| Johnson Controls, Inc. | Milwaukee | WI | $330M |
| North State Mechanical Inc. | Jacksonville | NC | $110M |
| Jett's Specialty Contracting, LLC | Paducah | KY | $99.9M |
| Blueway One JV LLC | Naperville | IL | $87.5M |
| Hampton Roads Mechanical Of Virginia, LLC | Chesapeake | VA | $79.8M |
| Mechworks Mechanical Contractors, Inc. | Morehead City | NC | $75.1M |
| Leisnoi Professional Services LLC | Kodiak | AK | $72.1M |
| Dunbar Mechanical Contractors, LLC | Bartlett | TN | $67.5M |
| R & W Construction Company | Jacksonville | NC | $65M |
| Innovative Support Solutions, Inc. | Elmhurst | IL | $60.6M |
| Cherokee Nation Mechanical LLC | Tulsa | OK | $59.1M |
| Lacy Mechanical Inc. | Boise | ID | $57.6M |
| General Mechanical Corporation | Jacksonville | FL | $54.4M |
| Mechanical Resources Incorporated | Newport News | VA | $50.7M |
| Able Heating & Air Conditioning, Inc. | Chula Vista | CA | $45.4M |
| Cci Mechanical, LLC | Holt | FL | $45.4M |
| Paradigm Mechanical Corp. | Santee | CA | $45.3M |
| Multi Air Services Engineers, Corp. | Rio Grande | PR | $44.8M |
| Youone Engineering Co.,ltd | Seoul | | $44.8M |
| Ryan & Associates, Inc. | Davenport | IA | $43.3M |
| Romem Aqua Systems Co. Inc. | Woodbridge | VA | $42.7M |
| TJ&B Air Conditioning And Electric, LLC | Avon Park | FL | $42.6M |
| Sankyo Reinetsu Co.,ltd. | Fukuyama | | $41.4M |
| Leisnoi Professional Services, LLC | Anchorage | AK | $39.5M |
| Southland Industries | Sterling | VA | $38.3M |
| Front Range Construction Inc. | Colorado Springs | CO | $37.2M |
| Reagent World, Inc. | Irvine | CA | $35.1M |
| Four Winds Mechanical Htc/ac Inc. | Albuquerque | NM | $33.4M |
| Duwright Construction Inc. | San Diego | CA | $31.9M |
| Phillips C&C LLC | Brightwood | VA | $28.4M |
| Ready Services, LLC | Tulsa | OK | $28.1M |
| Brothers Mechanical Services LLC | Manassas | VA | $27.7M |
| Greenworx Inc. | Long Branch | NJ | $26.7M |
| Midlands Mechanical, Inc. | Omaha | NE | $26.6M |
| Public Works Contractor Inc. | El Cajon | CA | $25.8M |
| Ses Technologies LLCAnchorage, AK · UEI DDFBDLJB2PJ5 | Anchorage | AK | $25.2M |
| Protec Facility Solutions GMBH | Wald-michelbach | | $25M |
| Caldaia Controls LLC | Cape Coral | FL | $24.1M |
| Precision Mechanical Inc. | Cocoa | FL | $23.9M |
| Astro Mechanical Contractors Inc. | El Cajon | CA | $22.3M |
| Recon Construction Specialties LLC | Villa Ridge | MO | $22M |
| Choice Sheetmetal LLC | Mililani | HI | $21.3M |
| Refcon Services Inc. | Chesapeake | VA | $20.6M |
| Johnson Controls, K.k. | Shibuya-ku | | $19.4M |
| Kisby-lees Mechanical LLC | Atlantic City | NJ | $19.3M |
| Davcon Inc. | Virginia Beach | VA | $19.3M |
| Mesa Energy Systems, Inc. | Irvine | CA | $19.2M |
| Prime Mechanical Of Wisconsin LLC | Poynette | WI | $18.9M |
| Blue Mountain Mechanical, LLC | Olympia | WA | $18.2M |
| Rk Industries Group, Inc. | La Habra | CA | $18.1M |
