Prediction: Quantum Computing Stocks IonQ, Rigetti Computing, and D-Wave Quantum Will Plunge 50% (or More) in 2026

While pure-play quantum computing stocks, including IonQ, Rigetti Computing, D-Wave Quantum, and Quantum Computing Inc., have experienced significant gains of 123% to 2,090% over the past year, the article warns of a potential 50% or greater plunge by 2026. This bearish outlook is attributed to the technology's nascent commercialization, substantial operational losses incurred by these companies, and historically unsustainable valuations with price-to-sales ratios reaching up to 5,983. Historical precedents for hyped technologies, coupled with the S&P 500's currently elevated Shiller P/E ratio, suggest these stocks are poised for a significant correction.

Analysis

Pure-play quantum computing stocks, including IonQ, Rigetti Computing, D-Wave Quantum, and Quantum Computing Inc., have experienced substantial gains of 123% to 2,090% over the past year, surpassing AI as a growth trend in 2025. Despite the technology's potential to generate $850 billion in global economic value by 2040, a strongly negative sentiment (-0.8) and bearish tone indicate a high probability of a significant market correction for these stocks, with predictions of a 50% or greater plunge by 2026. This outlook is primarily driven by the nascent stage of quantum computing's commercialization and historical patterns of overhyped technological trends.

These companies exhibit concerning financial fundamentals; for instance, IonQ reported 222% sales growth to $39.9 million in the September-ended quarter, yet its operational loss ballooned to $168.8 million from $53.1 million year-over-year. Rigetti Computing also saw its operational loss increase to $20.5 million in the third quarter. Such substantial losses necessitate significant capital raises, with IonQ announcing a $2 billion equity offering, suggesting a high likelihood of future dilution for existing shareholders across the sector.

Valuations for these quantum computing pure-plays are deemed historically unsustainable, with trailing-12-month price-to-sales (P/S) ratios ranging from 172 for IonQ to an extreme 5,983 for Quantum Computing Inc. These figures far exceed the 30-40 P/S ratio ceiling observed during the dot-com bubble for leading companies like Cisco and Microsoft. Furthermore, the broader market's elevated S&P 500 Shiller P/E ratio, which peaked at 41.20 (the second-highest since 1871), suggests a potential 20%+ market correction, which would disproportionately impact these highly valued and speculative assets.

Key Decisions for Investors

• Investors should exercise extreme caution with pure-play quantum computing stocks due to their unsustainable valuations, significant operational losses, and high potential for dilution through future capital raises.
• Consider historical precedents of nascent technologies and the current elevated Shiller P/E ratio of the S&P 500, which suggests a broader market correction could severely impact these high-beta, high-valuation assets.
• Monitor commercialization progress and profitability metrics closely, as current market enthusiasm appears to be speculative rather than fundamentally driven.