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Filing Details

Accession Number:: 0001104659-20-107953
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2020-09-23 18:55:55
Reporting Period:: 2020-09-21

Accepted Time:: 2020-09-23 18:55:55
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1818794	Dyne Therapeutics Inc.	DYN	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1346824	Ra Capital Management, L.p.	200 Berkeley Street 18Th Floor Boston MA 02116	No	No	Yes	No
1384859	Peter Kolchinsky	200 Berkeley Street 18Th Floor Boston MA 02116	No	No	Yes	No
1619841	M. Rajeev Shah	200 Berkeley Street 18Th Floor Boston MA 02116	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2020-09-21	2,145,045	$0.00	2,145,045	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2020-09-21	660,000	$19.00	2,805,045	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnote
No	4	P	Indirect	See footnote

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2020-09-21	7,114,905	$0.00	2,145,045	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect

Footnotes

The Series B Preferred Stock automatically converted into Common Stock on a 3.3169-for-one basis without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date.
Includes (a) 1,458,068 shares held by RA Capital Healthcare Fund L.P. (the "Fund"), (b) 150,716 shares held in a separately managed account (the "Account") and (c) 536,261 shares held by RA Capital Nexus Fund, L.P. (the "Nexus Fund").
RA Capital Management, L.P. (the "Adviser") is the investment manager for the Fund, the Nexus Fund and the Account. The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, Dr. Kolchinsky, and Mr. Shah may be deemed indirect beneficial owners of the reported securities for purposes of Section 13(d) of the Securities Exchange Act of 1934 (the "Act").
They disclaim beneficial ownership of any of the reported securities for the purpose of determining whether they are subject to Section 16 of the Act, however, in reliance on Rule 16a-1(a)(1)(v) and (vii). To the extent that they might be deemed subject to Section 16, they disclaim beneficial ownership of securities held by the Fund and the Nexus Fund for purposes of Rule 16a-1(a)(2), except to the extent of their pecuniary interest therein, and disclaim any pecuniary interest in securities held in the Account for purposes of Rule 16a-1(a)(2).
Includes (a) 570,747 shares held by the Fund, (b) 57,453 shares held by the Account, and (c) 31,800 shares held by the Nexus Fund, in each case acquired in the Issuer's initial public offering.
Includes (a) 2,028,815 shares held by the Fund, (b) 208,169 shares held by the Account, and (c) 568,061 shares held by the Nexus Fund.