Comparing IONQ and Rigetti: The Top Quantum Stock to Watch Before Q3 Earnings

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IonQ (IONQ) and Rigetti Computing (RGTI) are set to release their third-quarter 2025 earnings on November 5, 2025. IonQ anticipates revenues between $25–29 million for Q3 and has projected full-year revenues of $82–100 million. The company recently reported a 21.6% beat on revenue estimates, aided by a $1 billion equity raise increasing pro-forma cash to $1.6 billion.

In contrast, Rigetti reported a 41.6% drop in year-over-year revenues for Q2 2025, with estimates for Q3 revenues at $2.39 million, showing a modest 0.4% growth year-over-year. The company achieved a significant technical milestone with the rollout of the Cepheus-1-36Q, a multi-chip system achieving 99.5% fidelity in two-qubit gates.

IonQ’s projected EPS loss remains at 24 cents, while Rigetti’s is expected to be 5 cents, improving from the previous year. Both companies are currently rated Zacks Rank #3 (Hold), with IonQ appearing to have stronger investor confidence due to its liquidity and strategic partnerships.

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