Document:

Exhibit 10.4

 Exhibit 10.4 
 AMENDMENT NO. 3 TO THE EMPLOYMENT AGREEMENT 
 This AMENDMENT NO. 3 TO THE
EMPLOYMENT AGREEMENT (this “Amendment”) is entered into this      day of December, 2010, by and between Hudson Holding Corporation (the “Company”) and Keith R. Knox
(“Employee”). 
 WHEREAS, the parties hereto are parties to that certain Employment Agreement,
dated as of January 1, 2007, as amended by that certain Amendment No. 2 to the Employment Agreement, dated as of October 12, 2009 (which superseded and replaced that certain Amendment No. 1 to the Employment Agreement, dated as
of May 19, 2008) (the “Employment Agreement”); and 
 WHEREAS, the Company and Employee
desire to amend certain provisions of the Employment Agreement to ensure compliance with Section 409A of the Internal Revenue Code of 1986, as amended, and as permitted in accordance with Internal Revenue Service Notice 2010-6. 

NOW THEREFORE, in consideration of the mutual promises set forth herein, it is mutually agreed between the parties that the
Employment Agreement shall be amended, effective as of January 1, 2009, as follows: 
 1. Subsection (a) and
(b) of Section 12 and subsection (a)(i) and (a)(ii) of Section 13 are each hereby amended by adding the phrase, “Subject to the provisions of Section 26,” to the beginning of each such subsection. 

2. Section 14(a) is hereby amended by adding the phrase, “Subject to the provisions of Section 26,” to the beginning
of such section. 
 3. The Employment Agreement is hereby amended by adding the following new Section 26: 

26. Section 409A. Each payment under this Agreement is intended to be exempt from or in compliance with
Section 409A (“Section 409A”) of the Internal Revenue Code of 1986, as amended (the “Code”), and the provisions of this Agreement will be administered, interpreted and construed accordingly. Without limiting the generality
of the foregoing, the term “termination of employment” or any similar term under the Agreement will be interpreted to mean “separation from service” within the meaning of Section 409A to the extent necessary to comply with
Section 409A. If any provision of this Agreement (or of any award of compensation, including equity compensation or benefits) would cause Employee to incur any additional tax or interest under Section 409A and accompanying Treasury
Regulations and guidance, the Company shall, after consulting with Employee, reform such provision to comply with Section 409A, to the extent permitted under Section 409A; provided, however, that the Company agrees to
maintain, to the maximum extent practicable, the original intent and economic benefit to Employee of the applicable provision without violating the provisions of Section 409A. Notwithstanding any provision to the contrary in this Agreement, if
Employee has a termination of employment (other than by reason of death), is deemed on his date of termination to be a “specified employee” within the meaning of that term under Section 409A(a)(2)(B) of the Code and the Company is a
public company, then the payments and benefits under this Agreement that are payable upon a termination of employment and subject to Section 409A shall be made or provided on the later of (A) the payment date set forth in this Agreement or
(B) the date that is the earliest of (i) the expiration of the six-month period measured from the date of termination, or (ii) the date of Employee’s death, in either case without interest for such

  
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delay. To the extent any reimbursements or in-kind benefits provided to Employee pursuant to this Agreement are subject to Section 409A, including without limitation any health plan benefits
subject to Section 409A or expenses paid or reimbursed pursuant to Section 6, then in accordance with Section 409A: (A) the amount of expenses eligible for reimbursement or in-kind benefits provided during Employee’s taxable
year shall not affect the expenses eligible for reimbursement or in-kind benefits provided in any other taxable year; (B) the reimbursement must be made on or before the last day of Employee’s taxable year following the taxable year in
which the expense was incurred; and (C) the right to reimbursement or in-kind benefits is not subject to liquidation or exchange for another benefit. 
 4. Except as expressly modified and superseded by this Amendment, the terms and provisions of the Employment Agreement shall continue in full force and effect. 

This Amendment may be executed in multiple counterparts, each of which shall be deemed to be an original and all of which, taken
together, shall constitute one and the same agreement. 
 * * * * * * * * * * 

[Remainder of Page Intentionally Left Blank 
 Signature Page Follows.] 

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

			
	HUDSON HOLDING CORPORATION
		
	 By:
	 	
 

			
	 Name:
	 	
 

			
	 Title:
	 	  

	
	EMPLOYEE
	
	  

