| Headstrong 2084341 · TMA1284198 | Involve Consulting Inc. | 16 Paper41 Education | Registered | 2025 |
| HEADSTRONG 1056979 · TMA745652 | Headstrong Worldwide Limited | 9 Electronics16 Paper35 Advertising+3 | Registered | 2009 |
| HEADSTRONG 0797459 · TMA491212 | BIG HOLE BREWING COMPANY (A MONTANA CORPORATION) | 21 Housewares32 Beer | Registered | 1998 |
| HEADSTRONG 0923209 | Mental Health Commission of Canada | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2015 |
| HADSTO 2147691 · TMA1159517 · design | Zhuzhou Huarui Precision Cutting ToolsCo. Ltd. | 7 Machines | Registered | 2023 |
| HYDSTO 2195475 · design | Guangdong Yimu Technology Co., Ltd. | 7 Machines | Pending | 2022 |
| HEADSTART 2035669 · TMA1278284 | TIDI PRODUCTS, LLC | 10 Medical | Registered | 2024 |
| HEADSTOCK 1668818 · TMA905440 | Nickel Brook Brewing Company Inc. | 32 Beer | Registered | 2015 |
| HEADSTART 1515855 · TMA816403 | Canadian Credit Union Association Cooperative | 36 Finance | Registered | 2012 |
| HEATSTRIP 1501934 · TMA824543 · design | Thermofilm Australia Pty Ltd | 9 Electronics11 Lighting | Registered | 2012 |
| HEADSTART 1352435 · TMA800761 | Wonder Brands Inc. | 30 Coffee | Registered | 2011 |
| HEADSTART 0775128 · TMA457403 | THE SASKATOON COLOSTRUM COMPANY LTD. | 5 Pharmaceuticals | Registered | 1996 |
| HEADSTART 0755676 · TMA455278 · design | Canadian Credit Union Association Cooperative | 36 Finance | Registered | 1996 |
| HEADSTART 0733956 · TMA456202 | CHIN RIDGE SEED PROCESSORS LTD. | 31 Fresh | Registered | 1996 |
| HEADSTART 0663784 · TMA387365 · design | Canadian Credit Union Association Cooperative | 36 Finance | Registered | 1991 |
| HEADSTART 0542864 · TMA312995 · design | Canadian Credit Union Association Cooperative | 36 Finance | Registered | 1986 |
| HEADSTARTER 1923750 · TMA1110312 | Humii Incorporated | 3 Cosmetics5 Pharmaceuticals44 Medical | Registered | 2021 |
| HeatStim 1869390 · TMA1056232 | 3176282 Canada Ltd. | 10 Medical | Registered | 2019 |
| Headster 1827410 · TMA1140835 | Les collections Headster Kids inc. | 25 Clothing | Registered | 2022 |
| HEADSTANCE 1683426 · TMA975570 | an individual | 25 Clothing35 Advertising40 Treatment+1 | Registered | 2017 |
| HEADSHOT 1609895 · TMA926989 | Unilever Global IP Limited | 3 Cosmetics | Registered | 2016 |
| HITSTORM 1544658 · TMA886330 | Rogers Media Inc. | 35 Advertising38 Telecommunications41 Education | Registered | 2014 |
| HDXTREAM 1375220 · TMA771639 | iHeartMedia + Entertainment, Inc. | 9 Electronics | Registered | 2010 |