| M & W Drilling, LLC | Knoxville | TN | Subcontractor |
| MWH Constructors Inc. | Broomfield | CO | Subcontractor |
| Myers Well & Pump LLC | Flagstaff | AZ | $0 |
| Nail And Sons Well Drilling LLC | Grangeville | ID | $0 |
| National Pipeline Contractors, LLC | Henderson | NV | Subcontractor |
| National Plant Services, Inc. | Long Beach | CA | Subcontractor |
| NCMC LLC | Baton Rouge | LA | Subcontractor |
| Neal's Construction, L.L.C | Stockton | MO | $0 |
| Necaise Brothers Construction Co. Inc. | Gulfport | MS | $0 |
| Nicholas Construction, Inc. | Shafter | CA | Subcontractor |
| Nijosk, Inc. | Omaha | NE | $0 |
| Nine Point Eight Capital LLC | Sedalia | CO | Subcontractor |
| Nogama Construction Corp. | Guaynabo | PR | $0 |
| Nor Cal Pipeline Services | Roseville | CA | Subcontractor |
| North American Construction Company, Inc. | Florence | SC | $0 |
| North Florida Construction, Inc. | Clarksville | FL | $0 |
| Nowak Construction Co. Inc. | Goddard | KS | $0 |
| Oberstar Inc. | Marquette | MI | $0 |
| Oceanic Companies Inc. | Kapolei | HI | Subcontractor |
| O'connell Drilling & Supply LLC | Brewster | WA | $0 |
| Ohno Construction Co. | Seattle | WA | $0 |
| Olson Brothers Excavating Inc. | Puyallup | WA | $0 |
| Orton John Excavating Inc. | Cedar City | UT | $0 |
| Pacific Excavation Inc. | Eugene | OR | $0 |
| Pacific Hydrotech Corporation | Perris | CA | $0 |
| Palmer West Associates Inc. | Wall Township | NJ | Subcontractor |
| Pamar Enterprises, Inc. | New Haven | MI | $0 |
| Paramount Construction LLC | Newington | CT | $0 |
| Parpal JV | Carlsbad | NM | Subcontractor |
| Paso Robles Tank, Inc. | Paso Robles | CA | Subcontractor |
| Paul Smithey Construction Company, Inc. | Tupelo | MS | $0 |
| PC Construction Company | South Burlington | VT | $0 |
| Pedal Valves Inc. | Luling | LA | $0 |
| Peirce Construction Company, Inc. | Marshall | VA | $0 |
| Penro Construction Co. Inc. | Pender | NE | $0 |
| Penta Corp. | Moultonborough | NH | $0 |
| Performance Pipelining Inc. | Ottawa | IL | $0 |
| Performance Plumbing & Mechanical, Inc. | Vista | CA | $0 |
| Perma Corp. | Columbus | MS | $0 |
| Peterson Drilling Inc. | Kearney | NE | Subcontractor |
| P Gioioso & Sons, Inc. | Hyde Park | MA | $0 |
| Phase Line Enterprises LLC | Smithfield | VA | Subcontractor |
| Pim Corporation | Middlesex | NJ | $0 |
| Pioneer Construction Co. Inc. | Honesdale | PA | $0 |
| Pipe-eye Sewer Services Inc. | Bradford | PA | $0 |
| Pipe Of Washington, Inc. | Pasco | WA | $0 |
| Pivetta Brothers Construction Inc. | Sumner | WA | Subcontractor |
| Potter Construction, LLC | Guyton | GA | Subcontractor |
| Precision Directional Boring, Inc. | Templeton | CA | Subcontractor |
| Preferred Drilling Solutions, Inc. | Pinellas Park | FL | Subcontractor |
| Preston Pipelines Infrastructure LLC | Milpitas | CA | Subcontractor |
| Price Civil Services Inc. | Vance | AL | $0 |
| Prime Construction Group, Inc. | Orlando | FL | $0 |
| Prince Utility, LLC | Tullahoma | TN | $0 |
| Prism Contractors & Engineers, Inc. | Williamsburg | VA | Subcontractor |
| Procoat Inc. | Winston Salem | NC | Subcontractor |
| Progressive Contracting Inc. | Saint George | UT | $0 |
| Psi Pumping Solutions Inc. | York Springs | PA | $0 |
| Pulley Construction Inc. | Benton | LA | Subcontractor |
| Push, Inc. | Rice Lake | WI | $0 |
| Raab Well Drilling Inc. | Perkasie | PA | Subcontractor |
| Rangeline Tapping Services Inc. | West Palm Beach | FL | Subcontractor |
| R. Baker Inc. | Oceano | CA | $0 |
| Rbis LLC | Texarkana | TX | $0 |
| Rdje Inc. | Newnan | GA | Subcontractor |
| Reams Construction Co. | Naturita | CO | $0 |
| Redford Construction, Inc. | Pleasant Hill | MO | Subcontractor |
| Remcon Inc. | Kennewick | WA | $0 |
| Reva Construction Corp. | Jayuya | PR | $0 |
| Reviera Enterprises Inc. | District Heights | MD | $0 |
| Reycon Construction Solutions, L.P. | El Paso | TX | Subcontractor |
| Reynolds Construction, LLC | Orleans | IN | $0 |
| R.h. Moore Company, Inc. | Murrells Inlet | SC | $0 |
| Rice Lake West, Inc. | Golden | CO | $0 |
| Richardson & Dunn Inc. | Bellville | TX | Subcontractor |
| Ricky Rich Construction Company, Inc. | Blairsville | GA | $0 |
| Rising Sun Inc. | Marshall | VA | $0 |
| R. L. Jones LP | San Antonio | TX | Subcontractor |
| R.l. Vuckson Excavating, Inc. | Salem | IN | $0 |
| Robinson & Sons Construction Services Inc. | Haleyville | AL | $0 |
| Rodarte Construction, Inc. | Auburn | WA | $0 |
| Ross Contracting, Inc. | Mount Airy | MD | $0 |
| Ruby-collins, Inc. | Smyrna | GA | $0 |
| Rutjens Construction Inc. | Tilden | NE | $0 |
| Ruts Construction LLC | Haslet | TX | Subcontractor |
| Ryburn Construction Solutions Inc. | Anadarko | OK | $0 |
| Rylee Contracting, Inc. | Alexandria | LA | $0 |
| Santos Excavating Inc. | Chico | CA | Subcontractor |
| Scafar Contracting, Inc. | Cedar Knolls | NJ | $0 |
| Schneider Equipment, Inc. | Saint Paul | OR | Subcontractor |
| Sci Infrastructure, L.L.C. | Seatac | WA | Subcontractor |
| Scott And Ritter, Inc. | Bowling Green | KY | $0 |
| S. C. Valley Engineering, Inc. | El Cajon | CA | Subcontractor |
| SCW Contracting Corporation | Fallbrook | CA | Subcontractor |
| Sellin Brothers Inc. | Hawley | MN | $0 |
| SGS Contracting Services, Inc. | High Springs | FL | Subcontractor |
| Shady Grove Construction, LLC | Irmo | SC | $0 |
| Sharboneau & Sons Inc. | Lincoln | MI | $0 |
| Shasta Services, Inc. | Mount Shasta | CA | $0 |
| Shearer & Associates, Inc. | Battle Ground | WA | Subcontractor |
