UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 11-K

(Mark One)
x ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023.

or

o TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT
OF 1934
For the transition period from _____ to _____


Commission File Number: 001-36102

A.     Full title of the plan and the address of the plan, if different from that of the issuer named below:

Knowles Corporation 401(k) Plan

B.     Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

Knowles Corporation
1151 Maplewood Drive
Itasca, Illinois 60143




Table of Contents


2

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To Plan Participants and Benefits and Investment Committee
Knowles Corporation 401(k) Plan
Itasca, Illinois

Opinion on the Financial Statements

We have audited the accompanying statements of net assets available for benefits of the Knowles Corporation 401(k) Plan (the “Plan”) as of December 31, 2023 and 2022, the related statement of changes in net assets available for benefits for the year ended December 31, 2023, and the related notes (collectively, the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2023 and 2022, and the changes in net assets available for benefits for the year ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risk of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by the Plan’s management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Supplemental Information

The supplemental information in the accompanying Schedule of Assets (Held at End of Year) as of December 31, 2023 has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental information is presented for the purpose of additional analysis and is not a required part of the financial statements but included supplemental information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. The supplemental information is the responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to the financial statements as a whole.

We have served as the Plan’s auditor since 2019.

/s/ BDO USA, P.C.
Grand Rapids, Michigan
June 18, 2024

3


Knowles Corporation 401(k) Plan
Statements of Net Assets Available for Benefits
(in thousands)

December 31, 2023December 31, 2022
Assets:
Investments at fair value (Note 3)$181,366 $162,513 
Employer contributions receivable232 310 
Notes receivable from participants1,708 1,512 
Net assets available for benefits$183,306 $164,335 

See accompanying Notes to Financial Statements.
4

Knowles Corporation 401(k) Plan
Statement of Changes in Net Assets Available for Benefits
(in thousands)

Year Ended December 31, 2023
Additions:
Investment income:
Dividend income$4,477 
Net appreciation in fair value of investments22,729 
Total investment income27,206 
Interest income on notes receivable from participants80 
Contributions:
Participant8,491 
Employer4,513 
Rollover1,381 
Total contributions14,385 
Total additions41,671 
Deductions:
Distributions(22,462)
Administrative expenses(238)
Total deductions(22,700)
Net increase in assets available for benefits18,971 
Net assets available for benefits:
Beginning of year164,335 
End of year$183,306 

See accompanying Notes to Financial Statements.
5
Knowles Corporation 401(k) Plan
Notes to Financial Statements

1. Description of the Plan

The following description of the Knowles Corporation 401(k) Plan (the "Plan") provides only general information. This description of the provisions of the Plan is governed in all respects by the detailed terms and conditions contained in the Plan itself. Participants should refer to the Plan document for a more complete description of the Plan's provisions.

General
The Plan is a defined contribution plan established to encourage and facilitate retirement savings and investment by eligible employees of Knowles Corporation and its U.S. subsidiaries ("Knowles"). The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended ("ERISA").

Empower Trust Company, LLC (formerly Great-West Trust Company, LLC) (the "Trustee") has been granted authority by the Knowles Corporation Benefits & Investment Committee to purchase and sell securities.

Eligibility
All full-time employees of Knowles who have reached age 18 are immediately eligible to participate in the Plan. All part-time employees of Knowles who have reached the age of 18 and have completed at least 1,000 hours of service during a plan year are eligible to participate in the Plan.

Automatic Enrollment
The Plan has an automatic enrollment feature for all new employees. Eligible employees are enrolled automatically in the Plan at a 5% pre-tax contribution rate unless they formally opt-out of the Plan or elect to contribute at a higher or lower rate. Pre-tax contributions of participants who are automatically enrolled in the Plan will be invested in the appropriate Vanguard Target Retirement Funds based on the participant's date of birth unless the participant elects other investments permitted under the Plan.

