Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Kelsey Todd P.
2. Date of Event Requiring Statement (Month/Day/Year)
08/29/2007
3. Issuer Name and Ticker or Trading Symbol
PLEXUS CORP [PLXS]
(Last)
(First)
(Middle)
55 JEWELERS PARK DRIVE
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr VP Global Customer Services
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEENAH, WI 54956
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock, $.01 par value 100
D
 
Common Stock, $.01 par value 270
D (1)
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to buy (2) 04/21/2000(2) 04/21/2009 Common Stock 5,000 $ 15.125 D  
Option to buy (2) 04/24/2001(2) 04/24/2010 Common Stock 4,800 $ 35.5469 D  
Option to buy (2) 04/06/2002(2) 04/06/2011 Common Stock 2,400 $ 23.55 D  
Option to buy (2) 04/22/2003(2) 04/22/2012 Common Stock 3,600 $ 25.285 D  
Option to buy (2) 01/30/2004(2) 01/30/2013 Common Stock 3,600 $ 8.975 D  
Option to buy (2) 08/14/2004(2) 08/14/2013 Common Stock 4,000 $ 14.015 D  
Option to buy (2) 04/28/2005(2) 04/28/2014 Common Stock 5,000 $ 15.825 D  
Option to buy (2) 05/18/2005(2) 05/18/2015 Common Stock 3,000 $ 12.94 D  
Option to buy (3) 05/17/2007(3) 05/17/2016 Common Stock 5,000 $ 42.515 D  
Option to buy (4) 05/17/2008(4) 05/17/2017 Common Stock 2,500 $ 21.41 D  
Option to buy (4) 08/01/2008(4) 08/01/2017 Common Stock 2,500 $ 23.83 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Kelsey Todd P.
55 JEWELERS PARK DRIVE
NEENAH, WI 54956
      Sr VP Global Customer Services  

Signatures

Todd P. Kelsey, by Megan Matthews, Attorney-in-Fact 09/06/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Options granted under the Plexus Corp. 2005 Equity Incentive Plan, or a predecessor plan, which qualifies under Rule 16b-3; now fully vested.
(3) Options granted under the Plexus Corp. 2005 Equity Incentive Plan which qualifies under Rule 16b-3. Options vest one third each year, commencing on the first anniversary of grant.
(4) Options granted under the Plexus Corp. 2005 Equity Incentive Plan which qualifies under Rule 16b-3. Options vest one half each year, commencing on the first anniversary of grant.

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