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NOTICE OF ANNUAL MEETING

OF SHAREHOLDERS

on February 12, 2020

December 17, 2021

To the Shareholders of Plexus Corp.:

You are invited to the Annual Meeting of Shareholders of Plexus Corp. will hold its annual meeting of shareholders at the Waldorf Astoria Chicago, 11 East Walton Street, Chicago, Illinois 60611, on Wednesday, February 12, 2020, at 8:00 a.m. local time, for the following purposes:

, a Wisconsin corporation:

​	(1)	To elect 11 directors to serve until the next​	​	DATE AND TIME February 16, 2022 8:00 a.m. CST	​	​	ITEMS OF BUSINESS				​
​		​	​		​	​		​	​		​
​		​	​	ACCESS THE VIRTUAL ANNUAL MEETING This year’s annual meeting will be held virtually. Shareholders may participate in the virtual annual meeting by logging in at the following link and until their successors have beenproviding the control number found in the Notice of Internet Availability of Proxy Materials: http://www.virtualshareholdermeeting.com/PLXS2022	​	​	1	​	​	Elect 10 Directors (pg. 9)	​
						​		​	​		​
						​	2	​	​	Approve executive compensation by an advisory vote (pg. 68)	​
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​		​	​		​	​		​	​		​
​		​	​	RECORD DATE Shareholders of record at the close of business on December 13, 2021, are entitled to attend and vote at the annual meeting by virtual presence online. As of the Record Date, Plexus had 28,009,600 shares of common stock outstanding. Each outstanding share of common stock is entitled to one vote on each matter presented. Any shareholder entitled to vote may vote either at the virtual meeting or by duly elected.

authorized proxy.

(2)​

To ratify​

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Ratify the selection of PricewaterhouseCoopers LLP as Plexus’our independent auditors for fiscal 2020. (pg. 71)

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(3)

To hold an advisory vote to approve the compensation of the Company’s named executive officers, as disclosed in “Compensation Discussion and Analysis” and “Executive Compensation” in the proxy statement. ​

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​	(4) 4	To transact​	​	Transact such other business as may properly come before the meeting or any adjournment thereof.	​
​		​	​		​

All shareholders of record at the close of business on December 5, 2019, will be entitled to vote at the meeting or any adjournment of the meeting. On or about December 13, 2019, we expect to mail shareholders a Notice of Internet Availability of Proxy Materials containing instructions on how to access our proxy statement and annual report, as well as vote, online.

We call your attention to the proxy statement accompanying this notice, which contains important information about the matters to be acted upon at the meeting.

By Order of the Board of Directors,

Angelo M. Ninivaggi

Executive Vice President, Chief Administrative Officer,

General Counsel and Secretary

Important notice regarding the availability of proxy materials for the shareholder meeting to be held on February 16, 2022. The proxy statement and the Company’s 2021 annual report are available at www.proxyvote.com. At www.proxyvote.com, shareholders can view the proxy material, vote and request to receive paper copies of the proxy materials by mail.

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Table of Contents

Who We Are	1
By order Meeting & Voting Information	3
Items of theBusiness	5
Security Ownership of Certain Beneficial Owners & Management	7
Proposal 1 – Election of Directors	9
Corporate Governance	18
Plexus Corp. Board of Directors	18
Shareholder Protections & Corporate Governance Best Practices	18
Board Composition & Structure	19
Angelo M. Ninivaggi Board & Committee Responsibilities	21
Executive Vice President, Chief Administrative Officer, General Counsel and Secretary Board Governance Processes	23
Director Compensation for Fiscal 2021	25
Director Fees & Arrangements	26
Stock Ownership Guidelines & Stock Compensation for Directors	26
Director Participation in Deferred Compensation Plan	27
Board’s Role in Risk Oversight	28
Environmental, Social & Governance (ESG)	29
Compensation Discussion & Analysis	31
Executive Summary	31
Executive Compensation Philosophy, Goals & Process	33
Elements & Analysis of Direct Compensation	36
Elements & Analysis of Other Compensation	48
Compensation Committee Report	51
Executive Compensation	52
Summary Compensation Table for Fiscal 2021	52
Grants of Plan-Based Awards for Fiscal 2021	55
Outstanding Equity Awards at Fiscal 2021 Year-End	56
Option Exercises & Stock Vested in Fiscal 2021	58
Nonqualified Deferred Compensation in Fiscal 2021	58
Employment Agreements & Potential Payments	60
Pay Ratio Disclosure	66
Compensation & Risk	67
Proposal 2 – Advisory Vote on Executive Compensation	68
Certain Transactions	69
Report of the Audit Committee	70
Proposal 3 – Ratify Independent Auditors	71
Fees & Services	71
Householding & Solicitation	72

​		​	​		​
​	Index of frequently accessed information				​
​	Beneficial Owners	​	​	7	​
​	Board’s Role in Risk Oversight	​	​	28	​
​	Certain Transactions	​	​	69	​
​	Compensation & Risk	​	​	67	​
​	Compensation Committee Report	​	​	51	​
​	Compensation Discussion & Analysis	​	​	31	​
​	Corporate Governance	​	​	18	​
​	Director Compensation for Fiscal 2021	​	​	25	​
​	Environmental, Social & Governance	​	​	29	​
​	Executive Compensation	​	​	52	​
​	Householding & Solicitation	​	​	72	​
​	Items of Business	​	​	5	​
​	Meeting & Voting Information	​	​	3	​
​	Pay Ratio Disclosure	​	​	66	​
​	Proposal 1	​	​	9	​
​	Proposal 2	​	​	68	​
​	Proposal 3	​	​	71	​
​	Report of the Audit Committee	​	​	70	​
​	Who We Are	​	​	1	​

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WHO WE ARE

Our Vision	​	​	Our Mission
We’ll help you create the products that build a better world.	​	​	The leader in highly complex products and demanding regulatory environments.

