Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1	Nov 6, 2017	C	3,141,565	$0.00	A	3,141,565	I	See Footnote
Class A Common Stock^F2	Nov 6, 2017	C	54,871	$0.00	A	54,871	I	See Footnote
Class A Common Stock^F3,F1	Nov 7, 2017	S	1,435,365	$3.2563	D	1,706,200	I	See Footnote
Class A Common Stock^F3,F2	Nov 7, 2017	S	25,070	$3.2563	D	29,801	I	See Footnote

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,F4	—	Nov 6, 2017	C	3,141,565	D	—	—	Class A Common Stock	3,141,565	12,566,261	I
Class B Common Stock^F2,F4	—	Nov 6, 2017	C	54,871	D	—	—	Class A Common Stock	54,871	219,482	I

Explanation of responses

F1The reported shares are directly owned by First Round Capital IV, L.P. ("FRC IV LP"). First Round Capital Management IV, L.P., the general partner of FRC IV LP, and First Round Capital Management IV, LLC, the general partner of First Round Capital Management IV, L.P., have sole dispositive and voting power of the shares directly owned by FRC IV LP, and Phineas Barnes, Christopher Fralic, Robert Hayes, Joshua Kopelman and William Trenchard may be deemed to have shared dispositive and voting power over such shares. Such persons and entities disclaim beneficial ownership over the shares held by FRC IV LP except to the extent of any pecuniary interest therein.
F2The reported shares are owned directly by First Round Capital IV Partners Fund, L.P. ("FRC IV Partners LP"). First Round Capital Management IV, L.P., the general partner of FRC IV Partners LP, and First Round Capital Management IV, LLC, the general partner of First Round Capital Management IV, L.P., have sole dispositive and voting power of the shares directly owned by FRC IV Partners LP, and Phineas Barnes, Christopher Fralic, Robert Hayes, Joshua Kopelman and William Trenchard may be deemed to have shared dispositive and voting power over such shares. Such persons and entities disclaim beneficial ownership over the shares held by FRC IV Partners LP except to the extent of any pecuniary interest therein.
F3The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.03 to $3.67, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote 3 to this Form 4.
F4The Class B Common Stock is convertible into the Issuer's Class A Common Stock on a one-for-one basis upon certain transfers of such shares and at the holder's election and has no expiration date.