Document:

Regular 2006 Class 3 Employee Common Share Purchase Plan

 Exhibit 4.4 
 PCL EMPLOYEES HOLDINGS LTD. 
 REGULAR EMPLOYEE STOCK PURCHASE PLAN 
 CLASS 3 SERIES ‘06 COMMON VOTING SHARES 
 1. Establishment of Plan. PCL Employees Holdings Ltd. (the “Company”), proposes to sell shares of its Class 3 Series ‘06 Common Voting Shares (the “Plan Shares”) to Eligible Employees (as defined below)
pursuant to this Employee Stock Purchase Plan (the “Plan”). 
 2. Purpose; Nature of Plan. 
 (a) The purpose of this Plan is to provide Eligible Employees with a means of acquiring an equity interest in the Company. Because the
Company’s shares are not publicly traded and are generally nontransferable except to the Company, Eligible Employees do not have an opportunity to acquire an equity interest in the Company except by purchasing directly from the Company. The
Company, by means of the Plan, seeks to enhance the Eligible Employees’ sense of participation in the affairs of the Company and its subsidiaries, and to provide an incentive for such Eligible Employees to exert maximum efforts for the success
of the Company. 
 (b) It is the Company’s practice to determine annually the number, if any, and type of equity
interests to be offered to employees in that year and to adopt one or more employee stock purchase plans pursuant to which such equity interests will be offered in that year. Those plans generally are of two types: (i) “Universal
Plans” under which shares are offered to all employees who have been employed by the Company for a specified period of time, up to a specified aggregate maximum number of shares, and (ii) “Regular Plans” under which shares are
offered to employees selected by the Board of Directors of the Company (the “Board”) based on various criteria, including position, performance and existing share ownership. This Plan is a Regular Plan. References in this Plan to
“Universal Plans” mean all Universal Plans heretofore or hereafter adopted by the Company and references to “Regular Plans” mean this Plan and all other Regular Plans heretofore or hereafter adopted by the Company. The shares of
stock offered each year are identified by a Series designation that indicates the year of issuance and a Class designation that indicates whether such shares are voting or nonvoting and whether such shares were offered in Canada or the United
States. The Class designations are as follows: 
  

			
	 Class 1
	  	 Non-Voting/U.S.

	 Class 2
	  	 Non-Voting/Canada

	 Class 3
	  	 Voting/U.S.

	 Class 4
	  	 Voting/Canada

 References in this Plan to “Common Shares” includes all of the Company’s common shares of all
Series and Classes heretofore or hereafter authorized or issued. 

 3. Shares Available for Issuance. A total of 278,560 Plan Shares is available for issuance
under this Plan. Such number shall be subject to adjustment upon the occurrence of certain events described in Section 10 of this Plan. 
 4. Administration. This Plan shall be administered by the Board, unless and until the Board delegates administration of the Plan to a committee appointed by the Board. As used in this Plan, references to the “Board”
shall include any such committee, if such a committee has been established. Subject to the provisions of this Plan, all questions of interpretation or application of this Plan shall be determined by the Board and its decisions shall be final and
binding upon all participants. All expenses incurred in connection with the administration of the Plan shall be paid by the Company. 
 5.
Eligibility; Participation in the Plan. 
 (a) An “Eligible Employee” shall mean any employee who has
been designated by the Board, in the Board’s sole discretion, as eligible to participate in the Plan. The Board shall determine how many Plan Shares to offer to each Eligible Employee under this Plan based on criteria established by it.