Plexus by the Numbers

$3.37B	​	​	15.4%	​	​	$4.76	​	​	$1.2M
2021 Revenue	​	​	2021 ROIC	​	​	2021 Earnings per share	​	​	Planned investment in energy use reduction technology and initiatives in F22
	​	​		​	​		​	​
19,200	​	​	600	​	​	26/7	​	​	4.5M
Employees	​	​	Development Engineers	​	​	Facilities / Countries	​	​	Square Feet

Plexus Market Sectors & Subsectors

INDUSTRIAL	​	​	HEALTHCARE / LIFE SCIENCES	​	​	AEROSPACE / DEFENSE
Automation and Robotics	​	​	Medical Devices and Equipment	​	​	Aerospace
Transportation and Energy Management	​	​	Life Sciences and Diagnostics	​	​	Defense
Semiconductor and Test and Measurement	​	​	Advanced Surgical Systems and Medical Robotics	​	​	Security
					​	Space
Communications	​	​		​	​

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WHO WE ARE

Our People

We recognize that a great culture is foundational to the success of our vision to create the products that build a better world. We are proud of our culture and the recognition we have received over the years as a great place to work. In building a great culture, we embrace four “non-negotiables:”

​		​	​	Our Values and Leadership Behaviors - Our Values and Leadership Behaviors establish the foundation upon which our culture is built; Customer Focus, Relationships and Teamwork, Excellence, Open Communications, Integrity, Prioritize our People, Solve Problems, Be Courageous, Be Strategic and Innovate.	​
​		​	​	Quality Begins with Me - We instill personal responsibility for quality in our employees through our Quality Begins with Me culture; a commitment to delivering zero defects and continuous improvement.	​
​		​	​	5E’s of Customer Service Excellence - In all aspects of our engagements with both internal and external customers, we reflect the 5E’s. We are Empathetic, Entrepeneurial, Empowered, Engaged and we Ensure Accountability.	​
​		​	​	One Plexus - One Plexus reflects our sentiment that we are stronger together than the sum of our parts. We embrace the One Plexus mentality through collaboration to ensure consistent operations, globally, and leverage the strengths and best practices of all facets of the organization to drive the best solutions for our customers.	​

Committed to a diverse and inclusive workplace

​	Diversity and Inclusion (“D&I”) Statement	​	​	Be you. Our people create our best Plexus. Ingrained in our culture of inclusion is the philosophy that each individual offers diverse perspectives, backgrounds and experiences that create great outcomes when we are united as a team. We respect our people and embrace our differences. We welcome everyone and value the ideas generated by our collective uniqueness. We aspire that all of our people reach their full potential.							​
​	Employee Resource Groups	​	​		​	​		​	​		​
			​	Plexus Young Professionals (PyP) Fosters development and collaboration for young professionals.	​	​	Women in Network (WiN) Champions the advancement of women in professional and personal development.	​	​	UnusPlexus Created to celebrate different cultures and diversity at Plexus.	​
​	D&I Highlights	​	​	• D&I Committee (including the CEO) and Board Oversight of D&I initiatives and results							​
			​	• Formal mentorship program with a specific focus on future leaders within underrepresented populations and D&I leadership training provided							​
			​	• Gender & underrepresented minorities recruitment strategy							​
			​	• Flexible workplace policy, paid parental leave & equitable pay practices							​
			​	• Community involvement, charitable match program & paid volunteer time off							​

Diversity by the Numbers

14	​	​	49.9%	​	​	2	​	​	3
different home countries represented in our global workforce	​	​	of our global workforce is female	​	​	of 16 of our Plexus Leadership Team members are female	​	​	of 10 directors are female or underrepresented minorities

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PROXY STATEMENT

Plexus Corp.

Global Headquarters

One Plexus Way

Neenah, Wisconsin

WI 54957-0156

MEETING AND VOTING INFORMATION

Plexus Corp. will hold its annual meeting of shareholders virtually on February 16, 2022 at 8 a.m. CST.

How to Access Your Proxy Materials

On or about December 9, 2019

You20, 2021, we mailed to shareholders a Notice of Internet Availability of Proxy Materials (“Notice”) containing instructions on how to access our proxy materials, including our proxy statement and annual report, and how to vote via the internet. Shareholders will not receive printed copies of the proxy materials unless requested via the procedures described in the Notice. To assure timely delivery of printed copies of the proxy materials before the annual meeting, shareholders need to request a copy no later than January 26, 2022.

