Document:

Exhibit 4.1

 Exhibit 4.1 
 COMMON STOCK PURCHASE WARRANTS 
 GREEN PLAINS RENEWABLE ENERGY, INC. 
 Incorporated Under the Laws of the State of Iowa 
  

			
	 No. – A                
	 	                  Common
Stock
 Purchase Warrants

 CERTIFICATE FOR COMMON STOCK 
 PURCHASE WARRANTS 
 GREEN PLAINS RENEWABLE ENERGY, INC., an Iowa corporation (the
“Company”), for value received, hereby certifies that
                                        ,
or registered assigns (the “Holder”), is the registered owner of the above indicated number of Warrants. One (1) Warrant entitles the Holder to purchase 1/5th of a share of the Company’s common stock, $.001 par value (the “Common Stock”). The Common Stock issuable upon an exercise of this Warrant is
sometimes herein referred to as the “Warrant Stock” and the shares of such Warrant Stock are sometimes herein referred to as the “Warrant Shares.” 
 1. Purchase Price. The purchase price (the “Exercise Price”) per share for the Warrant Stock shall be $60.00 per share, subject to adjustment hereunder, tendered to the Company as provided in
Section 3 hereof. 
 2. Rights to Exercise. The Holder shall have the right (but not the obligation) to exercise the Warrant, in
whole in or in part, to receive the Warrant Stock, subject to adjustment hereunder, at any time on or before December 31, 2008 (the “Exercise Period”). 
 3. Manner of Exercise. In order to exercise this Warrant, the Holder shall surrender this Warrant certificate at the office of the Company, as set forth below, or at such other address within the State of Iowa
as the Company shall designate in writing, together with a duly executed exercise form in the form attached hereto and simultaneous payment in full (in cash or by certified or official bank or bank cashier’s check payable to the order of the
Company or by offset of obligations then owed by the Company to the Holder) of the purchase price for the Warrant Stock. Fractional shares will not be issued upon the exercise of Warrants, and no payment will be made with respect to any fractional
share of common stock to which any warrant holder might otherwise be entitled upon exercise of Warrants. 
 Upon surrender of this Warrant
certificate in conformity with the foregoing provisions, the Company shall promptly deliver to or upon the written order of the Holder a stock certificate or certificates representing the Warrant Stock. 
 4. Adjustments upon Certain Events. 
 4.1 Stock Splits, Stock Combinations and Certain Stock Dividends. If the Company shall at any time subdivide or combine its outstanding Common Stock, or declare a dividend in Common Stock or other securities of the Company
convertible into or exchangeable for Common Stock, a Warrant shall, after such subdivision or combination or after the record date for such dividend, be exercisable for that number of shares of Common Stock and other securities of the Company that
the Holder would have owned immediately after such event with respect to the Common Stock and other securities for which a Warrant may have been exercised immediately before such event had the Warrant been exercised immediately before such event.
Any adjustment under this Section 4.1 shall become effective at the close of business on the date the subdivision, combination or dividend becomes effective. 

 4.2 Adjustment for Reorganization, Consolidation, Merger. In case of any reorganization of the
Company (or any other corporation the stock or other securities of which are at the time receivable upon exercise of a Warrant) or in case the Company (or any such other corporation) shall merge into or with or consolidate with another corporation
or convey all or substantially all of its assets to another corporation or enter into a business combination of any form as a result of which the Common Stock or other securities receivable upon exercise of a Warrant are converted into other stock
or securities of the same or another corporation, then and in each such case, the Holder of a Warrant, upon exercise of the purchase right at any time after the consummation of such reorganization, consolidation, merger, conveyance or combination,
shall be entitled to receive, in lieu of the shares of Common Stock or other securities to which such Holder would have been entitled had he exercised the purchase right immediately prior thereto, such stock and securities which such Holder would
have owned immediately after such event with respect to the shares Common Stock and other securities for which a Warrant may have been exercised immediately before such event had the Warrant been exercised immediately prior to such event.

