Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1,F2,F3	Feb 27, 2017	C	10,352,222	—	A	10,352,222	I	By Lightspeed Venture Partners VII, L.P.
Class A Common Stock^F1,F4,F5	Mar 15, 2017	C	3,612,374	—	A	3,612,374	I	By Lightspeed Venture Partners VIII, L.P.
Class A Common Stock^F6,F2,F3	Mar 28, 2017	J	2,860,446	—	D	7,491,776	I	By Lightspeed Venture Partners VII, L.P.
Class A Common Stock^F6,F7,F3	Mar 28, 2017	J	736,566	—	A	736,566	I	By Lightspeed General Partner VII, L.P.
Class A Common Stock^F8,F7,F3	Mar 28, 2017	J	736,566	—	D	0	I	By Lightspeed General Partner VII, L.P.
Class A Common Stock^F8,F9	Mar 28, 2017	J	107,474	—	A	107,474	I	By Barry Eggers Revocable Trust dtd 6/4/2008
Class A Common Stock^F8	Mar 28, 2017	J	107,474	—	A	107,474	D
Class A Common Stock^F8,F11	Mar 28, 2017	J	107,474	—	A	107,474	I	By The Schaepe-Chiu Living Trust Dated 11/5/1997
Class A Common Stock^F12,F4,F5	Mar 28, 2017	J	1,430,223	—	D	2,182,151	I	By Lightspeed Venture Partners VIII, L.P.
Class A Common Stock^F12,F13,F5	Mar 28, 2017	J	332,886	—	A	332,886	I	By Lightspeed General Partner VIII, L.P.
Class A Common Stock^F14,F13,F5	Mar 28, 2017	J	332,886	—	D	0	I	By Lightspeed General Partner VIII, L.P.
Class A Common Stock^F14,F15	Mar 28, 2017	J	43,074	—	A	43,074	I	By Eggers Investments, L.P.
Class A Common Stock^F14,F10	Mar 28, 2017	J	43,074	—	A	43,074	I	By Nieh Family Investments LP - Fund 1
Class A Common Stock^F14,F16	Mar 28, 2017	J	43,074	—	A	43,074	I	By Schaepe-Chiu Investments I LP - Fund 1
Class A Common Stock^F17,F9	Mar 29, 2017	S	90,000	$18.6186	D	17,474	I	By Barry Eggers Revocable Trust dtd 6/4/2008
Class A Common Stock^F17,F15	Mar 29, 2017	S	43,074	$18.6186	D	0	I	By Eggers Investments, L.P.
Class A Common Stock^F18,F11	Mar 30, 2017	S	25,000	$19.0912	D	82,474	I	By The Schaepe-Chiu Living Trust Dated 11/5/1997

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	—	Feb 27, 2017	C	10,352,222	D	—	—	Class A Common Stock	10,352,222	0	I
Class B Common Stock^F1,F4,F5	—	Mar 15, 2017	C	3,612,374	D	—	—	Class A Common Stock	3,612,374	14,449,498	I
Class B Common Stock^F19,F20	—	holding	—	—	—	—	—	Class A Common Stock	190,363	190,363	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 Nieh Family Investments LP - Fund 1. Peter Nieh serves as co-trustee of the general partner of such entity.
F11The shares are held of record by The Schaepe-Chiu Living Trust Dated November 5, 1997, for which Christopher J. Schaepe serves as co-trustee.
F12Represents in-kind distribution by Lightspeed VIII without consideration to its partners (including LGP VIII, the general partner of Lightspeed VIII).
F13The shares are held of record by LGP VIII.
F14Represents in-kind distribution by LGP VIII without consideration to its partners (including Messrs. Schaepe, Eggers, Mhatre, and Nieh).
F15The shares are held of record by Eggers Investments, L.P. Barry Eggers serves as trustee of the general partner of such entity.
F16The 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.
F17These sales were executed in multiple trades at prices ranging from $18.23 to $18.94. 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.
F18These sales were executed in multiple trades at prices ranging from $19.06 to $19.135. The price reported above reflects the weighted average sale price. Mr. Schaepe 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.
F19The shares are held of record by Lightspeed Venture Partners Select, L.P. ("Lightspeed Select"). Lightspeed Ultimate General Partner Select, Ltd. is the sole general partner of Lightspeed General Partner Select, L.P., which is the sole general partner of 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, Mhatre, and Nieh disclaim their beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F2The shares are held of record by Lightspeed Venture Partners VII, L.P. ("Lightspeed VII").
F20Shares 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.
F3Lightspeed 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 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.
F4The shares are held of record by Lightspeed Venture Partners VIII, L.P. ("Lightspeed VIII").
F5Lightspeed 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 their beneficial ownership of the shares except to the extent of their pecuniary interest therein.
F6Represents in-kind distribution by Lightspeed VII without consideration to its partners (including LGP VII, the general partner of Lightspeed VII).
F7The shares are held of record by LGP VII.
F8Represents in-kind distribution by LGP VII without consideration to its partners (including Messrs. Schaepe, Eggers, Mhatre, and Nieh).
F9The shares are held of record by Barry Eggers Revocable Trust dtd 6/4/2008, for which Barry Eggers serves as trustee.

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.