 International Door, INC. | North Kingstown | RI | — | ◇ UNVERIFIED |
| IIInternational Impact Building Products LLC | West Palm Bch | FL | — | ◇ UNVERIFIED |
| IIIntigral, INC. | Cleveland | OH | — | ◇ UNVERIFIED |
| ISIsland Screen INC. | Waipahu | HI | — | ◇ UNVERIFIED |
| ISIsland Style Windows and Doors, Inc. | Naples | FL | — | ◇ UNVERIFIED |
| JIJada INC | Grass Valley | CA | — | ◇ UNVERIFIED |
| JSJansen Shutters & Specialties | Venice | FL | — | ◇ UNVERIFIED |
| JIJanus International | Orlando | FL | — | ◇ UNVERIFIED |
| JWJeld Wen | Ozark | AL | — | ◇ UNVERIFIED |
| JHJeld-wen Holding, INC. | Venice | FL | — | ◇ UNVERIFIED |
| JMJ & M Precision Sheetmetal | Cotati | CA | — | ◇ UNVERIFIED |
| JCJohnson Contracting Solutions INC | Portland | OR | — | ◇ UNVERIFIED |
| JIJ&s Innovations, LLC | White Bear Lake | MN | — | ◇ UNVERIFIED |
| JWJs West and Companies | Modesto | CA | — | ◇ UNVERIFIED |
| JAJupiter Aluminum Corporation, Jupiter Coil Coating | Beech Bottom | WV | — | ◇ UNVERIFIED |
| JWJw Window Components INC D/b/a Ritescreen | Elizabethton | TN | — | ◇ UNVERIFIED |
| KMKairos Mfg INC Dba Architectural Iron Works | San Luis Obispo | CA | — | ◇ UNVERIFIED |
| KDKalmont Distributors INC | Kalispell | MT | — | ◇ UNVERIFIED |
| KSKarpen Steel Products INC | Farmingdale | NY | — | ◇ UNVERIFIED |
| KSKarpen Steel Products, INC. | Weaverville | NC | — | ◇ UNVERIFIED |
| KCKawneer Company INC | Orlando | FL | — | ◇ UNVERIFIED |
| KCKawneer Company INC | Riverside | CA | — | ◇ UNVERIFIED |
| KCKawneer Company INC. | Hanover | MD | — | ◇ UNVERIFIED |
| KCKawneer Company, INC. | Roselle | IL | — | ◇ UNVERIFIED |
| KBK Building Components INC | Hibbing | MN | — | ◇ UNVERIFIED |
| KBKelley Bros LLC | De Ruyter | NY | — | ◇ UNVERIFIED |
| KDKendell Doors - Hardware INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| KCKewanee CORP | Kewanee | IL | — | ◇ UNVERIFIED |
| KGKodiak Gypsum Mountain States, LLC | Carrollton | TX | — | ◇ UNVERIFIED |
| KFKt Fabrication INC | Chandler | AZ | — | ◇ UNVERIFIED |
| LDLacantina Doors | Oceanside | CA | — | ◇ UNVERIFIED |
| LILaforce, INC. | Vernon Hills | IL | — | ◇ UNVERIFIED |
| LALake Air Metal Products INC | Coon Rapids | MN | — | ◇ UNVERIFIED |
| LAL and T Precision INC (machine Shop) | San Jose | CA | — | ◇ UNVERIFIED |
| LELang Exterior, INC. | Chicago | IL | — | ◇ UNVERIFIED |
| LMLarsen's Manufacturing CO | Minneapolis | MN | — | ◇ UNVERIFIED |
| LDLausell Del Caribe LLC | Barceloneta | PR | — | ◇ UNVERIFIED |
| LPLci Plant 119 | Bristol | IN | — | ◇ UNVERIFIED |
| LMLeonard Metal Fabricators, Inc | Pearl | MS | — | ◇ UNVERIFIED |
| LWLeone Welding and Fabrication | Sevierville | TN | — | ◇ UNVERIFIED |
| LDLifetime Doors, INC. | Los Banos | CA | — | ◇ UNVERIFIED |
| LILif Industries, INC. | Port Washington | NY | — | ◇ UNVERIFIED |
| LILindan Industries LLC | Cincinnati | OH | — | ◇ UNVERIFIED |
| LILindan Industries LLC | Hamilton | OH | — | ◇ UNVERIFIED |
| LWLindsay Windows South LLC | Cumming | GA | — | ◇ UNVERIFIED |
| LMLin-ian Metals (guam) CORP | Tamuning | GU | — | ◇ UNVERIFIED |
 Lippert Components | South Bend | IN | — | ◇ UNVERIFIED |
| Lippert Components, INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| Lippert Components, Inc, -148 | Nappanee | IN | — | ◇ UNVERIFIED |
| Lippert Components Manufacturing, INC. | Double Springs | AL | — | ◇ UNVERIFIED |
