Sec Form 4 Filing - Stalder Dana @ Zendesk, Inc. - 2015-05-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Stalder Dana 2. Issuer Name and Ticker or Trading Symbol Zendesk, Inc. [ ZEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 260 HOMER AVENUE, SUITE 201 3. Date of Earliest Transaction (MM/DD/YY) 05/13/2015 (Street) PALO ALTO, CA94301 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/13/2015 S 15,000 D $ 22.6674 ( 1 ) 50,054 I By Vista Grande Trust Dated January 24, 2001 as amended ( 2 ) Common Stock 3,464,937 I By Matrix Partners IX, L.P. ( 3 ) Common Stock 5,954 I By Weston & Co. IX LLC, As Nominee ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Stalder Dana 260 HOMER AVENUE SUITE 201 PALO ALTO, CA94301 X Signatures /s/ Dana Stalder 05/14/2015 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This sale price represents the weighted average sale price of the shares sold ranging from $22.60 to $22.77 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person willprovide full information regarding the number of shares sold at each separate price. ( 2 )Shares held by Vista Grande Trust dated January 24, 2001 as amended. The Reporting Person is a trustee and beneficiary of the trust. ( 3 )These shares are owned directly by Matrix Partners IX, L.P. ("Matrix IX"). Dana Stalder is managing member of Matrix IX Management Co., L.L.C., the general partner of Matrix IX, and has sole voting and dispositive power with respect to the Matrix IX shares. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for Section 16 or any other purpose. Dana Stalder is a director of Issuer. ( 4 )These shares are owned directly by Weston & Co. IX LLC ("Weston IX"), as nominee for Vista Grande Trust, a trust of which Mr. Stalder is the trustee and a beneficiary (the "Trust"). Weston IX also directly owns other shares in the company as nominee for other beneficial owners. Mr. Stalder disclaims ownership of any of the shares owned directly by Weston IX other than those held by Weston IX as nominee for the Trust. The Trust has sole voting and/or investment control over the shares held by Weston IX as nominee for the Trust, but does not have sole or shared voting and/or investment control with respect to the other shares owned by Weston IX.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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