X0609 4 2026-05-19 0 0001443669 Proto Labs Inc PRLB 0001395001 Chin Moonhie false 5540 PIONEER CREEK DRIVE MAPLE PLAIN MN 55359 1 0 0 0 0 Common Stock 2026-05-19 4 A 0 2210 0 A 22306 D Deferred stock units that vest in full on the earlier of the first anniversary of the grant date or the date of the 2027 Annual Meeting of Shareholders but must be retained until the reporting person's service on the Company's Board of Directors ends. /s/ W. Morgan Burns, Attorney-in-Fact 2026-05-21