| Savannah River Mission Completion, LLC | Aiken | SC | $4.5B |
| United Cleanup Oak Ridge LLC | Oak Ridge | TN | $2.54B |
| Aptim Federal Services, LLC | Baton Rouge | LA | $1.67B |
| Idaho Environmental Coalition LLC | Tullahoma | TN | $1.66B |
| Ea Engineering, Science, And Technology, Inc. PBC | Hunt Valley | MD | $1.01B |
| Sevenson Environmental Services, Inc. | Niagara Falls | NY | $988M |
| Hydrogeologic, Inc. | Reston | VA | $844M |
| Savannah River Remediation LLC | Aiken | SC | $822M |
| Paragon Professional Services LLC | Anchorage | AK | $777M |
| Rsi Entech, LLC | Oak Ridge | TN | $616M |
| Ucor LLC | Oak Ridge | TN | $596M |
| North Wind Portage, Inc. | Idaho Falls | ID | $591M |
| Environmental Restoration LLC | Fenton | MO | $571M |
| Hanford Laboratory Management And Integration LLC | Richland | WA | $550M |
| Navarro Research And Engineering, Inc. | Oak Ridge | TN | $410M |
| Southern Ohio Cleanup Company LLC | Aiken | SC | $406M |
| CH2M Hill BWXT West Valley, LLC | West Valley | NY | $397M |
| HDR Environmental, Operations And Construction, Inc. | Englewood | CO | $333M |
| Bhate Environmental Associates, Inc. | Birmingham | AL | $300M |
| Dawson Solutions, Inc. | Huntsville | AL | $298M |
| Energy Technology Alliance LLC | Bend | OR | $277M |
| Environmental Quality Management, Inc. | Cincinnati | OH | $276M |
| Brice Engineering, LLC | Anchorage | AK | $274M |
| Cape Environmental Management Inc. | Norcross | GA | $258M |
| Sustainment & Restoration Services, LLC | Milwaukee | WI | $223M |
| Kemron/arrowhead JV, LLC | Atlanta | GA | $210M |
| Tidewater, Inc. | Elkridge | MD | $194M |
| Kemron Environmental Services, Inc. | Atlanta | GA | $171M |
| C M C, Inc. | Nicholasville | KY | $139M |
| West Valley Cleanup Alliance, LLC | West Valley | NY | $131M |
| Aptim-amentum Alaska Decommissioning LLC | Baton Rouge | LA | $127M |
| Enterprise Technical Assistance Services Inc. | Knoxville | TN | $117M |
| Ecc Environmental LLC | Burlingame | CA | $112M |
| Fpm-aecom JV1 | Oneida | NY | $111M |
| Aerostar Environmental And Construction LLC | Knoxville | TN | $109M |
| Koman Government Solutions LLC | Marlborough | MA | $109M |
| FPM Remediations, Inc. | Oneida | NY | $101M |
| Insight Environmental Engineering & Construction, Inc. | Brea | CA | $99M |
| USA Environmental, Inc. | Oldsmar | FL | $98.5M |
| Bay West LLC | Saint Paul | MN | $96.2M |
| The Source Group, Inc. | Pleasant Hill | CA | $94.1M |
| Bristol Environmental Solutions LLC | Anchorage | AK | $92.4M |
| North Wind Site Services, LLC | Idaho Falls | ID | $88.8M |
| Sevenson-usa Environmental Joint Venture II | Niagara Falls | NY | $87.7M |
| Oneida Total Integrated Enterprises LLC | Milwaukee | WI | $85.8M |
| Tehama Technical Services, LLC | Kansas City | MO | $84.4M |
| Central Environmental Inc. | Anchorage | AK | $82M |
| Eqm Services, LLC | Cincinnati | OH | $81.8M |
| Enviro-fix Solutions LLC | Burlingame | CA | $78.2M |
| Amentum Environment & Energy, Inc. | Aiken | SC | $77.8M |
