** Shares of language learning app Duolingo DUOL.O fall 8.7% to $343 premarket
** Co forecasts 2025 annual core adjusted profit between $259.9 mln and $274 mln, below estimates of $272.1 mln — data compiled by LSEG
** Says forecast is lower than expected because of costs related to AI video call features
** DUOL expects profit margin on sales to be ~3% lower in H1, compared with a year ago
** Co plans to invest heavily in research and development, sales and marketing during H1
** Stock had risen ~15.9% YTD as of Thursday's close, after gaining ~51.3% in 2024
(Reporting by Rishi Kant in Bengaluru)
((Rishi.Kant@thomsonreuters.com))
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