DYN holder Doug Kerr plans stock sale

Doug Kerr filed to sell up to 2,443 shares of DYN common stock through Stifel Nicolaus, with an indicated value of $64,203.00, in a transaction dated August 13, 2026 on Nasdaq.

Rhea-AI Filing Summary

Doug Kerr filed to sell up to 2,443 shares of DYN common stock through Stifel Nicolaus, with an indicated value of $64,203.00, in a transaction dated August 13, 2026 on Nasdaq. The filing references equity compensation awards of 5,312 and 3,000 restricted stock units and notes a prior sale of 887 shares for $16,263.00 on June 16, 2026.

Key Figures

Planned shares to be sold: 2,443 shares Planned sale value: $64,203.00 Prior 3‑month sale proceeds: $16,263.00 +3 more

6 metrics

Planned shares to be sold 2,443 shares Common stock to be sold through Stifel Nicolaus dated 08/13/2026

Planned sale value $64,203.00 Aggregate value for 2,443 common shares in planned sale

Prior 3‑month sale proceeds $16,263.00 Sale of 887 common shares on 06/16/2026

Prior 3‑month shares sold 887 shares Common stock sold on 06/16/2026

Restricted stock units (Aug grant) 5,312 units Restricted Stock Units dated 08/12/2026, identified as equity compensation

Restricted stock units (Jun grant) 3,000 units Restricted Stock Units dated 06/05/2026, identified as equity compensation

Key Terms

Restricted Stock Units, Equity Compensation, Nasdaq

3 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

"5312 | 08/13/2026 | Equity Compensation Common Stock"

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.

Nasdaq market

"186746431 | 08/13/2026 | Nasdaq"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

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

What stock transaction did DYN shareholder Doug Kerr disclose in this Form 144?

Doug Kerr indicated an intent to sell up to 2,443 shares of DYN common stock through Stifel Nicolaus, with an aggregate value of $64,203.00, in a transaction dated August 13, 2026 on Nasdaq.

What prior DYN stock sales by Doug Kerr are noted in this filing?

The filing notes that on June 16, 2026, Doug Kerr sold 887 shares of DYN common stock for total proceeds of $16,263.00, reported as securities sold during the past three months.

How many DYN restricted stock units are associated with Doug Kerr in this Form 144?

The disclosure lists equity compensation awards of 5,312 restricted stock units dated August 12, 2026 and 3,000 restricted stock units dated June 5, 2026, both identified as being issued by the issuer.

Which broker and market are involved in Doug Kerr’s planned DYN stock sale?

The planned sale of up to 2,443 shares of DYN common stock is to be executed through Stifel Nicolaus & Company Inc. on the Nasdaq market, with the transaction dated August 13, 2026.

What is the approximate value of Doug Kerr’s planned DYN stock sale?

The filing shows an indicated aggregate value of $64,203.00 for the planned sale of up to 2,443 shares of DYN common stock through Stifel Nicolaus on Nasdaq.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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	0001814189
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	Kerr Douglas
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	2443	64203.00	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			5312	08/13/2026	Equity Compensation
Common Stock	06/05/2026	Restricted Stock Units	Issuer			3000	06/16/2026	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
Doug Kerr 1560 Trapelo Rd Waltham MA 02451	Common Stock	06/16/2026	887	16263.00

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 Doug Kerr
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)