Microsoft faces securities fraud suit over Copilot claims after 10% drop

A class action lawsuit filed July 24 in the U.S. District Court for the Western District of Washington accuses Microsoft Corp. and senior executives of securities fraud for making false statements about its Copilot AI platform, which the company had touted as a key growth driver for its Azure cloud business. The complaint, brought by Bleichmar Fonti & Auld LLP, alleges that Microsoft failed to disclose severe functionality issues with Copilot that caused user adoption to fall well short of internal and analyst expectations.

"Microsoft consistently touted Copilot's best-in-class capabilities, which purportedly drove widespread and growing user adoption, but in truth, Copilot suffered from severe functionality issues that caused user adoption to decline and put Microsoft's Azure revenue at risk," the complaint states, according to a copy reviewed by Edgen.

The alleged disclosures came into focus on Jan. 28, 2026, when Microsoft reported fiscal second-quarter results that showed Azure growth had slowed suddenly. Chief Financial Officer Amy E. Hood attributed the deceleration to computational capacity constraints, saying the company had diverted CPU and GPU capacity from Azure to Copilot applications and AI-related research and development. Microsoft also revealed that capital expenditures had reached $37.5 billion in the quarter, bringing first-half CapEx to $72.4 billion — compared with $88.2 billion for all of fiscal 2025. The company disclosed that paid Microsoft 365 Copilot seats totaled only 15 million, a fraction of the more than 450 million commercial Microsoft 365 users and materially below analyst estimates.

The stock fell $48.13, or 10%, to $433.50 on Jan. 29, wiping out roughly $360 billion in market value. The decline deepened after The Wall Street Journal reported Feb. 3 that Copilot was losing market share to rivals such as Google's Gemini, citing "confusing brand positioning and interoperability problems." A subsequent Journal report on March 17 detailed a reorganization of Microsoft's Copilot product teams aimed at unifying commercial and consumer versions.

The Four Allegations

The complaint, which seeks class certification for investors who purchased Microsoft shares between May 1, 2025, and Jan. 28, 2026, alleges four specific failures to disclose: that Copilot had significant brand positioning, user experience and interoperability problems; that Microsoft's flagship proprietary AI model ranked below competitors on benchmark tests; that the company needed to increase CapEx by billions of dollars and divert GPU and CPU capacity away from Azure to improve Copilot's competitive position; and that Microsoft had failed to convert a meaningful share of its commercial Office 365 user base to paid Copilot subscriptions.

The lawsuit asserts claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934. Investors have until Aug. 11 to petition the court to serve as lead plaintiff. Similar actions have been filed by Pomerantz LLP and Bronstein, Gewirtz & Grossman LLC on behalf of shareholders.

What's at Stake

The case tests whether AI product claims by major technology companies constitute material statements subject to securities fraud liability. Microsoft's Copilot — embedded across its Office suite, Windows and Azure — represents the company's most significant AI investment, with tens of billions of dollars in related capital spending. If the plaintiffs prevail, the company could face substantial financial penalties and be required to reform its disclosure practices around AI product performance metrics. A dismissal would reaffirm the latitude companies have in marketing emerging technologies whose adoption trajectories are inherently uncertain.

This article is for informational purposes only and does not constitute investment advice.