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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1496671	Calithera Biosciences Inc.	CALA	Pharmaceutical Preparations (2834)	272366329

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1291804	Jean George	C/O Advanced Technology Ventures 500 Boylston Street, Suite 1380 Boston MA 02116		Yes	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	Acquisiton	2014-10-07	1,810,082	$0.00	1,810,082	No	4	C	Indirect	By Partnership
Common Stock	Acquisiton	2014-10-07	300,000	$10.00	2,110,082	No	4	P	Indirect	By Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	By Partnership
No	4	P	Indirect	By Partnership

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	SERIES A PREFERRED STOCK	Acquisiton	2014-10-07	9,166	$0.00	9,166	$0.00
Common Stock	SERIES B PREFERRED STOCK	Acquisiton	2014-10-07	419,181	$0.00	419,181	$0.00
Common Stock	SERIES C PREFERRED STOCK	Acquisiton	2014-10-07	747,540	$0.00	747,540	$0.00
Common Stock	SERIES D PREFERRED STOCK	Acquisiton	2014-10-07	634,195	$0.00	634,195	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

The Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock and Series D Preferred Stock automatically converted into Common Stock on a one for one basis immediately prior to the consummation of Issuer's initial public offering of Common Stock and had no expiration date.
ATV Associates VIII, L.L.C. ("ATV A VIII") is the general partner of Advanced Technology Ventures VIII, L.P. ("ATV VIII") and exercises voting and dispositive authority over the shares held by ATV VIII. Jean M. George, a director of the Issuer, is a managing director of ATV A VIII and exercises voting and dispositive decisions of ATV A VIII collectively with each of the four other managing directors. ATV A VIII and each of the managing directors disclaim beneficial ownership of these securities and this report shall not be deemed an admission that they are the beneficial owners of such securities for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interest therein.