Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1,F2,F3	Jun 7, 2017	J	3,759,643	—	D	0	I	By Lightspeed Venture Partners VIII, L.P.
Class A Common Stock^F1,F2,F4	Jun 7, 2017	J	875,054	—	A	875,054	I	By Lightspeed General Partner VIII, L.P.
Class A Common Stock^F5,F2,F4	Jun 7, 2017	J	875,054	—	D	0	I	By Lightspeed General Partner VIII, L.P.
Class A Common Stock^F5,F6	Jun 7, 2017	J	113,227	—	A	113,227	I	By Eggers Investments LP - Fund 1
Class A Common Stock^F5,F7	Jun 7, 2017	J	113,227	—	A	113,227	I	By Nieh Family Investments LP - Fund 1
Class A Common Stock^F5,F8	Jun 7, 2017	J	113,227	—	A	152,075	I	By Schaepe-Chiu Investments I LP - Fund 1
Class A Common Stock^F9,F6	Jun 8, 2017	S	113,227	$17.7528	D	0	I	By Eggers Investments LP - Fund 1
Class A Common Stock^F10,F11	holding	—	—		—	190,363	I	By Lightspeed Venture Partners Select, L.P.
Class A Common Stock	holding	—	—		—	200,000	I	By Peter Nieh
Class A Common Stock^F12	holding	—	—		—	213,955	I	By The Schaepe-Chiu Living Trust Dated 11/5/1997

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Represents in-kind distribution by Lightspeed Venture Partners VIII, L.P. ("Lightspeed VIII") without consideration to its partners (including LGP VIII, the general partner of Lightspeed VIII).
F10Lightspeed 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 Christopher J. Schaepe, Barry Eggers, Jeremy Liew, Ravi Mhatre, Peter Nieh and John Vrionis. Messrs. Schaepe, Eggers, Liew, Mhatre, Nieh and Vrionis disclaim their beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F11The shares are held of record by Lightspeed Select.
F12The shares are held of record by The Schaepe-Chiu Living Trust Dated November 5, 1997, for which Christopher J. Schaepe serves as co-trustee.
F2Lightspeed Ultimate General Partner VIII, Ltd. is the sole general partner of Lightspeed General Partner VIII, L.P. ("LGP VIII"), which is the sole general partner of Lightspeed VIII. The individual directors of Lightspeed Ultimate General Partner VIII, Ltd. are Christopher J. Schaepe, Barry Eggers, Ravi Mhatre and Peter Nieh. Messrs. Schaepe, Eggers, Mhatre, and Nieh disclaim beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F3The shares are held of record by Lightspeed VIII.
F4The shares are held of record by LGP VIII.
F5Represents in-kind distribution by LGP VIII without consideration to its partners (including Messrs. Schaepe, Eggers, Mhatre, and Nieh).
F6The shares are held of record by Eggers Investments LP - Fund I. Barry Eggers serves as trustee of the general partner of such entity.
F7The shares are held of record by Nieh Family Investments LP - Fund I. Peter Nieh serves as co-trustee of the general partner of such entity.
F8The shares are held of record by Schaepe-Chiu Investments I LP - Fund 1. Christopher J. Schaepe serves as co-trustee of the general partner of such entity.
F9These sales were executed in multiple trades at prices ranging from $17.50 to $18.23. The price reported above reflects the weighted average sale price. Mr. Eggers hereby undertakes to provide full information regarding the number of shares and prices at which these sales were effected, upon request, to the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer.

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.