How to Vote

Shareholders of record at the close of business on December 13, 2021 (the “Record Date”), are entitled to participate and vote at the virtual annual meeting. As of the Record Date, Plexus had 28,009,600 shares of common stock outstanding. If you are a shareholder of record as of the Record Date, then you may vote either at the virtual annual meeting or in personadvance of the meeting by authorizing—by internet, telephone or by using amail—the persons named as proxies on the proxy card, Dean A. Foate, Todd P. Kelsey, Patrick J. Jermain and Angelo M. Ninivaggi, to vote your shares in accordance with your directions. We encourage you to vote as follows:

soon as possible, even if you are planning to attend the virtual annual meeting (by virtual presence online), so that the vote count will not be delayed.

​		​
•  ​	By internet: internet	​	​	Go to www.proxyvote.com. Please have the notice we sent to you in hand because it has the personalYou will need your 16-digit control number needed for your vote. included on the Notice in order to vote by Internet.	​
​		​	​	By telephone	​	​	On a touch-tone telephone, call 1-800-690-6903. You will need your 16-digit control number included on the Notice in order to vote by telephone.	​
•  ​		​	​	By telephone: mail	​	Call1-800-690-6903 on a touch-tone telephone. Please have the notice we sent to you in hand because it has the personal control number needed for your vote.
​
•  By mail:		Please request written materials as provided on page 1 ofby following the proxy statement.instructions in the Notice. Complete, sign and date the proxy card, and return it to the address indicated on the proxy card.	​
​		​	​	Virtually	​	​	If you attend the virtual annual meeting, you will be able to cast your vote via the online meeting platform during a designated portion of the meeting. Have your Notice, proxy card or proxy form with your 16-digit control number available when you access the virtual annual meeting.	​

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Ratification

Q:    WHO CAN ATTEND THE ANNUAL MEETING?

A:    All shareholders of record as of the close of business on the Record Date, or their proxy holders or the underlying beneficial owners of the common stock, may attend the meeting. However, seating is limited and will be on a first arrival basis. To attend the annual meeting, please follow these instructions:

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Q:    CAN I CHANGE MY VOTE AFTER I RETURN OR SUBMIT MY PROXY?

A:    Yes. Even after you have submitted your proxy, the proxy may be revoked at any time prior to voting either by written notice filed with the secretary, or acting secretary, of the meeting or by oral notice to the presiding officer during the meeting. Presence at the annual meeting by a shareholder who has appointed a proxy does not in itself revoke a proxy.

If a broker, bank or other nominee holds your shares and you wish to change your proxy prior to the voting thereof, please contact the broker, bank or other nominee to determine whether, and if so how, such proxy can be revoked.

Q:    MAY I VOTE AT THE ANNUAL MEETING?

A:    If you complete a proxy card or vote via the internet or by telephone, you may still vote in person at the annual meeting. To vote at the meeting, please either give written notice that you would like to revoke your original proxy to the secretary, or acting secretary, of the meeting or provide oral notice to the presiding officer during the meeting.

If a broker, bank or other nominee holds your shares and you wish to vote in person at the annual meeting, you must obtain a proxy issued in your name from the broker, bank or other nominee; otherwise you will not be permitted to vote in person at the annual meeting.

Q:    WHO IS MAKING THIS SOLICITATION?

A:    This solicitation is being made on behalf of Plexus by its board of directors. Plexus will pay the expenses in connection with the solicitation of proxies. Upon request, Plexus will reimburse brokers, dealers, banks and voting trustees, or their nominees, for reasonable expenses incurred in forwarding copies of the proxy material and annual report to the beneficial owners of shares which such persons hold of record. Plexus will solicit proxies by mailing a Notice of Internet Availability of Proxy Materials to all shareholders; paper copies of the proxy material will be sent upon request as provided above as well as in the Notice of Internet Availability of Proxy Materials.

Proxies may be solicited in person, or by telephone,e-mail or facsimile, by officers and regular employees of Plexus who will not be separately compensated for those services.

Q:    WHEN ARE SHAREHOLDER PROPOSALS AND SHAREHOLDER NOMINATIONS DUE FOR THE 2021 ANNUAL MEETING?

A:    The Secretary must receive a shareholder proposal no later than August 15, 2020, in order for the proposal to be considered for inclusion in our proxy materials for the 2021 annual meeting. The 2021 annual meeting of shareholders is tentatively scheduled for February 17, 2021. To otherwise bring a proposal or nomination before the 2021 annual meeting, you must comply with our bylaws, which require written notice to the Secretary between October 4, 2020, and October 29, 2020. The purpose of this requirement is to assure adequate notice of, and information regarding, any such matter as to which shareholder action may be sought. If we receive your notice after October 29, 2020, then your proposal or nomination will be untimely and will not be presented to shareholders for action at the 2021 annual meeting of shareholders.

In addition, your proposal or nomination must comply with the procedural provisions of our bylaws. If you do not comply with these procedural provisions, your proposal or nomination can be excluded. Should the board nevertheless choose to present your proposal, the named proxies will be able to vote on the proposal using their best judgment.

Q:    WHAT IS THE ADDRESS OF THE SECRETARY?

A:    The address of the Secretary is:

Plexus Corp.

Attn: Angelo M. Ninivaggi

One Plexus Way

P.O. Box 156

Neenah, Wisconsin 54957-0156

Q:    WILL THERE BE OTHER MATTERS TO VOTE ON AT THIS ANNUAL MEETING?

