X0306 4 2022-02-15 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 2022-02-15 4 A 0 3788 0 A 7221 D Employee Stock Option (right to buy) 59.40 2022-02-15 4 A 0 4042 0 A 2032-02-13 Common Stock 4042 4042 D Performance Stock Units 2022-02-15 4 A 0 1894 0 A 2024-12-31 Common Stock 1894 1894 D Restricted Stock Units that vest as follows: 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. Reports the total number of shares of Common Stock of the issuer held by the reporting person including 95 shares purchased on November 15, 2021 through the issuer's Employee Stock Purchase Plan program. 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. 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. /s/ W. Morgan Burns, Attorney-in-Fact 2022-02-17