Microsoft faces securities fraud suit after Copilot issues trigger 10% drop

Microsoft investors filed a securities fraud class action after the company's stock plunged 10% on Jan. 28, wiping out $48.13 per share.

"Microsoft consistently touted Copilot's best-in-class capabilities, which purportedly drove widespread user adoption, but in truth the product suffered from severe functionality issues that caused user adoption to decline," the complaint filed in the U.S. District Court for the Western District of Washington alleges.

The lawsuit covers investors who bought Microsoft securities between May 1, 2025 and Jan. 28, 2026. On Jan. 28, Microsoft reported disappointing fiscal second-quarter results and revealed that Azure growth had slowed suddenly. The company also disclosed that Microsoft 365 Copilot premium customers totaled only 15 million, materially below analyst estimates. Shares fell $48.13, or 10%, to $433.50. A Feb. 3 Wall Street Journal article reported that "confusing brand positioning and interoperability problems have frustrated users."

The complaint alleges Microsoft misled investors about Copilot's functionality and adoption, which put Azure revenue at risk. Investors have until Aug. 11 to seek lead plaintiff status. The case is City of St. Clair Shores Police and Fire Retirement System, et al. v. Microsoft Corp., No. 26-cv-02071.

According to the complaint, Microsoft's Copilot products experienced brand positioning, user experience, capacity, and interoperability problems. The company's proprietary AI model ranked below competitors on benchmark tests. Microsoft needed to increase capital expenditures by billions of dollars and divert GPU and CPU capacity away from Azure to improve Copilot's competitive position, the suit alleges. The company also failed to convert a significant percentage of Microsoft 365 users to paid Copilot subscriptions, losing market share to rivals.

The lawsuit adds legal and reputational risk to Microsoft's AI strategy, which has been central to its growth narrative. Investors will watch for the company's response and any impact on Azure's growth trajectory when Microsoft reports its next quarterly results.

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