Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	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 * Wong Stephanie	2. Date of Event Requiring Statement (MM/DD/YYYY) 1/1/2017	3. Issuer Name and Ticker or Trading Symbol Calithera Biosciences, Inc. [CALA]
(Last)        (First)        (Middle) C/O CALITHERA BIOSCIENCES, INC., 343 OYSTER POINT BLVD. #200	4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                            _____ 10% Owner ___ X ___ Officer (give title below)          _____ Other (specify below) VP, FINANCE /
(Street) SOUTH SAN FRANCISCO, CA 94080        (City)              (State)              (Zip)	5. 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 Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	14102	I	By Trust   (1)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
STOCK OPTION (RIGHT TO BUY)	(2)	3/31/2024	COMMON STOCK	33284	$2.64	D
STOCK OPTION (RIGHT TO BUY)	(3)	9/8/2024	COMMON STOCK	8433	$7.20	D
STOCK OPTION (RIGHT TO BUY)	(4)	2/10/2025	COMMON STOCK	25000	$16.40	D
STOCK OPTION (RIGHT TO BUY)	(5)	1/18/2026	COMMON STOCK	32500	$4.71	D
STOCK OPTION (RIGHT TO BUY)	(6)	11/28/2026	COMMON STOCK	25000	$3.35	D
STOCK OPTION (RIGHT TO BUY)	(7)	12/27/2026	COMMON STOCK	25000	$3.15	D

Explanation of Responses:
( 1)	Shares are held by the Wong Family Trust, of which the Reporting Person is a Trustee.
( 2)	One-forty-eighth (1/48th) of the Option vests in equal monthly installments one month after April 1, 2014. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.
( 3)	One-forty-eighth (1/48th) of the Option vests in equal monthly installments one month after September 9, 2014. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.
( 4)	One-fourth (1/4th) of the Option vests one year after February 11, 2015; the balance of the Option vests in a series of thirty-six (36) successive equal monthly installments thereafter. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.
( 5)	One-fourth (1/4th) of the Option vests one year after January 19, 2016; the balance of the Option vests in a series of thirty-six (36) successive equal monthly installments thereafter. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.
( 6)	One-fourth (1/4th) of the Option vests one year after November 29, 2016; the balance of the Option vests in a series of thirty-six (36) successive equal monthly installments thereafter. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.
( 7)	One-fourth (1/4th) of the Option vests one year after December 28, 2016; the balance of the Option vests in a series of thirty-six (36) successive equal monthly installments thereafter. The Option shall be subject to accelerated vesting as set forth in the optionee's employment agreement with the Company.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Wong Stephanie C/O CALITHERA BIOSCIENCES, INC. 343 OYSTER POINT BLVD. #200 SOUTH SAN FRANCISCO, CA 94080			VP, FINANCE

Signatures
/s/ Stephanie Wong, Name: Stephanie Wong		1/6/2017
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(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).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.