	 Keith R. Knox

  
 3Retention Agreement - Michael C. Jennings

 Exhibit 10.1 
 EXECUTION 
 RETENTION AND ASSUMPTION AGREEMENT 

This Retention and Assumption Agreement (this “Agreement”) is made as of February 21, 2011, by and among Frontier Oil
Corporation, a Wyoming corporation (“Frontier”), Holly Corporation, a Delaware corporation (“Holly”), and Mike Jennings (the “Executive”). 
 1. Preamble. This Agreement is entered into in contemplation of certain transactions described in that Agreement and Plan of Merger by and among Holly, North Acquisition, Inc. and Frontier dated as
of February 21, 2011 (the “Merger Agreement”). The undertakings set forth in Section 2 below shall become effective immediately prior to the Closing (the “Effective Time”), provided that upon termination of the Merger
Agreement under Article 7 thereof this Agreement shall terminate and have no effect. Notwithstanding the above, the parties hereto acknowledge adequate consideration for the entering into of this Agreement, and this Agreement may not be terminated
or repudiated unilaterally by either party. This Agreement incorporates a Schedule, attached hereto, and labeled Schedule A, identifying certain “Restricted Stock Agreements” as so identified thereon, and certain “Stock
Unit/Restricted Stock Agreements,” also as so identified thereon, which shall collectively be referred to as the “Executive Stock Agreements.” Capitalized terms used and not defined herein have the meanings given such terms in the
Merger Agreement. 
 2. Waiver. Effective as of the Effective Time Executive waives the following rights in respect of
any shares of Restricted Stock held under any Executive Stock Agreement as of the Effective Time (such shares of Restricted Stock, as held on the date of this Agreement, being listed on Schedule A): 

(a) automatic 100% vesting of the Restricted Stock under Section 2(c) of any Restricted Stock Agreement, or under Section 3(c)
of any Stock Unit/Restricted Stock Agreement, upon the occurrence of a “Change in Control” as such term is defined in the Frontier Oil Corporation Omnibus Incentive Compensation Plan (the “Plan”) on account of the filing of the
Registration Statement, the Closing or any other transaction contemplated by the Merger Agreement, 
 (b) automatic vesting in
full upon a voluntary termination of employment as described under Section 7.02(b)(iv) of the Executive’s Change in Control Severance Agreement dated December 30, 2008 (the “Severance Agreement”) based solely on a breach by
Holly of the first sentence of Section 3.04 of the Severance Agreement, and 
 (c) automatic vesting in full upon a
voluntary termination of employment described under Section 7.02(c) of the Severance Agreement, 
 provided that the Executive is not
waiving any other rights, including rights to automatic vesting, under any other terms of the Executive Stock Agreements or the Severance Agreement. 

  
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 For clarity, (i) any rights of the Executive in respect of Frontier Stock Units held
under the Executive Stock Agreements at the Effective Time (including rights in respect of shares of Frontier Restricted Stock issuable in exchange for those Frontier Stock Units) shall be unaffected by the waiver described above, and shall instead
be determined under the terms of the Stock Unit/Restricted Stock Agreements as in effect at the Effective Time, (ii) any dividends or dividend equivalent amounts with respect to Frontier Stock Units or Frontier Restricted Stock under the
Executive Stock Agreements accrued but unpaid at the Effective Time shall be paid out on the Closing, and (iii) any dividends with respect to Holly Restricted Stock held pursuant to the Executive Stock Agreements, as assumed by Holly as
provided below, shall be paid as and when such dividends are paid to holders of unrestricted stock of the same class. 
 3.
Assumption. At the Closing, Holly shall assume 
 (a) all of the obligations of Frontier under the Executive Stock
Agreements, which shall then apply to all of the Holly Restricted Stock issued as contemplated in Section 2.3(c) of the Merger Agreement in respect to Frontier Restricted Stock held under the Executive Stock Agreements, subject only to the
modifications described in Section 2 of this Agreement, and 
 (b) all of the obligations of Frontier under the Severance
Agreement subject only to the following modifications: 
 (i) The Executive’s written notice under Section 1.01 to
extend the term of the Severance Agreement to the third anniversary of the CiC Date shall be deemed given and the term shall extend accordingly. 
 (ii) Section 7.01(a) of the Severance Agreement shall be amended and restated to read in its entirety as follows: 
 “[t]he Company shall pay to the Executive (or his dependents, beneficiaries or estate as the case may be), within 30 days following his Termination of Employment, a lump sum amount equal to 6.0 times
his annual Base Salary as provided in Section 4.01(a).” 
 (iii) The Executive shall waive the right to assert that a
relocation of his principal place of employment to Dallas, Texas constitutes a breach of the Severance Agreement or otherwise constitutes grounds for a “Termination of Employment” under Section 7.02(b) of the Severance Agreement.

 (iv) Section 7.02(c), enabling the Executive voluntarily to effect a “Termination of Employment” during the
sixty day period following the first anniversary of the CiC, date shall be deleted. 

