Natalie Glance - 17 Aug 2026 Form 4 Insider Report for Duolingo, Inc. (DUOL)

Reporting relationship: Chief Engineering Officer
Issuer ticker: DUOL
Reported as of: 17 Aug 2026
Net transaction value: -$567,315
SEC form: 4
Accepted by SEC: 19 Aug 2026, 17:16:18 UTC
Prior SEC filing: 19 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen Chen, as Attorney-in-Fact for Natalie Glance

Key filing fact

Natalie Glance filed Form 4 for Duolingo, Inc. (DUOL) on 19 Aug 2026.

Key facts

This page summarizes Natalie Glance's Form 4 filing for Duolingo, Inc. (DUOL).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 19 Aug 2026, 17:16.

Change

Previous filing in this sequence was filed on 19 May 2026.
Current net transaction value: -$567,315.

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 0001870350 Primary reporting owner

Glance Natalie

Relationship: Chief Engineering Officer
Address: C/O DUOLINGO, INC., 5900 PENN AVENUE, PITTSBURGH
Signature: /s/ Stephen Chen, as Attorney-in-Fact for Natalie Glance
Signature date: 19 Aug 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: $355,237
Shares: -2,751
Change %: -1.6%
Price: $129.13
Shares after: 170,650
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1

DUOL transaction

Class A Common Stock

Sale

Transaction value: $68,779
Shares: -502
Change %: -0.29%
Price: $137.01
Shares after: 170,148
Date: 18 Aug 2026
Ownership: Direct
Footnotes: F2, F3

DUOL transaction

Class A Common Stock

Sale

Transaction value: $143,300
Shares: -1,037
Change %: -0.61%
Price: $138.19
Shares after: 169,111
Date: 18 Aug 2026
Ownership: Direct
Footnotes: F2, F4

DUOL holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 130
Date: 17 Aug 2026
Ownership: By son

^* 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 4 footnotes

Footnote F1

Represents shares automatically sold to satisfy tax withholding obligations in connection with the vesting of restricted stock units and delivery of shares.

Footnote F2

The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on September 15, 2025.

Footnote F3

The price reported in Column 4 is a weighted average sale price calculated by the broker executing the sales. These shares were sold in multiple transactions at prices ranging from $136.68 to $137.61, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Footnote F4

The price reported in Column 4 is a weighted average sale price calculated by the broker executing the sales. These shares were sold in multiple transactions at prices ranging from $137.72 to $138.59, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.