On the first day of each Plan year, all participants who have an elective deferral of 0% will be automatically updated to a pre-tax deferral rate of 5%, except to the extent an affected participant makes an affirmative contrary election within the 31 days prior to the date that automatic contributions are to commence. All participants may complete a salary reduction agreement at any time to select an alternative deferral amount or to elect not to defer under the Plan in accordance with the deferral procedures of the Plan.

Contributions
Participant
Eligible employees of Knowles that have been enrolled or elected to participate in the Plan may make pre-tax and after-tax contributions to the Plan. Participants' pre-tax and after-tax deferrals are voluntary. Eligible compensation generally includes salary and wages, commissions, and certain bonuses. Generally, a participant may elect to exclude from 1% to 75% (in whole percentages) of his or her eligible compensation ("Participant Contribution") from current taxable income by having such amount contributed to his or her account in the Plan. The amount contributed by a participant is subject to applicable Internal Revenue Code ("IRC") limits. Employees may not exceed $27 thousand of after-tax contributions in any Plan year. Participants who have attained the age of 50 before the end of the Plan year are eligible to make catch-up contributions not to exceed $8 thousand. Catch-up contributions are subject to applicable IRC limits. Each participant has the right to roll over into the Plan certain distributions from other tax-qualified plans or appropriate individual retirement accounts. Participants may make In-Plan Roth rollovers, which allows a participant to elect to change the tax treatment of all or some of their pre-tax accounts.

Employer
The Plan provides a fixed per-payroll matching contribution ("Employer Matching Contribution") equal to 100% of the participant’s elective deferrals, not to exceed the lesser of 5% of the participant’s compensation or IRC limits. Knowles may also elect to make profit-sharing contributions for a Plan year with respect to its employees who have satisfied the eligibility requirements set forth above. No profit-sharing contributions were provided to the Plan in 2023. Such contributions are allocated in proportion to the compensation of participants who are employed by Knowles and are employees on the last day of the Plan year whether or not they have deferred any of their compensation into the Plan. Profit-sharing contributions are invested consistent with participants' investment fund elections. If a participant has not made an investment fund election, profit-sharing contributions are invested in the age-based Vanguard Target Retirement Funds based on the participant's date of birth.


6
Knowles Corporation 401(k) Plan
Notes to Financial Statements
Participant Accounts
Each participant's account is credited with the participant's contributions and employer matching contributions as well as allocations of profit-sharing contributions, if applicable, and Plan earnings. Participant accounts are charged with an allocation of administrative expenses that are paid by the Plan. Allocations are based on participant earnings, account balances, or specific participant transactions, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account.

Vesting
Participant contributions, employer matching contributions, and employer profit-sharing contributions for all participants, plus earnings thereon, vest immediately.

Distributions
A participant's vested account balance in the Plan is distributable following the participant's retirement, death, or other termination of employment.

Hardship withdrawals are permitted for any participants who are active employees and demonstrate a financial hardship which meets IRC regulations to be considered an "immediate and heavy financial need." The hardship withdrawal amount is limited to the amount "necessary" to satisfy the financial need, plus income taxes that the participant is expected to incur on the amount of the withdrawal.

Distributions from the Plan are generally made in the form of a single lump-sum payment or installment payments over a period of not more than a participant’s assumed life expectancy. For distributions that include Knowles stock, the participant may elect to receive whole shares of Knowles stock "in-kind" and the remaining fractional share in cash. In-service distributions are permitted from a participant's account balance, provided the participant has attained the age of 59 ½. Participants may delay the distribution of their account balance following their termination; however distributions are required to begin no later than April 1st following the end of the year in which a participant reaches the age of 72 (73 if the participant reached age 72 after December 31, 2022).

