Form 4 Filing for Duolingo, Inc. - Hacker Severin

This filing details transactions made by Hacker Severin, Chief Technology Officer, Co-Founder, Director, and 10% owner of Duolingo, Inc. On May 27, 2026, Mr. Hacker acquired 60,000 Performance-Based Restricted Stock Units (PSUs) convertible into Class B Common Stock, vesting based on service and stock price performance. He also acquired 60,000 shares of Class B Common Stock and disposed of 31,920 shares of Class B Common Stock at a price of $107.82 per share. Following these transactions, he holds 210,000 PSUs and 205,273 shares of Class B Common Stock. Additionally, Mr. Hacker holds 72 shares of Class A Common Stock directly. The PSUs and Class B Common Stock have specific conversion and settlement conditions outlined in the footnotes, including conversion to Class A Common Stock under various circumstances such as transfer, volume thresholds, or death.