Quantum computing stocks are likely to lead the decline if market conditions trigger a sell-off in speculative technology names this September. Market data shows that these stocks already exhibit high sensitivity to broad tech sector pullbacks. Investors should monitor macroeconomic catalysts like the September jobs report and upcoming Federal Reserve policy meetings as potential triggers for increased volatility.
Performance During Tech Downturns
Daily price data from 2026 reveals a pattern of disproportionate losses for quantum firms. Through August 28, the Invesco QQQ Trust fell by at least 1.5% on 23 separate trading days. During those downturns, the Nasdaq-100 tracker dropped an average of 2%. In 17 of those 23 instances, the median return for companies like IonQ, D-Wave Quantum, Rigetti Computing, and Quantum Computing Inc. was worse than the broader index. This equates to these stocks underperforming the tech sector on roughly 74% of those days.
While market history suggests September is often the worst month for the S&P 500, current sentiment remains fragile. Persistent inflation and high government debt levels amplify the risk for growth-stage companies. Even if business performance continues to show promise, the underlying valuation risk remains acute for investors holding these positions during market stress.
Valuation Risks for Quantum Players
Quantum computing companies trade at extremely high multiples of forward sales, signaling that buyers are pricing in massive future growth. IonQ trades at nearly 52 times forward sales, while Rigetti Computing is valued at more than 223 times forward sales. D-Wave Quantum sits at roughly 148.8 times forward sales. These figures contrast sharply with more established AI software players like C3.ai and BigBear.ai, which trade at significantly lower multiples of 6.9 and 10.1 times forward sales, respectively.
IonQ has demonstrated clear commercial momentum. Its second-quarter revenue grew 287% year over year to $80.1 million. The company's remaining performance obligations, a key indicator of future contract value, climbed 297% to $485 million. Management even raised their full-year 2026 revenue guidance to a range of $280 million to $290 million. Still, the current stock price implies that the market expects flawless execution. Any delay or shift in sentiment forces a repricing of these speculative assets.
Cash Reserves and Market Outlook
Some might argue that substantial cash piles protect these companies from short-term market fluctuations. Rigetti Computing held $541.3 million in cash and marketable investments at the end of the second quarter. D-Wave Quantum reported $546.2 million in similar liquid assets. IonQ reported roughly $3 billion in cash and investments, a figure recorded before accounting for its acquisition of SkyWater. These balances clearly lower the immediate risk of bankruptcy or the need for emergency financing.
However, liquidity does not equate to stock price stability. Valuation compression is a separate mechanic from operating runway. Even with healthy balance sheets, these stocks face downward pressure if investors rotate out of speculative growth categories. The sector has already seen significant corrections from 52-week highs, with some names falling by more than 70%. These declines demonstrate that the market is already sensitive to growth risks. The broader trend indicates that until these firms can prove consistent profitability or reduce their reliance on distant future projections, they remain at the front of the line during sell-offs in risky assets.