SEC Filing | Dyne Therapeutics, Inc.

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SC 13G

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. )*

Dyne Therapeutics, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

26818M108

(CUSIP Number)

December 31, 2020

(Date of Event Which Requires Filing of This Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

*	The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons MPM BioVentures 2018, L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 4,614,943
		6.	Shared Voting Power 0
		7.	Sole Dispositive Power 4,614,943
		8.	Shared Dispositive Power 0
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,614,943
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.2%
12.	Type of Reporting Person (See Instructions) PN

Page 2 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons MPM BioVentures 2018 (B), L.P.
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization Germany
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 245,279
		6.	Shared Voting Power 0
		7.	Sole Dispositive Power 245,279
		8.	Shared Dispositive Power 0
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 245,279
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 0.5%
12.	Type of Reporting Person (See Instructions) PN

Page 3 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons MPM Asset Management Investors BV2018 LLC
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 91,081
		6.	Shared Voting Power 0
		7.	Sole Dispositive Power 91,081
		8.	Shared Dispositive Power 0
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 91,081
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 0.2%
12.	Type of Reporting Person (See Instructions) OO

Page 4 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons MPM BioVentures 2018 GP LLC
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,860,222*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,860,222*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,860,222*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.7%
12.	Type of Reporting Person (See Instructions) PN

Consists of 4,614,943 shares held by MPM BioVentures 2018, L.P. (“BV 2018”) and 245,279 shares held by MPM BioVentures 2018(B), L.P. (“BV 2018(B)”). MPM BV BioVentures 2018 GP LLC (“BV 2018 GP”) and MPM BioVentures 2018 LLC (“BV 2018 LLC”) are the direct and indirect general partners of BV 2018 and BV 2018(B).

Page 5 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons MPM BioVentures 2018 LLC
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,951,303*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,951,303*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,951,303*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.9%
12.	Type of Reporting Person (See Instructions) OO

Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by MPM Asset Management Investors BV2018 LLC (“AM BV 2018 LLC”). BV 2018 GP and BV 2018 LLC are the direct and indirect general partners of BV 2018 and BV 2018(B). BV 2018 LLC is the manager of AM BV 2018 LLC.

Page 6 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons Luke Evnin
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,951,303*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,951,303*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,951,303*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.9%
12.	Type of Reporting Person (See Instructions) IN

*	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Page 7 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons Ansbert Gadicke
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,951,303*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,951,303*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,951,303*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.9%
12.	Type of Reporting Person (See Instructions) IN

*	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Page 8 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons Todd Foley
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,951,303*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,951,303*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,951,303*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.9%
12.	Type of Reporting Person (See Instructions) IN

*	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Page 9 of 16

CUSIP No. 26818M108


1.	Name of Reporting Persons Ed Hurwitz
2.	Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.	SEC USE ONLY
4.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With:		5.	Sole Voting Power 0
		6.	Shared Voting Power 4,951,303*
		7.	Sole Dispositive Power 0
		8.	Shared Dispositive Power 4,951,303*
9.	Aggregate Amount Beneficially Owned by Each Reporting Person 4,951,303*
10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)
11.	Percent of Class Represented by Amount in Row (9) 10.9%
12.	Type of Reporting Person (See Instructions) IN

*	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Page 10 of 16

Item 1.

(a)

Name of Issuer

Dyne Therapeutics, Inc.

(b)

Address of Issuer’s Principal Executive Offices

80 Winter Street

Waltham MA 02451

Item 2.

(a)

Name of Person Filing

MPM BioVentures 2018, L.P.

MPM BioVentures 2018(B), L.P.

MPM Asset Management Investors BV2018 LLC

MPM BioVentures 2018 GP LLC

MPM BioVentures 2018 LLC

Luke Evnin

Ansbert Gadicke

Todd Foley

Ed Hurwitz

(b)

Address of Principal Business Office or, if none, Residence

c/o MPM Capital LLC

450 Kendall Street

Cambridge, MA 02142

(c)

Citizenship

All entities were organized in Delaware. The individuals are all United States citizens.

(d)

Title of Class of Securities

Common Stock

(e)

CUSIP Number

26818M108

Item 3.

If this statement is filed pursuant to §§240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable

Page 11 of 16

Item 4.

