Rosen Law says Microsoft investors face Aug. 11 deadline in Copilot suit

By Atlas Watchline Staff · Legal · August 9, 2026

Rosen Law Firm said it has filed a securities class action against Microsoft and is urging some investors to seek lead-plaintiff status by Aug. 11, 2026.

Rosen Law Firm said it has filed a securities class action against Microsoft and is urging some investors to seek lead-plaintiff status by Aug. 11, 2026.

Rosen Law Firm said on Aug. 9, 2026, that it filed a securities class action against Microsoft Corporation over alleged false or misleading statements tied to Copilot and related AI products. The notice says investors who bought Microsoft common stock between May 1, 2025, and Jan. 28, 2026, may be eligible for compensation and that anyone seeking to serve as lead plaintiff must move the court by Aug. 11, 2026.

The notice says a lead plaintiff helps direct the litigation on behalf of other class members. Rosen said the case concerns Microsoft's disclosures about Copilot's performance and adoption, as well as the costs and operational demands of its AI push.

According to the notice, the lawsuit alleges that Microsoft made false and/or misleading statements or failed to disclose problems with Copilot products, including brand positioning, user experience, usage, data siloing, computational capacity, organizational issues and interoperability problems. The notice also alleges Microsoft's flagship proprietary AI model ranked below competitors on some benchmark tests.

It further alleges Microsoft needed to increase capital expenditures by billions of dollars and redirect GPU and CPU capacity away from Azure to improve Copilot and expand AI research and development. The notice says the company also failed to convert a significant percentage of Microsoft 365 commercial users to paid Copilot subscriptions and that Copilot offerings lost market share to rivals.

Rosen said investors suffered damages when the alleged true details entered the market. The notice describes the case as a contingency-fee matter with no out-of-pocket fees or costs for eligible investors.

The firm also used the release to describe its securities-litigation practice. It said it concentrates on securities class actions and shareholder derivative litigation, has recovered billions of dollars for investors and has been ranked among the top firms in securities class-action settlements by ISS Securities Class Action Services.

The notice says the class action has already been filed, but it does not describe Microsoft's response. It says investors who want to be considered for lead plaintiff status must act by the Aug. 11 deadline.

Sources

• PR Newswire release from Rosen Law Firm

Editorial note: This article was prepared with AI assistance and includes source attribution for reader review.

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