X0306 4 2022-08-10 0 0000785786 PLEXUS CORP PLXS 0001411282 Kelsey Todd P. ONE PLEXUS WAY NEENAH WI 54956 1 1 0 0 CEO Common Stock, $.01 par value 10070 I 401(k) Common Stock, $.01 par value 2022-08-10 4 S 0 3000 94.9633 D 101528 D Common Stock, $.01 par value 2022-08-11 4 S 0 2624 95.6852 D 98904 D Common Stock, $.01 par value 2022-08-11 4 S 0 1000 96.00 D 21451 I By Family LLC Common Stock, $.01 par value 2022-08-12 4 S 0 2000 96.00 D 19451 I By Family LLC Common Stock, $.01 par value 2022-08-12 4 S 0 1000 96.41 D 97904 D Shares of Plexus Corp. common stock held in the Plexus Corp. 401(k) Retirement Plan as of the last report from the Plan's trustee. This transaction was executed in multiple trades at prices ranging from $94.79 to $95.11 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. This transaction was executed in multiple trades at prices ranging from $95.42 to $95.91 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. Shares were sold pursuant to a Rule 10b5-1 plan. Shares of Plexus Corp. common stock held in a family-owned entity controlled by the reporting person. Todd P. Kelsey, by Carena Koeppl, Attorney-in-Fact 2022-08-12