Document:

EX-10.31

Exhibit 10.31

AMENDMENT NO. 6 TO

SECURITIES PURCHASE AGREEMENT

THIS AMENDMENT NO. 6 TO SECURITIES PURCHASE AGREEMENT (this “Amendment”), dated as of
August 24, 2007, is by and between Digital Angel Corporation, a Delaware corporation (the
“Company”), and Imperium Master Fund, Ltd. (“Imperium”), and is made with reference to that certain
Securities Purchase Agreement dated as of February 6, 2007, as amended (the “Purchase Agreement”),
between the Company and Imperium, pursuant to which the Company issued to Imperium a 10.25% Senior
Secured Debenture (the “Debenture”) and a Warrant to purchase common stock of the Company (the
“Warrant”).  Capitalized terms used herein and not otherwise defined shall have the
respective meanings set forth in the Purchase Agreement and the Debenture, as applicable.

WHEREAS, the Company and Imperium entered into that certain Amendment No. 5 to Securities
Purchase Agreement dated as of June 24, 2007 (“Amendment No. 5”) whereby pursuant to paragraph 2
thereof, the Company agreed to a Prepayment Date of August 27, 2007 on which to prepay the
Debenture; and

WHEREAS, the Company has requested that Imperium agree to extend the Prepayment Date to
September 27, 2007, and Imperium has agreed to the requested extension on the terms and conditions
set forth herein.

NOW THEREFORE, for consideration, the adequacy of which is hereby acknowledged by all parties,
the parties hereto hereby agree to the following:

1. Exercise of Debenture Prepayment Option. The parties hereto hereby agree that,
notwithstanding paragraph 2 of Amendment No. 5, the Prepayment Date shall be September 27, 2007.
On the Prepayment Date, the Company shall pay to Imperium the Prepayment Amount with respect to
Imperium’s Debenture. The failure by the Company to pay the Prepayment Amount in full on the
Prepayment Date shall constitute an Event of Default.

2. Representations and Warranties.

(a) Imperium hereby severally and not jointly represents and warrants to the Company as of the
date hereof as follows:

(i) Imperium has the requisite corporate power and authority to execute, deliver and
perform this Amendment; and

(ii) This Amendment constitutes Imperium’s valid and legally binding obligation,
enforceable in accordance with its terms, subject to (x) applicable bankruptcy, insolvency,
fraudulent transfer, reorganization, moratorium or other similar laws of general application
relating to or affecting the enforcement of creditors’ rights generally and (y) general
principles of equity.

(b) The Company hereby represents and warrants to Imperium as of the hereof as follows:

(i) the Company is duly organized, validly existing and in good standing under the laws
of the State of Delaware;

(ii) the Company has the requisite corporate power and authority to execute, deliver
and perform this Amendment, and all corporate action on the part of the Company and by its
officers, directors and shareholders necessary for the authorization, execution and delivery
of, and the performance by the Company of its obligations under this Amendment has been
taken, and no further consent or authorization of any other party is required;

(iii) this Amendment constitutes the Company’s valid and legally binding obligation,
enforceable in accordance with its terms, subject to (i) applicable bankruptcy, insolvency,
fraudulent transfer, reorganization, moratorium or other similar laws of general application
relating to or affecting the enforcement of creditors’ rights generally and (ii) general
principles of equity; and

(iv) the execution, delivery and performance of this Amendment, and the consummation of
the transactions contemplated hereby and thereby, will not result in any violation of any
provisions of any of the Company’s organizational documents or in a default under any
provision of any instrument or contract to which the Company is a party or by which any of
its assets are bound, or in violation of any provision of any Governmental Requirement
applicable to the Company.

3. Entire Agreement; Amendment, This Amendment contains the entire understanding of
the parties with respect to the matters covered hereby and, except as specifically set forth
herein, neither the Company nor any Investor makes any representation, warranty, covenant or
undertaking with respect to such matters. No provision of this Amendment may be waived or amended
other than by a written instrument signed by the party against whom enforcement of any such
amendment or waiver is sought.

