Document:

EX-10.12

 Exhibit 10.12 

October 18, 2010 
 Amit Sinha 

Dear Amit: 
 Zscaler (the “Company”) is pleased to
offer you employment on the following terms: 
  

	 	1.	Position: The Company will employ you full-time as its Chief Technology Officer (Emerging technologies & Cloud Operations) reporting to me and working out of the Company’s office in Sunnyvale, CA.
By signing this letter agreement, you confirm to the Company that you have no contractual commitments or other legal obligations that would prohibit you from performing your duties for the Company or materially impair your ability to perform those
duties. 

  

	 	2.	Base Salary and Incentive Compensation: The Company will pay you a base salary at the rate of $16,666.67 per month ($200,000 annualized “Base Salary”), paid in accordance with normal payroll
policies of the Company. In addition, you are eligible to receive an annual target commission of $40,000 (20% of base salary) per the Company’s annual bonus plan. 

 

	 	3.	Employee Benefits: As a regular employee of the Company, you will be eligible to participate in the Company’s standard employee benefit package (medical, dental insurance, etc.) as of your Start Date
according to the terms of each respective benefit plan. Further information regarding these plans will be sent to you prior to or shortly after your Start Date. 

  

	 	4.	Incentive Stock Compensation: Upon joining the Company, it will be recommended to the Company’s Board of Directors that you be granted an option to purchase shares of common stock of the Company as described
below: 

  

	 	•	 	The Company will recommend at the first meeting of the Company’s Board of Directors after your Start Date that the Company grant you an early exercise nonqualified stock option to purchase 825,000 shares of the
Company’s Common Stock (the “Option”) which represents your total ownership percentage of 1.25% at a price per share equal to the fair market value per share of the Common Stock on the date of grant, as determined by the
Company’s Board of Directors. 

  

	 	•	 	The Option will be subject to the terms and conditions of your early exercise Stock Option Agreement and the Company’s 2008 Stock Plan (the “Stock Plan”), including vesting requirements; provided,
however, the Stock Option Agreement will include provisions allowing you to exercise your Option early, whereby you will have the opportunity (but not the obligation) to exercise the Option as to unvested shares. Further, any shares you acquire upon
the early exercise of the Option will be subject to a Company repurchase right at the original exercise price upon your termination of service at any time and for any reason. The Company’s repurchase right will lapse in accordance with the same
vesting schedule applicable to the Option. 

  

	 	5.	Vesting Schedule: Subject to your continued employment with the Company, 25% of the shares subject to the Option shall vest on the one year anniversary of your Start Date, and 1/48th of the shares subject
to the Option shall vest on the corresponding day of each month thereafter (or if there is no corresponding day in any such month, on the last day of such month), until all shares have vested on the
4th anniversary date of your Start Date. 

	 	6.	Change of Control: In case of an IPO or Change of Control, sale or merger or sale of substantially all the assets of the Company, 50% of your outstanding restricted shares that have not yet been released
under the repurchase option, will be released immediately. 

  

	 	7.	Confidential Information & Invention Assignment Agreement: Like all Company employees, you will be required, as a condition to your employment with the Company, to sign the Company’s standard
Confidential Information and Invention Assignment Agreement prior to or on your start date. 

  

	 	8.	Employment Relationship: Employment with the Company is for no specific period of time. Your employment with the Company will be “at will”, meaning that either you or the Company may terminate
your employment at any time and for any reason, with or without cause. Although your job duties, title, compensation and benefits, as well as the Company’s personnel policies and procedures, may change from time to time, the “at will”
nature of your employment may only be changed in an express written agreement signed by you and the CEO of the Company. 

  

	 	9.	Outside Activities: While you render services to the Company, you will not assist any person or entity in competing with the Company, in preparing to compete with the Company or in hiring any employees or
consultants of the Company. 

  

	 	10.	Withholding Taxes: All forms of compensation referred to in this letter agreement are subject to reduction to reflect applicable withholding and payroll taxes and other deductions required by law.

  

	 	11.	Entire Agreement: This letter agreement supersedes and replaces any prior understandings or agreements, whether oral or written, between you and the Company regarding the subject matter described in this
letter agreement. 

