Lawsuit Alleges Duolingo Misled Investors on User Growth and Business Practices
A class action lawsuit claims Duolingo Inc. misled investors regarding its daily active user (DAU) growth and business strategies, leading to significant stock price declines.
New York, NY – October 15, 2026 – Duolingo, Inc. (NASDAQ: DUOL) is facing a securities class action lawsuit alleging that the company misled investors about its daily active user (DAU) growth and monetization strategies. The lawsuit, filed on behalf of shareholders who purchased Duolingo stock between May 2, 2025, and February 26, 2026, claims investors suffered billions of dollars in losses as the stock price declined significantly.
The complaint, pending in the U.S. District Court for the Western District of Pennsylvania, centers on allegations that Duolingo failed to adequately disclose how its ad-heavy monetization, its "Energy" feature, and AI-generated content were impacting DAU growth. The suit contends that the company downplayed these factors' effects, despite internal A/B tests allegedly showing negative impacts on user engagement and growth.
According to the allegations, Duolingo's management told investors that the AI backlash was not "very material" and that the absence of DAU guidance signaled stability. However, the company is accused of knowing that its own tests indicated that increased friction in the user experience was driving away free learners. The lawsuit points to specific issues, such as unskippable ads and the design of the "Energy" feature, as contributing to user attrition and slower growth.
Shareholders who purchased Duolingo stock during the specified class period are advised to review the details of the lawsuit. The deadline for lead plaintiff appointment is December 7, 2026. SueWallSt, affiliated with Levi & Korsinsky LLP, is handling inquiries for potentially affected investors.