-year record carries specific implications for quantum market participants beyond the trading data.

**For enterprise buyers:** The volatility of quantum equity markets is not a reliable signal about technology readiness. Rigetti's stock near forty cents in 2023 did not mean its superconducting processors stopped working. IonQ's current price reflects macro positioning more than trapped-ion gate fidelity improvements. Procurement decisions should be decoupled from equity price signals.

**For venture investors:** The data suggests that the window of public market entry matters more than the company selected for that window. The entire cohort bottomed together and peaked together. Timing the sector — not picking the name — has driven almost all realized returns.

**For analysts:** A 0.89 correlation means stock-specific research has had minimal marginal value for portfolio construction. Building differentiated models on [coherence time](https://quantumintel.tech/glossary/coherence-time) improvements or [logical qubit](https://quantumintel.tech/glossary/logical-qubit) roadmaps has not translated into differentiated returns. That may change as [fault-tolerant quantum computing](https://quantumintel.tech/glossary/fault-tolerant-quantum-computing) moves closer to commercial reality and investors can price specific technical milestones — but that shift has not happened yet in five years of data.

**For the 2026 class:** [Quantinuum](https://quantumintel.tech/companies/quantinuum), IQM, and Pasqal listed into a sector already in drawdown from its October 2025 peak. Historical patterns from the older names suggest recoveries take years, not months, and require a sector-wide catalyst rather than individual company news.

The structural question the Pure Play Quantum Index now poses is whether the arrival of commercially meaningful quantum hardware — systems demonstrating genuine [quantum advantage](https://quantumintel.tech/glossary/quantum-advantage) on economically relevant problems — will finally disaggregate the correlation. Five years of data says it hasn't happened yet.

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## Key Takeaways

- **Sector correlation dominates:** Daily return correlation among IonQ, Rigetti, and D-Wave has risen from 0.14 in 2022 to 0.89 in 2026, with a single factor explaining 93% of daily variance.
- **IonQ is the sole index-beater:** A $1,000 first-day investment is worth $4,273 today vs. $1,810 in a Nasdaq tracker — but the path ran through a $337 low.
- **Alpha tracked the cycle, not technology:** Rigetti generated alpha above 140% annualized during the 2023–2025 rally; every name has since generated alpha between minus 54% and minus 123% annualized, with no change in technical progress in either direction.
- **2026 listings are all underwater:** Quantinuum ($60 IPO), IQM, and Pasqal each entered a sector already past its October 2025 peak and below their first-day closes.
- **Arqit's five-year arc is the cautionary baseline:** The first quantum company on US exchanges, briefly near a $3 billion valuation, is worth considerably less today.
- **Beta asymmetry is a structural risk:** The older names carry higher betas on down days than up days relative to the Nasdaq — a pattern new 2026 entrants are already replicating.

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## Frequently Asked Questions

**Which quantum stock has performed best since listing?**
IonQ is the only pure-play quantum stock to beat the Nasdaq over its full listing lifetime, with a $1,000 first-day investment worth $4,273 as of late August 2026. Rigetti and D-Wave are positive in absolute terms but behind the index. All 2026 listings — Quantinuum, IQM, and Pasqal — are below their first-day closes.

**Why do quantum stocks move together even though they use different technologies?**
The data shows that despite distinct underlying technologies — trapped ion, superconducting, annealing, and neutral atom — quantum stocks now trade as a single sector position. Daily return correlations among the three oldest names have risen from 0.14 in 2022 to 0.89 in 2026, indicating macro sentiment and sector rotation dominate over company-specific technology signals.

**When did quantum stocks peak and bottom?**
All three older quantum listings (IonQ, Rigetti, D-Wave) hit their lows in the same few weeks of spring 2023 and peaked in the same week of October 2025, regardless of when each company listed. This synchronicity confirms the market moves the sector as a whole rather than pricing each company on its own timeline.

**What is the Pure Play Quantum Index?**
It is an equal-weighted index of all US-listed pure-play quantum computing companies, rebalanced monthly, constructed from daily closing prices from each company's first session through August 2026. The methodology is published alongside the index data.

**Has any quantum company demonstrated persistent alpha above its market exposure?**
IonQ holds the only lifetime alpha that nets out positive across the cohort, at approximately 2% per year annualized. No listed quantum company has demonstrated persistent alpha in the sense required to describe it as a durable source of returns independent of sector timing.