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| 75099646 | PTC | Paramemtric Technology Corporation | — |
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| 73483413 | PTC | PARKER CHIROPRACTIC RESEARCH FOUNDATION, INC. | — |
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| 73446085 | PTC | PR Hydraulik AB | — |
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| 73424363 | PTC | PT COMPONENTS, INC. | — |
| 73422563 | PTC | NORTH AMERICAN LABORATORIES CO., LTD. | — |
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| 73361811 | PTC | Pacific Telecommunications Council | 1225473 |
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| 73101040 | PTC | POWER TRANSISTOR CO. | 1101990 |
| 73083808 | PTC | PARMI TOOL CO., INC. | 1063165 |
| 73004956 | PTC | MAG AEROSPACE INDUSTRIES, INC. | 1020305 |
| 72400030 | PTC | PACIFIC TRANSDUCER CORPORATION | 0950338 |
| 72224876 | PTC | PACIFIC TRANSDUCER CORPORATION | 0802686 |
