| SUNOCO 0581828 · TMA344857 · design | Suncor Energy Inc. | 35 Advertising36 Finance37 Construction+3 | Registered | 1988 |
| SUNOCO 0581827 · TMA344856 | Suncor Energy Inc. | 35 Advertising36 Finance37 Construction+3 | Registered | 1988 |
| SUNOCO 0564635 · TMA327319 · design | Suncor Energy Inc. | 1 Chemicals3 Cosmetics4 Oils+4 | Registered | 1987 |
| SUNOCO 0304668 · TMA155069 · design | Suncor Energy Inc. | 1 Chemicals3 Cosmetics4 Oils+5 | Registered | 1968 |
| SUNOCO 0205715 · UCA35533 | Suncor Energy Inc. | 1 Chemicals3 Cosmetics4 Oils+4 | Registered | 1950 |
| "SONOCO" 0190729 · UCA24979 | SPC Resources, Inc. (a Delaware corporation) | 16 Paper | Registered | 1946 |
| SINISCO 0784015 · TMA477458 | GROUPE SINISCO INC. | 35 Advertising | Registered | 1997 |
| SYNCO 2302827 · TMA1233053 | Shenzhen Nuoda Technology Co. Ltd. | 9 Electronics | Registered | 2024 |
| SNOC 2239286 · TMA1233029 · design | Owner not listed | 6 Metal11 Lighting | Registered | 2024 |
| SINOSK 2230402 · TMA1256514 · design | Shaanxi Shengke Electronic Technology Co. Ltd. | 9 Electronics | Registered | 2024 |
| SINCX 2148726 · TMA1227961 · design | SincX Technologies Inc. | 35 Advertising41 Education42 Science | Registered | 2024 |
| SINCX 2140667 · TMA1227928 | SincX Technologies Inc. | 41 Education42 Science | Registered | 2024 |
| Synco 1973301 · TMA1121408 | Synco Technology Inc. | 11 Lighting | Registered | 2022 |
| SINCH 1937331 · TMA1147487 | an individual | 9 Electronics38 Telecommunications42 Science | Registered | 2022 |
| SINEC 1766056 · TMA1039755 | an individual | 9 Electronics | Registered | 2019 |
| SINKO 1706710 · TMA1046310 · design | SINKO INDUSTRIES LTD. | 6 Metal7 Machines9 Electronics+2 | Registered | 2019 |
| SENCO 1455320 · TMA801899 | KYOCERA SENCO Industrial Tools, Inc. | 6 Metal7 Machines17 Rubber | Registered | 2011 |
| SIMCO 1240373 · TMA657634 | ILLINOIS TOOL WORKS INC. | 7 Machines9 Electronics | Registered | 2006 |
| SYNCO 0549323 · TMA321173 | SYNCO CHEMICAL CORPORATION | 4 Oils5 Pharmaceuticals | Registered | 1986 |
| SANCO 0472130 · TMA290134 | HME Copper Germany GmbH | 7 Machines37 Construction42 Science | Registered | 1984 |
| SUNCO 2344735 | Owner not listed | 35 Advertising36 Finance38 Telecommunications+1 | Pending | 2024 |
| SUNCO 2344733 · design | Owner not listed | 35 Advertising36 Finance38 Telecommunications+1 | Pending | 2024 |
| sinkoo 2291061 | Henan Shengke trade Co. LTD | 20 Furniture | Pending | 2023 |
| Shinco 2276394 | JIANGSU YOAU ELECTRIC CO. LTD. | 7 Machines11 Lighting | Pending | 2023 |
| SINISO 2275711 · design | Guangdong New Jincheng Ceramic Group Co. Ltd | 19 Building20 Furniture | Pending | 2023 |