Document:

EX-10.4

 Exhibit 10.4 

ZENDESK, INC. 
 2014
EMPLOYEE STOCK PURCHASE PLAN 
 The purpose of the Zendesk, Inc. 2014 Employee Stock Purchase Plan (the “Plan”) is to provide
eligible employees of Zendesk, Inc. (the “Company”) and each Designated Company (as defined in Section 11) with opportunities to purchase shares of the Company’s common stock, par value $0.01 per share (the “Common
Stock”). 7,250,000 shares of Common Stock in the aggregate have been approved and reserved for this purpose, plus on January 1, 2015 and each January 1 thereafter, the number of shares of Common Stock reserved and available for
issuance under the Plan shall be cumulatively increased by one percent of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31. 

The Plan includes two components: a Code Section 423 Component (the “423 Component”) and a non-Code Section 423 Component
(the “Non-423 Component”). It is intended for the 423 Component to constitute an “employee stock purchase plan” within the meaning of Section 423(b) of the U.S. Internal Revenue Code of 1986, as amended (the
“Code”) and the 423 Component shall be interpreted in accordance with that intent (although the Company makes no undertaking or representation to maintain such qualification). In addition, this Plan authorizes the grant of options under
the Non-423 Component that does not qualify as an “employee stock purchase plan” under Section 423 of the Code because of deviations necessary to permit participation in the Plan by employees who are foreign nationals or employed
outside of the United States while complying with applicable foreign laws. Except as otherwise provided herein, the Non-423 Component will operate and be administered in the same manner as the 423 Component. 

 1. Administration. The Plan will be administered by the Compensation Committee of the
Board of Directors and/or such other person or persons (the “Administrator”) appointed by the Company’s Board of Directors (the “Board”) for such purpose. The Administrator has authority at any time to: (i) adopt, alter
and repeal such rules, guidelines and practices for the administration and operation of the Plan and for its own acts and proceedings as it shall deem advisable, including to accommodate the specific requirements of local laws and procedures for
jurisdictions outside of the United States. (ii) interpret the terms and provisions of the Plan; (iii) make all determinations it deems advisable for the administration of the Plan; (iv) decide all disputes arising in connection with
the Plan; and (v) otherwise supervise the administration of the Plan. All interpretations and decisions of the Administrator shall be binding on all persons, including the Company and the Participants. No member of the Board or individual
exercising administrative authority with respect to the Plan shall be liable for any action or determination made in good faith with respect to the Plan or any option granted hereunder. 

2. Offerings. The Company will make one or more offerings to eligible employees to purchase Common Stock under the Plan
(“Offerings”) consisting of one or more Purchase Periods. Unless otherwise determined by the Administrator, the initial Offering will begin on the Registration Date and will end on the date that is eighteen months following the
Registration Date (“the Initial Offering”). Unless otherwise determined by the Administrator, subsequent Offerings will be eighteen months long and begin every six months on dates determined by the Administrator. The Administrator may, in
its discretion, designate a different period for any Offering, provided that no Offering shall exceed 27 months in duration. Unless the Administrator otherwise determines, each Offering will be divided into three equal Purchase Periods. 

  
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 3. Eligibility. All individuals classified as employees on the payroll records of the
Company and each Designated Company are eligible to participate in any one or more of the Offerings under the Plan, provided that as of the first day of the applicable Offering (the “Offering Date”) they have completed at least 30 days of
employment, unless the exclusion of employees who do not meet this requirement is not permissible under applicable law. Notwithstanding any other provision herein, individuals who are not contemporaneously classified as employees of the Company or a
Designated Company for purposes of the Company’s or applicable Designated Company’s payroll system are not considered to be eligible employees of the Company or any Designated Company and shall not be eligible to participate in the Plan.
In the event any such individuals are reclassified as employees of the Company or a Designated Company for any purpose, including, without limitation, common law or statutory employees, by any action of any third party, including, without
limitation, any government agency, or as a result of any private lawsuit, action or administrative proceeding, such individuals shall, notwithstanding such reclassification, remain ineligible for participation. Notwithstanding the foregoing, the
exclusive means for individuals who are not contemporaneously classified as employees of the Company or a Designated Company on the Company’s or Designated Company’s payroll system to become eligible to participate in this Plan is through
an amendment to this Plan, duly executed by the Company, which specifically renders such individuals eligible to participate herein. 
 4.
Participation. 
 (a) Participants on Effective Date. Each eligible employee as of the Registration Date shall be deemed to be
a Participant at such time. If an eligible employee is deemed to be a Participant pursuant to this Section 4(a), such individual shall be deemed not to 

  
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have authorized payroll deductions or other contributions and shall not purchase any Common Stock hereunder unless he or she thereafter authorizes payroll deductions or other contributions by
submitting an enrollment form (in the manner described in Section 4(c)) within 90 days after the commencement of the Initial Offering. If such a Participant does not authorize payroll deductions or other contributions by submitting an
enrollment form by such deadline (or such other deadline as determined by the Administrator), that Participant will be deemed to have withdrawn from the Plan. 

