Duolingo, Inc. (DUOL) made 778 filings in its most recent EDGAR window (2012-11-13 to 2026-10-09) — about 55 routine filings per year once routine debt and shelf offerings are excluded. 453 of the filings are insider forms (Form 4: 432, Form 3: 21, Form 5: 0), i.e. 58.2% of routine filings.
Of the 778 filings in this window, 8 (1.0%) are routine debt or shelf offerings (form 424B*, FWP, S-3*), which are excluded from the routine rate below because large issuers generate them continuously.