| Haapasaari Invest Oy | Real estate | 2020 |
| Haara Group Oy | Financial services | 2025 |
| Haarla Construction Oy | Wholesale & retail | 2024 |
| Haarla Engineering Services Oy | Wholesale & retail | 2024 |
| Haarla Food Ingredients Oy | Wholesale & retail | 2024 |
| Haarla Group Oy | Wholesale & retail | 2020 |
| Haatek Holding Oy | Financial services | 2026 |
| Haatek Oy | Construction | 2023 |
| Habitus Hildén Oy | Real estate | 2022 |
| Habu Oy | Hospitality | 2014 |
| Hademec Oy | Professional & scientific | 1992 |
| Hadi Foods Oy | Hospitality | 2023 |
| Haffeg 123 Gov Oy | Administrative & support | 2007 |
| Hagfin Oy | Professional & scientific | 2016 |
| Haglex Group Oy | Professional & scientific | 2016 |
| Haglex Oy | Professional & scientific | 2023 |
| Hah Hah Haapala Oy | Arts & recreation | 2019 |
| Haika Oy | Health & social care | 2020 |
| Hair Garage Oy | Other services | 2015 |
| HairStiil Oy | Other services | 2019 |
| Haircolorzone Oy | Other services | 2022 |
| Haj-Logistics Oy | Transport & logistics | 2021 |
| Haja-Sijoitus Oy | Arts & recreation | 2009 |
| Haka Business Oy | Health & social care | 2025 |
| Haka-Terveys Oy | Wholesale & retail | 2006 |
| HakaLattiat Oy | Construction | 2018 |
| Hakalan Verhoomo Oy | Other services | 1977 |
| Hakalääkärit Oy | Health & social care | 2005 |
| Hakametsä 3 Oy | Arts & recreation | 1995 |
| Hakametsä Jerky Company Ltd | Manufacturing | 2024 |
| Hakametsän DT Oy | Hospitality | 1998 |
| Hakametsän Eläinlääkäripalvelu Oy | Professional & scientific | 1989 |
| Hakametsän Kehitys Oy | Professional & scientific | 2022 |
| Hakametsän Lämäri Oy | Wholesale & retail | 2022 |
| Hakametsän Palvelut Oy | Hospitality | 2007 |
| Hakamettän Pojat Oy | Real estate | 2017 |
| Hakasen Leipomo Oy | Manufacturing | 1985 |
| Hakkarainen & Siurola Oy | Real estate | 2022 |
| Hako Group Oy | Administrative & support | 2023 |
| Hakora Ky | Wholesale & retail | 2017 |
| Hakukonekeisari Oy | Professional & scientific | 2015 |
| Hakulinen Consulting Oy | Information & communication | 2020 |
| Hakura Oy | Construction | 2007 |
| Halaamo Oy | Other services | 2019 |
| Halehia Ky | Professional & scientific | 1990 |
| Half There Oy | Financial services | 2022 |
| Halic Avoin Yhtiö | Hospitality | 1995 |
| Haliforus Oy | Financial services | 1998 |
| Halime Oy | Wholesale & retail | 2012 |
| Halko Trading Oy | Wholesale & retail | 2019 |
| Halleri Oy | Wholesale & retail | 2009 |
| Hallikiinteistö Oy Ahertajankatu 17 | Real estate | 1988 |
| Hallilan Kuljetus Oy | Transport & logistics | 1996 |
| Hallintopalvelut Hannula Oy | Real estate | 1998 |
| Halo Consulting Oy | Professional & scientific | 2020 |
| Halonen Group Oy | Arts & recreation | 2021 |
| Haltu Oy | Information & communication | 2010 |
| Hamdi Uludag ravintola | Hospitality | 2005 |
| Hamimani Oy | Hospitality | 2009 |
| Hammas Hipsteri Oy | Health & social care | 2025 |
| HammasKangas Oy | Health & social care | 2000 |
| HammasTampere Oy | Health & social care | 2018 |
| Hammasfakta Oy | Health & social care | 1988 |
| Hammaskauppa Oy | Wholesale & retail | 2026 |
| Hammasklinikka Kruunu Oy | Health & social care | 1997 |
| Hammaslaboratorio Jalo Hammas Ky | Health & social care | 2000 |
| Hammaslaboratorio Katariina Ruisvaara Oy | Manufacturing | 2006 |
| Hammaslaboratorio Laakkonen Oy | Manufacturing | 2021 |
| Hammaslaboratorio Uniikkihammas Oy | Manufacturing | 2002 |
| Hammaslääkäri Annu Forsell Oy | Health & social care | 2012 |
| Hammaslääkäri Erik Antikainen Oy | Health & social care | 2025 |
| Hammaslääkäri Hannele Vitikka Oy | Health & social care | 2005 |
| Hammaslääkäri M. Kauppila Oy | Health & social care | 2017 |
| Hammaslääkäri Per-Rune Jansen Oy | Health & social care | 1998 |
| Hammaslääkäri Päivi Perkkiö Oy | Health & social care | 2012 |
| Hammaslääkäriasema Helmiäinen Oy | Health & social care | 2019 |
| Hammaslääkäriasema Tampereen Helmi Oy | Health & social care | 2020 |
| Hammaslääkäripalvelu AM Oy | Health & social care | 2006 |
| Hammaslääkäripalvelu Elina Koivumäki Oy | Health & social care | 2021 |
| HammerData Ky | Other services | 2011 |
| Han Sushi Oy | Hospitality | 2020 |
| Handlanger Trading Oy | Administrative & support | 2019 |
| Hanes Digital Marketing Oy | Professional & scientific | 2024 |
| Hanguk Oy | Hospitality | 2022 |
| Hanhenmarssi Holding Oy | Real estate | 2016 |
| Hani-Tuote Oy | Wholesale & retail | 1986 |
| Hankela Asset Management Oy | Real estate | 1992 |
| Hankiainen Oy | Professional & scientific | 2025 |
| Hankinta Unioni Oy | Wholesale & retail | 2019 |
| HankintaDynamo Oy | Professional & scientific | 2024 |
| Hankkio Development Oy | Professional & scientific | 2025 |
| Hanmas Oy | Health & social care | 2020 |
| Hanna Lajunen Consulting Oy | Professional & scientific | 2021 |
| Hanna Marttila Consulting Oy | Professional & scientific | 2009 |
| Hannan Avustajapalvelut Oy | Other services | 2023 |
| HannasLykke Oy | Health & social care | 2022 |
| Hanne Kotajärvi Oy | Professional & scientific | 2024 |
| Hannele's Bar & Bistro Oy | Hospitality | 2020 |
| Hannu Huhtaniemi Ky | Wholesale & retail | 1980 |
| Hannu Järvimäki Group Oy | Real estate | 2019 |