X0306 4/A 2022-05-18 2022-05-20 0001443669 Proto Labs Inc PRLB 0001542473 Gawlick Rainer 5540 PIONEER CREEK DRIVE MAPLE PLAIN MN 55359 1 Common Stock 25779 D On May 20, 2022, the reporting person mistakenly filed a Form 4 reporting a grant of 3,236 shares of deferred stock units that did not in fact occur. The May 20, 2022 Form 4 is, accordingly, withdrawn. As of May 18, 2022, the reporting person owned only 25,779 shares of common stock. /s/ W. Morgan Burns, Attorney-in-Fact 2022-06-10