| FFlexospan | Sandy Lake | PA | 20–99 | ◐ LIKELY ACTIVE |
| FTFlx Technologies, LLC | Fort Worth | TX | — | ◐ LIKELY ACTIVE |
| FWForestville Welding and Iron Works, INC | Upper Marlboro | MD | — | ◐ LIKELY ACTIVE |
| FAForge and Float Works LLC | Port Townsend | WA | — | ◐ LIKELY ACTIVE |
Forms + Surfaces Carpinteria | Carpinteria | CA | 20–99 | ◐ LIKELY ACTIVE |
Forms + Surfaces Phoenix | Phoenix | AZ | 100–499 | ◐ LIKELY ACTIVE |
| FWFortin Welding & Mfg., Inc. dba Fortin Ironworks | Columbus | OH | 20–99 | ◐ LIKELY ACTIVE |
| FSFour Star Fabricators, Inc. | Petersburg | IN | 20–99 | ◐ LIKELY ACTIVE |
| FGFreedom Guard Fabrications LLC | Milliken | CO | — | ◐ LIKELY ACTIVE |
| FMFusion Metal Works LLC | Rupert | ID | — | ◐ LIKELY ACTIVE |
| FWFusion Welding and Fabrication LLC | Lakewood | NJ | — | ◐ LIKELY ACTIVE |
| GMGardner Metal Systems - Acworth Shop | Acworth | GA | 20–99 | ◐ LIKELY ACTIVE |
| GMGardner Metal Systems - Cartersville Shop | Cartersville | GA | 20–99 | ◐ LIKELY ACTIVE |
| GSGarlock Safety Systems | Plymouth | MN | 20–99 | ◐ LIKELY ACTIVE |
| GIGarzo, INC. | Waller | TX | — | ◐ LIKELY ACTIVE |
| GMGayle Manufacturing Company - Caldwell, ID | Caldwell | ID | 20–99 | ◐ LIKELY ACTIVE |
| GCGbc Csg LLC | Cub Run | KY | — | ◐ LIKELY ACTIVE |
| GAGeneral Atomics - Tupelo Campus - GTM01 - GTM07; GTM09; Trailers | Shannon | MS | 100–499 | ◐ LIKELY ACTIVE |
| GAGeneral Atomics - Tupelo - GTM08;GTM10 | Shannon | MS | 20–99 | ◐ LIKELY ACTIVE |
| GAGeneral Atomics - Tupelo - GTM11 | Shannon | MS | 20–99 | ◐ LIKELY ACTIVE |
| GSGeorge Steel Fabricating Inc. | Lebanon | OH | 20–99 | ◐ LIKELY ACTIVE |
| GSGerdau Solar Pile Midlothian | Midlothian | TX | 20–99 | ◐ LIKELY ACTIVE |
| GSG&G Steel-Cordova | Cordova | AL | 20–99 | ◐ LIKELY ACTIVE |
| GSGibson Steel & Powder Coating, LLC | Chaptico | MD | — | ◐ LIKELY ACTIVE |
| GPGingway Products Inc. | Plain City | OH | 20–99 | ◐ LIKELY ACTIVE |
| GCGlobal Correlations INC | Miami | FL | — | ◐ LIKELY ACTIVE |
| GLGlobalprimestore L.l.c | Salt Lake City | UT | — | ◐ LIKELY ACTIVE |
| GSGlobal Scaffold Construction Services INC | Hanover | MA | — | ◐ LIKELY ACTIVE |
Goergen-Mackwirth Co., Inc. DBA Niagara Frontier Custom Fabrication | Buffalo | NY | 20–99 | ◐ LIKELY ACTIVE |
| GSGordon Sales, Inc | Bossier City | LA | 100–499 | ◐ LIKELY ACTIVE |
| GIGranite Industries | Archbold | OH | 20–99 | ◐ LIKELY ACTIVE |
| GSGranite State Manufacturing | Manchester | NH | 100–499 | ◐ LIKELY ACTIVE |
| GPGrating Pacific, Inc. - Tolleson | Tolleson | AZ | 1–19 | ◐ LIKELY ACTIVE |
| GPGrating Pacific, Inc. - Tracy | Tracy | CA | 1–19 | ◐ LIKELY ACTIVE |
| GPGrating Pacific, LLC. - kent | Kent | WA | 1–19 | ◐ LIKELY ACTIVE |
| GPGreat Plains Tower Products LLC | Fargo | ND | — | ◐ LIKELY ACTIVE |
Greenberry Industrial - Atlantic Division | Weldon | NC | 20–99 | ◐ LIKELY ACTIVE |
Greenberry Industrial - Gulf Coast | Sulphur | LA | 500+ | ◐ LIKELY ACTIVE |
Greenberry industrial Northwest Division | Vancouver | WA | 500+ | ◐ LIKELY ACTIVE |
| GSGremp Steel Company | Posen | IL | 20–99 | ◐ LIKELY ACTIVE |
| GCGrit Cutting Solutions, LLC | Ogden | UT | — | ◐ LIKELY ACTIVE |
| GTGri Towers USA INC | Amarillo | TX | 100–499 | ◐ LIKELY ACTIVE |
| GGGrs Gate Repair Services LLC | Las Vegas | NV | — | ◐ LIKELY ACTIVE |
| GCGulf Coast Welding Inc | Foley | AL | 20–99 | ◐ LIKELY ACTIVE |
| GIGulf Island - Fabrication Yard | Houma | LA | 100–499 | ◐ LIKELY ACTIVE |
| GWG Welding & Fabrication LLC | Fort Worth | TX | — | ◐ LIKELY ACTIVE |
| HFHadrian - Factory X | Torrance | CA | 20–99 | ◐ LIKELY ACTIVE |
| HMHall Manufacturing Technology, LLC. | Grove City | PA | 20–99 | ◐ LIKELY ACTIVE |
| HSHanley Steel, Inc. | Peoria | IL | 20–99 | ◐ LIKELY ACTIVE |
| HFHarbor Fab-Cleburne | Cleburne | TX | 1–19 | ◐ LIKELY ACTIVE |