Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F2,F3	Jan 11, 2016	J	4,459,695	$0.00	D	4,459,702	D
Common Stock^F3,F4	Jan 11, 2016	J	385,460	$0.00	D	385,466	I	By Accel X Strategic Partners L.P.
Common Stock^F3,F5	Jan 11, 2016	J	469,069	$0.00	D	469,078	I	By Accel Investors 2008 L.L.C.
Common Stock^F3,F6	Jan 11, 2016	J	965,587	$0.00	D	965,593	I	By Accel Growth Fund II L.P.
Common Stock^F3,F7	Jan 11, 2016	J	69,938	$0.00	D	69,943	I	By Accel Growth Fund II Strategic Partners L.P.
Common Stock^F3,F8	Jan 11, 2016	J	94,001	$0.00	D	94,006	I	By Accel Growth Fund Investors 2012 L.L.C.
Common Stock^F3,F9	Jan 11, 2016	J	1,448,364	$0.00	D	1,448,380	I	By Accel London II L.P.
Common Stock^F3,F10	Jan 11, 2016	J	48,925	$0.00	D	48,933	I	By Accel London Investors 2008 L.P.

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Transactions reported on this form represent pro rata distributions, and not a purchase or sale of securities, by Accel X L.P., Accel X Strategic Partners L.P., Accel Investors 2008 L.L.C., Accel Growth Fund II L.P., Accel Growth Fund II Strategic Partners L.P., Accel Growth Fund Investors 2012 L.L.C., Accel London II L.P. and Accel London Investors 2008 L.P., to their respective general and limited partners or members without consideration. Distribution transactions were executed pursuant to a plan established in compliance with the requirements of Rule 10b5-1.
F10ALA L.L.C. is the General Partner of Accel London Investors 2008 L.P. and has the sole voting and investment power. Jonathan Biggs, Kevin Comolli, Bruce Golden and Hendrik Nelis are the managers of ALA L.L.C. and share such powers.
F2Accel X Associates L.L.C. ("A10A") is the General Partner of Accel X L.P. ("A10") and has the sole voting and investment power. Andrew G. Braccia, James W. Breyer, a director of the Issuer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock and Richard P. Wong are the Managing Members of A10A and share such powers.
F3Each Managing Member or Manager disclaims beneficial ownership except to the extent of his or her pecuniary interest therein.
F4A10A is the General Partner of Accel X Strategic Partners L.P. ("A10SP") and has the sole voting and investment power. Andrew G. Braccia, James W. Breyer, a director of the Issuer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock and Richard P. Wong are the Managing Members of A10A and share such powers.
F5Andrew G. Braccia, James W. Breyer, a director of the Issuer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock and Richard P. Wong are the Managing Members of Accel Investors 2008 L.L.C. and therefore share the voting and investment powers.
F6Accel Growth Fund II Associates L.L.C. ("AGFA") is the General Partner of Accel Growth Fund II L.P. ("AGF") and has the sole voting and investment power. Andrew G. Braccia, James W. Breyer, a director of the Issuer, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan J. Sweeney and Richard P. Wong are the Managing Members of AGFA and share such powers.
F7AGFA is the General Partner of Accel Growth Fund II Strategic Partners L.P. ("AGFSP") and has the sole voting and investment power. Andrew G. Braccia, James W. Breyer, a director of the Issuer, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan J. Sweeney and Richard P. Wong are the Managing Members of AGFA and share such powers.
F8Andrew G. Braccia, James W. Breyer, a director of the Issuer, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan J. Sweeney and Richard P. Wong are the Managing Members of Accel Growth Fund Investors 2012 L.L.C. and therefore share the voting and investment powers.
F9Accel London II Associates L.L.C. ("ALA L.L.C.") is the General Partner of Accel London II Associates L.P., which is the general partner of Accel London II L.P. ALA L.L.C. has the sole voting and investment power. Jonathan Biggs, Kevin Comolli, Bruce Golden and Hendrik Nelis are the managers of ALA L.L.C. and share such powers.