Mary A. Winston Joins Board of Directors

NEENAH, Wis., July 28 /PRNewswire-FirstCall/ — Plexus Corp. (NASDAQ:PLXS) today announced that its Board of Directors has increased the size of the Board to nine directors and has elected Mary A. Winston to fill the new seat, effective immediately. Ms. Winston currently serves as President and Founder of WinsCo Financial, LLC, a consulting firm focused on developing and implementing financial and strategic solutions for small to medium-sized companies. Prior to WinsCo Financial, LLC, Ms. Winston was the Executive Vice President and Chief Financial Officer for Scholastic Corporation. Ms. Winston held other accounting and financial positions with Visteon Corporation, Pfizer, Inc., Baxter International, Inc., SBC Ameritech, Inc., and Arthur Andersen & Co. She also serves on the Board of Directors and is Chairperson of the Audit Committee of Dover Corporation.

John Nussbaum, Chairman of the Board of Plexus Corp. commented, “I would like to welcome Ms. Winston to the Plexus Board of Directors. We believe her extensive financial and strategic planning experience will provide additional depth and insight as the Company continues to expand globally.”

Dean Foate, President and CEO of Plexus Corp. added, “The Plexus Leadership Team is looking forward to working with Ms. Winston to help us refine the strategy and values of the Company that we believe will drive long-term shareholder value.”

Ms. Winston holds a Masters of Business Administration in Finance, International Business and Marketing from the Kellogg School of Management at Northwestern University and a Bachelors of Business Administration in Accounting and Management Information Systems from the University of Wisconsin – Milwaukee. Ms. Winston is a Certified Public Accountant.

About Plexus Corp. — The Product Realization Company

Plexus (http://www.plexus.com/) is an award-winning participant in the Electronics Manufacturing Services (EMS) industry, providing product design, supply chain and materials management, manufacturing, test, fulfillment and aftermarket solutions to branded product companies in the Wireline/Networking, Wireless Infrastructure, Medical, Industrial/Commercial and Defense/Security/Aerospace market sectors.

The Company’s unique Focused Factory manufacturing model and global supply chain solutions are strategically enhanced by value-added product design and engineering services. Plexus specializes in mid- to low-volume, higher-mix customer programs that require flexibility, scalability, technology and quality.

Plexus provides award-winning customer service to more than 100 branded product companies in North America, Europe and Asia.

Safe Harbor and Fair Disclosure Statement

The statements contained in this release which are guidance or which are not historical facts (such as statements in the future tense and statements including “believe,” “expect,” “intend,” “plan,” “anticipate,” “goal,” “target” and similar terms and concepts), including all discussions of periods which are not yet completed, are forward-looking statements that involve risks and uncertainties, including, but not limited to: the economic performance of the electronics, technology and defense industries; the risk of customer delays, changes or cancellations in both ongoing and new programs; the poor visibility of future orders in the defense market sector and the uncertainty of defense appropriations and spending; the effects of the volume of revenue from certain sectors or programs on our margins in particular periods; our ability to secure new customers and maintain our current customer base; the risks of concentration of work for certain customers; material cost fluctuations and the adequate availability of components and related parts for production; the effect of changes in average selling prices; the effect of start-up costs of new programs and facilities, including our recent and planned expansions; the adequacy of restructuring and similar charges as compared to actual expenses; the degree of success and the costs of efforts to improve the financial performance of our Mexican operations and the outcome of our review of our other North American footprint; possible unexpected costs and operating disruption in transitioning programs; the costs and inherent uncertainties of pending litigation; market reaction to the recently completed share repurchase program; the effect of general economic conditions and world events (such as increases in oil prices, terrorism and war in the Middle East); the impact of increased competition; and other risks detailed in the Company’s Securities and Exchange Commission filings (particularly in Part II, Item 1A of our quarterly report on Form 10-Q for the quarter ended March 29, 2008).

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Source: Plexus Corp.