| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | 2 K Plumbing & Fire Protection | Fire protection engineering | 1 |
| 2 | A & A Fire Sprinklers | Fire protection engineering | 2 |
| 3 | A & A Sprinkler Company Inc | Fire protection engineering | 1 |
| 4 | A & D Fire Protection Service | Fire protection engineering | 0 |
| 5 | A Fire & Safety Equipment | Fire protection engineering | 0 |
| 6 | A. Peter Tankel, P.E. | Fire protection engineering | 1 |
| 7 | A&E Services | Fire protection engineering | 5 |
| 8 | Aaa Fire Protection | Fire protection engineering | 1 |
| 9 | Aaa Fire Sprinklers | Fire protection engineering | 1 |
| 10 | Aaa Mech Svcs. | Fire protection engineering | 0 |
| 11 | AB Fire Equipment | Fire protection engineering | 1 |
| 12 | ABC Fire Equipment Corp. | Fire protection engineering | 1 |
| 13 | Abco Fire Protection | Fire protection engineering | 1 |
| 14 | ABJ Fire Protection Inc. | Fire protection engineering | 3 |
| 15 | Absolute Fire Protection | Fire protection engineering | 1 |
| 16 | Absolute Fire Protection | Fire protection engineering | 1 |
| 17 | Accel Fire Systems | Fire protection engineering | 0 |
| 18 | Access Fire Protection | Fire protection engineering | 7 |
| 19 | Accurate Fire Protection Systems LLC | Fire protection engineering | 1 |
| 20 | Accurate Systems | Fire protection engineering | 2 |