| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | 2 K Plumbing & Fire Protection | fire protection engineering | 1 |
| 2 | Aaa Fire Protection | fire protection engineering | 1 |
| 3 | Aaa Fire Sprinklers | fire protection engineering | 1 |
| 4 | Aaa Mech Svcs. | fire protection engineering | 0 |
| 5 | A & A Fire Sprinklers | fire protection engineering | 1 |
| 6 | A & A Sprinkler Company Inc | fire protection engineering | 1 |
| 7 | ABC Fire Equipment Corp. | fire protection engineering | 1 |
| 8 | Abco Fire Protection | fire protection engineering | 1 |
| 9 | AB Fire Equipment | fire protection engineering | 1 |
| 10 | A B J Fire Protection Inc. | fire protection engineering | 3 |
| 11 | Absolute Fire Protection | fire protection engineering | 1 |
| 12 | Absolute Fire Protection | fire protection engineering | 1 |
| 13 | Accel Fire Systems | fire protection engineering | 0 |
| 14 | Access Fire Protection | fire protection engineering | 8 |
| 15 | Accurate Fire Protection Systems LLC | fire protection engineering | 1 |
| 16 | Accurate Systems | fire protection engineering | 2 |
| 17 | Ace Fire Protection | fire protection engineering | 0 |
| 18 | Ace Sprinkler Co. | fire protection engineering | 1 |
| 19 | Ace Sprinkler Company | fire protection engineering | 1 |
| 20 | A & D Fire Protection Service | fire protection engineering | 0 |