Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Class A Common Stock^F7,F1,F2	Feb 28, 2018	S$0	7,100	—	D	169,043	D
Class A Common Stock^F8,F1,F2	Feb 28, 2018	S$0	9,325	—	D	159,718	D
Class A Common Stock^F9,F1,F2	Feb 28, 2018	S$0	21,975	—	D	137,743	D
Class A Common Stock^F10,F1,F2	Feb 28, 2018	S$0	1,572	—	D	136,171	D
Class A Common Stock^F7,F3,F4	Feb 28, 2018	S$0	7,100	—	D	169,043	D
Class A Common Stock^F8,F3,F4	Feb 28, 2018	S$0	9,325	—	D	159,718	D
Class A Common Stock^F9,F3,F4	Feb 28, 2018	S$0	21,975	—	D	137,743	D
Class A Common Stock^F10,F3,F4	Feb 28, 2018	S$0	1,572	—	D	136,171	D
Class A Common Stock^F7,F5,F6	Feb 28, 2018	S$0	14,200	—	D	338,085	D
Class A Common Stock^F8,F5,F6	Feb 28, 2018	S$0	18,650	—	D	319,435	D
Class A Common Stock^F9,F5,F6	Feb 28, 2018	S$0	43,950	—	D	275,485	D
Class A Common Stock^F10,F5,F6	Feb 28, 2018	S$0	3,144	—	D	272,341	D
Class A Common Stock^F11,F1,F2	Mar 1, 2018	S$0	18,938	—	D	117,233	D
Class A Common Stock^F12,F1,F2	Mar 1, 2018	S$0	2,340	—	D	114,893	D
Class A Common Stock^F11,F3,F4	Mar 1, 2018	S$0	18,938	—	D	117,233	D
Class A Common Stock^F12,F3,F4	Mar 1, 2018	S$0	2,340	—	D	114,893	D
Class A Common Stock^F11,F5,F6	Mar 1, 2018	S$0	37,873	—	D	234,468	D
Class A Common Stock^F12,F5,F6	Mar 1, 2018	S$0	4,683	—	D	229,785	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1These securities are owned solely by HarbourVest Partners VIII-Venture Fund, L.P. ("HV Ventures"). HarbourVest Partners, LLC is the managing member of HarbourVest VIII-Venture Associates LLC, which is the general partner of HarbourVest VIII-Venture Associates L.P., which is the general partner of HV Ventures. Each of HarbourVest Partners, LLC, HarbourVest VIII-Venture Associates LLC and HarbourVest VIII-Venture Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Ventures and each disclaims beneficial ownership of the securities held by HV Ventures, except to the extent of its pecuniary interest which is subject to indeterminable future events.
F10This transaction was executed in multiple trades at prices ranging from $78.5801 to $78.86 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.
F11This transaction was executed in multiple trades at prices ranging from $77.50 to $78.4901 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.
F12This transaction was executed in multiple trades at prices ranging from $78.54 to $79.35 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.
F2Each of HV Co-Invest (as defined below), HIPEP VI Select Associates LLC, HIPEP VI Select Associates L.P., HV Direct (as defined below), HarbourVest 2007 Direct Associates LLC, HarbourVest 2007 Direct Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P,. disclaims beneficial ownership of the securities held by HV Ventures and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.
F3These securities are owned solely by HarbourVest/NYSTRS Co-Invest Fund L.P. ("HV Co-Invest"). HarbourVest Partners, LLC is the managing member of HIPEP VI Select Associates LLC, which is the general partner of HIPEP VI Select Associates L.P., which is the general partner of HV Co-Invest. Each of HarbourVest Partners, LLC, HIPEP VI Select Associates LLC and HIPEP VI Select Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Co-Invest and each disclaims beneficial ownership of the securities held by HV Co-Invest, except to the extent of its pecuniary interest which is subject to indeterminable future events.
F4Each of HV Ventures, HarbourVest VIII-Venture Associates LLC, HarbourVest VIII-Venture Associates L.P., HV Direct, HarbourVest 2007 Direct Associates LLC, HarbourVest 2007 Direct Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P disclaims beneficial ownership of the securities held by HV Co-Invest and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.
F5These securities are owned solely by HarbourVest Partners 2007 Direct Fund L.P. ("HV Direct"). HarbourVest Partners, LLC is the managing member of HarbourVest 2007 Direct Associates LLC, which is the general partner of HarbourVest 2007 Direct Associates L.P., which is the general partner of HV Direct. Each of HarbourVest Partners, LLC, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. may be deemed to have a beneficial interest in the securities held by HV Direct and each disclaims beneficial ownership of the securities held by HV Direct, except to the extent of its pecuniary interest which is subject to indeterminable future events.
F6Each of HV Co-Invest, HIPEP VI Select Associates LLC, HIPEP VI Select Associates L.P., HV Ventures, HarbourVest VIII-Venture Associates LLC, HarbourVest VIII-Venture Associates L.P., HV9 (as defined below), HarbourVest IX-Venture Associates LLC, and HarbourVest IX-Venture Associates L.P disclaims beneficial ownership of the securities held by HV Direct and this report shall not be deemed an admission that any such reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act or for any other purpose.
F7This transaction was executed in multiple trades at prices ranging from $75.5001 to $76.5001 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.
F8This transaction was executed in multiple trades at prices ranging from $76.52 to $77.52 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.
F9This transaction was executed in multiple trades at prices ranging from $77.56 to $78.56 per share inclusive. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected.

Remarks

The reporting persons beneficially own less than 10% of the Issuer's Class A Common Stock, which is the class of equity securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). This Form 4 is being filed as a precautionary measure because Ian Lane, a Managing Director of HarbourVest Partners LLC, serves as a member of the board of directors of the Issuer. The filing of this Form shall not be deemed an admission that the reporting persons are required to file reports pursuant to Section 16 of the Exchange Act.