X0202 SCHEDULE 13G/A 0001829259-24-000003 0001829259 XXXXXXXX LIVE 3 Class A common stock, $0.0001 per share 06/30/2026 0001562088 Duolingo, Inc. 26603R106 5900 Penn Avenue Pittsburgh PA 15206 Rule 13d-1(d) Von Ahn Luis X1 3594120.00 0.00 3594120.00 0.00 3594120.00 N 8.2 IN Duolingo, Inc. 5900 Penn Avenue, Pittsburgh, Pennsylvania, 15206 This statement is filed on behalf of Luis von Ahn (the "Reporting Person"). The business address of the Reporting Person is c/o Duolingo, Inc., 5900 Penn Avenue, Pittsburgh, PA 15206. United States Y The information contained on the cover page to this Schedule 13G is incorporated by reference into this Item 4. The ownership information presented below represents beneficial ownership of Class A Common Stock of the Issuer as of June 30, 2026, based upon 40,387,012 shares of Class A Common Stock outstanding as of August 4, 2026, based on the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 6, 2026. The Reporting Person is the beneficial owner of 3,594,120 shares of Class A Common Stock, which includes (i) 3,368,120 shares of Class A Common Stock underlying shares of Class B Common Stock held of record by the Reporting Person that are convertible at any time at the option of the holder into Class A Common Stock on a one-for-one basis, and (iii) 226,000 shares of Class A Common Stock underlying stock options held of record by the Reporting Person that are exercisable within 60 days of June 30, 2026. 8.2 3594120 0 3594120 0 Y N Y Y Y Y Y Von Ahn Luis /s/ Luis von Ahn Luis von Ahn, CEO 08/12/2026