Notes Receivable from Participants
A participant may borrow up to 50% of their vested account balance, up to $50 thousand, with a minimum loan amount of $1 thousand from the vested portion of their account. A participant may have only one loan outstanding at any time. The notes receivable are secured by the balances in the participant's accounts. Each note receivable carries a reasonable rate of interest determined by the Plan Administrator to be commensurate with the prevailing interest rate charged on similar commercial loans made within the same locale and time period. Principal and interest is paid ratably through payroll deductions. Notes receivable outstanding as of December 31, 2023 bear interest at rates between 3.25% and 8.50%.

Allocation Provisions
Each participant has the right to direct the entire amount of his or her Plan account to be invested in one or more of the available investment funds in multiples of one percent. In addition, the Plan offers a self-directed brokerage account option that allows participants to invest in a wide array of securities including but not limited to publicly-traded stock, mutual funds, exchange traded funds, bonds, certificates of deposit, and money market funds at their discretion. Each participant has the right during any business day to transfer all or any portion of the amount in his or her account among the investment funds, except that participants who are considered Knowles "insiders" may complete transfers involving Knowles stock only during designated window periods. Participants are entitled to vote with respect to any Knowles shares in their account in the Plan in the same manner as other Knowles stockholders.

Administrative Expenses
Certain administrative expenses of the Plan related to the Trustee, recordkeeping, legal, and audit fees are paid by the Plan, unless otherwise paid by Knowles. Such administrative expenses are charged to the participants on a quarterly basis. Fees related to participant-initiated transactions are charged directly to the participant's account.


7
Knowles Corporation 401(k) Plan
Notes to Financial Statements
2. Summary of Significant Accounting Policies

Basis of Accounting
The accompanying financial statements were prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP").

Investments - Valuation
The Plan's investments are reported at fair value (see Note 3). Investments in common stock are valued at the closing market price on the last business day of the Plan year based on quotations from a national securities exchange. The fair value of investments in registered mutual funds and exchange traded funds are valued at the net asset value ("NAV") of shares held by the Plan at year end, which is obtained from an active market. Self-directed brokerage accounts are comprised of mutual funds, exchange traded funds, common stocks, and cash and cash equivalents. The individual investments in the self-directed brokerage accounts are valued on the basis of readily determinable market prices.

The fair value of units held in collective funds are based on the net asset values as of the last business day of the Plan year as determined by their respective investment managers and transactions occurring as of or close to the financial statement date. The NAV, as provided by the trustees of the collective funds, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the collective fund less its liabilities. This practical expedient is not used when it is determined to be probable that the collective fund will sell for an amount different than the reported NAV. There are no unfunded commitments or redemption clauses.

The Knowles stock fund is tracked on a unitized basis. At December 31, 2023 and 2022, the Knowles stock fund consists of common stock of Knowles Corporation and a money market fund that are sufficient to meet the daily cash needs. Unitization of the Knowles stock fund allows for daily trades. The value of a unit reflects the combined market value of the common stock and the money market fund.

Investments - Transactions and Income Recognition
Purchases and sales of investment securities are reflected on a trade-date basis. Net appreciation (depreciation) includes the Plan's gains and losses on investments bought and sold as well as held during the Plan year. Dividend income is recorded on the ex-dividend date.

Notes Receivable from Participants
Notes receivable from participants are reported at their unpaid principal balance plus any accrued but unpaid interest with no allowance for credit losses as of December 31, 2023 and 2022. Repayments of principal and interest are received through payroll deductions. The notes are collateralized by the participants' account balances. Interest income is recorded as earned.

Use of Estimates
The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures of assets, liabilities, and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Risks and Uncertainties
The Plan provides for various investment options in any combination of stocks, collective funds, mutual funds, Knowles common stock, and participant self-directed brokerage accounts. Knowles periodically reviews the investment options available in the Plan to ensure that they continue to help participants reach retirement savings goals. Investment securities are exposed to various risks, including, but not limited to, interest rate, market, liquidity, and credit risks. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in risks in the near term could materially affect participants' account balances and the amounts reported in the Statements of Net Assets Available for Benefits.

