| Cleveland-Cliffs Steel Corp /Butler Works | Butler | 987.8k |
| Conemaugh Generating Station | New Florence | 559.2k |
| Max Environmental -- Yukon Facility | Yukon | 451.9k |
| Saint Nicholas Cogeneration Project | Shenandoah | 92.5k |
| Keystone Power Plant | Shelocta | 90.7k |
| Woodgrain Inc. | Wysox | 38.0k |
| Panther Creek Power Operating Llc | Nesquehoning | 27.8k |
| Cleveland-Cliffs Plate Llc Coatesville Facility | Coatesville | 20.8k |
| Mount Carmel Cogen Facility | Marion Heights | 10.2k |
| Pixelle Specialty Solutions Llc | Spring Grove | 7.8k |
| Standard Steel Llc | Burnham | 4.0k |
| Uss Mon Valley Works - Edgar Thomson Plant | Braddock | 3.6k |
| Oldcastle Infrastructure | Telford | 1.9k |
| Armstrong World Industries | Marietta | 1.2k |
| Carpenter Technology Corp | Reading | 1.1k |
| Ellwood Quality Steels Co | New Castle | 1.0k |
| Cleveland-Cliffs Steelton Llc | Steelton | 827 |
| Pennsylvania Transformer Technology Llc | Canonsburg | 777 |
| Johnstown Wire Technologies Inc. | Johnstown | 750 |
| Ati Flat Rolled Products Llc-Latrobe Plant | Latrobe | 741 |
| Ati Flat Rolled Products Holdings Llc | Brackenridge | 553 |
| Allegheny & Tsingshan Stainless Llc | Midland | 484 |
| Latrobe Specialty Metals | Latrobe | 473 |
| Asc Engineered Solutions - Fka Anvil International | Columbia | 398 |
| Veka Inc | Fombell | 373 |
| Colver Green Energy | Colver | 312 |
| Befesa Zinc Us Inc. | Palmerton | 300 |
| Tenaris Koppel | Koppel | 282 |
| Mcconway & Torley Llc Plt 1801 | Pittsburgh | 275 |
| Uss Mon Valley Works - Irvin Plant | West Mifflin | 194 |
| Tms International Llc/New Castle Plt | New Castle | 193 |
| Electralloy | Oil City | 161 |
| Tms International Llc | Braddock | 159 |
| Reading Alloys Llc | Robesonia | 158 |
| Global Advanced Metals Usa | Boyertown | 148 |
| Harsco Metals - Koppel | Koppel | 133 |
| North American Hoganas | Hollsopple | 127 |
| Ebensburg Power Co | Ebensburg | 97 |
| Harsco Metals - Butler | Butler | 96 |
| Greenville Metals Inc | Transfer | 93 |
| Seward Power Plant | New Florence | 84 |
| Lehigh Specialty Melting Inc | Latrobe | 84 |
| Grove U.s. Llc | Shady Grove | 78 |
| Buzzi Unicem Stockertown Plant | Stockertown | 77 |
| Ati Flat Rolled Products Holdings Llc | Vandergrift | 64 |
| Hanwha Philly Shipyard Inc | Philadelphia | 63 |
| Playworld Inc | Lewisburg | 53 |
| Jessop Steel Llc | Washington | 48 |
| Volvo Construction Equipment Na Llc Shippensburg | Shippensburg | 43 |
| Scrubgrass Generating Plant | Kennerdell | 42 |
| Holcim (Us) Inc. - Whitehall Plant | Whitehall | 31 |
| Prime Metals Acquisitions Llc | Homer City | 19 |
| Gilberton Power Co | Frackville | 16 |
| Rausch Creek Generation Llc | Tremont | 15 |
| Hoeganaes Corp | Watsontown | 15 |
| Keystone Powdered Metal Co | Saint Marys | 14 |
| Borchers Americas Inc. | Franklin | 14 |
| General Dynamics Ots (Wilkes-Barre) Llc | Wilkes Barre | 10 |
| Heidelberg Materials Us Cement Llc - Evansville | Fleetwood | 6 |
| Wenger Feeds Llc-Muncy (F/K/A Wenger Feed Mill Inc) | Muncy | 6 |
| Stein Llc | Coatesville | 6 |
| Global Tungsten & Powders Llc | Towanda | 5 |
| Intermetro Industries Corp | Wilkes-Barre | 5 |
| Wenger Feeds Llc-Rheems (F/K/A Wenger Feed Mill Inc) | Elizabethtown | 5 |
| Wenger Feeds Llc-Hempfield (F/K/A Wenger Feed Mill Inc) | Lancaster | 3 |
| Wenger Feeds Llc-Spring Glen (F/K/A Wenger Feed Mill Inc) | Spring Glen | 3 |
| Esab Group Inc. | Hanover | 2 |
| Keystone Powdered Metal Co | Lewis Run | 2 |
| Oldcastle Precast Inc | Croydon | 2 |
| General Dynamics Ots (Wilkes-Barre) Llc - Hanover Facility | Wilkes Barre | 2 |
| Wenger Feeds Llc-Shippensburg (F/K/A Wenger's Feed Mill In | Shippensburg | 2 |
| Sharon Coating Llc | Sharon | 1 |
| Wenger Feeds Llc-Mount Joy (F/K/A Wenger's Feed Mill Inc) | Mount Joy | 0 |
| Mm Metals Usa Llc | Fairless Hills | 0 |
| Ati Precision Finishing Llc - Zelienople | Zelienople | 0 |
| Stoelzle Glass | Monaca | 0 |
| Ati Precision Finishing Llc - Rochester Facility | Rochester | 0 |
| X-Mark/Belden | Washington | 0 |
| Cmc Impact Metals | Chicora | 0 |
| Novae Llc - Cam Superline | Waynesboro | 0 |
| Nestle Purina Petcare Co | Mechanicsburg | 0 |
| Adm Animal Nutrition Inc | Camp Hill | 0 |
| Envirite Of Pennsylvania Inc | York | 0 |
| Mcavoy Vitirfied Brick Co. | Phoenixville | 0 |
| Penn Color Inc. | Hatfield | 0 |
| Allegheny Petroleum Products Co | Wilmerding | 0 |
| Jr Peters Inc | Allentown | 0 |
| Miller Chemical & Fertilizer Llc | Hanover | 0 |
| Cargill Animal Nutrition | Chambersburg | 0 |
| Tenaris Ambridge | Ambridge | 0 |
| Beaver Falls Tubular Products Llc | Beaver Falls | 0 |
| Anker Industries | Turtle Creek | 0 |
| Opta - Myoma | Mars | 0 |
| Alliance Tubular Holdings Llc | Darlington | 0 |
| Zekelman Industries, Sharon Tube Division-Church St | Farrell | 0 |
| Zekelman Industries Co Dba Wheatland Tube Co-Council | Wheatland | 0 |
| Cheswick Plant Environmental Redevelopment Group Llc | Springdale | 0 |
| Sherwin-Williams Co | Pittsburgh | 0 |
| Glen-Gery Corp | Summerville | 0 |
| Metaldyne Sintered Components Ridgway | Ridgway | 0 |