| KMKiewit Massman Construction | North Little Rock | AR | — | ◇ UNVERIFIED |
| KPKilgore Plant | Kilgore | TX | — | ◇ UNVERIFIED |
| KIKim Iron Works INC | Fullerton | CA | — | ◇ UNVERIFIED |
| KMKincaid Manufacturing INC. | Verona | PA | — | ◇ UNVERIFIED |
| KIKingbird Industries, LLC | Salisbury | NC | — | ◇ UNVERIFIED |
| KIKing Iron Works | Burbank | CA | — | ◇ UNVERIFIED |
| KIKingspan Insulated Panels | Columbus | OH | — | ◇ UNVERIFIED |
| KVKings Valley Industries INC | Madera | CA | — | ◇ UNVERIFIED |
| KTKing Tool Company | Longview | TX | — | ◇ UNVERIFIED |
| KWKing Wire Partition | Los Angeles | CA | — | ◇ UNVERIFIED |
| KMKinksbridge Metal CO | Carrollton | GA | — | ◇ UNVERIFIED |
| KSKinsley Steel INC. | Richmond | VA | — | ◇ UNVERIFIED |
| KCKinton Carbide, INC. | Export | PA | — | ◇ UNVERIFIED |
| KCKisner Corporation | Raleigh | NC | — | ◇ UNVERIFIED |
| KFKistler Fabricating | Warren | OH | — | ◇ UNVERIFIED |
| KWKiwi's Welding & Repair, Inc. | Boise | ID | — | ◇ UNVERIFIED |
| KWKJC Welding LLC | Falcon | MO | — | ◇ UNVERIFIED |
| KJK & J Steel INC | Washington | UT | — | ◇ UNVERIFIED |
| KIKlm Iron Works INC | Brooklyn | NY | — | ◇ UNVERIFIED |
| KMK & M Rebar Inc. | Vancouver | WA | — | ◇ UNVERIFIED |
| KFKMS Fabrication LLC | Minerva | OH | — | ◇ UNVERIFIED |
| KCKnox Custom Fabrication, INC. | North Salt Lake | UT | — | ◇ UNVERIFIED |
 Knoxville Sheet Metal Works INC Dba Steel Plate Fa | Knoxville | TN | — | ◇ UNVERIFIED |
| KCKo Custom Fab Incorporated | Boring | OR | — | ◇ UNVERIFIED |
| KWKoenig Welding Services, LTD. | Wharton | TX | — | ◇ UNVERIFIED |
| KIKolemba Industries, INC. | Gallatin | TN | — | ◇ UNVERIFIED |
| KWKoski Welding INC | Baraga | MI | — | ◇ UNVERIFIED |
| KIKrech Ironworks INC | Inver Grove Heights | MN | — | ◇ UNVERIFIED |
| KIKrimes Industrial and Mechanical INC. | Ephrata | PA | — | ◇ UNVERIFIED |
| KSK & S Ironworks INC. | Wilmington | DE | — | ◇ UNVERIFIED |
| KMK&s Metals INC. | Kennett Square | PA | — | ◇ UNVERIFIED |
| KIKsq Incorporated | Winfield | KS | — | ◇ UNVERIFIED |
| KSKta Services | Hallettsville | TX | — | ◇ UNVERIFIED |
| KMKumi Manufacturing Alabama LLC | Vanport | PA | — | ◇ UNVERIFIED |
| KDKurt Damron's Undercover Motorsports, Inc. | Morriston | FL | — | ◇ UNVERIFIED |
| KMKurt Manufacturing | Lyman | NE | — | ◇ UNVERIFIED |
| KVK V Weld, INC. | Baytown | TX | — | ◇ UNVERIFIED |
| KLKwf LLC | Griswold | IA | — | ◇ UNVERIFIED |
| KFKWX Fabrication & Welding LLC | Roll | AZ | — | ◇ UNVERIFIED |
| LILabcraft, INC. | Waterville | OH | — | ◇ UNVERIFIED |
| LCLaBudde Creek Fabrication LLC | Elkhart Lake | WI | — | ◇ UNVERIFIED |
| LFLA Fence Craft Inc | Rosemead | CA | — | ◇ UNVERIFIED |
| LELafollette Enterprises INC | Turlock | CA | — | ◇ UNVERIFIED |
| LALake Area Equipment Maintenance, INC. | Lake Charles | LA | — | ◇ UNVERIFIED |
| LBLake Building Products INC | Solon | OH | — | ◇ UNVERIFIED |
| LBLake Building Products INC | Akron | OH | — | ◇ UNVERIFIED |
| LBLake Building Products, INC. | Mentor | OH | — | ◇ UNVERIFIED |
| LELake Erie Ship Repair and Fabrication, LLC. | Ashtabula | OH | — | ◇ UNVERIFIED |
| LCLakeland CO of Barron County INC | Cumberland | WI | — | ◇ UNVERIFIED |
| LSLakeside Steel & Mfg. Co. | Kenosha | WI | — | ◇ UNVERIFIED |
