| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Eagle Fire Protection Company | Fire protection engineering | 1 |
| 2 | Eagle Fire Protection Inc. | Fire protection engineering | 0 |
| 3 | East Coast Fire Protection, Inc. | Fire protection engineering | 3 |
| 4 | East Tennesse Sprinkler Company | Fire protection engineering | 0 |
| 5 | ECE Brandschutz GmbH | Fire protection engineering | 3 |
| 6 | Eckert Fire Protection, Inc. | Fire protection engineering | 0 |
| 7 | Economy Plumbing & Fire Protection | Fire protection engineering | 0 |
| 8 | Edward J Matthews Inc | Fire protection engineering | 3 |
| 9 | Effertz Tore GmbH | Fire protection engineering | 1 |
| 10 | Egan Automation, Inc. | Fire protection engineering | 1 |
| 11 | Electronic Protection Systems | Fire protection engineering | 12 |
| 12 | Electronic Protection Systems | Fire protection engineering | 0 |
| 13 | Elite Fire Protection | Fire protection engineering | 2 |
| 14 | Elpas | Fire protection engineering | 2 |
| 15 | Emergency Fire Protection Systems | Fire protection engineering | 1 |
| 16 | Engineered Fire Protection Inc. | Fire protection engineering | 1 |
| 17 | Entire Fire Limited | Fire protection engineering | 5 |
| 18 | Environmental Fire Protection Inc | Fire protection engineering | 0 |
| 19 | ESI Group | Fire protection engineering | 7 |
| 20 | Essential Fire Protection Systems Inc. | Fire protection engineering | 1 |