Document:

EX-10.1

Plexus Corp.

Sixth Amendment To Credit Agreement

This Sixth Amendment to Credit Agreement (herein, the “Amendment”) is entered into as of June
30, 2005, by and among Plexus Corp., a Wisconsin corporation (the “Borrower”), the Subsidiaries
listed on the signature pages hereof, as Guarantors, the several financial institutions listed on
the signature pages hereof, as Lenders, and Harris N.A., as successor by merger to Harris Trust and
Savings Bank, as Administrative Agent for the Lenders.

Preliminary Statements

A. The Borrower, the Guarantors, the Lenders and the Administrative Agent are parties to a
Credit Agreement dated as of October 22, 2003, as amended (the “Credit Agreement”). All
capitalized terms used herein without definition shall have the same meanings herein as such terms
have in the Credit Agreement.

B. As a result of the requirements under GAAP that the Borrower periodically test goodwill for
impairment, the Borrower has requested that the Lenders amend the definition of “Adjusted EBITDA”
set forth in Section 5.1 of the Credit Agreement to exclude certain charges against income
reflecting impairment of goodwill, and the Required Lenders have agreed to do so, all on the terms
and conditions hereinafter set forth.

Now, Therefore, for good and valuable consideration, the receipt and sufficiency of
which is hereby acknowledged, the parties hereto agree as follows:

Section 1. Amendment.

Subject to the satisfaction of the conditions precedent set forth in Section 2 below, the
Credit Agreement shall be and hereby is amended as follows:

1.1. Section 5.1 of the Credit Agreement is hereby amended by deleting the definition
of “Adjusted EBITDA” set forth therein and replacing it with a new definition, to read in
its entirety as follows:

“Adjusted EBITDA” means, with reference to any period, the sum
of (a) EBITDA for such period, (b) without duplication of amounts
included in clause (a), EBITDA of the Acquired Business subject of
any Permitted Acquisition consummated during such period for that
portion of such period prior to the consummation of such Permitted
Acquisition, (c) one-time non-cash restructuring charges incurred
during such period (but limited to such charges incurred during the
fourth fiscal quarter of 2004 or the first or second fiscal quarters
of 2005) as described in the Borrower’s presentation to the Lenders
dated October 19, 2004 in an amount not to exceed $13,000,000 in the
aggregate, (d) all non-cash restructuring and other non-recurring
non-cash charges for such period other than those included within
Adjusted EBITDA pursuant to another clause of this definition (not
to exceed $20,000,000 in aggregate from July 13, 2004 through the
Revolving Credit Termination Date), provided that, for the purposes
of this clause (d), one-time charges representing accruals for
Operating Lease payments shall be deemed by the parties hereto to be
non-cash charges notwithstanding any contrary treatment of such
charges under GAAP, and (e) non-cash charges of up to $35.2 million
(subject to adjustments due to currency fluctuations which affect
the Buyer’s goodwill accounts) which may be taken from time to time
as a result of impairment charges arising from SFAS No. 142
(Goodwill and Other Intangible Assets) in connection with the
Borrower’s goodwill.

Section 2. Conditions Precedent.

Upon the satisfaction of the following conditions precedent, this Amendment shall become
effective as of and with effect from and after the date first above written:

2.1. The Borrower, the other Guarantors and the Required Lenders shall have executed
and delivered this Amendment.

2.2. The Borrower shall have paid to the Administrative Agent for the ratable account
of the Lenders an amendment fee in the amount of 0.05% of the aggregate Revolving Credit
Commitments.

2.3. The Borrower shall have paid to the Administrative Agent such fees as are required
to be paid pursuant to the terms of a letter between the Administrative Agent and the
Borrower dated June 22, 2005.

Section 3. Representations.

