Results of Operations · Reg FD Disclosure

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): March 4, 2026 _________________________________________________________ Preformed Line Products Company (Exact name of Registrant as Specified in Its Charter) _________________________________________________________ Ohio 0-31164 34-0676895 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.) 660 Beta Drive Mayfield Village , Ohio 44143 (Address of Principal Executive Offices) (Zip Code) Registrant’s Telephone Number, Including Area Code: 440 461-5200 (Former Name or Former Address, if Changed Since Last Report) _________________________________________________________ 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: ☐ 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(s) Name of each exchange on which registered Common PLPC The Nasdaq Global 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 2.02 Results of Operations and Financial Condition. On March 4, 2026, Preformed Line Products Company issued a press release announcing earnings for the quarter and year ended December 31, 2025. A copy of the press release is attached hereto as Exhibit 99.1. This information shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except, as shall be expressly set forth by specific reference in such a filing. Item 7.01 Regulation FD Disclosure On March 4, 2026, the Company posted an investor presentation to its website at plp.com/investor-relations. This information shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except, as shall be expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Press release dated March 4 , 202 6 , announcing earnings for the fourth quarter and full year 2025 financial results 104 Cover Page Interactive Data File (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. PREFORMED LINE PRODUCTS COMPANY Date: March 4, 2026 By: /s/ Andrew S. Klaus Andrew S. Klaus, CFO