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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1. Name and Address of Reporting Person * BLACK ALAN 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) SVP and CFO (Last) (First) (Middle) 1019 MARKET STREET 3. Date of Earliest Transaction (Month/Day/Year) 12/15/2015 (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 12/02/2015   G V 1,000 D $ 0 156,099 D   Common Stock 12/09/2015   G V 12,500 D $ 0 143,599 D   Common Stock 12/09/2015   G V 12,500 A $ 0 252,800 I Alan J. Black and Linda J. Black, Trustees of Black Family Trust - 2001 U/I DTD. November 26, 2001 Common Stock 12/15/2015   S(1)   15,000 D $ 25.8228 (2) 237,800 I Alan J. Black and Linda J. Black, Trustees of Black Family Trust - 2001 U/I DTD. November 26, 2001 Common Stock 12/15/2015   M(1)   3,600 A $ 6.24 147,199 D   Common Stock 12/15/2015   M(1)   2,000 A $ 9.52 149,199 D   Common Stock 12/15/2015   S(1)   5,600 D $ 25.8213 (3) 143,599 D   Common Stock 12/15/2015   M   375 A (4) 143,974 D   Common Stock 12/15/2015   F   196 (5) D $ 26.13 143,778 D   Common Stock               40,000 I By Black 2013 Family Heritage Trust Common Stock               40,000 I By Black 2014 Family Heritage Trust

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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

Stock Option (Right to Buy)

$ 6.24

12/15/2015

M(1)

3,600

(6)

05/03/2023

Common Stock

3,600

$ 0

63,100

D

Stock Option (Right to Buy)

$ 9.52

12/15/2015

M(1)

2,000

(7)

02/13/2024

Common Stock

2,000

$ 0

84,000

D

Restricted Stock Unit

(4)

12/15/2015

M

375

(8)

02/04/2022

Common Stock

375

(4)

14,251

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BLACK ALAN J 1019 MARKET STREET SAN FRANCISCO, CA 94103			SVP and CFO

Signatures

/s/ John Geschke, Attorney-in-Fact for Alan J. Black		12/16/2015
**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)	This transaction was effected pursuant to Rule 10b5-1 trading plans adopted by the Reporting Person.
(2)	This sale price represents the weighted average sale price of the shares sold ranging from $25.33 to $26.07 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)	This sale price represents the weighted average sale price of the shares sold ranging from $25.47 to $26.045 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.
(4)	Restricted stock units convert into common stock on a one-for-one basis.
(5)	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.
(6)	The option is immediately exercisable as of the grant date. 1/48th of the shares vest monthly after April 23, 2013, 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.
(7)	The option is immediately exercisable as of the grant date. 1/60th of the shares vest monthly after 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. Unvested shares exercised are subject to a right of repurchase in favor of the Company should the Reporting Person cease to provide continuous service.
(8)	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.

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