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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 (3) and (4) to this Form 4."}],"balance_after":439430,"source":{"system":"sec-edgar","filing":"0001869814-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000004/primarydocument.xml","form_type":"4"}},{"id":846411,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-03-12T21:05:49.000Z","date":"2026-03-10","kind":"grant","planned":false,"acquired":true,"shares":67816,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") grant. One quarter (1/4) of the shares underlying the RSUs will vest on January 1, 2027 and the remainder of the shares underlying the RSUs vest quarterly for the 3 years thereafter, subject to the Reporting Person's continuous service."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each RSU represents a contingent right to receive one share of the Class A Common Stock of the Issuer."}],"balance_after":440193,"source":{"system":"sec-edgar","filing":"0001869814-26-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000003/primarydocument.xml","form_type":"4"}},{"id":879879,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-02-27T00:21:53.000Z","date":"2026-02-26","kind":"sale","planned":true,"acquired":false,"shares":8372,"price":44.2825,"value":370733.09,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"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."},{"field":"kind","element":"transactionCoding","label":"F8","text":"These shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported in Column 4 is a weighted average price. 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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."}],"balance_after":402116,"source":{"system":"sec-edgar","filing":"0001869814-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000002/primarydocument.xml","form_type":"4"}},{"id":879875,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-02-27T00:21:53.000Z","date":"2026-02-24","kind":"grant","planned":true,"acquired":true,"shares":108860,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":404305,"source":{"system":"sec-edgar","filing":"0001869814-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000002/primarydocument.xml","form_type":"4"}},{"id":947099,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-01-06T21:54:21.000Z","date":"2026-01-05","kind":"sale","planned":true,"acquired":false,"shares":2924,"price":67.6935,"value":197935.794,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"These shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $65.36 to $66.24, inclusive."}],"balance_after":307205,"source":{"system":"sec-edgar","filing":"0001869814-26-000001","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000001/primarydocument.xml","form_type":"4"}},{"id":947096,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-01-06T21:54:21.000Z","date":"2026-01-05","kind":"sale","planned":true,"acquired":false,"shares":1315,"price":64.3801,"value":84659.8315,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"These shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.005 to $65.00, inclusive."}],"balance_after":308030,"source":{"system":"sec-edgar","filing":"0001869814-26-000001","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000001/primarydocument.xml","form_type":"4"}},{"id":947095,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2026-01-06T21:54:21.000Z","date":"2026-01-05","kind":"sale","planned":true,"acquired":false,"shares":926,"price":63.3219,"value":58636.0794,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"These shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.945 to $63.79, 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 (3), (4), (5), (6) and (7) to this Form 4."}],"balance_after":309345,"source":{"system":"sec-edgar","filing":"0001869814-26-000001","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981426000001/primarydocument.xml","form_type":"4"}},{"id":998985,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-11-14T21:16:56.000Z","date":"2025-11-12","kind":"gift","planned":false,"acquired":false,"shares":40000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Held by spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares donated as a gift by the Reporting Person's spouse to a charitable donor advised fund."}],"balance_after":591270,"source":{"system":"sec-edgar","filing":"0001869814-25-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981425000004/primarydocument.xml","form_type":"4"}},{"id":1024832,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-10-03T20:39:28.000Z","date":"2025-10-02","kind":"sale","planned":true,"acquired":false,"shares":27,"price":52.45,"value":1416.15,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"A portion of these shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."}],"balance_after":310271,"source":{"system":"sec-edgar","filing":"0001869814-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981425000003/primarydocument.xml","form_type":"4"}},{"id":1024831,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-10-03T20:39:28.000Z","date":"2025-10-02","kind":"sale","planned":true,"acquired":false,"shares":1944,"price":51.3927,"value":99907.4088,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"A portion of these shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $51.08 to $51.80, inclusive."}],"balance_after":310298,"source":{"system":"sec-edgar","filing":"0001869814-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000186981425000003/primarydocument.xml","form_type":"4"}},{"id":1024830,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-10-03T20:39:28.000Z","date":"2025-10-02","kind":"sale","planned":true,"acquired":false,"shares":3825,"price":50.6853,"value":193871.2725,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"A portion of these shares were sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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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 (2), (3), (5), (6), (8), (9), (11), (13), (14), (16) and (17) to this Form 4."}],"balance_after":634035,"source":{"system":"sec-edgar","filing":"0001562180-23-000790","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1869814/000156218023000790/primarydocument.xml","form_type":"4"}},{"id":2068593,"issuer":{"id":1915,"kind":"organization","name":"Xometry, Inc.","symbol":"XMTR"},"owners":[{"id":1916,"kind":"person","name":"Altschuler Randolph","position":1,"cik":"0001869814","reported_name":"Altschuler Randolph","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2023-01-04T22:11:19.000Z","date":"2023-01-03","kind":"sale","acquired":false,"shares":2000,"price":32.1154,"value":64230.8,"ownership":{"direct":false,"nature":"Held by The Sasha Sladkin Altschuler 2012 Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","text":"Represents shares sold in a transaction that was effected automatically pursuant to a Rule 10b-5 trading plan adopted by The Sasha Sladkin Altschuler 2012 Trust at least 30 days prior to the trading date."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is a weighted average price. 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