EXHIBIT 21.1
SUBSIDIARIES OF THE REGISTRANT
| Name |
Ownership Percentage | Jurisdiction of Organization | ||
| Alnylam U.S., Inc. | 100% | Delaware | ||
| Alnylam Europe AG | 100% | Germany | ||
| Alnylam Securities Corporation | 100% | Massachusetts | ||
| Alnylam (Bermuda) Ltd. | 100% | Bermuda | ||
| Alnylam UK Limited | 100% | United Kingdom | ||
| Alnylam Switzerland GmbH | 100% | Switzerland | ||
| Sirna Therapeutics, Inc. | 100% | Delaware |