Duolingo holder plans $540K stock sale

Luis Von Ahn Arellano filed a Rule 144 notice to sell up to 3,614 Duolingo shares tied to an option exercise, following prior 10b5-1 plan sales.

Rhea-AI Filing Summary

Duolingo, Inc. (DUOL) received a Rule 144 notice that Luis Von Ahn Arellano plans to sell up to 3,614 shares of Duolingo common stock, expected around September 22, 2026, through Morgan Stanley Smith Barney, in connection with an exercise of stock options for cash.

The notice also lists prior Rule 10b5-1 plan sales over the past three months by Luis Von Ahn Arellano and the Luis Von Ahn Foundation.

Key Figures

Proposed shares to be sold: 3,614 shares Aggregate market value of proposed sale: $540,003.88 Recent 10b5-1 sale by Luis Von Ahn Arellano on September 21, 2026: 37,366 shares for $5,624,730.38 +3 more

6 metrics

Proposed shares to be sold 3,614 shares Common stock under Rule 144 notice expected around September 22, 2026

Aggregate market value of proposed sale $540,003.88 Market value associated with 3,614 shares of Duolingo common stock

Recent 10b5-1 sale by Luis Von Ahn Arellano on September 21, 2026 37,366 shares for $5,624,730.38 Common stock sold under a 10b5-1 plan

Recent 10b5-1 sale by Luis Von Ahn Arellano on September 16, 2026 28,292 shares for $4,250,140.24 Common stock sold under a 10b5-1 plan

Recent 10b5-1 sale by Luis Von Ahn Foundation on September 21, 2026 34,992 shares for $5,268,280.05 Common stock sold by Luis Von Ahn Foundation

Recent 10b5-1 sale by Luis Von Ahn Foundation on September 16, 2026 19,008 shares for $2,832,624.09 Common stock sold by Luis Von Ahn Foundation

Key Terms

Rule 144, 10b5-1, 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 regulatory

"10b5-1 Sales for LUIS VON AHN ARELLANO 5900 Penn Avenue Pittsburgh PA"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 09/22/2026 | Exercise of Stock Options | Issuer"

FAQ

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

What does the Form 144 filing mean for Duolingo, Inc. (DUOL)?

The filing states that Luis Von Ahn Arellano has given notice under Rule 144 of his intention to sell up to 3,614 shares of Duolingo common stock in connection with an exercise of stock options for cash around September 22, 2026.

How many Duolingo (DUOL) shares are proposed to be sold in this Rule 144 notice?

The notice covers a proposed sale of up to 3,614 shares of Duolingo common stock, with an aggregate market value indicated as $540,003.88 and trading on the NASDAQ market.

What is the source of the Duolingo (DUOL) shares to be sold?

The filing states the 3,614 shares of Duolingo common stock are to be sold on or about September 22, 2026 and are tied to an Exercise of Stock Options, with consideration listed as cash.

Were there recent Duolingo (DUOL) share sales by Luis Von Ahn Arellano?

Yes. The filing lists 10b5-1 sales for Luis Von Ahn Arellano of 37,366 shares on September 21, 2026 for $5,624,730.38 and 28,292 shares on September 16, 2026 for $4,250,140.24.

What Duolingo (DUOL) sales are reported for the Luis Von Ahn Foundation?

The filing lists 10b5-1 sales for the Luis Von Ahn Foundation of 34,992 shares on September 21, 2026 for $5,268,280.05 and 19,008 shares on September 16, 2026 for $2,832,624.09.

Through which broker are the proposed Duolingo (DUOL) shares to be sold?

The proposed sale of 3,614 shares of Duolingo common stock is listed as being through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, NY.

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

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Available on EDGAR 09/22/2026 - 04:15 PM Accepted by SEC EDGAR 09/22/2026 - 04:14 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	3614	540003.88	40387012	09/22/2026	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	09/22/2026	Exercise of Stock Options	Issuer			3614	09/22/2026	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	09/21/2026	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	09/22/2026
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)