| 1 | Academy Enterprises, Inc.Not reported | Corporation | Not reported | Not reported |
| 2 | Acorn Cigarette Service CoNot reported | Corporation | Not reported | Not reported |
| 3 | William J Adamson & Company IncNot reported | Corporation | Not reported | Not reported |
| 4 | George S. Aikens, Inc.Not reported | Corporation | Not reported | Not reported |
| 5 | Airline Associates IncNot reported | Corporation | Not reported | Not reported |
| 6 | Alexander Agency, Inc.Not reported | Corporation | Not reported | Not reported |
| 7 | Allegheny Block and Supply CompanyNot reported | Corporation | Not reported | Not reported |
| 8 | Allegheny Industrial Development CorporationNot reported | Nonprofit | Not reported | Not reported |
| 9 | Allegheny Northern Real Estate, Inc.Not reported | Corporation | Not reported | Not reported |
| 10 | American Air Surveys IncNot reported | Corporation | Not reported | Not reported |
| 11 | American Tubular Elevator CompanyNot reported | Corporation | Not reported | Not reported |
| 12 | Arnold-roblin CorporationNot reported | Corporation | Not reported | Not reported |
| 13 | Asmed Ruffsdale CorporationNot reported | Corporation | Not reported | Not reported |
| 14 | Associated Motor Carriers IncNot reported | Nonprofit | Not reported | Not reported |
| 15 | Ati Television Brodcasting IncNot reported | Corporation | Not reported | Not reported |
| 16 | Atlas Theatre Supply CoNot reported | Corporation | Not reported | Not reported |
| 17 | Atomic Frock IncNot reported | Corporation | Not reported | Not reported |
| 18 | Bauerstown Land Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 19 | Benson Laboratories IncNot reported | Corporation | Not reported | Not reported |
| 20 | Berthold Grigsby, Inc.Not reported | Corporation | Not reported | Not reported |
| 21 | Bessemer Stores IncNot reported | Corporation | Not reported | Not reported |
| 22 | Best Aluminum CompanyNot reported | Corporation | Not reported | Not reported |
| 23 | Beyer Chemical Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 24 | Blatchford Furniture CoNot reported | Corporation | Not reported | Not reported |
| 25 | Bloom Cigar Co IncNot reported | Corporation | Not reported | Not reported |
| 26 | The Brassert CorporationNot reported | Corporation | Not reported | Not reported |
| 27 | Brisbane CorporationNot reported | Corporation | Not reported | Not reported |
| 28 | Bullinger & Johnson, Inc.Not reported | Corporation | Not reported | Not reported |
| 29 | C & S Millwork CompanyNot reported | Corporation | Not reported | Not reported |
| 30 | Carbonic Dispenser IncNot reported | Corporation | Not reported | Not reported |
| 31 | Carbozite Protective Coatings IncNot reported | Corporation | Not reported | Not reported |
| 32 | Catholic Cultural CentreNot reported | Nonprofit | Not reported | Not reported |
| 33 | Chautauqua Foundation IncNot reported | Nonprofit | Not reported | Not reported |
| 34 | Chuckrow & Wyckoff IncNot reported | Corporation | Not reported | Not reported |
| 35 | Club Management CorporationNot reported | Corporation | Not reported | Not reported |
| 36 | Coal & Mineral Washer CorporationNot reported | Corporation | Not reported | Not reported |
| 37 | The Coast Guard League Pittsburgh Chapter #960Not reported | Nonprofit | Not reported | Not reported |
| 38 | Art R. Cohen CompanyNot reported | Corporation | Not reported | Not reported |
| 39 | Commercial Cigarette Service CoNot reported | Corporation | Not reported | Not reported |
| 40 | Commercial Contract Company of Joseph Horne Co.Not reported | Corporation | Not reported | Not reported |
| 41 | Commercial Development CompanyNot reported | Corporation | Not reported | Not reported |
| 42 | Confidential, Inc.Not reported | Corporation | Not reported | Not reported |
| 43 | The Consolidated Royalty Oil CompanyNot reported | Corporation | Not reported | Not reported |
| 44 | Continental Cars IncNot reported | Corporation | Not reported | Not reported |
| 45 | Crawford Supply Company IncNot reported | Corporation | Not reported | Not reported |
| 46 | Crest Printers, Inc.Not reported | Corporation | Not reported | Not reported |
| 47 | Crown Conditioning CorporationNot reported | Corporation | Not reported | Not reported |
| 48 | Cuda's Credit Jewelry Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 49 | The Cunningham Company, Inc.Not reported | Corporation | Not reported | Not reported |
| 50 | Curtis Aluminum Products Co.Not reported | Corporation | Not reported | Not reported |