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* Logos Global Management LP (Last) (First) (Middle) 1 LETTERMAN DRIVE, SUITE D3-700 (Street) SAN FRANCISCO CA 94129 (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) Director X 10% Owner Officer (give title below) Other (specify below)	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
Series B Preferred Stock	(1)	(1)	Common Stock	804,392	(1)	I	See footnotes(2)(3)

Explanation of Responses:

1. The Series B Preferred Stock is convertible into common stock on a 3.3169-for-1 basis into the number of shares of common stock shown in Column 3 without payment of further consideration at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date.

2. The reporting persons are Logos Opportunities Fund II LP (the "Fund"), Logos Global Management LP ("LGM"), Logos Global Management GP LLC ("LGM GP"), Logos Opportunities GP LLC ("Fund GP"), Logos GP LLC ("Logos GP"), Dr. Arsani William and Dr. Graham Walmsley. LGM is the investment adviser of private funds, including the Fund. LGM GP is the general partner of LGM. Fund GP is the general partner of the Fund. Logos GP is the manager of Fund GP. Dr. William and Dr. Walmsley are controlling persons of LGM and Logos GP and managers of the Fund. LGM is filing this report for itself and the other reporting persons. The reporting persons are filing this Form 3 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 13d-5(b) under the Securities Exchange Act of 1934.

3. The Fund holds the securities reported herein directly for the benefit of its investors. The securities may be deemed to be indirectly beneficially owned by LGM as investment adviser to the Fund, by LGM GP as general partner of LGM, by Fund GP as general partner of the Fund, by Logos GP as manager of Fund GP and by Dr. William and Dr. Walmsley as controlling persons of LGM and Logos GP. The reporting persons disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

Remarks:

	/s/ Arsani William, Managing Partner	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).
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