X0306 4 2022-10-05 0 0001496963 Squarespace, Inc. SQSP 0001466950 Index Ventures Growth I (Jersey) L.P. 5TH FLOOR, 44 ESPLANADE ST. HELIER Y9 JE1 3FG JERSEY 0 0 1 0 0001447961 Index Venture Growth Associates I Ltd 44 ESPLANADE ST. HELIER Y9 JE1 3FG JERSEY 0 0 1 0 Class A Common Stock 2022-10-05 4 J 0 1852344 0.00 D 11114070 D Class A Common Stock 483933 I By Index Venture Growth Associates I Limited Class A Common Stock 452368 I By Index Ventures Growth I Parallel Entrepreneur Fund (Jersey), L.P. Class A Common Stock 67428 I By Yucca (Jersey) SLP On October 5, 2022, Index Ventures Growth I (Jersey) L.P. ("Index Growth I") distributed in-kind, without consideration, 1,852,344 shares of the Issuer's Class A Common Stock pro-rata to its limited partners and its general partner, Index Venture Growth Associates I Limited ("IVGA I"), in accordance with the exemptions under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended. The shares are held of record by Index Growth I. IVGA I is the managing general partner of Index Growth I. IVGA I disclaims beneficial ownership of such shares for purposes of Section 16 of the Securities Exchange Act of 1934 ("Section 16") except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose. The shares are held of record by IVGA I. The shares are held of record by Index Ventures Growth I Parallel Entrepreneur Fund (Jersey), L.P. ("Index Growth I Parallel"). IVGA I is the managing general partner of Index Growth I Parallel. IVGA I disclaims Section 16 beneficial ownership of such shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose. The shares are held of record by Yucca (Jersey) SLP ("Yucca"). Yucca is the administrator of the Index co-investment vehicles that are contractually required to mirror the relevant Index funds' investment (in this case, Index Growth I and Index Growth I Parallel). IVGA I disclaims Section 16 beneficial ownership of such shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose. Index Ventures Growth I (Jersey) L.P., By: Index Venture Growth Associates I Ltd, as General Partner, By: /s/ Nigel Greenwood, Director 2022-10-07 Index Venture Growth Associates I Ltd, as General Partner, By: /s/ Nigel Greenwood, Director 2022-10-07