Lightspeed Venture Partners Viii SC 13D/A Personalis / LIGHTSPEED VENTURE PARTNERS VIII ownership change

EXHIBIT 99.4

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Statement on Schedule 13D to which this exhibit is attached is filed on behalf of each of them in the capacities set forth below.

Dated: June 28, 2024
	Lightspeed Venture Partners VIII, L.P.
	By:	Lightspeed General Partner VIII, L.P.
	Its:	General Partner
	By:	Lightspeed Ultimate General Partner VIII, Ltd.
	Its:	General Partner
	By:	/s/ Ravi Mhatre
		Authorized Representative

Lightspeed General Partner VIII, L.P.
By:	Lightspeed Ultimate General Partner VIII, Ltd.
Its:	General Partner
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed Ultimate General Partner VIII, Ltd.
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed Venture Partners Select, L.P.
By:	Lightspeed General Partner Select, L.P.
Its:	General Partner
By:	Lightspeed Ultimate General Partner Select, Ltd.
Its:	General Partner
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed General Partner Select, L.P.
By:	Lightspeed Ultimate General Partner Select, Ltd.
Its:	General Partner
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed Ultimate General Partner Select, Ltd.
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed Venture Partners Select IV, L.P.
By:	Lightspeed General Partner Select IV, L.P.
Its:	General Partner
By:	Lightspeed Ultimate General Partner Select IV, L.L.C.
Its:	General Partner
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed General Partner Select IV, L.P.
By:	Lightspeed Ultimate General Partner Select IV, L.L.C.
Its:	General Partner
By:	/s/ Ravi Mhatre
	Authorized Representative

Lightspeed Ultimate General Partner Select IV, L.L.C.
By:	/s/ Ravi Mhatre
	Authorized Representative
By:	/s/ Barry Eggers
	Barry Eggers
By:	/s/ Ravi Mhatre
	Ravi Mhatre
By:	/s/ Peter Y. Nieh
	Peter Y. Nieh
By:	/s/ Arif Janmohamed
	Arif Janmohamed

LSVP VIII Trust
By:	Lightspeed Trustee VIII, LLC
Its:	Trustee
By:	/s/ Barry Eggers
	Member
By:	/s/ Ravi Mhatre
	Member
By:	/s/ Peter Y. Nieh
	Member

Lightspeed Trustee VIII, LLC
By:	/s/ Barry Eggers
	Member
By:	/s/ Ravi Mhatre
	Member
By:	/s/ Peter Y. Nieh
	Member