SC 13G/A 1 d423457dsc13ga.htm SC 13G/A SC 13G/A

 

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

 

 

Dyne Therapeutics, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

26818M108

(CUSIP Number)

December 31, 2022

(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).

 

 

 

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)

 

  8.9%

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)

 

  9.3%

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 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)

 

  9.5%

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)

 

  9.5%

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)

 

  9.5%

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)

 

  9.5%

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

 

  19,596*

   6.  

  Shared Voting Power

 

  4,951,303**

   7.  

  Sole Dispositive Power

 

  19,596*

   8.  

  Shared Dispositive Power

 

  4,951,303**

  9.    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  4,970,899* **

10.  

  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

 

11.  

  Percent of Class Represented by Amount in Row (9)

 

  9.5%

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.

**

Includes 19,596 shares exercisable pursuant to options within 60 days of December 31, 2022.

 

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

399 Boylston Street, Suite 1100

Boston, MA 02116

 

  (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        8.9 % 

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        9.3 % 

BV 2018 LLC(2)

      0        0        4,951,303        0        4,951,303        4,951,303        9.5 % 

Luke Evnin(3)

      0        0        4,951,303        0        4,951,303        4,951,303        9.5 % 

Ansbert Gadicke(3)

      0        0        4,951,303        0        4,951,303        4,951,303        9.5 % 

Todd Foley(3)

      0        0        4,951,303        0        4,951,303        4,951,303        9.5 % 

Ed Hurwitz(3)(4)

      19,596        19,596        4,951,303        19,596        4,951,303        4,970,899        9.5 % 

 

(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.

(4)

Includes 19,596 shares exercisable pursuant to options within 60 days of December 31, 2022.

 

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 8, 2023
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