 You may indicate your agreement with these terms and accept this offer by signing and dating the letter agreement and the
enclosed Confidential Information and Invention Assignment Agreement and returning them to me (fax number 678-815-1155). This offer, if not accepted, will expire at the close of business on October 25, 2010. As required by law, your employment
with the Company is contingent upon your providing legal proof of your identity and authorization to work in the United States. 
 Sincerely, 

/s/ Jay Chaudhry 
 Jay Chaudhry 

CEO 
  

					
	I have read and accept this employment offer:	  	/s/ Amit Sinha	  	

  

							
		 	Signature — Amit Sinha	  	Start Date December 1, 2010EX-10.13

 Exhibit 10.13 

November 25, 2014 
 William E. Welch 

Dear William: 
 Zscaler (the “Company”) is pleased to
offer you employment on the following terms: 
  

	 	1.	Position: The Company will employ you as its Global Vice-President of Sales reporting to Lane Bess and working out of your home office in Raleigh, NC. By signing this letter agreement, you confirm to the Company
that you have no contractual commitments or other legal obligations that would prohibit you from performing your duties for the Company or materially impair your ability to perform those duties. 

Base Salary and Incentive Compensation: The Company will pay you a base salary at the rate of $20,833 per month ($250,000 annualized
“Base Salary”), paid in accordance with normal payroll policies of the Company. In addition, you are eligible to receive an annual commission plan of $250,000 that will be pro-rated based on your
date of hire. The terms of your FY15 Commission Plan will be provided to you within the first 30 days of your employment and will include a guarantee of $20,835 per month of employment (pro-rated from your start date) through July 31, 2015.

  

	 	2.	Employee Benefits: As a regular employee of the Company, you will be eligible to participate in the Company’s standard employee benefit package (medical, dental insurance, etc.) as of your Start Date (set
forth below) according to the terms of each respective benefit plan. Further information regarding these plans will be sent to you prior to or shortly after your Start Date. 

 

	 	3.	Incentive Stock Compensation: Upon joining the Company, it will be recommended to the Company’s Board of Directors that you be granted an option to purchase shares of common stock of the Company as described
below: 

  

	 	•	 	An early exercisable nonqualified stock option to purchase 650,000 (six hundred-fifty thousand) shares of the Company’s Common Stock (the “Option”) at a price per share equal to the fair market value per
share of the Common Stock on the date of grant, as determined by the Company’s Board of Directors. 

  

	 	•	 	The Option will be subject to the terms and conditions of your early exercise Stock Option Agreement and the Company’s 2007 Stock Plan (the “Stock Plan”), including vesting requirements; provided,
however, the Stock Option Agreement will include provisions allowing you to exercise your Option early, whereby you will have the opportunity (but not the obligation) to exercise the Option as to unvested shares. Further, any shares you acquire upon
the early exercise of the Option will be subject to a Company repurchase right at the original exercise price upon your termination of service at any time and for any reason. The Company’s repurchase right will lapse in accordance with the same
vesting schedule applicable to the Option. 

  

	 	4.	Vesting Schedule: Subject to your continued employment with the Company, 25% of the shares subject to the Option shall vest on the one year anniversary of your Start Date, and 1/48th of the shares subject to the
Option shall vest on the corresponding day of each month thereafter (or if there is no corresponding day in any such month, on the last day of such month), until all shares have vested on the 4th
anniversary date of your Start Date. 

  

	 	5.	Severance:: In the event that the Company terminates your employment other than for Cause, then, subject to Section 7 below and subject to your execution and compliance with a twelve month (12) month
non-compete/non-solicit agreement in favor of the Company, you will be entitled to receive severance pay at a rate equal to one hundred percent (100%) of your Base Salary, as then in effect (less applicable withholding), for a period of twelve
(12) months from the date of such termination. If the termination without Cause occurs before a Change of Control or more than 12 months after a Change of Control, the severance pay shall be paid periodically in accordance with the
Company’s normal payroll practices and shall terminate on the earlier of (i) twelve (12) months from the date of your termination without Cause, and (ii) the date that you are engaged, directly or indirectly, as an employee,
consultant or advisor to any person or entity. If the termination without Cause occurs within 12 months after a Change of Control, the severance pay shall be payable in a lump sum (less applicable withholding) within 10 days of the termination date.

  

	 	6.	Vesting Acceleration: If your employment is terminated within 12 months following a Change of Control other than for Cause, then, in addition to the severance pay provided for in Section 5 and subject to
Section 7 below, you will be entitled to receive acceleration of vesting under the Option. The number of shares that will accelerate and vest under the Option pursuant to this Section 6 will be equal to the lesser of (i) 220,000
shares, and (ii) the total number of unvested shares under the options granted in Section 3 as of your termination date. 

