Sell4

Duolingo, Inc.

DUOL

Total Value

$5.3M

Net $4.3M sold

Filing Date

Sep 18, 2026

2 transactions

Sales

$4.3M

2 transactions

Trade Summary

On Sep 16, 2026, von Ahn Luis, President & CEO, Co-Founder, Director, 10% Owner, sold $5.3M of Duolingo, Inc. (DUOL) across 2 transactions. The filing covers Class A Common Stock and reflects net selling of $4.3M. Reported prices ranged from $14.42 to $151.54. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

DUOL daily price with the insider's sale marked at $150.22.

Sold in the upper half of the 6-month range · the stock trades 6% lower today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: von Ahn Luis
Role: President & CEO, Co-Founder, Director, 10% Owner
Location: PITTSBURGH, PA

Filing Details

Filing Date: Sep 18, 2026
Transaction Date: Sep 16, 2026
Accession Number: 0001628280-26-062790
Form Type: 4
Net Trading Amount: -$4.3M

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Sep 16, 2026	Class A Common Stock	23,040	$14.42	C	$332.2K
Sep 16, 2026	Class A Common Stock	5,252	$38.08	C	$200.0K
Sep 16, 2026	Class A Common Stock	27,272	$150.17	Sale	$4.1M
Sep 16, 2026	Class A Common Stock	1,020	$151.54	Sale	$154.6K

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Sep 16, 2026	DUOL derivative	23,040	$14.42	Exercise	$332.2K
Sep 16, 2026	DUOL derivative	23,040	—	C	—
Sep 16, 2026	DUOL derivative	23,040	—	C	—
Sep 16, 2026	DUOL derivative	5,252	$38.08	Exercise	$200.0K
Sep 16, 2026	DUOL derivative	5,252	—	C	—
Sep 16, 2026	DUOL derivative	5,252	—	C	—

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Footnotes

(F1)The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on June 2, 2026.
(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 $150.00 to $150.54, 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.
(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 $151.53 to $152.55, 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.
(F4)The shares subject to the option are fully vested and exercisable.
(F5)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.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

von Ahn Luis

(Last)

(First)

(Middle)

C/O DUOLINGO, INC.

5900 PENN AVENUE

(Street)

PITTSBURGH

15206

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
Duolingo, Inc. [ DUOL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO, Co-Founder

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	09/16/2026		C		23,040	A	$14.42	23,040	D
Class A Common Stock	09/16/2026		C		5,252	A	$38.08	28,292	D
Class A Common Stock	09/16/2026		S⁽¹⁾		27,272	D	$150.1749⁽²⁾	1,020	D
Class A Common Stock	09/16/2026		S⁽¹⁾		1,020	D	$151.54⁽³⁾	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$14.42	09/16/2026		M			23,040	⁽⁴⁾	12/12/2029	Class B Common Stock	23,040	$0	27,960	D
Class B Common Stock	⁽⁵⁾	09/16/2026		C		23,040		⁽⁵⁾	⁽⁵⁾	Class A Common Stock	23,040	$0	3,391,160	D
Class B Common Stock	⁽⁵⁾	09/16/2026		C			23,040	⁽⁵⁾	⁽⁵⁾	Class A Common Stock	23,040	$0	3,368,120	D
Stock Option (Right to Buy)	$38.08	09/16/2026		M			5,252	⁽⁴⁾	12/02/2030	Class B Common Stock	5,252	$0	169,748	D
Class B Common Stock	⁽⁵⁾	09/16/2026		C		5,252		⁽⁵⁾	⁽⁵⁾	Class A Common Stock	5,252	$0	3,373,372	D
Class B Common Stock	⁽⁵⁾	09/16/2026		C			5,252	⁽⁵⁾	⁽⁵⁾	Class A Common Stock	5,252	$0	3,368,120	D

Explanation of Responses:

1. The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on June 2, 2026.

2. 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 $150.00 to $150.54, 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.

3. 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 $151.53 to $152.55, 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.

4. The shares subject to the option are fully vested and exercisable.

5. 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.

Remarks:

	/s/ Stephen Chen, as Attorney-in-Fact for Luis von Ahn	09/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Form 4 as rendered by the SEC from accession 0001628280-26-062790.

Duolingo, Inc.

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

Price at the Time of the Trade

SEC Form 4