Document:

<PAGE>
                                                                   EXHIBIT 10.27

                SEVENTH AMENDMENT TO LOAN AND SECURITY AGREEMENT

         THIS SEVENTH AMENDMENT TO LOAN AND SECURITY AGREEMENT (this
"Amendment") is entered into as of the 16th day of October, 2002 by and among
the banks that are or may from time to time become parties hereto (individually
a "Bank" and collectively, the "Banks"), LASALLE BANK NATIONAL ASSOCIATION, a
national banking association (in its individual capacity, "LaSalle"), as agent
("Agent") for the Banks, and SIGMATRON INTERNATIONAL, INC., a Delaware
corporation (the "Borrower").

                                   WITNESSETH:

         WHEREAS, LaSalle and Borrower originally entered into that certain Loan
and Security Agreement dated as of August 25, 1999 (the "Original Agreement");

         WHEREAS, LaSalle previously assigned $10,000,000 (as subsequently
reduced to $8,000,000) of the Revolving Credit Commitment (as defined in the
Original Agreement) to National City Bank of Michigan/Illinois ("National
City"), pursuant to that certain Assignment Agreement dated as of June 30, 2000
between LaSalle and National City;

         WHEREAS, Agent, the Banks and Borrower entered into that certain
Amendment to Loan and Security Agreement dated as of August 31, 2000, that
certain Forbearance Agreement and Second Amendment to Loan and Security
Agreement dated as of February 1, 2001, that certain Forbearance Agreement and
Third Amendment to Loan and Security Agreement dated as of May 31, 2001, that
certain Forbearance Agreement and Fourth Amendment to Loan and Security
Agreement dated as of July 31, 2001, that certain Fifth Amendment to Loan and
Security Agreement dated as of November 30, 2001 and that certain Sixth
Amendment to Loan and Security Agreement dated as of April 22, 2002 (the
Original Agreement and all of the foregoing amendments are collectively referred
to as the "Agreement"); and

         WHEREAS, the Borrower and the Banks have agreed to further amend the
Agreement to, among other items, (i) add a LIBOR interest rate option, (ii)
modify certain financial covenants, (iii) extend the maturity date of the
Revolving Credit Commitment (as defined in the Agreement) and (iv) account for
the assignment by National City of its portion of the Loans to Charter One Bank,
N.A., a national banking association ("Charter One"), all in accordance with the
terms and conditions of this Amendment.

         NOW, THEREFORE, for and in consideration of the premises and mutual
agreements herein contained and for the purposes of setting forth the terms and
conditions of this Amendment, the parties, intending to be bound, hereby agree
as follows:

         1. Incorporation of the Agreement. All capitalized terms which are not
defined hereunder shall have the same meanings as set forth in the Agreement,
and the Agreement, to the extent not inconsistent with this Amendment, is
incorporated herein by this reference as though the same were set forth in its
entirety. To the extent any terms and provisions of the Agreement are
inconsistent with the amendments set forth in Paragraph 2 below, such terms and
provisions shall be deemed superseded hereby. Except as specifically set forth
herein, the Agreement shall remain in full force and effect and its provisions
shall be binding on the parties hereto.

<PAGE>

         2. Amendment of the Agreement.

                  (a) All provisions contained within the Original Agreement
concerning the Borrower's ability to borrow LIBOR Loans are hereby replaced in
their entirety as of the date hereof. Except as otherwise set forth in this
Amendment, all such LIBOR provisions shall remain as set forth in the Original
Agreement.

                  (b) The definition of the terms "Base Rate Margin", "LIBOR
Margin", "Maturity Date", "Revolving Loan", "Revolving Loan Borrowing Base" and
"Revolving Note" appearing in Paragraph 1.1 of the Agreement are hereby amended
and restated to read as follows:

                  "Base Rate Margin" shall mean 1.50%.

                  "LIBOR Margin" means four percent (4%).

                  "Maturity Date" means September 30, 2004 with respect to all
Loans.

                  "Revolving Loan" means and includes all Base Rate Loans and
         LIBOR Loans under the Revolving Credit Commitment, unless the context
         in which such term is used shall otherwise require.

