DUOL: von Ahn Luis discloses securities transactions

By AlphaYouPublished Sep 19, 2026Form 4

Stocks in this disclosure

Reported activity

von Ahn Luis

Reporting filer

von Ahn Luis reported Conversion in Duolingo, Inc.: 23040 units of Class A Common Stock, dated 2026-09-16. The full Form 4 contains 10 transaction entries.

Disclosed: Sep 19, 2026

Reported details

10 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Class A Common Stock	von Ahn Luis	2026-09-16	C	Conversion	23040	14.42	23,040	3 days	Filed terms security Title: Class A Common Stock transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 23040 transaction Price Per Share: 14.42 transaction Acquired Disposed Code: A shares Owned Following Transaction: 23040 direct Or Indirect Ownership: D
Class A Common Stock	von Ahn Luis	2026-09-16	C	Conversion	5252	38.08	28,292	3 days	Filed terms security Title: Class A Common Stock transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 5252 transaction Price Per Share: 38.08 transaction Acquired Disposed Code: A shares Owned Following Transaction: 28292 direct Or Indirect Ownership: D
Class A Common Stock	von Ahn Luis	2026-09-16	S	Sale	27272	150.1749	1,020	3 days	Filed terms security Title: Class A Common Stock transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 27272 transaction Price Per Share: 150.1749 id: F2 transaction Acquired Disposed Code: D shares Owned Following Transaction: 1020 direct Or Indirect Ownership: D
Class A Common Stock	von Ahn Luis	2026-09-16	S	Sale	1020	151.54	0	3 days	Filed terms security Title: Class A Common Stock transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 1020 transaction Price Per Share: 151.54 id: F3 transaction Acquired Disposed Code: D shares Owned Following Transaction: 0 direct Or Indirect Ownership: D
Stock Option (Right to Buy) (derivative)	von Ahn Luis	2026-09-16	M	Exercise or conversion	23040	0	27,960	3 days	Filed terms security Title: Stock Option (Right to Buy) conversion Or Exercise Price: 14.42 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Shares: 23040 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F4 expiration Date: 2029-12-12 underlying Security Title: Class B Common Stock underlying Security Shares: 23040 shares Owned Following Transaction: 27960 direct Or Indirect Ownership: D
Class B Common Stock (derivative)	von Ahn Luis	2026-09-16	C	Conversion	23040	0	3,391,160	3 days	Filed terms security Title: Class B Common Stock id: F5 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 23040 transaction Price Per Share: 0 transaction Acquired Disposed Code: A id: F5 id: F5 underlying Security Title: Class A Common Stock underlying Security Shares: 23040 shares Owned Following Transaction: 3391160 direct Or Indirect Ownership: D
Class B Common Stock (derivative)	von Ahn Luis	2026-09-16	C	Conversion	23040	0	3,368,120	3 days	Filed terms security Title: Class B Common Stock id: F5 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 23040 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Class A Common Stock underlying Security Shares: 23040 shares Owned Following Transaction: 3368120 direct Or Indirect Ownership: D
Stock Option (Right to Buy) (derivative)	von Ahn Luis	2026-09-16	M	Exercise or conversion	5252	0	169,748	3 days	Filed terms security Title: Stock Option (Right to Buy) conversion Or Exercise Price: 38.08 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Shares: 5252 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F4 expiration Date: 2030-12-02 underlying Security Title: Class B Common Stock underlying Security Shares: 5252 shares Owned Following Transaction: 169748 direct Or Indirect Ownership: D
Class B Common Stock (derivative)	von Ahn Luis	2026-09-16	C	Conversion	5252	0	3,373,372	3 days	Filed terms security Title: Class B Common Stock id: F5 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 5252 transaction Price Per Share: 0 transaction Acquired Disposed Code: A id: F5 id: F5 underlying Security Title: Class A Common Stock underlying Security Shares: 5252 shares Owned Following Transaction: 3373372 direct Or Indirect Ownership: D
Class B Common Stock (derivative)	von Ahn Luis	2026-09-16	C	Conversion	5252	0	3,368,120	3 days	Filed terms security Title: Class B Common Stock id: F5 transaction Date: 2026-09-16 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 5252 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Class A Common Stock underlying Security Shares: 5252 shares Owned Following Transaction: 3368120 direct Or Indirect Ownership: D

Class A Common Stock

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 23040
Price: 14.42
Following holdings: 23,040
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 14.42
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 23040
direct Or Indirect Ownership: D

