PLEXUS GROUP

maximum of 15 % of their annual compensation. Participants who have attained age 50 before the end of the Plan year are eligible to make catch-up contributions. The discretionary Company matching contribution will be determined on an annual basis; however, on a per pay period basis, the Company makes a matching contribution on behalf of each eligible participant equal to 100 % of the first 4 % of the participant’s compensation contributed to the Plan. Participants are eligible for the matching contribution immediately following their date of hire. Contributions are limited by Section 415(c) of the Internal Revenue Code (the “IRC”). The Plan permits rollover contributions from other qualified plans; however, rollover contributions are not eligible for the Company matching contribution. Inv

ts hired on or before January 1, 2024 immediately vest in all contributions made to the Plan. For participants hired after January 1, 2024, participant contributions are fully and immediately vested, and the Company matching contribution is fully vested on a three-year cliff schedule. Participant accounts are distributable, in full or as partial withdrawals, in the form of a lump sum payment or substantially equal installments of cash or in whole shares of Company securities as elected by the participant upon retirement, termination of employment, death, disability, financial hardship, attainment of age 59-1/2, victim of domestic abuse, or if a qualified reservist is called to active military duty. Participant account balances of less than $ 7,000 are automatically distributed in a single

may elect to defer up to 75 % of their eligible compensation contributed as pre-tax 401(k), Roth, or after-tax contributions to the Plan. New hires and rehires are subject to the automatic enrollment provisions under the Plan. Unless the new hire/rehire waives enrollment, employees are enrolled with a 4 % deferral election, and the deferral election will increase 1 % each year up to a maximum of 15 % of their annual compensation. Participants who have attained age 50 before the end of the Plan year are eligible to make catch-up contributions. The discretionary Company matching contribution will be determined on an annual basis; however, on a per pay period basis, the Company makes a matching contribution on behalf of each eligible participant equal to 100 % of the first 4 % of the partici

9,895 Participant rollovers 2,401,686 Total contributions 36,182,771 Total additions to net assets 126,330,532 Deductions from net assets: Benefits paid to participants 63,647,206 Administrative expenses 423,557 Total deductions from net assets 64,070,763 Net increase during the year 62,259,769 Net assets available for benefits Beginning of year 606,090,256 End of year $ 668,350,025 The accompanying notes are an integral part of this financial statements. 4 Plexus Corp. 401(k) Retirement Plan Notes to Financial Statements December 31, 2025 and 2024 1. Description of Plan The following description of the Plexus Corp. 401(k) Retirement Plan (the “Plan”) provides only general information. Participants should refer to the Plan document for a more complete description of the Plan’s provisions.