Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
COMMON STOCK^F1,F2	Oct 9, 2018	C	2,046,035	—	A	2,046,035	I	By Lightspeed Venture Partners Select, L.P.
COMMON STOCK^F1,F2	Oct 9, 2018	C	508,497	—	A	2,554,532	I	By Lightspeed Venture Partners Select, L.P.
COMMON STOCK^F1,F2	Oct 9, 2018	C	44,866	—	A	2,599,398	I	By Lightspeed Venture Partners Select, L.P.

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
SERIES C PREFERRED STOCK^F1,F2	—	Oct 9, 2018	C	2,046,035	D	—	—	COMMON STOCK	2,046,035	I
SERIES D PREFERRED STOCK^F1,F2	—	Oct 9, 2018	C	508,497	D	—	—	COMMON STOCK	508,497	I
SERIES E PREFERRED STOCK^F1,F2	—	Oct 9, 2018	C	44,866	D	—	—	COMMON STOCK	44,866	I

Explanation of responses

F1The shares of Preferred Stock automatically converted into shares of the Issuer's Common Stock, for no additional consideration, at the then-effective conversion rate for no additional consideration (subject to the payment of cash in lieu of any fractional shares in accordance with the Certificate of Incorporation) immediately prior to the consummation of the Issuer's initial public offering, and have no expiration date.
F2The shares are directly held by Lightspeed Venture Partners Select, L.P. Lightspeed Ultimate General Partner Select, Ltd. ("LUGP Select") is the sole general partner of Lightspeed General Partner Select, L.P., which is the sole general partner of Lightspeed Venture Partners Select, L.P. Barry Eggers, Jeremy Liew, Ravi Mhatre, Peter Nieh and Christopher J. Schaepe are the directors of LUGP Select and share voting and dispositive power with respect to the shares held by Lightspeed Venture Partners Select, L.P. Each Reporting Person disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.