4. Governing Law. This Amendment shall be governed by and construed and enforced in
accordance with the laws of the State of New York applicable to agreements executed and to be
performed entirely within such State.

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

6. Authorization. The parties hereby represent and warrant to each other that the
signatories hereto have full power and authority to sign this Amendment for and on behalf of the
entities for which they purport to be signing and that their signatures hereto shall be binding and
enforceable upon the purported parties hereto.

7. Effect on Purchase Agreement. All other terms and provisions of the Purchase
Agreement shall remain the same and in full force and effect.

8. Fees and Expenses. The Company and Imperium shall pay all costs and expenses that
it incurs in connection with the negotiation, execution, delivery and performance of this
Amendment.

[The remainder of this page was intentionally left blank.]

1

[Signature page to Amendment No. 6 to Securities Purchase Agreement.]

IN WITNESS WHEREOF, the parties hereto have executed this Amendment No. 6 to Securities Purchase
Agreement as of the date set forth in the first paragraph hereof.

	 	 	 	 	 	 	 	 	 
	 

	 	 
	 	 
	 	                  
	 	COMPANY:
	
 
	 	 	 	 	 	 	 	DIGITAL ANGEL CORPORATION                            

By: /s/ Patricia M. Petersen
	
 
	 	 	 	 	 	 	 	 
	
 
	 	 	 	 	 	 	 	Name: Patricia M. Petersen
	
 
	 	 	 	 	 	 	 	 
	
 
	 	 	 	 	 	 	 	Title: General Counsel
	
 
	 	 	 	 	 	 	 	 
	
 
	 	 	 	 	 	 	 	INVESTOR:
	
 
	 	 	 	 	 	 	 	IMPERIUM MASTER FUND, LTD.

By: /s/ Maurice Hryshko
	
 
	 	 	 	 	 	 	 	 
	
 
	 	 	 	 	 	 	 	Name: Maurice Hryshko
	
 
	 	 	 	 	 	 	 	 
	 

	 	 
	 	 
	 	                  
	 	Title: Counsel
	
 
	 	 	 	 	 	 	 	 

2EX-10.1

Exhibit 10.1

CORE MOLDING TECHNOLOGIES, INC.

RESTRICTED STOCK AGREEMENT

AGREEMENT made as of      (the “Grant Date”), by and between Core Molding
Technologies, Inc. (the “Company”) and      , an executive of the Company (the
“Executive”).

W I T N E S S E T H

WHEREAS, pursuant to the provisions of the Company’s 2006 Long-Term Equity Incentive Plan (the
“Plan”), the Company desires to award to the Executive restricted shares of the Company’s Common
Stock (“Common Stock”), in accordance with the provisions of the Plan, all on the terms and
conditions hereinafter set forth; and

WHEREAS, Executive wishes to accept said offer; and

WHEREAS, the parties hereto understand and agree that any terms used and not defined herein
have the same meanings as in the Plan.

NOW THEREFORE, in consideration of the mutual covenants hereinafter set forth and for other
good and valuable consideration, the parties hereto agree as follows:

1. Terms of Award.  The Company awards to the Executive      shares of the
Company’s Common Stock (the “Shares”) in accordance with the terms of this Agreement.

2. Provisions of Plan Controlling.  The Executive specifically understands and agrees
that the Shares issued under the Plan are being awarded to the Executive pursuant to the Plan,
copies of which Plan the Executive acknowledges he has read, understands and by which he agrees to
be bound. The provisions of the Plan are incorporated herein by reference. In the event of a
conflict between the terms and conditions of the Plan and this Agreement, the provisions of the
Plan will control.

3. Vesting of Restricted Stock.

(a) Except as provided in paragraphs (b) and (c), the Shares awarded hereunder shall be
forfeited to the Company for no consideration in the event (i) Executive voluntarily terminates his
or her employment with the Company prior to the Third Anniversary of the Grant Date or (ii)
Executive is terminated by the Company (with or without cause) prior to the Third Anniversary of
Grant Date.

