Microsoft stock sinks as new AI rival targets $27 billion business Faizan Farooque Wed, November 11, 2026 at 6:16 AM EST 1 min read MSFT +0.34% Trade MSFT on Coinbase Trading disclosure Trading disclosure The above button links to Coinbase. Yahoo Finance is not a broker-dealer or investment adviser and does not offer securities or cryptocurrencies for sale or facilitate trading. Coinbase pays us for certain activity generated through this link. Prices displayed are informational.
Shares of Microsoft Corp. (MSFT, Financials) slumped 2.2% after the artificial intelligence company AnthropicI9O unveiled a spreadsheet tool that might compete with one of Microsoft's oldest commercial apps, Excel.The news targets another popular Microsoft product as the corporation seeks to grow beyond its current AI offerings.Excel has been a staple of Microsoft's productivity software business for a long time, used by individuals and businesses that rely on spreadsheets for financial analysis, reporting and day-to-day work.The arrival of fresh AI tools into the market raises issues about how users develop and manage spreadsheets, and if that will alter.That sent Microsoft shares down in response, but the news itself is not a determinant of how much market share Anthropic may grab.Microsoft has its own AI agenda. The business has been integrating AI capabilities to its software products, providing users new ways to work within the apps they already use.That current client base might give Microsoft some ammunition to defend itself as competition heats up.The main concern for investors is whether AI-powered apps will drive new demand for productivity software, or put pressure on existing goods and price.Anthropic has yet to demonstrate it can match the reach of Excel with its spreadsheet product or replace Excel across huge enterprises.Coming up next: How quickly customers are adopting Anthropic's new tool, and how Microsoft is responding as competition in office software rises.
