X0407 4 2023-05-17 0001443669 Proto Labs Inc PRLB 0001205069 WEHRWEIN SVEN 5540 PIONEER CREEK DRIVE MAPLE PLAIN MN 55359 1 0 Common Stock 2023-05-17 4 A 0 4513 0 A 23655 D Deferred stock units that vest in full on the earlier of the first anniversary of the grant date or the date of the 2024 annual meeting of shareholders of Proto Labs, Inc. (the "Company"), but must be retained by the reporting person until the completion of the reporting person's service on the Company's Board of Directors. /s/ W. Morgan Burns, Attorney-in-Fact 2023-05-19