<SEC-DOCUMENT>0000026058-26-000020.txt : 20260226
<SEC-HEADER>0000026058-26-000020.hdr.sgml : 20260226
<ACCEPTANCE-DATETIME>20260226160202
ACCESSION NUMBER:		0000026058-26-000020
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20260224
FILED AS OF DATE:		20260226
DATE AS OF CHANGE:		20260226

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Agrawal Ashish
		CENTRAL INDEX KEY:			0001529275
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04639
		FILM NUMBER:		26687648

	MAIL ADDRESS:	
		STREET 1:		2375 CABOT DRIVE
		CITY:			LISLE
		STATE:			IL
		ZIP:			60525

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CTS CORP
		CENTRAL INDEX KEY:			0000026058
		STANDARD INDUSTRIAL CLASSIFICATION:	PRINTED CIRCUIT BOARDS [3672]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				350225010
		STATE OF INCORPORATION:			IN
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4925 INDIANA AVENUE
		CITY:			LISLE
		STATE:			IL
		ZIP:			60532
		BUSINESS PHONE:		6305778800

	MAIL ADDRESS:	
		STREET 1:		4925 INDIANA AVENUE
		CITY:			LISLE
		STATE:			IL
		ZIP:			60532
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-24</periodOfReport>

    <issuer>
        <issuerCik>0000026058</issuerCik>
        <issuerName>CTS CORP</issuerName>
        <issuerTradingSymbol>CTS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001529275</rptOwnerCik>
            <rptOwnerName>Agrawal Ashish</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2>4925 INDIANA AVE</rptOwnerStreet2>
            <rptOwnerCity>LISLE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60532</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>CFO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4310</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>52.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>111054</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2024</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>52.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>109030</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Performance Stock Units were granted pursuant to the CTS Corporation 2018 Equity and Incentive Compensation Plan and were subject to the achievement of specified performance criteria for the 2023-2025 performance period. The audited financial statements for the applicable performance period were filed with the Securities and Exchange Commission on February 24, 2026, and the Compensation and Talent Committee certified the level of achievement of the applicable performance goals. The shares reported herein represent the number of shares earned and issued based on such certification.</footnote>
        <footnote id="F2">Reflects shares of the Issuer's common stock surrendered by the Reporting Person to satisfy tax withholding obligations upon the vesting of shares granted under a restricted stock agreement.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Debra S. Rouse, attorney-in-fact for Ashish Agrawal</signatureName>
        <signatureDate>2026-02-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
