Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Series B Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	2,052,147	D	—	—	Class B Common Stock	2,052,147	0	I
Series B Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	225,590	D	—	—	Class B Common Stock	225,590	0	I
Series B Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	45,536	D	—	—	Class B Common Stock	45,536	0	I
Series C Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	7,579,548	D	—	—	Class B Common Stock	7,579,548	0	I
Series C Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	833,209	D	—	—	Class B Common Stock	833,209	0	I
Series C Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	168,187	D	—	—	Class B Common Stock	168,187	0	I
Series D Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	515,545	D	—	—	Class B Common Stock	515,545	0	I
Series D Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	56,673	D	—	—	Class B Common Stock	56,673	0	I
Series D Convertible Preferred Stock^F5,F3	—	Sep 24, 2018	C	11,440	D	—	—	Class B Common Stock	11,440	0	I
Series G Convertible Preferred Stock^F5,F4	—	Sep 24, 2018	C	539,380	D	—	—	Class B Common Stock	576,325	0	I
Series G Convertible Preferred Stock^F5,F4	—	Sep 24, 2018	C	59,022	D	—	—	Class B Common Stock	63,064	0	I
Series G Convertible Preferred Stock^F5,F4	—	Sep 24, 2018	C	11,963	D	—	—	Class B Common Stock	12,782	0	I
Class B Common Stock^F1,F5,F2	—	Sep 24, 2018	J	10,723,565	A	—	—	Class A Common Stock	10,723,565	10,723,565	I
Class B Common Stock^F1,F5,F2	—	Sep 24, 2018	J	1,178,536	A	—	—	Class A Common Stock	1,178,536	1,178,536	I
Class B Common Stock^F1,F5,F2	—	Sep 24, 2018	J	237,945	A	—	—	Class A Common Stock	237,945	237,945	I
Class B Common Stock^F1,F2,F5	—	Sep 24, 2018	J	1,232,186	A	—	—	Class A Common Stock	1,232,186	1,232,186	I
Class B Common Stock^F1,F2,F5	—	Sep 24, 2018	J	80,186	A	—	—	Class A Common Stock	80,186	80,186	I

Explanation of responses

F1Immediately prior to the closing of the Issuer's initial public offering and following the conversion of each series of the Issuer's convertible preferred stock into common stock, each share of common stock was reclassified into one share of Class B common stock in an exempt transaction pursuant to Rule 16b-7.
F2Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date. Immediately following the conversion of the Issuer's convertible preferred common stock into common stock and immediately prior to the closing of the Issuer's initial public offering, each such share of common stock issued upon conversion thereof was reclassified into one share of Class B common stock.
F3Each share of Series B preferred stock, Series C preferred stock and Series D preferred stock automatically converted into common stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering of Class A common stock and has no expiration date or conversion price. Immediately following the conversion of the Issuer's convertible preferred common stock into common stock and immediately prior to the closing of the Issuer's initial public offering, each such share of common stock issued upon conversion thereof was reclassified into one share of Class B common stock.
F4The Series G preferred stock automatically converted into common stock on a 1:1.0685 basis immediately prior to the closing of the Issuer's initial public offering of Class A common stock and has no expiration date. Immediately following the conversion of the Issuer's Series G preferred stock into common stock and immediately prior to the closing of the Issuer's initial public offering, each such share of common stock issued upon conversion thereof was reclassified into one share of Class B common stock
F5SC US (TTGP), Ltd. is the general partner of SC U.S. Venture 2010 Management, L.P., which is the general partner of each of Sequoia Capital U.S. Venture 2010 Fund, L.P., Sequoia Capital U.S. Venture 2010 Partners Fund (Q), L.P. and Sequoia Capital U.S. Venture 2010 Partners Fund, L.P., or collectively, the SC 2010 Funds. SC US (TTGP), Ltd. is the general partner of SC U.S. Growth VII Management, L.P., which is the general partner of each of Sequoia Capital U.S. Growth Fund VII, L.P. and Sequoia Capital U.S. Growth VII Principals Fund, L.P., or collectively, the SC USGF VII Funds. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of 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 purpose.