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