(b) Except as provided in Section 4 hereof, the Shares awarded hereunder shall be fully vested
in the Executive and no longer subject to a risk of forfeiture pursuant to paragraph (a) upon the
occurrence of the earliest of the following events:

(i) the date on which the Company undergoes a “Change in Control” as defined in the
Plan;

(ii) the date on which the Executive dies or becomes disabled; or

(iii) the date of the Executive’s 65th birthday.

(c) Except as provided in Section 4 hereof, the Shares awarded hereunder shall vest in the
Executive and shall no longer be subject to a risk of forfeiture pursuant to the following
schedule:

	 	 	 
	Number of Shares

	 	Date of Vesting
	1/3

	 	First Anniversary of Grant Date
	1/3

	 	Second Anniversary of Grant Date
	1/3

	 	Third Anniversary of Grant Date

(d) For purposes of this Agreement, the Executive shall be deemed disabled if, as a result of
his incapacity due to physical or mental illness, he shall have been absent from his duties with
the Company on a full-time basis for a period of at least six months and a physician selected by
him and acceptable to the Company is of the opinion that (i) he is suffering from “Total
Disability” as defined in the Company’s Disability Insurance Plan, or any successor plan or program
and (ii) he will qualify for Social Security Disability Payment and (iii) within thirty (30) days
after such determination is made, he shall not have returned to the full-time performance of his
duties.

4. Requirement of Stock Ownership for Vesting.

(a) Notwithstanding Sections 3(b)(iii) and 3(c) hereof, Executive’s right to the Shares shall
not vest unless Executive owns shares of Common Stock of the Company for a period of 60 consecutive
calendar days while employed by the Company that are equal in value to 60%/120% of Executive’s base
annual salary as of the Grant Date (the “Stock Ownership Requirement”). Solely for purposes of
determining whether Executive has satisfied the Stock Ownership Requirement, Executive will be
treated as owning the time-vested Shares set forth in Section 1 hereof (but only to the extent such
Shares have vested in accordance with Section 3 hereof), provided that the value of such Shares may
only be taken into account to the extent of, and may only be treated as satisfying, seven-twelfths
(7/12) of the Stock Ownership Requirement.

(b) In the event that (i) Executive’s right to any installment of Shares set forth under
Section 3(c) vests (the “Original Vesting”), (ii) Executive satisfies the Stock Ownership
Requirement set forth in Section 4(a), and (iii) Executive continues to satisfy the Stock Ownership
Requirement, Executive shall be deemed to satisfy the Stock Ownership Requirement for all future
vesting dates set forth in Section 3(c) notwithstanding any depreciation in the value of such
shares owned by the Executive. For purposes of this provision, the sale by an Executive of any
Shares solely to satisfy the Executive’s income and employment tax obligations associated with the
vesting of the Shares shall be permitted, provided that Executive may not dispose of Shares to the
extent such disposition causes the Executive to reduce his or her stock ownership levels below that
number of Shares that is equal in value to 50%/100% of Executive’s base salary as of the Grant Date

(c) In the event that, as of the Grant Date, Executive does not satisfy at least a 25%/50%
base salary portion of the Stock Ownership Requirement with shares of Common Stock purchased by the
executive, (i) Executive shall be required (and hereby agrees) to participate in the Company’s 2002
Employee Stock Purchase Plan (the “2002 Plan”) and shall be required to agree to payroll deductions
under the 2002 Plan equal to 2%/3.5% of Executive’s base salary until such time as Executive
satisfies the Stock Ownership Requirement and (ii) Executive shall be required, on or before the
December 31st following Executive’s receipt of a bonus (subsequent to the Grant Date)
under the Company’s short-term incentive bonus plan, to utilize fifteen percent (15%) of such bonus
(or such lower amount as is necessary to satisfy the Stock Ownership Requirement) to purchase
shares of Common Stock of the Company and to provide proof of such purchase to the Treasurer of the
Company.