 4.3 Notice. In each case of an adjustment in the Common Stock or other securities receivable upon the exercise of a Warrant, the
Company shall promptly notify the Holder of such adjustment. Such notice shall set forth the facts upon which such adjustment is based. 
 5.
Call Option. The Company shall have the right and option, upon no less than twenty (20) trading days’ written notice to the Holder, to call, and thereafter to redeem and acquire all of the Warrants remaining outstanding and unexercised
at the date fixed for such redemption in such notice (the “Redemption Date”), which Redemption Date shall be at least 20 trading days after the date of such notice, for an amount equal to One-Tenth of One Cent ($.001) per Warrant;
provided, however, that (i) the Holder shall have the right during the period between the date of such notice and the Redemption Date to exercise the Warrants in accordance with the provisions of Section 3 hereof and (ii) this call option may be
exercised by the Company only if the closing price of the Company’s common stock as reported on the Nasdaq Capital Market or on the other principal securities exchange or trading market on which the common stock is traded, listed or quoted
equals or exceeds $72 per share for the twenty (20) consecutive trading days immediately prior to the exercise of this call option by the Company. All such determinations shall be appropriately adjusted for any stock dividend, stock split, stock
combination or other similar transaction during the applicable calculation period. Said notice of redemption shall require the Holder to surrender to the Company, not later than on the Redemption Date, at the principal executive offices of the
Company, Holder’s certificate or certificates representing the Warrants to be redeemed. Notwithstanding the fact that any Warrants called for redemption have not been surrendered for redemption and cancellation on the Redemption Date, after the
Redemption Date such Warrants shall be deemed to be expired and all rights of the Holder of such unsurrendered Warrants shall cease and terminate, other than the right to receive the redemption price of $.001 per Warrant for such Warrants, without
interest. 
 Call Option. The Company shall have the right and option, upon no less than twenty (20) trading days 
 In connection with any call hereunder, the Company shall have no obligation to call any other stock purchase warrant or warrants, whether or not having
similar terms, and no call made pursuant to any other stock purchase warrant shall obligate the Company to exercise its right and option to make a call hereunder. 
 6. Loss, Theft, Destruction, or Mutilation. Upon receipt by the Company of evidence reasonably satisfactory to it of the ownership of and the loss, theft, destruction or mutilation of this Warrant and (in the
case of loss, theft, or destruction) of indemnity satisfactory to it (in the exercise of its reasonable discretion), and (in the case of mutilation) upon surrender and cancellation thereof, the Company will execute and deliver, in lieu thereof, a
new Warrant in the same form and tenor. 
 7. Reservation of Shares Issuable on Exercise of Warrant. The Company will at all times
reserve and keep available out of its authorized shares, solely for issuance upon the exercise of the Warrant, such shares of its Common Stock and other securities as from time to time shall be issuable upon the exercise of the Warrant. 

8. Miscellaneous. 
 8.1
Governing Law. This Warrant shall be construed in accordance with, and governed by the substantive laws of, the State of Iowa. 
 8.2
Assignment. The benefit of this Warrant and of the Warrant Stock represented hereby may be assigned and transferred by the Holder and its assigns in accordance with any applicable securities laws and regulations; however, the obligations of
the Company and its successors may not be delegated without the prior written consent of the Holder hereof. Subject to the foregoing, this Warrant shall be binding upon and inure to the benefit of the parties and their respective legal
representatives, successors, agents, heirs and assigns. 
  

