Why Quantum Computing Stock Is Plummeting Today
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By Keith Noonan – Mar 3, 2026 at 12:05PM ESTKey PointsQuantum Computing's Q4 report arrived with a smaller-than-expected loss and a miss on sales. The company issued some very encouraging guidance for this year. The stock is still seeing a big sell-off today due to concerns about the U.S. and Israel's war with Iran. Quantum Computing (QUBT 6.29%) stock is falling Tuesday as investors react to geopolitical risks. The company's share price was down 9% as of noon ET amid the backdrop of a 1.4% decline for the S&P 500 and a 1.7% decline for the Nasdaq Composite. Quantum Computing published its fourth-quarter results after the market closed yesterday and reported revenue that missed Wall Street's target and earnings that topped the forecast. While the company's Q4 report arrived with mixed results, its sell-off today appears to be primarily driven by bearish sentiment connected to potential fallout from the U.S. and Israel's war with Iran. Quantum Computing's Q4 report actually arrived with some encouraging news Quantum Computing reported a loss of $0.01 per share on sales of roughly $198,000 in the fourth quarter. While the company's loss was $0.01 per share lower than the average analyst estimate, revenue missed the forecast by roughly $190,000. ExpandNASDAQ: QUBTQuantum ComputingToday's Change(-6.29%) $-0.54Current Price$8.05Key Data PointsMarket Cap$1.9BDay's Range$7.70 - $8.2852wk Range$4.37 - $25.84Volume364KAvg Vol16MGross Margin-77783.88% On the other hand, the company confirmed that it had completed its acquisition of Luminar Semiconductor last month. While management said that they were not giving official guidance for this year, the team did issue some encouraging commentary. Chief financial officer Christopher Roberts noted that analysts had been calling for the business to post sales between $20 million and $25 million this year and said that he thought those estimates were reasonable. Geopolitical volatility is roiling the market Oil prices are surging, and there are additional risks of supply chain disruptions. Both of these dynamics could lead to higher inflation, which could in turn make the Federal Reserve more likely to hold off on interest rate cuts -- or even raise rates if necessary. None of these dynamics is favorable for growth-dependent tech stocks, and speculative quantum computing plays could continue to get hit hard if bearish pressure intensifies across the broader market. Read NextFeb 25, 2026 •By Rich SmithWhy Did Quantum Computing Stock Pop Today?Feb 15, 2026 •By Johnny RiceIs Quantum Computing Stock Going to $0?Jan 25, 2026 •By Rich SmithPrediction: This Quantum Computing Stock Will Skyrocket in 2026Jan 25, 2026 •By Lyle DalyHere's Why I Wouldn't Touch Quantum Computing Stock With a 10-Foot PoleJan 23, 2026 •By Leo SunForget Quantum Computing Stock: Buy This Dividend‑Paying Quantum Pioneer, And Never SellJan 18, 2026 •By Keith NoonanWhy Quantum Computing Stock Plummeted 38% Last Year but Is Soaring in 2026About the AuthorKeith Noonan is a contributing writer at The Motley Fool covering technology, consumer goods, and other sectors. He holds a bachelor’s degree in English from Boston College.TMFNoonsStocks MentionedQuantum ComputingNASDAQ: QUBT$8.05(-6.29%)-$0.54S&P 500 IndexSNPINDEX: ^GSPC$6,824.67(-0.83%)-$56.95NASDAQ Composite IndexNASDAQINDEX: ^IXIC$22,567.06(-0.80%)-$181.79*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.