A securities fraud class action filed on June 12, 2026 accuses Microsoft of misleading investors about how well its Copilot AI product was actually performing, how many customers were paying for it, and what it was costing the company — allegations tied to a roughly 30% decline in Microsoft’s share price over two months. The Microsoft Copilot securities fraud lawsuit, captioned City of St. Clair Shores Police and Fire Retirement System v. Microsoft Corporation, was filed in the U.S. District Court for the Western District of Washington and assigned to Judge S. Kate Vaughan.1CourtListener. City of St. Clair Shores Police and Fire Retirement System v. Microsoft Along with the company, it names CEO Satya Nadella, CFO Amy Hood, Chief Marketing Officer for AI at Work Jared Spataro, and EVP of Experiences and Devices Rajesh Jha as defendants.2Levi & Korsinsky. Microsoft Corporation Class Action Lawsuit The class period runs from May 1, 2025 through January 28, 2026.
What the Complaint Alleges Microsoft Hid
The suit brings claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5, and it groups the alleged misstatements into a few concrete categories.3D&O Diary. Microsoft Hit With AI-Related Securities Suit
On the product itself, plaintiffs allege that Microsoft’s flagship proprietary AI model ranked below competitors on benchmark tests and that the Copilot family suffered from confusing brand positioning, data siloing, and interoperability failures that the company did not disclose to investors.3D&O Diary. Microsoft Hit With AI-Related Securities Suit
On adoption, the complaint highlights that of more than 450 million commercial Microsoft 365 subscribers, only 15 million had paid Copilot subscriptions, a conversion rate of roughly 3.3%. Plaintiffs allege this figure was “materially below analyst estimates” and that Microsoft knew Copilot was losing share to Google’s Gemini and Anthropic’s Claude.3D&O Diary. Microsoft Hit With AI-Related Securities Suit
On costs, the complaint alleges Microsoft failed to disclose that it was diverting billions of dollars’ worth of GPU and CPU capacity away from its profitable Azure cloud business to prop up Copilot, and that this diversion was a key reason Azure growth slowed.2Levi & Korsinsky. Microsoft Corporation Class Action Lawsuit Plaintiffs characterize the overall pattern as “AI washing”: overstating Copilot’s success while concealing its difficulties.3D&O Diary. Microsoft Hit With AI-Related Securities Suit
The Stock Drop the Case Is Built On
The complaint anchors its damages theory to Microsoft’s fiscal second-quarter earnings release on January 28, 2026. The headline numbers looked strong: $81.3 billion in revenue and 39% Azure growth.4Microsoft. Microsoft Cloud and AI Strength Drives Second Quarter Results Beneath them, capital expenditures for the quarter hit $37.5 billion, up 66% year-over-year, with first-half spending of $72.4 billion putting Microsoft on pace for roughly $100 billion in annual infrastructure spending.5Investing.com. Is Microsoft Stock Vulnerable to Rising Capex Pressure From AI Spending On the same call, Microsoft disclosed the 15-million paid Copilot seat figure, a number that disappointed analysts given the size of the installed base.6Directions on Microsoft. Microsoft Claims 15 Million Paid M365 Copilot Seats
The day after the release, shares fell $48.13, roughly 10%, to close at $433.50. The slide continued as more reporting surfaced on Copilot’s functional problems. By March 20, 2026, the stock was around $380, a 30% drop from the class period high.2Levi & Korsinsky. Microsoft Corporation Class Action Lawsuit The first quarter of 2026 was Microsoft’s worst quarterly stock performance since the 2008 financial crisis, with a 23% decline against a 7% drop for the Nasdaq.7CNBC. Microsoft Stock Closes Worst Quarter Since 2008 Financial Crisis As of mid-June 2026, shares were trading at approximately $377.8Public.com. MSFT Forecast Price Target
Who Can Participate and the August 11 Deadline
Any investor who bought Microsoft common stock between May 1, 2025 and January 28, 2026 is a potential class member. You do not have to still own the shares to participate; you only need to have purchased them during the class period.