(d) Solely for purposes of determining whether or to what degree the Executive has satisfied
the Stock Ownership Requirement, (i) any shares of Common Stock purchased by Executive (including
shares purchased through the exercise of a stock option) shall be valued at the greater of
Executive’s basis in such shares or the fair market value of such shares existing on May 17, 2006,
(ii) shares of stock held for the benefit of the Executive in the Company’s 401(k) plan shall be
valued at the greater of the purchase price of such shares or the fair market value of such shares
existing on May 17, 2006, and (iii) purchases of shares of Common Stock (including 401(k) matches
by the Company) that occur after May 17, 2006 will be valued at the basis in such shares, except
for stock purchased through the exercise of a stock option, which shall be valued at the fair
market value of such shares on the date of purchase, and (iv) time-vested restricted stock grants
will be valued for ownership purposes at the fair market value of the stock on the grant date of
the applicable award.

(e) In the event the Board of Directors of the Company, or the Committee determines in good
faith that Executive has engaged in a pattern of behavior designed to frustrate the intent of this
Section 4 (including, but not limited to, purchases of shares of Common Stock followed by
dispositions of such shares immediately after satisfaction of the Stock Ownership Requirement), the
Board (or Committee) shall be entitled to cancel this award of Shares in its entirety and Executive
shall be required to forfeit all Shares awarded hereunder (whether vested or unvested) back to the
Company for no consideration.

(f) For the avoidance of doubt, in the event of a Change in Control or death or disability,
Executive or the Executive’s estate shall not be required to satisfy the Stock Ownership
Requirement and all Shares awarded hereunder shall fully vest.

(g) In the event that the Executive is assigned to a new position in the Company, and a
different Stock Ownership Requirement is applicable to such new position, the new Stock Ownership
Requirement shall immediately become applicable to any unvested Shares and the Company shall
promptly inform the Executive of such new Stock Ownership Requirement.

(h) In the event an Executive elects to satisfy the tax withholding obligations associated
with the vesting of the Shares in cash, the Stock Ownership Requirement shall be reduced to 100%
provided that, in such event, the value of such time vested Shares may only be taken into account
to the extent of one-half (1/2) of the Stock Ownership Requirement Such election must be made by
giving written notice of the election to the Compensation Committee in care of the Treasurer of the
Company.

(i) Executive agrees to notify the Compensation Committee in care of the Treasurer of the
Company of any transaction involving Company Stock within 24 hours other than purchases as part of
the Company’s 2002 Employee Stock Purchase Plan (the “2002 Plan”) and stock purchases as part of
the Company’s 401(k) match .

5. Dividend and Voting Rights. Executive shall have the right to vote any Shares
awarded hereunder and to receive any dividends declared with respect to such Shares, provided that
such voting and dividend rights shall lapse with respect to any Shares that are forfeited to the
Company pursuant to this Agreement.

6. Additional Shares.  (a) If the Company shall pay a stock dividend or declare a
stock split on or with respect to any of its Common Stock, or otherwise distribute securities of
the Company to the holders of its Common Stock, the number of shares of stock or other securities
of the Company issued with respect to the Shares then subject to the restrictions contained in this
Agreement shall be added to the Shares subject to this Agreement. If the Company shall distribute
to its stockholders shares of stock of another corporation, the shares of stock of such other
corporation distributed with respect to the Shares then subject to the restrictions contained in
this Agreement shall be added to the Shares subject to this Agreement.

(b) If the outstanding shares of Common Stock of the Company shall be subdivided into a
greater number of shares or combined into a smaller number of shares, or in the event of a
reclassification of the outstanding shares of Common Stock of the Company, or if the Company shall
be a party to a merger, consolidation or capital reorganization, there shall be substituted for the
Shares then subject to the restrictions contained in this Agreement such amount and kind of
securities as are issued in such subdivision, combination, reclassification, merger, consolidation
or capital reorganization in respect of the Shares subject to this Agreement.