A:    We are not aware of any other matters that you will be asked to vote on at the annual meeting. Other matters may be voted on if they are properly brought before the annual meeting in accordance with our bylaws. If other matters are properly brought before the annual meeting, then the named proxies will vote the proxies they hold in their discretion on such matters.

For matters to be properly brought before the meeting, our bylaws require that we receive written notice, together with specified information, not less than 45 days nor more than 70 days before the first anniversary of the date in which proxy materials for the previous year’s annual meeting were first made available to shareholders. We did not receive notice of any matters by the deadline for the 2020 annual meeting, which was October 30, 2019.

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Board Nominee Overview

The composition of the board of directors is reviewed annually to ensure that an appropriate mix of skills, experiences and backgrounds is represented; the membership mix of the board may also be changed as necessary to meet business needs. Your board nominees offer a diverse range of skills and experience in relevant areas, as set forth in the matrix below. Unless otherwise noted, all directors have been employed in their principal occupation listed for the past five years or more. Each of the attributes identified, which together with the directors’ principal occupations and business experience, as well as the Company’s board member selection criteria, outlined in the next section, provide the reasons that each individual has been nominated to serve on the board.

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DR. JOANN M. EISENHART

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Name and Age

Principal Occupation, Business Experience and Education (1)

Ralf R. Böer, 71 Director since 2004

Mr. Böer has served as a Founding Partner and Director of Wing Capital Group, LLC, a private equity group, since 2008. He has also served as a Partner Emeritus of Foley Independent Executive VP & Lardner LLP, a national law firm, since retiring as a Partner in 2014, and was previously its Chairman and Chief Executive Officer. Mr. Böer’s legal practice included international and domestic acquisitions, international business transactions and licensing and technology transfers. He was a director of Fiskars Corporation, a global consumer products company, until 2015. Mr. Böer obtained a B.A. from the University of Wisconsin-Milwaukee and a J.D. from the University of Wisconsin Law School.

Stephen P. Cortinovis, 69 Director since 2003

Mr. Cortinovis is a private equity investor in Lasco Foods, Inc., a food services industry manufacturer and distributor. He was previously a Partner of Bridley Capital Partners Limited, a private equity group, and prior thereto served as President–Europe of Emerson Electric Co., a diversified global technology company. He is also a director of Aegion Corporation, a global infrastructure protection and rehabilitation company, and serves as the chair of its Strategic Planning Committee and a member of its Compensation Committee. Mr. Cortinovis obtained a B.A. and a J.D. from St. Louis University.

David J. Drury, 71 Director since 1998

Mr. Drury has served as a Founding Partner and Director of Wing Capital Group, LLC, a private equity group, since 2008. He was previously Chairman and Chief ExecutivePeople Officer, of Poblocki Sign Company LLC, an exterior and interior sign systems company, until 2015, and was also its President until 2011. In addition, Mr. Drury is a trustee of The Northwestern Mutual Life Insurance Company a financial services and insurance provider. He was a director of Journal Communications, Inc., a media holding company, until 2015. Mr. Drury earned a B.B.A. from the University of Wisconsin-Whitewater and is a Certified Public Accountant who practiced as such for 18 years.

(retired)

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Name Age: 62 Tenure: 6 years Other Public Boards: 0 Committee Assignment: Compensation & Leadership Development (Chair)

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Skills and Age Experience:

Principal Occupation, Business Experience and Education (1)​

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Global Business

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Supply Chain Management

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Dr. Joann M. Eisenhart, 60 Director since 2015 ​

Dr. Eisenhart retired as Executive Vice President​

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Technology and Chief People Officer at The Northwestern Mutual Life Insurance Company, a financial services Cybersecurity experience

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Human Capital Development and insurance provider, in October 2019 after serving in such roles since 2018. She previously served as Senior Vice President—Human Resources, Facilities and Philanthropy at Northwestern Mutual from 2013 until 2018, and as Senior Vice President—Human Resources prior thereto. Before joining Northwestern Mutual in 2011, Dr. Eisenhart served as Senior Vice President—Human Resources, Worldwide Manager and Operational Support at Pfizer Inc., a global biopharmaceutical company, and held various leadership positions at Rohm & Haas Company, a specialty chemical company, including Human Resources Director and Senior Research Scientist. She also serves on the Board of Advisors for the University of Wisconsin-Madison Department of Chemistry. Dr. Eisenhart earned a B.S. in Chemistry from the University of Illinois at Urbana-Champaign and a Ph.D. in Inorganic Chemistry from the University of Wisconsin-Madison. She also earned both a M.A. and a Ph.D. in Human and Organizational Development from Fielding Graduate University. Compensation

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Manufacturing Management

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Sales, Marketing or Innovation

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Dean​

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Environmental, Social & Governance

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Dr. Eisenhart retired as Executive Vice President and Chief People Officer at The Northwestern Mutual Life Insurance Company, a financial services and insurance provider, in 2019. Prior thereto, she served as Senior Vice President – Human Resources, Facilities and Philanthropy at Northwestern Mutual from 2013 until 2018, and as Senior Vice President – Human Resources since 2011. Dr. Eisenhart previously served as Senior Vice President – Human Resources at Pfizer Inc., a global biopharmaceutical company, and held various leadership positions at Rohm and Haas Company, a manufacturer of specialty chemicals. She earned a B.S. in Chemistry from the University of Illinois at Urbana-Champaign and a Ph.D. in Inorganic Chemistry from the University of Wisconsin-Madison. She also earned an M.A. and a Ph.D. in Human and Organizational Development from Fielding Graduate University.

