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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.     )*

 

 

Pliant Therapeutics, Inc.

(Name of Issuer)

COMMON STOCK, $0.0001 PAR VALUE PER SHARE

(Title of Class of Securities)

729139 105

(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).

 

 

 

CUSIP No. 729139 105    SCHEDULE 13G    Page 2 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

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  PN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 3 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

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  PN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 4 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

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  OO

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 5 of 15 Pages

 

  1.    

  NAMES OF REPORTING PERSONS

 

  Third Rock Ventures IV, 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

 

  2,132,867

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  2,132,867

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  2,132,867

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  6.0% (1)

12.  

  TYPE OF REPORTING PERSON

 

  PN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 6 of 15 Pages

 

  1.    

  NAMES OF REPORTING PERSONS

 

  Third Rock Ventures GP IV, 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

 

  2,132,867

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  2,132,867

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  2,132,867

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  6.0% (1)

12.  

  TYPE OF REPORTING PERSON

 

  PN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 7 of 15 Pages

 

  1.    

  NAMES OF REPORTING PERSONS

 

  TRV GP IV, 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

 

  2,132,867

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  2,132,867

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  2,132,867

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  6.0% (1)

12.  

  TYPE OF REPORTING PERSON

 

  OO

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    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

 

  0

   6.   

  SHARED VOTING POWER

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  IN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    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

 

  0

   6.   

  SHARED VOTING POWER

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  IN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    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

 

  0

   6.   

  SHARED VOTING POWER

 

  5,839,160

   7.   

  SOLE DISPOSITIVE POWER

 

  0

   8.   

  SHARED DISPOSITIVE POWER

 

  5,839,160

  9.    

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

 

  5,839,160

10.  

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

 

  ☐

11.  

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

 

  16.5% (1)

12.  

  TYPE OF REPORTING PERSON

 

  IN

 

(1)

The percent of class was calculated based on 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.

CUSIP No. 729139 105    SCHEDULE 13G    Page 11 of 15 Pages

 

Item 1.      Issuer
   (a)   Name of Issuer:
     Pliant Therapeutics, Inc. (the “Issuer”)
   (b)   Address of Issuer’s Principal Executive Offices:
    

260 Littlefield Avenue

South San Francisco, CA 94080

Item 2.      Filing Person
   (a) – (c)   Name of Persons Filing; Address; Citizenship:
    

(i)  Third Rock Ventures GP III, L.P. (“TRV GP III”), which is the sole general partner of TRV III;

 

(ii)  TRV GP III, LLC (“TRV GP III LLC”), which is the sole general partner of TRV GP III;

 

(iii)   Third Rock Ventures III, L.P. (“TRV III”);

 

(iv) Third Rock Ventures GP IV, L.P. (“TRV GP IV”), which is the sole general partner of TRV IV;

 

(v)   TRV GP IV, LLC (“TRV GP IV LLC”), which is the sole general partner of TRV GP IV;

 

(vi) Third Rock Ventures IV, L.P. (“TRV IV”);

 

(vii)  Mark Levin (“Levin”), a managing member of TRV GP III LLC;

 

(viii)  Kevin P. Starr (“Starr”), a managing member of TRV GP III LLC; and

 

(ix) Robert I. Tepper (“Tepper,” and collectively with TRV III, TRV GP III, TRV GP III LLC, TRV IV, TRV GP IV, TRV GP IV LLC, Levin and Starr, the “Reporting Persons”), a managing member of 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 III, TRV GP III, TRV IV and TRV GP IV is a Delaware limited partnership. Each of TRV GP III LLC and TRV GP IV 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:

 

729139 105

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. 729139 105    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 III directly owns 5,839,160 shares of Common Stock (the “III Shares”), which represents approximately 16.5% of the outstanding shares of Common Stock.

     

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

     

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

     

(iv)   TRV IV directly owns 2,132,867 shares of Common Stock (the “IV Shares”), which represents approximately 6.0% of the outstanding shares of Common Stock.

     

(v)  TRV GP IV is the general partner of TRV IV and may be deemed to beneficially own the IV Shares.

     

(vi)   TRV GP IV LLC is the general partner of TRV GP IV and may be deemed to beneficially own the IV Shares

     

(vii) As a managing member of TRV GP III LLC, Levin may be deemed to beneficially own the III Shares.

     

(viii) As a managing member of TRV GP III LLC, Tepper may be deemed to beneficially own the III Shares.

     

(ix)   As a managing member of TRV GP III LLC, Starr may be deemed to beneficially own the III Shares.

   Each of TRV III, TRV GP III, TRV GP III LLC, Levin, Starr and Tepper, on the one hand, and TRV IV, TRV GP IV and TRV GP IV LLC, on the other hand, disclaim the existence of a “group” for purposes of Rule 13d-5 of the Securities Exchange Act of 1934, as amended, and nothing contained in this report shall be deemed an admission that any such group exists or may exist.
   (c)    Number of shares as to which such person has:

 

     Number of Shares of Common Stock  

Reporting Person

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

TRV III

      0        5,839,160        0        5,839,160  

TRV GP III

      0        5,839,160        0        5,839,160  

TRV GP III LLC

      0        5,839,160        0        5,839,160  

TRV IV

      0        2,132,867        0        2,132,867  

TRV GP IV

      0        2,132,867        0        2,132,867  

TRV GP IV LLC

      0        2,132,867        0        2,132,867  

Levin

      0        5,839,160        0        5,839,160  

Starr

      0        5,839,160        0        5,839,160  

Tepper

      0        5,839,160        0        5,839,160  

CUSIP No. 729139 105    SCHEDULE 13G    Page 13 of 15 Pages

 

  

(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 35,479,853 shares of common stock issued and outstanding as of November 7, 2020, as disclosed in the Issuer’s 10-Q filed with the Securities and Exchange Commission on November 10, 2020.
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. 729139 105    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 16, 2021

 

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 Operating Officer
THIRD ROCK VENTURES GP III, L.P.
By: TRV GP III, LLC,
General Partner
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
TRV GP III, LLC
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
THIRD ROCK VENTURES IV, L.P.
By: THIRD ROCK VENTURES GP IV, L.P.,
General Partner
By: TRV GP IV, LLC,
General Partner
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
THIRD ROCK VENTURES GP IV, L.P.
By: TRV GP IV, LLC,
General Partner

CUSIP No. 729139 105    SCHEDULE 13G    Page 15 of 15 Pages

 

By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
TRV GP IV, LLC
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating 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.

Dated: February 16, 2021

 

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 Operating Officer
THIRD ROCK VENTURES GP III, L.P.
By: TRV GP III, LLC,
General Partner
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
TRV GP III, LLC
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
THIRD ROCK VENTURES IV, L.P.
By: THIRD ROCK VENTURES GP IV, L.P.,
General Partner
By: TRV GP IV, LLC,
General Partner
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer

THIRD ROCK VENTURES GP IV, L.P.
By: TRV GP IV, LLC,
General Partner
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating Officer
TRV GP IV, LLC
By:  

/s/ Kevin Gillis

Kevin Gillis
Chief Operating 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