Anthropic's new Claude spreadsheet tools weigh on Microsoft shares

Microsoft shares fell about 2 to 2.5% on Wednesday, November 11, 2026, after Anthropic unveiled Claude Sheets, an AI spreadsheet tool aimed squarely at Excel, along with a push to bring meetings and collaboration into Claude. Investors are concerned that business customers could begin handling core productivity work outside Microsoft 365, the recurring-revenue engine built on per-seat subscriptions and Copilot add-ons. The move adds a competitive question to the existing debate over Microsoft's AI infrastructure spending.

1. Anthropic unveiled Claude Sheets, an AI-powered spreadsheet tool that competes with Microsoft Excel, at a San Francisco event on Tuesday, November 10, 2026.
2. MSFT traded down roughly 2.2% to 2.5% on Wednesday, November 11, 2026, per Benzinga market reports.
3. Investors cited risk to the Microsoft 365 franchise, where per-seat subscriptions and Copilot add-ons drive a large share of recurring revenue.
4. Benzinga market coverage on November 11, 2026 also noted the sell-off in MSFT alongside a broader Nasdaq 100 gain.