| # | Company name | Role | # of projects |
|---|---|---|---|
| 81 | American Auto Sprinkler Systems | Fire protection engineering | 2 |
| 82 | American Automatic Fire Protection | Fire protection engineering | 3 |
| 83 | American Automatic Fire Sprinkler | Fire protection engineering | 1 |
| 84 | American Automatic Sprinkler | Fire protection engineering | 2 |
| 85 | American Automatic Sprinklers | Fire protection engineering | 1 |
| 86 | American Fire Protection Co | Fire protection engineering | 0 |
| 87 | American Fire Sprinkler | Fire protection engineering | 0 |
| 88 | American Fire Sprinkler Corp. | Fire protection engineering | 1 |
| 89 | American Fire Systems | Fire protection engineering | 2 |
| 90 | American Plumbing & Mechanical - Ampam | Fire protection engineering | 1 |
| 91 | American Sprinkler Co | Fire protection engineering | 0 |
| 92 | Ameritex Fire Protection | Fire protection engineering | 1 |
| 93 | AMPAC Technologies | Fire protection engineering | 3 |
| 94 | Anchor Fire Protection Co. | Fire protection engineering | 0 |
| 95 | Andec Fire Systems Australia Pty Ltd | Fire protection engineering | 1 |
| 96 | Ann Arbor Fire Protection | Fire protection engineering | 0 |
| 97 | Anne Arundel Fire Protection Inc | Fire protection engineering | 0 |
| 98 | Ansul Incorporated | Fire protection engineering | 0 |
| 99 | Aon Fire Protection Engineering | Fire protection engineering | 3 |
| 100 | Aqua Safe Fire Protection Co Inc | Fire protection engineering | 1 |