| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | G & G Fire Sprinklers Inc | Fire protection engineering | 0 |
| 2 | G & H Fire Protection Inc | Fire protection engineering | 0 |
| 3 | Gage-Babcock & Associates | Fire protection engineering | 4 |
| 4 | Gailey Fire Protection Inc. | Fire protection engineering | 1 |
| 5 | Gale Fireproofing | Fire protection engineering | 0 |
| 6 | General Automatic Fire Protection Company. | Fire protection engineering | 1 |
| 7 | General Automatic Sprinkler | Fire protection engineering | 0 |
| 8 | General Underground Fire Protection Inc. | Fire protection engineering | 1 |
| 9 | George Robinson & Company. | Fire protection engineering | 1 |
| 10 | Georgia Automatic Sprinklers | Fire protection engineering | 0 |
| 11 | Gielle SRL | Fire protection engineering | 0 |
| 12 | Glendale Fire Systems Inc | Fire protection engineering | 1 |
| 13 | Global Fire Protection Company | Fire protection engineering | 15 |
| 14 | Global Insulation & Fireproofing | Fire protection engineering | 1 |
| 15 | Global Sanchez | Fire protection engineering | 1 |
| 16 | Gluske Brandschutz-Service GmbH | Fire protection engineering | 0 |
| 17 | Green Fire Systems | Fire protection engineering | 1 |
| 18 | Grinnel Fire Protection | Fire protection engineering | 0 |
| 19 | Grinnell | Fire protection engineering | 0 |
| 20 | Grinnell Fire Protection | Fire protection engineering | 0 |