Document:

Exhibit 10.4

                           RESTRICTED STOCK AGREEMENT
                      UNDER THE THIRD AMENDED AND RESTATED
               WESTWOOD HOLDINGS GROUP, INC. STOCK INCENTIVE PLAN

         WHEREAS, WESTWOOD HOLDINGS GROUP, INC., a Delaware corporation (the
"Company") previously established the Third Amended and Restated Westwood
Holdings Group, Inc. Stock Incentive Plan (the "Plan"); and

         WHEREAS, this RESTRICTED STOCK AGREEMENT (the "Agreement"), is made as
of the ___ day of ____________, 20__, between the Company and _________________
(the "Employee"), and sets forth the terms of the Restricted Shares (as defined
below) issued to Employee pursuant to the Plan's terms; and

         WHEREAS, all of the terms and provisions of the Plan are incorporated
herein by reference and made a part hereof, and all capitalized terms used but
not defined in this Agreement have the meanings set forth in the Plan.

         NOW THEREFORE, in consideration of the mutual covenants hereinafter set
forth, the parties hereto agree as follows:

1.       Grant of Restricted Stock. The Company hereby grants to Employee, on
         the terms and conditions hereinafter set forth, ______ shares of the
         presently authorized but unissued Common Stock, $.01 par value per
         share, of the Company (the "Restricted Stock").

2.       Issue Date and Vesting.

         A.       The Issue Date of the Restricted Stock shall be
                  ________________, 20__.

         B.       The Restricted Stock granted to Employee hereunder, subject to
                  the other terms and conditions set forth herein, shall become
                  vested in accordance with the following schedule:

                                                  CUMULATIVE PERCENTAGE
                          VESTING DATE               OF STOCK VESTED
                  --------------------------      ---------------------
                  Issue Date                               0%

                  --------------------------            ----%

                  --------------------------            ----%

                  --------------------------            ----%

                  --------------------------            ----%

                  In addition, upon the death of the Employee, all of the
                  Restricted Stock shall become 100% vested, effective upon the
                  date of death.

<PAGE>

         C.       Upon termination of employment of Employee (for any reason
                  other than death), any shares of Restricted Stock that have
                  not vested shall be forfeited to the Company without
                  consideration.

3.       Employment of Employee. As an inducement to the Company to issue the
         Restricted Stock to Employee, and as a condition thereto, Employee
         acknowledges and agrees that, without limitation of his or her rights
         under his or her employment agreement with the Company, if any, neither
         the issuance of the Restricted Stock to Employee nor any provision
         contained herein shall entitle Employee to remain in the employment of
         the Company or its affiliates or affect the right of the Company to
         terminate Employee's employment at any time.

4.       Restrictions on Transfer.

         A.       Under no circumstances shall any sale or other transfer of any
                  shares of Restricted Stock be valid unless and until the
                  shares proposed to be sold or transferred are vested.

         B.       The spouse of Employee shall execute a signature page to this
                  Agreement as of the date hereof and agree to be bound in all
                  respects by the terms hereof to the same extent as Employee.
                  The spouse further agrees that should he/she predecease
                  Employee or become divorced from Employee, any of the shares
                  of Restricted Stock which such spouse may own or in which
                  he/she may have an interest shall remain subject to this
                  Agreement.

5.       Notices; Deliveries. Any notice or delivery required to be given under
         the terms of this Agreement shall be addressed to the Company at its
         principal office, and any notice or delivery to be given to Employee
         shall be addressed to him or her at the address given by him or her
         beneath his or her signature hereto or such other address as either
         party hereto may hereafter designate in writing to the other. Any such
         notice or delivery shall be deemed to have been duly given when
         addressed as aforesaid, registered or certified mail, and deposited
         (postage or registration or certification fee prepaid) in a post office
         or branch post office regularly maintained by the United States.

6.       Disputes. As a condition of the granting of the Restricted Stock
         hereby, Employee and his or her heirs and successors agree that any
         dispute or disagreement which may arise hereunder shall be determined
         by the Company's Board of Directors in its sole discretion and
         judgment, and that any such determination and any interpretation by the
         Board of Directors of the terms of this grant of Restricted Stock shall
         be final and shall be binding and conclusive, for all purposes, upon
         the Company, Employee, his or her heirs and personal representatives.

<PAGE>

7.       Certificates.

         A.       The certificate(s) representing the shares of Restricted Stock
                  granted hereby will be stamped or otherwise imprinted with the
                  legend required by the Plan with respect to any applicable
                  restrictions on the sale or transfer of such shares, and the
                  stock transfer records of the Company will reflect stop
                  transfer instructions with respect to such shares.

