UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)*

 

 

MYOKARDIA, INC.

(Name of Issuer)

 

 

COMMON STOCK, $0.0001 PAR VALUE PER SHARE

(Title of Class of Securities)

62857M105

(CUSIP Number)

December 31, 2017

(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. 62857M105    SCHEDULE 13G    Page 2 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Third Rock Ventures II, L.P.

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

2,885,104

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

2,885,104

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

2,885,104

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

8.1% (1)

12.  

TYPE OF REPORTING PERSON

 

PN

 

(1) The percent of class was calculated based on 35,741,036 shares of common stock issued and outstanding as of October 31, 2017, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 3, 2017.

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 3 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Third Rock Ventures GP II, L.P.

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

2,885,104

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

2,885,104

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

2,885,104

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

8.1% (1)

12.  

TYPE OF REPORTING PERSON

 

PN

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 4 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

TRV GP II, LLC

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

2,885,104

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

2,885,104

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

2,885,104

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

8.1% (1)

12.  

TYPE OF REPORTING PERSON

 

OO

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 5 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Third Rock Ventures III, L.P.

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

1,496,598

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

1,496,598

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

1,496,598

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

4.2% (1)

12.  

TYPE OF REPORTING PERSON

 

PN

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 6 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Third Rock Ventures GP III, L.P.

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

1,496,598

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

1,496,598

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

1,496,598

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

4.2% (1)

12.  

TYPE OF REPORTING PERSON

 

PN

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 7 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

TRV GP III, LLC

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

1,496,598

   7.   

SOLE DISPOSITIVE POWER

 

0

   8.   

SHARED DISPOSITIVE POWER

 

1,496,598

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

1,496,598

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

4.2% (1)

12.  

TYPE OF REPORTING PERSON

 

OO

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 8 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Mark Levin

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

186,041

   6.   

SHARED VOTING POWER

 

4,381,702

   7.   

SOLE DISPOSITIVE POWER

 

186,041

   8.   

SHARED DISPOSITIVE POWER

 

4,381,702

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

4,567,743

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

12.8% (1)

12.  

TYPE OF REPORTING PERSON

 

IN

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 9 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Kevin P. Starr

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

164,062 (2)

   6.   

SHARED VOTING POWER

 

4,381,702

   7.   

SOLE DISPOSITIVE POWER

 

164,062 (2)

   8.   

SHARED DISPOSITIVE POWER

 

4,381,702

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

4,545,764 (2)

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

12.7% (1)

12.  

TYPE OF REPORTING PERSON

 

IN

 

(2) This number includes options to purchase 18,333 shares exercisable within 60 days of December 31, 2017.

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 10 of 15 Pages

 

  1.  

NAMES OF REPORTING PERSONS

 

Robert I. Tepper

  2.  

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(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

 

201,043

   6.   

SHARED VOTING POWER

 

4,381,702

   7.   

SOLE DISPOSITIVE POWER

 

201,043

   8.   

SHARED DISPOSITIVE POWER

 

4,381,702

  9.  

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

4,582,745

10.  

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ☐

 

11.  

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

12.8% (1)

12.  

TYPE OF REPORTING PERSON

 

IN

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 11 of 15 Pages

 

Item 1.   

     

Issuer    

   (a)    Name of Issuer:
      MYOKARDIA, INC. (the “ Issuer ”)
   (b)    Address of Issuer’s Principal Executive Offices:
     

333 Allerton Avenue

South San Francisco, CA 94080

Item 2.   

      Filing Person
   (a) – (c)   

Name of Persons Filing; Address; Citizenship:

      (i)    Third Rock Ventures II, L.P. (“ TRV II ”);
      (ii)    Third Rock Ventures GP II, L.P. (“ TRV GP II ”), which is the sole general partner of TRV II;
      (iii)    TRV GP II, LLC (“ TRV GP II LLC ”), which is the sole general partner of TRV GP II;
      (iv)    Third Rock Ventures III, L.P. (“ TRV III ”);
      (v)    Third Rock Ventures GP III, L.P. (“ TRV GP III ”), which is the sole general partner of TRV III;
      (vi)    TRV GP III, LLC (“ TRV GP III LLC ”), which is the sole general partner of TRV GP III;
      (vii)    Mark Levin (“ Levin ”), a managing member of TRV GP II LLC and TRV GP III LLC;
      (viii)    Kevin P. Starr (“ Starr ”), a managing member of TRV GP II LLC and TRV GP III LLC; and
      (ix)    Robert I. Tepper (“ Tepper ,” and collectively with TRV II, TRV GP II, TRV GP II LLC, TRV III, TRV GP III, TRV GP III LLC, Levin and Starr, the “ Reporting Persons ”), a managing member of TRV GP II LLC and TRV GP III LLC.
      The address of the principal business office of each of the Reporting Persons is Third Rock Ventures, LLC, 29 Newbury Street, 3rd Floor, Boston, MA 02116.
      Each of TRV II, TRV III, TRV GP II and TRV GP III is a Delaware limited partnership. Each of TRV GP II LLC and TRV GP III LLC is a Delaware limited liability company. Levin, Tepper and Starr are United States citizens.
   (d)    Title of Class of Securities:
      Common stock, $0.0001 par value per share, (the “ Common Stock ”)
   (e)    CUSIP Number:
      62857M105

