| Työkalugroup Oy | Wholesale & retail | 2010 |
| Työkone Koiviston tiiveysrakentaminen Oy | Construction | 2008 |
| Työn Sankarit Osuuskunta | Administrative & support | 2019 |
| Työstö Group Oy | Manufacturing | 2019 |
| Työtoveri Oy | Construction | 2018 |
| Tähti&Kuu Books Oy | Information & communication | 2021 |
| Täk Oy | Administrative & support | 2021 |
| Tänne Jää Long Life Limited Oy | Financial services | 2001 |
| Täsmärekry Oy | Administrative & support | 2023 |
| Törönen & Kumppanit Oy | Professional & scientific | 2010 |
| UA Huolto Oy | Other services | 2020 |
| UAB SB SERVICE, Suomen sivuliike | Construction | 2016 |
| UES Oy | Professional & scientific | 2021 |
| UG Solutions Oy | Information & communication | 2017 |
| UMCK Group Oy | Wholesale & retail | 2024 |
| UMSA UudenMaanSukellusAkatemia Oy | Education | 2022 |
| Uniun OY | Wholesale & retail | 2012 |
| Urjalan Kuljetus Ja Kyyti OY | Transport & logistics | 2020 |
| USM hinaus Oy | Other services | 2022 |
| UScan Oy | Education | 2023 |
| Udraiv Oy | Information & communication | 2017 |
| Ugly Cookie Oy | Manufacturing | 2019 |
| Ukin Haikara Oy | Manufacturing | 2026 |
| Ukkohalla Inn Oy | Hospitality | 2019 |
| Ultimate Audio Oy | Wholesale & retail | 2011 |
| Ulvas & Aalto Oy | Arts & recreation | 2018 |
| Ulvilan Lintumetsä Oy | Real estate | 2010 |
| Ulvilan Monitoimi Oy | Hospitality | 2006 |
| Umbrella Greenhouses Oy | Agriculture & fishing | 2019 |
| Umiko Oy | Professional & scientific | 2020 |
| Undiscovered Oy | Administrative & support | 2021 |
| Unfair Advantage Ltd Oy | Professional & scientific | 2007 |
| Unicum Trade Oy | Wholesale & retail | 2015 |
| Uniq Lux Oy | Wholesale & retail | 2006 |
| Univelat Oy | Real estate | 2020 |
| Unlimited Construction Company Oy | Construction | 2020 |
| Uong Hapattamo Oy | Manufacturing | 2020 |
| UpSteam Oy | Other services | 2019 |
| Upgrade Finland Oy | Administrative & support | 2021 |
| Uracom Oy | Administrative & support | 2020 |
| Urakka Lehtinen Oy | Construction | 2019 |
| UrakkaTaituri Oy | Construction | 2020 |
| Urakointi Team Kjelin Oy | Construction | 2011 |
| Urakointiseiska oy | Construction | 2022 |
| Urban Finance Oy | Professional & scientific | 2019 |
| Urban sales | Wholesale & retail | 2021 |
| Urbanfest Oy | Real estate | 2019 |
| Urbansoft Oy | Information & communication | 2021 |
| Urho Holding Oy | Professional & scientific | 2022 |
| Usvasta Oy | Hospitality | 2022 |
| Utelias soppi OY | Wholesale & retail | 2020 |
| Uttison Oy | Wholesale & retail | 2019 |
| Uudenmaan Hitsauspaja Oy | Construction | 2012 |
| Uudenmaan Huoneistoremontti Oy | Construction | 2023 |
| Uudenmaan Kuljetus Center Oy | Transport & logistics | 2020 |
| Uudenmaan Oviasennus Oy | Construction | 2018 |
| Uudenmaan Rakennus ja Muuraus Oy | Construction | 2003 |
| Uudenmaan Rakentajat & Maalarit Oy | Construction | 2024 |
| Uudenmaan Saneeraus ja Rakennus Oy | Construction | 2021 |
| Uudenmaan Yrityskiinteistöt Oy | Real estate | 1997 |
| Uusimaa Car Oy | Wholesale & retail | 2022 |
| UusioDuo Oy | Construction | 2020 |
| Uutturova Oy | Real estate | 1990 |
| V Taksi Oy | Transport & logistics | 2018 |
| V&V import Oy | Wholesale & retail | 2020 |
| V-M Välimaa Oy | Arts & recreation | 1995 |
| V.E. Kiinteistö Invest Oy | Real estate | 2009 |
| Va Grupp OY | Construction | 2021 |
| VAGAUTOPESU-KORJAAMO Oy | Other services | 2023 |
| VANAYA Oy | Arts & recreation | 2022 |
| Vator OY | Manufacturing | 2022 |
| VG Bistro Oy | Hospitality | 2019 |
| Vikvil Service OY | Construction | 2022 |
| VISM Oy | Administrative & support | 2015 |
| Vitium OY | Information & communication | 2007 |
| VJK-Service Oy | Construction | 2017 |
| VK Autohuolto Oy | Other services | 2022 |
| VK-Sähkö Oy | Construction | 2007 |
| VKP Entertaiment Oy | Professional & scientific | 2024 |
| VL Kone- ja Kiinteistöpalvelu Oy | Real estate | 2007 |
| VLAKOSTA Oy | Construction | 2019 |
| VLK-erikoistyöt Oy | Construction | 2017 |
| VMJ Group Oy | Real estate | 2019 |
| VMove Oy | Arts & recreation | 2019 |
| VOYZ Oy | Other services | 2018 |
| VR Rakennus OY | Real estate | 2013 |
| VR Ravintolamaailma Oy | Information & communication | 2020 |
| VT Core Oy Uusimaa | Professional & scientific | 2021 |
| VTmaalaus Oy | Manufacturing | 2020 |
| VV Rakennustekniikka Oy | Construction | 2022 |
| VV Suomi Oy | Construction | 2021 |
| VV-Yhtiöt Oy | Wholesale & retail | 2022 |
| Vaaka Foods Oy | Manufacturing | 2022 |
| Vaanted Oy | Wholesale & retail | 2020 |
| Vaara-Karjalan Kotipalvelu Oy | Health & social care | 2016 |
| Vaasa IN marketing Oy Ab Ltd | Other services | 2022 |
| Vaasan Teollisuus Rakennus Oy | Construction | 2015 |
| Vaasan Trokaripoppoo Oy | Administrative & support | 1987 |
| Vacaa Entertainment Oy | Administrative & support | 2018 |
| Vahtisten Lämpö Oy | Energy | 1981 |