In order to induce the Lenders to execute and deliver this Amendment, the Borrower hereby
represents to the Lenders that as of the date hereof the representations and warranties set forth
in Section 6 of the Credit Agreement as amended hereby are and shall be and remain true and correct
(except that the representations contained in Section 6.5 of the Credit Agreement shall be deemed
to refer to the most current financial statements of the Borrower delivered to the Lenders) and
that the Borrower is in compliance with the terms and conditions of the Credit Agreement as amended
hereby and no Default or Event of Default has occurred and is continuing under the Credit Agreement
as amended hereby or shall result after giving effect to this Amendment.

Section 4. Miscellaneous.

4.1. The Borrower and the other Guarantors (collectively, the “Credit Parties”) have
heretofore executed and delivered to the Lenders the Collateral Documents. The Credit Parties
hereby acknowledge and agree that the Liens created and provided for by the Collateral Documents
continue to secure, among other things, the Obligations arising under the Credit Agreement as
amended hereby; and the Collateral Documents and the rights and remedies of the Lenders thereunder,
the obligations of the Borrower, and the other Guarantors thereunder, and the Liens created and
provided for thereunder, remain in full force and effect and shall not be affected, impaired or
discharged hereby. Nothing herein contained shall in any manner affect or impair the priority of
the liens and security interests created and provided for by the Collateral Documents as to the
indebtedness which would be secured thereby prior to giving effect to this Amendment.

4.2. By executing this Amendment in the place provided for that purpose below, each Guarantor
hereby consents to the Amendment to the Credit Agreement as set forth herein and confirms that its
obligations thereunder remain in full force and effect. Each Guarantor further agrees that the
consent of such Guarantor to any further amendments to the Credit Agreement shall not be required
as a result of this consent having been obtained.

4.3. Except as specifically amended herein, the Credit Agreement shall continue in full force
and effect in accordance with its original terms. Reference to this specific Amendment need not be
made in the Credit Agreement, the Notes, or any other instrument or document executed in connection
therewith, or in any certificate, letter or communication issued or made pursuant to or with
respect to the Credit Agreement, any reference in any of such items to the Credit Agreement being
sufficient to refer to the Credit Agreement as amended hereby.

4.4. The Borrower agrees to pay on demand all reasonable third party costs and expenses
incurred by the Administrative Agent in connection with the negotiation, preparation, execution and
delivery of this Amendment, including the reasonable fees and expenses of counsel for the
Administrative Agent.

4.5. This Amendment may be executed in any number of counterparts, and by the different
parties on different counterpart signature pages, all of which taken together shall constitute one
and the same agreement. Any of the parties hereto may execute this Amendment by signing any such
counterpart and each of such counterparts shall for all purposes be deemed to be an original. This
Amendment shall be governed by the internal laws of the State of Illinois.

[Signature Pages to Follow]

1

This Sixth Amendment to Credit Agreement is entered into as of June 30, 2005.

Borrower

Plexus Corp.

By /s/ George W.F. Setton

	 	 	 	Name George W.F. Setton

Title Corporate Treasurer and Chief Treasury Officer

Guarantors

Plexus Services Corp.

	 	 	 
	By

	 	/s/ George W.F. Setton

George W.F. Setton

Treasurer

Plexus Intl. Sales & Logistics, LLC

	 	 	 
	By

	 	/s/ George W.F. Setton

George W.F. Setton

Treasurer

Plexus QS, LLC

	 	 	 
	By

	 	/s/ George W.F. Setton

George W.F. Setton

Treasurer
	 
	 	 

2

Plexus International Services, Inc.

By /s/ Angelo Ninivaggi

	 	 	 	Name Angelo Ninivaggi

Title President

PTL Information Technology Services Corp.

By /s/ Angelo Ninivaggi

	 	 	 	Name Angelo Ninivaggi

Title President

3

Lenders

Harris N.A., successor by merger to Harris Trust and Savings Bank, in its individual capacity as a
Lender and as Administrative Agent

By /s/ Thad D. Rasche

	 	 	 	Name Thad D. Rasche

Title Vice President

LaSalle Bank National Association

By /s/ Lou D. Banach

	 	 	 	Name Lou D. Banach

Title Senior Vice President & Senior Banker

National City Bank

By /s/ Tiffany Cozzolino

	 	 	 	Name Tiffany Cozzolino

Title Vice President

The Bank of Tokyo — Mitsubishi, Ltd., Chicago Branch

By /s/ Tsuguyuki Umene

	 	 	 	Name Tsuguyuki Umene

Title Deputy General Manager

4

Wells Fargo Bank, National Association

By /s/ Joan F. Kurate

	 	 	 	Name Joan F. Kurate

Title Vice President

Royal Bank of Canada

	 	 	 
	By

	 	/s/ Suzanne Kaicher

Name Suzanne Kaicher

Title Attorney-In-Fact

Bank of America, N.A.