                  "Revolving Loan Borrowing Base" means, as at any date of
         determination thereof, an amount equal to the lesser of (i) the amount
         then available under the Revolving Credit Commitment and (ii) an amount
         equal to the sum of (A) eighty-five percent (85%) of the net amount of
         Eligible Accounts Receivable outstanding at such date and (B) fifty
         percent (50%) (the "Inventory Advance Rate") of Eligible Inventory at
         such date; provided, however, that the aggregate amount of advances for
         Eligible Inventory under the Revolving Credit Commitment shall not
         exceed $9,000,000 at any time.

                  "Revolving Note" means those certain Substitute Revolving
         Notes dated as of October __, 2002 payable by Borrower to each of
         LaSalle Bank National Association and Charter One Bank in the maximum
         principal amounts of $12,000,000 and $8,000,000, respectively, as each
         may be amended, modified, substituted or restated from time to time,
         together with all renewals and exchanges therefore.

                  (c) Paragraph 11.2(f)(ii) is hereby amended and restated to
         read as follows:

                  Maintain an Interest Coverage Ratio, at all times, of at least
         5.0:1.0.

                  (d) Paragraph 11.2(f)(iv) is hereby amended and restated to
         read as follows:

                           (iv) Maintain a Leverage Ratio, at all times, of not
         more than the following amounts for each of the periods set forth
         below:

                                       2
<PAGE>

<Table>
<Caption>
                         Period                                                    Required
                         ------                                                    --------
<S>                                                                                <C>
                         July 31, 2002 through October 31, 2002                    2.00:1.0
                         November 1, 2002 through January 31, 2003                 1.75:1.0
                         February 1, 2003 and at all times thereafter              1.50:1.0
</Table>

                  (e) Paragraph 11.2(f)(v) is hereby amended and restated to
         read as follows:

                        (v) Borrower will not permit the aggregate amount of
         Capital Expenditures to exceed $2,250,000 in any fiscal year.

                  (f) Paragraph 11.2(f)(vi) is hereby amended and restated to
         read as follows:

                        (vi) Maintain EBITDA of not less than the following
         amounts for each of the periods set forth below:

<Table>
<Caption>
                   Period                                         Required
                   ------                                         --------
<S>                <C>                                            <C>
                   May 1, 2002 through October 31, 2002           $3,250,000
                   May 1, 2002 through January 31, 2003           $5,450,000
                   May 1, 2002 through April 30, 2003 and
                   each trailing twelve month period ended        $6,675,000
                   thereafter, measured on a quarterly basis
</Table>

         3. Representations and Warranties. The representations and warranties
set forth in Paragraph 11.1 and all covenants set forth in Paragraphs 11.2 and
11.3 of the Agreement shall be deemed remade and affirmed as of the date hereof
by Borrower, except that (i) Schedule 11.1(e) to the Agreement is hereby amended
and restated with Schedule 11.1(e) hereto and (ii) any and all references to the
Agreement in such representations, warranties and covenants shall be deemed to
include this Amendment.

         4. Delivery of Documents/Information. Prior to entering into this
Amendment, Agent shall have received from Borrower the following fully executed
documents, in form and substance satisfactory to Agent and each Bank, and all of
the transactions contemplated by each such document shall have been consummated
or each condition contemplated by each such document shall have been satisfied:

                  (a) Assignment Agreement between National City and Charter
         One;

                  (b) Revolving Note of each Bank;

                  (c) Secretary's Certificate of Borrower with resolutions and
         incumbency;

                  (d) Officer's Certificate (Closing Bring-Down) of Borrower;
         and

                  (e) such other documents, certificates and opinions as Agent
         may request.

                                       3
<PAGE>

         5. Reference to the Effect on the Agreement.

                  (a) References. Upon the date of this Amendment and on and
after the date hereof, each reference in the Agreement to "this Agreement,"
"hereunder," "hereof," "herein" or words of like import shall mean and be a
reference to the Agreement, as amended hereby.

                  (b) Ratification. As specifically modified above, the
Agreement and all other documents, instruments and agreements executed and/or
delivered in connection therewith shall remain in full force and effect, and are
hereby ratified and confirmed.

