UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 WASHINGTON, D.C. 20549
 FORM 11-K
  þ
    
    ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 [FEE REQUIRED]
 For
the fiscal year ended December 31, 2010.
 OR
 o
    
    TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 [NO FEE REQUIRED]
 For the transition period from _______________ to _______________
 Commission File Number: 1-4639
 CTS CORPORATION RETIREMENT SAVINGS PLAN
  905 West Boulevard NorthCTS Corporation
    
    Elkhart, IN 46514(Issuer of Securities)
    
    (Address of PrincipalExecutive Offices)




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CTS Corporation Retirement Savings Plan  Index  December 31, 2010 and 2009
 PageReport of Independent Registered Public Accounting Firm
    
    3Financial StatementsStatements of Net Assets Available for Benefits
    
    4Statement of Changes in Net Assets Available for Benefits
    
    5Notes to Financial Statements
    
    6Supplemental Schedules*Schedule H, Line 4a  Schedule of Delinquent Participant Contributions
    
    14Schedule H, Line 4i  Schedule of Assets (Held at End of Year)
    
    15
  
 *Note:
    
    Other supplementary schedules required by Section 2520.103-10 of the Department of
Labors Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974 have been omitted because they are not applicable.




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(BKD LOGO)
    
    201 N. Illinois Street, Suite 700
P.O. Box 44998
Indianapolis, IN 46244-0998
317.383.4000 Fax 317.383.4200 www.bkd.com
 
 Report of Independent Registered Public Accounting Firm
 
     Reporting Loans to
Participants by Defined Contribution Pension Plans
 
 BKD,
llp
  (BKD LOGO)
    

(PRAXITY LOGO)
 3




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CTS Corporation Retirement Savings Plan
 
 Statements of Net Assets Available for Benefits
December 31, 2010 and 2009
 2009(As adjusted 2010
    
    
    see Note 3)AssetsInvestments, at fair value
    
    $
    101,023,824
    
    
    $
    94,387,856ReceivablesNotes receivable from participants
    
    
    1,993,989
    
    
    
    1,870,970Employer contributions
    
    
    19,448
    
    
    
    Employee contributions
    
    
    49,849
    
    
    
    Total receivables
    
    
    2,063,286
    
    
    
    1,870,970Net assets available for benefits
    
    $
    103,087,110
    
    
    $
    96,258,826
  4




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CTS Corporation Retirement Savings Plan
 
 Statement of Changes in Net Assets Available for Benefits
Year Ended December 31, 2010
 AdditionsInvestment IncomeNet appreciation in fair value of investments
    
    $
    8,135,785Dividends and interest income on investments
    
    
    1,741,914Net Investment Income
    
    
    9,877,699Interest on Notes Receivable from Participants
    
    
    117,663ContributionsEmployer
    
    
    1,655,981Employee
    
    
    3,862,975Rollovers
    
    
    293,745Total Contributions
    
    
    5,812,701Other additions
    
    
    39,396Total Additions
    
    $
    15,847,459DeductionsBenefits paid to participants
    
    $
    9,001,942Administrative expenses
    
    
    17,233Total Deductions
    
    $
    9,019,175Net Increase
    
    $
    6,828,284Net assets available for benefits, beginning of year
    
    
    96,258,826Net assets available for benefits, end of year
    
    $
    103,087,110
  5




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CTS Corporation Retirement Savings Plan
 
 Notes to Financial Statements
 December 31, 2010 and 2009
 Note 1: Description of the Plan
  General
  Participation
  Contributions
      Vesting
  6




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CTS Corporation Retirement Savings Plan
 Notes to Financial Statements
 December 31, 2010 and 2009
 Payment of Benefits
  Participant Accounts
  Notes Receivable from Participants
  Note 2: Summary of Significant Accounting Policies
  Basis of Accounting
  Investments
   Notes Receivable from Participants
  Payment of Benefits
  Expenses of the Plan
  7




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CTS Corporation Retirement Savings Plan
 Notes to Financial Statements
 December 31, 2010 and 2009
 Use of Estimates in the Preparation of Financial Statements
  Note 3: Change in Accounting Principle
 Reporting Loans to Participants by
Defined Contribution Pension Plans
  2010Statement of Net Assets Available for BenefitsAs Computed Under
    
