Document:

Salaries for the Named Executive Officers

 Exhibit 10.3 
  
 Summary of Fiscal 2005 Salaries 
 for the Named Executive Officers 
 of Sigma-Aldrich Corporation 
  
 The following table sets forth the fiscal 2005 salaries for each of the Company’s named
executive officers: 
  

				
	 	  	 Fiscal 2005
 Salary

	 David R. Harvey
 Chairman & Chief
 Executive Officer
	  	$	725,000
		
	 Michael R. Hogan
 Chief Administrative Officer,
 Chief Financial Officer & Secretary
	  	$	430,000
		
	 David W. Julien
 President, Biotechnology
	  	$	310,000
		
	 Jai. P. Nagarkatti
 President & Chief Operating
 Officer, President Scientific Research
	  	$	470,000
		
	 Frank D. Wicks
 President, SAFC
	  	$	320,000

  
 The Company’s Compensation
Committee reviews with the CEO an annual salary plan for the Company’s executive officers and then approves such plan with any modifications it deems appropriate. The Committee approves the salary plan after assessing the Company’s overall
performance, including a general review of the operating results of the Company, its competitors and its peers, the executive officers’ responsibilities and performance and compensation received by executives in similar positions. The review of
operating results is general in nature. In reviewing the individual executive officers’ responsibilities and performance, the Committee also considers their non-financial contributions to the Company, such as the quality and progress of
research, marketing, production and process improvement activities. The Committee performs its review in a general, subjective manner with consideration given to all factors. The Committee generally believes that salaries for the Company’s
executive officers should be at the 50th percentile of comparable companies if performance is similar to those peer companies. The named executive officers are eligible for cash bonuses up to 66.6% of their annual salaries. 
  

 21Specimen Unit Certificate

 Exhibit 4.1 
  
 SPECIMEN UNIT CERTIFICATE 
  

					
	NUMBER:                     	  	 	  	UNITS:                     -U
			
	 	  	 	  	    SEE REVERSE FOR
	 	  	 	  	    CERTAIN DEFINITIONS

  
 OAKMONT ACQUISITION
CORP. 
  
 CUSIP:
             
  
 UNIT 
  
 UNITS CONSISTING OF
ONE SHARE OF COMMON STOCK AND TWO 
 WARRANTS EACH TO PURCHASE ONE SHARE OF COMMON STOCK 
  
 THIS CERTIFIES THAT
                         is the owner of             
Units. 
  
 Each Unit (“Unit”) consists of
one (1) share of common stock, par value $.0001 per share (“Common Stock”), of Oakmont Acquisition Corp., a Delaware corporation (the “Company”), and two warrants (the
“Warrants”). Each Warrant entitles the holder to purchase one (1) share of Common Stock for $5.00 per share (subject to adjustment). Each Warrant will become exercisable on the later of (i) the Company’s completion of a
merger, capital stock exchange, asset acquisition or other similar business combination or (ii)                     , 2006 and will expire
unless exercised before 5:00 p.m., New York City local time, on                     , 2009, or earlier upon redemption (the
“Expiration Date”). The Common Stock and Warrants comprising the Units represented by this certificate are not transferable separately prior to
                    , 2005, subject to earlier separation in the discretion of Morgan Joseph & Co. Inc. The terms of the Warrants are
governed by a Warrant Agreement, dated as of                     , 2005, between the Company and Continental Stock Transfer & Trust
Company, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant Agreement are on file at the office of
the Warrant Agent at 17 Battery Place, New York, New York 10004, and are available to any Warrant holder on written request and without cost. This certificate is not valid unless countersigned by the Transfer Agent and Registrar of the Company.

  
 Witness the facsimile seal of the Company and the facsimile signature of its
duly authorized officers. 
  
  

			
	Dated:
                            

  

					
	
	 	 	 	

	Chief Executive Officer	 	 	 	Secretary
	 	 	 	 	 

  
 OAKMONT ACQUISITION
CORP. 
 CORPORATE SEAL 
 2005

 DELAWARE 

 OAKMONT ACQUISITION CORP. 
  
