X0306 4 2017-01-20 0 0000785786 PLEXUS CORP PLXS 0001411282 Kelsey Todd P. ONE PLEXUS WAY NEENAH WI 54956 0 1 0 0 President & CEO Common Stock, $.01 par value 2017-01-20 4 M 0 14000 A 56162 D Common Stock, $.01 par value 2017-01-20 4 F 0 4930 52.95 D 51232 D Common Stock, $.01 par value 2017-01-23 4 M 0 4000 27.143 A 55232 D Common Stock, $.01 par value 2017-01-23 4 M 0 2000 27.86 A 57232 D Common Stock, $.01 par value 2017-01-23 4 S 0 6000 53.3567 D 51232 D Common Stock, $.01 par value 2017-01-24 4 M 0 5500 27.86 A 56732 D Common Stock, $.01 par value 2017-01-24 4 M 0 100 30.19 A 56832 D Common Stock, $.01 par value 2017-01-24 4 S 0 5600 53.6802 D 51232 D Restricted Stock Units 2017-01-20 4 M 0 14000 D Common Stock 14000 0 D Restricted Stock Units 2017-01-23 4 A 0 29630 A Common Stock 29630 29630 D Performance Stock Units 2017-01-23 4 A 0 25090 A Common Stock 25090 25090 D Options to Buy 27.143 2017-01-23 4 M 0 4000 0.00 D 2021-01-24 Common Stock 4000 0 D Options to Buy 27.86 2017-01-23 4 M 0 2000 0.00 D 2022-07-23 Common Stock 2000 5500 D Options to Buy 27.86 2017-01-24 4 M 0 5500 0.00 D 2022-07-23 Common Stock 5500 0 D Options to Buy 30.19 2017-01-24 4 M 0 100 0.00 D 2021-07-25 Common Stock 100 6125 D Each Restricted Stock Unit granted under the Plexus Corp. 2008 Long-Term Incentive Plan, which qualifies under Rule 16b-3, represented a contingent right to receive one share of Plexus Corp. common stock. The Restricted Stock Units vested and settled on January 20, 2017. This transaction was executed in multiple trades at prices ranging from $53.25 to $53.48 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 $53.49 to $54.19 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. Each Restricted Stock Unit granted under the Plexus Corp. 2016 Omnibus Incentive Plan, which qualifies under Rule 16b-3, represents a contingent right to receive one share of Plexus Corp. common stock. The Restricted Stock Units vest on January 23, 2020. Each Performance Stock Unit ("PSU") granted under the Plexus Corp. 2016 Omnibus Incentive Plan, which qualifies under Rule 16b-3, represents a contingent right to receive one share of Plexus Corp. common stock if certain conditions are satisfied. Vesting of the PSUs is dependent on the relative total shareholder return ("TSR") of Plexus Corp.'s common stock as compared to companies in the Russell 3000 Index and on goals related to economic return during the three-year performance period. The target number of PSUs that may be earned is reported above; the maximum amount is 200% of the number reported. Options granted under the Plexus Corp. 2008 Long-Term Incentive Plan, or a predecessor plan, which qualifies under Rule 16b-3; now fully vested. Todd P. Kelsey, by Kate A. Gitter, Attorney-in-Fact 2017-01-24