X0508 4 2024-03-19 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 2024-03-19 4 S 0 5394 6.0129 D 2805757 I See footnote Common Stock 2024-03-19 4 S 0 2680 6.0129 D 1394109 I See footnote Common Stock 2024-03-19 4 S 0 572 6.0129 D 297268 I See footnote Common Stock 2024-03-19 4 S 0 108 6.0129 D 56004 I See footnote Common Stock 2024-03-20 4 S 0 35760 6.024 D 2769997 I See footnote Common Stock 2024-03-20 4 S 0 17769 6.024 D 1376340 I See footnote Common Stock 2024-03-20 4 S 0 3789 6.024 D 293479 I See footnote Common Stock 2024-03-20 4 S 0 714 6.024 D 55290 I See footnote Common Stock 2024-03-21 4 S 0 19841 6.0381 D 2750156 I See footnote Common Stock 2024-03-21 4 S 0 9858 6.0381 D 1366482 I See footnote Common Stock 2024-03-21 4 S 0 2102 6.0381 D 291377 I See footnote Common Stock 2024-03-21 4 S 0 396 6.0381 D 54894 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 2024-03-21