FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * Frisch Steven J.   2. Issuer Name and Ticker or Trading Symbol PLEXUS CORP [PLXS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr VP Global Eng Services (Last) (First) (Middle) 55 JEWELERS PARK DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 03/09/2009 (Street) NEENAH, WI 54956 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, $.01 par value 03/09/2009   P   500 A $ 10.58 2,000 D   Common Stock, $.01 par value               406 D (1)   Common Stock, $.01 par value               3,541 I 401(k) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Option to Buy

$ 35.5469

04/24/2001(3)

04/24/2010

Common Stock

4,800

4,800

D

Option to Buy

$ 23.55

04/06/2002(3)

04/06/2011

Common Stock

2,400

2,400

D

Option to Buy

$ 25.285

04/22/2003(3)

04/22/2012

Common Stock

2,400

2,400

D

Option to Buy

$ 15.825

04/28/2005(3)

04/28/2014

Common Stock

5,000

5,000

D

Option to Buy

$ 12.94

05/18/2005(3)

05/18/2015

Common Stock

3,000

3,000

D

Option to Buy

$ 42.515

05/17/2007(4)

05/17/2016

Common Stock

5,000

5,000

D

Option to Buy

$ 21.41

05/17/2008(5)

05/17/2017

Common Stock

1,500

1,500

D

Option to Buy

$ 23.83

08/01/2008(5)

08/01/2017

Common Stock

1,500

1,500

D

Option to Buy

$ 30.54

11/05/2008(5)

11/05/2017

Common Stock

2,000

2,000

D

Option to Buy

$ 22.17

01/28/2009(5)

01/28/2018

Common Stock

2,000

2,000

D

Option to Buy

$ 24.21

04/28/2009(6)

04/28/2018

Common Stock

2,000

2,000

D

Option to Buy

$ 29.71

07/29/2009(6)

07/29/2018

Common Stock

2,000

2,000

D

Option to Buy

$ 18.085

10/31/2009(6)

10/31/2018

Common Stock

3,000

3,000

D

Option to Buy

$ 14.625

02/02/2010(6)

02/02/2019

Common Stock

3,000

3,000

D

Restricted Stock Units

(7)

(8)

(8)

Common Stock

2,280

2,280

D

Restricted Stock Units

(9)

(10)

(10)

Common Stock

2,985

2,985

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Frisch Steven J. 55 JEWELERS PARK DRIVE NEENAH, WI 54956			Sr VP Global Eng Services

Signatures

Steven J. Frisch, by Angelo M. Ninivaggi, Attorney-in-Fact		03/10/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Shares of Plexus Corp. common stock held in the Plexus Corp. Employee Stock Purchase Plan as of the last date of a statement from the Plan's Trustee.
(2)	Shares of Plexus Corp. common stock held in the Plexus Corp. 401(k) Savings Plan as of the last date of a statement from the Plan's trustee.
(3)	Options granted under the Plexus Corp. 2005 Equity Incentive Plan, or a predecessor plan, which qualifies under Rule 16b-3; now fully vested.
(4)	Options granted under the Plexus Corp. 2005 Equity Incentive Plan, which qualifies under Rule 16b-3; one third vest each year, commencing on the first anniversary of grant.
(5)	Options granted under the Plexus Corp. 2005 Equity Incentive Plan, which qualifies under Rule 16b-3; one half vest each year, commencing on the first anniversary of grant.
(6)	Options granted under the Plexus Corp. 2008 Long-Term Incentive Plan, which qualifes under Rule 16b-3; one half vest each year, commencing on the first anniversary of grant.
(7)	Each Restricted Stock Unit granted under the Plexus Corp. 2005 Equity Incentive Plan, which qualifies under Rule 16b-3, represents a contingent right to receive one share of Plexus Corp. common stock.
(8)	The Restricted Stock Units vest on November 5, 2010.
(9)	Each Restricted Stock Unit granted under the Plexus Corp. 2008 Long-Term Incentive Plan, which qualifies under Rule 16b-3, represents a contingent right to receive one share of Plexus Corp. common stock.
(10)	The Restricted Stock Units vest on October 31, 2011.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.