         6. Representations and Warranties of the Borrower. Borrower hereby
represents and warrants to Agent and the Banks as of the date hereof as follows:

                  (a) The execution and delivery of this Amendment and the
performance by Borrower of its obligations hereunder are within the Borrower's
powers and authority, have been duly authorized by all necessary corporate
action and do not and will not contravene or conflict with the Articles of
Incorporation or By-laws of Borrower.

                  (b) The Agreement (as amended by this Amendment) and the Other
Agreements constitute legal, valid and binding obligations enforceable in
accordance with their terms by Agent and the Banks against Borrower, and
Borrower expressly reaffirms each of its obligations under the Agreement (as
amended by this Amendment) and each of the Other Agreements, including, without
limitation, the Borrower's Liabilities. Borrower further expressly acknowledges
and agrees that Agent has a valid, duly perfected, first priority and fully
enforceable security interest in and lien against each item of Collateral except
as otherwise set forth in the Agreement. Borrower agrees that it shall not
dispute the validity or enforceability of the Agreement (as it was stated before
and after this Amendment) or any of the Other Agreements or any of its
respective obligations thereunder, or the validity, priority, enforceability or
extent of Agent's security interest in or lien against any item of Collateral,
in any judicial, administrative or other proceeding;

                  (c) No consent, order, qualification, validation, license,
approval or authorization of, or filing, recording, registration or declaration
with, or other action in respect of, any governmental body, authority, bureau or
agency or other Person is required in connection with the execution, delivery or
performance of, or the legality, validity, binding effect or enforceability of,
this Amendment;

                  (d) The execution, delivery and performance of this Amendment
by Borrower does not and will not violate any law, governmental regulation,
judgment, order or decree applicable to Borrower and does not and will not
violate the provisions of, or constitute a default or any event of default
under, or result in the creation of any security interest or lien upon any
property of Borrower pursuant to, any indenture, mortgage, instrument, contract,
agreement or other undertaking to which Borrower is a party or is subject or by
which Borrower or any of its real or personal property may be bound;

         7. Consent and Limited Waiver. Agent and the Banks hereby consent to
the purchase by Standard Components de Mexico, a wholly-owned subsidiary of
Borrower, of Plant No. 3 located in Acuna, Mexico (the "Purchase") from
Industrials Irvin de Mexico, Public

                                       4
<PAGE>

Corporation of Variable Capital (the "Seller") pursuant to the terms of that
certain Term Purchase Option with Right of Lien dated as of May 15, 2002.
Further, Agent and the Banks waive any default or Event of Default under the
Loan Agreement arising under Paragraphs 11.3(b) and 11.3(g) as a result of the
Purchase effective as of July 31, 2002. The Borrower hereby acknowledges that
the waiver contained in this Amendment is granted by Agent and the Banks only
for the limited purpose set forth herein and each term and provision of the Loan
Agreement continues in full force and effect. The waiver in no manner creates a
course of dealing or otherwise impairs the future ability of Agent or the Banks
to declare an Event of Default under or otherwise enforce the terms of the Loan
Agreement.

         8. Releases; Indemnities.

                  (a) In further consideration of the Banks' execution of this
Amendment, Borrower, and on behalf of its successors, assigns, subsidiaries and
Affiliates, hereby forever release Agent and each Bank and their respective
successors, assigns, parents, subsidiaries, Affiliates, officers, employees
directors, agents and attorneys (collectively, the "Releasees") from any and all
debts, claims, demands, liabilities, responsibilities, disputes, causes,
damages, actions and causes of action (whether at law or in equity) and
obligations of every nature whatsoever, whether liquidated or unliquidated,
known or unknown, matured or unmatured, fixed or contingent (collectively,
"Claims"), that Borrower may have against the Releasees which arise from or
relate to any actions which the Releasees may have taken or omitted to take
prior to the date this Amendment was executed, including without limitation with
respect to Borrower's Liabilities, any Collateral, the Agreement, any Other
Agreement and any third parties liable in whole or in part for Borrower's
Liabilities. This provision shall survive and continue in full force and effect
whether or not Borrower shall satisfy all other provisions of this Amendment,
the Other Agreements or the Agreement, including payment in full of Borrower's
Liabilities.