 2 

 8.3 Enforcement. In the event of a dispute between the parties arising under this Warrant, the
party prevailing in such dispute shall be entitled to collect such party’s costs and expenses from the other party, including without limitation court costs and reasonable attorneys’ fees. 
 8.4 Notices. All notices, requests, consents and demands shall be given to the Company at 7945 West Sahara, Suite 107, Las Vegas, Nevada 89117,
and to the Holder at the address shown on the records of the Company as provided by the Holder. All notices, requests, consents and demands shall be given or made by personal delivery, by confirmed air courier, by telecopy or by certified first
class mail, return receipt requested, postage prepaid, to the party addressed as aforesaid. If sent by confirmed air courier, such notice shall be deemed to be given on the earlier to occur of the date actually received by the addressee or the
business day on which delivery is made at such address as confirmed by the air courier. If mailed, such notice shall be deemed to be given on the earlier to occur of the date actually received by the addressee or the third business day following the
date upon which it is deposited in a first-class postage-prepaid envelope in the United States mail addressed to such party’s business address. If given by telecopy, such notice shall be deemed to be given on the business day actually received
by the addressee. 
 8.5 Payment of Taxes. The Holder shall pay all documentary, stamp or similar taxes and other government charges
that may be imposed with respect to the issuance, transfer or delivery of any Warrant Stock on exercise of the Warrants. In the event the Warrant Stock are to be delivered in a name other than the name of the Holder of the Warrant Certificate, no
such delivery shall be made unless the person requesting the same has paid the amount of any such taxes or charges incident thereto. 
 8.6
Reduction in Exercise Price at Company’s Option. The Company’s Board of Directors may, at its sole discretion, reduce the Exercise Price of the Warrants in effect at any time either for the life of the Warrants or any shorter period
of time determined by the Company’s Board of Directors. The Company shall promptly notify the Holders of any such reduction in the Exercise Price. 
 IN WITNESS WHEREOF, the Company has caused this Warrant to be duly executed as of the          day of
                    , 2006. 
  

			
	GREEN PLAINS RENEWABLE ENERGY, INC., an Iowa corporation
		
	 By:
	 	  

	 Its:
	 	 President

  

 3 

 GREEN PLAINS RENEWABLE ENERGY, INC. 
 The following abbreviations, when used in the inscription on the face of this instrument, 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 
 JR TEN - as joint tenants with right of survivorship and not as tenants in common 
 UNIF TRANS MIN ACT -                     
(Custodian for Minor) as custodian for                      (name of minor) under the Uniform Transfers to Minors Act 
 Additional abbreviations may also be used though not in the above list. 
 FORM OF ASSIGNMENT 
 (To be Executed by the Registered Holder if He or She 

Desires to Assign Warrants Evidenced by the 
 Within Warrant Certificate) 
 FOR VALUE RECEIVED
                                        
hereby sells, assigns and transfers unto
                                        
                                        
(            ) Warrants, evidenced by the within Warrant Certificate, and does hereby irrevocably constitute and appoint
                                        
Attorney to transfer the said Warrants evidenced by the within Warrant Certificates on the books of the Company, with full power of substitution. 
  

					
	 Dated:                                   
 
	 	  
	 	
		 	 Signature
	 	

  

	 	Notice:	The above signature must correspond with the name as written upon the face of the Warrant Certificate in every particular, without alteration or enlargement or any change
whatsoever. 

 Signature Guaranteed:
                                        
                                        

 SIGNATURE MUST BE GUARANTEED BY A COMMERCIAL BANK OR MEMBER FIRM OF ONE OF THE FOLLOWING STOCK EXCHANGES: NEW YORK STOCK EXCHANGE, PACIFIC COAST STOCK
EXCHANGE, AMERICAN STOCK EXCHANGE, OR MIDWEST STOCK EXCHANGE. 

 FORM OF ELECTION TO PURCHASE 
 (To be Executed by the Holder if Holder Desires to Exercise 
 Warrants Evidenced by the Warrant Certificate)

 To Green Plains Renewable Energy, Inc. 
 The undersigned hereby irrevocably elects to exercise
                                        
(            ) Warrants, evidenced by the within Warrant Certificate for, and to purchase thereunder,
                                        
(            ) full shares of Common Stock issuable upon exercise of said Warrants and delivery of $            
and any applicable taxes. 
 The undersigned requests that certificates for such shares be issued in the name of: 
 PLEASE INSERT SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER 
  

  

 (Please print name and address) 
  

 If said number of Warrants shall not be all the Warrants evidenced by the within Warrant Certificate, the undersigned requests that a
new Warrant Certificate evidencing the Warrants not so exercised be issued in the name of and delivered to: 
  

 (Please print name and address) 
  

  

			
	 Dated:                                
	  	Signature:                                     
                   

  

	 	NOTICE:	The above signature must correspond with the name as written upon the face of the within Warrant Certificate in every particular, without alteration or enlargement or any change
whatsoever, or if signed by any other person the Form of Assignment hereon must be duly executed and if the certificate representing the shares or any Warrant Certificate representing Warrants not exercised is to be registered in a name other than
that in which the within Warrant Certificate is registered, the signature of the holder hereof must be guaranteed. 

