| Heikki Sipilä Oy | Financial services | 1993 |
| Heikki ja Tuija Pernu avoin yhtiö | Professional & scientific | 2017 |
| Heikkilän Laatuosake Oy | Financial services | 2022 |
| Heilala Capital Oy | Financial services | 2018 |
| Heim Helsinki Oy | Construction | 2019 |
| Heimax Oy | Wholesale & retail | 2023 |
| Heimhällen Oy Ab | Financial services | 1985 |
| Heimland Invest Oy | Professional & scientific | 2018 |
| Heimo Välinen Oy | Wholesale & retail | 1979 |
| Heimogroup Oy | Administrative & support | 2022 |
| Heimosto Oy | Wholesale & retail | 2022 |
| Heinah Siivouspalvelut Oy | Administrative & support | 2022 |
| Heiniemen tili- ja sisustus Oy | Professional & scientific | 2012 |
| Heinäveden fysiokeskus Ky | Health & social care | 1996 |
| Heiskari Capital Oy | Administrative & support | 2024 |
| Hekondi Oy | Manufacturing | 2020 |
| Hekri Ankkuri Oy | Real estate | 2025 |
| Hekri Invest Oy | Real estate | 2021 |
| HelMir Rakennus Oy | Construction | 2011 |
| HelMonk Security Oy | Information & communication | 2026 |
| Helaniemi Dental Care Oy | Health & social care | 2026 |
| Helcars oy | Other services | 2022 |
| Helefex Ltd Oy | Professional & scientific | 1990 |
| Helena Trading Oy | Wholesale & retail | 1985 |
| Helge Ratilainen Oy | Financial services | 1989 |
| Heli Alén Oy | Professional & scientific | 2017 |
| HeliFlyFinland Oy | Wholesale & retail | 2015 |
| Helianthus Oy | Financial services | 2023 |
| Helidom Oy | Professional & scientific | 2022 |
| Helihaus Oy | Real estate | 1983 |
| Helios One Oy | Information & communication | 2026 |
| Helja Capital Oy | Financial services | 2022 |
| Helkala Holding Oy | Professional & scientific | 2019 |
| Helkama Liikkuva Oy | Wholesale & retail | 2022 |
| Helkama Rent Oy | Administrative & support | 2010 |
| Helkama Works Oy | Professional & scientific | 2015 |
| Helkama-Auto Oy | Wholesale & retail | 1942 |
| Helkama-Autokauppa Oy | Wholesale & retail | 2023 |
| Helkama-Kiinteistöt Oy | Real estate | 2010 |
| Helke Soundsystems OY | Professional & scientific | 2024 |
| Helkiö Audit Oy | Professional & scientific | 2013 |
| Helle Foods Oy | Hospitality | 2025 |
| Helle Records Oy | Administrative & support | 2005 |
| Hellfors Consulting Oy | Professional & scientific | 2023 |
| Hello Brands Oy | Professional & scientific | 2023 |
| Hello Heno Oy | Professional & scientific | 2020 |
| Hellén Advisory Oy | Professional & scientific | 2022 |
| Helmeilevä Oy | Manufacturing | 2012 |
| Helmi Do Oy | Other services | 2019 |
| Helmi Holding Oy | Financial services | 2025 |
| Helmicon Oy | Financial services | 2007 |
| Helnet Oy | Financial services | 1998 |
| Helopuro Invest Oy | Financial services | 2021 |
| Helos Oy | Professional & scientific | 1990 |
| HelpBerg Ky | Construction | 2007 |
| Helpot Tavat Oy | Professional & scientific | 2023 |
| Helppari Oy | Information & communication | 2009 |
| Helppo arki Oy | Education | 2018 |
| HelppoKatsastus Oy | Professional & scientific | 2008 |
| Helppoa OY | Information & communication | 2025 |
| Helsingin Ajurit Oy | Education | 2013 |
| Helsingin Asunto & Rakennus Oy | Real estate | 1990 |
| Helsingin Autokouluvarustelu Oy | Wholesale & retail | 1987 |
| Helsingin Energy-Trade Oy | Real estate | 1970 |
| Helsingin Herrojen Luppo Oy | Financial services | 1986 |
| Helsingin Juhlamusiikkipalvelu Oy | Arts & recreation | 1996 |
| Helsingin Julkisivurappaus Oy | Construction | 1997 |
| Helsingin Jäätelötehdas Oy | Manufacturing | 1991 |
| Helsingin K.O.K.O. keittiöhygienia Oy | Wholesale & retail | 1996 |
| Helsingin KOTI LKV Oy | Real estate | 2013 |
| Helsingin Kartanoravintolat Oy | Hospitality | 2002 |
| Helsingin Katto- ja rakennustakuu Oy | Construction | 2007 |
| Helsingin Kivimiehet Oy | Construction | 1995 |
| Helsingin Kodinkonehuolto Oy | Other services | 1976 |
| Helsingin Kopiokeskus, kommandiittiyhtiö Ahlroos | Administrative & support | 1979 |
| Helsingin Koslat Oy | Transport & logistics | 2025 |
| Helsingin Kylmäpalvelu Oy | Wholesale & retail | 1997 |
| Helsingin Laatuauto Oy | Transport & logistics | 2018 |
| Helsingin Laatuhuoneistot Oy | Real estate | 2001 |
| Helsingin Laki- ja Kiinteistökeskus Oy | Professional & scientific | 1992 |
| Helsingin Laskentatoimi Oy | Professional & scientific | 1978 |
| Helsingin Long River Oy | Hospitality | 1998 |
| Helsingin Maalauspalvelu Oy | Wholesale & retail | 2009 |
| Helsingin Monitaiturit Oy | Administrative & support | 1986 |
| Helsingin Putkihuolto Oy | Construction | 2014 |
| Helsingin Puutarhakeidas Oy | Financial services | 2010 |
| Helsingin Rakennusrivakka Oy | Administrative & support | 1996 |
| Helsingin Raksapalvelut Oy | Wholesale & retail | 2018 |
| Helsingin Raudoitus Oy | Construction | 2026 |
| Helsingin Revisor Oy | Professional & scientific | 2008 |
| Helsingin Saaristoristeilyt Oy | Transport & logistics | 2010 |
| Helsingin Sisustuspuu Oy | Manufacturing | 1989 |
| Helsingin Sulkapallohallit Oy | Arts & recreation | 1982 |
| Helsingin Talotekniikka Oy | Construction | 1996 |
| Helsingin Tehotorjunta Oy | Administrative & support | 2024 |
| Helsingin Telepalvelu Oy | Wholesale & retail | 1989 |
| Helsingin Text and Mounting Ky | Manufacturing | 1984 |
| Helsingin Tilicom Oy | Professional & scientific | 1994 |
| Helsingin Tilintarkastuskeskus Oy | Professional & scientific | 2003 |
| Helsingin Tuotekehitys Oy | Professional & scientific | 1984 |