                  (b) Borrower hereby agrees that its obligation to indemnify
and hold the Releasees harmless as set forth in Paragraph 8(a) of this Amendment
shall include an obligation to indemnify and hold the Releasees harmless with
respect to any and all liabilities, obligations, losses, penalties, actions,
judgments, suits, costs, expenses or disbursements of any kind or nature
whatsoever incurred by the Releasees, or any of them, whether direct, indirect
or consequential, as a result of or arising from or relating to any proceeding
by, or on behalf of, any Person, including, without limitation, officers,
directors, agents, trustees, creditors, partners or shareholders of Borrower,
whether threatened or initiated, asserting any claim for legal or equitable
remedy under any statute, regulation or common law principle arising from or in
connection with the negotiation, preparation, execution, delivery, performance,
administration and enforcement of this Amendment or any other document executed
in connection herewith. The foregoing indemnity shall survive the payment in
full of the Borrower's Liabilities and the termination of this Amendment, the
Agreement and the Other Agreements.

         9. Fees and Expenses. The Borrower agrees to pay on demand all costs,
fees and expenses of or incurred by the Agent in connection with the evaluation,
negotiation, preparation, execution and delivery of this Amendment and the other
instruments and documents executed and delivered in connection with the
transactions described herein (including the filing or recording thereof),
including, but not limited to, the reasonable fees and expenses of counsel for

                                       5
<PAGE>

the Agent, search fees and taxes payable in connection with this Amendment and
any future amendments to the Agreement. Borrower also agrees to pay to Agent,
for the benefit of the Banks, a closing fee equal to $100,000 for the financial
accommodations provided to Borrower under this Amendment to be allocated among
the Banks in accordance with their respective pro-rata portions of the Revolving
Credit Commitment, $50,000 of which shall be due and payable on the date of this
Amendment, $25,000 of which shall be due and payable on January 1, 2003 and
remaining $25,000 shall be due and payable on April 1, 2003.

         10. Counterparts. This Amendment may be executed in two or more
counterparts, each of which shall be deemed an original, and all of which
together shall constitute one and the same instrument.

                            [SIGNATURE PAGE FOLLOWS]

                                       6
<PAGE>

        (SEVENTH AMENDMENT TO LOAN AND SECURITY AGREEMENT SIGNATURE PAGE)

         IN WITNESS WHEREOF, the parties hereto have duly executed this Seventh
Amendment to Loan and Security Agreement as of the date first above written.

                                     LASALLE BANK NATIONAL ASSOCIATION,
                                     for itself and as Agent

                                     By:   /s/ Sara A. Huizinga
                                        ----------------------------------------
                                     Its: Commercial Banking Officer
                                         ---------------------------------------

                                     CHARTER ONE BANK, N.A., as a Bank

                                     By:   /s/ Dan Sultan
                                        ----------------------------------------
                                     Its:  Vice-President
                                         ---------------------------------------

                                     SIGMATRON INTERNATIONAL, INC.

                                     By:   /s/ Gary R. Fairhead
                                        ----------------------------------------
                                     Its:  President / Chief Executive Officer
                                         ---------------------------------------

                                       7
<PAGE>

                                SCHEDULE 11.1(e)

                            CERTAIN OTHER OBLIGATIONS

<Table>
<Caption>
INSTITUTE                                                    LEASE NO.
---------                                                    ---------
<S>                                                          <C>
LaSalle National Leasing Corp.                               97-185
LNLC Commercial
135 South LaSalle Street, Dept. 1294
Chicago, IL  60674-1294

Bank One Leasing Corp.                                       98-088
Corp. Processing Dept. 0993
Columbus, OH  43271-0993

Anchor Bank                                                  98-106
P.O. Box 270
Grayslake, IL  60030

Bank One Leasing Corp.                                       98-010*
Corp. Processing Dept. 0993
Columbus, OH  43271-0993

First Midwest Bank                                           99-048*
Loan Operations
P.O. Box 9003
Gurnee, IL  60031-9003

State Bank Of The Lakes                                      00-182*
440 West Lake Street
Antioch, IL  60002

