| 1 | RMG Erectors & Constructors, Missoula, Mont. | 2000 | 52440 | 46085 | 14% | 8304049 | |
| 2 | Trimak Building Systems, Plant City, Fla. | 2004 | 15400 | 13300 | 16% | 2700000 | Behlen Manufacturing Co., Ceco Building Systems, Schulte Building Systems Inc., Varco Pruden Buildings |
| 3 | Fleming Steel Erectors, Tulsa, Okla. | 1946 | 14329 | 4893 | 193% | 5129134 | Butler Manufacturing, |
| 4 | Precision Erection Company, Inc., Russell Springs, Ky | 1990 | 9171 | 8844 | 8% | 1542389 | Chief Buildings, Nucor Building Systems, Star Building Systems |
| 5 | Baker Steel Erectors, LLC, Frederick, Colo. | 2013 | 8185 | 6150 | 33% | 1605200 | American Buildings |
| 6 | Bahnmiller Construction, Inc, Everett, Wash. | 2006 | 4005 | 2765 | 45% | 631594 | Ceco Building Systems, Nucor Building Systems, Star Building Systems |
| 7 | Foundation Steel, Swanton, Ohio | 2008 | 3352 | 2752 | 22% | 961300 | Kirby Building Systems |
| 8 | DD Construction, Centennial, Colo. | 2017 | 1890 | 1698 | 11% | 632586 | Butler Manufacturing |
| 9 | Maine Metal Buildings Inc., Gorham, Maine | 2016 | 1837 | 1794 | 2% | 299747 | Corle Building Systems, Metallic Building Co. |
| 10 | US Metal Builders, Inc., Pleasant Hill, Iowa | 2018 | 1400 | 1384 | 1% | 330777 | American Buildings, Varco Pruden Buildings |
| 11 | Chestnut Oak Construction, Heath, Ohio | 2016 | 1019 | 1453 | -30% | 214851 | Nucor Building Systems |
| 12 | Ultimate Steel Erection, Rexburg, Idaho | 2001 | 1006 | 1096 | -8% | 197945 | Nucor Building Systems, Star Building Systems |
| 13 | HME, INC., Topeka, Kans. | 1996 | 882 | 599 | 47% | 135948 | Butler Manufacturing |
| 14 | Epic Construction, Kieler, Wisc. | 2002 | 556 | 1204 | -54% | 131943 | Nucor Building Systems, Varco Pruden Buildings |
| 15 | Northwest Builders, Inc., Rice Lake, Wisc. | 1970 | 541 | 802 | -33% | 219504 | Butler Manufacturing, |
| 16 | Continental Divide Builders, Lawrence, Wash. | 2016 | 530 | 149 | 255% | 473356 | Butler Manufacturing |
| 17 | PATCO Construction, Inc | 1985 | 454 | 450 | 1% | 113952 | Varco Pruden Buildings |
| 18 | Lee Michael Industries, Inc. | 2005 | 408 | 26 | 1469% | 408 | Varco Pruden Buildings |
| 19 | Lefever Building Systems, Denver, Colo. | 2002 | 395 | 2664 | -85% | 235177 | Varco Pruden Buildings |
| 20 | The Collin McClanahan Company LLC, Gordonville, Mo. | 1987 | 377 | 131 | 188% | 148036 | Kirby Building Systems |




