William B. Gordon - 08 Sep 2026 Form 4 Insider Report for Duolingo, Inc. (DUOL)

Reporting relationship: Director
Issuer ticker: DUOL
Reported as of: 08 Sep 2026
Net transaction value: -$1,456,736
SEC form: 4
Accepted by SEC: 10 Sep 2026, 16:23:03 UTC
Prior SEC filing: 06 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Stephen Chen, as Attorney-in-Fact for William B. Gordon

Key filing fact

William B. Gordon filed Form 4 for Duolingo, Inc. (DUOL) on 10 Sep 2026.

Key facts

This page summarizes William B. Gordon's Form 4 filing for Duolingo, Inc. (DUOL).
6 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 10 Sep 2026, 16:23.

Change

Previous filing in this sequence was filed on 06 Jul 2026.
Current net transaction value: -$1,456,736.

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 0001229590 Primary reporting owner

GORDON WILLIAM B

Relationship: Director
Address: C/O DUOLINGO, INC., 5900 PENN AVENUE, PITTSBURGH
Signature: /s/ Stephen Chen, as Attorney-in-Fact for William B. Gordon
Signature date: 10 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: $115,068
Shares: -800
Change %: -1%
Price: $143.83
Shares after: 77,615
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1, F2

DUOL transaction

Class A Common Stock

Sale

Transaction value: $396,458
Shares: -2,742
Change %: -3.5%
Price: $144.59
Shares after: 74,873
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1, F3

DUOL transaction

Class A Common Stock

Sale

Transaction value: $508,198
Shares: -3,483
Change %: -4.7%
Price: $145.91
Shares after: 71,390
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1, F4

DUOL transaction

Class A Common Stock

Sale

Transaction value: $392,114
Shares: -2,675
Change %: -3.7%
Price: $146.58
Shares after: 68,715
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1, F5

DUOL transaction

Class A Common Stock

Sale

Transaction value: $29,735
Shares: -200
Change %: -0.29%
Price: $148.68
Shares after: 68,515
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1, F6

DUOL transaction

Class A Common Stock

Sale

Transaction value: $15,164
Shares: -100
Change %: -0.15%
Price: $151.64
Shares after: 68,415
Date: 08 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 6 footnotes

Footnote F1

The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on June 9, 2026.

Footnote F2

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 $143.24 to $144.22, 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 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 $144.25 to $145.21, 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 $145.25 to $146.24, 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 F5

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 $146.25 to $147.16, 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 F6

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 $148.19 to $149.16, 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.