DEAN A. Foate, 61 Director since 2000 Chairman since 2013 FOATE

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Mr. Foate has served as Plexus’ Chairman of the Board since 2013. Mr. Foate retired as President and Chief Executive Officer of& CEO Plexus in 2016 after serving in such roles since 2002. He joined Plexus in 1984 and held various other executive roles, including prior service as its Chief Operating Officer. Mr. Foate is also a director of Regal Beloit Corporation, a manufacturer of electric motors, electrical motion controls, power generation and power transmission products, as well as a member of its Corporate Governance & Director Affairs Committee. Mr. Foate earned a B.S. in Electrical and Computer Engineering from the University of Wisconsin-Madison and a Master of Science in Engineering Management from the Milwaukee School of Engineering. Corp. (retired)

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Age: 63 Tenure: 21 years (8 as Chairman) Other Public Boards: 1

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Skills and Experience:

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Rainer Jueckstock, 60 Director since 2013 ​

Mr. Jueckstock has served as​

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Public Company CEO/COO

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Manufacturing Management

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Financial and Accounting

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Supply Chain Management

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Global Business

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Foate is not an independent director and therefore is not eligible for membership on a Board committee under Nasdaq rules or the committees’ charters.

Mr. Foate has served as Plexus’ Chairman of the Board since 2013. Mr. Foate retired as President and Chief Executive Officer of Plexus in 2016 after serving in such roles since 2002. He joined Plexus in 1984 and held various other executive roles, including prior service as its Chief Operating Officer. Mr. Foate is also a director of Regal Beloit Corporation, a manufacturer of electric motors, electrical motion controls, power generation and power transmission products, as well as a member of its Corporate Governance & Director Affairs Committee. Mr. Foate earned a B.S. in Electrical and Computer Engineering from the University of Wisconsin-Madison and a Master of Science in Engineering Management from the Milwaukee School of Engineering.

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RAINER JUECKSTOCK

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Independent Executive Vice President ofVP, Tenneco Inc., a producer of automotive emission control and ride control products and systems, since 2018, when Tenneco acquired Federal-Mogul LLC, an automotive and industrial equipment supplier. Mr. Jueckstock has also served as President of Federal-Mogul Powertrain since 2018, after having served as Chief Executive Officer of Federal-Mogul Powertrain since 2012. Prior to Tenneco’s acquisition of Federal-Mogul LLC, he served asco-Chief Executive Officer of Federal-Mogul from 2012, asco-Chairman of the Board since 2015, and as a director since 2012. Mr. Jueckstock joined Federal-Mogul in 1990 and served in numerous operations, sales and finance leadership roles, including as Chief Executive Officer, and as Senior Vice President-Powertrain Energy and a member of Federal-Mogul’s Strategy Board. Prior to joining Federal-Mogul, he was a member of the German Military. Mr. Jueckstock earned a degree in Engineering from the Military College at Zittau, Germany.

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Age: 62 Tenure: 8 years Other Public Boards: 0 Committee Assignment: Audit (Chair)

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Skills and Experience:

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Peter Kelly, 62 Director since 2005 ​

Mr. Kelly​

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Public Company CEO/COO

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Manufacturing Management

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Financial and Accounting

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Supply Chain Management

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Global Business

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Jueckstock has served as an Executive Vice President of Tenneco Inc., a producer of automotive emission control and ride control products and systems, since 2018, when Tenneco acquired Federal-Mogul LLC, an automotive and industrial equipment supplier. Mr. Jueckstock has also served as President of Federal-Mogul Powertrain since 2018, after having served as its Chief Executive Officer since 2012. Prior to the acquisition of Federal-Mogul, he also served as its co-Chief Executive Officer and as a director since 2012, and as co-Chairman of the Board since 2015. Before joining Federal-Mogul, he was a member of the German Military. Mr. Jueckstock earned a degree in Engineering from the Military College at Zittau, Germany.

PETER KELLY

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Independent Executive Vice President and Chief Financial Officer ofVP, NXP Semiconductors N.V., a provider of high performance mixed signal

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Age: 64 Tenure: 16 years Other Public Boards: 0 Committee Assignment: Audit Governance & Sustainability

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Skills and standard semi-conductor product solutions, since 2017. Prior thereto, he served as Executive Vice President – StrategyExperience:

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Public Company CEO/COO

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Manufacturing Management

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Financial and Mergers & Acquisitions since 2015, Executive Vice President and Chief Financial Officer since 2012 and Executive Vice President and General Manager of Operations prior thereto. Mr. Kelly previously served as Vice President and Chief Financial Officer of UGI Corp., a distributor and marketer of energy products and services, and as Chief Financial Officer and Executive Vice President of Agere Systems, a semi-conductor company. He was a director of Graphic Packaging Holding Company, a provider of paper-based packaging solutions, as well as a member of its Audit Committee Accounting

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Supply Chain Management

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Global Business

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Human Capital Development and Compensation and Benefits Committee, until 2018. Mr. Kelly earned a B.S. from the University of Manchester (U.K.) Institute of Science and

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Technology and is a fellow of the Chartered Institute of Management Accountants.

