mtrn-20260626

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

__________________________________

Form 11-K

__________________________________


(Mark One)

ý			ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

			For the fiscal year ended December 31, 2025

			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 001-15885
			_________________________________
			MATERION CORPORATION
			RETIREMENT SAVINGS PLAN
			(Full Title of the Plan)

			MATERION CORPORATION
			6070 Parkland Blvd.
			Mayfield Heights, OH 44124

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

Materion Corporation Retirement Savings Plan


Index of Financial Statements

			Page No.
Report of Independent Registered Public Accounting Firm			1

Financial statements:
Statements of Net Assets Available for Benefits - December 31, 202 5 and 20 24			2
Statement of Changes in Net Assets Available for Benefits - Year Ended December 31, 20 25			3
Notes to Financial Statements			4

Supplemental Schedules:
Schedule of Assets (Held at End of Year)			9

Signature			10
Exhibit Index			10

Report of Independent Registered Public Accounting Firm

To the Plan Administrator and Plan Participants of the Materion Corporation Retirement Savings Plan:

Opinion on the Financial Statements

We have audited the accompanying statements of net assets available for benefits of Materion Corporation Retirement Savings Plan (the “Plan”) as of December 31, 2025 and 2024 and the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and the related notes and schedules (collectively referred to as 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, 2025 and 2024 and the changes in net assets available for benefits for the year ended December 31, 2025, 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 audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks 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 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 Schedule of Assets (Held at End of Year) as of December 31, 2025 has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. 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 Department of Labor’s (DOL) 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.

/s/ Meaden & Moore, LTD

MEADEN & MOORE, Ltd.

We have served as the Plan’s auditor since 2017.

Cleveland, Ohio

June 26, 2026

Materion Corporation Retirement Savings Plan

Statements of Net Assets Available for Benefits

December 31, 2025 and 2024


	2025		2024
Assets
Investments at fair value	$	493,960,782	$	453,268,732
Receivables:
Employer contributions	202,681		4,627,035
Participant contributions	457,055		480,327
Notes receivable from participants	7,487,952		7,397,651
Total receivables	8,147,688		12,505,013
Total Assets	502,108,470		465,773,745


Net assets available for benefits	$	502,108,470	$	465,773,745

See accompanying notes to financial statements.

Materion Corporation Retirement Savings Plan

Statement of Changes in Net Assets Available for Benefits

Year Ended December 31, 2025


Additions
Investment income:

Net appreciation in fair value of investments	$	68,540,219
Interest and dividends	6,494,233
Total investment income	75,034,452
Interest income on notes receivable from participants	366,396
Contributions:
Participants	16,672,659
Employer	7,105,164
Catch-up	678,183
Rollover	910,204
Total contributions	25,366,210
Total additions	100,767,058
Deductions

Benefit payments	(64,432,333)
Total deductions	(64,432,333)
Net increase	36,334,725
Net assets available for benefits:
Beginning of year	465,773,745
End of year	$	502,108,470

See accompanying notes to financial statements.

Materion Corporation Retirement Savings Plan

Notes to Financial Statements

Note A - Description of the Plan

The following description of the Materion Corporation Retirement Savings Plan (the “Plan”) provides only general information. Materion Corporation (the “Company”) is the plan sponsor. Participants should refer to the plan document and Summary Plan Description for a more complete description of the Plan's provisions, copies of which may be obtained from the plan sponsor.

General

The Plan is a defined contribution plan that covers certain eligible employees of the Company. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA").

The Administrative Committee (the “Committee”) is responsible for the general administration of the Plan. Fidelity Management Trust Company is the trustee and recordkeeper for the Plan.

Eligible participants are automatically enrolled in the Plan once they have attained 18 years of age unless they affirmatively decline to participate.

Contributions

The Plan allows employees of the Company to make contributions from 1% to 50% of their earnings through pre-tax (salary reduction), Roth, and/or after-tax contributions, subject to IRC limitations for 401(k) contributions, which was $23,500 for 2025. Participants who have attained age 50 before the end of the Plan year are eligible to make catch-up contributions up to $7,500 for 2025.

Participants may also elect to make a direct rollover contribution ("rollover") to the Plan of an eligible rollover distribution from another employer-sponsored qualified plan.

The Company has a match and annual non-elective retirement contribution feature. The Company matches at a rate of 100% of the first 4% of the participant’s contribution. Contributions from Plan participants and the matching contributions from the employer are recorded in the year in which participant compensation is earned. The annual non-elective retirement contribution is made for all U.S. eligible employees and is calculated as a percentage of the employee's eligible compensation each year based on the following table:


Age			Contribution Percentage
Under 40			1.50%
40.00-44.99			1.75%
45.00-49.99			2.00%
50.00-54.99			2.25%
55.00 and over			2.50%

Effective January 1, 2025, the Company amended the Materion Corporation Retirement Savings Plan. In accordance with the amendment, the Company ceased the annual non-elective retirement contribution made for all U.S. eligible employees.

