Severin Hacker - 08 Dec 2025 Form 4 Insider Report for Duolingo, Inc. (DUOL)

Reporting relationship: Chief Tech Officer, Co-Founder, Director, 10%+ Owner
Issuer ticker: DUOL
Reported as of: 08 Dec 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 09 Dec 2025, 18:41:19 UTC
Prior SEC filing: 03 Dec 2025
Next SEC filing: 20 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen Chen, as Attorney-in-Fact for Severin Hacker

Key filing fact

Severin Hacker filed Form 4 for Duolingo, Inc. (DUOL) on 09 Dec 2025.

Key facts

This page summarizes Severin Hacker's Form 4 filing for Duolingo, Inc. (DUOL).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 09 Dec 2025, 18:41.

Change

Previous filing in this sequence was filed on 03 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001870272 Primary reporting owner

Hacker Severin

Relationship: Chief Tech Officer, Co-Founder, Director, 10%+ Owner
Address: C/O DUOLINGO, INC., 5900 PENN AVENUE, PITTSBURGH
Signature: /s/ Stephen Chen, as Attorney-in-Fact for Severin Hacker
Signature date: 09 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DUOL transaction

Class A Common Stock

Conversion of derivative security

Transaction value: $0
Shares: +50,000
Change %: +69444%
Price: $0.000000
Shares after: 50,072
Date: 08 Dec 2025
Ownership: Direct

DUOL transaction

Class A Common Stock

Gift

Transaction value: $0
Shares: -50,000
Change %: -100%
Price: $0.000000
Shares after: 72
Date: 08 Dec 2025
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DUOL transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value: $0
Shares: -50,000
Change %: -1.7%
Price: $0.000000
Shares after: 2,836,917
Date: 08 Dec 2025
Ownership: See footnote
Underlying class: Class A Common Stock
Underlying amount: 50,000
Exercise price
Footnotes: F1, F2

DUOL holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 147,787
Date: 08 Dec 2025
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 147,787
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote 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.

Footnote F2

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