State Bank Of The Lakes                                      00-190
440 West Lake Street
Antioch, IL  60002

GE Capital                                                   GE005
P.O. Box 31001 0802
Pasadena, CA  91110-0802

International Financial Service Corp.                        00-280*
NW-8178
P.O. Box 1450
Minneapolis, MN  55485-8178
</Table>

*Subleased to SMT

<PAGE>

<Table>
<Caption>
INSTITUTE                                                    LEASE NO.
---------                                                    ---------
<S>                                                          <C>
Citicorp Vendor Financial, Inc.                              Citicapital
P.O. Box 7247-0371
Philadelphia, PA  19170-0371

Agilent Financial Services                                   Agilent Financial
P.O. Box 36263
Charlotte, NC  28236-6263

GE Capital                                                   GE 006
P.O. Box 31001 0802
Pasadena, CA  91110-0802

GE Capital                                                   GE-E004
P.O. Box 31001 0802
Pasadena, CA  91110-0802
</Table>

*Subleased to SMT<PAGE>
EXHIBIT 4.5

                         AMERITRADE HOLDING CORPORATION,

                         ARROW STOCK HOLDING CORPORATION

                                       and

                              THE BANK OF NEW YORK
                                   as Trustee

                          SECOND SUPPLEMENTAL INDENTURE

                           Dated as of August 30, 2002

               Supplement to Indenture dated as of August 4, 1999

                                  $200,000,000

             5.75% Convertible Subordinated Notes due August 1, 2004
<PAGE>
      SECOND SUPPLEMENTAL INDENTURE, dated as of August 30, 2002 by and between
AMERITRADE HOLDING CORPORATION, a Delaware corporation ("Ameritrade"), ARROW
STOCK HOLDING CORPORATION, a Delaware corporation and a wholly-owned subsidiary
of Ameritrade ("Arrow"),and THE BANK OF NEW YORK, a New York banking
corporation, as Trustee under the Indenture (as hereinafter defined) (the
"Trustee").

                                    RECITALS

      WHEREAS, Ameritrade and the Trustee have as of August 4, 1999 entered into
an Indenture (the "Indenture", all capitalized terms used and not otherwise
defined herein shall have the meanings set forth in the Indenture) providing for
the issuance by Ameritrade from time to time of its Securities to be issued in
one or more Series as may from time to time be authorized by supplemental
indenture.

      WHEREAS, 5.75% Convertible Subordinated Notes due August 1, 2004 (the
"Notes") have been issued pursuant to a First Supplemental Indenture, dated as
of August 4, 1999, by and between Ameritrade and the Trustee (the "First
Supplemental Indenture");

      WHEREAS, Ameritrade, Arrow, Arrow Merger Corp., a Delaware corporation and
a wholly-owned subsidiary of Arrow ("Ameritrade Merger Sub"), Dart Merger Corp.,
a Delaware corporation and a wholly-owned subsidiary of Arrow ("Datek Merger
Sub"), and Datek Online Holdings Corp., a Delaware corporation ("Datek"), have
entered into a Second Amended and Restated Agreement and Plan of Merger, dated
as of July 26, 2002 (the "Merger Agreement");

      WHEREAS, pursuant to the Merger Agreement Ameritrade will merge with and
into Ameritrade Merger Sub, after which Ameritrade will be the surviving entity
and a wholly owned subsidiary of Arrow (the "Ameritrade Merger"), and Datek will
merge with and into Datek Merger Sub after which Datek will be the surviving
entity and a wholly owned subsidiary of Arrow;

      WHEREAS, Ameritrade stockholders will receive, as consideration under the
Ameritrade Merger, one share of Arrow common stock, $0.01 par value per share
("Arrow Common Stock"), in exchange for each share of Class A common stock of
Ameritrade, $0.01 par value per share ("Ameritrade Common Stock"), held by
Ameritrade stockholders prior to the Ameritrade Merger;

      WHEREAS, Arrow, Ameritrade and the Trustee deem it advisable to enter into
this Second Supplemental Indenture, pursuant to Section 5.1 of the Indenture and
Section 2.12 of the First Supplemental Indenture, for the purpose of Arrow
assuming all of the obligations of Ameritrade under the Indenture and the First
Supplemental Indenture and substituting the Arrow Common Stock for the
Ameritrade Common Stock issuable upon conversion of the Notes;

