Duolingo's Luis von Ahn plans $6.81M share sale

The notice also lists five earlier sales labeled 10b5-1 for Arellano and Luis von Ahn Foundation.

Available on EDGAR 09/24/2026 - 04:41 PM EDT Accepted by SEC EDGAR 09/24/2026 - 04:41 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Duolingo, Inc. lists an intended sale for the account of Luis von Ahn Arellano of 46,682 common shares on September 24, 2026, with an aggregate market value of $6,814,638.36. The listed acquisition is an exercise of stock options from the issuer for cash. The past-three-months section lists five sales labeled 10b5-1 for Arellano and Luis von Ahn Foundation.

Key Figures

Common shares listed for sale: 46,682 shares Aggregate market value of shares listed for sale: $6,814,638.36 Shares sold by Luis von Ahn Arellano: 3,614 shares +4 more

7 metrics

Common shares listed for sale 46,682 shares Intended sale date: September 24, 2026

Aggregate market value of shares listed for sale $6,814,638.36 Shares listed for sale on September 24, 2026

Shares sold by Luis von Ahn Arellano 3,614 shares 10b5-1 sale on September 22, 2026

Shares sold by Luis von Ahn Arellano 37,366 shares 10b5-1 sale on September 21, 2026

Shares sold by Luis von Ahn Foundation 34,992 shares 10b5-1 sale on September 21, 2026

Shares sold by Luis von Ahn Arellano 28,292 shares 10b5-1 sale on September 16, 2026

Shares sold by Luis von Ahn Foundation 19,008 shares 10b5-1 sale on September 16, 2026

Key Terms

Rule 144, 10b5-1 Sales, Exercise of Stock Options

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

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.

10b5-1 Sales regulatory

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

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

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 does Luis von Ahn Arellano plan to sell?

The notice lists 46,682 common shares for sale on September 24, 2026, with an aggregate market value of $6,814,638.36. The listed acquisition is an exercise of stock options from the issuer for cash.

What recent DUOL stock sales are listed?

The recent-sales section lists five 10b5-1 sales: Luis von Ahn Arellano sold 3,614 shares on September 22, 2026, 37,366 shares on September 21, 2026, and 28,292 shares on September 16, 2026; Luis von Ahn Foundation sold 34,992 shares on September 21, 2026, and 19,008 shares on September 16, 2026.

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

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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	46682	6814638.36	40387012	09/24/2026	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	09/24/2026	Exercise of Stock Options	Issuer			46682	09/24/2026	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	09/22/2026	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	09/24/2026
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)