| Turner nosto-ovet Oy | Construction | 2006 |
| Turner-Door Oy | Wholesale & retail | 1990 |
| Turvanen Oy | Construction | 2013 |
| Tuulilaukka Oy | Real estate | 1998 |
| Tyngän Kone Oy | Wholesale & retail | 2009 |
| U.T.A. Finland Oy | Professional & scientific | 2025 |
| UbboTuggi Oy | Wholesale & retail | 2024 |
| Ukrainalainen Apulainen Oy | Hospitality | 2023 |
| Ultra-Funktio Oy | Health & social care | 1987 |
| Untisen Turkistarha Avoin yhtiö | Agriculture & fishing | 1996 |
| Urakointiasennus M.Rautio Oy | Manufacturing | 2012 |
| Urheiluliike Esko Rautio & Kumpp. | Wholesale & retail | 1958 |
| Uusi Siipola Oy | Agriculture & fishing | 2023 |
| V-Kasi Oy | Hospitality | 2026 |
| VJ Anttila Oy | Health & social care | 2021 |
| VLA-Marketing Oy | Professional & scientific | 1990 |
| VM Oja Oy | Hospitality | 2023 |
| VP Mounting Oy | Manufacturing | 2015 |
| VS Meinala Oy | Real estate | 2017 |
| Valmennuskumppani Heini Salmu Oy | Professional & scientific | 2010 |
| Valula Group Oy | Professional & scientific | 1988 |
| Vasankarin asennus Oy | Manufacturing | 2024 |
| Veljekset Haapakangas Oy | Construction | 1993 |
| Veljekset Simonen Oy | Real estate | 2015 |
| Velmo Oy | Administrative & support | 2007 |
| Vesi ja Lämpö Niemelä Oy | Construction | 1996 |
| Vieskatar Ky | | 1989 |
| Vihermikot Konekauppa Oy | Wholesale & retail | 2026 |
| Ville Suorsa Photography Oy | Professional & scientific | 2020 |
| Ville Vainio Oy | Construction | 2016 |
| Visapojat avoin yhtiö | Agriculture & fishing | 2012 |
| Visuell Beauty&Relax Oy | Other services | 2019 |
| Visuri & Paavola Oy | Construction | 2001 |
| Vivida Holding Oy | Professional & scientific | 2023 |
| Vuokravälitys Hiekkasärkät Oy | Real estate | 2022 |
| WeldOne Oy | Manufacturing | 2007 |
| Wesain Oy | Construction | 2010 |
| Wewill Oy | Manufacturing | 2017 |
| Willi Invest Oy | Real estate | 2026 |
| Willi Lakeus - teatteriosaajien osuuskunta | Arts & recreation | 2000 |
| Wood & Home Styling Oy | Real estate | 2022 |
| X Pakka Oy | Arts & recreation | 2008 |
| XperGeo Oy | Mining & quarrying | 2022 |
| helpper kalajoki oy | Administrative & support | 2021 |