# EDGAR Filing Document

**Accession Number:** 0000785786
**File Stem:** 0000785786-26-000035
**Filing Date:** 2026-5
**Character Count:** 29577
**Document Hash:** e896eb1ed461341c152167546e3cdf3a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000785786-26-000035.hdr.sgml**: 20260527

**ACCESSION NUMBER**: 0000785786-26-000035

**CONFORMED SUBMISSION TYPE**: SD

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260527

**DATE AS OF CHANGE**: 20260527

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PLEXUS CORP
- **CENTRAL INDEX KEY:** 0000785786
- **STANDARD INDUSTRIAL CLASSIFICATION:** PRINTED CIRCUIT BOARDS [3672]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 391344447
- **STATE OF INCORPORATION:** WI
- **FISCAL YEAR END:** 1003

**FILING VALUES:**
- **FORM TYPE:** SD
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14423
- **FILM NUMBER:** 261026565

**BUSINESS ADDRESS:**
- **STREET 1:** PLEXUS CORP
- **STREET 2:** ONE PLEXUS WAY
- **CITY:** NEENAH
- **STATE:** WI
- **ZIP:** 54956
- **BUSINESS PHONE:** 9209696000

**MAIL ADDRESS:**
- **STREET 1:** PLEXUS CORP
- **STREET 2:** ONE PLEXUS WAY
- **CITY:** NEENAH
- **STATE:** WI
- **ZIP:** 54956

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM SD**

**Specialized Disclosure Report**

**____________________________________________________________________________________________________________________________________**

![plxslogosda.gif](plxslogosda.gif)

**PLEXUS CORP.**

**(Exact name of registrant as specified in its charter)**

**____________________________________________________________________________________________________________________________________**

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| | | |
|:---|:---|:---|
| **Wisconsin** | **001-14423** | **39-1344447** |
| (State or other jurisdiction<br> of incorporation) | (Commission <br>File Number) | (IRS Employer Identification No.) |

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<u>One Plexus Way</u>

<u>Neenah, Wisconsin 54956</u> <br>(Address of principal executive offices) (Zip Code)

Angelo M. Ninivaggi

Executive Vice President, Chief Legal and Public Affairs Officer

<u>(920) 969-6000</u>

(Name and telephone number, including area code,

of the person to contact in connection with this report.)

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:

[X] &nbsp;&nbsp;&nbsp;&nbsp;Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from <u>January 1 to December 31, 2025</u>.

[ ] &nbsp;&nbsp;&nbsp;&nbsp;Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13q-1) for the fiscal year ended ___________.

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**Section 1 - Conflict Minerals Disclosure**

**Item 1.01**&nbsp;&nbsp;&nbsp;&nbsp;**Conflict Minerals Disclosure and Report**

<u>Conflict Minerals Disclosure</u>

A copy of Plexus Corp.'s Conflict Minerals Report for the reporting period from January 1 to December 31, 2025, is provided as Exhibit 1.01 hereto and is publicly available on our website at www.plexus.com.

**Item 1.02**&nbsp;&nbsp;&nbsp;&nbsp;**Exhibit**

See Item 3.01 of this Form.

**Section 2 – Resource Extraction Issuer Disclosure** 

**Item 2.01 Resource Extraction Issuer Disclosure and Report**

Not applicable.

**Section 3 – Exhibits** 

**Item 3.01 Exhibits**

<u>[Exhibit 1.01 - Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form.](a2025exhibit101cmr.htm)</u>

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**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.

---

| | | |
|:---|:---|:---|
| Date: May 27, 2026 |  | PLEXUS CORP. |
|  |  | (Registrant) |
|  | By: | <u>/s/ Angelo M. Ninivaggi</u> |
|  |  | Angelo M. Ninivaggi  |
|  |  | Executive Vice President, Chief Legal and Public Affairs |
|  |  | Officer |

---

## Exhibit 1.01

**EXHIBIT 1.01**

CONFLICT MINERALS REPORT OF

**PLEXUS CORP.**

IN ACCORDANCE WITH RULE 13p-1

UNDER THE SECURITIES EXCHANGE ACT OF 1934

FOR THE REPORTING PERIOD FROM

JANUARY 1 TO DECEMBER 31, 2025

**Introduction**

This Conflict Minerals Report (the "Report") of Plexus Corp. ("Plexus," the "Company," "we," "us," or "our") has been prepared by management for calendar year 2025 under the Securities Exchange Act of 1934 (the "Act"). The term "conflict mineral" is defined as (A) columbite-tantalite (coltan), cassiterite, gold, wolframite or their derivatives, which are limited to tantalum, tin and tungsten; or (B) any other mineral or its derivatives determined by the Secretary of State to be financing conflict in the Democratic Republic of the Congo (the "DRC") or an adjoining country (collectively, the "Covered Countries"). Numerous terms in this Report are defined in Rule 13p-1 of the Act and Form SD (collectively, the "Conflict Minerals Rule") and the reader is referred to those sources, and also to Securities and Exchange Commission ("SEC") Release No. 34-67716 (August 22, 2012) under the Act for such definitions. For the purpose of this report, tin, tungsten, tantalum, and gold will collectively be referred to as the 3TGs.

