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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C.20549 FORM 10 - K Annual report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended December 31 , 2020 or Transition Report Pursuant to Section 13 or 15 ( d ) of The Securities Exchange Act of 1934 for the Transition Period From To Commission file number 0-31164 Preformed Line Products Company Ohio ( Exact name of registrant as specified in its charter ) ( State or Other Jurisdiction of Incorporation or Organization ) 660 Beta Drive Mayfield Village , Ohio ( Address of Principal Executive Office ) 34-0676895 ( I.R.S. Employer Identification No. ) 44143 ( Zip Code ) Title of each class ( 440 ) 461-5200 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Common Shares , $ 2 par value per share Trading Symbol ( s ) PLPC Name of each exchange on which registered NASDAQ Securities registered pursuant to Section 12 ( g ) of the Act : ( None ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes ☐ No ☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes □ No ☑ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ☑ No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ☑ No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See definitions of " accelerated filer , " " large accelerated filer " , " smaller reporting company ” and “ emerging growth company " in Rule 12b - 2 of the Exchange act . Large accelerated filer Non - accelerated filer Emerging Growth Company ☐ Accelerated filer Smaller Reporting 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 . ☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . ☑ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes ☐ No ☑ The aggregate market value of voting and non - voting common shares held by non - affiliates of the registrant as of June 30 , 2020 was $ 115,197,295 based on the closing price of such common shares , as reported on the NASDAQ National Market System . As of March 1 , 2021 , there were 4,932,008 common shares of the Company ( $ 2 par value ) outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Definitive Proxy Statement for the Annual Meeting of Shareholders to be held May 5 , 2020 are incorporated by reference into Part III , Items 10 , 11 , 12 , 13 and 14 .