Item 3.

  

If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:

  

(a)

  

  

Broker or dealer registered under Section 15 of the Act;

  

(b)

  

  

Bank as defined in Section 3(a)(6) of the Act;

  

(c)

  

  

Insurance company as defined in Section 3(a)(19) of the Act;

  

(d)

  

  

Investment company registered under Section 8 of the Investment Company Act of 1940;

  

(e)

  

  

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

  

(f)

  

  

An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

  

(g)

  

  

A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

  

(h)

  

  

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 12 of 15 Pages

 

 

(i)

 

   A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940;
 

(j)

 

   A non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J);
 

(k)

 

   Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
    If filing as a non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J), please specify the type of institution:

Item 4.

 

Ownership.

  (a) and (b)   Amount beneficially owned:
   

(i)

   TRV II directly owns 2,885,104 shares of Common Stock (the “ Fund II Shares ”), which represents approximately 8.1% of the outstanding shares of Common Stock.
   

(ii)

   TRV GP II is the general partner of TRV II and may be deemed to beneficially own the Fund II Shares.
   

(iii)

   TRV GP II LLC is the general partner of TRV GP II and may be deemed to beneficially own the Fund II Shares.
   

(iv)

   TRV III directly owns 1,496,598 shares of Common Stock (the “ Fund III Shares ”), which represents approximately 4.2% of the outstanding shares of Common Stock.
   

(v)

   TRV GP III is the general partner of TRV III and may be deemed to beneficially own the Fund III Shares.
   

(vi)

   TRV GP III LLC is the general partner of TRV GP III and may be deemed to beneficially own the Fund III Shares.
   

(vii)

   As a managing member of TRV GP II LLC and TRV GP III LLC, Levin may be deemed to beneficially own the Fund II Shares and the Fund III Shares. Additionally, as of December 31, 2017, Levin directly owns 186,041 shares of Common Stock. As a result, Levin may be deemed to beneficially own an aggregate of 4,567,743 shares of Common Stock, which represents approximately 12.8% of the outstanding shares of Common Stock.
   

(viii)

   As a managing member of TRV GP II LLC and TRV GP III LLC, Tepper may be deemed to beneficially own the Fund II Shares and the Fund III Shares. Additionally, as of December 31, 2017, Tepper directly owns 201,043 shares of Common Stock. As a result, Tepper may be deemed to beneficially own an aggregate of 4,582,745 shares of Common Stock, which represents approximately 12.8% of the outstanding shares of Common Stock.
   

(ix)

   As a managing member of TRV GP II LLC and TRV GP III LLC, Starr may be deemed to beneficially own the Fund II Shares and the Fund III Shares. Additionally, as of December 31, 2017, Starr directly owns 145,729 shares of Common Stock and options to purchase 18,333 shares of Common Stock exercisable within 60 days of December 31, 2017. As a result, Starr may be deemed to beneficially own an aggregate of 4,545,764 shares of Common Stock, which represents approximately 12.7% of the outstanding shares of Common Stock.

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 13 of 15 Pages

 

 

(c)

   Number of shares as to which such person has:

 

     Number of Shares of Common Stock  

Reporting Person

   (i)      (ii)      (iii)      (iv)  

TRV II

     0        2,885,104        0        2,885,104  

TRV GP II

     0        2,885,104        0        2,885,104  

TRV GP II LLC

     0        2,885,104        0        2,885,104  

TRV III

     0        1,496,598        0        1,496,598  

TRV GP III

     0        1,496,598        0        1,496,598  

TRV GP III LLC

     0        1,496,598        0        1,496,598  

Levin

     186,041        3,565,376        186,041        3,565,376  

Starr

     164,062        3,565,376        164,062        3,565,376  

Tepper

     201,043        3,565,376        201,043        3,565,376  

 

(i) Sole power to vote or direct the vote
(ii) Shared power to vote or to direct the vote
(iii) Sole power to dispose or to direct the disposition of
(iv) Shared power to dispose or to direct the disposition of

 

   The percent of class was calculated based on 35,741,036 shares of common stock issued and outstanding as of October 31, 2017, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 3, 2017.

