Dyne Therapeutics grants Kerr 8,000 stock units

The Head of R&D and CMO's RSUs vest quarterly beginning January 20, 2027, while the option shares vest monthly through October 20, 2030.

Rhea-AI Filing Summary

Dyne Therapeutics, Inc. (DYN) reported that its Head of R&D and CMO, Douglas Kerr, received an award of 8,000 restricted stock units (RSUs) and a stock option covering 12,000 shares on October 20, 2026. Each RSU represents the right to receive one common share upon vesting, and the option has an exercise price of $16.27 per share. Kerr's reported common-stock holdings following the award were 170,564 shares, including 133,126 unvested RSUs.

Insider Trade Summary

Grant/Award: 20,000 shares

Grant/Award 2 txns

Insider Kerr Douglas

Role Head of R&D and CMO

Type	Security	Shares	Price	Value
Grant/Award	Stock option (right to buy) F3	12,000	$0.00	$0.00
Grant/Award	Common Stock F1, F2	8,000	$0.00	$0.00

Holdings After Transaction: Stock option (right to buy) — 12,000 contracts (Direct); Common Stock — 170,564 shares (Direct)

Footnotes (3)

1. F1. Consists of shares of Common Stock issuable under 8,000 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs are scheduled to vest in equal quarterly installments over four years with the first installment vesting on January 20, 2027.
2. F2. Includes 133,126 unvested RSUs.
3. F3. This option was granted on October 20, 2026. The shares underlying the option are scheduled to vest over four years in equal monthly installments through October 20, 2030.

Key Figures

Restricted stock units: 8,000 RSUs Option shares: 12,000 shares Exercise price: $16.27 per share +2 more

5 metrics

Restricted stock units 8,000 RSUs Awarded October 20, 2026; each RSU represents the right to receive one common share upon vesting.

Option shares 12,000 shares Underlying the stock option awarded October 20, 2026.

Exercise price $16.27 per share Stock option awarded October 20, 2026.

Common-stock holdings following award 170,564 shares Reported after the October 20, 2026 award; includes 133,126 unvested RSUs.

Unvested RSUs 133,126 RSUs Included in Douglas Kerr's reported holdings following the award.

Key Terms

restricted stock units (RSUs), vesting, stock option, exercise price

4 terms

restricted stock units (RSUs) financial

"8,000 restricted stock units ("RSUs")"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

vesting financial

"upon vesting"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

stock option financial

"Stock option (right to buy)"

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

exercise price financial

"option's $16.27 exercise price"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

FAQ

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

How do Douglas Kerr's DYN RSUs vest?

The 8,000 RSUs are scheduled to vest in equal quarterly installments over four years, with the first installment vesting on January 20, 2027.

What is the vesting schedule for Douglas Kerr's DYN stock option?

The option shares are scheduled to vest in equal monthly installments over four years, through October 20, 2030.

When does Douglas Kerr's DYN stock option expire?

The stock option expires on October 19, 2036.

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

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Available on EDGAR 10/22/2026 - 04:10 PM EDT Accepted by SEC EDGAR 10/22/2026 - 04:10 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kerr Douglas

(Last) (First) (Middle)

C/O DYNE THERAPEUTICS, INC.

1560 TRAPELO ROAD

(Street)

WALTHAM MASSACHUSETTS 02451

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Dyne Therapeutics, Inc. [ DYN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Head of R&D and CMO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/20/2026		A		8,000(1)	A	$0	170,564(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock option (right to buy)	$16.27	10/20/2026		A		12,000		(3)	10/19/2036	Common Stock	12,000	$0	12,000	D

Explanation of Responses:

1. Consists of shares of Common Stock issuable under 8,000 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs are scheduled to vest in equal quarterly installments over four years with the first installment vesting on January 20, 2027.

2. Includes 133,126 unvested RSUs.

3. This option was granted on October 20, 2026. The shares underlying the option are scheduled to vest over four years in equal monthly installments through October 20, 2030.

	/s/ Ron Caponigro, Attorney-in-Fact	10/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)