(b) Participants in Subsequent Offerings. An eligible employee who is not a Participant on any Offering Date may participate in such
Offering by submitting an enrollment form in a manner determined by the Company at least 15 business days before the Offering Date (or by such other deadline as shall be established by the Administrator for the Offering). 

(c) Enrollment. The enrollment form will (a) state a whole percentage (unless the Administrator determines in advance of an
Offering to require that a fixed amount be specified in lieu of a percentage) to be contributed from an eligible employee’s Compensation (as defined in Section 11) per pay period, (b) authorize the purchase of Common Stock in each
Offering in accordance with the terms of the Plan and (c) specify the exact name or names in which shares of Common Stock purchased for such individual are to be issued pursuant to Section 10. An employee who does not enroll in accordance
with these procedures will be deemed to have waived the right to participate. Unless a Participant files a new enrollment form or withdraws from the Plan, such Participant’s contributions and purchases will continue at the same percentage of
Compensation for future Offerings, provided he or she remains eligible. 
 (d) Notwithstanding the foregoing, participation in the Plan will
neither be permitted nor be denied contrary to the requirements of the Code and any applicable law. 

  
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 5. Employee Contributions. Each eligible employee may authorize payroll deductions at a
minimum of 1 percent up to a maximum of 15 percent of such employee’s Compensation for each pay period; provided, however, that if payroll deductions are not permitted or problematic under applicable law or for administrative reasons,
the Company, in its discretion, may allow eligible employees to contribute to the Plan by other means. The Company will maintain book accounts showing the amount of payroll deductions or other contributions made by each Participant for each Purchase
Period. No interest will accrue or be paid on payroll deductions or other contributions, unless required under applicable law. 
 6.
Contribution Changes. Except in the event of a Participant increasing his or her contributions from 0 percent during the Initial Offering as specified in Section 4(a) or as may be determined by the Administrator in advance of an
Offering, a Participant may not increase or decrease his or her contributions during any Offering, but may increase or decrease his or her contributions with respect to the next Offering (subject to the limitations of Section 5) by filing a new
enrollment form at least 15 business days before the next Offering Date (or by such other deadline as shall be established by the Administrator for the Offering). The Administrator may, in advance of any Offering, establish rules permitting a
Participant to increase, decrease or terminate his or her contributions during an Offering. 
 7. Withdrawal. A Participant may
withdraw from participation in the Plan by delivering a written notice of withdrawal in a manner determined by the Administrator. The Participant’s withdrawal will be effective as of the next business day. Following a Participant’s
withdrawal, the Company will promptly refund such individual’s entire account balance under the Plan to him or her (after payment for any Common Stock purchased before the effective date of withdrawal). Partial withdrawals are not permitted.
Such an employee may not begin participation again during the remainder of the Offering, but may enroll in a subsequent Offering in accordance with Section 4. 

  
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 8. Grant of Options. On each Offering Date, the Company will grant to each eligible
employee who is then a Participant in the Plan an option (“Option”) to purchase on the last day of a Purchase Period (an “Exercise Date”), at the Option Price hereinafter provided for, the lowest of (a) a number of shares of
Common Stock determined by dividing such Participant’s accumulated contributions on such Exercise Date by the lower of (i) 85 percent of the Fair Market Value of the Common Stock on the Offering Date, or (ii) 85 percent of the Fair
Market Value of the Common Stock on the Exercise Date, (b) 3,000 shares; or (c) such other lesser maximum number of shares as shall have been established by the Administrator in advance of the Offering; provided, however, that such Option
shall be subject to the limitations set forth in the Plan. Each Participant’s Option shall be exercisable only to the extent of such Participant’s accumulated payroll deductions on the Exercise Date. The purchase price for each share
purchased under each Option (the “Option Price”) will be 85 percent of the Fair Market Value of the Common Stock on the Offering Date or the Exercise Date, whichever is less. 

