Key Points
Microsoft fell 2.2% to $533.16 on Tuesday after Anthropic unveiled Claude Sheets, Claude Whiteboards, Claude Data and Claude Meetings, a suite of workplace tools aimed squarely at Office. That's roughly $90 billion in market value gone in one session.
The same day, Anthropic's amended IPO filing set a price range of $70 to $78 a share, an implied valuation of up to $1.404 trillion, with Microsoft among six tech giants committing a combined $26 billion to a private placement alongside the deal.
October CPI rose 0.4% (core 0.3%), both hotter than forecast, and Fed Governor Christopher Waller said he backs a December rate hike and would consider a half-point move.
At 4:01 p.m., the Nasdaq was down 0.7%, the S&P 500 down 0.4% and the Dow down 0.3%.
Other software names slipped too: Salesforce fell 0.7% and Adobe 0.3%, while Nvidia tumbled 5.5% to $168.80 on the second day of its CEO probe.
Microsoft spent the last two years selling the world on one idea: AI would make Office more valuable, not less.
On Tuesday, a company Microsoft is investing in walked onstage in San Francisco and pitched a replacement.
Microsoft fell 2.2%, closing at $533.16, down from $545.18 on Monday. Last Wednesday, November 4, the stock closed at a record $555.80.
What Anthropic Actually Launched
At an event in San Francisco, Anthropic rolled out Claude Sheets, Claude Whiteboards, Claude Data and Claude Meetings, plus connectors that put Claude inside full versions of third-party software.
"Starting today, Claude can build spreadsheets, whiteboards, and dashboards with your team," the company said. "These work with its existing abilities to create documents, slide decks, and designs."
Spreadsheets. Documents. Slide decks. Meetings. That's Excel, Word, PowerPoint and Teams, the core of the Microsoft 365 franchise.
Claude Meetings joins a video call and starts working on tasks while people are still talking. It launches in beta on Anthropic's Team and Enterprise plans.
Shares slid before the event even began. Bloomberg reported the plans Tuesday morning, and by 12:45 p.m. the stock was down more than 3%.
Why This One Hurt
Two weeks ago Microsoft reported fiscal first-quarter revenue of $92.3 billion, up 19%. Azure grew 48%. Microsoft Cloud revenue hit $63.9 billion. Commercial remaining performance obligation, the backlog of contracted future revenue, jumped 73% to $677 billion.
But look at where the money comes from. Microsoft 365 commercial cloud revenue grew 17% last quarter, driven by higher revenue per user and upsells to premium tiers like Microsoft 365 Copilot.
That's the part Anthropic is aiming at. Microsoft's Office business is priced per seat. If an AI agent can build the spreadsheet, run the meeting and draft the deck, investors are starting to ask how many seats companies will need.
Salesforce fell 0.7% and Adobe slipped 0.3% as investors weighed the idea that AI agents are shifting from helpful features to outright replacements for traditional enterprise software.
We've watched this pattern before. When Google's stock got hit over a problem that had nothing to do with its user numbers, the market was pricing the business model, not the headcount.
The Strangest Part
Here's the twist.
Anthropic's amended filing on Tuesday also laid out its IPO. It plans to sell 825 million shares at $70 to $78 each, raising up to $64.35 billion. At the top of the range, it would be worth about $1.404 trillion on a fully diluted basis. It plans to list on the Nasdaq under the ticker "ANT," with pricing expected November 18 and trading November 19, according to people familiar with the plans.
Alongside the IPO, six tech giants have committed $26 billion to a private placement: AMD, Broadcom, Alphabet, Microsoft, Nvidia and TSMC.
So Microsoft is writing a check to the company that just took aim at one of its biggest franchises. Under a November 2025 alliance, Anthropic also committed to buy $30 billion of Azure compute.
That's the bind every incumbent is in right now. The AI labs are your biggest customers, your portfolio investments and your most dangerous competitors at the same time. If you've been tempted to panic buy Anthropic on day one, Tuesday showed exactly how much value can move the moment it ships a product.
Inflation Made It Worse
Anthropic wasn't the only problem.
The Bureau of Labor Statistics said consumer prices rose 0.4% in October, above the 0.3% economists expected. Core CPI, which strips out food and energy, rose 0.3% against a 0.2% forecast. It was the third straight month of CPI gains of 0.4% or more.
Before the report, Fed Governor Christopher Waller said he would support a quarter-point rate increase in December even if inflation cooled, and that a half-point hike should be considered if core CPI came in "around 0.3% or even higher." It did.
The 10-year Treasury yield climbed about 14 basis points to 5.00% Tuesday morning, and the 2-year jumped about 19 basis points. Fed funds futures had already fully priced in a December hike.
At 4:01 p.m., the Nasdaq was down 0.7% at 25,065.87, the S&P 500 was down 0.4% at 7,520.98 and the Dow was down 0.3%, or 157 points, at 52,233.08, giving back part of Monday's rally.
Higher rates hit growth stocks hardest. Last week we pointed out that Big Tech has been burning billions in cash while the oil majors printed money. Rising borrowing costs make that math harder.
What Lands Next
CoreWeave reports third-quarter results after Tuesday's close. Wall Street expects about $3.5 billion in revenue, but the focus is its $35.6 billion debt load. The stock has fallen about 40% in a month.
Wednesday is Veterans Day. Stocks trade, but the bond market is closed.
Cisco and Applied Materials report Thursday after the close. Options are pricing an 8% move in Cisco either way.
Nvidia reports on November 17. Anthropic is expected to price November 18 and start trading November 19. And the Fed meets December 8-9 with a hike now fully priced in.
Microsoft still has the cloud, the backlog and the customers. What it lost Tuesday was the assumption that nobody could touch Office.
This article is for informational and educational purposes only and does not constitute investment advice or a recommendation to buy or sell any security.
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