| APAir Products and Chemicals Inc-j.p. Stevens Piedmont Site-remediation Project | Piedmont | SC | — | ◇ UNVERIFIED |
| APAir Products Manufacturing LLC | Paramount | CA | — | ◇ UNVERIFIED |
| AHAjinomoto Health & Nutrition North America, INC. | Eddyville | IA | — | ◇ UNVERIFIED |
| ACAkcros Chemicals INC | New Brunswick | NJ | — | ◇ UNVERIFIED |
| ANAkzo Nobel Surface Chemistry LLC | Salisbury | NC | — | ◇ UNVERIFIED |
| ANAkzo Nobel Surface Chemistry LLC | Mccook | IL | — | ◇ UNVERIFIED |
 Alchem Laboratories Corporation | Alachua | FL | — | ◇ UNVERIFIED |
| ACAldrich Chemical CO INC | Milwaukee | WI | — | ◇ UNVERIFIED |
| ACAldrich Chemical CO INC | Milwaukee | WI | — | ◇ UNVERIFIED |
| AIAlexium INC | Duncan | SC | — | ◇ UNVERIFIED |
| AEAlionyx Energy Systems | Monrovia | CA | — | ◇ UNVERIFIED |
| APAli Pharmaceutical Mfg LLC | Omaha | NE | — | ◇ UNVERIFIED |
| AUAllied Universal Corporation | Fort Pierce | FL | — | ◇ UNVERIFIED |
| AIAllnex INC | North Augusta | SC | — | ◇ UNVERIFIED |
| AMAlpont Methanol | Oregon | OH | — | ◇ UNVERIFIED |
| ALAlyeschem, LLC / Alyeschem Methanol Plant | North Slope Borough | AK | — | ◇ UNVERIFIED |
| ALAlzchem LLC | Fresno | CA | — | ◇ UNVERIFIED |
| ACAmerchol CORP | Greensburg | LA | — | ◇ UNVERIFIED |
| AAAmerican Acryl | Pasadena | TX | — | ◇ UNVERIFIED |
 American Aerogel Corporation | Rochester | NY | — | ◇ UNVERIFIED |
| ACAmerican Contract Systems, INC. | Temple Terrace | FL | — | ◇ UNVERIFIED |
| AFAmerican Future Fuels Facility | Lima | OH | — | ◇ UNVERIFIED |
| ARAmerican River Nutrition LLC | Hadley | MA | — | ◇ UNVERIFIED |
| AWAmerican Warehouses, LTD. | Houston | TX | — | ◇ UNVERIFIED |
| AAminoacids.com | Roseville | MN | — | ◇ UNVERIFIED |
| ASAngers & Salinas Forwarding | Laredo | TX | — | ◇ UNVERIFIED |
| AIAnm, INC | Medford | OR | — | ◇ UNVERIFIED |
| AMApex Metal Finishing-apex Metal Finishing | Saint Louis | MO | — | ◇ UNVERIFIED |
| ARApex Resources Katy Operations | Katy | TX | — | ◇ UNVERIFIED |
| AIApollo Industries INC | Smyrna | GA | — | ◇ UNVERIFIED |
 Applied Biosystems INC | Foster City | CA | — | ◇ UNVERIFIED |
| Applied Biosystems, LLC | Foster City | CA | — | ◇ UNVERIFIED |
| ASApplied Silicone Corportation | Santa Paula | CA | — | ◇ UNVERIFIED |
| AWAptus (merged W/1250047) | Coffeyville | KS | — | ◇ UNVERIFIED |
| ACAqua Concepts INC. Dba Ag Water Chemical | La Grange | CA | — | ◇ UNVERIFIED |
| ASAquapuck Storage | Las Vegas | NV | — | ◇ UNVERIFIED |
| ASAqua Smart INC | Atlanta | GA | — | ◇ UNVERIFIED |
| ACAquasol Corporation | Rock Hill | SC | — | ◇ UNVERIFIED |
| ASAqua Solutions | Deer Park | TX | — | ◇ UNVERIFIED |
| ATAqua Tech Services, INC. | Albuquerque | NM | — | ◇ UNVERIFIED |
| ATAqua Tri | Fontana | CA | — | ◇ UNVERIFIED |
| ATAqua Tri | Ontario | CA | — | ◇ UNVERIFIED |
| ABArcanum Baytown Site | Baytown | TX | — | ◇ UNVERIFIED |
| ACArch Chemicals INC | Rochester | NY | — | ◇ UNVERIFIED |
 Archer Daniels Midland | Erlanger | KY | — | ◇ UNVERIFIED |
| Archer Daniels Midland Company | Southport | NC | — | ◇ UNVERIFIED |
| ACArco Chemical CO Turtle Bayou | Liberty | TX | — | ◇ UNVERIFIED |
| AIArnhem, Inc. | Westfield | NJ | — | ◇ UNVERIFIED |
| APArrmaz Products INC. | Soda Springs | ID | — | ◇ UNVERIFIED |
| APArtesia Ptu LLC | Artesia | NM | — | ◇ UNVERIFIED |