Vesting

All participant and Company matching contributions are fully and immediately vested. All employees hired prior to May 26, 2012 who are eligible to receive the annual non-elective retirement contribution are fully vested in this contribution at all times. All employees hired on and after May 26, 2012 will be fully vested in the annual non-elective retirement contribution after three years of continuous service with the Company.

Forfeitures

Non-vested participants whose services with the Company have been terminated will forfeit their entire annual non-elective retirement contribution and earnings on those contributions. Forfeitures are used periodically to reduce employer matching contributions made to the Plan, as well as Plan expenses. Forfeited amounts used were $786,700 in 2025 and $70,000 in 2024.

Materion Corporation Retirement Savings Plan

Notes to Financial Statements - Continued

Participant Accounts

Each participant’s account is credited with the participant’s contributions, the Company’s contributions, rollovers, and Plan earnings based on the participant's relative investment holdings. Administrative expenses are also allocated to participant's accounts based on the participant’s account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account.

Participant Loans

A participant may borrow funds from his/her account, provided such loan is secured by 50% of the value of the participant's account, immediately prior to the loan and evidenced by a promissory note executed by the participant; however, a loan may not be drawn from the participant's annual retirement contributions.

Participants may borrow from their accounts with a minimum loan amount of $500 up to a maximum equal to the lesser of $50,000 or 50% of their vested account balance. Loan terms range from one to five years or up to 15 years for the purchase of a principal residence. The $50,000 limit is reduced by the participant’s highest outstanding loan balance during the preceding 12-month period. A participant may not have more than one loan outstanding at any point in time. The loans are secured by the balance in the participant’s account and bear interest at a rate commensurate with local prevailing rates at the date of issuance as determined monthly by the plan administrator. Principal and interest is paid ratably through bi-weekly, or weekly (as applicable) payroll deductions over not more than five years, except for loans to purchase a principal residence. If a participant terminates employment with the Company, they may continue to make loan payments through a pre-authorized check agreement. If the loan is not repaid, it will automatically be treated as a distribution to the participant after one full calendar quarter of nonpayment.

Payment of Benefits

At retirement, death or other termination, a participant (or his death beneficiary) is eligible to receive a distribution of all employee and Company matching and vested retirement contributions credited to the employee's account plus or minus any net gain or loss thereon. Prior to termination of employment, distribution of certain amounts is permitted, not including, however, annual retirement contributions.

The value of distributions and withdrawals is based on the value of a participant's vested account on the valuation date immediately preceding the date of distribution or withdrawal and is deducted from the participant's account as of such valuation date. Benefits are recorded when paid.

Distribution to a participant or a person designated by the participant as his death beneficiary is made under one or more (as applicable) of the following methods as elected by the participant (or in certain cases the death beneficiary):

i.Lump sum payment in cash;

ii.Lump sum payment in cash, except that a participant's interest in the Company Stock Fund will be paid in full shares of Common Stock of the Company, with any fractional shares being paid in cash; and

iii.Periodic distributions, not more frequently than monthly, of at least $200.

Administrative Expenses

The Plan’s administrative expenses are paid by either the Plan or the Company, as provided by the Plan’s provisions. Administrative expenses paid by the Plan include record keeping, legal, audit and trustee fees. Expenses relating to purchases, sales, or transfers of the Plan’s investments are charged to the particular investment fund to which the expenses relate. All other administrative expenses of the Plan are paid by the Company. Expenses that are paid by the Company are excluded from these financial statements.

Investment Options

Upon enrollment in the Plan, a participant may direct employee contributions in any of the funds provided by the Plan. Participant elections may be adjusted or reallocated at any time by the participants. The Administrative Committee may adopt rules, procedures, and restrictions (e.g., timing and frequency restrictions) for transfers to or from any of the investment options.

Plan Termination

Although it has not expressed any intent to do so, the Company has the right under the Plan to terminate the Plan subject to the provisions of ERISA. In the event the Plan terminates, participants will receive distributions as if each participant of the Plan was fully vested, and had then terminated his or her employment.

Materion Corporation Retirement Savings Plan

Notes to Financial Statements - Continued

Note B - Summary of Accounting Policies

Basis of Accounting

The financial statements of the Plan have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”).

Investment Valuation

Investments are stated at fair value. The common/collective trusts are reported at net asset value ("NAV") as a practical expedient for fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). See Note E for further discussion of fair value measurements.

Purchases and sales of securities are recorded on a trade-date basis. Interest and dividend income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation/(depreciation) includes gains and losses on investments bought and sold, as well as held during the year.

The Materion Corporation Retirement Plan Investment Committee is responsible for determining the Plan’s valuation policies and analyzing information provided by the investment custodians and issuers that is used to determine the fair value of the Plan’s investments. The Materion Corporation Retirement Plan Investment Committee is comprised of three senior executive members of Materion and reports to the Audit and Risk Committee of the Board of Directors of the Company.

Notes Receivable from Participants

Notes receivable from participants represent participant loans that are recorded at their unpaid principal balance plus any accrued but unpaid interest. Interest income on notes receivable from participants is recorded when it is earned. Related fees are recorded as administrative expenses and are expensed when they are incurred. No allowance for credit losses has been recorded as of December 31, 2025 or 2024. If a participant ceases to make loan repayments and the plan administrator deems the participant loan to be a distribution, the participant loan balance is reduced and a benefit payment is recorded.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates that affect the amounts reported in the financial statements and accompanying notes and supplemental schedules. Actual results could differ from those estimates.

Note C - Income Tax Status

The Plan has received a determination letter from the Internal Revenue Service (the “IRS”) dated March 10, 2014, stating that the Plan is qualified under Section 401(a) of the Internal Revenue Code (the “Code”) and, therefore, the related trust is exempt from taxation. Subsequent to this determination by the IRS, the Plan was amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification and there have not been any reasons to submit an application for an updated determination letter under the guidance of IRS statute - Rev. Proc. 2016-37. The Plan Administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan, as amended, is qualified and the related trust is tax-exempt.

U.S. GAAP requires Plan management to evaluate uncertain tax positions taken by the Plan. The financial statement effects of a tax position are recognized when the position is more likely than not, based on the technical merits, to be sustained upon examination by the IRS. The Plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2025, there are no uncertain positions taken or expected to be taken. The Plan has recognized no interest or penalties related to uncertain tax positions. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

Note D - Transactions with Related Parties and Parties-in-Interest

Certain investments that are held by the Plan are investment funds managed by Fidelity Investments. Fidelity Management Trust Company, a subsidiary of Fidelity Investments, is the trustee as defined by the Plan and, therefore, these transactions qualify as party-in-interest transactions.

The Plan invests in the common stock of the Company. These transactions qualify as party-in-interest transactions; however, they are exempt from the prohibited transaction rules under ERISA. During 2025, the Plan received $97,945 in cash dividends from investments in common stock of the Company.

Materion Corporation Retirement Savings Plan

Notes to Financial Statements - Continued

During 2025, the Plan had the following transactions related to shares of Materion Corporation Common Stock:


Purchases	$	3,984,391
Sales	$	8,235,775

The Plan has arrangements with various service providers and these arrangements qualify as party in interest transactions.

Note E - Fair Value Measurements

The fair value framework establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below.

Level 1 - Unadjusted quoted prices in active markets that are accessible to the reporting entity at the measurement date for identical assets and liabilities.

Level 2 - Inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability. Level 2 inputs include the following:

•Quoted prices for similar assets and liabilities in active markets

•Quoted prices for identical or similar assets or liabilities in markets that are not active

•Observable inputs other than quoted prices that are used in the valuation of the assets or liabilities (e.g., interest rate and yield curve quotes at commonly quoted intervals)

•Inputs that are derived principally from or corroborated by observable market data by correlation or other means

Level 3 - Unobservable inputs for the asset or liability (i.e., supported by little or no market activity). Level 3 inputs include management’s own assumption about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measure in its entirety.

The following is a description of the valuation methods used for assets measured at fair value. There have been no changes in methodologies used at December 31, 2025.

Materion Common Stock: The fair values of these securities are based on observable market quotations for identical assets and are valued at the closing price reported on the active market on which the individual securities are traded.

Mutual Funds: These investments are publicly traded investment vehicles, which are valued daily at the closing price reported on the active market on which the individual securities are traded.

Money Market Funds: These investments include short-term instruments and cash and are valued based on quoted market prices.

Common/Collective Trust: Common/collective trust funds are maintained by investment companies and hold investments in accordance with a stated set of fund objectives. For common/collective trust funds which are not publicly quoted, the funds are valued using the NAV per fund share as a practical expedient, which is primarily derived from the quoted prices in active markets of the underlying securities, and are not classified within the fair value hierarchy. The common/collective trust funds provide for daily redemptions by the Plan at reported net asset values per share, with no advance notice requirement.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while 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.

