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Form 8-K

sec.gov

8-K — PLEXUS CORP

Accession: 0000785786-26-000057

Filed: 2026-08-24

Period: 2026-08-24

CIK: 0000785786

SIC: 3672 (PRINTED CIRCUIT BOARDS)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________________________________________________________________________________________________________

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

____________________________________________________________________________________________________________________________________

Date of Report (Date of earliest event reported): August 24, 2026

____________________________________________________________________________________________________________________________________

PLEXUS CORP.

(Exact name of registrant as specified in its charter)

____________________________________________________________________________________________________________________________________

Wisconsin 001-14423 39-1344447

(State or other jurisdiction

of incorporation) (Commission

File Number) (IRS Employer

Identification No.)

One Plexus Way

Neenah, Wisconsin 54956

(Address of principal executive offices) (Zip Code)

Telephone Number (920) 969-6000

(Registrant’s telephone number, including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol Name of each exchange on which registered

Common Stock, $0.01 par value PLXS The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

Item 8.01    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 have a specific schedule or commitment for the repurchase of the shares and may repurchase shares in amounts, at prices, and at such times as the Company deems appropriate, subject to market conditions, legal requirements, financing and other considerations.

Item 9.01    Financial Statements and Exhibits

(d) The following exhibits are filed herewith:

Exhibit Number Description

104 Cover Page Interactive Data File (the cover page tags are embedded within the Inline XBRL document)

* * * * *

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: August 24, 2026 PLEXUS CORP.

(Registrant)

By: /s/ Angelo M. Ninivaggi

Angelo M. Ninivaggi

Executive Vice President, Chief Legal and Public Affairs Officer

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Entity File Number

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Entity Tax Identification Number

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Entity Address, Address Line One

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Entity Address, City or Town

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