X0306 4 2021-11-17 0 0000785786 PLEXUS CORP PLXS 0001600425 Darroch Ronnie ONE PLEXUS WAY NEENAH WI 54956 0 1 0 0 Exec VP & Reg Pres-EMEA Common Stock, $.01 par value 2021-11-17 4 M 0 6140 A 11196 D Common Stock, $.01 par value 2021-11-17 4 F 0 2922 92.42 D 8274 D Common Stock, $.01 par value 2021-11-18 4 S 0 2674 91.9768 D 5600 D Performance Stock Units 2021-11-17 4 A 0 3070 A Common Stock 3070 8400 D Performance Stock Units 2021-11-17 4 M 0 6140 D Common Stock 6140 2260 D Based on Company performance during the three-year performance period, 200% of the portion of the Performance Stock Units ("PSUs") granted in fiscal 2019 related to economic return goals vested. The three-year performance period for the portion of the PSUs that vests based on the relative total shareholder return ("TSR") of the Company's common stock as compared to companies in the Russell 3000 Index has yet to conclude. As previously disclosed, the reporting person has the opportunity to earn up to 200% of the number of PSUs originally reported. This transaction was executed in multiple trades at prices ranging from $91.657 to $92.16 per share. The reported price reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Ronald Darroch, by Kate A. Gitter, Attorney-in-Fact 2021-11-19