Cybersecurity experience	​	​		​	​	Sales, Marketing or Innovation	​
Name and Age ​		Principal Occupation, Business Experience and Education (1)​	​	Environmental, Social & Governance	​	​		​	​		​

Mr. Kelly will serve as Executive Vice President of NXP Semiconductors N.V., a global semiconductor company and a long-standing supplier in the industry, until February 2022, when he plans to retire. Prior to announcing his retirement, he also served as the Chief Financial Officer. Mr. Kelly also previously served as Executive Vice President – Strategy and Mergers & Acquisitions since 2015, Executive Vice President and Chief Financial Officer since 2012 and Executive Vice President and General Manager of Operations prior thereto. He was a director of Graphic Packaging Holding Company, a provider of paper-based packaging solutions, as well as a member of its Audit Committee and Compensation and Benefits Committee, until 2018. Mr. Kelly earned a B.S. from the University of Manchester (U.K.) Institute of Science and Technology and is a fellow of the Chartered Institute of Management Accountants.

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TODD P. KELSEY

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President & CEO Plexus Corp.

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Todd P. Kelsey, 54 Director since 2016 Age: 56 Tenure: 5 years Other Public Boards: 1

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Mr. Kelsey has served as President​

Skills and Chief Executive Officer of Plexus since 2016. He was previously Plexus’ Executive Vice President and Chief Operating Officer from 2013 until 2016, and its Executive Vice President – Global Customer Services prior thereto. Mr. Kelsey joined Plexus in 1994 as a Design Engineer in the Company’s Engineering Solutions Group, and has held various other positions with increasing responsibility since that time, including Senior Vice President – Global Customer Services and Senior Vice President – Engineering Solutions. He is also a director of Steelcase Inc., a global provider of workplace products, furnishings and services, as well as a member of its Audit Committee and Compensation Committee. Mr. Kelsey earned a B.S. and a M.S. in electrical engineering from the University of Wisconsin-Madison and a M.B.A. from the University of Wisconsin-Oshkosh. Experience:

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Public Company CEO/COO

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Manufacturing Management

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Karen​

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Supply Chain Management

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Global Business

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Kelsey is not an independent director and therefore is not eligible for membership on a Board committee under Nasdaq rules or the committees’ charters.

Mr. Kelsey has served as President and Chief Executive Officer of Plexus since 2016. He was previously Plexus’ Executive Vice President and Chief Operating Officer from 2013 until 2016, and its Executive Vice President – Global Customer Services prior thereto. Mr. Kelsey joined Plexus in 1994 as a Design Engineer in the Company’s Engineering Solutions Group, and has held various other positions with increasing responsibility since that time, including Senior Vice President – Global Customer Services and Senior Vice President – Engineering Solutions. He is also a director of Steelcase Inc., a global provider of workplace products, furnishings and services, as well as the chair of its Audit Committee. Mr. Kelsey earned a B.S. and a M.S. in electrical engineering from the University of Wisconsin-Madison and an M.B.A. from the University of Wisconsin-Oshkosh.

RANDY J. MARTINEZ

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Independent President & CEO, MTS Systems Corp. (retired)

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Age: 66 Tenure: <1 year Other Public Boards: 0 Committee Assignment: Audit Governance & Sustainability

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Skills and Experience:

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Public Company CEO/COO

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Manufacturing Management

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Martinez served as President and Chief Executive Officer of MTS Systems Corporation, a leading global supplier of advanced test systems, motion simulators and precision sensors, until 2021. Prior thereto, Mr. Martinez served in several leadership roles at AAR Corporation, a provider of aviation services to the worldwide commercial aviation and aerospace & defense industries, including President & CEO of the Airlift Group and Group Vice President, Aviation Services. Mr. Martinez served with distinction in the U.S. Air Force for 21 years, retiring as a Colonel and Command Pilot and having held a wide variety of leadership roles, including command and senior staff positions. Mr. Martinez also holds Master of Science degrees from the University of Arkansas and the National Defense University.

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JOEL QUADRACCI

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Independent Chairman, President & CEO, Quad/Graphics Inc.

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Age: 52 Tenure: 1 year Other Public Boards: 1 Committee Assignment: Compensation & Leadership Development Government & Sustainability

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Skills and Experience:

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Public Company CEO/COO

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Manufacturing Management

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Financial and Accounting

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Global Business

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Quadracci has served as the Chairman, President and Chief Executive Officer of Quad/Graphics, Inc., a worldwide marketing solutions partner, since 2010. Mr. Quadracci joined Quad in 1991 and, prior to assuming his current role, served in various other positions with increasing responsibility including Senior Vice President of Sales & Administration and President and Chief Operating Officer. Mr. Quadracci received a B.A. in Philosophy from Skidmore College in 1991.

