Exhibit 21.1
Subsidiaries of Collegium Pharmaceutical, Inc.
| Subsidiary | Jurisdiction of Incorporation | 
| Collegium Securities Corporation | Massachusetts | 
| Collegium NF, LLC | Delaware | 
| BioDelivery Sciences International, Inc. | Delaware | 
| Arius Pharmaceuticals, Inc. | Delaware | 
| Arius Two, Inc. | Delaware | 
| Ironshore Therapeutics, Inc. | Cayman Islands | 
| Ironshore Pharmaceuticals & Development, Inc. | Cayman Islands | 
| Ironshore Pharmaceuticals Inc. | Delaware | 
| Ironshore Pharmaceuticals Canada Inc. | Canada | 
|  |  | 
|  |  | 
|  |  | 
|  |  |