         B.       At the election of the Company, the Company may retain the
                  certificate(s) representing the shares of Restricted Stock
                  granted to Employee pursuant to this Agreement until such time
                  as the vesting restrictions set forth in Section 2 have
                  lapsed. Within a reasonable time thereafter, the Company will
                  deliver to Employee a new certificate representing such
                  shares, free of the legend referred to in paragraph A above.
                  The issuance of such certificate shall not affect any
                  restrictions upon the transferability of such shares pursuant
                  to applicable law or otherwise.

         C.       If the Company elects to issue the certificate(s) representing
                  the shares of Restricted Stock granted hereunder prior to the
                  termination or lapse of the restrictions on vesting, the
                  legend referred to in paragraph A above shall remain on such
                  certificate(s) until such time as the vesting restrictions
                  have terminated or lapsed or are removed by the Board of
                  Directors.

8.       Restricted Stock Subject to Plan. The Restricted Stock granted hereby
         is subject to the Plan. If a conflict exists between any term or
         provision contained herein and a term or provision of the Plan, the
         applicable terms and provisions of the Plan will govern and prevail.

9.       Miscellaneous.

         A.       Employee hereby agrees that (i) Employee is acquiring the
                  Restricted Stock for investment purposes and not with a view
                  to the resale or distribution thereof; (ii) the Company may
                  withhold from Employee any payment or consideration to be paid
                  to Employee by the Company, any tax which the Company believes
                  is required to be withheld with respect to any benefit under
                  the Plan or this Restricted Stock Agreement, and to hold as
                  security for the amount to be withheld any property otherwise
                  distributable to Employee under the Plan until the amounts
                  required to be withheld have been so withheld; and (iii)
                  Employee will make appropriate arrangements with the Company
                  for satisfaction of any applicable federal, state or local
                  income tax, withholding requirements or like requirements.

         B.       If any party to this Agreement so required under this
                  Agreement falls or refuses to comply with the provisions of
                  this Agreement, then in addition to any other remedies
                  provided by law or this Agreement, the party affected thereby
                  may institute and maintain a proceeding to compel the specific
                  performance of this Agreement by the party so defaulting.

         C.       Within 30 days after the date of this Agreement, Employee may
                  make an election with the Internal Revenue Service under
                  Section 83(b) of the Internal Revenue Code and the regulations
                  promulgated thereunder.

<PAGE>

         D.       This Agreement shall be binding upon and inure to the benefit
                  of any successor or successors of the Company.

         E.       The interpretation, performance and enforcement of this
                  Agreement shall be governed by the laws of the State of Texas.

         F.       This Agreement may be executed in multiple counterparts, each
                  of which shall be deemed an original, but all of which
                  collectively shall constitute a single instrument.

         G.       If any one or more of the provisions or parts of a provision
                  contained in this Agreement shall for any reason be held to be
                  invalid, illegal or unenforceable in any respect in any
                  jurisdiction, such invalidity, illegality or unenforceability
                  shall not affect any other provision or part of a provision of
                  this Agreement or any other jurisdiction, but this Agreement
                  shall be reformed and construed in any such jurisdiction as if
                  such invalid or illegal or unenforceable provision or part of
                  a provision had never been contained herein and such provision
                  or part shall be reformed so that it would be valid, legal and
                  enforceable to the maximum extent permitted in such
                  jurisdiction.

         IN WITNESS WHEREOF, the Company has, as of the date and place first
above written, caused this Agreement to be executed on its behalf by its
authorized officer and Employee has hereunto set his or her hand as of the date
and place first above written.

                                            WESTWOOD HOLDINGS GROUP, INC.

                                            By:   /s/ Brian O. Casey
                                                  ------------------------------
                                            Name: Brian O. Casey
                                            Its:  Chief Executive Officer

<PAGE>

                             EMPLOYEE SIGNATURE PAGE
                             -----------------------
                          TO RESTRICTED STOCK AGREEMENT
                          -----------------------------

Employee Name:    __________________________

Signature         __________________________

Address:          __________________________

         I, the undersigned, being the spouse of the above-named Employee,
hereby acknowledge that I have read and understand the foregoing Restricted
Stock Agreement under the Third Amended and Restated Westwood Holdings Group,
Inc. Stock Incentive Plan, and I agree to be bound by the terms thereof.

Spouse Name:      __________________________

Signature         __________________________

Address:          __________________________EX-10.1

AMENDMENT NO. 1 TO

SECURITIES PURCHASE AGREEMENT

AMENDMENT NO. 1, dated as of May 24, 2006 (this “Amendment”), to the Securities
Purchase Agreement, dated as of May 16, 2006 (the “Purchase Agreement”), by and among Sipex
Corporation, a Delaware corporation (the “Company”), and the Buyers listed on the Schedule
of Buyers attached thereto as Exhibit A (each a “Buyer” and collectively, the
“Buyers”). Each capitalized term used and not otherwise defined herein shall have the
meaning assigned to such term in the Purchase Agreement.