      WHEREAS, the execution and delivery of this Second Supplemental Indenture
has been authorized by a Board Resolution;
<PAGE>
      WHEREAS, concurrent with the execution hereof, Ameritrade has delivered an
Officers' Certificate and has caused its counsel to deliver to the Trustee an
Opinion of Counsel; and

      WHEREAS, all things necessary to make this Second Supplemental Indenture a
valid agreement of Arrow in accordance with its terms have been done, and the
execution and delivery thereof have been in all respects duly authorized by the
parties hereto.

      NOW, THEREFORE, THIS SECOND SUPPLEMENTAL INDENTURE WITNESSETH:

      It is mutually agreed, for the equal and proportionate benefit of all
Holders of the Notes, as follows:

ARTICLE 1 - EFFECT OF THE AMERITRADE MERGER

      1.1 Assumption of Ameritrade Obligations

      Arrow hereby assumes all of the obligations of Ameritrade under the Notes,
the Indenture and the First Supplemental Indenture as of the effective time of
the Ameritrade merger.

      1.2 Conversion Rights

      The Holder of each Note outstanding at the effective time of the
Ameritrade Merger shall have the right thereafter, during the period such Note
shall be convertible as specified in Section 2.2 of the First Supplemental
Indenture, to convert such Note only into the kind and amount of securities,
cash and other property receivable upon the Ameritrade Merger by a holder of the
number of shares of Ameritrade Common Stock into which such Note might have been
converted immediately prior to the Ameritrade Merger, assuming such holder of
Ameritrade Common Stock is not a Person with which Ameritrade consolidated or
into which Ameritrade merged or which merged into Ameritrade (a "Constituent
Person"), or an Affiliate of a Constituent Person.

ARTICLE 2 - MISCELLANEOUS

      2.1 Continuance in Force.

      The Indenture and First Supplemental Indenture shall remain in full force
and effect and are hereby ratified and confirmed, except as specifically amended
and supplemented by, or to the extent inconsistent with, this Second
Supplemental Indenture.

      2.2 Benefits of Second Supplemental Indenture.

      Nothing contained in this Second Supplemental Indenture shall or shall be
construed to confer upon any person other than a Holder of the Notes, Arrow,
Ameritrade and the Trustee any
<PAGE>
right or interest to avail itself or himself, as the case may be, of any benefit
under any provision of the Indenture, the First Supplemental Indenture or this
Second Supplemental Indenture, except for Holders of Senior Indebtedness as
provided in Article 7 of the First Supplemental Indenture.

      2.3 Effective Date.

      This Second Supplemental Indenture shall be effective as of the date first
above written and upon the execution and delivery hereof by each of the parties
hereto.

      2.4 Counterparts.

      This Second Supplemental Indenture may be executed in any number of
counterparts, each of which so executed shall be deemed to be an original, but
all such counterparts shall together constitute but one and the same instrument.

      2.5 Trustee

      The Trustee makes no representations as to the validity or sufficiency of
this Second Supplemental Indenture, and the recitals and statements herein are
deemed to be those of Ameritrade and Arrow and not of the Trustee.
<PAGE>
      IN WITNESS WHEREOF, the parties hereto have caused this Second
Supplemental Indenture to be duly executed by their respective officers hereunto
duly authorized, all as of the day and year first above written.

                               AMERITRADE HOLDING CORPORATION

                               By:  /s/ John R. MacDonald
                                    --------------------------------------------
                                        Name:    John R. MacDonald
                                        Title:   Executive Vice President, Chief
                                                 Financial Officer and Treasurer

                               ARROW STOCK HOLDING CORPORATION

                               By:  /s/ John R. MacDonald
                                    --------------------------------------------
                                        Name:    John R. MacDonald
                                        Title:   Treasurer

                               THE BANK OF NEW YORK

                               By:  /s/ Van K. Brown
                                    --------------------------------------------
                                        Name:    Van K. Brown
                                        Title:   Vice President

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