Item 5.

   Ownership of Five Percent or Less of a Class.
   Not applicable.

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 Group.
   Not applicable.

Item 10.

   Certification.
   Not applicable.

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 14 of 15 Pages

 

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 13, 2018     THIRD ROCK VENTURES II, L.P.
    By:   THIRD ROCK VENTURES GP II, L.P.,
           General Partner
    By:   TRV GP II, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    THIRD ROCK VENTURES GP II, L.P.
    By:   TRV GP II, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    TRV GP II, LLC
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    THIRD ROCK VENTURES III, L.P.
    By:   THIRD ROCK VENTURES GP III, L.P.,
           General Partner
    By:   TRV GP III, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer

 


CUSIP No. 62857M105    SCHEDULE 13G    Page 15 of 15 Pages

 

    THIRD ROCK VENTURES GP III, L.P.
    By:   TRV GP III, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    TRV GP III, LLC
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    MARK LEVIN
    /s/ Kevin Gillis, As attorney-in-fact
    Mark Levin
    KEVIN P. STARR
    /s/ Kevin Gillis, As attorney-in-fact
    Kevin P. Starr
    ROBERT I. TEPPER
    /s/ Kevin Gillis, As attorney-in-fact
    Robert I. Tepper

 


EXHIBIT 24

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Kevin Gillis his true and lawful attorney-in-fact, with full power of substitution, to sign any and all instruments, certificates and documents that may be necessary, desirable or appropriate to be executed on behalf of himself as an individual or in his capacity as a direct or indirect general partner, director, officer, member or manager of any partnership, corporation or limited liability company, pursuant to section 13 or 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any and all regulations promulgated thereunder, and to file the same, with all exhibits thereto, and any other documents in connection therewith, with the Securities and Exchange Commission, and with any other entity when and if such is mandated by the Exchange Act or by the Financial Industry Regulatory Authority, granting unto said attorney-in-fact full power and authority to do and perform each and every act and thing necessary, desirable or appropriate, fully to all intents and purposes as he might or could do in person, thereby ratifying and confirming all that said attorney-in-fact, or his substitutes, may lawfully do or cause to be done by virtue hereof. Each of the undersigned may execute this power of attorney in separate counterparts, and each counterpart shall be deemed to be an original instrument. This agreement shall be effective as to each of the undersigned as of the date signed by that signatory.

IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 16th day of January, 2014.

 

/s/ Mark Levin
Mark Levin
/s/ Kevin P. Starr
Kevin P. Starr
/s/ Robert I. Tepper
Robert I. Tepper


EXHIBIT 99.1

Joint Filing Agreement

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained herein, but shall not be responsible for the completeness and accuracy of the information concerning the other entities or persons, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.

Date: February 13, 2018

 

    THIRD ROCK VENTURES II, L.P.
    By:   THIRD ROCK VENTURES GP II, L.P.,
           General Partner
    By:   TRV GP II, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    THIRD ROCK VENTURES GP II, L.P.
    By:   TRV GP II, LLC,
           General Partner
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer
    TRV GP II, LLC
    By:   /s/ Kevin Gillis
    Kevin Gillis
    Chief Financial Officer


THIRD ROCK VENTURES III, L.P.
By:   THIRD ROCK VENTURES GP III, L.P.,
       General Partner
By:   TRV GP III, LLC,
       General Partner
By:   /s/ Kevin Gillis
Kevin Gillis
Chief Financial Officer
THIRD ROCK VENTURES GP III, L.P.
By:   TRV GP III, LLC,
       General Partner
By:   /s/ Kevin Gillis
Kevin Gillis
Chief Financial Officer
TRV GP III, LLC
By:   /s/ Kevin Gillis
Kevin Gillis
Chief Financial Officer

 

MARK LEVIN
/s/ Kevin Gillis, As attorney-in-fact
Mark Levin

 

KEVIN P. STARR
/s/ Kevin Gillis, As attorney-in-fact
Kevin P. Starr

 

ROBERT I. TEPPER
/s/ Kevin Gillis, As attorney-in-fact
Robert I. Tepper
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