Ownership


MPM Entity	Shares Held Directly		Sole Voting Power		Shared Voting Power		Sole Dispositive Power		Shared Dispositive Power		Beneficial Ownership		Percentage of Class
BV 2018		4,614,943		4,614,943		0		4,614,943		0		4,614,943		10.2	%
BV 2018(B)		245,279		245,279		0		245,279		0		245,279		0.5	%
AM BV 2018 LLC		91,081		91,081		0		91,081		0		91,081		0.2	%
BV 2018 GP(1)		0		0		4,860,222		0		4,860,222		4,860,222		10.7	%
BV 2018 LLC(2)		0		0		4,951,303		0		4,951,303		4,951,303		10.9	%
Luke Evnin(3)		0		0		4,951,303		0		4,951,303		4,951,303		10.9	%
Ansbert Gadicke(3)		0		0		4,951,303		0		4,951,303		4,951,303		10.9	%
Todd Foley(3)		0		0		4,951,303		0		4,951,303		4,951,303		10.9	%
Ed Hurwitz(3)		0		0		4,951,303		0		4,951,303		4,951,303		10.9	%

(1)	Consists of 4,614,943 shares held by BV 2018 and 245,279 shares held by BV 2018(B). BV 2018 GP and BV 2018 LLC are the direct and indirect general partners of BV 2018 and BV 2018(B).

(2)	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV2018 LLC. BV 2018 GP and BV 2018 LLC are the direct and indirect general partners of BV 2018 and BV 2018(B). BV 2018 LLC is the manager of AM BV2018 LLC.

(3)	Consists of 4,614,943 shares held by BV 2018, 245,279 shares held by BV 2018(B) and 91,081 shares held by AM BV2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Item 5.

Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☐.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Not Applicable

Item 8.

Identification and Classification of Members of the Group

Not Applicable

Item 9.

Notice of Dissolution of a Group

Not Applicable

Item 10.

Certification

Not Applicable

Page 12 of 16

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 11, 2021


MPM BIOVENTURES 2018, L.P.

By:	MPM BioVentures 2018 GP LLC,
	its General Partner
By:	MPM BioVentures 2018 LLC,
	Its Managing Member

By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director

MPM BIOVENTURES 2018 (B), L.P.

By:	MPM BioVentures 2018 GP LLC,
	its General Partner
By:	MPM BioVentures 2018 LLC,
	Its Managing Member

By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director

MPM ASSET MANAGEMENT INVESTORS BV2018 LLC

By:	MPM BioVentures 2018 LLC,
	Its Manager

By:	/s/ Luke Evnin
Name:	Luke Evnin
	Title:	Managing Director

MPM BIOVENTURES 2018 GP LLC

By:	MPM BioVentures 2018 LLC,
	Its Managing Member

By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director

Page 13 of 16


MPM BIOVENTURES 2018 LLC

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

By:		/s/ Todd Foley
Name:		Todd Foley

By:		/s/ Luke Evnin
Name:		Luke Evnin

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke

By:		/s/ Edward Hurwitz
Name:		Edward Hurwitz

EXHIBITS


A:		Joint Filing Agreement

Page 14 of 16

EX-99.A

EXHIBIT A

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Dyne Therapeutics, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to the agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this joint filing agreement may be signed in counterparts.

In evidence whereof, the undersigned have caused this Agreement to be executed on their behalf this 11th day of February, 2021.


		MPM BIOVENTURES 2018, L.P.

		By:		MPM BioVentures 2018 GP LLC,
				its General Partner
		By:		MPM BioVentures 2018 LLC,
				Its Managing Member

		By:		/s/ Luke Evnin
		Name:		Luke Evnin
		Title:		Managing Director

		MPM BIOVENTURES 2018 (B), L.P.

		By:		MPM BioVentures 2018 GP LLC,
				its General Partner
		By:		MPM BioVentures 2018 LLC,
				Its Managing Member

		By:		/s/ Luke Evnin
		Name:		Luke Evnin
		Title:		Managing Director

		MPM ASSET MANAGEMENT INVESTORS BV2018 LLC

		By:		MPM BioVentures 2018 LLC,
				Its Manager

		By:		/s/ Luke Evnin
		Name:		Luke Evnin
				Title: Managing Director

		MPM BIOVENTURES 2018 GP LLC

		By:		MPM BioVentures 2018 LLC,
				Its Managing Member

		By:		/s/ Luke Evnin
		Name:		Luke Evnin
		Title:		Managing Director

Page 15 of 16


		MPM BIOVENTURES 2018 LLC

		By:		/s/ Luke Evnin
		Name:		Luke Evnin
		Title:		Managing Director

		By:		/s/ Todd Foley
		Name:		Todd Foley

		By:		/s/ Luke Evnin
		Name:		Luke Evnin

		By:		/s/ Ansbert Gadicke
		Name:		Ansbert Gadicke

		By:		/s/ Edward Hurwitz
		Name:		Edward Hurwitz

Page 16 of 16