Dyne Therapeutics affiliate files Form 144 to sell stock

Dyne Therapeutics affiliate Erick Lucera filed a Form 144 proposing the sale of restricted and registered common stock.

Rhea-AI Filing Summary

Dyne Therapeutics affiliate Erick Lucera filed a Form 144 proposing the sale of restricted and registered common stock. The filing lists a proposed sale of 5,727 shares with an execution date 04/01/2026 and 1,448 shares with an execution date 05/13/2026. The excerpt also shows 2,362 restricted stock units dated 05/12/2026 tied to equity compensation.

Insights

Corporate Governance Specialist

Routine affiliate sale notice; no material corporate action disclosed.

The Form 144 excerpt reports proposed dispositions by an affiliate, naming Erick Lucera and listing 5,727 shares (04/01/2026) and 1,448 shares (05/13/2026). It also lists 2,362 RSUs dated 05/12/2026, indicating recent equity compensation.

These notices are administrative: the filing permits planned sales under resale rules. The timing, method of sale, and purchaser details are not provided in the excerpt; subsequent Form 4/Form 144 amendments would show execution details.

Key Figures

Proposed sale (example 1): 5,727 shares Proposed sale (example 2): 1,448 shares Restricted Stock Units: 2,362 RSUs +2 more

5 metrics

Proposed sale (example 1) 5,727 shares execution date <date>04/01/2026</date>

Proposed sale (example 2) 1,448 shares execution date <date>05/13/2026</date>

Restricted Stock Units 2,362 RSUs dated <date>05/12/2026</date>

Dollar amount shown (5,727) <money>$106,758.00</money> paired with 5,727 shares in excerpt

Dollar amount shown (1,448) <money>$26,592.00</money> paired with 1,448 shares in excerpt

Key Terms

Form 144, Restricted Stock Units, Equity Compensation

3 terms

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Units compensation

"Common Stock | 05/12/2026 | Restricted Stock Units"

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

"05/12/2026 | 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.

FAQ

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

What does Dyne Therapeutics (DYN) Form 144 filed by Erick Lucera mean?

It notifies the SEC of a proposed affiliate sale of stock. The excerpt lists 5,727 shares (04/01/2026) and 1,448 shares (05/13/2026); sale mechanics are not included.

How many Restricted Stock Units (RSUs) are shown in the Dyne Therapeutics excerpt?

The excerpt shows 2,362 Restricted Stock Units dated 05/12/2026. They are identified as equity compensation in the filing excerpt.

Does the Form 144 excerpt confirm the sales were completed for DYN?

No, the excerpt reports proposed or recent sales but does not confirm execution. Completion details would appear in follow‑up filings or trade records.

Who is the selling party named in the DYN excerpt?

The named affiliate is Erick Lucera, with an address listed in Waltham, MA, associated with the reported share amounts and dates.

Are dollar amounts shown for the securities in the Form 144 excerpt?

Yes; the excerpt pairs share counts with dollar figures such as $106,758.00 (for 5,727 shares) and $26,592.00 (for 1,448 shares) alongside the dates shown.

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

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Accepted by SEC EDGAR 06/25/2026 - 05:11 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	2362	48103.00	165313796	06/25/2026	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	05/12/2026	Restricted Stock Units	Issuer			2362	05/12/2026	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	04/01/2026	5727	106758.00
Erick Lucera 1560 Trapelo Rd Waltham MA 02451	Common Stock	05/13/2026	1448	26592.00

144: Remarks and Signature

Remarks
Date of Notice	06/25/2026
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)