Duolingo, Inc. — Director's Dealing 2025

Dec 10, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Duolingo, Inc. (DUOL)
CIK: 0001562088
Period of Report: 2025-12-08

Reporting Person: Hacker Severin (Director, Chief Tech Officer, Co-Founder, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-08	Class A Common Stock	C	50000	—	Acquired	50072	Direct
2025-12-08	Class A Common Stock	G	50000	—	Disposed	72	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-08	Class B Common Stock	$	C	50000	Disposed		Class A Common Stock (50000)	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock (147787)	147787	Direct

Footnotes

F1: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock in connection with: (i) any transfer, whether or not for value, except for certain permitted transfers further described in the Issuer's amended and restated certificate of incorporation, (ii) such time as the aggregate number of shares of Class B Common Stock outstanding ceases to represent 5% of the aggregate number of shares of Common Stock outstanding, and (iii) the death of the Reporting Person.

F2: Shares held by SBH Trust dated March 10, 2020, of which Reporting Person is Trustee.