By /s/ Sugeet Manchanda Madan

	 	 	 	Name Sugeet Manchanda Madan

Title Senior Vice President

KeyBank National Association

	 	 	 
	By

	 	/s/ Daniel DiMarco

Name Daniel DiMarco

Title Assistant Vice President

U.S. Bank National Association

	 	 	 
	By

	 	/s/ Caroline V. Krider

Name Caroline V. Krider

Title Vice President and Senior Lender
	 
	 	 

5EX-10.1

FOURTH AMENDMENT AND WAIVER TO CREDIT AGREEMENT

THIS FOURTH AMENDMENT AND WAIVER TO CREDIT AGREEMENT, dated as of June 29, 2005 (this
“Amendment”), to the Existing Credit Agreement (as defined below) is made by FERRO
CORPORATION, an Ohio corporation (the “Borrower”), and certain of the Lenders (such
capitalized term and other capitalized terms used in this preamble and the recitals below to have
the meanings set forth in, or are defined by reference in, Article I below).

W I T N E S S E T H:

WHEREAS, the Borrower, the Lenders, National City Bank, as Administrative Agent, and Credit
Suisse (formerly Credit Suisse First Boston), as Syndication Agent, are parties to the Credit
Agreement, dated as of August 31, 2001 (as amended or otherwise modified prior to the date hereof,
the “Existing Credit Agreement”, and as amended by this Amendment and as the same may be
further amended, supplemented, amended and restated or otherwise modified from time to time, the
“Credit Agreement”);

WHEREAS, the Borrower has requested that the Lenders amend and waive certain provisions of the
Existing Credit Agreement and the Lenders are willing, on the terms and subject to the conditions
hereinafter set forth, to amend and waive such provision of the Existing Credit Agreement as set
forth below;

NOW, THEREFORE, in consideration of the promises and of the mutual agreements contained
herein, the parties hereto hereby agree as follows:

ARTICLE I

DEFINITIONS

SECTION 1.1. Certain Definitions. The following terms when used in this Amendment
shall have the following meanings (such meanings to be equally applicable to the singular and
plural forms thereof):

“Amendment” is defined in the preamble.

“Borrower” is defined in the preamble.

“Credit Agreement” is defined in the first recital.

“Existing Credit Agreement” is defined in the first recital.

“Fourth Amendment Effective Date” is defined in Article III.

SECTION 1.2. Other Definitions. Terms for which meanings are provided in the Credit
Agreement are, unless otherwise defined herein or the context otherwise requires, used in this
Amendment with such meanings.

ARTICLE II

AMENDMENTS TO CREDIT AGREEMENT

Effective on (and subject to the occurrence of) the Fourth Amendment Effective Date, the
provisions of the Existing Credit Agreement referred to below are hereby amended in accordance with
this Article II. Except as expressly so amended, the Existing Credit Agreement shall
continue in full force and effect in accordance with its terms.

SECTION 2.1. Amendments to Section 1. Section 1 of the Existing Credit Agreement is
hereby amended as follows:

SECTION 2.1.1. Amendments to Section 1.1. Section 1.1 of the Existing Credit
Agreement is hereby amended by

(a) inserting the following definition in such Section in the appropriate alphabetical
sequence:

“Fourth Amendment” means the Fourth Amendment to Credit Agreement, dated as of
June 29, 2005, among the Borrower and the Lenders party thereto.