At December 31, 2023 and 2022, approximately 0.6% and 0.7%, respectively, of the Plan's assets were invested in Knowles common stock.

Distributions to Participants
Distributions to participants are recorded in the Plan's financial statements when paid.

8
Knowles Corporation 401(k) Plan
Notes to Financial Statements
Plan Termination
Although it has not expressed any intent to do so, Knowles has the right under the Plan to discontinue all contributions at any time and to terminate the Plan, subject to the provisions of the Plan, ERISA, and the IRC. As described in Note 1, participants are 100% vested in their Plan accounts.

3. Fair Value Measurements

Accounting Standards Codification ("ASC") 820, Fair Value Measurement, defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, the Plan considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance.

ASC 820 also establishes a fair value hierarchy that requires the Plan to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. ASC 820 establishes three levels of inputs that may be used to measure fair value:

Level 1: quoted prices in active markets for identical assets or liabilities.

Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities 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 liabilities.

Level 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 or significant unobservable inputs that reflect the Plan’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

There have been no changes in the methodologies used at December 31, 2023 or 2022. The methods described may produce a fair value calculation which may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The Plan’s financial instruments carried at fair value on a recurring basis by their ASC 820 fair value hierarchy level as of December 31, 2023 and 2022 are as follows:
December 31, 2023
(in thousands)Level 1Level 2Level 3Total
Fair Value
Investments:
Money market$23 $— $— $23 
Common stock1,099 — — 1,099 
Mutual funds162,897 — — 162,897 
Self-directed brokerage accounts729 — — 729 
Total investments in the fair value hierarchy164,748 — — 164,748 
Investments measured at net asset value*
Collective fundn/an/an/a16,618 
Total investments$164,748 $— $— $181,366 

9
Knowles Corporation 401(k) Plan
Notes to Financial Statements
December 31, 2022
(in thousands)Level 1Level 2Level 3Total
Fair Value
Investments:
Money market$20 $— $— $20 
Common stock1,142 — — 1,142 
Mutual funds143,949 — — 143,949 
Self-directed brokerage accounts261 — — 261 
Total investments in the fair value hierarchy145,372 — — 145,372 
Investments measured at net asset value*
Collective fundn/an/an/a17,141 
Total investments$145,372 $— $— $162,513 

4. Related-Party and Party-in-Interest Transactions

Certain Plan assets are invested in common stock of Knowles. Knowles, as the Plan sponsor, is a related party. At December 31, 2023 and 2022, the Plan held 61,359 and 69,515 shares of Knowles stock, respectively. There were no dividends received by the Plan on these shares for the year ended December 31, 2023. During the year ended December 31, 2023, the Plan recorded purchases of Knowles stock totaling $79 thousand and sales of Knowles stock totaling $221 thousand. Notes receivable from participants held by the Plan are also considered party-in-interest transactions.

Certain administrative functions are performed by employees of Knowles. No such employee receives compensation from the Plan. Certain other expenses relating to the Plan, including legal and consulting services, are paid directly by Knowles and subsequently charged to the Plan. Fees or commissions associated with each of the investment options and certain administrative expenses of the Plan are paid primarily by participants as a deduction from the amount invested or as an offset to investment earnings.

5. Income Tax Status

The Plan is governed by a pre-approved plan maintained by Empower Retirement LLC. Empower Retirement LLC received an opinion letter from the Internal Revenue Service dated November 14, 2022 concluding that the documents are acceptable under Section 401 of the IRC. Knowles relies upon this letter for the Plan’s favorable tax treatment. Although the Plan has been amended since receiving the letter, Knowles believes that the Plan is currently designed and is being operated in compliance with the applicable requirements of the IRC in all material respects. Therefore, Knowles believes that the Plan was qualified and the related trust was tax-exempt as of the financial statement dates.

U.S. GAAP requires plan management to evaluate tax positions taken by the Plan. The Plan is subject to routine audits by taxing authorities; however, there are currently no audits for any tax periods in progress.

