| AAerofin | Lynchburg | VA | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| ABAllegheny Bradford CORP | Lewis Run | PA | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
American Exchanger Services, INC. | Hartford | WI | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| AOA O Smith Water Products Company | Mcbee | SC | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| AHApi Heat Transfer | Iron Ridge | WI | Fabricated Metal Product Manufacturing332310 | 1-19 | ◐ LIKELY ACTIVE |
| AAAxh Air Coolers | Claremore | OK | Fabricated Metal Product Manufacturing332410 | 500+ | ◐ LIKELY ACTIVE |
| BTBwx Technologies INC - R&d Closed | Lynchburg | VA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| CBCannon Boiler Works | New Kensington | PA | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| CIChart INC | Ball Ground | GA | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| CIChart INC | Mccarran | NV | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| CBChattanooga Boiler & Tank CO. | Chattanooga | TN | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| CCColmac Coil Midwest | Paxton | IL | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| CPCooling Products INC | Broken Arrow | OK | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| DPDiamond Power International INC | Lancaster | OH | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| EEEnergy Exchanger CO | Tulsa | OK | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| GPGe Power Vernova | Erlanger | KY | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| KCKoax CORP | Oklahoma City | OK | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| LRLam Research Tualatin Campus | Tualatin | OR | Fabricated Metal Product Manufacturing332410 | 500+ | ◐ LIKELY ACTIVE |
| MUMersen USA Ace CORP | Salem | VA | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| NBNationwide Boiler INC | Fremont | CA | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| NBNebraska Boiler | Lincoln | NE | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| NNobelclad | Mount Braddock | PA | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
Riggins Company, L.c. | Hampton | VA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| TEThermally Engineered Manufactured Products, INC | Gardena | CA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| TTThermal Transfer CORP | Duquesne | PA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| UBUS Boiler INC | Lancaster | PA | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| WIWagstaff INC | Hebron | KY | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |
| YTYoung Touchstone, Subside. of Wabtec Cor | Lexington | TN | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| ACAdm CO | Decatur | IL | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| BABabcock and Wilcox CO * | Barberton | OH | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| LLLochinvar LLC | Lebanon | TN | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| LILytron INC | Woburn | MA | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| TITaco INC | Fall River | MA | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| TPTurbotec Products, INC. | Newton | NC | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| YTYoung Touchstone | Jackson | TN | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
Chemted LLC | Rio Vista | TX | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
Diversified Heat Transfer, INC | Towaco | NJ | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| FCFabwell CORP | Tulsa | OK | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
Kairos Power LLC | Alameda | CA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
Mercer Fabrication LLC | Ewing | NJ | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
Noren Products INC | Taylor | TX | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
Thermal Products, INC. | Clifton Park | NY | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| HIHayden Industrial Products | San Bernardino | CA | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| AFAddison Fabricators, INC | Addison | AL | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| AOAerotest Operations, INC. | San Ramon | CA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| ACAir Cure Technologie | Saint Gabriel | LA | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| ANAKG North American Operations Inc. | Mebane | NC | Fabricated Metal Product Manufacturing332410 | 100-499 | ◐ LIKELY ACTIVE |
| ALAlfa Laval | Richmond | VA | Fabricated Metal Product Manufacturing332313 | 500+ | ◐ LIKELY ACTIVE |
| ALAlfa Laval INC | Greenwood | IN | Fabricated Metal Product Manufacturing332313 | — | ◐ LIKELY ACTIVE |
| ABAllegheny Bradford Corporation VH | Lewis Run | PA | Fabricated Metal Product Manufacturing332410 | 20-99 | ◐ LIKELY ACTIVE |