| STEAMTEC 2261817 · TMA1281300 · design | Shenzhen TOLO Leisure Equipment Co. Limited | 11 Lighting | Registered | 2025 |
| STEMTECH 1537349 · TMA836731 · design | StemTech HealthSciences, Inc. | 3 Cosmetics5 Pharmaceuticals35 Advertising+1 | Registered | 2012 |
| STEMTECH 1275737 · TMA787083 | StemTech HealthSciences, Inc. | 5 Pharmaceuticals | Registered | 2011 |
| STENTECH 1042984 · TMA563828 | StenTech Limited | 1 Chemicals35 Advertising40 Treatment+2 | Registered | 2002 |
| SteamNet 1845872 · TMA1072987 | MIURA CO. LTD. | 9 Electronics | Registered | 2020 |
| STEAMATIC 1771338 · TMA997391 | STEAMATIC, LLC | 37 Construction40 Treatment | Registered | 2018 |
| STIMTEC 1486831 · TMA814048 | 3176282 Canada Ltd. | 10 Medical | Registered | 2011 |
| STONETECH 1358286 · TMA763685 | Laticrete International, Inc. a Connecticut corporation | 2 Paints3 Cosmetics | Registered | 2010 |
| STANTEC 0895721 · TMA537134 | Stantec Consulting Ltd. | 35 Advertising37 Construction41 Education+1 | Registered | 2000 |
| STEAMATE 0537894 · TMA310138 | BL Technologies, Inc. | 2 Paints | Registered | 1986 |
| STEAMTAPE 0511448 · TMA293649 | STERIS Corporation | 1 Chemicals5 Pharmaceuticals23 Yarns | Registered | 1984 |
| STANNATECH 1346398 · TMA727851 | Atotech Deutschland GmbH | 1 Chemicals | Registered | 2008 |
| STEAMathlete 2215978 | Owner not shown | 42 Science | Pending | 2022 |
| STEMTREE 1965839 · TMA1231887 | Stemtree Franchising, LLC DBA Stemtree Education Center | 41 Education | Registered | 2024 |
| STOMITCH 1864634 · TMA1055915 | an individual | 12 Vehicles | Registered | 2019 |
| STANTEX 0426959 · TMA243530 | Fashion Chemicals GmbH & Co. KG | 1 Chemicals12 Vehicles20 Furniture | Registered | 1980 |
| StemTV 2220829 | Kano Computing Limited | 9 Electronics38 Telecommunications | Pending | 2022 |
| STANDECZA 2171581 · TMA1200586 | Owner not shown | 5 Pharmaceuticals38 Telecommunications42 Science+1 | Registered | 2023 |
| StoneDam 2161295 · TMA1211167 | Dongguan Heyi Trading Co. Ltd. | 28 Toys | Registered | 2023 |
| STENDMAR 2125154 · TMA1170313 · design | BESCO USA, INC. | 20 Furniture | Registered | 2023 |
| SoTomaté!! 2119066 · TMA1201392 | Tomaté!! Inc. | 29 Meat30 Coffee31 Fresh+2 | Registered | 2023 |
| STEINDER 2111895 · TMA1192720 | Favonex Korea Ltd. | 8 Hand | Registered | 2023 |
| STANDOFF 2108237 · TMA1225853 | AXLEBOLT | 9 Electronics41 Education | Registered | 2024 |
| SIDANDE 2102299 · TMA1174934 · design | Shenzhen Diguang Imaging Technology Co. Ltd. | 9 Electronics | Registered | 2023 |
| STAINMATE 2077197 · TMA1205930 | an individual | 7 Machines | Registered | 2023 |