| Helma Oy | Wholesale & retail | 1993 |
| Helmenmaa Oy | Professional & scientific | 2025 |
| Helmi Haven Oy | Real estate | 2024 |
| Helmi-palvelut22 oy | Transport & logistics | 2022 |
| Helmihuone Oy | Hospitality | 2011 |
| Helmini Oy | Arts & recreation | 2022 |
| Helmipalvelut Oy | Other services | 2023 |
| Help System Oy | Administrative & support | 2010 |
| HelpBus Oy | Transport & logistics | 2009 |
| Helpcont Ky | Manufacturing | 1990 |
| Helpek Oy | Real estate | 2026 |
| Helpful Jokinen Oy | Transport & logistics | 2005 |
| Helpotkotisivut.fi MS Oy | Wholesale & retail | 2013 |
| HelppOn Home Oy | Administrative & support | 2023 |
| Helppokäyttöinen Oy | Hospitality | 2025 |
| Helpponetti Oy | Transport & logistics | 2018 |
| Helpway Oy | Construction | 2023 |
| Helsingin AV-Yhtymä Oy | Construction | 1976 |
| Helsingin Apumiehet Oy | Construction | 2006 |
| Helsingin Apurit Oy | Hospitality | 2020 |
| Helsingin Clips Oy | Other services | 2018 |
| Helsingin Dieselpalvelu H.D Oy | Other services | 2023 |
| Helsingin Filmaus Oy | Manufacturing | 1987 |
| Helsingin Hihna Oy | Construction | 2002 |
| Helsingin Huoltopalvelut Oy | Administrative & support | 2022 |
| Helsingin Huoltotoimi Oy | Administrative & support | 2003 |
| Helsingin Kurottajapalvelu Oy | Construction | 2017 |
| Helsingin LVIS-Suunnittelu Oy | Professional & scientific | 2023 |
| Helsingin MTB-Mainos Oy | Professional & scientific | 1987 |
| Helsingin Metallityöt Oy | Manufacturing | 2019 |
| Helsingin Monirakennus Oy | Construction | 1995 |
| Helsingin Net-import Oy | Wholesale & retail | 1989 |
| Helsingin Paine- ja Höyrypesut Oy | Professional & scientific | 2015 |
| Helsingin Productum Oy | Information & communication | 1994 |
| Helsingin Putkirakennus Oy | Construction | 2019 |
| Helsingin Rakennuskeskus Oy | Construction | 2016 |
| Helsingin Seudun Kotijoukot Oy | Health & social care | 2007 |
| Helsingin Soffatalo Oy | Real estate | 1994 |
| Helsingin Soundit Sävelet Oy | Arts & recreation | 1995 |
| Helsingin Taksipalvelu Oy | Transport & logistics | 1982 |
| Helsingin Teho-Antenni Oy | Construction | 1997 |
| Helsingin Tikka ja Taulu Oy | Wholesale & retail | 2026 |
| Helsingin Tilitoimisto n:o 1 Oy | Professional & scientific | 1997 |
| Helsingin Timanttityö Oy | Construction | 1984 |
| Helsingin Toripojat Oy | Hospitality | 2006 |
| Helsingin Valo- ja äänityöpalvelu Oy | Arts & recreation | 1980 |
| Helsingin Viherrakennus Oy | Water & waste | 2025 |
| Helsingin Yritystilat Oy | Professional & scientific | 1991 |
| Helsingin kuivaustekniikka Oy | Professional & scientific | 2010 |
| Helsingin piensaneeraus Oy | Construction | 2024 |
| Helsinki Automatic Center Oy | Other services | 1984 |
| Helsinki Duck Store Oy | Wholesale & retail | 2025 |
| Helsinki Finest Oy | Construction | 2016 |
| Helsinki Gift & Design Oy | Wholesale & retail | 2025 |
| Helsinki Motor Dealer Oy | Construction | 2024 |
| Helsinki Sports Clinic Oy | Health & social care | 2016 |
| Helsinki Valve & Fitting Ab | Wholesale & retail | 1983 |
| Helsinki taksi 851 oy | Transport & logistics | 2025 |
| Helstein Oy | Construction | 2024 |
| Helsubi Oy | Hospitality | 2024 |
| Heltek Group Oy | Construction | 2022 |
| Heltrans OY | Transport & logistics | 2018 |
| Hemmalin Ky | Wholesale & retail | 2000 |
| Hemn ja Goran avoin yhtiö | Hospitality | 2025 |
| Hemona Oy | Construction | 1997 |
| Henberg Asennus Oy | Construction | 2014 |
| Henberg Oy | Information & communication | 2018 |
| Henkel Finland Oy | Wholesale & retail | 1896 |
| HenkilöstöTaiturit Oy | Administrative & support | 2023 |
| Henkilöstökumppani Oy | Administrative & support | 1992 |
| Henkilövuokraus HTM Oy | Administrative & support | 2021 |
| Hennex Rakennus Ky | Construction | 2016 |
| Hennotech Oy | Information & communication | 2021 |
| Henri I Consulting Oy | Education | 2023 |
| Henri Salo Oy | Professional & scientific | 2011 |
| Henry Logistics OY | Transport & logistics | 2025 |
| Henstone Growth Partners Oy | Professional & scientific | 2025 |
| Her Shop Oy | Wholesale & retail | 1991 |
| HerLux Oy | Professional & scientific | 2022 |
| Hera Fin-Chi Group Oy | Other services | 2023 |
| Heras Finland High Security Oy | Wholesale & retail | 1970 |
| Herbalink Oy | Wholesale & retail | 1992 |
| Herbalmaa Oy | Wholesale & retail | 2021 |
| Heritos Oy | Financial services | 1990 |
| Herkku H & Taitavuus Oy | Wholesale & retail | 2017 |
| HerkkuHovi Oy | Manufacturing | 2008 |
| Herkkä Hevosmies Oy | Health & social care | 2021 |
| Herkules Oy | Hospitality | 2023 |
| Hermanni Laakso Oy | Construction | 1996 |
| Hermesia Oy | Real estate | 1934 |
| Hermit Campers Oy | Administrative & support | 2011 |
| Heroic Oy | Information & communication | 2018 |
| Herrain Huone Oy | Other services | 2008 |
| Herrain Kauppa Oy | Wholesale & retail | 2024 |
| Herteko Oy | Construction | 2020 |
| Hertex Oy | Construction | 2024 |
| Hertola Consulting Oy | Administrative & support | 2020 |
| Herttoniemen Putkivaruste Oy | Construction | 1949 |
| Herttoniemi Ravintola Oy | Transport & logistics | 2022 |
| Herttuan tyttäret Oy | Hospitality | 2015 |