Form: SC 13D/A

Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities

February 14, 2019

CUSIP No. 89532E109       Page 1 of 2

 

Exhibit A

AGREEMENT REGARDING THE JOINT FILING OF

SCHEDULE 13D

The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of each such party.

Date: February 13, 2019

 

POLARIS VENTURE PARTNERS V, L.P.
By:   Polaris Venture Management Co. V, L.L.C.
By:  

*

  Authorized Signatory
POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND V, L.P.
By:   Polaris Venture Management Co. V, L.L.C.
By:  

*

  Authorized Signatory
POLARIS VENTURE PARTNERS FOUNDERS’ FUND V, L.P.
By:   Polaris Venture Management Co. V, L.L.C.
By:  

*

  Authorized Signatory


CUSIP No. 89532E109       Page 2 of 2

 

POLARIS VENTURE PARTNERS SPECIAL FOUNDERS’ FUND V, L.P.
By:   Polaris Venture Management Co. V, L.L.C.
By:  

*

  Authorized Signatory
POLARIS VENTURE MANAGEMENT CO. V, L.L.C.
By:  

*

  Authorized Signatory
JONATHAN A. FLINT
By:  

*

  Jonathan A. Flint
TERRANCE G. MCGUIRE
By:  

*

  Terrance G. McGuire

 

* By:  

/s/ Max Eisenberg

Name:   Max Eisenberg
  Attorney-in-Fact

This Schedule 13D was executed pursuant to a Power of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies