# EDGAR Filing Document

**Accession Number:** 0001104657
**File Stem:** 0001104657-26-000034
**Filing Date:** 2026-6
**Character Count:** 42561
**Document Hash:** 0e480ac415f1f0aadffec34133de51ff
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104657-26-000034.hdr.sgml**: 20260601

**ACCESSION NUMBER**: 0001104657-26-000034

**CONFORMED SUBMISSION TYPE**: SD

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260601

**DATE AS OF CHANGE**: 20260601

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MATERION Corp
- **CENTRAL INDEX KEY:** 0001104657
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL FORGING & STAMPINGS [3460]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 341919973
- **STATE OF INCORPORATION:** OH
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SD
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15885
- **FILM NUMBER:** 261049775

**BUSINESS ADDRESS:**
- **STREET 1:** 6070 PARKLAND BLVD.
- **CITY:** MAYFIELD HTS.
- **STATE:** OH
- **ZIP:** 44124
- **BUSINESS PHONE:** 2163834931

**MAIL ADDRESS:**
- **STREET 1:** 6070 PARKLAND BLVD.
- **CITY:** MAYFIELD HTS.
- **STATE:** OH
- **ZIP:** 44124

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BRUSH ENGINEERED MATERIALS INC
- **DATE OF NAME CHANGE:** 20000131

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| |
|:---|
| **UNITED STATES** |
| **SECURITIES AND EXCHANGE COMMISSION** |
| **Washington, D.C. 20549** |
| **FORM SD** |
| **Specialized Disclosure Report** |

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| | | | |
|:---|:---|:---|:---|
| **MATERION CORPORATION** | **MATERION CORPORATION** | **MATERION CORPORATION** | **MATERION CORPORATION** |
| (Exact name of registrant as specified in its charter) | (Exact name of registrant as specified in its charter) | (Exact name of registrant as specified in its charter) | (Exact name of registrant as specified in its charter) |
| **Ohio** | **001-15885** | **001-15885** | **34-1919973** |
| (State or other jurisdiction of incorporation or organization) | (Commission File Number) | (Commission File Number) | (IRS Employer Identification No.) |
|  | **6070 Parkland Blvd.** | **6070 Parkland Blvd.** |  |
|  | **Mayfield Heights, Ohio 44124** | **Mayfield Heights, Ohio 44124** |  |
|  | (Address of principal executive offices) | (Zip code) |  |
|  | **Gregory R. Chemnitz** | **Gregory R. Chemnitz** |  |
|  | **Vice President, General Counsel and Secretary** | **Vice President, General Counsel and Secretary** |  |
|  | **(216) 486-4200** | **(216) 486-4200** |  |
|  | (Name and telephone number, including area code, of the person to contact in connection with this report.) | (Name and telephone number, including area code, of the person to contact in connection with this report.) |  |

---

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| | |
|:---|:---|
| Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which | Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which |
| the information in this form applies: | the information in this form applies: |
| 🗷 | Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2025. |
| ◻ | Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13.13q-1) for one fiscal year ended December 21, 2025. |

---

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**Section 1. Conflict Minerals Disclosure**

**Item 1.01 Conflict Minerals Disclosure and Report**

**Materion's Conflict Minerals Disclosure**

Materion Corporation (including its consolidated subsidiaries, the "***Company***") is filing this Specialized Disclosure Report on Form SD ("***Form SD***") pursuant to Rule 13p-1 (the "***Rule***") under the Securities Exchange Act of 1934 for the reporting period from January 1, 2025 to December 31, 2025 (the "***Reporting Period***").

The Rule, through Form SD, requires the disclosure of certain information if a company manufactures or contracts to manufacture products for which certain "conflict minerals" (as defined below) are necessary to the functionality or production of such products. The Securities and Exchange Commission ("***SEC***") defines "***conflict minerals***" as: (i)(a) columbite-tantalite (or coltan, the metal ore from which tantalum is extracted), (b) cassiterite (the metal ore from which tin is extracted), (c) gold and (d) wolframite (the metal ore from which tungsten is extracted), or their derivatives, which are currently limited to tantalum, tin and tungsten; or (ii) any other mineral or its derivatives determined by the U.S. Secretary of State to be financing conflict in the Democratic Republic of the Congo or an "adjoining country," as such term is defined in Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "***Covered Countries"***).

The Company's operations may at times manufacture, or contract to manufacture, products for which conflict minerals are necessary to the functionality or production of those products (collectively, the "***products***"). As required by the Rule, the Company has conducted a good faith, reasonable country of origin inquiry ("***RCOI***") regarding the conflict minerals included in its products during the Reporting Period to determine whether any such conflict minerals originated in the Covered Countries and/or whether any of the conflict minerals were from recycled or scrap sources. Where applicable, the Company has conducted additional due diligence regarding the sources of the conflict minerals. The results of the Company's RCOI regarding the conflict minerals, as well as its additional due diligence regarding the sources of such conflict minerals, are contained in the Company's Conflict Minerals Report, a copy of which is filed as Exhibit 1.01 to this Form SD, and is publicly available at www.materion.com. The content on, or accessible through, any web site referred to in this Form SD is not incorporated by reference into this Form SD unless expressly noted.

**Item 1.02 Exhibit**

As specified in Section 3 of Form SD, the Company is hereby filing its Conflict Minerals Report as Exhibit 1.01 to this Form SD.

**Section 3. Exhibits**

**Item 3.01 Exhibits**

The following exhibit is filed as part of this Form SD.

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**<u>Exhibit No.</u>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<u>Description</u>**

1.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<u>[Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form](materion2025conflictminera.htm)</u>.

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.

**MATERION CORPORATION**

By: <u>/s/ Gregory R. Chemnitz</u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

Gregory R. Chemnitz&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;June 1, 2026

Vice President, General Counsel and Secretary

## Exhibit 1.01

**Exhibit 1.01**

**Conflict Minerals Report of Materion Corporation**

**for the Reporting Period from January 1, 2025 to December 31, 2025**

**Overview**

This Conflict Minerals Report (this "***Report***") of Materion Corporation (including its consolidated subsidiaries, "***we***", "***Materion***" or the "***Company***") has been prepared pursuant to Rule 13p-1 (the "***Rules***") as promulgated under the Securities Exchange Act of 1934 for the reporting period from January 1, 2025 to December 31, 2025 (the "***Reporting Period***").

*Forward-looking statements contained in this Report are made based on known events and circumstances at the time of release, and as such, are subject in the future to unforeseen uncertainties and risks. Statements in this Report which express a belief, expectation or intention, as well as those that are not historical fact, are forward-looking statements, including statements related to the Company's compliance efforts and expected actions identified in this Report. These forward-looking statements are subject to various risks, uncertainties and assumptions, including, among other matters, the Company's customers' requirements to use certain suppliers, the Company's suppliers' responsiveness and cooperation with the Company's due diligence efforts, the Company's ability to implement improvements in its conflict minerals program and the Company's ability to identify and mitigate related risks in its supply chain. If one or more of these or other risks materialize, actual results may vary materially from those expressed. For a more complete discussion of these and other risk factors, see the Company's other filings with the Securities and Exchange Commission ("****SEC****"), including its Annual Report on Form 10-K for the year ended December 31, 2025 and subsequent Quarterly Reports on Form 10-Q. The Company makes these statements as of the date of this disclosure, and undertakes no obligation to update them unless otherwise required by law.*

Rule 13p-1, through Form SD, requires the disclosure of certain information if a company manufactures or contracts to manufacture products for which certain "conflict minerals" (as defined below) are necessary to the functionality or production of such products. The SEC defines "***conflict minerals***" as: (i)(a) columbite-tantalite (or coltan, the metal ore from which tantalum is extracted), (b) cassiterite (the metal ore from which tin is extracted), (c) gold and (d) wolframite (the metal ore from which tungsten is extracted), or their derivatives, which are currently limited to tantalum, tin and tungsten; or (ii) any other mineral or its derivatives determined by the U.S. Secretary of State to be financing conflict in the Democratic Republic of the Congo or an "adjoining country," as such term is defined in Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (collectively, the "***Covered Countries***").

The Company's operations may at times manufacture, or contract to manufacture, products for which conflict minerals are necessary to the functionality or production of those products (collectively, the "***products***"). As required by the Rule, the Company has conducted a good faith, reasonable country of origin inquiry ("***RCOI***") regarding the conflict minerals included in the products during the Reporting Period to determine whether any such conflict minerals originated in the Covered Countries and/or whether any of the conflict minerals were from recycled or scrap sources. Where applicable, the Company has conducted additional due diligence regarding the sources of the conflict minerals. The results of the Company's RCOI regarding the conflict minerals, as well as the Company's additional due diligence regarding the sources of such conflict minerals, are contained in this Report,

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which is publicly available at www.materion.com. The content on, or accessible through, any web site referred to in this Report is not incorporated by reference into this Report unless expressly noted.

Materion, through its wholly owned subsidiaries, is an integrated producer of high-performance advanced engineered materials used in a variety of electrical, electronic, thermal and structural applications. Our products are sold into numerous end markets, including semiconductor, consumer electronics, industrial components, defense, automotive electronics, telecommunications infrastructure, energy and commercial aerospace.

Our businesses are organized under four reportable segments: Performance Materials, Electronic Materials, Precision Optics, and Other. Our Other reportable segment includes unallocated corporate costs.

***Performance Materials***

Performance Materials provides advanced engineered solutions comprised of beryllium and non-beryllium containing alloy systems and custom engineered parts in strip, bulk, rod, plate, bar, and other customized shapes at manufacturing facilities located throughout the United States and Europe. This segment operates the world's largest bertrandite ore mine and refinery, which is located in Utah, providing feedstock hydroxide for its beryllium businesses and external sales. In addition to the products described below, this segment provides engineering and product development services to help our customers and partners with product design, including delivering prototype parts and other data to demonstrate that the products will perform under the specified design conditions.

***Electronic Materials***

Electronic Materials produces advanced chemicals, microelectronics packaging, precious metal, non-precious metal and specialty metal products, including vapor deposition targets, frame lid assemblies, clad and precious metal pre-forms and high temperature braze materials. These products are used in semiconductor logic and memory, medical, energy, lighting, defense, optics and wireless communications applications within the consumer electronics, industrial components, and telecommunications infrastructure end markets. Electronic Materials also has metal recovery operations and in-house refining that allow for the recycling of precious metals.

***Precision Optics***

Precision Optics provides custom made, precision optical filter products spanning a broad range of the electromagnetic spectrum (from UV to LWIR) and offers assembly capabilities at manufacturing facilities located in the United States, Europe, and Asia.

Precision Optics possesses broad and in-depth knowhow in optical thin-film coating processes, complemented by sophisticated patterning, glass bonding and sealing, and further processing capabilities necessary for producing optical thin film coated components up to optical subassemblies. Highly experienced and skilled development and engineering teams collaborate closely with customers to develop innovative solutions meeting their specific requirements. The combination of these capabilities and skills places Precision Optics at the forefront of markets in the photonics industry such as semiconductor, industrial, aerospace and defense, consumer electronics, and automotive.

***Other***

The Other segment is comprised of unallocated corporate costs.

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**Description of Materion's Reasonable Country of Origin Inquiry**

Materion has performed a good faith RCOI regarding the conflict minerals that were in our supply chain between January 1, 2025 and December 31, 2025 to determine whether any of the conflict minerals originated in the Covered Countries and whether any of the conflict minerals may be from recycled or scrap sources in accordance with the Rule and related guidance provided by the SEC.

The Company's global supply chain is complex. In the course of its business operations, the Company may purchase materials and metals containing conflict minerals. These materials and metals may, in turn, be included in the Company's products. Because the Company does not normally purchase conflict minerals directly from mines, smelters or refiners, there are many third parties in the supply chain between the Company and the original sources of conflict minerals. As a result, the Company relies on its direct suppliers to provide information regarding the origin of any conflict minerals that are included in its products. In accordance with the framework in the Organization for Economic Co-operation and Development Due Diligence Guidelines for Responsible Supply Chain of Minerals from Conflict-Affected and High Risk Areas: Third Edition, including the related supplements on gold, tin, tantalum and tungsten (the "***OECD Guidelines***"), and related guidance provided by the SEC, the Company worked with its direct suppliers to identify, where possible, the smelters and/or refiners and countries of origin of the conflict minerals.

Prior to and during the Reporting Period, the Company worked to identify current and new direct materials suppliers that it believed provided materials or metals containing conflict minerals (collectively, the "***Identified Suppliers***"). The Company then surveyed all the Identified Suppliers to determine whether each such Identified Supplier was supplying materials or metals to the Company that contained conflict minerals and, if so, to determine the source of such conflict minerals. The Company's surveys required Identified Suppliers to, among other matters, confirm the source of any conflict minerals contained in materials or metals supplied to the Company and to provide any updates regarding such responses.

The Company, with respect to the Reporting Period, reasonably determined that certain of its products described above under "*Overview*" contain conflict minerals necessary to the functionality or production of such products.

For the Reporting Period, the Company sought and obtained representations from all 52 Identified Suppliers from whom the Company sought such representations. Such representations included, from all Identified Suppliers, Responsible Minerals Initiative ("***RMI***") Conflict Minerals Reporting Template ("***CMRT***") indicating the smelter/refiner at which the conflict minerals were sourced participated in an independent third-party conflict minerals audit reporting using the industry-wide standard. 100% of these suppliers responded with a completed CMRT.

Although all Identified Suppliers provided completed CMRTs, based on the information obtained through the RCOI process, the Company concluded that it still lacks sufficient information to determine the country of origin of all conflict minerals for the Reporting Period

**Due Diligence**

For the Reporting Period, Materion performed due diligence from February 2026 through May 2026 to determine the source and chain of custody necessary to determine conflict minerals in the Company's product offerings. Materion designed its due diligence measures to conform in all material respects with the OECD Guidelines and the Responsible Business Alliance's Responsible Minerals Assurance Process ("***RMAP***"). This process included building conflict minerals awareness across the supply base and the survey of all Identified Suppliers that were known to or may have provided products containing metal and /or conflict minerals.

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Materion occupies a "downstream" position in the supply chain and followed the principles outlined in the OECD Guidelines for downstream companies with no direct relationships to smelters or refiners. In this context, "downstream" refers to the supply chain from smelters and refiners to retailers and includes companies such as ours, as well as product and component manufacturers and retailers. A summary of Materion's due diligence activities in line with the OECD Guidelines is outlined below.

*Step 1: Establish strong company management systems:*

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion has published a Responsible Minerals Sourcing Policy to address conflict minerals sourcing in the Covered Countries expanding the scope to include conflict-affected and high-risk areas ("***CAHRAs***") in accordance with UN resolutions. Under this policy, Materion will only purchase materials such as tin, tantalum, tungsten, and gold from sources not involved in or contributing to illegal armed groups, human rights violations, or financial wrongdoings. Materion expects all Identified Suppliers and supply chain partners to follow this guidance;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion maintains a governance model to oversee the implementation and ongoing management of the Conflict Minerals Compliance Program. The governance model consists of two groups: The Steering Committee and the Core Team, and various work products. The objective is to develop, document and maintain a governance structure that enables sustainable compliance and actively mitigates the risk of regulatory non-compliance;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion maintains a process to evaluate raw materials, parts and suppliers in the supply chain for potential conflict minerals risk;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion communicates its policy regarding the responsible sourcing of conflict minerals to all existing and new suppliers with clear performance objectives including through language incorporated in supplier contracts, agreements, flow down language in all United States Government contracts and the Materion Supplier Code of Conduct. Additionally, wording has been added to supplier contracts and written agreements including the right to conduct unannounced spot-checks;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion continues to leverage SAP and other enterprise risk management ("***ERP***") systems and Quality Management procedural controls to prevent transactions with non-conforming conflict mineral suppliers;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion has established long-term relationships with suppliers and closely manages the pool of suppliers eligible to be utilized; and

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion will continue to refer to RMI's Grievance Mechanism to collect information on grievances for all interested parties to provide information or voice their concerns regarding its sourcing and use of conflict minerals in its products.

*Step 2: Identify and assess risks in the supply chain:*

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• On an annual basis, Materion evaluates raw materials and parts that are known or are likely to contain conflict minerals using a risk-based approach;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Each compliance year, Materion requires identified suppliers to provide a CMRT. Materion has a 100% response rate for eleven consecutive years;

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion engages Identified Suppliers in one-on-one individualized capability training in order to build their capabilities and to enable them to improve their understanding of the regulation and their responsibility as a Materion supplier;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion requires all Suppliers provide their CMRT aggregating all the smelters/refiners in their Supply Chain including the mineral name and address of the smelter or refiner and CID number. In addition, Materion expects the Identified Suppliers to implement Materion's requirements to their upstream partners and within all levels of the supply chain;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion conducts a review of supplier responses to determine that all required questions and sections of the CMRT were completed, follows up with any supplier that did not complete all required questions, and verifies the CMRT had an acceptable Effective Date and appropriate CMRT version;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion reviews the survey responses and validates them for completeness and sufficiency;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion reviews aggregated supplier survey responses and reports key metrics as part of the monthly conflict minerals reporting process; and

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion conducts an annual review of summary smelter information to determine if the smelter is certified as conformant or presents a "red flag" as defined by the OECD Guidelines. To make the determination of each smelter's conflict status, Materion relies upon information provided by the RMI. RMI conducts a Responsible Minerals Assurance Process (RMAP), in which it validates conformance with RMI Standards for responsible mineral procurement. Conformant smelters and refiners are those which have in place due diligence systems and processes that conform with the RMI standards. RMAP is not a material validation assessment. RMI makes available to the public the list of smelters/refiners that have been assessed and verified by RMI, as well as facilities that qualify for assessment or are in the process of assessment. Additionally, Materion is a member of RMI and party to additional information such as country of origin and risk management assessment tools not available to non-members.

*Step 3: Design and implement a strategy to respond to identified risks:*

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Annually, Materion completes the RMAP Downstream Assessment, the RMI and OECD Due Diligence Guidance Expectations for Downstream companies, at the conclusion of its due diligence and provides a summary of the identified risks and gaps to senior management with recommended action plans to reduce risks and close gaps;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion maintains a risk mitigation strategy with the goal of systematically reducing exposure to certain risk and the likelihood of its occurrence;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion maintains a risk mitigation plan and monitors execution. New supplier onboarding includes requirements for all suppliers to provide a current CMRT and an agreement to respond to annual conflict minerals surveys;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion continues to systematically and procedurally limit purchasing with suppliers based on their unresponsiveness to conflict minerals inquiries or use of non-Conformant Smelters and Refiners and communicates to suppliers to discontinue use of specific smelters as directed. Materion works with suppliers to identify alternative sources of material as a risk mitigation strategy for on-going conflict in Covered Countries as well as CAHRAs. Materion has made and will continue to make sourcing decisions

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based on Identified Suppliers using smelters or refiners that have not participated in or completed a third-party audit;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion places additional restrictions on smelter sources based on non-conflict mineral related customer requirements;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion reports new identified risk to The Steering Committee and in coordination with the Core Team implements strategies to mitigate current risks and prevent reoccurring risks; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Additional fact finding, risk assessments and changes in circumstances take place as part of Materion's annual review of its Conflict Minerals Compliance Playbook.

*Step 4: Carry out independent third-party audit of smelter/refiner's due diligence practices:*

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• In accordance with the OECD Guidelines, Materion participates and contributes through industry organizations, including membership in RMI, to enhance transparency and traceability in the supply chain and supports independent third-party audits of smelters/refiners including recommendations for improvements in smelter due diligence practices, building capacity, mitigating risk and improving due diligence performance; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Materion performs spot-checks of their suppliers' smelters for specific circumstances to confirm adherence to Materion requirements and as a member of RMI is contributing to on-going smelter audits. Additionally, Materion reaches out to smelters identified by their suppliers to request that they participate in the RMI RMAP initiative and become certified as Conformant. Furthermore, Materion's gold refining operations in Buffalo, New York and Tantalum refining operations in Newton, Massachusetts maintain their RMI Conformant status.

*Step 5: Report annually on supply chain due diligence:*

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Annually, Materion performs due diligence in their conflict minerals supply chain, maintains a process to summarize, review and approve compliance results, completes the Form SD and the Conflict Minerals Report and timely files the Form SD and any Conflict Minerals Report with the SEC; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Annually upon request, Materion provides downstream partners a Company or Product level CMRT including smelters used in the production of parts and materials purchased from Materion.

***Continuous Improvement of Supply Chain Due Diligence***

The Company expects to continue to maintain its supply chain due diligence efforts including:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to implement plans to support and build supplier capabilities and design improvement plans with suppliers to enhance the Company's risk mitigation plan;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to assess the presence of conflict minerals in its supply chain as part of the New Product Introduction ("NPI") process;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to require suppliers to identify the conflict minerals contained in the products they supply and when requested on an annual basis, to provide current, accurate and complete information on the smelters/refiners used in the manufacturing of materials supplied to Materion;

&nbsp;&nbsp;&nbsp;&nbsp;

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to compare RCOI results to information collected via independent conflict free smelter validation programs such as the RMAP;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to partner with suppliers who are committed to participation in obtaining a "conformant" designation from an industry program such as the RMAP; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to respond to customer requests to source responsibility and limit smelters active in the supply chain in CAHRAs, for cobalt and other minerals other than 3TG or due to non-conflict minerals sourcing concerns such as embargos or sanctioned countries.

**Determination**

Based on the process described above, Materion achieved a 100% response rate from the 52 Identified Suppliers of direct material reported supplying raw materials or parts containing conflict minerals, and of the 133 identified smelters or refiners, 130 were conformant and one was actively seeking conformance. Two smelters or refiners became non-conformant in late 2025.

Based on the information provided by Materion suppliers utilized during 2025, Materion believes that the facilities that may have been used to process conflict minerals in Materion's products included the smelters and refiners lists in Appendix I.

Based on the due diligence efforts and the absence of full supply chain visibility throughout the supply base, Materion is unable to determine the origin of the conflict minerals and does not have sufficient information to conclusively determine the countries of origin of conflict minerals contained in Materion's products.

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**Appendix I: Smelters Identified in the Materion Supply Chain** 

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| | | | | |
|:---|:---|:---|:---|:---|
| **Metal** | **Smelter ID** | **Smelter Reference List** | **Smelter Country** | **RMI** |
| Tungsten | CID000004 | A.L.M.T. Corp. | JAPAN | Conformant |
| Gold | CID000035 | Agosi AG | GERMANY | Conformant |
| Gold | CID000077 | Argor-Heraeus S.A. | SWITZERLAND | Conformant |
| Tungsten | CID000105 | Kennametal Huntsville | UNITED STATES OF AMERICA | Conformant |
| Gold | CID000113 | Aurubis AG | GERMANY | Conformant |
| Gold | CID000176 | C. Hafner GmbH + Co. KG | GERMANY | Conformant |
| Gold | CID000185 | CCR Refinery - Glencore Canada Corporation | CANADA | Conformant |
| Tungsten | CID000218 | Guangdong Xianglu Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID000228 | Chenzhou Yunxiang Mining and Metallurgy Co., Ltd. | CHINA | Conformant |
| Gold | CID000233 | Chimet S.p.A. | ITALY | Conformant |
| Tantalum | CID002558 | Global Advanced Metals Aizu | JAPAN | Conformant |
| Tungsten | CID000258 | Chongyi Zhangyuan Tungsten Co., Ltd. | CHINA | Conformant |
| Tantalum | CID000291 | Guangdong Rising Rare Metals-EO Materials Ltd. | CHINA | Conformant |
| Tin | CID000292 | Alpha Assembly Solutions Inc | UNITED STATES OF AMERICA | Conformant |
| Tin | CID000313 | PT Premium Tin Indonesia | INDONESIA | Conformant |
| Tin | CID000377 | Dongguan Best Alloys Co., Ltd. | CHINA | Conformant |
| Tin | CID000402 | Dowa | JAPAN | Conformant |
| Tin | CID000438 | EM Vinto | BOLIVIA (PLURINATIONAL STATE OF) | Conformant |
| Tin | CID000448 | Estanho de Rondonia S.A. | BRAZIL | Conformant |
| Tantalum | CID000460 | F&X Electro-Materials Ltd. | CHINA | Conformant |
| Tin | CID000468 | Fenix Metals | POLAND | Conformant |
| Tin | CID000538 | Gejiu Non-Ferrous Metal Processing Co., Ltd. | CHINA | Conformant |
| Tungsten | CID000568 | Global Tungsten & Powders LLC | UNITED STATES OF AMERICA | Conformant |
| Tantalum | CID000616 | XIMEI RESOURCES (GUANGDONG) LIMITED | CHINA | Conformant |
| Gold | CID000694 | Heimerle + Meule GmbH | GERMANY | Conformant |
| Gold | CID000707 | Heraeus Ltd. Hong Kong | CHINA | Conformant |
| Gold | CID000711 | Heraeus Germany GmbH Co. KG | GERMANY | Conformant |
| Tungsten | CID000766 | Hunan Chenzhou Mining Co., Ltd. | CHINA | Conformant |
| Tungsten | CID000825 | Japan New Metals Co., Ltd. | JAPAN | Conformant |
| Tantalum | CID000914 | JiuJiang JinXin Nonferrous Metals Co., Ltd. | CHINA | Conformant |
| Tantalum | CID000917 | Jiujiang Nonferrous Metals Smelting Company Limited | CHINA | Conformant |
| Gold | CID000920 | Johnson Matthey Inc. (USA) | UNITED STATES OF AMERICA | Conformant |
| Gold | CID000924 | Asahi Refining Canada Ltd. | CANADA | Conformant |
| Tungsten | CID000966 | Kennametal Fallon | UNITED STATES OF AMERICA | Conformant |
| Gold | CID000969 | Kennecott Utah Copper LLC | UNITED STATES OF AMERICA | Conformant |
| Tin | CID001070 | China Tin Group Co., Ltd. | CHINA | Conformant |
| Tin | CID001105 | Malaysia Smelting Corporation (MSC) | MALAYSIA | Conformant |
| Tin | CID001142 | Metallic Resources, Inc. | UNITED STATES OF AMERICA | Conformant |
| Gold | CID001147 | Metalor Technologies (Suzhou) Ltd. | CHINA | Conformant |
| Gold | CID001149 | Metalor Technologies (Hong Kong) Ltd. | CHINA | Conformant |
| Gold | CID001152 | Metalor Technologies (Singapore) Pte., Ltd. | SINGAPORE | Conformant |
| Gold | CID001153 | Metalor Technologies S.A. | SWITZERLAND | Conformant |
| Gold | CID001157 | Metalor USA Refining Corporation | UNITED STATES OF AMERICA | Conformant |
| Gold | CID001161 | Metalurgica Met-Mex Penoles S.A. De C.V. | MEXICO | Conformant |
| Tantalum | CID001163 | Metallurgical Products India Pvt., Ltd. | INDIA | Conformant |
| Tin | CID001173 | Mineracao Taboca S.A. | BRAZIL | Conformant |
| Tin | CID001182 | Minsur | PERU | Conformant |
| Tin | CID001191 | Mitsubishi Materials Corporation | JAPAN | Conformant |
| Tin | CID001231 | Jiangxi New Nanshan Technology Ltd. | CHINA | Conformant |
| Tantalum | CID001277 | Ningxia Orient Tantalum Industry Co., Ltd. | CHINA | Conformant |
| Tin | CID001314 | O.M. Manufacturing (Thailand) Co., Ltd. | THAILAND | Conformant |
| Tin | CID001337 | Operaciones Metalurgicas S.A. | BOLIVIA (PLURINATIONAL STATE OF) | Conformant |

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| | | | | |
|:---|:---|:---|:---|:---|
| Gold | CID001352 | MKS PAMP SA | SWITZERLAND | Conformant |
| Tin | CID001399 | PT Artha Cipta Langgeng | INDONESIA | Active |
| Tin | CID001453 | PT Mitra Stania Prima | INDONESIA | Conformant |
| Tin | CID001458 | PT Prima Timah Utama | INDONESIA | Conformant |
| Tin | CID001477 | PT Timah Tbk Kundur | INDONESIA | Conformant |
| Tin | CID001482 | PT Timah Tbk Mentok | INDONESIA | Conformant |
| Tantalum | CID001522 | Yanling Jincheng Tantalum Co., Ltd. | CHINA | Conformant |
| Gold | CID001534 | Royal Canadian Mint | CANADA | Conformant |
| Tin | CID001539 | Rui Da Hung | TAIWAN, PROVINCE OF CHINA | Conformant |
| Gold | CID001585 | SEMPSA Joyeria Plateria S.A. | SPAIN | Conformant |
| Tin | CID001898 | Thailand Smelting & Refining Co Ltd | THAILAND | Conformant |
| Gold | CID001980 | Umicore S.A. Business Unit Precious Metals Refining | BELGIUM | Conformant |
| Tin | CID002036 | White Solder Metalurgia e Mineracao Ltda. | BRAZIL | Conformant |
| Tungsten | CID002044 | Wolfram Bergbau und Hütten AG | AUSTRIA | Conformant |
| Tungsten | CID002082 | Xiamen Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID002158 | Yunnan Chengfeng Non-ferrous Metals Co., Ltd. | CHINA | Non-conformant |
| Tin | CID002180 | Yunnan Tin Company Limited | CHINA | Conformant |
| Tungsten | CID002315 | Ganzhou Jiangwu Ferrotungsten Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002316 | Jiangxi Yaosheng Tungsten Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002317 | Jiangxi Xinsheng Tungsten Industry Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002318 | Jiangxi Tonggu Non-ferrous Metallurgical & Chemical Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002319 | Malipo Haiyu Tungsten Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002320 | Xiamen Tungsten (H.C.) Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002321 | Jiangxi Gan Bei Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID002468 | Magnu's Minerais Metais e Ligas Ltda. | BRAZIL | Conformant |
| Tantalum | CID002492 | Hengyang King Xing Lifeng New Materials Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002494 | Ganzhou Seadragon W & Mo Co., Ltd. | CHINA | Conformant |
| Tungsten | CID002502 | Asia Tungsten Products Vietnam Ltd. | VIET NAM | Conformant |
| Tin | CID002503 | PT ATD Makmur Mandiri Jaya | INDONESIA | Conformant |
| Tantalum | CID002504 | D Block Metals, LLC | UNITED STATES OF AMERICA | Conformant |
| Tantalum | CID002505 | FIR Metals & Resource Ltd. | CHINA | Conformant |
| Tungsten | CID002513 | Hunan Shizhuyuan Nonferrous Metals Co., Ltd. Chenzhou Tungsten Products Branch | CHINA | Non-conformant |
| Tin | CID002517 | O.M. Manufacturing Philippines, Inc. | PHILIPPINES | Conformant |
| Tungsten | CID002541 | H.C. Starck Tungsten GmbH | GERMANY | Conformant |
| Tungsten | CID002542 | TANIOBIS Smelting GmbH & Co. KG | GERMANY | Conformant |
| Tungsten | CID002543 | Masan High-Tech Materials | VIET NAM | Conformant |
| Tantalum | CID002544 | TANIOBIS Co., Ltd. | THAILAND | Conformant |
| Tantalum | CID002545 | TANIOBIS GmbH | GERMANY | Conformant |
| Tantalum | CID002548 | Materion Newton Inc. | UNITED STATES OF AMERICA | Conformant |
| Tantalum | CID002549 | TANIOBIS Japan Co., Ltd. | JAPAN | Conformant |
| Tantalum | CID002550 | TANIOBIS Smelting GmbH & Co. KG | GERMANY | Conformant |
| Tungsten | CID002551 | Jiangwu H.C. Starck Tungsten Products Co., Ltd. | CHINA | Conformant |
| Tantalum | CID002557 | Global Advanced Metals Boyertown | UNITED STATES OF AMERICA | Conformant |
| Tin | CID002570 | CV Avi Jaya | INDONESIA | Conformant |
| Tungsten | CID002589 | Niagara Refining LLC | UNITED STATES OF AMERICA | Conformant |
| Tin | CID002593 | PT Rajehan Ariq | INDONESIA | Conformant |
| Tungsten | CID002641 | China Molybdenum Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID002696 | PT Cipta Persada Mulia | INDONESIA | Conformant |
| Tin | CID002706 | Resind Industria e Comercio Ltda. | BRAZIL | Conformant |
| Tin | CID002756 | Super Ligas | BRAZIL | Conformant |
| Tin | CID002773 | Aurubis Beerse | BELGIUM | Conformant |
| Tin | CID002774 | Aurubis Berango | SPAIN | Conformant |
| Tin | CID002776 | PT Bangka Prima Tin | INDONESIA | Conformant |
| Gold | CID002778 | WIELAND Edelmetalle GmbH | GERMANY | Conformant |
| Tungsten | CID002827 | Philippine Chuangxin Industrial Co., Inc. | PHILIPPINES | Conformant |

