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)
Chief of Staff
(Last)         (First)         (Middle)
989 MARKET STREET
3. Date of Earliest Transaction (MM/DD/YYYY)
9/7/2021
(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  9/7/2021    M(1)    3000  A $27.06  40138  D   
Common Stock  9/7/2021    S(1)    950  D $122.7933 (2) 39188  D   
Common Stock  9/7/2021    S(1)    2050  D $123.6203 (3) 37138  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)  $27.06  9/7/2021    M (1)       3000    (4) 5/9/2027  Common Stock  3000.0  $0  7800  D   

Explanation of Responses:
(1)  This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by John Geschke on November 30, 2020.
(2)  This sale price represents the weighted average sale price of the shares sold ranging from $122.23 to $123.14 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 $123.28 to $123.97 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)  1/48th of the shares subject to the option shall vest and become exercisable monthly after the vesting commencement date of May 9, 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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Geschke John
989 MARKET STREET
SAN FRANCISCO, CA 94103


Chief of Staff

Signatures
/s/ Steven Chen via Power-of-Attorney for John Geschke 9/9/2021
**Signature of Reporting Person Date
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