Notwithstanding the foregoing, no Participant may be granted an option hereunder if such Participant, immediately after the option was
granted, would be treated as owning stock possessing 5 percent or more of the total combined voting power or value of all classes of stock of the Company or any Parent or Subsidiary (as defined in Section 11). For purposes of the preceding
sentence, the attribution rules of Section 424(d) of the Code shall apply in determining the stock ownership of a Participant, and all stock which the Participant has a contractual right to purchase shall be treated as stock owned by the
Participant. In addition, no Participant may be granted an Option which permits his or her rights to purchase stock under the Plan, and any other 

  
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employee stock purchase plan of the Company and its Parents and Subsidiaries, to accrue at a rate which exceeds $25,000 of the fair market value of such stock (determined on the option grant date
or dates) for each calendar year in which the Option is outstanding at any time. The purpose of the limitation in the preceding sentence is to comply with Section 423(b)(8) of the Code and shall be applied taking Options into account in the
order in which they were granted. 
 9. Exercise of Option and Purchase of Shares. Each employee who continues to be a Participant in
the Plan on an Exercise Date shall be deemed to have exercised his or her Option on such date and shall acquire from the Company such number of whole shares of Common Stock reserved for the purpose of the Plan as his or her accumulated contributions
on such date will purchase at the Option Price, subject to any other limitations contained in the Plan; provided that, with respect to the Initial Offering, the exercise of each Option shall be conditioned on the closing of the Company’s
Initial Public Offering on or before the first Exercise Date. Any amount remaining in a Participant’s account after the purchase of shares on an Exercise Date of an Offering solely by reason of the inability to purchase a fractional share will
be carried forward to the next Purchase Period and, if such Exercise Date is the final Exercise Date of an Offering, will be carried forward to the next Offering; any other balance remaining in a Participant’s account at the end of an Offering
will be refunded to the Participant promptly. 
 If a Participant has more than one Option outstanding under the Plan, unless he or she
otherwise indicates in agreements or notices delivered hereunder: (i) each agreement or notice delivered by that Participant shall be deemed to apply to all of his or her Options under the Plan, and (ii) an Option with a lower Option Price
(or an earlier granted Option, if different Options have identical Option Prices) shall be exercised to the fullest possible extent before an Option with a higher Option Price (or a later granted Option if different Options have identical Option
Prices) shall be exercised. 

  
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 10. Issuance of Certificates. Certificates, or book entries for uncertificated shares,
representing shares of Common Stock purchased under the Plan may be issued only in the name of the employee or, if permitted by the Administrator, in the name of the employee and another person of legal age as joint tenants with rights of
survivorship, or in the name of a broker authorized by the employee to be his, her or their, nominee for such purpose. 
 11.
Definitions. The term “Affiliate” means any entity that is directly or indirectly controlled by the Company which does not meet the definition of a Subsidiary below, as determined by the Administrator, whether
now or hereafter existing. 
 The term “Compensation” means the amount of total cash compensation, prior to salary reduction
pursuant to Sections 125, 132(f) or 401(k) of the Code, including base pay, overtime, commissions, and incentive or bonus awards, but excluding allowances and reimbursements for expenses such as relocation allowances or travel expenses, income
or gains on the exercise of Company stock options, and similar items. The Administrator shall have the discretion to determine the application of this definition to Participants outside the United States. 

The term “Designated Company” means any present or future Affiliate or Subsidiary (as defined below) that has been designated by the
Board to participate in the Plan. The Board may so designate any Affiliate or Subsidiary, or revoke any such designation, at any time and from time to time, either before or after the Plan is approved by the stockholders and may further designate
such companies as participating in the 423 Component or the Non-423 Component. For purposes of the 423 Component, only Subsidiaries may be Designated Companies. 

  
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 The term “Fair Market Value of the Common Stock” on any given date means the fair
market value of the Common Stock determined in good faith by the Administrator; provided, however, that if the Common Stock is admitted to quotation on the National Association of Securities Dealers Automated Quotation System
(“NASDAQ”), NASDAQ Global Market or another national securities exchange, the determination shall be made by reference to the closing price on such date. If there is no closing price for such date, the determination shall be made by
reference to the last date preceding such date for which there is a closing price. Notwithstanding the foregoing, if the date for which Fair Market Value of the Common Stock is determined is the first day when trading prices for the Common Stock are
reported on NASDAQ or another national securities exchange, the Fair Market Value of the Common Stock shall be the “Price to the Public” (or equivalent) set forth on the cover page for the final prospectus relating to the Company’s
Initial Public Offering. 
 The term “Initial Public Offering” means the the first offer and sale by the Company of its Common
Stock in an underwritten, firm-commitment public offering. 
 The term “Parent” means a “parent corporation” with
respect to the Company, as defined in Section 424(e) of the Code. 
 The term “Participant” means an individual who is
eligible as determined in Section 3 and who has complied with the provisions of Section 4. 
 The term “Purchase Period”
means a period of time specified within an Offering beginning on the Offering Date or on the next day following an Exercise Date within an Offering and ending on an Exercise Date. An Offering may consist of one or more Purchase Periods. 

