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The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported transaction reflects the sale of common shares from the Randall M. Ruhlman Declaration of Trust 1, dated December 10, 2020, of which the reporting person is beneficiary and trustee."}],"balance_after":446609,"source":{"system":"sec-edgar","filing":"0001257493-26-000007","document":"wk-form4_1788985050.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1257493/000125749326000007/wk-form4_1788985050.xml","form_type":"4"}},{"id":4613325,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27011,"kind":"person","name":"RUHLMAN RANDALL M","position":1,"cik":"0001257493","reported_name":"RUHLMAN RANDALL M","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common shares, $2 par value","published_at":"2026-09-09T20:17:33.000Z","date":"2026-09-04","kind":"sale","planned":false,"acquired":false,"shares":142,"price":400.04,"value":56805.68,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $400.00 to $400.45, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnotes to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported transaction reflects the sale of common shares from the Randall M. Ruhlman Declaration of Trust 1, dated December 10, 2020, of which the reporting person is beneficiary and trustee."}],"balance_after":451609,"source":{"system":"sec-edgar","filing":"0001257493-26-000007","document":"wk-form4_1788985050.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1257493/000125749326000007/wk-form4_1788985050.xml","form_type":"4"}},{"id":694916,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":26048,"kind":"person","name":"CORLETT GLEN E","position":1,"cik":"0001188615","reported_name":"CORLETT GLEN E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common shares, $2 par value","published_at":"2026-08-06T20:23:34.000Z","date":"2026-08-05","kind":"sale","planned":false,"acquired":false,"shares":2000,"price":457.02,"value":914040.0,"ownership":{"direct":false,"nature":"by IRA"},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001188615-26-000005","document":"wk-form4_1786047811.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/80035/000118861526000005/wk-form4_1786047811.xml","form_type":"4"}},{"id":698418,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27014,"kind":"person","name":"RUHLMAN ROBERT G","position":1,"cik":"0001160545","reported_name":"RUHLMAN ROBERT G","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common shares, $2 par value","published_at":"2026-08-04T20:09:29.000Z","date":"2026-06-09","kind":"gift","planned":false,"acquired":false,"shares":18000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"On June 9, 2026, the reported shares were transferred as a bona fide gift by the reporting person to the Jon Ryan Ruhlman 2025 Generation-Skipping Trust for the benefit of Jon Ryan Ruhlman and his descendants. Jon Ryan Ruhlman serves as Trustee of such trust."}],"balance_after":249673,"source":{"system":"sec-edgar","filing":"0001160545-26-000006","document":"wk-form4_1785874165.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/80035/000116054526000006/wk-form4_1785874165.xml","form_type":"4"}},{"id":698417,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27014,"kind":"person","name":"RUHLMAN ROBERT G","position":1,"cik":"0001160545","reported_name":"RUHLMAN ROBERT G","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common shares, $2 par value","published_at":"2026-08-04T20:09:29.000Z","date":"2026-06-09","kind":"gift","planned":false,"acquired":false,"shares":18000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On June 6, 2026, the reported shares were transferred as a bona fide gift by the reporting person to the Maegan Adams Ruhlman Cross 2025 Generation-Skipping Trust for the benefit of Maegan Adams Ruhlman Cross and her descendants. Maegan Adams Ruhlman Cross serves as Trustee of such trust."}],"balance_after":267673,"source":{"system":"sec-edgar","filing":"0001160545-26-000006","document":"wk-form4_1785874165.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/80035/000116054526000006/wk-form4_1785874165.xml","form_type":"4"}},{"id":698416,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27013,"kind":"person","name":"CROSS MAEGAN ADAMS RUHLMAN","position":1,"cik":"0001683450","reported_name":"CROSS MAEGAN ADAMS RUHLMAN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares, $2 par value per share","published_at":"2026-08-04T20:08:58.000Z","date":"2026-06-09","kind":"gift","planned":false,"acquired":true,"shares":18000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On June 9, 2026, the reported shares were transferred as a bona fide gift to the Maegan Adams Ruhlman Cross 2025 Generation-Skipping Trust for the benefit of the reporting person and her descendants. Maegan Adams Ruhlman Cross is the Trustee of such trust."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"On June 9, 2026, the reported shares were transferred as a bona fide gift to the Maegan Adams Ruhlman Cross 2025 Generation-Skipping Trust for the benefit of the reporting person and her descendants. Maegan Adams Ruhlman Cross is the Trustee of such trust."}],"balance_after":18000,"source":{"system":"sec-edgar","filing":"0001683450-26-000002","document":"wk-form4_1785874135.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/80035/000168345026000002/wk-form4_1785874135.xml","form_type":"4"}},{"id":698415,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27012,"kind":"person","name":"Ruhlman Jon Ryan","position":1,"cik":"0001650279","reported_name":"Ruhlman Jon Ryan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Shares, $2 par value per share","published_at":"2026-08-04T20:08:37.000Z","date":"2026-06-09","kind":"gift","planned":false,"acquired":true,"shares":18000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"by Trust"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On June 9, 2026, the reported shares were transferred as a bona fide gift from Robert Ruhlman to the Jon Ryan Ruhlman 2025 Generation-Skipping Trust for the benefit of the reporting person and his descendants. Jon Ryan Ruhlman serves as Trustee of such trust."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"On June 9, 2026, the reported shares were transferred as a bona fide gift from Robert Ruhlman to the Jon Ryan Ruhlman 2025 Generation-Skipping Trust for the benefit of the reporting person and his descendants. Jon Ryan Ruhlman serves as Trustee of such trust."}],"balance_after":18000,"source":{"system":"sec-edgar","filing":"0001650279-26-000010","document":"wk-form4_1785874114.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/80035/000165027926000010/wk-form4_1785874114.xml","form_type":"4"}},{"id":698414,"issuer":{"id":4540,"kind":"organization","name":"PREFORMED LINE PRODUCTS CO","symbol":"PLPC"},"owners":[{"id":27011,"kind":"person","name":"RUHLMAN RANDALL M","position":1,"cik":"0001257493","reported_name":"RUHLMAN RANDALL M","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common shares, $2 par value","published_at":"2026-08-04T20:07:59.000Z","date":"2026-08-03","kind":"other","planned":false,"acquired":true,"shares":9121,"price":358.15,"value":3266686.15,"ownership":{"direct":false,"nature":"by trust"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported transaction reflects the sale and transfer of common shares from The Randall M. Ruhlman Declaration of Trust 1, dated December 10, 2020, of which the reporting person is beneficiary and trustee, to the Barbara P. Ruhlman Irrevocable Trust FBO Randall M. Ruhlman, dated August 27, 2024. The transaction was effected at a purchase price equal to the fair market value of the issuer's common shares on the date of transfer, as determined by the closing market price. The transaction constituted an exchange of cash for stock between the two trusts, each of which is administered by Randall M. 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The expiration date is 10 years from the grant date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"On December 11, 2024, the reporting person was granted 7,500 stock options, of which 3,750 vested on December 11, 2025, 1,875 will vest on December 11, 2026, and the remaining 1,875 will vest on December 11, 2027. 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