In accordance with the Conflict Minerals Rule, we undertook efforts to determine whether the 3TGs necessary to the functionality or production of products that we manufacture, or contract to manufacture, were sourced from the Covered Countries, or are from recycled or scrap sources. We designed our due diligence efforts to conform, in all material respects, with the framework presented by the Organisation for Economic Co-operation and Development (the "OECD") in the publication Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas and related supplements for each of the conflict minerals (collectively, the "OECD Guidance").

The statements below are based on the due diligence activities performed to date and on the information available at the time of this filing. Factors that could affect the accuracy of these statements include, but are not limited to, incomplete supplier data or a lack of available smelter data, errors or omissions by suppliers or smelters, evolving confirmation of smelters, incomplete information from industry or other third-party sources, and other issues.

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**About Plexus**

At Plexus, we help create the products that build a better world. Our vision is rooted in the well-being and inclusive engagement of our team members, customers and communities - because people are the heart of who we are and what we do. Guided by our values, we strive to make a meaningful impact every day.

By embracing innovative excellence, we pride ourselves on designing, manufacturing and servicing some of the world's most transformative products. From life-saving medical devices and mission-critical aerospace and defense products to industrial automation systems and semiconductor capital equipment, we are proud to partner with our customers to bring their most complex ideas to market. Built on the notion of people working together to solve complex challenges, we are relentless in our pursuit of excellence, environmental sustainability and the well-being of every individual impacted by our operations.

**Description of Products**

We do not sell "Plexus-branded" products. We provide services for original equipment manufacturers ("OEMs") with a focus on serving markets consisting of highly complex products and demanding regulatory environments characterized by unique flexibility, technology, quality and regulatory requirements. The products falling within the scope of this Report include the assemblies and products that we manufactured or contracted to manufacture for customers in the aforementioned market sectors during calendar year 2025. As an Electronic Manufacturing Services (EMS) company, it's highly likely that most products assembled contain tin, tungsten, tantalum and/or gold. Although we did not find any evidence that the 3TGs contained in these assemblies or products directly or indirectly benefited armed groups in the Covered Countries, we were unable to conclude that any of these assemblies and products were definitively "DRC conflict free".

**Conflict Minerals Policy**

Our commitment to ethical sourcing is driving a focus on continuous improvement in our supply chain transparency efforts. We have a Conflict Minerals Policy Statement (the "Conflict Minerals Policy"), which is posted on our website at www.plexus.com.

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**Reasonable Country of Origin Inquiry ("RCOI")**

We conducted a good faith RCOI regarding the 3TGs in the materials, components and finished goods supplied to us. We utilized a third-party service provider (the "Provider") to assist in supplier outreach and our due diligence procedures.

We reviewed the assemblies and products that we manufactured or contracted to manufacture for customers during calendar year 2025 and identified suppliers that supply components or products, or engage in manufacturing activities, that are likely to contain one or more of the 3TGs. We removed from the list of suppliers all service providers, indirect materials suppliers, distributors and inactive suppliers that did not supply goods to us.

The Provider conducted the supplier survey portion of the RCOI. Suppliers received a communication describing the compliance requirements and requesting information on the 3TGs in their products and the smelters or refiners of those minerals. The Provider, on our behalf, utilized version 6.5 of the Responsible Mineral Initiative's (the "RMI") Conflict Minerals Reporting Template ("CMRT"). The Provider, on our behalf, engaged 2,161 suppliers determined to be in scope for purposes of our RCOI efforts to collect information regarding the presence and sourcing of 3TGs in the products supplied to us.

The Provider followed up with all unresponsive suppliers through a defined process. The Provider utilized both automated and direct email communications as well as phone calls to non-responsive suppliers during the escalation phases. Escalation emails for nonresponsive suppliers were also sent directly by our Supply Chain leadership. The communications offered assistance and further information to suppliers about the requirements of the Conflict Minerals Rule and our compliance program. A minimum of eight attempts were made in an effort to contact unresponsive suppliers. Additionally, our program continues to include automated data validation on all submitted CMRTs. Suppliers were contacted to address incomplete data and invalid submissions and they were encouraged to re-submit with a valid CMRT. The goal of this process is to increase the accuracy of submissions and identify any contradictory answers in the CMRT. The Provider monitored and tracked all invalid or incomplete supplier submissions.

