X0508 4 2024-04-01 0001600641 1stdibs.com, Inc. DIBS 0001305473 Insight Holdings Group, LLC C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001745334 Insight Venture Associates IX, L.P. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001745335 Insight Venture Associates IX, Ltd. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001629399 Insight Venture Partners (Cayman) IX, L.P. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001629396 Insight Venture Partners (Delaware) IX, L.P. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001629402 Insight Venture Partners IX (Co-Investors), L.P. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true 0001629398 Insight Venture Partners IX, L.P. C/O INSIGHT PARTNERS 1114 AVENUE OF THE AMERICAS, 36TH FLOOR NEW YORK NY 10036 true false Common Stock 2024-04-01 4 S 0 3960 6.0053 D 2592873 I See footnote Common Stock 2024-04-01 4 S 0 1968 6.0053 D 1288333 I See footnote Common Stock 2024-04-01 4 S 0 420 6.0053 D 274714 I See footnote Common Stock 2024-04-01 4 S 0 79 6.0053 D 51755 I See footnote Common Stock 2024-04-02 4 S 0 6615 6.0211 D 2586258 I See footnote Common Stock 2024-04-02 4 S 0 3287 6.0211 D 1285046 I See footnote Common Stock 2024-04-02 4 S 0 701 6.0211 D 274013 I See footnote Common Stock 2024-04-02 4 S 0 132 6.0211 D 51623 I See footnote Common Stock 2024-04-03 4 S 0 2053 6.0029 D 2584205 I See footnote Common Stock 2024-04-03 4 S 0 1021 6.0029 D 1284025 I See footnote Common Stock 2024-04-03 4 S 0 218 6.0029 D 273795 I See footnote Common Stock 2024-04-03 4 S 0 41 6.0029 D 51582 I See footnote See Exhibit 99.1 See Exhibit 99.1 See Exhibit 99.1 See Exhibit 99.1 See Exhibit 99.1 See Exhibit 99.1 See Exhibit 99.1 Exhibit List Exhibit 99.1 - Explanation of Responses Exhibit 99.2 - Joint Filers' Signatures Exhibit 99.3 - Joint Filer Information Insight Holdings Group, LLC, by Andrew Prodromos, its Authorized Signatory; By: /s/Andrew Prodromos 2024-04-03