7. Legends.  All certificates representing the Shares to be issued to the Executive
pursuant to this Agreement shall have endorsed thereon legends substantially as follows:

“The shares represented by this certificate are subject to
restrictions set forth in a Restricted Stock Agreement with
this Company dated [date], a copy of which Agreement is
available for inspection at the offices of the Company or will
be made available upon request.”

“The shares represented by this certificate have been taken
for investment and they may not be sold or otherwise
transferred by any person, including a pledgee, unless (1)
either (a) a Registration Statement with respect to such
            shares shall be effective under the Securities Act of 1933, as
amended, or (b) the Company shall have received an opinion of
counsel satisfactory to it that an exemption from registration
under such Act is then available, and (2) there shall have
been compliance with all applicable state securities laws.”

8. No Obligation to Employ.  The Company is not obligated, by the Plan or this
Agreement, to continue the Executive as an employee of the Company.

9. Investment Intent.  The Executive represents and warrants to the Company that the
Shares are being acquired for the Executive’s own account, for investment, and not with a view to,
or for sale in connection with, the distribution of any such Shares.

10. Notices.  Any notices required or permitted by the terms of this Agreement or the
Plan shall be given by recognized courier service, facsimile, registered or certified mail, return
receipt requested, addressed as follows:

To the Company:

To the Executive:

or to such other address or addresses of which notice in the same manner has previously been given.
Any such notice shall be deemed to have been given upon the earlier of receipt, one business day
following delivery to a recognized courier service, or three business days following mailing by
registered or certified mail.

11. Governing Law.  This Agreement shall be construed and enforced in accordance with
the law of the State of Delaware (without giving effect to the conflict of laws principles thereof)
in all respects, including, without limitation, matters relating to the validity, construction,
interpretation, administration, effect, enforcement, and remedies provisions of this Agreement,
except to the extent preempted by applicable federal law.

12. Withholding. Prior to delivery of Shares to Executive upon the release of the
restrictions stated in Section 3 hereof, Executive shall be required to make arrangements,
satisfactory to the Company, for appropriate withholding for federal, state, and local tax
purposes. Executive is permitted to satisfy any such tax withholding requirements, in whole or in
part, by delivering shares of Common Stock to the Company (including the Shares awarded hereunder)
having a fair market value (as determined by Company in its sole discretion) equal to the amount of
such tax.

13. Benefit of Agreement.  Subject to the provisions of the Plan and the other
provisions hereof, this Agreement shall be for the benefit of and shall be binding upon the heirs,
executors, administrators, successors and assigns of the parties hereto.

14. Entire Agreement.  This Agreement, together with the Plan, embodies the entire
agreement and understanding between the parties hereto with respect to the subject matter hereof
and supersedes all prior oral or written agreements and understandings relating to the subject
matter hereof. No statement, representation, warranty, covenant or agreement not expressly set
forth in this Agreement shall affect or be used to interpret, change or restrict the express terms
and provisions of this Agreement, provided, however, in any event, this Agreement shall be subject
to and governed by the Plan.

15. Modifications and Amendments.  The terms and provisions of this Agreement may be
modified or amended as provided in the Plan.

16. Waivers and Consents.  The terms and provisions of this Agreement may be waived,
or consent for the departure therefrom granted, only by written document executed by the party
entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to
be or shall constitute a waiver or consent with respect to any other terms or provisions of this
Agreement, whether or not similar. Each such waiver or consent shall be effective only in the
specific instance and for the purpose for which it was given, and shall not constitute a continuing
waiver or consent.

IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by a duly authorized
officer, and the Executive has hereunto set his or her hand, all as of the day and year first above
written.

CORE MOLDING TECHNOLOGIES, INC.

By: ______________________________________

__________________________________________

Executive

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