Although we requested information at a product level, the majority of suppliers provided CMRT responses at a company or division level that included information on all products sold by the supplier to its customers, even though we may have purchased only a limited subset of components or products from the supplier. Therefore, the information provided by these suppliers was not necessarily limited to smelters or refiners that were part of our direct supply chain.

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Based on the responses gathered during our RCOI, we were unable to determine that the 3TGs necessary to the functionality or production of our products did not originate in the Covered Countries. As a result, and in accordance with the Conflict Minerals Rule, we undertook the due diligence measures described below on the source and chain of custody of the conflict minerals in our supply chain.

**Design of Due Diligence**

As previously disclosed, our due diligence measures were designed to be in conformance, in all material respects, with the internationally recognized due diligence framework as set forth in the OECD Guidance.

The design of our due diligence measures considered the OECD's recommendations for "downstream" actors with no direct relationships with smelters or refiners. "Downstream" refers to the supply chain from smelters or refiners to retailers and manufacturers, whereas "upstream" refers to the supply chain from the mines to the smelters or refiners.

We do not have a direct relationship with any smelters or refiners and therefore, do not perform direct audits of the due diligence practices of these entities. We instead rely on internationally-recognized validation schemes that facilitate independent third-party audits of smelters or refiners and validate that smelters or refiners have met the requirements of the OECD Guidance, such as the RMI Responsible Minerals Assurance Process ("RMAP"). We support this program through membership and participation in the RMI as an active member of the Responsible Business Alliance ("RBA") since 2014. This engagement and the contributions made have helped develop standards, best practices, and tools that benefit all companies working to end the link between 3TGs and conflict in the DRC.

**Due Diligence Measures Performed** 

Our overall conflict minerals program is based on the five-step framework of the OECD Guidance. We followed the five-step framework established by the OECD Guidance while performing our due diligence measures for calendar year 2025, which consisted of the following steps:

Step 1: Maintain strong company management systems

Step 2: Identify and assess risk in the supply chain

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

Step 4: Carry out independent third-party audits of smelters' and refiners' due diligence practices when required

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Step 5: Report annually on supply chain due diligence

***Step 1: Maintain strong company management systems***

<u>Internal team:</u>

We have established an internal management system reporting through the Corporate Compliance Officer designed to assist in complying with the Conflict Minerals Rule. As previously discussed, we also retained the services of the Provider to assist with our efforts. Through use of the Provider's web-based reporting tool we are able to collect and store supplier data and CMRTs, communicate with suppliers, and monitor Conflict Minerals sourcing risks in our supply chain. The use of this tool and our other management systems has provided an opportunity for us to assist our suppliers in understanding our expectations and requirements in an effort to increase the rate and accuracy of responses received from our suppliers.

<u>Control Systems:</u>

Our Conflict Minerals Policy outlines the expectation that all of our suppliers abide by the requirements of our Supplier Code of Conduct, which prohibits human rights abuses and unethical practices. The Conflict Minerals Policy also requires all suppliers to comply with applicable legal standards and requirements and provide us with completed conflict minerals declarations annually.

We periodically review our Conflict Minerals Policy and will make updates as necessary and appropriate. If a supplier fails to comply with our Conflict Minerals Policy, we may reconsider our willingness to continue to partner with that supplier.

<u>Supplier Engagement:</u>

In an effort to strengthen engagement with suppliers, we utilized version 6.4 of the CMRT and the Provider's web-based reporting tool for collecting CMRTs from our supplier base. The use of these tools and our other engagement efforts, have allowed us to assist our suppliers in understanding our expectations.

We continue to put a strong emphasis on supplier education and training. To accomplish this, we utilized our Provider's learning management system and provided all in-scope suppliers access to their conflict minerals training material and courses. All suppliers are encouraged to complete all modules within this course. Supplier education is also done through one-on-one interaction with our Provider's supplier teams.

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During the 2025 reporting period we continued to emphasize the need for product level responses from suppliers by requesting CMRTs that only include the parts that are sold to us. In particular, this was requested for suppliers who identified risks or gaps in their company level CMRT.

<u>Company Level Grievance Mechanism:</u>

As an additional means of communication regarding conflict minerals, our employees and other stakeholders can escalate concerns to our Corporate Compliance Officer and executive management by use of our Ethics Hotline, as outlined in our Code of Conduct and Business Ethics, available on our website at www.plexus.com. Reporters can remain anonymous if desired.

