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
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1. Name and Address of Reporting Person*
Brumm Joshua T

(Last) (First) (Middle)
C/O DYNE THERAPEUTICS, INC.
830 WINTER STREET

(Street)
WALTHAM MA 02451

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
09/16/2020
3. Issuer Name and Ticker or Trading Symbol
Dyne Therapeutics, Inc. [ DYN ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
X Officer (give title below) Other (specify below)
See Remarks
5. If Amendment, Date of Original Filed (Month/Day/Year)
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
Stock Option (right to buy) (1) 01/05/2030 Common Stock 557,749 1.03 D
Stock Option (right to buy) (2) 07/30/2030 Common Stock 379,318 5.54 D
Stock Option (right to buy) (3) 07/30/2030 Common Stock 307,863 5.54 D
Explanation of Responses:
1. The option was granted on January 6, 2020. The shares underlying the option vest over four years, with 25% of the shares vesting on October 12, 2020 and the remaining shares vesting in equal quarterly installments thereafter.
2. The option was granted on July 31, 2020. The shares underlying the option vest over four years in equal quarterly installments through July 31, 2024.
3. The option was granted on July 31, 2020. The shares underlying the option vest over four years in equal quarterly installments through July 31, 2024.
Remarks:
Chief Executive Officer and President Exhibit Index: 24.1 Power of Attorney
/s/ Richard Scalzo, Attorney-in-Fact 09/16/2020
** 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.
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