  
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 The term “Registration Date” means the date the registration statement on Form S-1 that
is filed by the Company with respect to the Initial Public Offering is declared effective by the Securities and Exchange Commission. 
 The
term “Subsidiary” means a “subsidiary corporation” with respect to the Company, as defined in Section 424(f) of the Code. 

12. Rights on Termination of Employment. Unless otherwise required by applicable law, if a Participant’s employment terminates for
any reason before the Exercise Date for any Offering, no contributions will be taken from any pay due and owing to the Participant and the balance in the Participant’s account will be paid to such Participant or, in the case of such
Participant’s death, if permitted by the Administrator, to his or her designated beneficiary as if such Participant had withdrawn from the Plan under Section 7. An employee will be deemed to have terminated employment, for this purpose, if
the corporation that employs him or her, having been a Designated Company, ceases to be an Affiliate or Subsidiary, as applicable, or if the employee is transferred to any corporation other than the Company or a Designated Company. An employee will
not be deemed to have terminated employment for this purpose, if the employee is on an approved leave of absence for military service or sickness or for any other purpose approved by the Company, if the employee’s right to reemployment is
guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was granted or if the Administrator otherwise provides in writing. 

13. Optionees Not Stockholders. Neither the granting of an Option to a Participant nor the deductions from his or her pay or other
contributions shall deem such Participant to be a holder of the shares of Common Stock covered by an Option under the Plan until such shares have been purchased by and issued to him or her. 

  
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 14. Rights Not Transferable. Rights under the Plan are not transferable by a Participant
other than by will or the laws of descent and distribution, and are exercisable during the Participant’s lifetime only by the Participant. 

15. Application of Funds. All funds received or held by the Company under the Plan may be combined with other corporate funds and may
be used for any corporate purpose, unless otherwise required under applicable law. 
 16. Adjustment in Case of Changes Affecting Common
Stock. In the event of a subdivision of outstanding shares of Common Stock, the payment of a dividend in Common Stock or any other change affecting the Common Stock, the number of shares approved for the Plan and the share limitation set forth
in Section 8 shall be equitably or proportionately adjusted to give proper effect to such event. 
 17. Amendment of the Plan.
The Board may at any time and from time to time amend the Plan in any respect, except that without the approval within 12 months of such Board action by the stockholders, no amendment shall be made increasing the number of shares approved for the
Plan or making any other change that would require stockholder approval in order for the 423 Component of the Plan, as amended, to qualify as an “employee stock purchase plan” under Section 423(b) of the Code. 

18. Insufficient Shares. If the total number of shares of Common Stock that would otherwise be purchased on any Exercise Date plus the
number of shares purchased under previous Offerings under the Plan exceeds the maximum number of shares issuable under the Plan, the shares then available shall be apportioned among Participants in proportion to the amount of payroll deductions
accumulated on behalf of each Participant that would otherwise be used to purchase Common Stock on such Exercise Date. 

  
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 19. Termination of the Plan. The Plan may be terminated at any time by the Board. Upon
termination of the Plan, all amounts in the accounts of Participants shall be promptly refunded. The Plan shall automatically terminate on the ten year anniversary of the Registration Date. 

20. Governmental Regulations. The Company’s obligation to sell and deliver Common Stock under the Plan is subject to obtaining all
governmental approvals required in connection with the authorization, issuance, or sale of such stock. 
 21. Governing Law. This
Plan and all Options and actions taken thereunder shall be governed by, and construed in accordance with, the laws of the State of Delaware, applied without regard to conflict of law principles. 

