X0306 4 2023-02-13 0001443669 Proto Labs Inc PRLB 0001870293 Kenison Michael R. 5540 PIONEER CREEK DRIVE MAPLE PLAIN MN 55359 1 VP and GM of the America's Common Stock 2023-02-13 4 F 0 340 34.23 D 6597 D Common Stock 2023-02-14 4 A 0 8127 0 A 14724 D Performance Stock Units 2023-02-14 4 A 0 4064 0 A 2025-12-31 Common Stock 4064 4064 D Employee Stock Option (right to buy) 33.84 2023-02-14 4 A 0 7712 0 A 2033-02-14 Common Stock 7712 7712 D Employee Stock Option (right to buy) 33.84 2023-02-14 4 A 0 3048 0 A 2026-02-14 Common Stock 3048 3048 D Includes 262 shares of Common Stock of the issuer purchased on November 15, 2022 through the issuer's Employee Stock Purchase Plan program. Restricted Stock Units that vest as follows: 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. Each performance stock unit represents a contingent right to receive one share of Proto Labs, Inc. common stock. The performance stock units vest upon Proto Labs, Inc. common stock achieving a specified price per share. 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. The stock option vests in full on February 13, 2024. /s/ W. Morgan Burns, Attorney-in-Fact 2023-02-15