| 1 | Aardvark, a Machine & Tool Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 2 | Abbott-whitney Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 3 | Aberdeen IncNot reported | Corporation | Not reported | Not reported |
| 4 | Adams House Dinner Theatre, Inc.Not reported | Corporation | Not reported | Not reported |
| 5 | Ron Adams, Inc.Not reported | Corporation | Not reported | Not reported |
| 6 | Air Spectacular, Inc.Not reported | Corporation | Not reported | Not reported |
| 7 | Alexander Travel, Inc.Not reported | Corporation | Not reported | Not reported |
| 8 | Alfredo Distributors, Inc.Not reported | Corporation | Not reported | Not reported |
| 9 | Alhambra Lounge, Inc.Not reported | Corporation | Not reported | Not reported |
| 10 | Alice's Tavern, Inc.Not reported | Corporation | Not reported | Not reported |
| 11 | Allegheny Air Conditioning IncNot reported | Corporation | Not reported | Not reported |
| 12 | Allegheny Battery, Inc.Not reported | Corporation | Not reported | Not reported |
| 13 | Allegheny Rowing Association of PennsylvaniaNot reported | Nonprofit | Not reported | Not reported |
| 14 | Allegheny Rubber CompanyNot reported | Corporation | Not reported | Not reported |
| 15 | Allegheny Society of Medical Specialists, Inc.Not reported | Nonprofit | Not reported | Not reported |
| 16 | Allied Constructors & Engineers IncNot reported | Corporation | Not reported | Not reported |
| 17 | American Art Records, Inc.Not reported | Corporation | Not reported | Not reported |
| 18 | American Industrial Contracting, Inc.Not reported | Corporation | Not reported | Not reported |
| 19 | American Racing Association, Inc.Not reported | Corporation | Not reported | Not reported |
| 20 | Amjon, Inc.Not reported | Corporation | Not reported | Not reported |
| 21 | Arena Parking, Inc.Not reported | Corporation | Not reported | Not reported |
| 22 | Argonne Tavern, Inc.Not reported | Corporation | Not reported | Not reported |
| 23 | Arlynn Shoe CompanyNot reported | Corporation | Not reported | Not reported |
| 24 | Arsenal Holiday Meats, Inc.Not reported | Corporation | Not reported | Not reported |
| 25 | Art's Club 77, Inc.Not reported | Corporation | Not reported | Not reported |
| 26 | Automatic Raise-a-dor CompanyNot reported | Corporation | Not reported | Not reported |
| 27 | Avery Insurance Agency, Inc.Not reported | Corporation | Not reported | Not reported |
| 28 | Associated Brokers IncNot reported | Corporation | Not reported | Not reported |
| 29 | Associated Ceramic Tile Contractors of Western PennsylvaniaNot reported | Nonprofit | Not reported | Not reported |
| 30 | Associated Properties of Pennsylvania, Inc.Not reported | Corporation | Not reported | Not reported |
| 31 | Associated Salary Evaluators IncNot reported | Corporation | Not reported | Not reported |
| 32 | Associates Litho, Inc.Not reported | Corporation | Not reported | Not reported |
| 33 | Atwood Distributors IncorporatedNot reported | Corporation | Not reported | Not reported |
| 34 | Atwood Gardens, Inc.Not reported | Corporation | Not reported | Not reported |
| 35 | Aztec Construction Inc.Not reported | Corporation | Not reported | Not reported |
| 36 | B & B Industrial Catering Service, Inc.Not reported | Corporation | Not reported | Not reported |
| 37 | B & B Lounge, Inc.Not reported | Corporation | Not reported | Not reported |
| 38 | B. G. Lounge, Inc.Not reported | Corporation | Not reported | Not reported |
| 39 | B & R Enterprises Inc.Not reported | Corporation | Not reported | Not reported |
| 40 | B S & K IncNot reported | Corporation | Not reported | Not reported |
| 41 | B. &w. Oil CompanyNot reported | Corporation | Not reported | Not reported |
| 42 | Bahamas Hotel CorporationNot reported | Corporation | Not reported | Not reported |
| 43 | Bank's Lounge, Inc.Not reported | Corporation | Not reported | Not reported |
| 44 | Bar Crescent, Inc.Not reported | Corporation | Not reported | Not reported |
| 45 | Bar-grille, Inc.Not reported | Corporation | Not reported | Not reported |
| 46 | Barb-brown's Lounge, Inc.Not reported | Corporation | Not reported | Not reported |
| 47 | The Bartenders' Social Club of PittsburghNot reported | Nonprofit | Not reported | Not reported |
| 48 | Bayer & Associates Inc.Not reported | Corporation | Not reported | Not reported |
| 49 | Beechwood Towne ClubNot reported | Nonprofit | Not reported | Not reported |
| 50 | Bel-air Water Conditioning CorporationNot reported | Corporation | Not reported | Not reported |