| LLL & L Louvers INC | Riverside | CA | — | ◇ UNVERIFIED |
| LDLmr Doors & Windows, INC. | Quebradillas | PR | — | ◇ UNVERIFIED |
| LSLobato Studio LLC | New Braunfels | TX | — | ◇ UNVERIFIED |
| LWLockheed Window CORP | South Easton | MA | — | ◇ UNVERIFIED |
| LWLockheed Window CORP. | Pascoag | RI | — | ◇ UNVERIFIED |
| LILur INC | Pomona | CA | — | ◇ UNVERIFIED |
| LLLuxView, LLC | Nashville | TN | — | ◇ UNVERIFIED |
| MHM2h2 Holdings LLC Dba Claborn Manufacturing | Tanner | AL | — | ◇ UNVERIFIED |
| MCMac Cal CO INC | San Jose | CA | — | ◇ UNVERIFIED |
| MWMalibu Window and Door | South El Monte | CA | — | ◇ UNVERIFIED |
| MWManko Window Systems, INC. | Manhattan | KS | — | ◇ UNVERIFIED |
| MMMantua Manufacturing CO. | Tampa | FL | — | ◇ UNVERIFIED |
| MHMascotte Home Security Products INC | Portland | OR | — | ◇ UNVERIFIED |
| MCMason Corporation | Birmingham | AL | — | ◇ UNVERIFIED |
| MDMasonite Door Corporation | Richmond | IN | — | ◇ UNVERIFIED |
| MSMastercare Shutter Corporation | Hobe Sound | FL | — | ◇ UNVERIFIED |
| MPMastercore Products | San Marcos | CA | — | ◇ UNVERIFIED |
| MWMaster Window Systems, INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| MHMastic Home Exteriors, INC. | Sidney | OH | — | ◇ UNVERIFIED |
| MAM & a Windows, INC. | Lake Worth | FL | — | ◇ UNVERIFIED |
| MDMckendry Door Sales INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| MSMCM Skylights LLC | Garland | TX | — | ◇ UNVERIFIED |
| MIMcwi INC. | Jamaica | NY | — | ◇ UNVERIFIED |
| MUMdm Utah, LLC | South Salt Lake | UT | — | ◇ UNVERIFIED |
| MMMeddco Metals | Hayward | CA | — | ◇ UNVERIFIED |
| MGMetal & Glass Solutions CORP. | Brooklyn | NY | — | ◇ UNVERIFIED |
 Metal Industries, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| MFMetalline Fire Door Co., INC. | Bronx | NY | — | ◇ UNVERIFIED |
| MPMetal Pro Group Inc | Dover | NJ | — | ◇ UNVERIFIED |
| MPMetal Pro Industries INC | Valencia | CA | — | ◇ UNVERIFIED |
| MSMetal Spray Painting, INC. | Coral Springs | FL | — | ◇ UNVERIFIED |
| MSMetro Screenworks, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| MIMgm Industries Incorporated | Hendersonville | TN | — | ◇ UNVERIFIED |
| MWMgm Window CO INC | Hendersonville | TN | — | ◇ UNVERIFIED |
| MWMiami Wall Systems, INC. | Hialeah | FL | — | ◇ UNVERIFIED |
| MDMichael D. Schoeneman | Rancho Cordova | CA | — | ◇ UNVERIFIED |
| MCMid Central Door Company INC | Waite Park | MN | — | ◇ UNVERIFIED |
| MGMidland Garage Door Manufacturing Company | Chaska | MN | — | ◇ UNVERIFIED |
| MGMidland Garage Door Manufacturing Company | West Fargo | ND | — | ◇ UNVERIFIED |
| MCMidwest Curtainwalls | Cuyahoga Heights | OH | — | ◇ UNVERIFIED |
| MFMidwest Fabrication & Welding, LLC | Tipton | IA | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing | Holiday City | OH | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing | Sullivan | MO | — | ◇ UNVERIFIED |
| MWMidwest Window and Door | Springfield | MO | — | ◇ UNVERIFIED |
| MBMilco Building Products, INC. | Swainsboro | GA | — | ◇ UNVERIFIED |
| MMMilgard Manufacturing INC | Temecula | CA | — | ◇ UNVERIFIED |
| MMMilgard Mfg INC | Tacoma | WA | — | ◇ UNVERIFIED |
| MDMillennium Doors and Windows Inc | Isabela | PR | — | ◇ UNVERIFIED |
| MDMillennium Doors and Windows Inc. | Isabela | PR | — | ◇ UNVERIFIED |
| MMMilliken Millwork INC | Sterling Heights | MI | — | ◇ UNVERIFIED |