  
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 4. Reimbursement. Holly shall reimburse the Executive as provided below for

 (a) any increased net Federal state and local income tax incurred directly or indirectly by the Executive in the aggregate as
a result of a change in the year of inclusion in income arising from a failure of any nonqualified deferred compensation plan to comply with any requirements of Section 409A of the Internal Revenue Code of 1986, as amended (the
“Code”), or 
 (b) any interest or other amount added to tax under Section 409A(B)(i)(I) or (II) of the Code

 (in either case the “Increased Taxes”), such reimbursement (the “Reimbursement”) to be in an amount which, after
reduction of any net Federal, state or local taxes of any kind (including excise taxes) on the Reimbursement, shall equal the Increased Taxes. The Reimbursement in respect of any amount of Increased Taxes shall be paid immediately prior to the due
date for the payment of any Increased Taxes, provided Holly shall not be required to pay any Reimbursement prior to 30 days after the date of any written notice from the Executive setting forth the amount of such Increased Taxes. 

5. Miscellaneous. 
 5.1 Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Texas without regard to principles of conflicts of law. 

5.2 Successors and Assigns. The provisions hereof shall inure to the benefit of, and be binding upon, the
successors, assigns, heirs, executors, and administrators of the parties hereto. 
 5.3 Entire Agreement.
This Agreement constitutes the full and entire understanding and agreement between the parties with regard to the subject matter hereof and supersedes all prior oral or written (and all contemporaneous oral) agreements or understandings with respect
to the subject matter hereof. 
 5.4 Counterparts. This Agreement may be executed in any number of
counterparts, each of which may be executed by less than all of the parties hereto, each of which shall be enforceable against the parties actually executing such counterparts, and all of which together shall constitute one instrument. 

5.5 Notice. Any notice, request or other communication required or permitted under this Agreement (a
“Notice”) shall be in writing, addressed as provided below, and shall be deemed to be effective and properly given: (a) when delivered, if delivered in person; (b) when sent, if sent by facsimile or other electronic means and
confirmation of receipt is received; (c) three (3) days after being sent by certified or registered United States mail, return receipt requested; or (d) the date designated as the delivery date, if sent by nationally recognized
overnight courier. All Notices not delivered personally or by facsimile or other electronic means shall be sent with postage and other charges prepaid and properly addressed to the party to be notified at the address set forth for such party on the
signature page of this Agreement; any party (and such party’s permitted assigns) may change such party’s address for receipt of future Notices by giving written Notice to the other parties in the manner provided herein for giving Notice.

  
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 5.6 Amendments. The provisions of this Agreement may be amended at
any time and from time to time, and particular provisions of this Agreement may be waived, only by an agreement or consent in writing signed by Frontier, Holly and the Executive. 

[Remainder of Page Intentionally Left Blank] 

  
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 IN WITNESS WHEREOF, Frontier, Holly and the Executive have caused this Agreement to be
executed as of the date first above written. 
  

			
	FRONTIER OIL CORPORATION
		
	By:	 	 /s/ Doug S. Aron

	Name:	 	Doug S. Aron
	Title:	 	Executive Vice President and Chief Financial Officer
	
	Address for Notices:
	10000 Memorial Drive, Suite 600
	Houston, Texas 77024-3411
	Fax: (713) 688-0616
	Telephone: (713) 688-9600
	
	HOLLY CORPORATION
		
	By:	 	 /s/ Matthew P. Clifton

	Name:	 	Matthew P. Clifton
	Title:	 	Chief Executive Officer
	
	Address for Notices:
	100 Crescent Court, Suite 1600
	Dallas, Texas 75201-6915
	Fax: (214) 871-3560
	Telephone: (214) 871-3555
		
	By:	 	 /s/ Michael C. Jennings

	Name:	 	Michael C. Jennings
	
	Address for Notices:
	10000 Memorial Drive, Suite 600
	Houston, Texas 77024-3411
	Fax: (713) 688-0616
	Telephone: (713) 688-9600

  
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 Schedule A 
 Michael C. Jennings - Restricted Stock and Stock Unit/Restricted Stock Award Agreements 
  

																	
	 Type of Award Agreement
	  	Date of
Grant	 	  	Number of
Restricted
Shares/Units
Granted	 	  	Number of
Unvested
Restricted Shares	 	  	Number of
Unvested Units	 
	 Restricted Stock
	  	 	3/24/08	  	  	 	15,862	  	  	 	7,931	  	  	 	N/A	  
	 Restricted Stock
	  	 	2/24/09	  	  	 	42,744	  	  	 	32,058	  	  	 	N/A	  
	 Restricted Stock
	  	 	3/25/09	  	  	 	8,929	  	  	 	6,697	  	  	 	N/A	  
	 Restricted Stock
	  	 	2/23/10	  	  	 	66,000	  	  	 	66,000	  	  	 	N/A	  
	 2008 Stock Unit/Restricted Stock
	  	 	2/27/08	  	  	 	42,857	  	  	 	5,953	  	  	 	12,671	  
	 2009 Stock Unit/Restricted Stock
	  	 	2/24/09	  	  	 	99,736	  	  	 	55,409	  	  	 	33,245	  
	 2010 Stock Unit/Restricted Stock
	  	 	2/23/10	  	  	 	99,000	  	  	 	0	  	  	 	99,000	  

  
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