Key Highlights

● Microsoft fell 2.61% to $519.22 for a second straight session.

● Anthropic launched Claude Sheets, Meetings and Whiteboards, competing with Microsoft 365 and Copilot.

● Fiscal first-quarter Revenue rose 19% to $92.3 billion, with Azure growth of 48%.

● Microsoft Ignite, running Nov. 17-20, is the next test for Copilot's position.

What made Microsoft (NASDAQ:MSFT) stand out on Wednesday was the direction of its move. While chip and AI infrastructure stocks rallied hard, the software giant slid for a second straight day, falling 2.61% to $519.22 on 7.00 million shares. Microsoft was among the S&P 500's midday laggards on a day when the index rose 1.31% and the Nasdaq Composite gained 1.60%. The selling picked up a theme from the previous session: Anthropic's push into the office software that has long been Microsoft's most dependable profit engine.

The news behind the move

On Tuesday, Nov. 10, Anthropic unveiled a set of workplace products in San Francisco. They include Claude Sheets, a Beta spreadsheet tool that can build and edit spreadsheets, insert formulas and export Excel or CSV files; Claude Meetings, which can join Google Meet calls, take notes and identify action items; and Claude Whiteboards, a shared space for developing ideas. The launch also expanded plugins that let Claude work directly inside applications from partners including Adobe (NASDAQ:ADBE), Atlassian (NASDAQ:TEAM) and HubSpot (NYSE:HUBS). The tools compete more directly with Microsoft's Copilot and Microsoft 365. It marks Anthropic's first step into office software, a market led by Microsoft and Google.

Microsoft fell 2.20% to $533.16 on Tuesday, after dropping as much as 3% midday in a move tied to the Anthropic tools. Even so, Microsoft overtook Nvidia (NASDAQ:NVDA) that day as the world's second most valuable company for the first time since June 2025because Nvidia fell even harder. Wednesday extended the decline. The picture is complicated by how intertwined the two companies are. Anthropic's amended IPO filing lists Microsoft among seven strategic buyers in a $26 billion concurrent placement, taking roughly $1 billion of stock at the $74 midpoint of the range. In November 2025, Anthropic committed to buy $30 billion of Azure computing capacity, and Microsoft agreed to invest up to $5 billion. Claude is sold through Azure, so Anthropic is at once a customer, an investee and a rival.

A separate policy story also touched the stock. Microsoft and industry groups are asking the Trump administration to reconsider a proposed ban on certain Chinese-made optical transceivers used in AI data centers, warning that restrictions could raise costs and delay construction.

What Microsoft does

Microsoft sells cloud infrastructure through Azure, productivity software through Microsoft 365, and a portfolio that includes Windows, LinkedIn, search Advertising and Xbox. Its AI strategy spans its Copilot assistants, its Investment in OpenAI and a vast build-out of data centers. It is one of the most widely held stocks in the world, with a place in the Dow Jones Industrial Average, the S&P 500 and the Nasdaq-100.

Recent results

The fundamentals heading into this week looked strong. For its fiscal first quarter, reported Oct. 28, Microsoft posted revenue of $92.3 billion, up 19%. Operating Income rose 21% to $45.9 billion, and GAAP Earnings Per Share climbed 32% to $4.92. Microsoft Cloud revenue grew 30% to $63.9 billion, Azure grew 48%, and commercial remaining performance obligation, a measure of contracted future revenue, jumped 73% to $677 billion. Chief financial officer Amy Hood said results exceeded expectations on revenue, operating income and earnings per share.

Under segments recast in September, Agents and Infra revenue rose 25% to $76.8 billion, while Devices and Consumer slipped 3% to $15.5 billion, dragged by a 22% drop in Windows OEM and devices. Microsoft 365 commercial cloud, the part of the Business most relevant to the Anthropic debate, grew 17% as reported. The OpenAI stake also swung from a drag to a small contributor, adding $0.03 a share versus a $0.41 hit a year earlier.

Guidance points to more of the same. Microsoft expects December-quarter revenue of $96.0 billion to $97.1 billion and Azure growth of 49% to 50%, with Capital Expenditure above $50 billion for the quarter. Fiscal first-quarter free Cash Flow was $18.6 billion. Quarterly capex was $39.4 billion, roughly double the prior year.

Valuation

Microsoft's trailing price-to-earnings ratio is about 27, above Amazon (NASDAQ:AMZN) at about 22, Meta (NASDAQ:META) at about 22 and Alphabet (NASDAQ:GOOGL) at about 15, but well below Apple (NASDAQ:AAPL) at about 39. With a Market Value of roughly $3.86 trillion, the stock has pulled back from its Nov. 4 record of $559.15. One valuation model estimates a Fair Value of about $601 and calls the shares modestly undervalued, while Wall Street targets include $700 at UBS, $650 at TD Cowen and $640 at RBC.

Bull and bear cases

Bulls see Wednesday's drop as a reaction to headlines rather than numbers. Azure is accelerating, Demand still outstrips Supply according to management, and $677 billion of contracted commercial revenue gives unusual visibility. The Anthropic relationship, in this view, is a hedge: Microsoft gets paid when Claude runs on Azure and owns a slice of the company if it succeeds.

Bears argue the threat is real. Microsoft 365 has long dominated workplace software, and capable AI-native rivals could pressure pricing or slow Copilot adoption. Meanwhile, spending is soaring, with quarterly capex now in the tens of billions, raising questions about returns if AI demand cools. Policy risk around data-center components adds another layer of uncertainty. Microsoft's role as a top holding in the Roundhill Magnificent Seven ETF also leaves it exposed to swings in sentiment toward the group as a whole.

Ignite, Azure and Key Support Levels

The near-term catalyst is Microsoft's Ignite conference, running Nov. 17-20 in San Francisco, where investors will want a clear answer on Copilot's competitive position. Investors will also watch for any Azure-specific disclosure of Anthropic spending, the outcome of the optical transceiver debate in Washington, and whether the stock holds technical support near $505, a level that has been flagged. Longer term, the December-quarter report will test whether Azure's 49% to 50% growth guidance holds up against the company's heavy spending.