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SEC source: 0000899243-17-014377 · doc4.xml · nonDerivative · entry 1

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 680,365

F9 · price: This transaction was executed in multiple trades at prices ranging from $63.60 to $64.13 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0000899243-17-014375 · doc4.xml · nonDerivative · entry 4

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,944

F9 · price: This transaction was executed in multiple trades at prices ranging from $63.60 to $64.13 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014375 · doc4.xml · nonDerivative · entry 3

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,014,545

F9 · price: This transaction was executed in multiple trades at prices ranging from $63.60 to $64.13 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014375 · doc4.xml · nonDerivative · entry 2

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 507,272

F9 · price: This transaction was executed in multiple trades at prices ranging from $63.60 to $64.13 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014375 · doc4.xml · nonDerivative · entry 1

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 680,365

F9 · price: This transaction was executed in multiple trades at prices ranging from $63.60 to $64.13 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0001616707-17-000340 · wf-form4_149548783544410.xml · nonDerivative · entry 2

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,898

F2 · kind: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSUs listed in Table II and does not represent a discretionary trade by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.15, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 16

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,730

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 15

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,814

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 14

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,029,889

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 13

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,051,062

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 12

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 514,944

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 11

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 525,539

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 10

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 690,655

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 9

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 704,854

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 16

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,730

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 15

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,814

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 14

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,029,889

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 13

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,051,062

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 12

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 514,944

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 11

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 525,539

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 10

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 690,655

F12 · price: This transaction was executed in multiple trades at prices ranging from $63.28 to 63.96 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0000899243-17-014151 · doc4.xml · nonDerivative · entry 9

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES LLC · CIK 0001620785 · (see remarks)

HARBOURVEST PARTNERS 2007 DIRECT FUND L.P. · CIK 0001620787 · (see remarks)

HARBOURVEST PARTNERS LLC · CIK 0001201001 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES L.P. · CIK 0001620789 · (see remarks)

HARBOURVEST PARTNERS VIII-VENTURE ASSOCIATES LLC · CIK 0001620788 · (see remarks)

HarbourVest Partners VIII-Venture Fund L.P. · CIK 0001620790 · (see remarks)

HarbourVest Partners/NYSTRS Co-Investment Fund L.P. · CIK 0001620791 · (see remarks)

HIPEP VI Select Associates L.P. · CIK 0001620817 · (see remarks)

HIPEP VI Select Associates LLC · CIK 0001620816 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 704,854

F11 · price: This transaction was executed in multiple trades at prices ranging from $62.31 to $63.13 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.

F1 · ownership.direct: These 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.

F2 · ownership.direct: Each 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.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 10

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,031

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F12 · ownership.direct: These securities are owned by Great Hill Investors, LLC. Great Hill Investors, LLC is controlled by Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel and, as such, they may be deemed to indirectly beneficially own the shares beneficially owned by Great Hill Investors, LLC. Each of Messrs. Gaffney, Hayes, Kumin, Taber and Vettel disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 9

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By UBMB, LLC

Disclosed balance after: 25,707

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F11 · ownership.nature: UBMB, LLC is controlled by Christopher S. Gaffney and, as such, he may be deemed to indirectly beneficially own these securities. Mr. Gaffney disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 8

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Dakota Capital, LLC

Disclosed balance after: 20,704

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F10 · ownership.nature: Dakota Capital, LLC is controlled by Matthew T. Vettel and, as such, he may be deemed to indirectly beneficially own these securities. Mr. Vettel disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 7

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Blue Hill Capital, LLC

Disclosed balance after: 30,849

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F9 · ownership.nature: Blue Hill Capital, LLC is controlled by John G. Hayes and, as such, he may be deemed to indirectly beneficially own these securities. Mr. Hayes disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 6

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,992

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F8 · ownership.direct: These securities are owned by Matthew T. Vettel.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 5

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,728

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F7 · ownership.direct: These securities are owned by Mark D. Taber.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 4

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,401

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F6 · ownership.direct: These securities are owned by Michael A. Kumin.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 3

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,855

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F5 · ownership.direct: These securities are owned by John G. Hayes.

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 2

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,997

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F4 · ownership.direct: These securities are owned by Christopher S. Gaffney

SEC source: 0001104659-17-034934 · a4.xml · nonDerivative · entry 1

GREAT HILL EQUITY PARTNERS IV LP · CIK 0001437849 · 10% owner

GREAT HILL INVESTORS LLC · CIK 0001161866 · 10% owner

GHP IV, LLC · CIK 0001486581 · 10% owner

Great Hill Partners GP IV, L.P. · CIK 0001486578 · 10% owner

GAFFNEY CHRISTOPHER S · CIK 0001049250 · 10% owner

HAYES JOHN G · CIK 0001049251 · 10% owner

Kumin Michael Andrew · CIK 0001368414 · Director · 10% owner

Taber Mark D. · CIK 0001576430 · 10% owner

Vettel Matthew T · CIK 0001365655 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Great Hill Partners GP IV, L.P. made a pro rata distribution for no consideration of an aggregate of 223,390 shares of Class A Common Stock of Wayfair Inc. to its limited partners on May 22, 2017.

F2 · ownership.direct: This report is filed jointly by Great Hill Investors, LLC, Great Hill Equity Partners IV, L.P., GHP IV, LLC, Great Hill Partners GP IV, L.P., Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel.

