Stephen C. Chen - 14 Sep 2026 Form 4 Insider Report for Duolingo, Inc. (DUOL)

Reporting relationship: General Counsel
Issuer ticker: DUOL
Reported as of: 14 Sep 2026
Net transaction value: -$1,205,385
SEC form: 4
Accepted by SEC: 15 Sep 2026, 18:51:16 UTC
Prior SEC filing: 19 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen C. Chen

Key filing fact

Stephen C. Chen filed Form 4 for Duolingo, Inc. (DUOL) on 15 Sep 2026.

Key facts

This page summarizes Stephen C. Chen's Form 4 filing for Duolingo, Inc. (DUOL).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 15 Sep 2026, 18:51.

Change

Previous filing in this sequence was filed on 19 Aug 2026.
Current net transaction value: -$1,205,385.

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 0001869758 Primary reporting owner

Chen Stephen C.

Relationship: General Counsel
Address: C/O DUOLINGO, INC., 5900 PENN AVENUE, PITTSBURGH
Signature: /s/ Stephen C. Chen
Signature date: 15 Sep 2026

Reported non-derivative transactions

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

DUOL transaction

Class A Common Stock

Sale

Transaction value: $310,635
Shares: -2,107
Change %: -4.1%
Price: $147.43
Shares after: 49,734
Date: 14 Sep 2026
Ownership: Direct
Footnotes: F1

DUOL transaction

Class A Common Stock

Sale

Transaction value: $894,750
Shares: -5,965
Change %: -12%
Price: $150.00
Shares after: 43,769
Date: 14 Sep 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 1 footnote

Footnote F1

The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on June 14, 2026.