Exhibit 21
Plexus Corp. 2010 Form 10-K

LIST OF SUBSIDIARIES

1. Plexus International Services, Inc. (“PISI”), a Nevada corporation and subsidiary of Plexus Corp.

a. Plexus Corp. Limited (“PCL”), a United Kingdom corporation and subsidiary of PISI

(i)	Plexus Corp. (UK) Limited (“PCLUK”), a United Kingdom corporation and subsidiary of PCL
(ii)	Plexus Services RO S.R.L. (“Romania”), A Romania corporation and subsidiary of PCL

b. Plexus Asia, Ltd. (“PAL”), a British Virgin Islands corporation, approximately 81% owned by PISI and 19% owned by PCLUK

(i)	Plexus (Xiamen) Co., Ltd., a Peoples’ Republic of China corporation and subsidiary of PAL
(ii)	Plexus (Hangzhou) Co., Ltd., a Peoples’ Republic of China corporation and subsidiary of PAL
(iii)	Plexus Manufacturing Sdn. Bhd., a Malaysia corporation and subsidiary of PAL

c. Plexus Deutschland GmbH, owned by PISI

2.	Plexus Intl. Sales & Logistics, LLC (“PISL”), a Delaware LLC
3.	Plexus QS, LLC, (“PQS”), a Delaware LLC
4.	Plexus Electronica S. de R.L. de C.V., a Mexico entity and subsidiary of PISL and PQS
5.	PTL Information Technology Services Corp., a Nevada corporation
6.	Plexus Management Services Corporation, a Nevada corporation

Omits inactive and dormant subsidiaries.