(b) Amending the definition of “Consolidated EBITDA” contained therein by adding a new
clause (A)(viii) thereto as follows:

“(viii) expenses incurred in connection with the accounting investigations and
audit expenses in an aggregate amount not to exceed $12,000,000”

SECTION 2.2. Amendments to Section 9. Section 9 of the Existing Credit Agreement is
hereby amended as follows:

SECTION 2.2.1. Amendment to Section 9.6. Section 9.6 of the Existing Credit Agreement
is hereby amended by deleting the grid appearing therein and substituting the following grid in
replacement therefor:

	 	 	 
	Period	 	Leverage Ratio
	01/01/05 to 12/31/05

	 	3.75:1
	 
	 	 
	01/01/06 to 03/31/06

	 	3.50:1
	 
	 	 
	04/01/06 and thereafter

	 	3.25:1

SECTION 2.2.2. Amendment to Section 9.7. Section 9.7 of the Existing Credit Agreement
is hereby amended by deleting the grid appearing therein and substituting the following grid in
replacement therefor:

	 	 	 
	 	 	Fixed Charge
	Date	 	Coverage Ratio
	09/30/03

	 	1.50:1
	 
	 	 
	12/31/03

	 	1.50:1
	 
	 	 
	03/31/04

	 	1.65:1
	 
	 	 
	06/30/04

	 	1.65:1
	 
	 	 
	09/30/04

	 	1.75:1
	 
	 	 
	12/31/04

	 	1.75:1
	 
	 	 
	03/31/05

	 	1.40:1
	 
	 	 
	and thereafter

	 	

ARTICLE III

LIMITED WAIVER TO CREDIT AGREEMENT

Effective on (and subject to the occurrence of) the Fourth Amendment Effective Date, the
Lenders hereby waive until March 31, 2006, compliance by the Borrower with clauses (b) and (c) of
Section 8.1 of the Credit Agreement requiring the Borrower to deliver quarterly financial
statements with respect to the fiscal quarters ending June 30, 2004, September 30, 2004, December
31, 2004, March 31, 2005, June 30, 2005, September 30, 2005 and December 31, 2005 and a compliance
certificate for each such fiscal quarter.

ARTICLE IV

CONDITIONS TO EFFECTIVENESS

This Amendment and the amendments contained herein shall become effective on the date (the
“Fourth Amendment Effective Date”) when each of the conditions set forth in this
Article III shall have been fulfilled to the satisfaction of the Administrative Agent.

SECTION 4.1. Counterparts. The Administrative Agent shall have received counterparts
hereof executed on behalf of the Borrower and the Required Lenders.

SECTION 4.2. Amendment Fee. The Administrative Agent shall have received for the
account of each Lender that has delivered its signature page in a manner and before the time
specified by the Administrative Agent, an amendment fee in an amount equal to 0.125% of the amount
of such Lender’s outstanding Commitment.

SECTION 4.3. Costs and Expenses, etc. The Administrative Agent shall have received
for the account of each Lender, all fees, costs and expenses due and payable pursuant to Section
12.1 of the Credit Agreement, if then invoiced.

SECTION 4.4. Satisfactory Legal Form. The Administrative Agent and its counsel shall
have received all information, and such counterpart originals or such certified or other copies of
such materials, as the Administrative Agent or its counsel may reasonably request, and all legal
matters incident to the effectiveness of this Amendment shall be satisfactory to the Administrative
Agent and its counsel. All documents executed or submitted pursuant hereto or in connection
herewith shall be reasonably satisfactory in form and substance to the Administrative Agent and its
counsel.

ARTICLE V

MISCELLANEOUS

SECTION 5.1. Cross-References. References in this Amendment to any Article or Section
are, unless otherwise specified, to such Article or Section of this Amendment.

SECTION 5.2. Credit Document Pursuant to Existing Credit Agreement. This Amendment is
a Credit Document executed pursuant to the Existing Credit Agreement and shall (unless otherwise
expressly indicated therein) be construed, administered and applied in accordance with all of the
terms and provisions of the Existing Credit Agreement, as amended hereby, including Section 12
thereof.

