Rigetti Stock Tumbles 9% as Quantinuum's IPO Grabs Investor Focus

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Rigetti Computing shares fell nearly 9% on Tuesday as investors shifted attention to Quantinuum's blockbuster Nasdaq debut. Quantinuum raised about $1.68 billion in an upsized initial public offering and debuted with an approximate valuation of $15 billion, instantly becoming the largest publicly traded pure-play quantum computing company. The listing has reset valuation expectations across the quantum sector, introducing a new benchmark for assessing competitive positioning among companies such as Rigetti, IonQ, and D-Wave Quantum. Rigetti's recent execution has been improving, with first-quarter 2026 revenues of $4.4 million, up nearly 199% year over year, and the company ended the quarter with approximately $569 million in cash and no debt. The selloff in Rigetti appears to reflect capital rotation and a broader reassessment of relative value rather than any deterioration in the company's fundamentals.