6. Subsequent Events

The Plan evaluated subsequent events from December 31, 2023 through June 18, 2024, the date these financial statements were available to be issued.

Effective January 1, 2024, the after-tax limit for participant contributions in any Plan year was increased to $29 thousand. Additionally, effective January 1, 2024, the Plan eliminated the minimum threshold of service hours required for participation.
10


Knowles Corporation 401(k) Plan
Schedule H, line 4i - Schedule of Assets (Held at End of Year)
EIN: 90-1002689, Plan Number: 001
December 31, 2023
(in thousands)

(a)(b)(c)(d)(e)
Identity of Issuer, Borrower, Lessor, or Similar PartyDescription of Investment including Maturity Date, Rate of Interest, Collateral, Par, or Maturity ValueCost **Current Value
Knowles stock fund:
*Knowles CorporationKnowles Corporation Common Stock$1,099 
InvescoGovernment & Agency Money Market Fund23 
Mutual funds:
Dimensional Fund AdvisorsGlobal Real Estate Securities Portfolio740 
Dimensional Fund AdvisorsU.S. Targeted Value Portfolio Institutional Class2,279 
FidelityBlue Chip Growth K6 Fund7,596 
FidelitySmall Cap Growth K6 Fund4,062 
Hartford Mutual FundsStrategic Income Fund - Class R61,416 
InvescoDeveloping Markets Fund - Class Y558 
Pear Tree FundsPolaris Foreign Value Fund - Class R6226 
PIMCOCommodityRealReturn Strategy Fund Institutional Class991 
PIMCOTotal Return Fund Institutional Class3,540 
T. Rowe PriceInternational Discovery Fund I Class611 
VanguardEquity Income Fund Admiral Shares3,051 
VanguardExtended Market Index Fund Admiral Shares4,001 
VanguardInstitutional Index Fund36,375 
VanguardTarget Retirement Income Fund4,477 
VanguardTarget Retirement 2020 Fund5,599 
VanguardTarget Retirement 2025 Fund5,870 
VanguardTarget Retirement 2030 Fund19,876 
VanguardTarget Retirement 2035 Fund11,187 
VanguardTarget Retirement 2040 Fund16,005 
VanguardTarget Retirement 2045 Fund7,028 
VanguardTarget Retirement 2050 Fund5,754 
VanguardTarget Retirement 2055 Fund5,201 
VanguardTarget Retirement 2060 Fund2,041 
VanguardTarget Retirement 2065 Fund1,096 
VanguardTarget Retirement 2070 Fund24 
VanguardInternational Growth Fund Admiral Shares4,991 
VanguardTotal Bond Market Index Fund Institutional Shares5,321 
VanguardTotal International Stock Index Fund Admiral Shares2,981 
Collective fund:
Ameriprise Trust CompanyColumbia Trust Stable Income Fund Class Admin 016,618 
Self-directed brokerage accounts729 
Total investments at fair value181,366 
Notes receivable from participants:
*Participant loansInterest rates from 3.25% - 8.50%1,708 
$183,074 
*    Denotes party-in-interest to the Plan
**    Cost information is not required for participant-directed investments and therefore is not included
11

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on their behalf by the undersigned hereunto duly authorized.

 KNOWLES CORPORATION
401(k) PLAN
  
Date:June 18, 2024/s/ Michael Samonds
 
Michael Samonds
 
Director, Total Rewards
 

12

EXHIBIT INDEX

13
Exhibit 23.1


CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Knowles Corporation 401(k) Plan
Itasca, Illinois

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (333-194262) of Knowles Corporation of our report dated June 18, 2024, relating to the financial statements and supplemental schedule of the Knowles Corporation 401(k) Plan which appear in this Form 11-K for the year ended December 31, 2023.

/s/ BDO USA, P.C.
Grand Rapids, Michigan
June 18, 2024


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