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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	Director	Officer	Large Shareholder	Other
1417731	Charles River Friends Xiii-A Lp	C/O Charles River Ventures One Broadway, 15Th Floor Cambridge MA 02142	No	No	Yes	No
1519780	Charles River Xiii Gp, Llc	C/O Charles River Ventures One Broadway, 15Th Floor Cambridge MA 02142	No	No	Yes	No
1519781	Charles River Partnership Xiii, Lp	C/O Charles River Ventures One Broadway, 15Th Floor Cambridge MA 02142	No	No	Yes	No
1519804	Charles River Xiii Gp, Lp	C/O Charles River Ventures One Broadway, 15Th Floor Cambridge MA 02142	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2015-03-24	400,000	$21.76	11,337,078	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote

Footnotes

The number of shares sold includes 389,079 shares sold by Charles River Partnership XIII, LP ("CRP XIII LP") and 10,921 shares sold by Charles River Friends XIII-A, LP ("CRF XIII-A").
The number of shares owned after the sale includes 11,027,557 shares held by CRP XIII LP and 309,521 shares held by CRF XIII-A.
Charles River XIII GP, LP, ("CR XIII GP LP") is the general partner of CRP XIII LP. Charles River XIII GP, LLC is the general partner of both CRF XIII-A and CR XIII GP LP. Each reporting person may be deemed to beneficially own the reported securities, but each disclaims beneficial ownership of such reported securities except to the extent of its pecuniary interest therein. The filing of this statement by any reporting person shall not be deemed an admission that such person is, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of any equity securities covered by this statement.