| 1 | A & C Auto Sales, Inc.Not reported | Corporation | Not reported | Not reported |
| 2 | A & L Motors, Inc.Not reported | Corporation | Not reported | Not reported |
| 3 | Ace Bumper Co., a Close CorporationNot reported | Corporation | Not reported | Not reported |
| 4 | Advertisers Postal Service, Inc.Not reported | Corporation | Not reported | Not reported |
| 5 | Aerial Ads of Pittsburgh, Inc.Not reported | Corporation | Not reported | Not reported |
| 6 | Air Lift, Inc.Not reported | Corporation | Not reported | Not reported |
| 7 | Aken Industries IncNot reported | Corporation | Not reported | Not reported |
| 8 | Al-vic All Sports Vehicles, Inc.Not reported | Corporation | Not reported | Not reported |
| 9 | Alert Security, Inc.Not reported | Corporation | Not reported | Not reported |
| 10 | Algonquin Fly-in, Inc.Not reported | Nonprofit | Not reported | Not reported |
| 11 | Aliquippa Fine Foods, Inc.Not reported | Corporation | Not reported | Not reported |
| 12 | Allegheny Aluminum Industries, Inc.Not reported | Corporation | Not reported | Not reported |
| 13 | Allegheny Car Wash CorporationNot reported | Corporation | Not reported | Not reported |
| 14 | Allegheny Drafting Service, Inc.Not reported | Corporation | Not reported | Not reported |
| 15 | Allegheny Surveying and Mapping Services, Inc.Not reported | Corporation | Not reported | Not reported |
| 16 | Allwell Building Contractors, Inc.Not reported | Corporation | Not reported | Not reported |
| 17 | Alpine Village Civic AssociationNot reported | Nonprofit | Not reported | Not reported |
| 18 | American Advertising Industries, Inc.Not reported | Corporation | Not reported | Not reported |
| 19 | American Beauty Carpets, Inc.Not reported | Corporation | Not reported | Not reported |
| 20 | American Industrial Supply Co.Not reported | Corporation | Not reported | Not reported |
| 21 | American Sports, Inc.Not reported | Corporation | Not reported | Not reported |
| 22 | Analox Instruments, Inc.Not reported | Corporation | Not reported | Not reported |
| 23 | Animal Sciences, Inc.Not reported | Corporation | Not reported | Not reported |
| 24 | The Lung Specialists, Inc.Not reported | Corporation | Not reported | Not reported |
| 25 | Automotive Instrument Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 26 | Avery Oil CompanyNot reported | Corporation | Not reported | Not reported |
| 27 | Artists Producers, Inc.Not reported | Corporation | Not reported | Not reported |
| 28 | B. B. and J., Inc.Not reported | Corporation | Not reported | Not reported |
| 29 | B C R Catering, Inc.Not reported | Corporation | Not reported | Not reported |
| 30 | Banda, James, Inc.Not reported | Corporation | Not reported | Not reported |
| 31 | Bansk CorporationNot reported | Corporation | Not reported | Not reported |
| 32 | Barefoot B. B. & Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 33 | Barlynn CorporationNot reported | Corporation | Not reported | Not reported |
| 34 | Beatty Road CorporationNot reported | Corporation | Not reported | Not reported |
| 35 | Beer Case, Inc.Not reported | Corporation | Not reported | Not reported |
| 36 | Bensil IncNot reported | Corporation | Not reported | Not reported |
| 37 | Berg Construction CorporationNot reported | Corporation | Not reported | Not reported |
| 38 | Bert Foods, Inc.Not reported | Corporation | Not reported | Not reported |
| 39 | Bertera Building Enterprises, Inc.Not reported | Corporation | Not reported | Not reported |
| 40 | Bethel United Presbyterian ChurchNot reported | Nonprofit | Not reported | Not reported |
| 41 | Betkas, Inc.Not reported | Corporation | Not reported | Not reported |
| 42 | Better Buy Drapery CompanyNot reported | Corporation | Not reported | Not reported |
| 43 | Bilmont Pools, Inc.Not reported | Corporation | Not reported | Not reported |
| 44 | Biondi Motor Company, Inc.Not reported | Corporation | Not reported | Not reported |
| 45 | Bishop Asphalt Paving Company, Inc.Not reported | Corporation | Not reported | Not reported |
| 46 | Black and Gibson, Inc.Not reported | Corporation | Not reported | Not reported |
| 47 | J.d. Blackhall Contracting CompanyNot reported | Corporation | Not reported | Not reported |
| 48 | Bob and Cathy, Inc.Not reported | Corporation | Not reported | Not reported |
| 49 | Books Etcetera, Inc.Not reported | Corporation | Not reported | Not reported |
| 50 | Bowers Publishing Company, Inc.Not reported | Corporation | Not reported | Not reported |