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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1463172	Zendesk Inc.	ZEN	Services-Computer Processing & Data Preparation (7374)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1211433	J Alan Black	1019 Market Street San Francisco CA 94103	Svp And Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2016-01-21	2,000	$6.24	133,488	No	4	M	Direct
Common Stock	Acquisiton	2016-01-21	3,600	$9.52	137,088	No	4	M	Direct
Common Stock	Disposition	2016-01-21	5,600	$24.00	131,488	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2016-01-21	2,000	$0.00	2,000	$6.24
Common Stock	Stock Option (Right to Buy)	Disposition	2016-01-21	3,600	$0.00	3,600	$9.52

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
61,100		2023-05-03	No	4	M	Direct
80,400		2024-02-13	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	250,300	Indirect	Alan J. Black and Linda J. Black, Trustees of Black Family Trust - 2001 U/I DTD. November 26, 2001
Common Stock	40,000	Indirect	By Black 2013 Family Heritage Trust
Common Stock	40,000	Indirect	By Black 2014 Family Heritage Trust

Footnotes

This transaction was effected pursuant to Rule 10b5-1 trading plans adopted by the Reporting Person.
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.
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.