Microsoft Falls 4.6% in Two Days as Anthropic’s Claude Sheets Takes Aim at Office

Finance
Written by Methodical Millions

Anthropic's new Claude Sheets, Whiteboards and Data tools are still basic, but Wall Street just showed how nervous it is about AI eating the software business, one week before Anthropic's own IPO.

By Methodical Jon | Nov 11, 2026

Microsoft (NASDAQ: MSFT) fell for a second straight day on Wednesday, November 11th 2026, after Anthropic launched a set of Claude workplace tools that take direct aim at Office. The stock dropped 2.2% to $533.16 USD on Tuesday, per TradingKey and Yahoo Finance, then slid about 2% more on Wednesday, according to CNBC. It closed Wednesday at $519.89 USD, down 2.49% on the day, per StockAnalysis closing data. That's roughly 4.6% wiped off in two sessions.

The drop stands out because the rest of tech had a great day. The Nasdaq gained 1.6% and the S&P 500 rose 1.3% as CoreWeave's results revived the AI trade, Reuters reported.

What Anthropic launched

"Starting today, Claude can build spreadsheets, whiteboards, and dashboards with your team," Anthropic said in its announcement, as quoted by Business Insider. Here's what's in the drop:

  • Claude Sheets (beta). Claude drafts and revises spreadsheets and marks each cell it changes so you can follow along. Files can be shared and exported as .xlsx or CSV, per Yahoo Finance.
  • Claude Whiteboards (beta). A shared canvas where a team works through ideas with Claude, then turns the result into a document or slide deck. It connects with Lucid, Miro and Vani by Zoho.
  • Claude Data. The tool formerly called Dashboards is now generally available. It lets employees query data in Amazon Redshift, BigQuery and ClickHouse.
  • Claude Meetings, which adds Claude to a call to take notes and act on what comes up, is marked "coming soon," per Yahoo Finance.

All of it is available on every paid Claude plan. Anthropic is also letting companies such as Adobe, Atlassian and HubSpot embed versions of their apps inside Claude, Investing.com reported, citing Bloomberg.

Context: basic tools, big reaction

Anthropic isn't claiming to replace Excel yet. Product leader Nicholas Lin told Bloomberg that Claude Sheets isn't designed for sophisticated financial modelling or heavy enterprise workloads, and that its integrations with existing spreadsheet software will stay more effective for that, per Investing.com.

Analysts were split on the real threat. Stifel's Brad Reback wrote that the launch "bears watching," but added, "we do NOT expect these products to have any meaningful impact on M365 growth rates for the foreseeable future," pointing to deep enterprise integration and security, according to Yahoo Finance. KeyBanc's Jackson Ader argued Monday.com, Asana and Zoom face more direct overlap, and all three traded lower on Tuesday.

There's also a twist. Microsoft is an Anthropic partner and investor. Anthropic committed in November 2025 to buy $30 billion USD of Azure computing capacity, and its amended IPO filing lists Microsoft as a buyer of about $1 billion USD of shares at the IPO price, per TradingKey. Investing.com also reports Microsoft is part of a separate $26 billion USD private placement tied to the offering. Microsoft is now backing a company that is building a rival to one of its biggest franchises.

Why it matters

Microsoft 365 is a huge part of Microsoft's business, and its revenue grew 16% last fiscal year, per Business Insider. Investors aren't worried about this exact version of Claude Sheets. They're worried about the direction. Instead of just adding AI to existing apps, Anthropic is building its own apps and positioning Claude as the screen people work from.

The timing is deliberate. Anthropic launched the tools alongside its IPO roadshow, according to Yahoo Finance. It reported an $81 billion USD revenue run rate as of October 31st in its filing and is seeking a fully diluted valuation of about $1.4 trillion USD, per Investing.com. A bigger slice of office software spending is part of how it justifies that price.

What to watch next

  • Anthropic's Nasdaq debut, expected next week. Strong demand would add pressure on legacy software names.
  • Adoption numbers. If Anthropic starts sharing usage figures for Sheets or Data, that's the first real test.
  • Microsoft's answer. Watch for new Copilot features or pricing moves in Office.
  • Claude Meetings. Once it ships, Zoom and the work-management apps are next in line.

The money lesson

1. A moat is only as wide as the switching cost. Microsoft's edge is that companies run on Excel and Outlook. Claude's play is to become the place you start the work so the app underneath matters less.

2. Markets price the future, not the product. Claude Sheets is basic today, and the stock still fell. Investors trade on where things could be in a few years.

3. Your partner can be your competitor. Microsoft supplies Anthropic's computing power and is buying its shares. In business, relationships are rarely just one thing.

For more on how headlines like this can move a stock, listen to Episode 30 - Moving Markets. Two days of selling on a product that's still in beta is a clear example of news, not numbers, driving the price.

At the time of writing (4:55 PM ET, Nov 11, 2026), Microsoft shares had closed at $519.89 USD. This article is for informational purposes only and is not financial advice.

Sources:

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This article may be AI-assisted and is subject to errors and omissions.

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