Transaction Details

Footnotes

Represents restricted stock units ("RSU") that were granted in March 2025 subject to performance-based vesting conditions pertaining to 2025 performance, the achievement of which was certified by the Board on February 24, 2026. Of these RSUs, 1/3rd of the shares vested on February 24, 2026, and the remainder of the shares underlying the RSUs will vest in equal installments on each of February 24, 2027 and February 24, 2028, subject to the reporting person's continuous service. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.93 to $42.93, inclusive. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.94 to $43.93, inclusive. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.96 to $44.81, inclusive. | Held by the 2021 Tigers Trust, over which the Reporting Person may be deemed to exercise voting control. | Held by the Matthew Sladkin Altschuler 2012 Trust, over which the Reporting Person may be deemed to exercise voting control. | Held by the Sasha Sladkin Altschuler 2012 Trust, over which the Reporting Person may be deemed to exercise voting control. | Held by the Noah Sladkin Altschuler 2012 Trust, over which the Reporting Person may be deemed to exercise voting control. | Held by the Altschuler Family Trust (2020), over which the Reporting Person may be deemed to exercise voting control. | The transaction reported in this Form 4 was effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person at least 90 days prior to the trading date. | These shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units. | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.905 to $41.88, inclusive. The reporting person undertakes to provide to Xometry, Inc., any security holder of Xometry, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price in the ranges set forth in footnotes (9), (10), (11) and (12) to this Form 4.