| STRICT 1418064 · TMA757885 | iP Group Ltd. | 9 Electronics | Registered | 2010 |
| STRUCT 1715663 · TMA957060 | MASCO CANADA LIMITED | 11 Lighting | Registered | 2016 |
| Strikt 1585549 · TMA880161 | an individual | 9 Electronics25 Clothing | Registered | 2014 |
| STRUCELL 1412157 · TMA781084 · design | CHANGZHOU TIANSHENG NEW MATERIALS CO. LTD. | 1 Chemicals16 Paper17 Rubber+1 | Registered | 2010 |
| STRUCTAL 0853027 · TMA513445 | Süddekor GmbH | 2 Paints16 Paper17 Rubber+1 | Registered | 1999 |
| STRICK 0645155 · TMA378956 | Strick Trailers, LLC | 12 Vehicles | Registered | 1991 |
| STRICK 0644625 · TMA385726 · design | Strick Trailers, LLC | 6 Metal12 Vehicles | Registered | 1991 |
| STRICH 2325640 | Strich Technology CO, Limited | 15 Musical | Pending | 2024 |
| STERICYCLE 1819895 · TMA1051260 | Stericycle Inc. | 37 Construction38 Telecommunications39 Transport+1 | Registered | 2019 |
| STERICYCLE 1235248 · TMA657522 | Stericycle Inc. | 40 Treatment | Registered | 2006 |
| STRUCTURIX 0249843 · TMA115706 | Baker Hughes Digital Solutions GmbH | 1 Chemicals | Registered | 1959 |
| STRAIGHTLINE 1427564 · TMA759728 | Omex Agriculture Inc. | 1 Chemicals | Registered | 2010 |
| STrighter 2184031 · TMA1230507 | Dongguan Baizhenxun E-Commerce Co. Ltd. | 11 Lighting | Registered | 2024 |
| STERICARE 2078933 · TMA1140640 | Nitleg Limited | 10 Medical | Registered | 2022 |
| STERICIDE 2026326 · TMA1242236 | ConSeal International Incorporated | 5 Pharmaceuticals | Registered | 2024 |
| STERICARE 2002210 · TMA1105993 | Nitleg Limited | 5 Pharmaceuticals20 Furniture24 Textiles+1 | Registered | 2021 |
| STORACELL 1829293 · TMA1161865 | Tools Aviation, LLC dba Powerpax | 9 Electronics | Registered | 2023 |
| STRUCTUBE 1616404 · TMA896562 | STRUC-TUBE LTD STRUC-TUBE LTEE | 8 Hand9 Electronics11 Lighting+7 | Registered | 2015 |
| STERISTAY 1578016 · TMA884389 · design | an individual | 10 Medical | Registered | 2014 |
| STRIACURE 1537067 · TMA863599 | Lifeagen Biosciences of Florida Inc. | 3 Cosmetics | Registered | 2013 |
| STRUCTURE 1516405 · TMA818252 · design | ZOTOS INTERNATIONAL, INC. | 3 Cosmetics | Registered | 2012 |
| STRUCTURA 1442903 · TMA778365 | Portes Standard Inc. | 6 Metal19 Building | Registered | 2010 |
| STRUCTURA 1435674 · TMA801354 | an individual | 33 Wine | Registered | 2011 |
| STERICHEK 1313351 · TMA693143 | Hach Company | 1 Chemicals | Registered | 2007 |
| STRUCTURA 1201849 · TMA691248 | Owner not shown | 30 Coffee | Registered | 2007 |