A maker of free, game-like apps that teach dozens of languages — plus math, music, and even chess — through bite-sized lessons, streaks, and rewards. It was founded in 2011 by computer scientist Luis von Ahn and his Ph.D. student Severin Hacker at Carnegie Mellon University, after they noticed millions wanted to learn a language but couldn't afford pricey courses. The name blends the Latin "duo" (two) with "lingo" (language), and its green owl mascot Duo became famous for guilt-tripping users with persistent reminder notifications.
Select a row to see that insider’s individual transactions. † Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last year: -97.8K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.