Dyne Therapeutics director files initial Form 3

Dyne Therapeutics, Inc. director Barry E. Greene filed an initial Form 3 ownership report.

Rhea-AI Filing Summary

Dyne Therapeutics, Inc. director Barry E. Greene filed an initial Form 3 ownership report. This filing identifies him as a director of the company and, in the data provided, shows no reported transactions or derivative positions, with all buy, sell, and exercise counts at zero.

Key Figures

Buy transactions: 0 Sell transactions: 0 Net buy/sell shares: 0 +2 more

5 metrics

Buy transactions 0 BuyCount in Form 3 data

Sell transactions 0 SellCount in Form 3 data

Net buy/sell shares 0 netBuySellShares in Form 3

Derivative transactions 0 derivativeTransactionCount in Form 3

Holding entries 0 holdingEntries in Form 3 data

Key Terms

Form 3, reporting person, derivative securities

3 terms

Form 3 regulatory

"Initial statement of beneficial ownership on Form 3 for a director."

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reporting person regulatory

"Barry E. Greene is identified as a reporting person and director."

derivative securities financial

"The derivativeSummary section shows no derivative securities reported."

Financial contracts whose value is tied to the price or performance of another asset, such as a stock, bond, commodity, index, or currency; examples include options, futures and swaps. They matter to investors because they let you protect against price swings, bet on future moves or gain larger exposure with less upfront cash—like using a lever or insurance policy on an investment—so they can amplify gains and losses and help manage portfolio risk.

FAQ

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

What does the Dyne Therapeutics (DYN) Form 3 for Barry E. Greene show?

The Form 3 for Dyne Therapeutics director Barry E. Greene records his status as a reporting person. The provided data show zero transactions, zero derivative positions, and a neutral net share change, serving as an initial ownership disclosure.

Does the DYN Form 3 for Barry E. Greene report any share purchases or sales?

No, the data show no share purchases or sales. BuyCount, sellCount, and netBuySellShares are all zero, indicating no reported trading activity in this Form 3 excerpt for Barry E. Greene.

Are there any derivative securities disclosed for Barry E. Greene in Dyne Therapeutics’ Form 3?

No derivative securities are listed in the provided data. The derivativeSummary is empty and derivativeTransactionCount is zero, indicating no options, warrants, or similar instruments are reported in this Form 3 excerpt.

What is the net buy/sell direction in the Dyne Therapeutics (DYN) Form 3 data?

The net buy/sell direction is labeled neutral with netBuySellShares at zero. This means the provided Form 3 data show no net increase or decrease in reported share ownership from transactions.

What role does Barry E. Greene hold at Dyne Therapeutics according to the Form 3?

Barry E. Greene is identified as a director of Dyne Therapeutics. The Form 3 flags him as a director-level reporting person, triggering ongoing ownership and transaction reporting obligations under SEC rules.

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

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Accepted by SEC EDGAR 06/23/2026 - 04:05 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Greene Barry E

(Last) (First) (Middle)

1560 TRAPELO ROAD

(Street)

WALTHAM MASSACHUSETTS 02451

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/22/2026

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

3a. Foreign Trading Symbol

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit Index: 24.1 Power of Attorney

No securities are beneficially owned.

	/s/ Ron Caponigro, Attorney-in-Fact	06/23/2026
	** 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 5 (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 3: SEC 1473 (03-26)