Duolingo stock is falling off a cliff, continuing a dramatic collapse. You can’t just blame that ‘AI first’ memo

It’s a horrible day for investors in Duolingo. Shares of the language learning app with the green owl mascot are falling off a cliff after the company reported its fourth quarter results.

Yet it’s not the results themselves that are causing investors to dump the stock. Rather, it’s more about forward guidance the company has issued. Here’s what you need to know.

Duolingo’s Q4 by the numbers

Yesterday, after market close, Duolingo (Nasdaq: DUOL) reported its fourth quarter 2025 results.