    
    As Computed UnderPrevious Guidance
    
    
    ASU 2010-25
    
    
    Effect of ChangeInvestments
    
    $
    103,017,813
    
    
    $
    101,023,824
    
    
    $
    (1,993,989
    )Notes receivable from participants
    
    
    
    
    
    
    1,993,989
    
    
    
    1,993,989Total receivables
    
    
    69,297
    
    
    
    2,063,286
    
    
    
    1,993,989
 2009Statement of Net Assets Available for BenefitsAs PreviouslyReported
    
    
    As Adjusted
    
    
    Effect of ChangeInvestments
    
    $
    96,258,826
    
    
    $
    94,387,856
    
    
    $
    (1,870,970
    )Notes receivable from participants
    
    
    
    
    
    
    1,870,970
    
    
    
    1,870,970Total receivables
    
    
    
    
    
    
    1,870,970
    
    
    
    1,870,970
 2010Statement of Changes in Net Assets Available for BenefitsAs Computed Under
    
    
    As Computed UnderPrevious Guidance
    
    
    ASU 2010-25
    
    
    Effect of ChangeInterest
    
    $
    117,663
    
    
    $
    
    
    
    $
    (117,663
    )Net investment income
    
    
    9,995,362
    
    
    
    9,877,699
    
    
    
    117,663Interest on notes receivable from participants
    
    
    
    
    
    
    117,663
    
    
    
    117,663
  8




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Note 4: Administration of the Plan
  9




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CTS Corporation Retirement Savings Plan
 Notes to Financial Statements
 December 31, 2010 and 2009
 Note 5: Plan Amendments
 Current Plan Year (2010)
  Prior Plan Year (2009)
  Note 6: Investments
  Investments
    
    2010
    
    
    2009Vanguard Prime Money Market Fund
    
    $
    17,028,642
    
    
    $
    18,886,848Mutual Funds:PIMCO Total Return Fund
    
    
    10,167,919
    
    
    
    9,577,675American Funds Growth Fund of American R4 Fund
    
    
    8,573,480
    
    
    
    8,347,812American Funds Fundamental R4 Fund
    
    
    7,715,270
    
    
    
    7,532,204GAMCO Growth Fund; Class AAA
    
    
    6,771,252
    
    
    
    6,953,638Oakmark Equity and Income Fund; Class I Shares
    
    
    6,259,268
    
    
    
    6,878,293American Funds EuroPacific Growth R4 Fund
    
    
    6,327,783
    
    
    
    6,451,138Vanguard 500 Index Fund *
    
    
    5,982,161
    
    
    
    4,195,771
 
 *
    
    Represents less than 5% of total net assets as of December 31, 2009.  Appreciation of investments at fair value, as determined by quoted market pricesCTS Corporation common stock
    
    $
    603,151Mutual funds
    
    
    7,532,634$
    8,135,785
 Note 7: Plan Termination
  10




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CTS Corporation Retirement Savings Plan
 Notes to Financial Statements
 December 31, 2010 and 2009
 Note 8: Tax Status
  Note 9: Party-In-Interest Transactions
     Note 10: Fair Value of Plan Assets
 Fair Value Measurements
 Level 1
    
    Quoted prices in active markets for identical assets or liabilitiesLevel 2
    
    Observable inputs other than Level 1 prices, such as quoted prices for similar assets or
liabilities; quoted prices in markets that are not active; or other inputs that are observable
or can be corroborated by observable market data for substantially the full term of the assets
or liabilitiesLevel 3
    
    Unobservable inputs that are supported by little or no market activity and that are
significant to the fair value of the assets or liabilities
  Investments
  11




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CTS Corporation Retirement Savings Plan  Notes to Financial Statements  December 31, 2010 and 2009
  2010Fair Value Measurements UsingQuoted Prices
    
    
    Significantin Active
    
    
    Other
    
    
    SignificantMarkets for
    
    
    Observable
    
    
    UnobservableIdentical Assets
    
    
    Inputs
    
    
    InputsFair Value
    
    
    (Level 1)
    
    
    (Level 2)
    
