Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^{F1,F2,F3,F4,F5,F6,F7}	Oct 31, 2017	C	3,703,261	—	A	3,703,261	I	See footnote
Common Stock^{F1,F2,F3,F4,F5,F6,F8}	Oct 31, 2017	C	727,365	—	A	727,365	I	See footnote
Common Stock^{F1,F2,F3,F4,F5,F6,F9}	Oct 31, 2017	C	320,654	—	A	320,654	I	See footnote
Common Stock^F10	holding	—	—		—	25,000	I	See footnote

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
Series B Convertible Preferred Stock^F7,F1	—	Oct 31, 2017	C	23,100	D	—	—	Common Stock	1,218,301	I
Series B Convertible Preferred Stock^F8,F1	—	Oct 31, 2017	C	4,537	D	—	—	Common Stock	239,282	I
Series B Convertible Preferred Stock^F9,F1	—	Oct 31, 2017	C	2,000	D	—	—	Common Stock	105,480	I
Series C Convertible Preferred Stock^F7,F2	—	Oct 31, 2017	C	6,021	D	—	—	Common Stock	317,547	I
Series C Convertible Preferred Stock^F8,F2	—	Oct 31, 2017	C	1,182	D	—	—	Common Stock	62,338	I
Series C Convertible Preferred Stock^F9,F2	—	Oct 31, 2017	C	521	D	—	—	Common Stock	27,476	I
Series D Convertible Preferred Stock^F7,F3	—	Oct 31, 2017	C	953,737	D	—	—	Common Stock	953,737	I
Series D Convertible Preferred Stock^F8,F3	—	Oct 31, 2017	C	187,346	D	—	—	Common Stock	187,346	I
Series D Convertible Preferred Stock^F9,F3	—	Oct 31, 2017	C	82,597	D	—	—	Common Stock	82,597	I
Series D-1 Convertible Preferred Stock^F7,F4	—	Oct 31, 2017	C	183,308	D	—	—	Common Stock	183,308	I
Series D-1 Convertible Preferred Stock^F8,F4	—	Oct 31, 2017	C	36,007	D	—	—	Common Stock	36,007	I
Series D-1 Convertible Preferred Stock^F9,F4	—	Oct 31, 2017	C	15,875	D	—	—	Common Stock	15,875	I
Series E Convertible Preferred Stock^F7,F5	—	Oct 31, 2017	C	777,612	D	—	—	Common Stock	777,612	I
Series E Convertible Preferred Stock^F8,F5	—	Oct 31, 2017	C	152,742	D	—	—	Common Stock	152,742	I
Series E Convertible Preferred Stock^F9,F5	—	Oct 31, 2017	C	67,336	D	—	—	Common Stock	67,336	I
Series F Convertible Preferred Stock^F7,F6	—	Oct 31, 2017	C	252,756	D	—	—	Common Stock	252,756	I
Series F Convertible Preferred Stock^F8,F6	—	Oct 31, 2017	C	49,650	D	—	—	Common Stock	49,650	I
Series F Convertible Preferred Stock^F9,F6	—	Oct 31, 2017	C	21,890	D	—	—	Common Stock	21,890	I

Explanation of responses

F1The Series B Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:52.7 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F10The shares are held directly by ACP Family Partnership L.P. Members of Arthur C. Patterson's immediate family are beneficial holders of ACP Family Partnership L.P., and the reporting person may be deemed to exercise voting and investment power over such shares.
F2The Series C Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:52.7 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F3The Series D Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F4The Series D-1 Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F5The Series E Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F6The Series F Convertible Preferred Stock automatically converted into Common Stock on an approximate 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.
F7The shares are held of record by Accel VIII L.P. ("Accel VIII"). Arthur C. Patterson and James R. Swartz are the managing members of Accel VIII Associates LLC ("Accel Associates"), the general partner of Accel VIII, and share voting and dispositive power over the shares held by Accel VIII. Each of the reporting persons disclaims beneficial ownership of these shares except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that any reporting person is the beneficial owner of these shares for purposes of Section 16 or for any other purpose.
F8The shares are held of record by Accel Internet Fund IV L.P. ("Fund IV"). Messrs. Patterson and Swartz are the managing members of Accel Associates, the general partner of Fund IV, and share voting and dispositive power over the shares held by Fund IV. Each of the reporting persons disclaims beneficial ownership of these shares except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that any reporting person is the beneficial owner of these shares for purposes of Section 16 or for any other purpose.
F9The shares are held of record by Accel Investors 2000 L.L.C. ("Investors 2000"). Messrs. Patterson and Swartz are the managing members of Investors 2000 and share voting and dispositive power over the shares held by Investors 2000. Each of the reporting persons disclaims beneficial ownership of these shares except to the extent of any pecuniary interest therein, and the filing of this report is not an admission that any reporting person is the beneficial owner of these shares for purposes of Section 16 or for any other purpose.