| 99652444 | OPC | Motor Consultants of America, Inc. | — |
| 77663557 | OPC | OPC FEDERATION | 3666707 |
| 90333043 | OPC | The Barack Obama Foundation | 7502653 |
| 99911541 | OPC | One Punch Cards Inc. | — |
| 87917850 | OPC | Orthotic & Prosthetic Centers, Inc. | 5917712 |
| 90465468 | OPC | ONE POWER COMPANY | 8014004 |
| 74381787 | OPC | APPLIED BIOSYSTEMS, LLC | 1859527 |
| 86226444 | OPC | Okolona Pest Control, Inc. | 4620944 |
| 98468771 | OPC | Army Holding | — |
| 97625913 | OPC | Orthotic & Prosthetic Centers, Inc. | 7436314 |
| 78199861 | OPC | Okolona Pest Control, Inc. | 2786570 |
| 98325251 | OPC | Griffin Limited LLC | — |
| 87019134 | OPC | Aotearoa Fisheries Limited | 5230731 |
| 97698453 | OPC | Penny Lee | 7215085 |
| 85200844 | OPC | Clifford Sydney Cooper | 4289522 |
| 79098130 | OPC | CONG TY CO PHAN DUOC PHAM OPC (OPC PHARMACEUTICAL JOINT STOCK COMPANY) | — |
| 75027007 | OPC | ARDENT, INC. | 2060048 |
| 78732560 | OPC | OPC Foundation | 3212596 |
| 81026649 | OPC | Pemcor, Inc. | 1026649 |
| 77166717 | OPC | Oilfield Parts Corp. | 3365167 |
| 75366795 | OPC | RAINBOW WOMEN'S RETAIL GROUP LTD. | 2261574 |
| 75164509 | OPC | OPC FOUNDATION | 2259743 |
| 75074639 | OPC | Giant Bicycle, Inc. | — |
| 74176102 | OPC | INTERNATIONAL BUSINESS MACHINES CORPORATION | — |
| 73516069 | OPC | ORIENTAL PRECISION COMPANY LTD. | 1454914 |
| 73238489 | OPC | Harcourt Brace Jovanovich, Inc. | 1181589 |
| 73212259 | OPC | Ohio Precision Castings, Inc. | 1146390 |
| 73127017 | OPC | OKONITE COMPANY, THE | 1105522 |
