X0609 4 2026-09-04 0 0000080035 PREFORMED LINE PRODUCTS CO PLPC 0001257493 RUHLMAN RANDALL M false 660 BETA DRIVE MAYFIELD VILLAGE OH 44143 0 0 1 0 0 Common shares, $2 par value 2026-09-04 2026-09-04 4 S 0 142 400.04 D 451609 D Common shares, $2 par value 2026-09-08 2026-09-08 4 S 0 5000 407.78 D 446609 D Common shares, $2 par value 414321 I by trust Common Shares, $2 par value per share 146769 I by trust 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. 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. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $406.05 to $412.21, 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. /s/Caroline S. Vaccariello, by power of attorney 2026-09-09