| HMHennepin Made LLC | Minneapolis | MN | — | ◇ UNVERIFIED |
| HMHerbert Malarkey Roofing Company | Williamsport | MD | — | ◇ UNVERIFIED |
| HIHessco Ind INC | La Habra | CA | — | ◇ UNVERIFIED |
| HDHolly Decorations INC | Sparks | NV | — | ◇ UNVERIFIED |
| HIHot Island Glass, LTD. | Makawao | HI | — | ◇ UNVERIFIED |
| ILIc Lights, LLC | Nokomis | IL | — | ◇ UNVERIFIED |
| IMIko Mat Tech INC | Chester | SC | — | ◇ UNVERIFIED |
| IGIndiana Glass Company, INC. | Dunkirk | IN | — | ◇ UNVERIFIED |
| IGIsland Glass Studios LLC | Point Harbor | NC | — | ◇ UNVERIFIED |
| JSJeannette Specialty /jeannette Shade & Novelty | Jeannette | PA | — | ◇ UNVERIFIED |
| JGJlm Glass Studio LLC | Dayton | OH | — | ◇ UNVERIFIED |
 Johns Manville | Cleburne | TX | — | ◇ UNVERIFIED |
| JMJonathan Metal & Glass LTD. | New York | NY | — | ◇ UNVERIFIED |
| JGJusti Group, INC. | Oldsmar | FL | — | ◇ UNVERIFIED |
| KSKamran Staffing INC | South Gate | CA | — | ◇ UNVERIFIED |
| KOKokomo Opalescent Glass Company | Kokomo | IN | — | ◇ UNVERIFIED |
| LSLamp Service Products | Orange | CA | — | ◇ UNVERIFIED |
| LGLancaster Glass Corporation * | Lancaster | OH | — | ◇ UNVERIFIED |
| LLLedvance LLC | Exeter | NH | — | ◇ UNVERIFIED |
| LLLedvance LLC - Glass Plant | Versailles | KY | — | ◇ UNVERIFIED |
| LILenox Incorporated Gorham Dba | Smithfield | RI | — | ◇ UNVERIFIED |
| LGLibbey Glass INC | Industry | CA | — | ◇ UNVERIFIED |
| LGLibbey Glass INC. | Toledo | OH | — | ◇ UNVERIFIED |
| LGLibbey Glass, INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| LRLight Reign Artisan Co. LLC | Cleveland | OH | — | ◇ UNVERIFIED |
| LGLillie Glassblowers, INC. | Smyrna | GA | — | ◇ UNVERIFIED |
| LGLilli Glassblowers, INC. | Smyrna | GA | — | ◇ UNVERIFIED |
| LALotton Art Glass | Crete | IL | — | ◇ UNVERIFIED |
| LALuke Adams Glass INC. | Norwood | MA | — | ◇ UNVERIFIED |
| MGMachined Glass Specialists, INC. | Springboro | OH | — | ◇ UNVERIFIED |
| MGMack Glass LLC | Champaign | IL | — | ◇ UNVERIFIED |
| MUMafic USA LLC ** Inactive ** | Shelby | NC | — | ◇ UNVERIFIED |
| MCMasterpiece Crystal | Jane Lew | WV | — | ◇ UNVERIFIED |
| MRMaterials Research Group, LLC | Beaufort | SC | — | ◇ UNVERIFIED |
| MMMatson Mfg CO INC | Long Island City | NY | — | ◇ UNVERIFIED |
| MSMfg Southeast | Opp | AL | — | ◇ UNVERIFIED |
| MCMichael Cohn | Richmond | CA | — | ◇ UNVERIFIED |
| MSMkrtich Sargsyan | North Hollywood | CA | — | ◇ UNVERIFIED |
| MFMoffitt Family Candle Glass Artist | Osage Beach | MO | — | ◇ UNVERIFIED |
 Momentive Performance Materials Quartz, INC. | Richmond Heights | OH | — | ◇ UNVERIFIED |
| MGMosser Glass | Cambridge | OH | — | ◇ UNVERIFIED |
| NSNational Scientific Dropper Industries, INC. | Newfield | NJ | — | ◇ UNVERIFIED |
| NGNavcour Glassware Llc | Lorain | OH | — | ◇ UNVERIFIED |
| NSNebbie Studios, INC. | Deland | FL | — | ◇ UNVERIFIED |
| NGNulife Glass Dunkirk | Dunkirk | NY | — | ◇ UNVERIFIED |
| OGOceanside Glass & Tile | San Diego | CA | — | ◇ UNVERIFIED |
| OFOfs Fitel-sturbridge | Sturbridge | MA | — | ◇ UNVERIFIED |
| OFOfs (optical Fiber Solutions) | Sturbridge | MA | — | ◇ UNVERIFIED |
| OOpto-net | Midland Park | NJ | — | ◇ UNVERIFIED |
| OHOrbix Hot Glass | Fort Payne | AL | — | ◇ UNVERIFIED |
| OSOsram Sylvania | Ipswich | MA | — | ◇ UNVERIFIED |