SECTION 5.3. Successors and Assigns. This Amendment shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and assigns.

SECTION 5.4. Counterparts. This Amendment may be executed by the parties hereto in
several counterparts, each of which when executed and delivered shall be an original and all of
which shall constitute together but one and the same agreement. Delivery of an executed
counterpart of a signature page to this Amendment by facsimile shall be effective as delivery of a
manually executed counterpart of this Amendment.

SECTION 5.5. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK.

SECTION 5.6. Full Force and Effect; Limited Amendment. Except as expressly amended
hereby, all of the representations, warranties, terms, covenants, conditions and other provisions
of the Existing Credit Agreement and the Credit Documents shall remain unchanged and shall continue
to be, and shall remain, in full force and effect in accordance with their respective terms. The
amendments set forth herein shall be limited precisely as provided for herein to the provisions
expressly amended herein and shall not be deemed to be an amendment to, waiver of, consent to or
modification of any other term or provision of the Existing Credit Agreement or any other Credit
Document or of any transaction or further or future action on the part of any Credit Party which
would require the consent of the Lenders under the Existing Credit Agreement or any of the Credit
Documents.

SECTION 5.7. Representations and Warranties. In order to induce the Lenders to
execute and deliver this Amendment, the Borrower hereby represents and warrants to the Lenders, on
the Fourth Amendment Effective Date, after giving effect to this Amendment, all statements set
forth in clause (b) of Section 6.2 of the Existing Credit Agreement are true and correct as of such
date, except to the extent that any such statement expressly relates to an earlier date (in which
case such statement was true and correct on and as of such earlier date).

1

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Amendment as of
the date first above written.

FERRO CORPORATION

By:  /s/ Thomas M. Gannon

	 	 	 	Title: Vice President & Chief Financial

Officer

2

CREDIT SUISSE,

as a Lender

By:/s/ Brian Caldwell

	 	 	 	Title: Director

By: /s/ Rianka Mohan

	 	 	 	Title: Associate

3

NATIONAL CITY BANK,

as a Lender

By: /s/ Robert S. Coleman

	 	 	 	Title: Senior Vice President

4

BANCA NAZIONALE DEL LAVORO S.P.A., NEW YORK
BRANCH,

as a Lender

By: /s/ Filippo Cattaneo

	 	 	 	Title: Relationship Manager

By: /s/ Francesco Di Mario

	 	 	 	Title: Senior Manager

5

THE BANK OF NEW YORK,

as a Lender

By: /s/ Kenneth R. McDonnell

	 	 	 	Title: Vice President

6

THE BANK OF TOKYO-MITSUBISHI, LTD. CHICAGO
BRANCH,

as a Lender

By: /s/ Tsuguyuki Yumene

	 	 	 	Title: Deputy General Manager

7

CITICORP USA, INC.,

as a Lender

By: /s/ Joronne Jeter

	 	 	 	Title: Vice President

8

FIFTH THIRD BANK,

as a Lender

By: /s/ Martin H. McGinty

	 	 	 	Title: Vice President

9

BAYERISCHE HYPO- UND VEREINSBANK AG, NEW YORK
BRANCH,

as a Lender

By: /s/ Kimberly Sousa

	 	 	 	Title: Director

By: /s/ Ken Hamilton

	 	 	 	Title: Director

10

KEYBANK NATIONAL ASSOCIATION,

as a Lender

By: /s/ Marianne T. Meil

	 	 	 	Title: Vice President

11

THE NORINCHUKIN BANK,

as a Lender

By: /s/ Masanori Shoji

	 	 	 	Title: Joint General Manager

12

SUNTRUST BANK,

as a Lender

By: /s/ William C. Humphries

	 	 	 	Title: Managing Director

13

FLEET PRECIOUS METALS INC.,

as a Lender

By: /s/ Paul Mongeau

	 	 	 	Title: Vice President

14

FIRSTMERIT BANK, N.A.,

as a Lender

By: /s/ Jonathan M. Isaacs

	 	 	 	Title: Vice President

15

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