Other Events. On August 20, 2026, the Board of Directors of Plexus Corp. (the “Company”) approved a new share repurchase program that authorizes the Company to repurchase up to $100.0 million of its common stock beginning upon expiration of the Company’s current $100.0 million share repurchase program, which shall remain in effect until its expiration. As of August 19, 2026, the remaining balance on the current $100.0 million share repurchase program was $9.6 million. The Company does not hav…

Results of Operations and Financial Condition. On July 29, 2026, Plexus Corp. (“we” or the “Company”) announced results for the fiscal third quarter ended July 4, 2026. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Entry into a Material Definitive Agreement. On June 5, 2026, Plexus Corp. (the "Company") entered into a Second Amended and Restated Credit Agreement (the "Second Amended and Restated Credit Agreement") by and among the Company, certain of its subsidiaries from time to time party thereto as borrowers (together with the Company, collectively, the “Borrowers”), the lenders from time to time party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent (the “Administrative Agent”), which…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. Incorporated herein by reference to

Chief Financial Officer — Patrick J. Jermain: Patrick J. Jermain is retiring as CFO, with David Abuhl succeeding him.

Results of Operations and Financial Condition. On April 29, 2026, Plexus Corp. (“we” or the “Company”) announced results for the fiscal second quarter ended April 4, 2026. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Results of Operations and Financial Condition. On January 28, 2026, Plexus Corp. (“we” or the “Company”) announced results for the fiscal first quarter ended January 3, 2026. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Results of Operations and Financial Condition. On October 22, 2025, Plexus Corp. (“we” or the “Company”) announced results for the fiscal fourth quarter and year ended September 27, 2025. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Results of Operations and Financial Condition. On July 23, 2025, Plexus Corp. (“we” or the “Company”) announced results for the fiscal third quarter ended June 28, 2025. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Other Events. On May 14, 2025 the Board of Directors of Plexus Corp. (the “Company”) approved a new share repurchase program that authorizes the Company to repurchase up to $100.0 million of its common stock beginning upon expiration of the Company’s current $50.0 million share repurchase program, which shall remain in effect until its expiration. As of May 13, 2025, the remaining balance on the current $50.0 million share repurchase program was $17.9 million. The Company does not have a spec…

Results of Operations and Financial Condition. On April 23, 2025, Plexus Corp. (“we” or the “Company”) announced results for the fiscal second quarter ended March 29, 2025. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Results of Operations and Financial Condition. On January 22, 2025, Plexus Corp. (“we” or the “Company”) announced results for the fiscal first quarter ended December 28, 2024. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Results of Operations and Financial Condition. On October 23, 2024, Plexus Corp. (“we” or the “Company”) announced results for the fiscal fourth quarter and year ended September 28, 2024. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

Regulation FD Disclosure. On August 14, 2024 the Board of Directors of Plexus Corp. (the “Company”) approved a new share repurchase program that authorizes the Company to repurchase up to $50.0 million of its common stock beginning upon expiration of the Company’s previous share repurchase program, which shall remain in effect until its expiration. The Company does not have a specific schedule or commitment for the repurchase of the shares and may repurchase shares in amounts, at prices, and…

Results of Operations and Financial Condition. On July 24, 2024, Plexus Corp. (“we” or the “Company”) announced results for the fiscal third quarter ended June 29, 2024. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.

President — Steven J. Frisch: The President and Chief Strategy Officer is retiring with a planned transition where the CEO assumes the President title, representing an orderly succession rather than a sudden loss of leadership.

Results of Operations and Financial Condition. On April 24, 2024, Plexus Corp. (“we” or the “Company”) announced results for the fiscal second quarter ended March 30, 2024. A copy of the Company’s related press release is furnished as Exhibit 99.1 to this report.