| Unimar Oy | Construction | 2010 |
| Uniski Oy | Information & communication | 2019 |
| United Auto OY | Other services | 2020 |
| Uphilltec Oy | Manufacturing | 2017 |
| Urheiluhieroja Lohja Oy | Health & social care | 2017 |
| Urho AI Solutions Oy | Information & communication | 2025 |
| Urhonex Group Oy | Financial services | 2025 |
| Ursula Herlin Comedy Oy | Arts & recreation | 2020 |
| Uudenmaan Apulaskutus Osk | Administrative & support | 2020 |
| Uudenmaan EcoSähkö Oy | Construction | 2016 |
| Uudenmaan Hammas Oy | Health & social care | 1978 |
| Uudenmaan Ilmastointitekniikka Oy | Construction | 1997 |
| Uudenmaan Kaivuu ja Vuokraus Oy | Construction | 2003 |
| Uudenmaan Kiinteistökone Oy | Administrative & support | 2000 |
| Uudenmaan Kylpyhuoneremontit Oy | Construction | 2026 |
| Uudenmaan Laatu-urakointi J. Sieppi Oy | Construction | 2017 |
| Uudenmaan Maanrakennus Oy | Construction | 1977 |
| Uudenmaan Pihamestarit Oy | Wholesale & retail | 2007 |
| Uudenmaan Projektipalvelu Oy | Professional & scientific | 2022 |
| Uudenmaan Sähkö- ja Aurinkotekniikka Oy | Construction | 2023 |
| Uudenmaan Sähköurakointi Oy | Construction | 2008 |
| Uudenmaan Talkkaripalvelut Oy | Administrative & support | 2020 |
| Uudenmaan Tilipalvelu Ky | Professional & scientific | 1967 |
| Uudenmaan Voimala-Asennus Ky | Real estate | 1973 |
| Uudenmaan taksipalvelu oy | Transport & logistics | 2025 |
| Uudenmaan työnohjaus- ja terapiapalvelut Oy | Health & social care | 1989 |
| Uusi Koti Oy | Information & communication | 2025 |
| V. Lahtinen Oy | Wholesale & retail | 2024 |
| V. Sander Oy | Agriculture & fishing | 2011 |
| VB Lasi Oy | Other services | 2024 |
| VE-MA Teletiimi Ky | Wholesale & retail | 1989 |
| VESMI Invest Oy | Real estate | 2025 |
| VHL-Kiinteistöt Oy | Real estate | 1975 |
| Vimba Ky | Professional & scientific | 2018 |
| VK nuohous/ muuraus Oy | Construction | 2025 |
| VM-Yhtiöt Oy | Construction | 2023 |
| VOS-Asennus oy | Manufacturing | 2026 |
| VOV Finance Oy | Real estate | 2007 |
| VP-Laitehuolto Oy | Construction | 2022 |
| VST Putki Oy | Construction | 2021 |
| VT-Rakenne Oy | Construction | 2026 |
| VV Show&Business Oy | Public administration | 2026 |
| VV Ykkönen Oy | Construction | 2025 |
| Vaajakallio Design Oy | Professional & scientific | 1985 |
| Vaanila Sail Oy | Financial services | 2021 |
| Vaarika Group Oy | Construction | 2019 |
| Vaatimaton Oy | Real estate | 2017 |
| Vaga Palvelu Oy | Construction | 2020 |
| Vainers Oy | Professional & scientific | 2023 |
| Valiokonsultointi Oy | Professional & scientific | 1991 |
| Valjasta Vapautesi Oy | Education | 2024 |
| Vallihart Oy | Wholesale & retail | 1993 |
| Valma Liikkanen Kommandiittiyhtiö | Manufacturing | 1961 |
| Valo Set Oy | Construction | 2026 |
| Valon Kone Oy | Manufacturing | 2004 |
| Vanguard Consulting Oy | Professional & scientific | 2018 |
| Vantaanportin Autohuolto Oy | Other services | 2018 |
| Vare Trading Oy | Wholesale & retail | 2015 |
| VarmaMitta Oy | Construction | 2018 |
| Varpis-pakuri avoin yhtiö | Agriculture & fishing | 2020 |
| Varren Nostopalvelut Oy | Construction | 2023 |
| Varsinas-Suomen Loisto Hinaus Oy | Transport & logistics | 2021 |
| Vartipuu Oy | Energy | 2015 |
| Varusteduo Oy | Construction | 2023 |
| Varux Oy | Professional & scientific | 2011 |
| Vasalevy Ky | | 1974 |
| Vasica Oy | Professional & scientific | 2024 |
| Vatta Oy | Administrative & support | 2013 |
| Vauhtipojat Oy | Construction | 2022 |
| Vehicles Import - Lohja Oy Ltd | Wholesale & retail | 2002 |
| Velerak Oy | Construction | 2017 |
| Velhona Oy | Financial services | 2025 |
| Veljesten Lämpö ja Vesitekniikka Oy | Construction | 2022 |
| Venemyynti Lindberg Oy | Wholesale & retail | 2009 |
| Vennalammi-tuotannot Oy | Arts & recreation | 2018 |
| Vertailer Oy | Transport & logistics | 2020 |
| ViMoPa Ky | Administrative & support | 2014 |
| Victis Oy | Construction | 2012 |
| VidaMedia Oy | Professional & scientific | 2022 |
| Video-one Oy | Information & communication | 2025 |
| Vienolan Remonttityöt Ky | Construction | 2008 |
| Vihdin Rakennuspalvelu Oy | Construction | 2014 |
| Viherminttu Oy | Administrative & support | 2003 |
| Viherpalvelu Ferm Oy | Administrative & support | 2025 |
| ViiVenli Oy | Financial services | 2017 |
| Viimo Oy | Administrative & support | 2010 |
| Vilamar Oy | Administrative & support | 2022 |
| Villa Eden care Oy | Health & social care | 2014 |
| Villa Future Oy | Health & social care | 2006 |
| Villa Kokkokallio Oy | Hospitality | 2021 |
| Villa Kukkumäki Oy | Health & social care | 2017 |
| Villa Lagus Oy | Real estate | 2015 |
| Villa Pasimo Oy | Education | 2024 |
| Villa Sjövik Oy | Financial services | 2006 |
| Villa Ursus Oy | Real estate | 2018 |
| Virak Ky Savolainen | Construction | 1990 |
| Virkblad Oy | Wholesale & retail | 2007 |
| Virkebygg Oy | Construction | 2014 |
| Virkkala Baari Oy | Hospitality | 2021 |
| Virkkala Capital Oy | Real estate | 2017 |