Stock Market Today, Sept. 23: IonQ Surges on Quantum Breakthrough and Nvidia Partnership
Today, Sept. 23, 2026, the trapped-ion quantum computing provider's decoder test and research-center collaboration kept commercialization progress in focus.
On September 23, IonQ's stock soared as the quantum computing company announced a significant breakthrough in error-correction technology and secured a partnership with Nvidia. Closing at $42.54, IonQ shares increased by 4.42%, outpacing its three-month average trading volume of 21.0 million shares by 233%. The company's IPO occurred in 2021, and since its public debut, it has grown by 294%.
Despite a tech downturn, IonQ defied the broader market trends. The S&P 500 and Nasdaq Composite both experienced slight declines, with the S&P 500 falling by 0.75% to 7,706 and the Nasdaq Composite dropping 1.13% to 26,936.
Among competitors in the quantum computing hardware, software, and cloud-access services sectors, Rigetti Computing and D-Wave Quantum also saw declines. Rigetti Computing closed at $16.00, down 3.12%, while D-Wave Quantum closed at $16.81, falling 4.27%. Investors appear optimistic about IonQ's advancements, betting on the company's potential leadership in the quantum computing space.
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