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Duolingo Shareholder Alert: Legal Actions and Deadlines

Investors in Duolingo, Inc. (stock symbol: DUOL) who have incurred substantial financial losses are facing a critical deadline regarding a continuing class action lawsuit. ClaimsFiler, a free service dedicated to informing shareholders, has issued a reminder that affected investors can file lead plaintiff applications until December 7, 2026. This lawsuit targets material omissions made by Duolingo during a specific class period from May 2, 2025, to February 26, 2026.

Understanding the Lawsuit

The legal action, titled City of Dearborn Heights Act 345 Police and Fire Retirement System v. Duolingo, Inc., is currently pending in the United States District Court for the Western District of Pennsylvania. The lawsuit alleges that Duolingo and some of its executives failed to disclose significant information that would impact investor decisions and violate federal securities laws.

According to the lawsuit's claims, the defendants inflicted material damage on the company's user experience. This included:

1. Increased User Friction: Investors were not informed that Duolingo deliberately increased complications in the user experience, primarily through higher ad volumes, aggressive subscription upselling, and deteriorating product quality. This strategy reportedly drove users away, adversely impacting the platform's daily active user (DAU) growth.
2. Hidden Test Results: Internal A/B testing revealed detrimental effects on DAU growth due to the aforementioned friction. However, these insights were concealed from investors, impacting their investment strategy.
3. AI Content Quality Concerns: Rapid development of AI-driven content allegedly degraded Duolingo’s educational offerings, negatively affecting user experience and leading to declining user retention.
4. Eroding Growth Strategy: Despite the claims of benefiting from