X0609 4 2026-05-11 0 0001443669 Proto Labs Inc PRLB 0001870293 Kenison Michael R. false 5540 PIONEER CREEK DRIVE MAPLE PLAIN MN 55359 0 1 0 0 Chief Operations Officer 1 Common Stock 2026-05-11 4 M 0 3756 33.84 A 30942 D Common Stock 2026-05-11 4 M 0 3677 33.52 A 34619 D Common Stock 2026-05-11 4 S 0 7433 70.2612 D 27186 D Common Stock 2026-05-12 4 M 0 1928 33.84 A 29114 D Common Stock 2026-05-12 4 M 0 1557 39.61 A 30671 D Common Stock 2026-05-12 4 M 0 4042 59.40 A 34713 D Common Stock 2026-05-12 4 S 0 1613 67.5807 D 33100 D Common Stock 2026-05-12 4 S 0 4198 68.6971 D 28902 D Common Stock 2026-05-12 4 S 0 3576 69.7823 D 25326 D Common Stock 2026-05-12 4 S 0 6643 70.2958 D 18683 D Employee Stock Option (right to buy) 33.84 2026-05-11 4 M 0 3756 0 D 2033-02-14 Common Stock 3756 3856 D Employee Stock Option (right to buy) 33.52 2026-05-11 4 M 0 3677 0 D 2034-02-13 Common Stock 3677 3778 D Employee Stock Option (right to buy) 33.84 2026-05-12 4 M 0 1928 0 D 2033-02-14 Common Stock 1928 1928 D Employee Stock Option (right to buy) 39.61 2026-05-12 4 M 0 1557 0 D 2035-02-25 Common Stock 1557 4674 D Employee Stock Option (right to buy) 59.40 2026-05-12 4 M 0 4042 0 D 2032-02-13 Common Stock 4042 0 D These shares were acquired and sold pursuant to Reporting Person's 10b5-1 plan adopted August 15, 2025. Reflects the weighted average price of 7,433 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 11, 2026, with sale prices ranging from $70.00 to $70.57 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Reflects the weighted average price of 1,613 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $67.06 to $68.05 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Reflects the weighted average price of 4,198 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $68.10 to $69.0425 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Reflects the weighted average price of 3,576 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $69.13 to $70.1181 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Reflects the weighted average price of 6,643 shares of common stock of Proto Labs Inc. sold by the reporting person in multiple transactions on May 12, 2026, with sale prices ranging from $70.13 to $70.57 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. 25% of shares subject to the award will vest on February 13, 2024, and on each February 13th thereafter until all shares subject to the award are fully vested. 25% of shares subject to the award will vest on February 13, 2025, and on each February 13th thereafter until all shares subject to the award are fully vested. 25% of shares subject to the award will vest on February 25, 2026, and on each February 25th thereafter until all shares subject to the award are fully vested. 25% of shares subject to the award will vest on February 13, 2023, and on each February 13th thereafter until all shares subject to the award are fully vested. /s/ W. Morgan Burns, Attorney-in-Fact 2026-05-13