The deadline to move the court for appointment as lead plaintiff is August 11, 2026.9Morningstar. MSFT Breaking News: Microsoft Corporation Sued for Securities Fraud Under the Private Securities Litigation Reform Act, the court then selects the investor with the largest financial interest in the case to serve as lead plaintiff and help direct the litigation.10Cornell Law Institute. 15 U.S. Code § 78u-4 Moving for lead plaintiff status is optional. Class members who do nothing remain part of the case and share in any eventual recovery if the class is certified and the case succeeds or settles; they simply won’t be steering it.
These cases are litigated on a contingent-fee basis, so class members typically pay nothing unless there is a recovery. The named plaintiff here, the City of St. Clair Shores Police and Fire Retirement System, is a Michigan municipal pension fund — the type of institutional investor that often takes the lead role in securities class actions. The complaint was filed by Bleichmar Fonti & Auld LLP.3D&O Diary. Microsoft Hit With AI-Related Securities Suit
Where the Case Stands and What Comes Next
The case is at its earliest stage. As of mid-June 2026, the docket reflects only the initial complaint, a corporate disclosure statement, and issuance of summons to the named defendants.1CourtListener. City of St. Clair Shores Police and Fire Retirement System v. Microsoft Microsoft has not yet responded.
The typical next move is a motion to dismiss. Under federal law, discovery is automatically stayed while that motion is pending. To survive it, plaintiffs must adequately plead a material misstatement or omission, scienter (an intent to deceive), and loss causation — meaning the stock price fell specifically because the truth came out through a “corrective disclosure.”11American Bar Association. Section 10(b) Litigation: The Current Landscape Plaintiffs point to the January 28, 2026 earnings release and the reporting that followed as that corrective event.
Survival past the dismissal stage is not automatic. Cooley LLP data on AI-related securities cases from 2023 filings shows a 57% dismissal rate, and courts have been growing more comfortable with the doctrines involved.12Cooley LLP. Securities Class Action Trends in 2025: Fewer Cases Filed but More Dollars at Stake If the case does survive, it would move into discovery and class certification, a process that in securities litigation typically takes two to three years from filing, and most cases that get past dismissal settle before trial.11American Bar Association. Section 10(b) Litigation: The Current Landscape The median securities class action settlement in 2025 was $17 million, the highest since 2016.
Part of a Broader AI-Washing Wave
The Microsoft case fits an increasingly familiar pattern. There were 16 AI-related securities class actions in 2025, accounting for only 8% of total securities case filings but 57% of the maximum dollar losses at stake, a reflection of the market capitalizations involved.12Cooley LLP. Securities Class Action Trends in 2025: Fewer Cases Filed but More Dollars at Stake
Recent AI-related shareholder cases include AppLovin Corporation, sued in early 2025 over allegations that revenue attributed to its “AXON 2.0” AI platform actually came from manipulative installation practices; Apple, which faces ongoing securities litigation over the readiness of AI-powered Siri features for the iPhone 16 and separately paid $250 million in 2026 to settle a consumer false-advertising class action on the same subject; and Skyworks Solutions, sued over alleged overstatements about its ability to capitalize on an AI-driven smartphone upgrade cycle.13D&O Diary. Two Companies Hit With Separate AI-Washing Securities Lawsuits14The Next Web. Apple 250M Siri Settlement Landsheft Class Action
Regulators have moved in parallel. The SEC settled with Presto Automation in January 2025 over misrepresentations about its AI-powered restaurant technology and brought civil and criminal charges against the former CEO of Nate, Inc. for claiming an app used AI when transactions were actually processed by human workers. The SEC’s Division of Examinations identified AI as a top focus area for fiscal year 2026.15Levi & Korsinsky. The SEC, AI Disclosures, and a New Wave of Securities Litigation The Microsoft complaint arrives against that backdrop.