Exhibit 21.1
The following is a list of subsidiaries of the Company as of December 31, 2017:
| Subsidiary Legal Name | 
 | State or other Jurisdiction of Incorporation | 
| Nina Biotherapeutics, Inc. | 
 | Delaware | 
| Pinta Biotherapeutics, Inc. | 
 | Delaware | 
| Santa Maria Biotherapeutics, Inc. | 
 | Delaware | 
| Atara Biotherapeutics Cayman Limited | 
 | Cayman Islands | 
| Atara Biotherapeutics Ireland Limited Atara Biotherapeutics Switzerland GmbH | 
 | Ireland Switzerland 
 |