<u>Document Retention:</u>

We are retaining supporting documentation regarding our conflict minerals program for calendar year 2025 in accordance with our record retention guidelines.

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

We performed multiple steps in an effort to ensure that risks were identified and assessed during the execution of our conflict minerals program. This included risks associated with smelters or refiners, supplier responses, and with suppliers' internal policies and programs.

The Provider verified whether the metals processors identified by each supplier on its CMRT are actually smelters, refiners, or recyclers of conflict minerals ("legitimate smelters or refiners") by comparing the facilities reported by suppliers to the RMI's most current Standard Smelter List, the data gathered by the U.S. Department of Commerce, and by conducting its own independent research. The Provider also researched and reviewed mine information for all verified smelters or refiners in an effort to determine the country of origin of the minerals processed. Through this effort, we were able to identify 100% of the country of origin information for the smelters or refiners.

The Provider attempted to match each identified smelter or refiner to available lists of smelters and refiners that were identified as "conformant" by internationally-recognized validation schemes, such as the RMAP. If a smelter or refiner was not certified by an internationally-recognized scheme, the Provider attempted to contact the entity to gather more information about its sourcing practices. In addition, the Provider also performed research using publicly available sources of information regarding the smelter's or refiner's sourcing practices. The conformant

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status of each legitimate smelter or refiner is continuously monitored to ensure that any changes in status or risk are accounted for.

We sought to understand the risk levels associated with conflict minerals in the supply chain. A smelter's or refiner's overall risk is based on various factors, including whether the smelter has been identified as "valid" and has an associated Smelter Identification Number (under the RMI, this is known as a CID), as well as the smelter's geographic location, including its proximity to the Covered Countries and any credible evidence of unethical or conflict sourcing.

The Provider assessed supplier risk based on its determination of the likelihood that a supplier provided conflict minerals to us that may have originated from sources that are not conflict free, considering the smelters or refiners declared by that supplier on its CMRT.

Additionally, we evaluated suppliers based on the strength of their conflict minerals programs. The criteria used to evaluate the strength of a supplier's program consisted of the following questions on the CMRT:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;&nbsp;Have you established a conflict minerals sourcing policy?

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;&nbsp;Have you implemented due diligence measures for conflict-free sourcing?

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;&nbsp;Do you review due diligence information received from your suppliers against your company's expectations?

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•&nbsp;&nbsp;&nbsp;&nbsp;Does your review process include corrective action management?

Tracing materials back to their mine of origin is a complex aspect of responsible sourcing in the supply chain. We have determined that seeking information about conflict minerals smelters and refiners in the supply chain represents the most reasonable effort we can make to determine the mines or locations of origin of the conflict minerals in the supply chain. This was done by adopting the methodology outlined by the OECD Guidance and by requiring suppliers to conform with the same standards to meet the OECD Guidance, and report to us using the CMRT. Through this process, we believe we have made reasonable efforts to determine the mines or locations of origin of the conflict minerals in our supply chain.

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

Following the assessment of supplier risk discussed above, we followed up with suppliers whom we had reason to believe may be sourcing conflict minerals originating from a smelter or refiner in the Covered Countries. We also followed up with any supplier that did not submit a valid response to the CMRT and encouraged them to provide complete and accurate data via the CMRT.

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As stated in our Conflict Minerals Policy, we require all in-scope suppliers to provide completed conflict minerals declarations using the CMRT. We may reconsider our willingness to partner with suppliers that fail to comply with our Conflict Minerals Policy.

As part of our risk management plan under the OECD Guidance, any high-risk smelter facilities reported on a CMRT by one of the suppliers surveyed, risk mitigation activities were initiated. Through the Provider, submissions that include any high-risk smelter facilities immediately received instructions from us asking the supplier to take their own risk mitigation actions. The mitigation actions may include the submission of a product specific CMRT to better identify the connection to products that they supply to us, escalating up to the removal of these smelters from their supply chain.

During the 2025 reporting year, we conducted a targeted campaign to all suppliers who indicated one or more smelters of concern in an effort to educate them on the level of risk and suggested next steps. Various training materials, including webinars, were offered to suppliers for additional smelter education and awareness.

As per the OECD Due Diligence Guidance, risk mitigation will depend on the supplier's specific context. Suppliers are given clear performance objectives within reasonable timeframes with the ultimate goal of progressive elimination of these risks from the supply chain. Furthermore, suppliers are guided to our Provider's learning management system to engage in educational materials on mitigating the risk of smelters or refiners in the supply chain.

