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Stock Market for July 27, 2026: Dow ends up 260 points and S&P 500 ekes out a gain; Nasdaq finishes lower on weakness in chips and tech stocks; Treasury yields and oil prices fall MarketWatchS&P 500 falls despite Iran fighting pause as chip stocks tumble: Live updates CNBCDow Jones Futures: U.S.-Iran Peace Hopes Send Oil Prices Plunging; Nvidia, Micron, Sandisk, SpaceX, Tesla Sell Off Investor's Business DailyStocks mixed, oil and Treasury yields drop on Iran-US pause Reut
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Tech group briefly becomes China's most valuable listed company in mainland's biggest IPO since 2010
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Microsoft unveils AI security tools it says outperform competing platforms Ars TechnicaMicrosoft touts cost-saving AI model for cybersecurity CNBCMicrosoft launches its first cybersecurity model, plus a new agentic cybersecurity system TechCrunchMicrosoft Launches Mythos Competitor, New Homegrown AI for Cybersecurity The Information
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Investors are fretting over a report that Nvidia could backstop an OpenAI data-center lease, in what would be the largest such arrangement yet.
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Investors are increasingly concerned over rush of borrowing to fund huge investments in data centres
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S&P 500 falls despite Iran fighting pause as chip stocks tumble: Live updates CNBCU.S. Stocks Mixed on Oil Relief, AI Doubts WSJStock Market Today: Dow rises, but S&P 500 and Nasdaq are dragged lower by weakness in chips and tech stocks; Treasury yields and oil prices fall; investors eye Fed decision and big tech earnings MarketWatchStocks mixed, oil and Treasury yields drop on Iran-US pause Reuters
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