| OSOsram Sylvania INC | Wellsboro | PA | — | ◇ UNVERIFIED |
| OSOsram Sylvania Precision Materials & Components | Central Falls | RI | — | ◇ UNVERIFIED |
| OSOsram Sylvania Products INC | Exeter | NH | — | ◇ UNVERIFIED |
| OSOutcast Studios, LLC | Philadelphia | PA | — | ◇ UNVERIFIED |
| OGOwens-brockway Glass Container | Tracy | CA | — | ◇ UNVERIFIED |
| PTParis Texas Plant | Paris | TX | — | ◇ UNVERIFIED |
| PWPaul Wissmach Glass Co., Inc., Paden City | Paden City | WV | — | ◇ UNVERIFIED |
| PVP-d Valmiera Glass USA CORP. | Dublin | GA | — | ◇ UNVERIFIED |
| PGPeltier Glass Site | Ottawa | IL | — | ◇ UNVERIFIED |
| PGPerfect Glass and Machinery | Brooklyn | NY | — | ◇ UNVERIFIED |
| PVPeter Vizzusi | Aptos | CA | — | ◇ UNVERIFIED |
| PLPhilips Lighting Company | Danville | KY | — | ◇ UNVERIFIED |
| PLPhilips Lighting Company | Danville | KY | — | ◇ UNVERIFIED |
| PGPhoenix Glass Center LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| PSPigma Scientific | La Mirada | CA | — | ◇ UNVERIFIED |
| PNPilkington North America INC | Versailles | KY | — | ◇ UNVERIFIED |
| PIPpg Industries Fiber Glass Products INC | Chester | SC | — | ◇ UNVERIFIED |
| PIPpg Industries Fiber Glass Products, INC. | Lexington | NC | — | ◇ UNVERIFIED |
| PCPrecision Colored Glass LLP | Portland | OR | — | ◇ UNVERIFIED |
| PIPyrotek Incorporated | Columbia City | IN | — | ◇ UNVERIFIED |
| QGQuality Glass Blowing | Sun Valley | CA | — | ◇ UNVERIFIED |
| RFRainbow Fiberglass | Chino | CA | — | ◇ UNVERIFIED |
| RAR. and H. Filter Co., INC. | Georgetown | DE | — | ◇ UNVERIFIED |
| RTRca Thompson | Circleville | OH | — | ◇ UNVERIFIED |
| RORgv Optical Images, LLC | Harlingen | TX | — | ◇ UNVERIFIED |
| RRRichann Rodeheaver, LLC | Oakland | MD | — | ◇ UNVERIFIED |
| RGRichland Glass CO INC | Vineland | NJ | — | ◇ UNVERIFIED |
| RERiver End Glass Studio, INC. | Palm Coast | FL | — | ◇ UNVERIFIED |
| RMRocky Mountain Scientific Glass Blowing | Denver | CO | — | ◇ UNVERIFIED |
| RHRon Hinkle Glass LLC | Buckhannon | WV | — | ◇ UNVERIFIED |
| SSapulpa | Sapulpa | OK | — | ◇ UNVERIFIED |
 Simon Pearce (u.s.) INC. | Quechee | VT | — | ◇ UNVERIFIED |
| SCSpang & Co/magnetics Div | Butler | PA | — | ◇ UNVERIFIED |
| SGSpecialty Glass of the Palm Beaches, INC. | West Palm Beach | FL | — | ◇ UNVERIFIED |
| SLSpeculas, L.l.c. | Brownsville | TX | — | ◇ UNVERIFIED |
| SMStrategic Materials INC | Chicago | IL | — | ◇ UNVERIFIED |
| SFSuperior Fibers Shawnee LLC | Shawnee | OH | — | ◇ UNVERIFIED |
| TCTafco Corporation | Melrose Park | IL | — | ◇ UNVERIFIED |
| TBTamara Baskin Art Glass | Nashua | NH | — | ◇ UNVERIFIED |
| TITecglass & Instruments, LLC | Marion | NY | — | ◇ UNVERIFIED |
| TITechneglas, INC. | Columbus | OH | — | ◇ UNVERIFIED |
| TITechneglas Inc/pittston | Pittston | PA | — | ◇ UNVERIFIED |
| TITechni-glass INC | Windsor | CA | — | ◇ UNVERIFIED |
| TTTervis Tumbler Company | North Venice | FL | — | ◇ UNVERIFIED |
| TEThompson Enamel INC | Bellevue | KY | — | ◇ UNVERIFIED |
| TQTosoh Quartz INC | Portland | OR | — | ◇ UNVERIFIED |
| TTTranscend Technology INC | Fremont | CA | — | ◇ UNVERIFIED |
| TSTru Simulation + Training | Goose Creek | SC | — | ◇ UNVERIFIED |
| TGTwin Glass Industries INC | Gilroy | CA | — | ◇ UNVERIFIED |