| Pacific Federal Solutions, LLC | Honolulu | HI | $17.8M |
| Performanceepc-greenland JV LLC | Independence | OH | $17.5M |
| Ses Technologies LLCKnoxville, TN · UEI NSNPQQUCCPJ8 | Knoxville | TN | $17M |
| Ettm JV LLC | Lorton | VA | $16.4M |
| DJ'S Mechanical, Inc. | Millstone Township | NJ | $16.3M |
| The Plumbing Shop, Inc. | Austell | GA | $16.1M |
| Sh Mechanical Inc. | Suisun City | CA | $14.7M |
| General And Mechanical Services, LLC | Annapolis | MD | $13.7M |
| Apex Mechanical LLC | Battle Ground | WA | $13.6M |
| Micron Air & Mechanical Solutions Inc. | Lexington | KY | $13.2M |
| Chappelle Mechanical Services LLC | Lorton | VA | $13M |
| American Combustion Industries Of Delaware, Inc. | Glenn Dale | MD | $12.8M |
| Eacm Corp. | Eatontown | NJ | $12.5M |
| Core Mechanical, Inc. | Pennsauken | NJ | $12.1M |
| Arabi Company WLL | Kuwait | | $12.1M |
| Advantage Mechanical-refrigeration, Inc. | Cedar Springs | MI | $12.1M |
| R.l. Hueston, LLC | Holland | OH | $12M |
| New Techno Team LLC | Wesley Chapel | FL | $11.7M |
| Alaska Boiler & Burner LLC | Anchorage | AK | $11.6M |
| S. M. Lawrence Company, Inc. | Nashville | TN | $11.5M |
| Boland Trane Services Inc. | Gaithersburg | MD | $11.1M |
| Capital Colors, LLC | Silver Spring | MD | $10.9M |
| Del Sur Services, Inc. | Punta Gorda | FL | $10.7M |
| Carrier Corporation | Palm Beach Gardens | FL | $10.6M |
| Results Sales & Service, L.L.C. | Clearwater | FL | $10.5M |
| Michael Kost | Bronx | NY | $10.2M |
| Narito Sheetmetal & Mechanical Corporation | Waipahu | HI | $10.1M |
| Manageaire LLC | Silver Spring | MD | $10M |
| Davinroy Mechanical Contractor, Inc. | Belleville | IL | $10M |
| Valley Mechanical Inc. | Menominee | MI | $9.85M |
| Chesapeake Marine Refrigeration Corp. | Norfolk | VA | $9.77M |
| T & D Mechanical, Inc. | Columbus | GA | $9.52M |
| Alabama Controls, Inc. | Hoover | AL | $9.3M |
| Metropolitan Air Conditioning Service Co. | Oklahoma City | OK | $9.27M |
| Johnson Controls Building Solutions, LLC | Milwaukee | WI | $8.91M |
| All State Construction Inc. | Farmington | CT | $8.9M |
| C.R.W. Mechanical, Inc. | Lanham | MD | $8.72M |
| Del Sur Sdac JV, LLC | Punta Gorda | FL | $8.54M |
| Junction Incorporated | Norwood | MA | $8.5M |
| The C.d. Whitfield Co. LLC | Cleveland | OH | $7.88M |
| Manunoa, LLC | La Plata | MD | $7.7M |
| Maga Mechanical Contractors, Inc. | Prince Frederick | MD | $7.67M |
| Ost Services, LLC | Tampa | FL | $7.43M |
| National Air Duct Maintenance Corp. | Chicago | IL | $7.4M |
| S E C Enterprises LLC | Conway | SC | $7.35M |
| Acco Engineered Systems, Inc. | Pasadena | CA | $7.32M |
| Cooper Mechanical Inc. | San Diego | CA | $7.23M |
| Santes Uluslararasi Muhendislik Sanayi Ve Ticaret Limited Sirketi | Istanbul | | $7.18M |
| Isonic Corp. | Juncos | PR | $7.17M |
| Damuth Services Inc. | Chesapeake | VA | $7.12M |