 “Change of Control” Definition. For purposes of this Agreement, a “Change
of Control” means either: 
 (1) the acquisition of the Company by another entity by means of any transaction or series of related
transactions (including, without limitation, any reorganization, merger or consolidation or stock transfer, but excluding any such transaction effected primarily for the purpose of changing the domicile of the Company), unless the Company’s
stockholders of record immediately prior to such transaction or series of related transactions hold, immediately after such transaction or series of related transactions, at least 50% of the voting power of the surviving or acquiring entity
(provided that the sale by the Company of its securities for the purposes of raising additional funds shall not constitute a Change of Control hereunder); or(2) a sale of all or substantially all of the assets of the Company. Notwithstanding the
foregoing provisions of this definition, a transaction will not be deemed a Change of Control unless the transaction qualifies as a “change in control event” within the meaning of Section 409A of the Internal Revenue Code of 1986, as
amended, and any guidance or regulations promulgated thereunder. 
 “Cause” means (a) your engaging in any act of
dishonesty, fraud or misrepresentation; (b) your violation of any federal or state law or regulation applicable to the Company’s business; (c) your breach of any confidentiality agreement or invention assignment agreement between
yourself and the Company; (d) your being convicted of, or entering a plea of nolo contendere to, any felony crime or committing any act of moral turpitude, or (e) your failure to satisfactorily perform your duties after having
received written notice of such failure and at least fifteen (15) days to cure such failure. 
  

	 	7.	Release. The payment of severance and other benefits set forth in Sections 5 and 6 above are contingent upon your executing and not revoking the Company’s form of Separation Agreement and Release (the
“Release Agreement”), which must become effective and irrevocable no later than the sixtieth (60th) day following your actual termination date (the “Release Deadline”). If the Release Agreement does not become effective and
irrevocable by the Release Deadline, you will forfeit any right to severance payments or benefits under this agreement. In no event will severance payments or benefits be paid or provided until the Release Agreement actually becomes effective and
irrevocable. Any severance payments that would have been made to you prior to the Release Agreement becoming effective and irrevocable will be paid to you no later than the first Company payroll date on or following the Release Deadline and the
remaining payments will be made as provided in this agreement. 

  

	 	8.	Confidential Information & Invention Assignment Agreement: Like all Company employees, you will be required, as a condition to your employment with the Company, to sign the Company’s standard
Confidential Information and Invention Assignment Agreement prior to or on your start date. 

  

	 	9.	Employment Relationship: Employment with the Company is for no specific period of time. Your employment with the Company will be “at will”, meaning that either you or the Company may terminate
your employment at any time and for any reason, with or without cause. Your job duties, title, compensation and benefits, as well as the Company’s personnel policies and procedures, are subject to change by the Company. The “at will”
nature of your employment may only be changed in an express written agreement signed by you and the CEO of the Company. 

  

	 	10.	Outside Activities: While you render services to the Company, you will not assist any person or entity in competing with the Company, in preparing to compete with the Company or in hiring any employees or
consultants of the Company. 

  

	 	11.	Withholding Taxes: All forms of compensation referred to in this letter agreement are subject to reduction to reflect applicable withholding and payroll taxes and other deductions required by law.

  

	 	12.	Limitation on Payments. In the event that the severance benefits provided for in this agreement or otherwise payable to you (i) constitute “parachute payments” within the meaning of
Section 280G of the Internal Revenue Code, as amended (the “Code”) and (ii) but for this Section 13, would be subject to the excise tax imposed by Section 4999 of the Code, then your severance benefits under
Sections 5 and 6 will be delivered to such lesser extent as would result in no portion of such severance benefits constituting “parachute payments” within the meaning of Section 280G or being subject to excise tax under
Section 4999 of the Code, 

  

	 	13.	Clarifications: In the event of a separation, (1) Zscaler agrees to make the indemnification (In paragraph 18 of the separation agreement) bilateral, and (2) you may list your Sales Methodology, Control
Book and other products related to your sales process in Exhibit A of the Inventions Agreement. 

	 	14.	Entire Agreement: This letter agreement supersedes and replaces any prior understandings or agreements, whether oral or written, between you and the Company regarding the subject matter described in this letter
agreement. 

 You may indicate your agreement with these terms and accept this offer by signing and dating the letter agreement and the
enclosed Confidential Information and Invention Assignment Agreement and emailing them to me. This offer, if not accepted, will expire at the close of business on November 30, 2014. This offer is also contingent upon satisfactory check of your
references. As required by law, your employment with the Company is contingent upon your providing legal proof of your identity and authorization to work in the United States. 

Sincerely, 
 /s/ Jay Chaudhry 

Jay Chaudhry 
 CEO & Chairman 

 

					
	I have read and accept this employment offer:  	  	/s/ William Welch	  	
		  	William Welch	  	

 Start Date; December 1, 2014

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