 (b) The Board shall offer Eligible Employees the opportunity to purchase Plan Shares under this Plan on one occasion during
2006. The Board shall establish such forms and procedures as it deems appropriate for making that offer and for the acceptance of the offer by Eligible Employees who elect to purchase. The Board shall have the authority, in its sole discretion, to
modify or waive compliance by any Eligible Employee with any such procedures. 
 6. Purchase Price. The purchase price per
share at which shares of Common Stock will be sold pursuant to this Plan shall be determined by the Board in accordance with Section XI of the PCL Employees Holdings Ltd. Unanimous Shareholder Agreement, as amended from time to time (the
“Shareholder Agreement”). 
 7. Payment of Purchase Price. The purchase price for shares purchased under the Plan
shall be paid by check drawn on a Canadian bank or by bank draft, in each case, payable to the Company in Canadian funds. 
 8. Use of
Proceeds. Proceeds from the sale of shares of Common Stock pursuant to this Plan shall constitute general funds of the Company. 
 9. Termination of Employment. Termination of a participant’s employment for any reason, including disability or death, prior to the actual issuance of a certificate for any shares immediately terminates all of his or her rights
to purchase Plan Shares. For purposes of this Section 9, an employee will be not deemed to have terminated employment or failed to remain in the continuous employ of the Company in the event of (a) a transfer from the Company to any
subsidiary of the Company or from any subsidiary of the Company to the Company or any other subsidiary, or (b) sick leave, military leave, or any other leave of absence approved by the Board. 
 10. Capital Changes. The number of Plan Shares which have been authorized for issuance under this Plan but have not yet been issued and the
purchase price per share shall be proportionately adjusted for any stock split, stock dividend (but only in the form of Common 

  

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Shares), recapitalization, combination or any other increase or decrease in the number of issued and outstanding Common Shares effected without receipt of
any consideration by the Company. Such adjustment shall be made by the Board, whose determination shall be final, binding and conclusive. 
 11. Nonassignability. No rights to purchase or receive Common Shares under this Plan may be assigned, transferred, pledged or otherwise disposed of in any way by the participant. Any attempt to assign, transfer, pledge or otherwise
dispose of such rights shall be void and without effect. 
 12. Shareholder Agreement; Restriction on Transfer. No employee may
purchase shares under this Plan unless and until such employee has signed the Shareholder Agreement and agreed to be bound by the terms and conditions thereof. The shares purchased pursuant to this Plan are subject to the restrictions on transfer
and ownership and the repurchase rights of the Company set forth in the Shareholder Agreement. Shares may not be transferred except in compliance with all applicable laws, including, without limitation, Canadian and United States securities laws. In
addition to any legend required by the Shareholder Agreement, all certificates evidencing shares issued to employees shall bear any legends which, in the Board’s judgment, are necessary to comply with applicable securities laws. 
 13. Reports. Within a reasonable time after the end of each fiscal year, the Company shall prepare and distribute a year-end report to its
shareholders, which report shall include consolidated financial statements of the Company and its subsidiaries for the fiscal year. 
 14.
No Rights to Continued Employment. Neither this Plan nor the grant of the right to purchase shares hereunder shall confer any right on any employee to remain in the employ of the Company or any subsidiary of the Company, or restrict the right
of the Company or any of its subsidiaries to terminate such employee’s employment. 
 15. Notices. All notices or other
communications by a participant under or in connection with the Plan shall be given as provided in the Shareholder Agreement. 
 16. Term;
Shareholder Approval. This Plan shall become effective on the date on which it is adopted by the Board. This Plan shall be approved by the shareholders of the Company, in any manner permitted by applicable corporate law, within 12 months after
the date this Plan is adopted by the Board. This Plan shall continue until the first to occur of (a) termination of this Plan by the Board (which termination may be effected by the Board at any time) or (b) the end of the Company’s
2006 fiscal year. 
 17. Applicable Law. The Plan shall be governed by the substantive laws (excluding the conflict of laws rules) of
the Province of Alberta, Canada. 
 18. Amendments or Termination of this Plan. The Board may, at any time, amend, terminate or extend
the term of this Plan, except no amendment may be made without approval of the stockholders of the Company before or within 12 months after the adoption of such amendment if such amendment would: (a) increase the number of shares that may be
issued under this Plan, or (b) extend the term of this Plan. 
  

