TLDR
- Microsoft (MSFT) stock closed down 2.2% on Tuesday after Anthropic launched Claude Sheets, Claude Whiteboards and Claude Data.
- Claude Sheets builds full spreadsheets from simple prompts, and a beta is open to paid Claude subscribers.
- Microsoft 365 revenue rose 17% year over year last quarter to $27.8 billion.
- Microsoft is an anchor investor in Anthropic’s IPO, which is set to price on November 18.
- Anthropic will pay Microsoft up to $49.2 billion for compute capacity through 2033.
Microsoft (MSFT) stock fell 2.2% on Tuesday. It had opened the day roughly flat before the news landed.
The trigger was a product launch from Anthropic. The AI lab rolled out a trio of tools that look a lot like parts of Microsoft Office.
Claude Sheets lets customers build full spreadsheets from simple prompts. Teams can also organize data together in the same file.
BREAKING: Microsoft $MSFT falls 3% in just 30 minutes after Anthropic launches Claude Sheets, Claude Whiteboards and Claude Data.
Excel has owned the spreadsheet market for over 40 years. Now an AI company is coming straight for it. pic.twitter.com/arZIJrkWlE
— Bull Theory (@BullTheoryio) November 10, 2026
A beta version is open to paid Claude subscribers now. It is the closest thing yet to a direct rival for Excel.
Anthropic also released Claude Whiteboards, a shared tool for product management. Its data-visualization package, once called Dashboards, is now named Claude Data.
“Starting today, Claude can build spreadsheets, whiteboards, and dashboards with your team,” Anthropic said in its release. The company added that the tools work with Claude’s existing ability to create documents, slide decks and designs.
Why Microsoft Is Not Standing Alone
Microsoft declined to comment on the launch. The company does have deep ties to Anthropic, though.
Claude’s AI models are already available inside Excel through a partnership between the two firms. Microsoft is also building its own Copilot AI tool into its software.
Microsoft is one of the anchor investors in Anthropic’s pending IPO. Anthropic has agreed to pay Microsoft up to $49.2 billion for compute capacity through 2033.
The Microsoft 365 business is a big piece of the pie. Revenue there climbed 17% year over year last quarter to $27.8 billion, and commercial seats grew 5%.
Microsoft’s 2026 investor letter also shows consumer and commercial products and cloud services revenue in that segment rose 16% over the last fiscal year. So the unit is growing, not shrinking.
Software stocks have been through this before. They sank in the spring after Anthropic released tools like its coding agent, Claude Code.
That selloff has since eased. The iShares Expanded Tech-Software Sector ETF (IGM) is up 34% from its April 10 closing low, according to Dow Jones Market Data.
Backdrop for the Tech Sector
Tuesday’s drop landed in a shaky week for tech. Stocks led a rout last week after the midterms, as investors worried Democrats could slow data center development.
Hot inflation data and questions around Nvidia CEO Jensen Huang have kept nerves high this week. AI names have felt most of it.
Anthropic is pressing ahead anyway. It began its IPO roadshow this week and aims to price the deal on November 18, at a target valuation of $1.4 trillion.
