SEC Form 3 
FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person*
Redmile Group, LLC	

(Last)	(First)	(Middle)	
ONE LETTERMAN DRIVE	
BUILDING D, SUITE D3-300	

(Street) 
SAN FRANCISCO	CA	94129	

(City)	(State)	(Zip)	
	2. Date of Event Requiring Statement (Month/Day/Year)
06/19/2019 	3. Issuer Name and Ticker or Trading Symbol 
Atreca, Inc. [ BCEL ] 		
		4. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director	X	10% Owner	
	Officer (give title below)		Other (specify below)	
	
	5. 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 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) 	
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 4) 	2. Date Exercisable and Expiration Date (Month/Day/Year)	3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 	4. Conversion or Exercise Price of Derivative Security 	5. Ownership Form: 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				
Series C1 Convertible Preferred Stock	(1) 	(1) 	Common Stock	715,306(1) 	(1)	I	Footnote(2) 	
1. Name and Address of Reporting Person*
Redmile Group, LLC	

(Last)	(First)	(Middle)	
ONE LETTERMAN DRIVE	
BUILDING D, SUITE D3-300	

(Street) 
SAN FRANCISCO	CA	94129	

(City)	(State)	(Zip)	
	
1. Name and Address of Reporting Person*
Green Jeremy	

(Last)	(First)	(Middle)	
C/O REDMILE GROUP, LLC	
ONE LETTERMAN DR, BUILDING D STE D3-300	

(Street) 
SAN FRANCISCO	CA	94129	

(City)	(State)	(Zip)	
	
Explanation of Responses:	
1. The Series C1 Convertible Preferred Stock is convertible into shares of the Issuer's common stock at any time, at the holder's election, on a 1-for-1 basis and has no expiration date.	
2. These securities are directly owned by certain private investment vehicles managed by Redmile Group, LLC ("Redmile") and may be deemed beneficially owned by Redmile as investment manager of such private investment vehicles. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. The Reporting Persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Persons are the beneficial owners of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.	
	/s/ Jeremy Green, Managing Member of Redmile Group, LLC	06/19/2019	
	/s/ Jeremy Green	06/19/2019	
	** 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.	
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