KAREN M. Rapp, 52 Director since 2018 RAPP

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Ms. Rapp has served as Independent Executive Vice President, Chief Financial Officer andVP, CFO & Treasurer, of National Instruments Corp., a producer of automated test equipment

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Age: 54 Tenure: 3 years Other Public Boards: 1 Committee Assignment: Audit Compensation & Leadership Development

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Skills and virtual instrumentation software, since 2017. Prior thereto, she served as the Senior Vice President of Corporate Development at NXP Semiconductors N.V., a provider of high performance mixed signalExperience:

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Financial and standard semi-conductor product solutions, where she led the integration efforts for the NXP/Freescale Semiconductor, Ltd. merger, from 2015 to 2017. Prior to the merger, Ms. Rapp held several leadership positions at Freescale with increasing responsibility, including Vice President and Chief Information Officer, Director of Operations and Finance, Global Sales and Marketing, Director of Finance, Accounting

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Supply Chain and Director of Finance, Continuous Development. Ms. Rapp holds a Master of Business Administration degree from The University of Texas at Austin and a Bachelor of Science degree in Finance from Northern Illinois University. Management

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Global Business

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Human Capital Development and Compensation

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Paul A. Rooke, 61 Director since 2017 ​

Mr. Rooke retired as Chairman​

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Sales, Marketing or Innovation

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Technology and Chief Executive Officer, as wellCybersecurity experience

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Environmental, Social & Governance

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Ms. Rapp has served as Executive Vice President and Chief Financial Officer, of National Instruments Corp., a producer of automated test equipment and virtual instrumentation software, since 2017. Ms. Rapp also previously served as National Instruments' Treasurer. Prior thereto, she served as the Senior Vice President of Corporate Development at NXP Semiconductors N.V., a global semiconductor company and a long-standing supplier in the industry, where she led the integration efforts for the NXP/Freescale Semiconductor, Ltd. merger, from 2015 to 2017. Prior to the merger, Ms. Rapp held several leadership positions at Freescale with increasing responsibility, including Vice President and Chief Information Officer, Director of Operations and Finance, Global Sales and Marketing, Director of Finance, Supply Chain, and Director of Finance, Continuous Development. Ms. Rapp is also a director of Microchip Technology Incorporated, a leading provider of smart, connected and secure embedded control solutions, as well as a member of its Audit Committee. Ms. Rapp holds an M.B.A from The University of Texas at Austin and a B.S. in Finance from Northern Illinois University.

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PAUL A. ROOKE

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Independent Chairman & CEO Lexmark International, Inc., a provider of document imaging and enterprise software solutions, in 2016. Mr. Rooke also previously served as President of Lexmark. Prior to becoming President and CEO of Lexmark in 2010, he held several leadership positions with increasing responsibility, including Executive Vice President and President, Imaging Solutions, Executive Vice President and President, Printing Solutions and Services, and Vice President and President, Business Printer. Mr. Rooke holds a Master of Business Administration degree from the University of Kentucky and a Bachelor of Science degree in Mechanical Engineering from the University of Michigan. (retired)

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Age: 63 Tenure: 4 years Other Public Boards: 0 Committee Assignment: Governance & Sustainability (Chair)

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Skills and Experience:

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Michael V. Schrock, 66 Director since 2006 Lead Director since 2013 ​

Mr. Schrock, who has served as the Lead Director of Plexus’ board since 2013, has served​

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Public Company CEO/COO

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Manufacturing Management

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Financial and Accounting

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Global Business

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Human Capital Development and Compensation

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Technology and Cybersecurity experience

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Sales, Marketing or Innovation

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Environmental, Social & Governance

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Mr. Rooke retired as Chairman and Chief Executive Officer, as well as a director, of Lexmark International, Inc., a provider of document imaging and enterprise software solutions, in 2016. Mr. Rooke also previously served as President of Lexmark. Prior to becoming President and CEO of Lexmark in 2010, he held several leadership positions with increasing responsibility, including Executive Vice President and President, Imaging Solutions, Executive Vice President and President, Printing Solutions and Services, and Vice President and President, Business Printer. Mr. Rooke holds an M.B.A. from the University of Kentucky and a B.S. in Mechanical Engineering from the University of Michigan.

MICHAEL V. SCHROCK

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Independent Lead Director Senior Advisor and& Operating Consultant, to Oak Hill Capital Partners a private equity firm, since 2014. He served

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Age: 68 Tenure: 15 years (8 as PresidentLead Director) Other Public Boards: 1 Committee Assignment: Compensation & Leadership Development

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Skills and Chief Operating Officer of Pentair Ltd. (now Pentair plc), a diversified manufacturer, until his retirement in 2013,Experience:

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Public Company CEO/COO

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Technology and Filtration Divisions. Prior to joining Pentair, Mr. Schrock held various senior management positions with Honeywell International Inc., a diversified technology and manufacturing company, covering North America as well as Europe, Africa and the Middle East. Mr. Schrock also serves as Chairman of the Board of Directors of Atkore International Group Inc., a manufacturer of electrical raceway products and mechanical products and solutions; he is also the chair of Atkore’s Executive Committee. In addition, Mr. Schrock is a director of MTS Systems Corporation, a global supplier of high-performance test systems and position sensors, as well as the chair of its Compensation and Leadership Development Committee and a member of itsCybersecurity experience

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Environmental, Social & Governance and Nominating Committee. Mr. Schrock earned a B.S. from Bradley University and an M.B.A. from Northwestern University, Kellogg School of Management.