 The Company will furnish without charge to each stockholder who so requests, a statement of the powers, designations,
preferences and relative, participating, optional or other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences and/or rights. 
  
 The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
  
 “TEN COM” - as tenants in common 
 “TEN ENT” - as tenants by the entireties 
 “JT TEN” - as joint tenants with right of survivorship and not as
tenants in common 
 “UNIF GIFT MIN ACT” -              Custodian
             
                                        
     (Cust)                    (Minor) 
                                 under Uniform Gifts to
Minors Act                      (State) 
  
 Additional Abbreviations may also be used though not in the above list. 
  
 For value received,
                                        
hereby sell, assign and transfer unto 
  
  

	
	

	 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

  

	
	

	(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE)

  
                      Units represented by the within Certificate, and do hereby irrevocably constitute and appoint
                             Attorney to transfer the said Units on the books of the within named
Company will full power of substitution in the premises. 
  
 Dated
                             
  

	
	

	NOTICE: The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change
whatever.

  

	
	 Signature(s) Guaranteed:

	
	

	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).Specimen Common Stock Certificate

 Exhibit 4.2 
  

SPECIMEN COMMON STOCK CERTIFICATE 
  

			
	 NUMBER:
                    
	 	SHARES:                     -C

  
 OAKMONT ACQUISITION
CORP. 
  
 INCORPORATED UNDER THE LAWS OF THE STATE OF
DELAWARE 
  
 COMMON STOCK 
  

					
	 	  	 	  	SEE REVERSE FOR
	 	  	 	  	CERTAIN DEFINITIONS
		
	THIS CERTIFIES THAT                                 
                        	  	CUSIP:
                                
		
	IS THE OWNER OF	  	 

  
 FULLY PAID AND
NON-ASSESSABLE SHARES OF THE PAR VALUE OF $.0001 EACH 
 OF THE COMMON STOCK OF 
  
 OAKMONT ACQUISITION CORP. 
  
 transferable on the books of the Corporation in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid
unless countersigned by the Transfer Agent and registered by the Registrar. Witness the seal of the Corporation and the facsimile signatures of its duly authorized officers. 
  

			
	 Dated:
                            

  

					
	
	 	 	 	

	 Chief Executive Officer
	 	 	 	Secretary

  
 OAKMONT ACQUISITION
CORP. 
 CORPORATE SEAL 
 2005

 DELAWARE 

 The following abbreviations, when used in the inscription on the face of this certificate, shall be
construed as though they were written out in full according to applicable laws or regulations: 
  
 “TEN COM”- as tenants in common 
 “TEN ENT”- as tenants by the entireties 
 “JT TEN”- as joint tenants with right of survivorship and not as
tenants in common 
 “UNIF GIFT MIN ACT”-              Custodian
                             
                                        
     (Cust)                    (Minor) 
  
                                     under Uniform Gifts to
Minors Act                      (State) 
  
 Additional Abbreviations may also be used though not in the above list. 
  
 OAKMONT ACQUISITION CORP. 
  
 The Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and
shall be held subject to all the provisions of the Certificate of Incorporation and all amendments thereto and resolutions of the Board of Directors providing for the issue of shares of Preferred Stock (copies of which may be obtained from the
secretary of the Corporation), to all of which the holder of this certificate by acceptance hereof assents. 
  
 For value received,
                                        
     hereby sell, assign and transfer unto 
  
  

	
	

	(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

  

	
	
 
	 (PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE)

  
                      shares of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and
appoint                      Attorney to transfer the said stock on the books of the within named Corporation will full power of substitution
in the premises. 
  

			
	Dated	 	__________
	 	 	 

  

	
	

	NOTICE: The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change
whatever.

  

	
	Signature(s) Guaranteed:
	
	

	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE
GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).

  
 The holder of this certificate shall
be entitled to receive funds from the trust fund only in the event of the Company’s liquidation or if the holder seeks to convert his respective shares into cash upon a business combination which he voted against and which is actually completed
by the Company. In no other circumstances shall the holder have any right or interest of any kind in or to the trust fund.

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