SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
SOON-SHIONG PATRICK	

(Last)	(First)	(Middle)	
C/O NANTKWEST, INC.	
3530 JOHN HOPKINS COURT	

(Street) 
SAN DIEGO	CA	92121	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
NantKwest, Inc. [ NK ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
X	Director	X	10% Owner	
X	Officer (give title below)		Other (specify below)	
Chairman and CEO	
		
	3. Date of Earliest Transaction (Month/Day/Year)
08/21/2015 		
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) 
	Form filed by One Reporting Person	
X	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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	08/21/2015		P		450,000	A	$23 	41,016,557	I	See footnote(1) 	
Common Stock								600,000(2) 	D		
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)	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: 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					
1. Name and Address of Reporting Person*
SOON-SHIONG PATRICK	

(Last)	(First)	(Middle)	
C/O NANTKWEST, INC.	
3530 JOHN HOPKINS COURT	

(Street) 
SAN DIEGO	CA	92121	

(City)	(State)	(Zip)	
	
1. Name and Address of Reporting Person*
Cambridge Equities, LP	

(Last)	(First)	(Middle)	
C/O NANTKWEST, INC.	
2533 SOUTH COAST HIGHWAY 101, SUITE 210	

(Street) 
CARDIFF-BY-THE-SEA	CA	92007-2133	

(City)	(State)	(Zip)	
	
1. Name and Address of Reporting Person*
MP 13 Ventures, LLC	

(Last)	(First)	(Middle)	
C/O NANTKWEST, INC.	
2533 SOUTH COAST HIGHWAY 101, SUITE 210	

(Street) 
CARDIFF-BY-THE-SEA	CA	92007-2133	

(City)	(State)	(Zip)	
	
Explanation of Responses:	
1. Shares held by Cambridge Equities, LP ("Cambridge Equities"). MP 13 Ventures, LLC ("MP 13 Ventures") is the general partner of Cambridge Equities and may be deemed to have beneficial ownership of the shares held by Cambridge Equities. The reporting person is the sole member of MP 13 Ventures and has voting and dispositive power over the shares held by Cambridge Equities.	
2. Each restricted stock unit ("RSU") represents a contingent right to receive one share of NantKwest, Inc. common stock. Subject to the reporting person's continuing to be a Service Provider (as defined in the 2015 Equity Incentive Plan) through each applicable vesting date, the RSUs will vest as follows: 50% of the RSUs vested on the July 27, 2015, and 50% of the RSUs will vest on July 27, 2016.	
Remarks:	
	
	/s/ Patrick Soon-Shiong and /s/ Charles Kenworthy, Manager of MP 13 Ventures, on behalf of itself and as General Partner of Cambridge Equities	08/25/2015	
	** 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 4 (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 Number.