| Huopaniemen Puu Oy | Agriculture & fishing | 2005 |
| HurWe Systems Oy | Information & communication | 2007 |
| Hurjis Oy | Professional & scientific | 2014 |
| Hurma Projektit Osk | Administrative & support | 2018 |
| Hurmos Team Osk | Administrative & support | 2023 |
| Hush Aesthetics Oy | Health & social care | 2026 |
| Husky Flow Films Oy | Education | 2025 |
| Hustle Company Oy | Financial services | 2019 |
| Husveg Oy | Professional & scientific | 2025 |
| Huttunen Events Oy | Administrative & support | 2021 |
| Huuhtaja Fishing Lodge Oy | Hospitality | 2020 |
| Huukeri Oy | Construction | 1986 |
| Huukki Oy | Real estate | 2006 |
| Huura Invest Oy | Real estate | 2017 |
| Huurreviipale Oy | Financial services | 1976 |
| Huuskosen Teollisuus avoin yhtiö | Wholesale & retail | 1986 |
| Huutokauppa Ekman Oy | Wholesale & retail | 2018 |
| Huutokauppakirppis ToDo Oy | Wholesale & retail | 2026 |
| Huville Oy | Financial services | 2022 |
| Hybrid Moments Oy | Financial services | 2018 |
| Hybridiviestintä Effet Oy | Information & communication | 1990 |
| Hydraton Oy | Manufacturing | 2023 |
| Hygga Group Oy | Health & social care | 2014 |
| Hygga Oy | Health & social care | 2010 |
| Hygia Siivous Oy | Administrative & support | 2019 |
| Hylliläkiinteistö Oy | Real estate | 2012 |
| Hyminä Oy | Health & social care | 2026 |
| Hymy Lahtinen Oy | Financial services | 1990 |
| HymyPiste Oy | Health & social care | 2026 |
| HymyPlus Oy | Health & social care | 2025 |
| Hypcom Group Oy | Financial services | 2023 |
| Hypcom Oy | Manufacturing | 1994 |
| Hype Group Oy | Hospitality | 2023 |
| Hypeletics Oy | Arts & recreation | 2019 |
| Hypercat Oy | Information & communication | 2020 |
| Hyperkani Oy | Information & communication | 2009 |
| Hypofix Oy | Arts & recreation | 2011 |
| Hyrkkönen Holding Oy | Financial services | 2026 |
| Hyvikset Oy | Administrative & support | 2025 |
| Hyvinvoinnin Avaimet Oy | Wholesale & retail | 2012 |
| Hyvinvointiosuuskunta Liikkuva | Education | 2019 |
| Hyvinvointivalmennus Lepomieli Ky | Health & social care | 2014 |
| Hyvä Mikko Oy | Arts & recreation | 2024 |
| Hyvä Olo Group Avoin yhtiö | Health & social care | 2011 |
| Hyvä aamu oy | Professional & scientific | 2006 |
| Hyväiho Oy | Health & social care | 2024 |
| Hyvän Tuulen Puoti Oy | Wholesale & retail | 2011 |
| Hyvänolon Elämänpuu Oy | Health & social care | 2020 |
| Hyvärinen Consulting Oy | Administrative & support | 2021 |
| Hyvätaito Oy | Professional & scientific | 2012 |
| Hyötylämpö Oy | Manufacturing | 1950 |
| Hämeen Spes OY | Health & social care | 2013 |
| Hämpin Pizzeria OY | Hospitality | 2019 |
| HÖDER HEIMDALL Oy | Real estate | 2023 |
| Häggman Yhtiöt Oy | Education | 2025 |
| Häh Audio Oy | Other services | 2024 |
| Häijää Invest Oy | Transport & logistics | 2021 |
| Hämeen Asuntokehittäminen Oy | Real estate | 2025 |
| Hämeen Atk- ja tilipalvelu Oy | Professional & scientific | 1982 |
| Hämeen Autohuolto P.Riipinen Ky | Other services | 1991 |
| Hämeen Autopurkaamo Oy | Wholesale & retail | 1965 |
| Hämeen Hihnakuljetin Oy | Professional & scientific | 2000 |
| Hämeen Jäähdytys Oy | Construction | 1992 |
| Hämeen Kaivin Oy | Construction | 1975 |
| Hämeen Kivikauppa Oy | Mining & quarrying | 2010 |
| Hämeen Kuljetus Oy | Transport & logistics | 1962 |
| Hämeen Laatusiivous Oy | Administrative & support | 2014 |
| Hämeen Levytyö Kommandiittiyhtiö | Manufacturing | 1980 |
| Hämeen Mera-tilit Oy | Professional & scientific | 1993 |
| Hämeen Pientalopalvelu Ky | Wholesale & retail | 1990 |
| Hämeen Projektitekniikka Oy | Professional & scientific | 2002 |
| Hämeen Silmälasi Sijoitus Oy | Real estate | 2006 |
| Hämeen Tavarataxi Oy | Transport & logistics | 1992 |
| Hämeen Telecos Oy | Construction | 2004 |
| Hämeen Tilimiehet Oy | Professional & scientific | 1998 |
| Hämeen Trukkinostot Oy | Construction | 1993 |
| Hämeen-Pirkanmaan Marttapalvelut Oy | Administrative & support | 2013 |
| HämeenSilmä Oy | Health & social care | 2005 |
| Hämeenkadun Bistro Oy | Hospitality | 2018 |
| Hämeenkadun Telekommunikaatiokeskus Ky | Wholesale & retail | 1976 |
| Hämeenkatu - Grilli Oy | Hospitality | 2021 |
| Hämeenkyrön Asunnonhankinta Oy | Real estate | 1985 |
| Hämeenlinnan Asuntomarkkinointi Oy | Real estate | 2012 |
| Hämeenpuiston Hammasklinikka Oy | Health & social care | 2003 |
| Hämeenpuiston rakennuspalvelu Oy | Construction | 2022 |
| Hämpin 10 Kirppis avoin yhtiö | Wholesale & retail | 2016 |
| Härmän Raju Oy | Real estate | 2016 |
| Härö Ravintolat Oy | Hospitality | 2022 |
| Höganäs Borgestad Oy | Professional & scientific | 1990 |
| Höpöhöpö Group OY | Information & communication | 2024 |
| Höökii Ky | Arts & recreation | 2025 |
| I&I Nykänen Oy | Health & social care | 2018 |
| I. Kivelä Consulting Oy | Professional & scientific | 2025 |
| IA Ratkaisut Oy | Transport & logistics | 2025 |
| IBIS kivetykset Oy | Construction | 2023 |
| IBUMED Oy | Health & social care | 2025 |
| IC Invest Oy | Real estate | 2024 |
| Iceflake Studios OY | Information & communication | 2007 |
| ICF Protech Oy | Wholesale & retail | 1994 |
| Ichizoku OY | Hospitality | 2017 |