22. Issuance of Shares. Shares may be issued upon exercise of an Option from authorized but unissued Common Stock, from shares held in
the treasury of the Company, or from any other proper source. 
 23. Tax Withholding. Participation in the Plan is subject to any
minimum required tax withholding on income of the Participant in connection with the Plan. Each Participant agrees, by entering the Plan, that the Company and its Affiliates and Subsidiaries shall have the right to deduct any such taxes from any
payment of any kind otherwise due to the Participant, including shares issuable under the Plan. 
 24. Notification Upon Sale of
Shares. Each Participant who is subject to tax in the United States with respect to his or her participation in the Plan agrees, by entering the Plan, to give the Company prompt notice of any disposition of shares purchased under the Plan where
such disposition occurs within two years after the date of grant of the Option pursuant to which such shares were purchased. 

  
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 25. Effective Date and Approval of Shareholders. The Plan shall take effect on the
Registration Date, subject to approval by the holders of a majority of the votes cast at a meeting of stockholders at which a quorum is present or by written consent of the stockholders. 

  
 13EX-10.5

 Exhibit 10.5 

October 28, 2011 
 Alan Black 

Delivered by email to  
 Dear Alan: 

On behalf of Zendesk, Inc. (the “Company”), I am pleased to offer employment to you. The purpose of this letter is to outline the
terms for your employment. 
 Position: Your initial position with the Company will be Chief Financial Officer (CFO). This is a
regular full-time exempt position. 
 Start Date: Unless we arrange separately, your first day of employment will be
November 14, 2011. You will report to CEO Mikkel Svane. 
 Salary: The Company will pay you an annual salary of
$240,000.00, paid semi-monthly, and subject to periodic review and adjustment at the discretion of the Company. Additionally, you will be eligible to earn $60,000.00 per year under your incentive compensation plan to be delivered under separate
cover. Your salary and other compensation will be subject to applicable deductions and withholdings. 
 Stock Options: You
will be eligible to participate in the Company’s stock option program, subject to approval by the Board of Directors. We will recommend to the Board of Directors that you be granted an option to purchase 750,000 shares of the Company’s
common stock at the stock’s then fair market value. Your eligibility for stock options will be governed by the 2009 Stock Option and Grant Plan and any associated stock option agreement required to be entered into by you and the Company.

 Stock Option Vesting: Your stock options will vest over a five-year vesting schedule. The first 25% shall vest on your first
anniversary with the Company, subject to acceleration provisions provided below. The remaining 75% shall vest ratably over the remaining 48 months. In the event of a Sale Event, as described by the Plan, all unvested options will accelerate and
become vested. 
 Benefits: You will be eligible to participate in the employee benefits and insurance programs generally made
available to employees, including health, life, disability and dental insurance, subject to the terms and conditions of those plans and programs which may be modified from time to time. Details of these benefits programs, including mandatory
employee contributions, will be made available to you when you start. You also will be eligible to receive paid vacation time. You will be eligible for up to fifteen (15) days of paid vacation per year, which shall accrue on a prorated basis.
Other provisions of the Company’s vacation policy are set forth in the policy itself. 
 ZENDESK, INC. - 989 MARKET ST - SAN
FRANCISCO, CA 94103 

 Representation Regarding Other Obligations: This offer is conditioned on your
representation that you are not subject to any confidentiality, non-competition agreement or any other similar type of restriction that may affect your ability to devote full time and attention to your work at Zendesk. If you have entered into any
agreement that may restrict your activities on behalf of the Company, please provide me with a copy of the agreement as soon as possible. 

Other Terms: Your employment with the Company shall be on an at-will basis. In other words, you or the Company may terminate employment
for any reason and at any time, with or without notice. Similarly, the terms of employment outlined in this letter are subject to change at any time provided that the at-will nature of your employment may not be altered except by a formal writing
signed by the Company’s Chief Executive Officer. You also will be required to sign the Company’s standard Confidentiality and Assignment Agreement (“Employee Agreement”) as a condition of your employment. This offer letter and
the Employee Agreement shall be governed by California law. A copy of that Agreement is enclosed. In addition, as with all employees, our offer to you is contingent on your submission of satisfactory proof of your identity and your legal
authorization to work in the United States. 
 We are excited about the opportunity to work with you at Zendesk, Inc. If you have any
questions about this information, please do not hesitate to call. Otherwise, please confirm your acceptance of this offer of employment by Monday October 31st by signing below and returning a copy, preferably by scanning and emailing to
mikkel@zendesk.com. We are confident that with your background and skills, you will have an immediate positive impact on our organization. 
  

							
	 Very truly yours
  

/s/ Mikkel Svane
 Mikkel Svane

 
 Chief Executive Officer
	 		 	
				
	 /s/ Alan Black
	 		 		 	  

	Employee’s Signature	 		 		 	Date

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