Duolingo is trading at $140.25, down 5.07% after-hours amid investor attention to renewed notices publicizing its securities class action. - October 12 investor-law-firm notices publicized an already-filed complaint alleging misleading statements about user growth, product quality, advertising and subscription upsells; these are allegations, not findings. - A market update linked pressure to investors weighing the notices, but this does not independently establish the move’s cause. The regular-session close was $147.74; broad indexes were mixed, none moving more than 0.5% in the same direction.