Exhibit A

JOINT FILING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule 13D filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Common Stock of Transphorm, Inc., is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below that is named as a reporting person in such filing in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated: March 13, 2020

KKR PHORM INVESTORS L.P.
By:	KKR Phorm Investors GP LLC, its general partner
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Vice President, Finance
KKR PHORM INVESTORS GP LLC
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Vice President, Finance
KKR GROUP PARTNERSHIP L.P.
By:	KKR Group Holdings Corp., general partner
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact for
	Robert H. Lewin, Chief Financial Officer
KKR GROUP HOLDINGS CORP.
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact for
	Robert H. Lewin, Chief Financial Officer
KKR & CO. INC.
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact for
	Robert H. Lewin, Chief Financial Officer

KKR MANAGEMENT LLP
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact for
	Robert H. Lewin, Chief Financial Officer
HENRY R. KRAVIS
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact
GEORGE R. ROBERTS
By:	/s/ Terence P. Gallagher
	Name: Terence P. Gallagher
	Title: Attorney-in-fact