WHEREAS, pursuant to the Purchase Agreement, the Company sold to the Buyers, and each Buyer
has severally purchased from the Company, the principal amount of Notes and number of Warrants set
forth opposite their respective names on Exhibit A to the Purchase Agreement;

WHEREAS, the Company and the Buyers desire to modify the Purchase Agreement in accordance with
the provisions of Section 9(f) thereof; and

WHEREAS, the undersigned represent Investors holding at least 66 2/3% of the Conversion Shares
and Warrant Shares, determined as if all of the Notes held by Buyers then outstanding have been
converted into Conversion Shares and all Warrants then outstanding have been exercised for Warrant
Shares without regard to any limitations on the conversion of the Notes or on the exercise of the
Warrants.

NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and
valuable consideration, the sufficiency and receipt of which are hereby acknowledged, the parties
hereto agree as follows:

Section 1. Amendments to the Purchase Agreement. 

(a) Section 4 of the Purchase Agreement shall be amended to add Section 4(aa) which shall read
as follows:

DTC Settlement. The Company will use its reasonable best efforts to make the
Notes and Warrants, other than the Notes and Warrants issued to Rodfre Holdings LLC,
eligible to be registered for settlement through DTC no later than fifteen (15) days
following the satisfaction of the Exchange Act Filing Condition (as defined in the
Indenture).

Section 2. Acknowledgement of Scrivener’s Error. The parties hereby acknowledge that
the inclusion of the “Acknowledged and Agreed” signature block for Piper Jaffray & Co. was a
scrivener’s error and that Piper Jaffray’s acknowledgement was unnecessary for the execution of the
Purchase Agreement.

Section 3. Governing Law. All questions concerning the construction, validity,
enforcement and interpretation of this Amendment shall be governed by the internal laws of the
State of New York, without giving effect to any choice of law or conflict of law provision or rule
(whether of the State of New York or any other jurisdictions) that would cause the application of
the laws of any jurisdictions other than the State of New York.

Section 4. Counterparts. This Amendment may be executed in identical counterparts,
each of which shall be deemed an original but all of which shall constitute one and the same
agreement. This Amendment, once executed by a party, may be delivered to the other parties hereto
by facsimile transmission of a copy of this Agreement bearing the signature of the party so
delivering this Amendment.

Section 5. Headings. The headings of this Amendment are for convenience of reference
only and shall not limit or otherwise affect the meaning thereof.

Section 6. Effect of Amendment. Except as expressly amended by this Amendment, the
Purchase Agreement shall remain in full force and effect as the same was in effect immediately
prior to the effectiveness of this Amendment. All references in the Purchase Agreement to “this
Agreement” shall be deemed to refer to the Purchase Agreement as amended by this Amendment.

1

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed
by their respective authorized officers as of the day and year first above written.

	 	 	 
	SIPEX CORPORATION

By:

	 	

   /s/    Ralph Schmitt                                  
	
 
	 	 
	
 
	 	Name: Ralph Schmitt

Title: President and Chief Executive Officer

	 	 	BUYERS

(print full legal name of Buyer)

By:

 (signature of authorized representative)

Name:

Its:

2

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective authorized officers as of the day and year first above written.

	 	 	 
	SIPEX CORPORATION

By:

	 	

                                     
	
 
	 	 
	
 
	 	Name: Ralph Schmitt

Title: President and Chief Executive Officer

BUYERS

Rodfre Holding LLC

(print full legal name of Buyer)

By: /s/ Joe Prudente, Manager and Director

 (signature of authorized representative)

Name: Joe Prudente, Manager and Director

Its:

3

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective authorized officers as of the day and year first above written.

	 	 	 
	SIPEX CORPORATION

By:

	 	

                                     
	
 
	 	 
	
 
	 	Name: Ralph Schmitt

Title: President and Chief Executive Officer

BUYERS

Quantum Partners LDC

(print full legal name of Buyer)

By: /s/ Jay A. Schoenfarber

 (signature of authorized representative)

Name: Jay A Schoenfarber

Its: Attorney-in-Fact

4

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective authorized officers as of the day and year first above written.

	 	 	 
	SIPEX CORPORATION

By:

	 	

                                     
	
 
	 	 
	
 
	 	Name: Ralph Schmitt

Title: President and Chief Executive Officer

BUYERS

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY

(print full legal name of Buyer)

By: /s/ Jerome R. Baier

 (signature of authorized representative)

Name: Jerome R. Baier

Its: Authorized Representative

5

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective authorized officers as of the day and year first above written.

	 	 	 
	SIPEX CORPORATION

By:

	 	

                                     
	
 
	 	 
	
 
	 	Name: Ralph Schmitt

Title: President and Chief Executive Officer

BUYERS

THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY FOR ITS GROUP
ANNUITY SEPARATE ACCOUNT

(print full legal name of Buyer)

By: /s/ Jerome R. Baier

 (signature of authorized representative)

Name: Jerome R. Baier

Its: Authorized Representative

6

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