This Is the Quantum Computing Stock Billionaires Want to Own for 2026 (Even Warren Buffett) -- and It's Not IonQ, Rigetti Computing, or D-Wave Quantum

Pure-play quantum stocks such as IonQ, Rigetti, D‑Wave and Quantum Computing Inc. have surged—up to ~810% over the trailing 12 months—but Form 13Fs for Q3 show most billionaire money managers avoided these loss‑making, cash‑burning names and instead accumulated Alphabet; notable buys included Warren Buffett (17,846,142 Class A shares), Philippe Laffont (5,210,434 GOOGL and 2,091,574 GOOG) and Stanley Druckenmiller (102,200 GOOGL), and Alphabet is a top holding at Baupost, Tiger, Pershing Square and Fundsmith. Investors’ preference reflects Alphabet’s clear advantages: a dominant search/ad franchise (89–93% share), YouTube scale, a fast‑growing Google Cloud (>30% YoY with #3 market position), a recently unveiled Willow quantum processing unit that ran a quantum algorithm ~13,000x faster than the fastest supercomputer, and ample war chest ($98.5bn cash and $112bn operating cash flow in the first nine months of 2025). Given BCG’s $850bn addressable quantum market by 2040, the takeaway for allocators is that capital‑rich, diversified incumbents are being favored as the pragmatic way to gain quantum exposure while pure plays face prolonged commercialization risk, dilution and potentially frothy valuations.

Analysis

Pure-play quantum computing stocks IonQ, Rigetti Computing, D-Wave Quantum and Quantum Computing Inc. have rallied as much as ~810% over the trailing 12 months (through Dec. 5, 2025), yet Q3 Form 13Fs show major billionaire asset managers largely avoided these names. Instead, several billionaires accumulated Alphabet: Warren Buffett (17,846,142 Class A shares), Philippe Laffont (5,210,434 GOOGL and 2,091,574 GOOG) and Stanley Druckenmiller (102,200 GOOGL), and Alphabet is a top holding at Baupost, Tiger, Pershing Square and Fundsmith.

Alphabet’s investment case combines a dominant search/ad franchise (89%–93% share) and YouTube scale with a fast-growing Google Cloud (>30% YoY sales growth) and deep liquidity ($98.5bn cash; $112bn operating cash flow in the first nine months of 2025). Its Willow quantum processing unit—unveiled Dec. 2024—ran a quantum algorithm reportedly ~13,000x faster than the world’s fastest supercomputer, giving Alphabet capital-rich optionality in quantum hardware.

Pure-play quantum names remain unprofitable, burning cash and likely to raise capital (dilution risk), and the article flags frothy valuations versus historical P/S bubble benchmarks (30–40) even under aggressive revenue scenarios through 2028. With a BCG estimate of up to $850bn addressable quantum market by 2040, billionaire positioning signals a preference for diversified, cash-generative incumbents to access quantum upside while commercialization risk for pure-plays persists.

Key Decisions for Investors

• Consider allocating to Alphabet for pragmatic quantum exposure within a diversified, cash-generative business that billionaires have materially added to and which reports meaningful Google Cloud growth and Willow progress
• Limit direct exposure to pure-play quantum names to a small, speculative sleeve given their ongoing losses, cash burn, high dilution risk and potentially frothy P/S valuations
• Monitor near-term catalysts before increasing exposure: pure-plays' cash runway and announced financings, concrete commercial revenue milestones, and Alphabet's Google Cloud monetization and Willow commercialization updates
• Use valuation guardrails (e.g., require sustained revenue growth and improving margins or reasonable P/S multiples) before scaling positions in pure-play quantum stocks