Microsoft Stocks Decline 2.5% as $1 Billion Anthropic Stake Tests Partner-Rival Balance Khac Phu Nguyen Wed, November 11, 2026 at 11:54 AM EST 1 min read MSFT -2.32% ANTH.PVT Trade MSFT on Coinbase Trading disclosure Trading disclosure The above button links to Coinbase. Yahoo Finance is not a broker-dealer or investment adviser and does not offer securities or cryptocurrencies for sale or facilitate trading. Coinbase pays us for certain activity generated through this link. Prices displayed are informational.
Microsoft (NASDAQ:MSFT) shares decline by 2.5% at 10.30 a.m. ET on Wednesday, November 11, in regular trading, after Anthropic's amended IPO filing put Microsoft among seven strategic buyers in a $26 billion concurrent placement. Microsoft's slice is about $1 billion, or 13,513,513 shares at the $74 midpoint.
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The filing says Claude is sold through AWS, Google Cloud and Microsoft Azure under joint go-to-market arrangements in which Anthropic pays each cloud provider a fee. Anthropic also discloses about $900.9 billion of aggregate committed spend on purchase commitments and leases, mostly for compute and infrastructure, without a breakdown by counterparty. Fortune reported that the offering could value Anthropic at up to $1.4 trillion on a fully diluted basis.
The $1 billion stake equals roughly 0.03% of Microsoft's $3.97 trillion market value, so its importance is positional. Microsoft gains exposure to a fast-growing model maker that already routes revenue through Azure, while hedging against a single-partner AI strategy. The risk is that Claude could increasingly compete with Microsoft's own software. GuruFocus gives Microsoft a perfect GF Score of 100/100, with Profitability Rank 10/10, GF Value Rank 10/10, Momentum Rank 10/10 and Financial Strength 8/10. At $532.44, the shares trade 11.5% below GuruFocus's GF Value of $601.35, which GuruFocus calls "Modestly Undervalued." Watch for any Azure-specific disclosure of Anthropic spending.
