Duolingo Inc (DUOL) closed at $193.72 on November 6, 2025, down 25.5% from the previous session, marking its largest single-day decline in recent history. This sharp drop far exceeds broader market losses, with the NASDAQ Composite down only 1.19% on the same day. No major news, earnings, or announcements from Duolingo were reported on November 6, 2025, in reputable sources. The sell-off appears to be driven by company-specific factors or a sudden shift in investor sentiment, as the move is not explained by general market trends or sector-wide news.