| Nuclear Ship Support Services LLC | Seabrook | NH | $77.5M |
| Tetra Tech Ec, Inc. | Huntsville | AL | $77.2M |
| Advanced Technologies And Laboratories (atl) International, Inc. | Gaithersburg | MD | $77M |
| Eq & Ch Remediation | Cincinnati | OH | $76.8M |
| Pika International, Inc. | Stafford | TX | $76.5M |
| Aptim Aecom Decommissioning, LLC | Baton Rouge | LA | $76.3M |
| Cape-weston JV3 LLC | Norcross | GA | $73.7M |
| Nelson Environmental Remediation USA Ltd. | Normandy Park | WA | $72.6M |
| Alpha Facilities Solutions, LLC | San Antonio | TX | $66.1M |
| Professional Project Services, Inc. | Knoxville | TN | $66.1M |
| Perma-fix Environmental Services, Inc. | Atlanta | GA | $65.8M |
| Environmental, Safety & Health Consulting Services, Inc. | Houma | LA | $64.5M |
| Ie-weston Federal Services JVB LLC | West Richland | WA | $64.4M |
| Techlaw Consultants Inc. | Chantilly | VA | $64.2M |
| Agviq LLC | Virginia Beach | VA | $63.2M |
| Paragon-jacobs Joint Venture, LLC | Anchorage | AK | $58.8M |
| Brice-aecom JV1 | Anchorage | AK | $58.5M |
| HDR Aptim LLC | Englewood | CO | $57.8M |
| Engineering/remediation Resources Group, Inc. | Martinez | CA | $57.2M |
| Core Engineering & Construction, Inc. | Winter Park | FL | $57.2M |
| Nobis Engineering, Inc. | Concord | NH | $56.7M |
| Cabrera Services Inc. | East Hartford | CT | $56.1M |
| Brice Environmental Services Corporation | Anchorage | AK | $53.9M |
| Meadows CMPG, Inc. | Norfolk | VA | $53.3M |
| Cape Remediation, LLC | Norcross | GA | $51.8M |
| Arrowhead Contracting, LLC | Overland Park | KS | $51.8M |
| Noreas Environmental Services LLC | Irvine | CA | $47.3M |
| Bhate Zapata, LLC | Birmingham | AL | $47.3M |
| Seres-arcadis Sb JV, LLC | Charleston | SC | $46.1M |
| North Wind Site Services LLC | Murray | UT | $42.6M |
| Sundance Consultants, LLC | Pocatello | ID | $42.1M |
| Four Rivers Nuclear Partnership LLC | Kevil | KY | $41.6M |
| Lata-cti Environmental Services LLC | Albuquerque | NM | $40.3M |
| Silver Mountain Weston Sb JV LLC | Idaho Falls | ID | $40.2M |
| Ea-wood-1 Mp JV | Hunt Valley | MD | $39.9M |
| Och JV | Milwaukee | WI | $37.9M |
| Northwind-jacobs Joint Venture | Shelocta | PA | $37.3M |
| Aleut Remediation LLC | Oak Ridge | TN | $37.1M |
| Newport News Nuclear Bwxt-los Alamos LLC | Los Alamos | NM | $36.9M |
| Bay West-ahtna Joint Venture, LLC | Saint Paul | MN | $36.7M |
| Eastern Shawnee - Bay West JV, LLC | Overland Park | KS | $36.3M |
| Ahtna Environmental, Inc. | Anchorage | AK | $35.8M |
| Fpm-aecom JV2 | Oneida | NY | $35M |
| Renova Environmental Company | Ocean | NJ | $33.8M |
| Pika-insight JV LLC | Stafford | TX | $33.3M |
| Sevenson-usa Environmental Joint Venture | Niagara Falls | NY | $32.6M |
| Bem Systems Inc. | Madison | NJ | $32.1M |
| Environmental Chemical Corporation Italy S.R.L. | Limena | | $31.8M |
| Penns Contracting Inc. | Franklin | NJ | $31.7M |
| Prism Response, LLC | Pittsburgh | PA | $30.9M |