    
    (Level 3)Common stockTechnology
    
    $
    4,512,701
    
    
    $
    4,512,701Mutual fundsFixed incomeIntermediate-term bond
    
    $
    10,167,919
    
    
    $
    10,167,919BalancedTarget-date
    
    $
    11,862,102
    
    
    $
    11,862,102Moderate allocation
    
    $
    6,259,268
    
    
    $
    6,259,268U.S. equityLarge-cap value
    
    $
    3,949,744
    
    
    $
    3,949,744Large-cap blend
    
    $
    7,715,270
    
    
    $
    7,715,270Large-cap blend  index
    
    $
    5,982,161
    
    
    $
    5,982,161Large-cap growth
    
    $
    15,344,732
    
    
    $
    15,344,732Mid-cap value
    
    $
    196,492
    
    
    $
    196,492Mid-cap blend
    
    $
    3,924,134
    
    
    $
    3,924,134Mid-cap blend  index
    
    $
    903,211
    
    
    $
    903,211Mid-cap growth
    
    $
    1,134,138
    
    
    $
    1,134,138Small-cap blend
    
    $
    322,306
    
    
    $
    322,306Small-cap blend  index
    
    $
    2,799,265
    
    
    $
    2,799,265International equityInternational value
    
    $
    859,129
    
    
    $
    859,129International blend  index
    
    $
    1,734,827
    
    
    $
    1,734,827International growth
    
    $
    6,327,783
    
    
    $
    6,327,783Money market funds
    
    $
    17,028,642
    
    
    $
    17,028,642
 12




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CTS Corporation Retirement Savings Plan  Notes to Financial Statements  December 31, 2010 and 2009
 2009(As adjusted  see Note 3)Fair Value Measurements UsingQuoted Prices
    
    
    Significantin Active
    
    
    Other
    
    
    SignificantMarkets for
    
    
    Observable
    
    
    UnobservableIdentical Assets
    
    
    Inputs
    
    
    InputsFair Value
    
    
    (Level 1)
    
    
    (Level 2)
    
    
    (Level 3)Common stockTechnology
    
    $
    4,282,949
    
    
    $
    4,282,949Mutual fundsFixed incomeIntermediate-term bond
    
    $
    9,577,675
    
    
    $
    9,577,675BalancedTarget-date
    
    $
    9,273,618
    
    
    $
    9,273,618Moderate allocation
    
    $
    6,878,293
    
    
    $
    6,878,293U.S. equityLarge-cap value
    
    $
    3,541,977
    
    
    $
    3,541,977Large-cap blend
    
    $
    7,532,204
    
    
    $
    7,532,204Large-cap blend  index
    
    $
    4,195,771
    
    
    $
    4,195,771Large-cap growth
    
    $
    15,301,450
    
    
    $
    15,301,450Mid-cap value
    
    $
    84,143
    
    
    $
    84,143Mid-cap blend
    
    $
    3,336,720
    
    
    $
    3,336,720Mid-cap blend  index
    
    $
    507,298
    
    
    $
    507,298Mid-cap growth
    
    $
    651,980
    
    
    $
    651,980Small-cap blend
    
    $
    160,122
    
    
    $
    160,122Small-cap blend  index
    
    $
    2,058,343
    
    
    $
    2,058,343International equityInternational value
    
    $
    729,016
    
    
    $
    729,016International blend  index
    
    $
    938,311
    
    
    $
    938,311International growth
    
    $
    6,451,138
    
    
    $
    6,451,138Money market funds
    
    $
    18,886,848
    
    
    $
    18,886,848
 Note 11: Reconciliation of Financial Statements to Form 5500
  Note 12: Risks and Uncertainties
  Note 13: Nonexempt Transaction
  13




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CTS Corporation Retirement Savings Plan  
 Schedule H, line 4a  Schedule of Delinquent Participant Contributions  December 31, 2010
 Total that Constitute Nonexempt Prohibited TransactionsParticipant
    
    
    
    
    
    
    
    Total FullyContributions
    
    
    
    Contributions
    
    Contributions
    
    CorrectedTransferred Late
    
    Contributions Not
    
    Corrected Outside
    
    Pending Correction
    
    Under VFCP andto Plan
    
    Corrected
    
    VFCP
    
    in VFCP
    
    PTE 2002-51$670
    
    
    
    
    
    $670
 14




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CTS Corporation Retirement Savings Plan
Schedule H, line 4i  Schedule of Assets (Held at End of Year)
December 31, 2010
 Description of InvestmentsIdentify of Issue
    
    Including Maturity Date,Borrower, Lessor
    
    Rate of Interest, Collateral,or Similar Party
    
    Par or Maturity Value
    
    Fair Value*
    
    Vanguard Prime Money Market Fund
    
    Money Market Fund (17,028,642 shares)
    