The following table sets forth by level, within the fair value hierarchy, the Plan’s assets at fair value as of December 31, 2025 and 2024:

Materion Corporation Retirement Savings Plan

Notes to Financial Statements - Continued

Assets at Fair Value as of December 31, 2025


	Level 1		Level 2		Level 3		Total
Materion Common Stock	$	19,890,965	$	—	$	—	$	19,890,965
Mutual Funds	168,338,513		—		—		168,338,513
Money Market Funds	31,679,228		—		—		31,679,228
Other investments measured at NAV(1)	—		—		—		274,052,076
Total investments	$	219,908,706	$	—	$	—	$	493,960,782

Assets at Fair Value as of December 31, 2024


	Level 1		Level 2		Level 3		Total
Materion Common Stock	$	19,714,167	$	—	$	—	$	19,714,167
Mutual Funds	152,797,818		—		—		152,797,818
Money Market Funds	33,143,923		—		—		33,143,923
Other investments measured at NAV(1)	—		—		—		247,612,824
Total investments	$	205,655,908	$	—	$	—	$	453,268,732

(1) In accordance with subtopic 820-10, certain investments that are measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Statement of Net Assets Available for Benefits.

Note F - Risks and Uncertainties

The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market, and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants' account balances and the amounts reported in the statements of net assets available for benefits.

Note G - Subsequent Events

Management evaluates events occurring through the date the financial statements are issued in determining the accounting for and disclosure of transactions and events that affect the financial statements.

Materion Corporation Retirement Savings Plan

EIN: 34-1919973 Plan Number—003

Schedule H, Line 4i, Schedule of Assets (Held at End of Year) December 31, 2025


	Description of Investment	Current Value
Materion Corporation Common Stock*	159,998 shares	$	19,890,965
Mutual Funds:
DFA Emerging Markets	119,469 shares	4,435,881
DFA U.S. Large Cap Value Fund	227,166 shares	12,791,724
Dodge & Cox International Stock Fund*	494,039 shares	8,131,890
Fidelity Diversified International Fund K*	239,013 shares	11,596,900
Fidelity Spartan 500 Index*	242,980 shares	57,761,257
Fidelity Total International Index Fund*	102,428 shares	1,774,049
Fidelity U.S. Bond Index Fund*	329,225 shares	3,476,620
Harbor Small Cap Growth Fund Retirement*	448,475 shares	6,973,782
Harbor Small Cap Value Institutional Class*	85,742 shares	3,662,059
PIM Divers Inc. Inst.	554,068 shares	5,585,003
Prudential Global Real Estate Fund	50,859 shares	1,044,130
Prudential Total Return Bond Q	1,250,615 shares	15,232,496
Vanguard Balanced Index Fund Institutional	270,187 shares	13,998,412
Vanguard Inflation-Protected Securities Fund Institutional	358,943 shares	3,359,708
Vanguard Mid-Cap Index Fund Institutional	233,240 shares	18,514,602
		168,338,513
Money Market Funds:
Fidelity Cash Reserves Fund*	6,833 shares	6,833
Fidelity Government Money Market Fund*	31,672,395 shares	31,672,395
		31,679,228
Common/Collective Trusts:
Fidelity Freedom Blend 2065 Q*	219,951 shares	4,669,556
Fidelity Freedom Blend 2055 Q*	398,250 shares	15,949,930
Fidelity Freedom Blend 2060 Q*	392,508 shares	10,530,992
Fidelity Freedom Blend RET Q*	58,427 shares	1,082,065
Fidelity Freedom Blend 2010 Q*	16,864 shares	391,573
Fidelity Freedom Blend 2015 Q*	60,965 shares	1,526,565
Fidelity Freedom Blend 2020 Q*	418,751 shares	10,929,408
Fidelity Freedom Blend 2025 Q*	751,236 shares	21,515,387
Fidelity Freedom Blend 2030 Q*	1,199,700 shares	36,242,926
Fidelity Freedom Blend 2035 Q*	974,879 shares	33,418,838
Fidelity Freedom Blend 2040 Q*	674,161 shares	24,775,401
Fidelity Freedom Blend 2045 Q*	656,420 shares	24,852,065
Fidelity Freedom Blend 2050 Q*	437,759 shares	16,345,914
Fidelity Blue Chip Growth Commingled Pool*	1,203,644 shares	71,821,456
		274,052,076

Participant loans*	Interest rates ranging from 0.14% to 6.75% with maturity dates through 2040	7,487,952
		501,448,734

* Party-in-interest to the Plan.

SIGNATURES

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 report to be signed on its behalf by the undersigned hereunto duly authorized.


		MATERION CORPORATION
		RETIREMENT SAVINGS PLAN

Date: June 26, 2026	By:	/s/ Melissa Fashinpaur
		Melissa Fashinpaur
		Chief Accounting Officer
		Materion Corporation

EXHIBIT INDEX


Exhibit Number						Description
23.1						Consent of Independent Registered Public Accounting Firm