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

We rely on multi-stakeholder initiatives that provide verification processes for smelters or refiners who provide conflict minerals to companies in its supply chain. We, as a purchaser of component parts, are many steps removed from the mining of conflict minerals. We do not purchase raw ore or unrefined conflict minerals and we do not conduct purchasing activities directly in the Covered Countries. In addition, we do not perform or direct audits of the smelters or refiners listed by our suppliers as being potentially a part of our supply chain.

Through our membership with the RMI, we encourage smelters or refiners to participate in the RMAP.

The Provider also directly contacts smelters and refiners that are not currently enrolled in the RMAP to encourage their participation and gather information regarding each facility's sourcing

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practices on behalf of its compliance partners. We are a signatory of this communication in accordance with the requirements of downstream companies detailed in the OECD Guidance.

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

This Report (and the related Form SD) was filed with the SEC and is available on our website at www.plexus.com.

**Due Diligence Results**

Using the processes outlined above, we surveyed the in-scope suppliers for calendar year 2025 and reviewed the responses received. As previously noted, we, along with the Provider, followed up with suppliers who did not respond or who provided incomplete responses, or whose responses contained inconsistencies, in an effort to secure valid and complete responses. As an electronic manufacturing services company, a large majority of suppliers that comprise our supply chain are dictated by our customers. For the 2025 reporting year, we successfully collected CMRT's covering 100% of the parts and materials within Plexus's direct sourcing control.

As a result of our due diligence measures in 2025, we have identified 340 smelters and refiners as potentially processing the 3TGs provided by our suppliers. Of the 340 smelters and refiners, 209 were identified as RMI conformant, with an additional 9 pursuing their RMI certification. There were a total of 38 smelters not conformant to RMAP. Each of those 38 smelters received a letter from us to educate them on the RMI process as well as encouraging them to join the RMAP and become a RMI conformant facility. Additionally they were encouraged to attend training to better help them understand the process. Plexus was able to obtain country of origin data for 100% of the identified smelters.

As previously disclosed, we do not do business directly with any of the smelters or refiners identified. The list was generated based on information received from our suppliers. We continue to conduct independent research on smelters and refiners and will work with suppliers throughout our supply chain to help improve and refine reported information in future years. We will continue to communicate expectations and information requirements to our direct suppliers. We will continue to make inquiries to direct suppliers and undertake additional risk assessments when potentially relevant changes in facts or circumstances are identified.

Although we requested information at a product level, as previously disclosed, a majority of suppliers returned information at a company or division level, not at a product level. Therefore,

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the information provided was not necessarily limited to smelters or refiners confirmed to be in our supply chain and we are unable to determine whether any of these smelters are financing conflict in the Covered Countries. We will continue to work with our suppliers to determine if these smelters or refiners can be directly linked to the actual parts or products sold to us. Due to the submission of company level responses, we cannot make this determination at this time.

In addition, various supplier responses were incomplete, as all supply chain participants continue to map their upstream supply chains. As a result, we are unable to definitively validate whether facilities actually processed the minerals contained in our products or whether all upstream supply chain participants were identified.

**Steps to Continuously Improve Due Diligence**

In addition to the initiatives outlined above, we plan to take the following steps during the next compliance period to continue to improve the due diligence conducted and to further mitigate the risk that these conflict minerals benefit armed groups:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to actively participate in and support industry trade groups to help improve communication throughout the supply chain. We are an active member of the RBA, and will continue our membership activity through the coming year.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to leverage our customer partnerships to proactively guide suppliers on our consistent expectations for responsible sourcing.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to support supplier education and training and integrate Conflict Minerals related expectations into new supplier agreements and our existing supplier performance evaluations.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Evaluate the suppliers and parts surveyed during this year's Conflict Minerals outreach to ensure accurate data and scoping year-over-year, eliminating out-of-scope suppliers and validating our supplier contact information to increase responsiveness.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Evaluate suppliers that do not comply with our Conflict Minerals Policy or have not made improvements to their conflict minerals programs, offer an educational outreach program through our Provider, and further communicate our expectation that they make efforts to comply with our Conflict Minerals Policy.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Continue to evaluate the suppliers that have provided smelters or refiners on the previously mentioned high risk smelters list and require smelter diligence training for those suppliers. This training is specifically designed for those suppliers that have reported high risk smelters in consecutive reporting years. Its intent is to continue to educate the suppliers on where they can find additional resources, as well as to

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communicate the continued expectation that they work through their supply chains to remove high risk smelters from their CMRTs.