DYN insider plans sale of 1,797 common shares

DYN reports a planned sale of 1,797 shares of common stock, with an indicated aggregate market value of $47,226.00, to be executed on or after August 13, 2026 on Nasdaq.

Rhea-AI Filing Summary

DYN reports a planned sale of 1,797 shares of common stock, with an indicated aggregate market value of $47,226.00, to be executed on or after August 13, 2026 on Nasdaq. The shares relate to equity compensation, including 4,062 shares tied to restricted stock units dated August 12, 2026.

The filing also lists prior activity over the past three months: on June 25, 2026, Erick Lucera is shown as having sold 2,362 shares of common stock for proceeds of $48,103.00. The notice provides advance disclosure of these intended and recent transactions.

Key Figures

Planned shares to be sold: 1,797 shares Aggregate market value of planned sale: $47,226.00 RSU-related shares: 4,062 shares +2 more

5 metrics

Planned shares to be sold 1,797 shares Common stock to be sold on or after August 13, 2026

Aggregate market value of planned sale $47,226.00 Value associated with 1,797 shares of common stock

RSU-related shares 4,062 shares Common stock linked to restricted stock units dated August 12, 2026

Prior shares sold 2,362 shares Common stock sale on June 25, 2026 by Erick Lucera

Proceeds from prior sale $48,103.00 Total for 2,362 shares sold on June 25, 2026

Key Terms

Restricted Stock Units, Equity Compensation, Securities To Be Sold, Securities Sold During The Past 3 Months

4 terms

Restricted Stock Units financial

"Common Stock | 08/12/2026 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Equity Compensation financial

"4062 | 08/13/2026 | Equity Compensation"

Equity compensation is pay given to employees, executives or contractors in the form of company ownership—such as stock, stock options or restricted shares—rather than just cash. It matters to investors because it can align workers' incentives with shareholders (like paying someone in slices of the same pie they help grow), but it also increases the number of shares outstanding and company expenses, affecting ownership percentages and earnings per share.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What stock sale is disclosed for DYN in this Form 144 notice?

The notice discloses a planned sale of 1,797 shares of DYN common stock with an aggregate market value of $47,226.00, expected to be sold on or after August 13, 2026 on Nasdaq.

How many DYN shares are tied to restricted stock units in this filing?

The filing references 4,062 shares of DYN common stock associated with restricted stock units dated August 12, 2026, categorized under equity compensation in the securities information section.

What prior DYN stock sale is reported for the past 3 months?

For the prior three months, the filing shows that on June 25, 2026 Erick Lucera sold 2,362 shares of DYN common stock for total proceeds of $48,103.00, listed under securities sold during the past 3 months.

On which market are the DYN shares in this Form 144 expected to trade?

The shares covered by this notice are indicated for trading on Nasdaq, with a planned sale date of August 13, 2026, as shown in the securities information section of the filing.

Who is named in connection with DYN share sales in this Form 144?

The section detailing securities sold during the past 3 months lists Erick Lucera, associated with a sale of 2,362 shares of DYN common stock on June 25, 2026 for $48,103.00.

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

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Accepted by SEC EDGAR 08/13/2026 - 05:03 PM EDT 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	0001697616
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	Dyne Therapeutics, Inc.
SEC File Number	001-39509
Address of Issuer	1560 TRAPELO ROAD WALTHAM MASSACHUSETTS 02451
Phone	(781) 786-8230
Name of Person for Whose Account the Securities are To Be Sold	Lucera Erick
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	Officer

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 Stock	Stifel Nicolaus & Company Inc 501 N Broadway St. Louis MO 63102	1797	47226.00	186746431	08/13/2026	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 Stock	08/12/2026	Restricted Stock Units	Issuer			4062	08/13/2026	Equity Compensation

* 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
Erick Lucera 1560 Trapelo Rd Waltham MA 02451	Common Stock	06/25/2026	2362	48103.00

144: Remarks and Signature

Remarks
Date of Notice	08/13/2026
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/ James Weimer, as a duly authorized representative of STIFEL, as attorney-in-fact for Erick Lucera
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)