Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Series A Preferred Stock^F2,F3,F1	—	Nov 22, 2017	C	8,335,480	D	—	—	Class B Common Stock	8,335,480	0	I
Series A-1 Preferred Stock^F2,F3,F4	—	Nov 22, 2017	C	1,554,230	D	—	—	Class B Common Stock	1,554,230	0	I
Series C Preferred Stock^F2,F3,F5	—	Nov 22, 2017	C	448,460	D	—	—	Class B Common Stock	448,460	0	I
Class B Common Stock^F2,F3,F6	—	Nov 22, 2017	C	10,338,170	A	—	—	Class A Common Stock	10,338,170	10,338,170	I

Explanation of responses

F1The Series A Preferred Stock automatically converted into shares of Class B Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The Series A Preferred Stock had no expiration date.
F2Shares held by Lightspeed Venture Partners VIII, L.P. ("LVP VIII").
F3Lightspeed Ultimate General Partner VIII, Ltd. ("LUGP VIII") is the sole general partner of Lightspeed General Partner VIII, L.P., which serves as the sole general partner of LVP VIII. Barry Eggers, Ravi Mhatre, Peter Y. Nieh and Christopher J. Schaepe, the directors of LUGP VIII, share voting and dispositive power with respect to the shares held of record by LVP VIII. Each reporting person disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein.
F4The Series A-1 Preferred Stock automatically converted into shares of Class B Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The Series A-1 Preferred Stock had no expiration date.
F5The Series C Preferred Stock automatically converted into shares of Class B Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date.
F6Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock. Any holder's shares of Class B Common Stock will convert automatically into Class A Common Stock, on a one-to-one basis, upon any of the following: (i) sale or transfer of such share of Class B Common Stock; (ii) the death of a stockholder that is a natural person; or (iii) on the final conversion date, defined as the earlier of (a) the first trading day on or after the date on which the outstanding shares of Class B Common Stock represent less than 10% of the then outstanding Class A and Class B Common Stock; (b) the tenth anniversary of the Issuer's initial public offering; or (c) the date specified by vote of the holders of a majority of the outstanding shares of Class B Common Stock, voting as a single class. Once transferred and converted into Class A Common Stock, the Class B Common Stock may not be reissued.