| OPTILITE 1815130 · TMA1056533 | CWI, LLC | 11 Lighting | Registered | 2019 |
| OPTILITE 1616902 · TMA875958 | The Binding Site Group, Ltd. | 9 Electronics10 Medical | Registered | 2014 |
| OPTILITE 2071075 | The Binding Site Group Limited | 4 Oils5 Pharmaceuticals9 Electronics+1 | Pending | 2020 |
| OPTALIDON 0153828 · TMDA51835 | NOVARTIS PHARMA CANADA INC. | 5 Pharmaceuticals | Registered | 1931 |
| OPTILINK 1733639 · TMA1026359 | DePuy Synthes, Inc. | 10 Medical | Registered | 2019 |
| OPTILINE 1694039 · TMA1051210 | an individual | 5 Pharmaceuticals10 Medical | Registered | 2019 |
| OPTELIAN 1593086 · TMA914669 · design | Optelian Access Networks Corporation | 9 Electronics37 Construction41 Education+1 | Registered | 2015 |
| OPTALERT 1418090 · TMA788864 | Optalert Australia Pty Ltd. | 9 Electronics10 Medical | Registered | 2011 |
| OPTILAIT 1354963 · TMA745923 | an individual | 42 Science44 Medical | Registered | 2009 |
| OPTALYS 1196170 · TMA635932 | an individual | 1 Chemicals | Registered | 2005 |
| OPTILIX 0781777 · TMA457163 | an individual | 10 Medical | Registered | 1996 |
| OPTAL 0427084 · TMA239473 | Henkel AG & Co. KGaA | 1 Chemicals | Registered | 1980 |
| OPTILINE 2080184 | Vertiv Corporation | 9 Electronics11 Lighting | Pending | 2021 |
| OptiLight 1835360 · TMA1060011 | Pilkington Group Limited | 9 Electronics21 Housewares | Registered | 2019 |
| OPTILINER 1660665 · TMA961201 | Owens Corning Intellectual Capital LLC | 6 Metal17 Rubber20 Furniture+1 | Registered | 2017 |
| OPDUALAG 2235043 · TMA1244565 · design | Owner not listed | 5 Pharmaceuticals | Registered | 2024 |
| OPTELLO 2120725 · TMA1185335 | CyberCoders, Inc. | 35 Advertising42 Science | Registered | 2023 |
| OPDUALAG 2091939 · TMA1211786 · design | BRISTOL-MYERS SQUIBB COMPANY | 5 Pharmaceuticals44 Medical | Registered | 2023 |
| OptiLake 2067132 · TMA1197556 | OASE GmbH | 1 Chemicals | Registered | 2023 |
| OBDIELA 1993514 · TMA1148757 | GENFIT | 5 Pharmaceuticals | Registered | 2022 |
| OPTOOL 1925946 · TMA1117914 | Daikin Industries, Ltd. | 1 Chemicals2 Paints4 Oils+1 | Registered | 2022 |
| OPDUALAG 1887232 · TMA1059123 | BRISTOL-MYERS SQUIBB COMPANY (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 2019 |
| OPDUOLAG 1887230 · TMA1059122 | BRISTOL-MYERS SQUIBB COMPANY (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 2019 |
| OVdialogue 1856876 · TMA1019491 | Owner not shown | 38 Telecommunications42 Science | Registered | 2019 |
| OPTEL 1836650 · TMA1002526 · design | Optel Vision Inc. | 7 Machines9 Electronics39 Transport+3 | Registered | 2018 |