| OPOldcastle Precast INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| OPOldcastle Precast Pipe | Folsom | NJ | — | ◇ UNVERIFIED |
| OGOld Guard Industrial Group, LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| OPOlsen Pavingstone INC | San Juan Capistrano | CA | — | ◇ UNVERIFIED |
| OPOlympian Precast INC | Redmond | WA | — | ◇ UNVERIFIED |
| OMOlympic Metal Cutting | Montebello | CA | — | ◇ UNVERIFIED |
| OPOmni Products, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| OSOps Sales Company | Birmingham | AL | — | ◇ UNVERIFIED |
| OUOpta USA Inc/affival INC | New Kensington | PA | — | ◇ UNVERIFIED |
| OPOrange Pavers LLC | Stroudsburg | PA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Banning | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Riverside | CA | — | ◇ UNVERIFIED |
| OBOrco Block CO INC | Stanton | CA | — | ◇ UNVERIFIED |
| OBOrco Block & Hardscape | Oceanside | CA | — | ◇ UNVERIFIED |
| OBOrco Block & Hardscape | Riverside | CA | — | ◇ UNVERIFIED |
| ODOre Design North Salt Lake Assembly Facility | North Salt Lake | UT | — | ◇ UNVERIFIED |
| ODOre Designs INC | Woods Cross | UT | — | ◇ UNVERIFIED |
| OBOregon Block and Paver Manufacturing INC | Prineville | OR | — | ◇ UNVERIFIED |
| OCOrnamental Concrete INC | Arvada | CO | — | ◇ UNVERIFIED |
| OLO.T.S. Logistics, LLC | Brownstown | IL | — | ◇ UNVERIFIED |
| OROttawa River Steel | Detroit | MI | — | ◇ UNVERIFIED |
| OSOutokumpu Stainless USA LLC | Haverhill | MA | — | ◇ UNVERIFIED |
| PIPacific Interlock Paver INC | Hollister | CA | — | ◇ UNVERIFIED |
| PSPacific Structures | Riverside | CA | — | ◇ UNVERIFIED |
| PCParamit Corporation | Morgan Hill | CA | — | ◇ UNVERIFIED |
| PTPatterson Tubular Services | Liberty | TX | — | ◇ UNVERIFIED |
| PPPaveloc Plus LLC | Rosenberg | TX | — | ◇ UNVERIFIED |
| PLPavestone - La Feria | La Feria | TX | — | ◇ UNVERIFIED |
| PLPavestone LLC | Middleboro | MA | — | ◇ UNVERIFIED |
| PRPavestone - Richmond, Va Plant [newline] | Doswell | VA | — | ◇ UNVERIFIED |
| PPavestown | Pedricktown | NJ | — | ◇ UNVERIFIED |
| PCPayless Concrete Products, INC. | Iola | KS | — | ◇ UNVERIFIED |
| PCPbm Concrete INC | Rochelle | IL | — | ◇ UNVERIFIED |
| PSPennsylvania Sintered Metals INC | Emporium | PA | — | ◇ UNVERIFIED |
| PBPensacola Block USA | Pensacola | FL | — | ◇ UNVERIFIED |
| PBPetersburg Block INC | Petersburg | WV | — | ◇ UNVERIFIED |
| PUPetmin USA Incorporated (0204012023) | Ashtabula | OH | — | ◇ UNVERIFIED |
| PCPhillips Concrete INC | Bridgewater Twp | NJ | — | ◇ UNVERIFIED |
| POPhlebotomists on Wheels | Pompano Beach | FL | — | ◇ UNVERIFIED |
| PBPhoenix Block CO. LLC | Montgomery | AL | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC Georgetown | Georgetown | SC | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC Pig Iron Caster | Gary | IN | — | ◇ UNVERIFIED |
| PSPhoenix Svc LLC - Johnstown Slag Prep Facility | Johnstown | PA | — | ◇ UNVERIFIED |
| PCPiedmont Concrete Products Incorporated Duncan | Duncan | SC | — | ◇ UNVERIFIED |
| PDPinnacle Design/build Group INC | Corvallis | OR | — | ◇ UNVERIFIED |
| PHPinnacle Health/harrisburg Hosp | Harrisburg | PA | — | ◇ UNVERIFIED |
| PMPlasterglass Manufacturing | Omaha | NE | — | ◇ UNVERIFIED |
| PBPompano Beach Facility | Pompano Beach | FL | — | ◇ UNVERIFIED |
| PCPonce Concrete Blk 1 | Ponce | PR | — | ◇ UNVERIFIED |
| PIPre-cal INC Dba Ginger Precast Designs | Riverside | CA | — | ◇ UNVERIFIED |
