| PORTALBA 2171334 · TMA1221547 | an individual | 25 Clothing | Registered | 2024 |
| PORTALINK 1775873 · TMA1064778 | Portalink IP Pty Ltd | 35 Advertising36 Finance38 Telecommunications+1 | Registered | 2019 |
| PORTALIER 0430882 · TMA244396 | DART INDUSTRIES INC. | 21 Housewares | Registered | 1980 |
| PORTalign 0919795 | National Research Council of Canada | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2009 |
| PORTAL 2153301 · TMA1225222 · design | Zhejiang Hengfeng Top Leisure Co. Ltd | 11 Lighting24 Textiles28 Toys | Registered | 2024 |
| PORTAL 2130635 · TMA1225125 | Zhejiang Hengfeng Top Leisure Co. Ltd | 12 Vehicles18 Leather20 Furniture+2 | Registered | 2024 |
| PORTAL 1924524 · TMA1176897 | Meta Platforms, Inc. | 9 Electronics38 Telecommunications42 Science | Registered | 2023 |
| PORTAL 1812777 · TMA1103653 | FCA US LLC | 12 Vehicles | Registered | 2021 |
| PartaLog 1389413 · TMA741276 | Just Parts Online Incorporated | 2 Paints7 Machines9 Electronics+9 | Registered | 2009 |
| PORTAL 1337802 · TMA762584 | I3DVR International Inc. | 9 Electronics37 Construction45 Legal | Registered | 2010 |
| PORTALOO 0346290 · TMA187093 | Portakabin Limited | 6 Metal | Registered | 1972 |
| PORTAL 2365106 · design | Portal.brand Ltd | 18 Leather25 Clothing | Pending | 2024 |
| PORTAL 2335132 | Portal Biotechnologies, Inc. | 9 Electronics | Pending | 2024 |
| PERTUAL 2287338 | Xiamen Riding Beauty Sports Technology CO. LTD | 12 Vehicles | Pending | 2023 |
| PORTELA 2282809 | Zoetis Services LLC | 5 Pharmaceuticals | Pending | 2023 |
| PORTAL 2268051 | Owner not listed | 25 Clothing | Pending | 2023 |
| PORTAL 2172007 | an individual | 9 Electronics38 Telecommunications42 Science | Pending | 2022 |
| PORTALS 2103818 | Sidekick Analytics Inc. | 3 Cosmetics5 Pharmaceuticals9 Electronics+5 | Pending | 2021 |
| PORTALWAVE 1745501 · TMA990750 | Primdahl Energetics Inc. | 9 Electronics10 Medical41 Education+2 | Registered | 2018 |
| PORTLANDIA 1490727 · TMA854994 | Reinhart Global Brands, LLC | 25 Clothing | Registered | 2013 |
| Protealis 2121075 · TMA1208477 | Protealis | 1 Chemicals31 Fresh | Registered | 2023 |
| PARADOLIA 2072516 · TMA1280365 | KIMBALL INTERNATIONAL, INC. | 17 Rubber20 Furniture | Registered | 2025 |
| PORTAL724 1928208 · TMA1117707 · design | Portal 724 LLC | 9 Electronics35 Advertising38 Telecommunications+2 | Registered | 2022 |
| POWERTALK 1436379 · TMA830854 | EnerNOC, Inc. a Delaware Corporation | 9 Electronics38 Telecommunications42 Science | Registered | 2012 |
| PARTYLITE 0700141 · TMA420601 | PartyLite Worldwide, LLC. | 4 Oils11 Lighting21 Housewares+2 | Registered | 1993 |