F3 · ownership.direct: These securities are owned by Great Hill Partners GP IV, L.P. GHP IV, LLC is the sole general partner of Great Hill Partners GP IV, L.P. GHP IV, LLC is controlled by Christopher S. Gaffney, John G. Hayes, Michael A. Kumin, Mark D. Taber and Matthew T. Vettel and, as such, they may be deemed to indirectly beneficially own the shares beneficially owned by Great Hill Equity Partners IV, L.P. Each of Messrs. Gaffney, Hayes, Kumin, Taber and Vettel disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001616707-17-000346 · wf-form4_149565788111859.xml · nonDerivative · entry 3

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,419

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.00 to $64.00, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000346 · wf-form4_149565788111859.xml · nonDerivative · entry 2

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,819

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.99, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000346 · wf-form4_149565788111859.xml · nonDerivative · entry 1

Shah Niraj · CIK 0001620093 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,319

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.98 to $62.97, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000345 · wf-form4_149565786041831.xml · nonDerivative · entry 4

Conine Steven · CIK 0001620052 · Director · Co-Founder · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,375

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.62 to $64.02, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000345 · wf-form4_149565786041831.xml · nonDerivative · entry 3

Conine Steven · CIK 0001620052 · Director · Co-Founder · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,875

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.00 to $63.61, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000345 · wf-form4_149565786041831.xml · nonDerivative · entry 2

Conine Steven · CIK 0001620052 · Director · Co-Founder · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,275

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.99, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000345 · wf-form4_149565786041831.xml · nonDerivative · entry 1

Conine Steven · CIK 0001620052 · Director · Co-Founder · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,675

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.98 to $62.94, inclusive. The reporting person undertakes to provide to Wayfair Inc., any security holder of Wayfair Inc., 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 ranges set forth in this footnote.

SEC source: 0001616707-17-000347 · wf-form4_149565789832336.xml · nonDerivative · entry 1

Oblak Steve · CIK 0001620159 · SVP and GM, Wayfair.com

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,596

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001616707-17-000340 · wf-form4_149548783544410.xml · derivative · entry 5

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 9,467 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-17-000340 · wf-form4_149548783544410.xml · derivative · entry 4

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,467

Underlying: Class A Common Stock · 9,467 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0001616707-17-000340 · wf-form4_149548783544410.xml · derivative · entry 3

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 160,934

Underlying: Class B Common Stock · 9,467 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Class B Common Stock when vested.

F5 · derivative.exercise_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on October 21, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

F5 · derivative.expiration_date: These RSUs vest upon the satisfaction of a service condition and an event condition and have no expiration date. The service condition is satisfied as to 1/5th of the shares on October 21, 2014 and as to an additional 1/60th of the shares for each month of continuous service thereafter. The event condition was satisfied on the closing of the issuer's initial public offering of Class A Common Stock.

SEC source: 0001616707-17-000340 · wf-form4_149548783544410.xml · nonDerivative · entry 1

FLEISHER MICHAEL D · CIK 0001187596 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,532

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock (a) upon transfer thereof, subject to certain exceptions, (b) upon the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate number of shares of the then outstanding Class A Common Stock and Class B Common Stock, or (c) in the event that holders of at least 66 2/3% of the then outstanding shares of Class B Common Stock elect to convert all shares of Class B Common Stock into shares of Class A Common Stock.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 8

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,265

F10 · price: This transaction was executed in multiple trades at prices ranging from $63.01 to $63.58 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 7

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,667

F9 · price: This transaction was executed in multiple trades at prices ranging from $62.00 to $63.00 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.

F7 · ownership.direct: The securities are owned solely by HarbourVest Partners IX-Venture Fund L.P. ("HV9"). HarbourVest Partners LLC which is the Managing Member of HarbourVest IX-Venture Associates LLC, which is the general partner of HarbourVest IX-Venture Associates L.P. which is the general partner of HarbourVest Partners IX-Venture Fund L.P. may be deemed to have a beneficial interest in the securities held by HV9 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.

F8 · ownership.direct: Each 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., HV Direct, HarbourVest 2007 Direct Associates LLC and HarbourVest 2007 Direct Associates L.P. disclaims beneficial ownership of the securities held by HV9 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 6

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,079,399

F10 · price: This transaction was executed in multiple trades at prices ranging from $63.01 to $63.58 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 5

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,087,278

F9 · price: This transaction was executed in multiple trades at prices ranging from $62.00 to $63.00 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.

F5 · ownership.direct: These 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.

F6 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 4

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 539,699

F10 · price: This transaction was executed in multiple trades at prices ranging from $63.01 to $63.58 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.

SEC source: 0000899243-17-014152 · doc4.xml · nonDerivative · entry 3

HARBOURVEST PARTNERS 2007 DIRECT ASSOCIATES L.P. · CIK 0001620786 · See Remarks

HarbourVest Partners IX-Venture Fund L.P. · CIK 0001485992 · (see remarks)

HarbourVest IX-Venture Associates L.P. · CIK 0001659078 · (see remarks)

HarbourVest IX-Venture Associates LLC · CIK 0001659259 · (see remarks)

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 543,645

F9 · price: This transaction was executed in multiple trades at prices ranging from $62.00 to $63.00 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.

F3 · ownership.direct: These 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.

F4 · ownership.direct: Each 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.