| PMPrecision Machine Shop Inc | Houston | TX | — | ◇ UNVERIFIED |
| PPPrecision Precast INC | Pittsfield | MA | — | ◇ UNVERIFIED |
| PSPrecision Specialty Metals INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| PTPrecision Tooling Technologies, LLC | Zeeland | MI | — | ◇ UNVERIFIED |
 Prentex Alloy Fabricators, Incorporated | Dallas | TX | — | ◇ UNVERIFIED |
| PDProtech Design | Anaheim | CA | — | ◇ UNVERIFIED |
| PFP.w. Feenstra - Port. Conc. Batch Plnt 3 | Queen Creek | AZ | — | ◇ UNVERIFIED |
| PCPyramid Construction and Aggregates | Imperial County | CA | — | ◇ UNVERIFIED |
| PPPyramid Pavers, LLC | Englewood | FL | — | ◇ UNVERIFIED |
| PMPyron Metal | Niagara Falls | NY | — | ◇ UNVERIFIED |
| QBQuality Block & Supply | Mulberry | FL | — | ◇ UNVERIFIED |
| QQQuick Quack Car Wash Coe | Roseville | CA | — | ◇ UNVERIFIED |
| QCQuikrete Companies LLC Dba Quikrete | San Diego | CA | — | ◇ UNVERIFIED |
| QLQuikrete - La Feria | La Feria | TX | — | ◇ UNVERIFIED |
| QOQuikrete of Ca Dba Quikrete City of Industry | Industry | CA | — | ◇ UNVERIFIED |
| RBRancho Block Company | San Bernardino | CA | — | ◇ UNVERIFIED |
| RBRcp Block & Brick INC | Santee | CA | — | ◇ UNVERIFIED |
| RBRcp Block & Brick INC | San Diego | CA | — | ◇ UNVERIFIED |
| RBRcp Block & Brick INC. | Lemon Grove | CA | — | ◇ UNVERIFIED |
| RMReady Mix USA Llc- Jasper Block Plant | Jasper | AL | — | ◇ UNVERIFIED |
| RMReady Mix Usa, LLC - Sylacauga Block | Sylacauga | AL | — | ◇ UNVERIFIED |
| RSRebar Spacer Block Company INC | Alviso | CA | — | ◇ UNVERIFIED |
| RFRebellion Fabrication LLC | Wahoo | NE | — | ◇ UNVERIFIED |
| RSRecticon/allied Steel CORP. | Parker Ford | PA | — | ◇ UNVERIFIED |
| RSRepublic Steel, Lackawanna | Blasdell | NY | — | ◇ UNVERIFIED |
| RMReserve Marine Terminal | Chicago | IL | — | ◇ UNVERIFIED |
| RFR F Herrera Concrete Construction | San Dimas | CA | — | ◇ UNVERIFIED |
| RCRiccobene Concrete Masonry and Design | Albuquerque | NM | — | ◇ UNVERIFIED |
| RBRiverview Block INC. | Berwick | PA | — | ◇ UNVERIFIED |
| RPRiw Plan of Steel, LP | Raleigh | NC | — | ◇ UNVERIFIED |
| RJR J R Drying, INC. | East Chicago | IN | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | San Diego | CA | — | ◇ UNVERIFIED |
| RRRobertsons Ready Mix | Escondido | CA | — | ◇ UNVERIFIED |
| RBRobinson Block LLC (was Colo Cncrt Mfg) | Colorado Springs | CO | — | ◇ UNVERIFIED |
| RBRobinson Brick CO | Denver | CO | — | ◇ UNVERIFIED |
| RBRobinson Brick CO | Aurora | CO | — | ◇ UNVERIFIED |
| RCRochester Concrete Products | Rochester | MN | — | ◇ UNVERIFIED |
| RCRockford Cement Products CO | Rockford | IL | — | ◇ UNVERIFIED |
| RBRocks & Blocks Landscaping & Contracting LLC | Bismarck | ND | — | ◇ UNVERIFIED |
| RLRoofblok Limited | Gardner | MA | — | ◇ UNVERIFIED |
| RCRosebud Concrete INC | Mission | SD | — | ◇ UNVERIFIED |
| RSRouge Steel CO | Dearborn | MI | — | ◇ UNVERIFIED |
| RPR P M Centerless Grinding CO | Norco | CA | — | ◇ UNVERIFIED |
| RTRr Traders & Import Export LLC | Lewis Center | OH | — | ◇ UNVERIFIED |
| RCRuby Concrete Company INC | Madisonville | KY | — | ◇ UNVERIFIED |
| RIRusselloy Iron Foundry, LLC | Coralville | IA | — | ◇ UNVERIFIED |
| SMSaldanas Masonry | Brownsville | TX | — | ◇ UNVERIFIED |
| SISamuel-whittar INC | Detroit | MI | — | ◇ UNVERIFIED |
| SCSather Construction, LLC | Boise | ID | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | — | ◇ UNVERIFIED |