Class A Common Stock

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 5252
Price: 38.08
Following holdings: 28,292
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 38.08
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 28292
direct Or Indirect Ownership: D

Class A Common Stock

Owner: von Ahn Luis
Date: 2026-09-16
Code: S
Action: Sale
Quantity: 27272
Price: 150.1749
Following holdings: 1,020
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 27272
transaction Price Per Share: 150.1749
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 1020
direct Or Indirect Ownership: D

Class A Common Stock

Owner: von Ahn Luis
Date: 2026-09-16
Code: S
Action: Sale
Quantity: 1020
Price: 151.54
Following holdings: 0
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 1020
transaction Price Per Share: 151.54
id: F3
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Stock Option (Right to Buy) (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: M
Action: Exercise or conversion
Quantity: 23040
Price: 0
Following holdings: 27,960
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 14.42
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F4
expiration Date: 2029-12-12
underlying Security Title: Class B Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 27960
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 23040
Price: 0
Following holdings: 3,391,160
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 3391160
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 23040
Price: 0
Following holdings: 3,368,120
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 3368120
direct Or Indirect Ownership: D

Stock Option (Right to Buy) (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: M
Action: Exercise or conversion
Quantity: 5252
Price: 0
Following holdings: 169,748
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 38.08
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F4
expiration Date: 2030-12-02
underlying Security Title: Class B Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 169748
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 5252
Price: 0
Following holdings: 3,373,372
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 3373372
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

Owner: von Ahn Luis
Date: 2026-09-16
Code: C
Action: Conversion
Quantity: 5252
Price: 0
Following holdings: 3,368,120
Reporting delay: 3 days
Filed terms and references: Filed terms
security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 3368120
direct Or Indirect Ownership: D

Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.
von Ahn Luis: President & CEO, Co-Founder, Director, 10% owner.
The filing reports a Rule 10b5-1 trading plan.
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.

Original sources

SEC ownership filing

Prepared automatically from public filing data. Report a correction.

Security

Owner

Date

Code

Action

Quantity

Price

Following holdings

Reporting delay

Filed terms and references

Class A Common Stock

von Ahn Luis

2026-09-16

Conversion

23040

14.42

23,040

3 days

Filed terms

security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 14.42
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 23040
direct Or Indirect Ownership: D

Class A Common Stock

von Ahn Luis

2026-09-16

Conversion

5252

38.08

28,292

3 days

Filed terms

security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 38.08
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 28292
direct Or Indirect Ownership: D

Class A Common Stock

von Ahn Luis

2026-09-16

Sale

27272

150.1749

1,020

3 days

Filed terms

security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 27272
transaction Price Per Share: 150.1749
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 1020
direct Or Indirect Ownership: D

Class A Common Stock

von Ahn Luis

2026-09-16

Sale

1020

151.54

3 days

Filed terms

security Title: Class A Common Stock
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 1020
transaction Price Per Share: 151.54
id: F3
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Stock Option (Right to Buy) (derivative)

von Ahn Luis

2026-09-16

Exercise or conversion

23040

27,960

3 days

Filed terms

security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 14.42
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F4
expiration Date: 2029-12-12
underlying Security Title: Class B Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 27960
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

von Ahn Luis

2026-09-16

Conversion

23040

3,391,160

3 days

Filed terms

security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 3391160
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

von Ahn Luis

2026-09-16

Conversion

23040

3,368,120

3 days

Filed terms

security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 23040
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 23040
shares Owned Following Transaction: 3368120
direct Or Indirect Ownership: D

Stock Option (Right to Buy) (derivative)

von Ahn Luis

2026-09-16

Exercise or conversion

5252

169,748

3 days

Filed terms

security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 38.08
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F4
expiration Date: 2030-12-02
underlying Security Title: Class B Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 169748
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

von Ahn Luis

2026-09-16

Conversion

5252

3,373,372

3 days

Filed terms

security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 3373372
direct Or Indirect Ownership: D

Class B Common Stock (derivative)

von Ahn Luis

2026-09-16

Conversion

5252

3,368,120

3 days

Filed terms

security Title: Class B Common Stock
id: F5
transaction Date: 2026-09-16
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 5252
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Class A Common Stock
underlying Security Shares: 5252
shares Owned Following Transaction: 3368120
direct Or Indirect Ownership: D

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.

von Ahn Luis: President & CEO, Co-Founder, Director, 10% owner.

The filing reports a Rule 10b5-1 trading plan.

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.