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
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	                      	

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)
GC, SVP Admin and Secretary	
(Last)          (First)          (Middle)

1019 MARKET STREET	3. Date of Earliest Transaction (MM/DD/YYYY)

9/13/2016		
(Street)

SAN FRANCISCO, CA 94103
(City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)

 	6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1.Title of Security
(Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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  	9/13/2016  	 	M (1)	  	5000  	A	$2.30  	11175  	D  	 	
Common Stock  	9/13/2016  	 	M (1)	  	5000  	A	$6.24  	16175  	D  	 	
Common Stock  	9/13/2016  	 	S (1)	  	10000  	D	$29.5037   (2)	6175  	D  	 	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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	7. Title and Amount of Securities Underlying Derivative Security
(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					
Stock Option (Right to Buy)  	$2.30  	9/13/2016  	 	M   (1)	  	  	5000   	  (3)	7/18/2022  	Common Stock  	5000  	$0  	11615  	D  	 	
Stock Option (Right to Buy)  	$6.24  	9/13/2016  	 	M   (1)	  	  	5000   	  (4)	5/3/2023  	Common Stock  	5000  	$0  	75000  	D  	 	

Explanation of Responses:	
(  1) 	This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.	
(  2) 	This sale price represents the weighted average sale price of the shares sold ranging from $29.25 to $30.10 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.	
(  3) 	The option is immediately exercisable as of the grant date. 1/4th of the shares vested on July 9, 2013 and 1/48th of the shares vest monthly thereafter, 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. Unvested shares exercised are subject to a right of repurchase in favor of the Company should the Reporting Person cease to provide continuous service.	
(  4) 	The option is immediately exercisable as of the grant date. 3/48ths of the shares vested on July 23, 2013 and 1/48th of the shares vest monthly thereafter, 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. Unvested shares exercised are subject to a right of repurchase in favor of the Company should the Reporting Person cease to provide continuous service.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
Geschke John
1019 MARKET STREET
SAN FRANCISCO, CA 94103			GC, SVP Admin and Secretary		

Signatures		
/s/ Hasani Caraway, attorney-in-fact for John Geschke		9/15/2016	
** Signature of Reporting Person		Date

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).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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