    $
    17,028,642*
    
    CTS Corporation
    
    CTS Corporation Common Stock, no par value
(408,020 shares)
    
    
    4,512,701American Funds EuroPacific Growth R4 Fund
    
    Mutual Fund (155,550 shares)
    
    
    6,327,783American Funds Fundamental R4 Fund
    
    Mutual Fund (210,570 shares)
    
    
    7,715,270American Funds Growth Fund of America R4 Fund
    
    Mutual Fund (283,984 shares)
    
    
    8,573,480Fidelity Value Fund
    
    Mutual Fund (2,861 shares)
    
    
    196,492GAMCO Growth Fund
    
    Mutual Fund (215,714 shares)
    
    
    6,771,252Morgan Stanley Institutional Mid Cap Growth Fund
    
    Mutual Fund (31,330 shares)
    
    
    1,134,138Oakmark Equity and Income Fund
    
    Mutual Fund (225,641 shares)
    
    
    6,259,268Royce Pennsylvania Mutual Investment Fund
    
    Mutual Fund (27,666 shares)
    
    
    322,306PIMCO Total Return Fund
    
    Mutual Fund (937,135 shares)
    
    
    10,167,919Royce Premier Fund
    
    Mutual Fund (195,522 shares)
    
    
    3,924,134T. Rowe Price Equity Income Fund
    
    Mutual Fund (166,726 shares)
    
    
    3,949,744*
    
    Vanguard 500 Index Fund
    
    Mutual Fund (51,651 shares)
    
    
    5,982,161*
    
    Vanguard International Value Fund
    
    Mutual Fund (26,714 shares)
    
    
    859,129*
    
    Vanguard Mid-Cap Index Fund
    
    Mutual Fund (44,471 shares)
    
    
    903,211*
    
    Vanguard Small-Cap Index Fund
    
    Mutual Fund (80,554 shares)
    
    
    2,799,265*
    
    Vanguard Target Retirement 2005 Fund
    
    Mutual Fund (51,489 shares)
    
    
    603,966*
    
    Vanguard Target Retirement 2010 Fund
    
    Mutual Fund (45,855 shares)
    
    
    1,023,027*
    
    Vanguard Target Retirement 2015 Fund
    
    Mutual Fund (206,744 shares)
    
    
    2,567,760*
    
    Vanguard Target Retirement 2020 Fund
    
    Mutual Fund (123,746 shares)
    
    
    2,734,797*
    
    Vanguard Target Retirement 2025 Fund
    
    Mutual Fund (171,323 shares)
    
    
    2,162,097*
    
    Vanguard Target Retirement 2030 Fund
    
    Mutual Fund (52,177 shares)
    
    
    1,131,189*
    
    Vanguard Target Retirement 2035 Fund
    
    Mutual Fund (64,509 shares)
    
    
    844,426*
    
    Vanguard Target Retirement 2040 Fund
    
    Mutual Fund (14,502 shares)
    
    
    311,802*
    
    Vanguard Target Retirement 2045 Fund
    
    Mutual Fund (7,082 shares)
    
    
    95,604*
    
    Vanguard Target Retirement 2050 Fund
    
    Mutual Fund (6,818 shares)
    
    
    145,903*
    
    Vanguard Target Retirement 2055 Fund
    
    Mutual Fund (59 shares)
    
    
    1,335*
    
    Vanguard Target Retirement Income Fund
    
    Mutual Fund (21,294 shares)
    
    
    240,196*
    
    Vanguard Total International Stock Index Fund
    
    Mutual Fund (110,078 shares)
    
    
    1,734,82779,482,481*
    
    Participant loans
    
    Interest rates ranging from 5.25% to
11.5%, due from January 24, 2002 to
December 17, 2020 (338 Loans)
    
    
    1,993,989Total Assets
    
    $
    103,017,813*
    
    Party-in-interest
 15




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SIGNATURES
  CTS CORPORATION
Retirement Savings PlanBy:
    /s/ Richard G. CutterName:
    Richard G. CutterCTS Corporation
Vice President, Law and Business Affairs, Corporate Secretary  16




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EXHIBIT INDEX
 Exhibit No.
    
    Exhibit Description23(a)
    
    Consent of BKD, LLP
 17