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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Geschke John   2. Issuer Name and Ticker or Trading Symbol Zendesk, Inc. [ZEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) CLO and SVP Administration (Last) (First) (Middle) 1019 MARKET STREET 3. Date of Earliest Transaction (Month/Day/Year) 04/15/2018 (Street) SAN FRANCISCO, CA 94103 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 04/15/2018   M   235 A (1) 13,850 D   Common Stock 04/15/2018   F   82 (2) D $ 48.85 13,768 D   Common Stock 04/15/2018   M   196 A (1) 13,964 D   Common Stock 04/15/2018   F   68 (2) D $ 48.85 13,896 D   Common Stock 04/15/2018   M   200 A (1) 14,096 D   Common Stock 04/15/2018   F   70 (2) D $ 48.85 14,026 D   Common Stock 04/15/2018   M   386 A (1) 14,412 D   Common Stock 04/15/2018   F   134 (2) D $ 48.85 14,278 D   Common Stock 04/15/2018   M   75 A (1) 14,353 D   Common Stock 04/15/2018   F   26 (2) D $ 48.85 14,327 D   Common Stock 04/16/2018   M(3)   3,000 A $ 9.52 17,327 D   Common Stock 04/16/2018   M(3)   2,000 A $ 6.24 19,327 D   Common Stock 04/16/2018   S(3)   4,980 D $ 48.7332 (4) 14,347 D   Common Stock 04/16/2018   S(3)   20 D $ 49.3301 14,327 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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
Restricted Stock Unit	(1)	04/15/2018		M			235	(5)	02/05/2022	Common Stock	235	$ 0	2,355	D
Restricted Stock Unit	(1)	04/15/2018		M			196	(6)	05/06/2023	Common Stock	196	$ 0	4,896	D
Restricted Stock Unit	(1)	04/15/2018		M			200	(7)	05/09/2024	Common Stock	200	$ 0	7,401	D
Restricted Stock Unit	(1)	04/15/2018		M			386	(8)	02/08/2025	Common Stock	386	$ 0	17,344	D
Restricted Stock Unit	(1)	04/15/2018		M			75	(9)	02/08/2025	Common Stock	75	$ 0	676	D
Stock Option (Right to Buy)	$ 6.24	04/16/2018		M(3)			2,000	(10)	05/03/2023	Common Stock	2,000	$ 0	4,666	D
Stock Option (Right to Buy)	$ 9.52	04/16/2018		M(3)			3,000	(11)	02/13/2024	Common Stock	3,000	$ 0	72,000	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Geschke John 1019 MARKET STREET SAN FRANCISCO, CA 94103			CLO and SVP Administration

Signatures

/s/ Hasani Caraway, Attorney-in-Fact for John Geschke		04/16/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Restricted stock units convert into common stock on a one-for-one basis.
(2)	Represents the number of shares withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of the restricted stock units listed in Table II. Such withholding is mandated by an election of the Issuer made in advance and does not represent a discretionary trade by the Reporting Person.
(3)	This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by John Geschke on December 15, 2017.
(4)	This sale price represents the weighted average sale price of the shares sold ranging from $48.30 to $49.28 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
(5)	1/48th of the shares issuable pursuant to the restricted stock units shall vest monthly after the vesting commencement date of February 15, 2015, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(6)	1/48th of the shares issuable pursuant to the restricted stock units shall vest each month after the vesting commencement date of May 15, 2016, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(7)	1/48th of the shares issuable pursuant to the restricted stock units shall vest each month after the vesting commencement date of May 15, 2017, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(8)	1/48th of the shares issuable pursuant to the restricted stock units shall vest each month after the vesting commencement date of January 15, 2018, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(9)	1/12th of the shares issuable pursuant to the restricted stock units shall vest each month after the vesting commencement date of January 15, 2018, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(10)	The option is early exercisable. 1/48th of the shares vest monthly after the vesting commencement date of April 23, 2013, subject to cliff vesting for all months prior to July 9, 2013 and to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.
(11)	The option is early exercisable. 1/60th of the shares vest monthly after the vesting commencement date of February 13, 2014, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events.

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