Purchasers of Duolingo, Inc. Class A common stock between May 2, 2025, and February 26, 2026, inclusive, have been reminded of a December 7, 2026, deadline to seek lead plaintiff status in a proposed securities class action. Rosen Law Firm said the lawsuit alleges Duolingo misrepresented the effects of increased advertising, subscription upsells, reduced product quality and rapidly generated artificial-intelligence content on daily active user growth and the user experience. The complaint also alleges that Duolingo’s A/B testing showed increased friction in the free product was hurting user growth, while its monetization strategy and lower-quality AI content weakened subscription value and threatened the sustainability of its financial performance. A lawsuit has been filed, but no class has been certified. Eligible investors may contact Rosen Law Firm through its website, by calling 866-767-3653 or by emailing [email protected]. The firm said investors may participate under a contingency-fee arrangement without out-of-pocket fees or costs, and that serving as lead plaintiff is not required to share in any potential recovery.