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Mr. Schrock, who has served as the Lead Director of Plexus’ board since 2013, has served as a Senior Advisor and Operating Consultant to Oak Hill Capital Partners, a private equity firm, since 2014. Prior thereto, he served as President and Chief Operating Officer at Pentair LLC, a global water, fluid, thermal management, and equipment protection company. Mr. Schrock also serves as Chairman of the Board of Directors of Atkore International Group Inc., a manufacturer of electrical raceway products and mechanical products and solutions; he is also the chair of Atkore’s Executive Committee. Mr. Schrock earned a B.S. from Bradley University and an M.B.A. from Northwestern University, Kellogg School of Management. Mr. Schrock served as a director of MTS Systems Corporation, a global supplier of high-performance test systems and position sensors, from 2014 to 2021.

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CORPORATE GOVERNANCE

Plexus Corp. Board of Directors

Plexus believes that it needs to attract and retain talented, focused and motivated leadership to develop and execute the Company’s long-term strategy and to deliver shareholder value. For Plexus, the concept of leadership is not limited to leadership within the Company; leadership also includes the individuals who serve on Plexus’ board of directors. The Company believes it is important for its board to be comprised of individuals with diverse backgrounds, skills and experiences. All board members are expected to meet Plexus’ board member selection criteria, which are listed below:

Impeccable honesty and integrity, and conduct in accordance with the Company’s values.

A high level of knowledge gained through formal education and/or specific practical experience.

Broad based business acumen, including a general understanding of operations management, marketing, finance, human resources management, corporate governance and other elements relevant to the success of a large publicly-traded company.

An understanding of the Company’s business on a technical level.

Global thinking and focus as well as a general understanding of the world economy.

Strategic thinking and an ability to envision future opportunities and risks.

A willingness to engage in thoughtful debate and challenging discussions in a respectful manner.

A network of important contacts that can bring knowledge and assistance to Plexus.

A commitment to spend requisite time on board responsibilities.

In addition to the boardgeneral criteria for each Board member, selection criteria identified above, the board and the Nominating and Corporate Governance Committee review the board’s composition annually to ensure that an appropriate diversity of backgrounds,the Board should endeavor to include those board qualifications, attributes, skills and experiences is represented. Important skills and experiences currently identified are as follows:

Significant experience as a chief executive officer and/or chief operating officer of a publicly-traded company, or of a major division of a publicly-traded company.

Financial and accounting skills as well as experience in a public company, preferably with experience as a controller and/or chief financial officer; any such person is expected to fulfill the SEC’s requirements for an “audit committee financial expert.”

International experience with an understanding of conducting business on a global scale.

In-depth knowledge and significant practical experience in sales, marketing or innovation at a company positioned in one or more of our key markets.

A manufacturing management background, ideally an engineer, from a large, well respected manufacturing-based company, preferably one that relies on supply chain management for a competitive advantage.

Considerable experience in human capital development to fulfill talent and succession needs and to inform the design of both short- and long-term compensation and rewards programs.

The following is the Company’s matrix of experience for our directors, which together with the directors’ principal occupations and business experience described above, as well as the Company’s board member selection criteria, provide the reasons that each individual has been nominated to serve on the board. Boxes marked with an “X”set forth in the matrix below indicateabove. In the selection of board members, the Governance Committee also considers the demographic diversity among members in identifying areas that could be augmented by new members.

Shareholder Protections & Corporate Governance Best Practices

We are committed to governance structures and practices that drive shareholder value and protect important shareholder rights, which are regularly reviewed and include the particular experience is one of the specific reasons that the individual has been nominated to serve on the board. The lack of an “X” does not mean that the director does not possess that experience, but rather that it is not a particular area of focus or expertise that was specifically identified as a reason for that individual’s nomination.

Public Company CEO/COO Experience

X

X

X

X

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Financial and Accounting Experience

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X

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Global Business Experience

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X

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Sales, Marketing or Innovation Experience

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Manufacturing Management Background

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Supply Chain Management Experience

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X

X

X

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Human Capital Development and Compensation Experience

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X

X

X

X

X

X

X

X

X

X

Demographic Information

Age

71

69

71

60

61

60

62

54

52

61

66

Gender (Male/Female)

Male

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X

X

X

X

X

X

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X

Female

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X

In addition, any individual age 72 or above is not eligible for election orre-election to the board of directors, unless such candidate is also a full-time employee of Plexus at the time or the board of directors, by majority vote, waives the restriction for a particular individual prior to such person’s election orre-election.

following:

​	INDEPENDENCE	​	​	BEST PRACTICES	​	​	ACCOUNTABILITY	​
​	✔8 of 10 director nominees are independent ✔Strong independent Lead Director with clearly delineated duties ✔All standing board committees composed entirely of independent directors ✔Regular executive sessions of independent directors without management present ✔Periodic rotation of committee members	​	​	✔Strategy & risk oversight by the full board and its committees ✔Full board and committee oversight of ESG issues ✔Stock ownership guidelines for executive officers and non-employee directors ✔Overboarding limits ✔No poison pill ✔No dual class shares ✔Director education and onboarding	​	​	✔Annual election of all directors ✔Annual election of Chair and Independent Lead Director by independent directors ✔Majority voting with director resignation policy (plurality voting in contested elections) ✔Annual self-evaluation process for directors ✔Strong investor outreach program	​

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