| Turf Monitoring International Oy | Wholesale & retail | 2014 |
| Turkis Oscar Ky | Wholesale & retail | 1983 |
| Turkismuokkaamo Furpels Oy | Manufacturing | 2000 |
| Tuttu tuki Oy | Other services | 2026 |
| Tuula Sivonen Oy | Administrative & support | 2012 |
| Tuulin Tornikahvila Oy | Hospitality | 2016 |
| Tuuloksen Rakentajat Oy | Construction | 1987 |
| Tuulplan Oy | Construction | 1995 |
| Twebs Oy | Information & communication | 2015 |
| Twisted Brothers Marketing Oy | Professional & scientific | 2022 |
| TydeCell Oy | Transport & logistics | 2017 |
| Tyni Kiinteistöt Oy | Real estate | 2025 |
| Tyyppä Oy | Education | 2022 |
| Työmaakolmio Oy | Construction | 2024 |
| Työmaavalvonta Yli-Huhtala Oy | Professional & scientific | 2006 |
| Työnohjaus- ja konsultointipalvelut Luovuus Oy | Professional & scientific | 2023 |
| Työstöhankinta Reponen Oy | Manufacturing | 1985 |
| Tähtitarkastus Oy | Professional & scientific | 2017 |
| Täppinen Konsultointi Oy | Professional & scientific | 2012 |
| Täysosuma Pelikahvila Oy | Education | 2003 |
| UDG Oy | Wholesale & retail | 2009 |
| UME Fashion oy / Ulla´s spirit | Wholesale & retail | 2013 |
| Unifest Finland OY | Administrative & support | 2008 |
| Uimaopettaja Katariina Oy | Arts & recreation | 2024 |
| Ulottuvuusmatkat Oy | Arts & recreation | 2020 |
| Ultimi Soft Oy | Information & communication | 1994 |
| Ultra Rakennus Oy | Construction | 2017 |
| Undercover Innovations Oy | Administrative & support | 2024 |
| Uneksimo Oy | Professional & scientific | 2014 |
| Unikko Tukipalvelut Oy | Health & social care | 2021 |
| Uniku Oy | Construction | 2017 |
| Unique Universe Oy | Arts & recreation | 2024 |
| Unispe Oy | Information & communication | 1988 |
| Unisto Oy | Professional & scientific | 1998 |
| Up Hill Rakentajat Oy | Construction | 2015 |
| Upsight Oy | Health & social care | 2015 |
| Upto Oy | Wholesale & retail | 2023 |
| Urheilu Honkajuuri Ky | Wholesale & retail | 1987 |
| Urheiluvalmennus AK-Talli Oy | Education | 2018 |
| Urho Safety Group Oy | Professional & scientific | 2003 |
| Urstrong Oy | Hospitality | 2019 |
| Usavel Jewelry Oy | Manufacturing | 2025 |
| Uudenmaan kotiapu Oy | Administrative & support | 2018 |
| Uuttuvoima Oy | Energy | 2024 |
| V-P Jyrkinen oy | Wholesale & retail | 2000 |
| V2-Tech Oy | Construction | 2016 |
| VA Sales Oy | Wholesale & retail | 2026 |
| VAIT Group Oy | Administrative & support | 2017 |
| VENI Energia Oy | Professional & scientific | 2017 |
| VESI Water of Finland Oy | Water & waste | 2012 |
| Vip Cafe OY | Hospitality | 2026 |
| VJ-Konsultointi Oy | Professional & scientific | 2003 |
| VMD Brand OY | Wholesale & retail | 2017 |
| VMS Marketing Ltd Oy | Wholesale & retail | 2024 |
| VP-Tekoniemi Oy | Manufacturing | 2015 |
| VSi Invest Oy | Financial services | 2020 |
| VV Infra Oy | Construction | 2015 |
| Vaappu Investment Oy | Financial services | 2008 |
| Vaaran Pojat Oy | Wholesale & retail | 2016 |
| Vaateputiikki Jasmiina Oy | Wholesale & retail | 2018 |
| VaihtoVaunu Oy | Wholesale & retail | 2023 |
| Vaikka&Mitä second hand Oy | Wholesale & retail | 2023 |
| Vakuutuspalvelut Aki Ruuskanen Oy | Financial services | 2026 |
| Valhalla Consulting Oy | Construction | 2011 |
| Valid Oy | Information & communication | 1984 |
| ValioNainen Oy | Health & social care | 2022 |
| Valkeakosken Muodin Maailma Oy | Wholesale & retail | 1994 |
| Valmustia Oy | Wholesale & retail | 2023 |
| Vanain Kiinteistö Oy | Construction | 1989 |
| Vanaja AI Oy | Information & communication | 2026 |
| Vanaja Boulder Oy | Arts & recreation | 2023 |
| Vanaja Holdings Oy | Financial services | 2025 |
| Vanaja Medical Oy | Health & social care | 2023 |
| Vanaja Technologies Oy | Information & communication | 2019 |
| Vanaja Wake Oy | Arts & recreation | 2021 |
| Vanajan Hallit Oy | Real estate | 2021 |
| Vanajan Keksit Oy | Manufacturing | 2000 |
| Vanajan Kiinteistöt Oy | Real estate | 2007 |
| Vanajan Laki Oy | Professional & scientific | 1996 |
| Vanajan Liikehuoneistot Oy | Real estate | 1993 |
| Vanajantie Hallit Oy | Real estate | 2022 |
| Vanhankaupungin Sauna Oy | Real estate | 2007 |
| Vantaan Pörssisijoitus Oy | Financial services | 1987 |
| Vaqtus Oy | Financial services | 2018 |
| Varaosa Piste Oy Hämeenlinna | Wholesale & retail | 2019 |
| Varastointi Tunturi Oy | Transport & logistics | 2005 |
| Varma Aktiviteettipalvelu Oy | Arts & recreation | 2024 |
| Vauhtila Oy | Real estate | 2023 |
| Vehmatek Oy | Construction | 2017 |
| Veikkola Advisory Oy | Administrative & support | 2024 |
| Vekka Capital Oy | Real estate | 2001 |
| Vekka Invest Oy | Administrative & support | 1988 |
| Veljekset Ylhäinen Oy | Professional & scientific | 1994 |
| Verkatehdas Oy | Arts & recreation | 2006 |
| Vermét Design Oy | Professional & scientific | 2020 |
| VersaWild Oy | Professional & scientific | 2026 |
| Verso Kiinteistöt Oy Lkv | Real estate | 2022 |
| VetTiiMi Oy | Professional & scientific | 2013 |
| Vicmar Oy | Financial services | 2018 |
| Viestintätoimisto Pellinen Ruusunen Ojala Oy | Professional & scientific | 2002 |