| Company | Industry | Year |
|---|---|---|
| PNC Bank, N.A. | Financial Services | 2004 |
| Zippo Manufacturing Co. | General Consumer Goods | 1994 |
| Harbison-Walker Int'l | Machine Tools/Metal Working Equip. | 1990 |
| Duquesne Systems Inc. | Computer Software and Services | 1989 |
| Black Box Corporation | Telecommunications Equipment | 1987 |
| Process Corporation | Computer Software and Services | 1985 |
| Expandor Inc. | Telecommunications Equip. | 1982 |
| JLG Industries | Construction/Engineering Services | 1981 |
| MEDRAD Inc. | Machine Tools/Metal Working Equip. | 1980 |
| Hughson Chemicals | Industrial Chemicals | 1980 |
| Sauereisen Co. | Composite Materials | 1978 |
| Penn Brass & Copper | Non-Ferrous Metals | 1976 |
| Kerotest Manufacturing Corp. | Oil/Gas Field Machinery | 1976 |
| Weld Tooling Corp. | Tools-Hand Power | 1976 |
| Erie Strayer Int'l | Construction Equip. | 1974 |
| Equibank, N.A. | Financial Services | 1973 |
| World Tooling Corp. | Machine Tools/Metal Working Equip. | 1969 |
| West Penn Power Co. | Electrical Power Systems | 1965 |
| Eriez Magnetics | Electronic Components | 1965 |
| Copperweld Steel | Electronic Components | 1965 |
| Pittsburgh Chemical Co. | Industrial Chemicals | 1964 |
| Eastern Associated Coal Corp. | Coal | 1964 |
| Nuclear Materials & Equip. Corp. | Electrical Power Systems | 1964 |
| Bacharach Industrial Instrument Co. | Tools-Hand Power | 1964 |
| Uniflow Manufacturing Co. | Industrial Chemicals | 1964 |
| American Sterilizer Co. | Industrial Chemicals | 1963 |
| Koppers Company Inc. | General Industrial Equip. & Supplies | 1963 |
| Nuclide Analysis Association | General Industrial Equip. & Supplies | 1963 |
| Alfred Teshen | General Industrial Equip. & Supplies | 1963 |
| Greater Pittsburgh Chamber of Commerce | Trade Promotion Services | 1963 |
| Forney's Inc., Tester Division | General Industrial Equip. & Supplies | 1963 |
| Autoclave Engineers Inc. | Electronic Components | 1962 |
| Zurn Int'l Division | General Industrial Equip. & Supplies | 1962 |