 3Non-Competition and Confidentiality Agreement dated as of March 31, 2006

 Exhibit 10.1 
 NON-COMPETITION AND CONFIDENTIALITY AGREEMENT 
 THIS NON-COMPETITION AND CONFIDENTIALITY
AGREEMENT (this “Agreement”) dated the 31st day of March, 2006, is executed by the undersigned
party (the “Undersigned”) and delivered to Prosperity Bancshares, Inc., a Texas corporation (“Prosperity Bancshares”), and Prosperity Bank, a Texas banking association (the “Bank”). Prosperity
Bancshares and the Bank are collectively referred to herein as “Prosperity.” 
 WHEREAS, Prosperity Bancshares and SNB Bancshares,
Inc., a Texas corporation (the “Company”) have entered into that certain Agreement and Plan of Reorganization dated as of November 16, 2005 (the “Merger Agreement”), pursuant to which the Company will merge
with and into Prosperity Bancshares, with Prosperity Bancshares as the surviving entity (the “Merger”); 
 WHEREAS,
Prosperity Bancshares has required as a condition to consummation of the Merger that the Undersigned execute and deliver this Agreement for the benefit of Prosperity; 
 WHEREAS, the Undersigned will receive pecuniary and other benefits as a result of the Merger; 
 WHEREAS, the
Undersigned, as a director, executive officer and/or shareholder of the Company, as the case may be, has had access to certain Confidential Information (as hereinafter defined), including, without limitation, information concerning the
Company’s business and the relationships between the Company, its Subsidiaries and their customers; 
 WHEREAS, the Undersigned
recognizes that Prosperity Bancshares would not have entered into the Merger Agreement nor consummated the Merger without the Undersigned agreeing to the terms and conditions of this Agreement; 
 WHEREAS, any capitalized term not defined herein shall have the meaning set forth in the Merger Agreement; and 
 NOW, THEREFORE, in consideration of the good and valuable consideration contained in the Merger Agreement, the receipt and sufficiency of which are
hereby acknowledged, the Undersigned hereby agree as follows: 
 1. The Undersigned agrees that he will not, at any time after the Effective
Time of the Merger make any unauthorized disclosure, directly or indirectly, of any Confidential Information of the Company, or third parties, or make any use thereof, directly or indirectly. The Undersigned also agrees that he shall deliver
promptly to Prosperity at any time at its reasonable request, without retaining any copies, all documents and other material in the Undersigned’s possession at that time relating, directly or indirectly, to any Confidential Information or other
information of the Company, or Confidential Information or other information regarding third parties, learned in such person’s position as a director, officer or shareholder of the Company. 

 For purposes of this Agreement, “Confidential Information” means and includes the
Company’s confidential and/or proprietary information and/or trade secrets, including those of its subsidiaries including Southern National Bank of Texas, that have been and/or will be developed or used and that cannot be obtained readily by
third parties from outside sources. Confidential Information includes, but is not limited to, the: information regarding past, current and prospective customers and investors and business affiliates, employees, contractors, and the industry not
generally known to the public; strategies, methods, books, records, and documents; technical information concerning products, equipment, services, and processes; procurement procedures, pricing, and pricing techniques; including contact names,
services provided, pricing, type and amount of services used, financial data; pricing strategies and price curves; positions; plans or strategies for expansion or acquisitions; budgets; research; financial and sales data; trading methodologies and
terms; communications information; evaluations, opinions and interpretations of information and data; marketing and merchandising techniques; electronic databases; models; specifications; computer programs; contracts; bids or proposals; technologies
and methods; training methods and processes; organizational structure; personnel information; payments or rates paid to consultants or other service providers; and other such confidential or proprietary information. The term “Confidential
Information” does not include any information that (i) at the time of disclosure or thereafter is generally available to and known to the public, other than by a breach of this Agreement by the disclosing party, (ii) was available to
the disclosing party on a non-confidential basis from a source other than the non-disclosing party or (iii) was independently acquired or developed without violating any obligations of this Agreement. The Undersigned acknowledges that
Prosperity’s business is highly competitive, that this Confidential Information constitutes a valuable, special and unique asset acquired by Prosperity in the Merger, and that protection of such Confidential Information against unauthorized
disclosure and use is of critical importance to Prosperity. 
 2. The Undersigned agrees that, for the period (the “Non-Competition
Period”) beginning on the Effective Time of the Merger and for three (3) years thereafter, the Undersigned will not, in any capacity, directly or indirectly: 
  

	 	a)	compete or engage, anywhere in the geographic area comprised of the fifty (50) mile radius surrounding any Prosperity banking center, or any other banking center operated or
owned directly or indirectly by Prosperity (the “Market Area”), in a business similar to that of Prosperity as of the date hereof; 

