ZEN Zendesk Inc

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 * Titterton Jeffrey J	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) Chief Marketing Officer
(Last)          (First)          (Middle) 1019 MARKET STREET	3. Date of Earliest Transaction (MM/DD/YYYY) 1/21/2020
(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	1/21/2020		M(1)		1000	A	$27.34	13901	D
Common Stock	1/21/2020		S(1)		1000	D	$84.33	12901	D
Common Stock	1/21/2020		S(1)		700	D	$84.33	12201	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)	$27.34	1/21/2020		M (1)			1000	(2)	5/16/2027	Common Stock	1000.0	$0	49000	D

Explanation of Responses:
(1)	This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by Jeffrey Titterton on June 12, 2019.
(2)	1/4th of the shares issuable pursuant to the option shall vest one year after the vesting commencement date of May 15, 2017 and an additional 1/48th of the shares issuable pursuant to the option shall vest each month 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.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Titterton Jeffrey J 1019 MARKET STREET SAN FRANCISCO, CA 94103			Chief Marketing Officer

Signatures
/s/ Hasani Caraway via Power-of-Attorney for Jeff J. Titterton		1/22/2020
**Signature of Reporting Person		Date