Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1,F2,F3	Feb 21, 2018	C	1,500,000	—	A	1,500,000	I	by Lightspeed Venture Partners VII, L.P.
Class A Common Stock^F4,F2,F3	Feb 21, 2018	J	1,500,000	—	D	0	I	By Lightspeed Venture Partners VII, L.P.
Class A Common Stock^F4,F2,F5	Feb 21, 2018	J	386,250	—	A	386,250	I	By Lightspeed General Partner VII, L.P.
Class A Common Stock^F6,F2,F5	Feb 21, 2018	J	386,250	—	D	0	I	By Lightspeed General Partner VII, L.P.
Class A Common Stock^F6,F7	Feb 21, 2018	J	56,359	—	A	56,359	I	By Barry Eggers Revocable Trust dtd 6/4/2008
Class A Common Stock^F6	Feb 21, 2018	J	56,359	—	A	172,037	I	By Peter Y. Nieh
Class A Common Stock^F6,F8	Feb 21, 2018	J	56,359	—	A	172,415	I	By the Schaepe-Chiu Living Trust dated 11/5/97
Class A Common Stock^F9	holding	—	—		—	945	I	By Nieh Investments LP ? Fund 3
Class A Common Stock^F10	holding	—	—		—	567	I	By Schaepe-Chiu Investments I LP ? Fund 2

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Class B Common Stock^F1,F2,F3,F11	—	Feb 21, 2018	C	1,500,000	D	—	—	Class A Common Stock	1,500,000	10,847,715	I
Class B Common Stock^{F13,F14,F11,F12}	—	holding	—	—	—	—	—	Class A Common Stock	0	3,171,808	I

Explanation of responses

F1Represents conversion of shares of the Issuer's Class B Common Stock into shares of the Issuer's Class A Common Stock on a 1-for-1 basis. The convertibility of the Class B Common Stock has no expiration date.
F10The shares are held of record by Schaepe-Chiu Investments I LP-Fund 2. Christopher J. Schaepe serves as co-trustee of the general partner of such entity.
F11Shares of the Issuer's Class B Common Stock are convertible into shares of the Issuer's Class A Common Stock on a 1-for-1 basis. The convertibility of the Class B Common Stock has no expiration date.
F12Reflects holding of Class B Common Stock by Lightspeed Venture Partners Select, L.P. No transfer of Class B Common Stock by such entity is being reported on this Form 4.
F13Lightspeed Ultimate General Partner Select, Ltd. is the sole general partner of Lightspeed General Partner Select, L.P. ("LGP Select"), which is the sole general partner of Lightspeed Venture Partners Select, L.P. ("Lightspeed Select"). The individual directors of Lightspeed Ultimate General Partner Select, Ltd. are Barry Eggers, Jeremy Liew, Ravi Mhatre, Peter Nieh and Christopher J. Schaepe. Messrs. Eggers, Liew, Mhatre, Nieh and Schaepe disclaim their beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F14The shares are held of record by Lightspeed Select.
F2Lightspeed Ultimate General Partner VII, Ltd. is the sole general partner of Lightspeed General Partner VII, L.P. ("LGP VII"), which is the sole general partner of Lightspeed Venture Partners VII, L.P. ("Lightspeed VII"). The individual directors of Lightspeed Ultimate General Partner VII, Ltd. are Christopher J. Schaepe, Barry Eggers, Ravi Mhatre and Peter Nieh. Messrs. Schaepe, Eggers, Mhatre, and Nieh disclaim their beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F3The shares are held of record by Lightspeed VII.
F4Represents in-kind distribution by Lightspeed VII without consideration to its partners (including LGP VII, the general partner of Lightspeed VII).
F5The shares are held of record by LGP VII.
F6Represents in-kind distribution by LGP VII without consideration to its partners (including Messrs. Schaepe, Eggers, Mhatre, and Nieh).
F7The shares are held of record by Barry Eggers Revocable Trust dtd 6/4/2008, for which Barry Eggers serves as trustee.
F8The shares are held of record by The Schaepe-Chiu Living Trust Dated November 5, 1997, for which Christopher J. Schaepe serves as co-trustee.
F9The shares are held of record by Nieh Family Investments LP-Fund 3. Peter Nieh serves as co-trustee of the general partner of such entity.

Remarks

Mr. Mhatre is a director of the Issuer and files a separate report on Form 4 with respect to his beneficial ownership of Issuer securities held by the Lightspeed entities.