  

	 	b)	take any action to invest in, own, manage, operate, control, participate in, be employed or engaged by or be connected in any manner with any partnership, corporation or other
business or entity engaging in a business similar to that of Prosperity anywhere within the Market Area. Notwithstanding the foregoing, the Undersigned is permitted hereunder to own, directly or indirectly, up to one percent (1%) of the issued
and outstanding securities of any publicly traded financial institution conducting business in the Market Area; 

  

	 	c)	call on, service or solicit competing business from former customers of the Company or its Subsidiaries or customers of Prosperity or its Subsidiaries; or 

 

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	 	d)	call on, solicit or induce any employee of Prosperity whom the Undersigned had contact with, knowledge of, or association with to terminate employment from Prosperity or its
Affiliates, and will not assist any other person or entity in such activities. 

 3. The Undersigned acknowledges that the
restrictions imposed by this Agreement are legitimate, reasonable and necessary to protect Prosperity’s acquisition of the Company and the goodwill thereof. The Undersigned acknowledges that the scope and duration of the restrictions contained
herein are reasonable in light of the time that the Undersigned has been engaged in the business of the Company and the Undersigned’s relationship with the customers of the Company. The Undersigned further acknowledges that the restrictions
contained herein are not burdensome to the Undersigned in light of the consideration paid therefor and the other opportunities that remain open to the Undersigned. Moreover, the Undersigned acknowledges that he has and will have other means
available to him for the pursuit of his livelihood after the effective time of the Merger. 
 4. The Undersigned acknowledges and agrees that
the breach of any of the covenants made by the Undersigned in this Agreement would cause irreparable injury to Prosperity, which could not sufficiently be remedied by monetary damages; and, therefore, that Prosperity shall be entitled to obtain such
equitable relief as declaratory judgments; temporary, preliminary and permanent injunctions, without posting of any bond, and order of specific performance to enforce those covenants or to prohibit any act or omission that constitutes a breach
thereof. If Prosperity must bring suit to enforce this Agreement, the prevailing party shall be entitled to recover its attorneys’ fees and costs related thereto. 
 5. In the event that Prosperity shall file a lawsuit in any court of competent jurisdiction alleging a breach of the non-disclosure or non-competition provisions of this Agreement by the Undersigned, then any time
period set forth in this Agreement including the time periods set forth above, shall be deemed tolled as of the time such lawsuit is filed and shall remain tolled until such dispute finally is resolved either by written settlement agreement
resolving all claims raised in such lawsuit or by entry of a final judgment in such lawsuit and the final resolution of any post-judgment appellate proceedings. 
 6. This Agreement shall be governed by and construed in accordance with the laws of the State of Texas. 
 7.
This Agreement shall not be amended, modified, or altered in any manner except in writing signed by both parties. 
 8. If any provision of
this Agreement is held by a court of competent jurisdiction to be invalid, void, or unenforceable, the remaining provisions shall remain in full force and effect, as if this Agreement has been executed without any such invalid provisions having been
included. Such invalid provision shall be reformed in a manner that is both (i) legal and enforceable, and (ii) most closely represents the parties’ original intent. 
 9. This Agreement shall be binding upon and shall inure to the benefit of Prosperity and its successors and assigns, including, without limitation, any
successor by merger, 

  

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consolidation or stock purchase of Prosperity and any entity or person that acquires all or substantially all of the assets of Prosperity. 
 IN WITNESS WHEREOF, the Undersigned has caused this Agreement to be duly executed as of the date first written above. 
  

	
	UNDERSIGNED
	
	/s/ Harvey Zinn
	Harvey Zinn

  

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