 Signature Guaranteed:
                                        
                                        
                     
 SIGNATURE MUST BE GUARANTEED
BY A COMMERCIAL BANK OR MEMBER FIRM OF ONE OF THE FOLLOWING STOCK EXCHANGES: NEW YORK STOCK EXCHANGE, PACIFIC COAST STOCK EXCHANGE, AMERICAN STOCK EXCHANGE, OR MIDWEST STOCK EXCHANGE.Form of Non-Qualified Stock Option Letter Agreement

 EXHIBIT 4.4.2 
 ADVANCED POWER TECHNOLOGY, INC. 
 NON-QUALIFIED STOCK OPTION LETTER AGREEMENT 
 TO: <NAME> 
 The Plan Administrator of the
ADVANCED POWER TECHNOLOGY, INC. (the “Company”) 1995 Stock Option Plan (the “Plan”) is pleased to inform you that you have been selected to receive a grant of a stock option under the Plan. Subject to the terms and
conditions set forth below and in the Plan, you are hereby granted a stock option under the Plan for the purchase of <OPTIONS> shares of the Company’s Common Stock at an exercise price of <EX PRICE> per share. A copy of the Plan is
attached and incorporated into this Agreement by reference. 
 1. Term: The term of the option is ten years from the date of
this Agreement and therefore, to the extent not exercised, will automatically terminate on <TERM DATE>, unless sooner terminated. 
 2. Who May Exercise: During your lifetime, only you can exercise the option. The Plan also provides for exercise of the option by the personal representative of your estate or the beneficiary thereof following your death. You
may use the Notice of Exercise of Stock Option in the form attached to this Agreement when you exercise the option. 
 3. Payment for
Shares: The option may be exercised by the delivery of cash, personal check (unless the Plan Administrator decides at the time of exercise not to accept a personal check), bank certified or cashier’s check. At the sole discretion of the
Plan Administrator, all or part of the required payment may be in the form of a promissory note, according to the terms dictated by the Plan Administrator and the Plan. In addition, payment may be made by transferring shares of Company stock
(acquired by the exercise of this Option or previously owned by you) to the Company as payment of the exercise price. 
 4. Transfer of
Option: The option is not transferable except by will or by the applicable laws of descent and distribution. 

 5. Length of Service Criteria - Vesting: The vesting of options shall be in accordance with
the following table: 
  

			
	 Period of Your Continuous
 Employment with
the Company
 (after the date this option
 is granted)
	  	 Portion of Total Options
 Which is Exercisable

	 12 months
	  	20%
	 24 months
	  	40%
	 36 months
	  	60%
	 48 months
	  	80%
	 60 months
	  	100%

 6. Taxation: The date of grant of this option is <GRANT DATE>. You should
obtain tax advice when exercising your option and before disposing of the shares. The Company makes no representations concerning the tax affect of this option or the subsequent exercise thereof. 
 Please execute the Acceptance and Acknowledgment set forth below on the enclosed copy of this Agreement and return it to the undersigned. 
  

			
	Very truly yours,
	Advanced Power Technology, Inc.
		
	By:	 	  

		
	Its	 	President and Chief Executive Officer

 ACCEPTANCE AND ACKNOWLEDGMENT 
 I, as a resident of the <STATE/COUNTRY>, accept the stock option described above and in the 1995 Stock Option Plan and acknowledge receipt of a
copy of this Agreement, including a copy of the Plan. I have reviewed the Plan and am aware of its terms. 
 Dated:
                     
  

	
	  

	 Optionee’s Signature

	
	  

	Printed Name

 By his or her signature below, the spouse of the Optionee, if such Optionee is legally
married as of the date of this Agreement, acknowledges that he or she has read this Agreement and the Plan and is familiar with the terms and provisions thereof, and agrees to be bound by all the terms and conditions of this Agreement and the Plan.

 Dated:                     

  

	
	  

	Spouse’s Signature
	
	  

	Printed Name

 By his or her signature below, the Optionee represents that he or she is not legally married
as of the date of this Agreement. 
 Dated:
                     
  

	
	  

	 Optionee’s Signature

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