X0306 4 2021-07-20 0 0001657573 Xometry, Inc. XMTR 0001275810 HORNIG GEORGE 7529 STANDISH PLACE SUITE 200 DERWOOD MD 20855 1 0 0 0 Class A Common Stock 2021-07-20 4 A 0 644 A 128569 D Represents a restricted stock unit ("RSU") grant. The shares underlying the RSUs vest in two equal quarterly installments with the first installment vesting on October 1, 2021 and the second installment vesting on January 1, 2022, subject to the Reporting Person's continuous service. Each RSU represents a contingent right to receive one share of the Class A Common Stock of the Issuer. /s/ Dorothy Vinsky, Attorney-in-Fact 2021-07-22