| STEAMACTIV 1454482 · TMA797029 | Kao Kabushiki Kaisha, also trading as Kao Corporation | 3 Cosmetics | Registered | 2011 |
| STENACTO 2158361 · TMA1271051 | Boehringer Ingelheim Vetmedica GmbH | 5 Pharmaceuticals | Registered | 2024 |
| STEAMASTER 1487128 · TMA796469 | STEAMASTER CO. INC. | 11 Lighting | Registered | 2011 |
| STENCIL 1804281 · TMA1025300 | Eclairage Axis Inc. | 11 Lighting | Registered | 2019 |
| STEMAXON 1790592 · TMA997473 | 9636137 Canada Inc. | 1 Chemicals5 Pharmaceuticals | Registered | 2018 |
| STENCIL 1451323 · TMA798399 | Prodigy Design Limited | 9 Electronics42 Science | Registered | 2011 |
| STEMCOR 1435345 · TMA824258 | Stemcor Holdings 2 Limited | 6 Metal36 Finance | Registered | 2012 |
| STEMCOL 0992001 · NFLD2001 | STANCO INCORPORATED (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 1933 |
| STEMIX 0663258 · TMA388783 | J.J. MAUGET CO. | 1 Chemicals | Registered | 1991 |
| STOMACHER 0369232 · TMA200907 | Seward Limited | 7 Machines9 Electronics | Registered | 1974 |
| STEMCO 0343371 · TMA184807 · design | Stemco Products, Inc. | 7 Machines12 Vehicles17 Rubber | Registered | 1972 |
| STEMCO 0343370 · TMA184806 | Stemco Products, Inc. | 7 Machines12 Vehicles17 Rubber | Registered | 1972 |
| STANASTIC 2329263 | Owner not listed | 1 Chemicals5 Pharmaceuticals31 Fresh | Pending | 2024 |
| STEMCELL 1975316 | STEMCELL Technologies Canada Inc. | 1 Chemicals5 Pharmaceuticals9 Electronics+2 | Pending | 2019 |
| STOMAHESIVE 0465394 · TMA300485 | ConvaTec Inc. | 5 Pharmaceuticals | Registered | 1985 |
| STOMAHESIVE 0353384 · TMA189559 | ConvaTec Inc. | 3 Cosmetics5 Pharmaceuticals10 Medical | Registered | 1973 |
| STENOGRAPH 2325260 · TMA1250370 · design | an individual | 9 Electronics16 Paper38 Telecommunications+2 | Registered | 2024 |
| SAOTANGTUI 2236523 · TMA1269889 · design | Owner not listed | 43 Restaurants | Registered | 2024 |
| STEAMCRISP 2236399 · TMA1256903 | SharkNinja Operating LLC | 11 Lighting | Registered | 2024 |
| SIUDANGKA 2232700 · TMA1256610 | an individual | 21 Housewares | Registered | 2024 |
| SITTINGSUITS 2226994 · TMA1243359 | an individual | 24 Textiles25 Clothing | Registered | 2024 |
| SATONAZAL 2225919 · TMA1250211 | Sato Pharmaceutical Co. Ltd. | 5 Pharmaceuticals | Registered | 2024 |
| SKATINGER 2223091 · TMA1272702 · design | Weihai Skatinger Outdoor Products Co. Ltd. | 28 Toys | Registered | 2024 |
| SWTYMIKI 2212820 · TMA1243173 | Changsha Yuanshangcao Technology Co.,Ltd. | 20 Furniture21 Housewares | Registered | 2024 |
| StangH 2201338 · TMA1210198 | Hangzhou Sitang Technology Co.Ltd | 20 Furniture24 Textiles27 Carpets | Registered | 2023 |