Form 4 for Lilly III John Osborne filed 07/14/2026

SEC Form 4

FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

1. Name and Address of Reporting Person
   Issuer Name and Ticker or Trading Symbol
   Relationship of Reporting Person(s) to Issuer

   • Duolingo, Inc. [DUOL]
     • Lilly III John Osborne
       • Director
       • 10% Owner
       • Officer (give title)
       • Other (specify)

2. Date of Earliest Transaction (Month/Day/Year)

   • 07/10/2026
   • C/O DUOLINGO, INC.
     • 5900 PENN AVENUE
     • PITTSBURGH PA 15206

3. If Amendment, Date of Original Filed (Month/Day/Year)

4. Individual or Joint/Group Filing (Check Applicable Line)

   • Form filed by One Reporting Person
   • Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Benefited