PLEXUS acquisition history

SeaMED Corporation of Bothell, Washington, which designs and manufactures advanced durable electronic medical instruments for established and emerging medical technology companies, combining engineering, manufacturing and regulatory expertise to develop and commercialize advanced medical instruments. SeaMED merged with a wholly-owned subsidiary of Plexus and became a wholly-owned subsidiary. Stock merger; Plexus issued approximately 2,265,822 shares of common stock (0.4-for-1 exchange ratio) plus assumed options for ~171,804 shares.

SeaMED designs and manufactures advanced durable electronic medical instruments for both established and emerging medical technology companies. With its combination of engineering, manufacturing and regulatory expertise, SeaMED provides integrated solutions to the challenges of developing and commercializing advanced medical instruments.Plexus Corp Form 8-K (period of report July 23 — 1999), Item 2

Certain printed circuit board assembly manufacturing assets located in the Chicago, Illinois area, purchased from Shure Incorporated, an unrelated party. The manufacturing assets consisted principally of inventories and equipment. Operations were in Wheeling, Illinois. Cash, at approximately fair market value (amount not separately disclosed).

In September 1999, the Company purchased certain printed circuit board assembly manufacturing assets, located in the Chicago, Illinois area, from Shure Incorporated, an unrelated party. The manufacturing assets, consisting principally of inventories and equipment, were purchased at approximately fair market value for cash.Plexus Corp FY1999 Form 10-K405 — Item 1 Business

Printed circuit board operations of Intermec Technologies Corporation located in Everett, Washington, acquired in December 1999 and combined with Plexus's existing Bothell, Washington operations.

December 1999 Printed circuit board operations -- 45 Everett, Washington of Intermec Technologies Corporation (Combined with our existing Bothell, Washington, operations).Plexus Corp FY2001 Form 10-K405 — Item 1 Business (acquisitions table)

Agility, Incorporated of Ayer, Massachusetts, which specializes in the manufacture of complex printed circuit board assemblies along with complete box and system build capabilities. For its fiscal year ended December 31, 1999, Agility had net sales of $21.3 million. Agility merged with a wholly-owned subsidiary of Plexus and became a wholly-owned subsidiary. Stock merger; Plexus issued an aggregate of 374,997 shares of common stock.

Agility, of Ayer, Massachusetts, specializes in the manufacture of complex printed circuit board assemblies along with complete box and system build capabilities. For its fiscal year ended December 31, 1999, Agility had net sales of $21.3 million.Plexus Corp Form 8-K (period of report April 28 — 2000), Item 2

The turnkey electronic contract manufacturing operations of Elamex, S.A. de C.V. in Juarez, Mexico. Elamex formed two corporations to which it transferred specified assets, operations and liabilities of its turnkey electronic contract manufacturing operations, and Plexus purchased the stock of those acquired companies. The purchase was financed from working capital and Plexus's pre-existing bank lending facility. US $53.7 million (cash), subject to net-book-value adjustment.

On May 23, 2000, Plexus Corp. completed its previously announced acquisition of the turnkey electronic contract manufacturing operations of Elamex, S.A. de C.V. ... Plexus then purchased the stock of the Acquired Companies for US $53.7 million, subject to adjustment upon the final determination of the net book value of the Acquired Companies. The purchase price was paid in cash.Plexus Corp Form 8-K (period of report May 23 — 2000), Item 2

Keltek (Holdings) Limited, a UK electronics manufacturing services provider, acquired through Plexus Corp. Limited, a wholly-owned Plexus subsidiary, becoming an indirect wholly-owned subsidiary. Operations were located in Kelso, Scotland and Maldon, England. US $29.4 million aggregate (US $18.7M cash to shareholders + ~US $3.6M assumed obligations + US $7.1M loan notes due Dec 31, 2005).

On July 14, 2000, Plexus Corp. completed its previously announced acquisition of Keltek (Holdings) Limited ... In the transaction, Plexus paid an aggregate of US $29.4 million. Of that amount, US $18.7 million was paid to Keltek shareholders in cash, Plexus assumed Keltek obligations of approximately US $3.6 million, and Plexus issued (through the subsidiary) loan notes with a principal balance of US $7.1 million.Plexus Corp Form 8-K (period of report July 14 — 2000), Item 2

e2E Corporation, a privately held printed circuit board design and engineering service provider for electronic OEMs. The acquisition added more than 100 engineers/designers across seven domestic design centers, including Hillsboro, Oregon; Nashua, New Hampshire; and San Diego. Stock merger; Plexus issued 462,625 shares of common stock; ~$1.0 million merger costs expensed.

On December 21, 2000, the Company acquired e2E Corporation through the issuance of 462,625 shares of its common stock. The transaction is being accounted for as a pooling of interests. Costs associated with this merger in the amount of $1.0 million have been expensed as required.Plexus Corp Q1 FY2001 Form 10-Q — Note 5 - Merger

Qtron, Inc., a privately held electronic manufacturing service provider located in San Diego, California. Plexus acquired all of the outstanding shares of Qtron, accounted for using the purchase method of accounting. Approximately $29.0 million in cash; repaid $3.6 million Qtron notes payable to shareholders; assumed liabilities of $28.6 million.

On May 23, 2001, the Company completed its acquisition of Qtron, Inc., a privately held electronic manufacturing service provider located in San Diego, California. The Company acquired all of the outstanding shares of Qtron for approximately $29.0 million in cash, repaid outstanding Qtron notes payable of $3.6 million to Qtron shareholders and assumed liabilities of $28.6 million.Plexus Corp Q3 FY2001 Form 10-Q — Note 5 - Merger and Acquisition

Specified assets of MCMS, Inc., an EMS provider that had filed for reorganization under Chapter 11; the purchase was approved by the bankruptcy court. The acquired assets included the stock of MCMS's Chinese and Malaysian subsidiaries (facilities in Penang, Malaysia; Xiamen, China; and Nampa, Idaho), establishing Plexus's initial manufacturing presence in Asia. Base purchase price of $45 million plus specified assumed liabilities (cash), subject to working-capital adjustments.

On January 8, 2002, Plexus Corp. completed its previously announced acquisition of specified assets of MCMS, Inc. pursuant to an Asset Purchase Agreement dated as of November 28, 2001 ... the base purchase price was $45 million, plus the specified assumed liabilities, subject to verifications and future adjustments ... The purchase price was paid in cash.Plexus Corp Form 8-K (period of report January 8 — 2002), Item 2