Duolingo: Luis von Ahn lists $16.3M share sale

The prior-sales section names both Luis von Ahn Arellano and the Luis von Ahn Foundation in connection with Rule 10b5-1 sales.

Rhea-AI Filing Summary

Duolingo, Inc. is the issuer in a Rule 144 notice listing 110,046 common shares for sale for Luis von Ahn Arellano’s account, with an aggregate market value of $16,301,113.98. The shares are listed as acquired from the issuer through exercise of stock options on October 7, 2026, with cash payment.

Key Figures

Common shares listed for sale: 110,046 shares Aggregate market value: $16,301,113.98 Shares outstanding: 40,387,012 shares

3 metrics

Common shares listed for sale 110,046 shares For Luis von Ahn Arellano’s account

Aggregate market value $16,301,113.98 Common shares listed for sale

Shares outstanding 40,387,012 shares Duolingo common shares

Key Terms

Rule 144, Rule 10b5-1, Aggregate market value, Exercise of Stock Options

4 terms

Rule 144 regulatory

"144: Issuer Information"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Rule 10b5-1 regulatory

"10b5-1 Sales for LUIS VON AHN ARELLANO"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Aggregate market value financial

"Aggregate market value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Exercise of Stock Options financial

"Exercise of Stock Options"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many DUOL shares are listed for sale for Luis von Ahn Arellano?

The notice lists 110,046 Duolingo common shares for sale for Luis von Ahn Arellano’s account, with an aggregate market value of $16,301,113.98. The approximate sale date is October 7, 2026.

What recent DUOL sales are listed under Rule 10b5-1?

For Luis von Ahn Arellano, the entries list 46,682 shares ($7,031,793.80) on September 24, 2026; 3,614 ($548,996.23) on September 22; 37,366 ($5,624,730.38) on September 21; and 28,292 ($4,250,140.24) on September 16. For the Luis von Ahn Foundation, entries list 34,992 shares ($5,268,280.05) on September 21 and 19,008 ($2,832,624.09) on September 16.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/07/2026 - 04:31 PM Accepted by SEC EDGAR 10/07/2026 - 04:31 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001829259
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Duolingo, Inc.
SEC File Number	001-40653
Address of Issuer	5900 Penn Avenue Pittsburgh PENNSYLVANIA 15206
Phone	4125676602
Name of Person for Whose Account the Securities are To Be Sold	LUIS VON AHN ARELLANO
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director
Relationship to Issuer	Officer
Relationship to Issuer	10% Stockholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	110046	16301113.98	40387012	10/07/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/07/2026	Exercise of Stock Options	Issuer			110046	10/07/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for LUIS VON AHN ARELLANO 5900 Penn Avenue Pittsburgh PA 15206	Common	09/24/2026	46682	7031793.80
10b5-1 Sales for LUIS VON AHN ARELLANO 5900 Penn Avenue Pittsburgh PA 15206	Common	09/22/2026	3614	548996.23
10b5-1 Sales for LUIS VON AHN ARELLANO 5900 Penn Avenue Pittsburgh PA 15206	Common	09/21/2026	37366	5624730.38
10b5-1 Sales for LUIS VON AHN FOUNDATION 5900 Penn Avenue Pittsburgh PA 15206	Common	09/21/2026	34992	5268280.05
10b5-1 Sales for LUIS VON AHN ARELLANO 5900 Penn Avenue Pittsburgh PA 15206	Common	09/16/2026	28292	4250140.24
10b5-1 Sales for LUIS VON AHN FOUNDATION 5900 Penn Avenue Pittsburgh PA 15206	Common	09/16/2026	19008	2832624.09

144: Remarks and Signature

Remarks
Date of Notice	10/07/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Luis Von Ahn Arellano
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)