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| | | | | |
|:---|:---|:---|:---|:---|
| Tantalum | CID002842 | Jiangxi Tuohong New Raw Material | CHINA | Conformant |
| Tin | CID002844 | HuiChang Hill Tin Industry Co., Ltd. | CHINA | Conformant |
| Tin | CID003116 | Guangdong Hanhe Non-Ferrous Metal Co., Ltd. | CHINA | Conformant |
| Tin | CID003190 | Chifeng Dajingzi Tin Industry Co., Ltd. | CHINA | Conformant |
| Tin | CID003325 | Tin Technology & Refining | UNITED STATES OF AMERICA | Conformant |
| Tin | CID003387 | Luna Smelter, Ltd. | RWANDA | Conformant |
| Tin | CID003397 | Yunnan Yunfan Non-ferrous Metals Co., Ltd. | CHINA | Conformant |
| Tungsten | CID003407 | Lianyou Metals Co., Ltd. | TAIWAN, PROVINCE OF CHINA | Conformant |
| Tungsten | CID003417 | Hubei Green Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID003449 | PT Mitra Sukses Globalindo | INDONESIA | Conformant |
| Tungsten | CID003468 | Cronimet Brasil Ltda | BRAZIL | Conformant |
| Tin | CID003524 | CRM Synergies | SPAIN | Conformant |
| Tin | CID003582 | Fabrica Auricchio Industria e Comercio Ltda. | BRAZIL | Conformant |
| Tungsten | CID003609 | Fujian Xinlu Tungsten Co., Ltd. | CHINA | Conformant |
| Tin | CID003868 | PT Putera Sarana Shakti (PT PSS) | INDONESIA | Conformant |
| Tungsten | CID003993 | Tungsten Vietnam Joint Stock Company | VIET NAM | Conformant |
| Tin | CID004065 | Mining Minerals Resources SARL | CONGO, DEMOCRATIC REPUBLIC OF THE | Conformant |
| Tungsten | CID004397 | Lianyou Resources Co., Ltd. | TAIWAN, PROVINCE OF CHINA | Conformant |
| Tin | CID004403 | Takehara PVD Materials Plant / PVD Materials Division of MITSUI MINING & SMELTING CO., LTD. | JAPAN | Conformant |
| Tungsten | CID004430 | Shinwon Tungsten (Fujian Shanghang) Co., Ltd. | CHINA | Conformant |
| Tin | CID004434 | Malaysia Smelting Corporation Berhad (Port Klang) | MALAYSIA | Conformant |
| Tungsten | CID004619 | Kenee Mining Corporation Vietnam | VIET NAM | Conformant |
| Tin | CID004724 | Woodcross Smelting Company Limited | UGANDA | Conformant |
| Tin | CID004754 | Global Advanced Metals Greenbushes Pty Ltd. | AUSTRALIA | Conformant |
| Tin | CID005067 | PT Arsed Indonesia | INDONESIA | Conformant |
| Tin | CID005189 | P Kay Metal, Inc | UNITED STATES OF AMERICA | Conformant |

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