Page 1

Table of Contents ( Mark One ) X 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 : 1-4639 CTS CORPORATION ( Exact name of registrant as specified in its charter ) Indiana ( State or other jurisdiction of incorporation or organization ) 4925 Indiana Avenue Lisle IL ( Address of principal executive offices ) Title of Each Class Common stock , without par value 35-0225010 ( IRS Employer Identification Number ) Registrant's telephone number , including area code : 630-577-8800 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) CTS 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 15 ( d ) of the Exchange 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 D 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 the definitions of " large accelerated filer " , " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . 60532 ( Zip Code ) CTS CORPORATION 1 Name of Each Exchange on Which Registered New York Stock Exchange Large accelerated filer Accelerated filer Non - accelerated filer Smaller reporting company □ Emerging growth market 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 Exchange Act ) . □ Yes No The aggregate market value of the voting and non - voting stock held by non - affiliates of CTS Corporation , based upon the closing sales price of CTS common stock on June 30 , 2020 , was approximately $ 637,000,000 . There were 32,348,383 shares of common stock , without par value , outstanding on February 19 , 2021 . DOCUMENTS INCORPORATED BY REFERENCE ( 1 ) Portions of the Proxy Statement to be filed for the annual meeting of shareholders to be held on or about May 13 , 2021 are incorporated by reference in Part III .