| Oy Vassvik Ab | Professional & scientific | 2000 |
| Oy Vean Group Ab | Health & social care | 1990 |
| Oy Velomix Ab | Wholesale & retail | 2013 |
| Oy Velotrade Finland Ltd | Wholesale & retail | 1992 |
| Oy Velsco Ab | Financial services | 1982 |
| Oy Velvet Concept Design Ab | Professional & scientific | 2002 |
| Oy Vendatekno Ab | Manufacturing | 1990 |
| Oy Vesterinen Ab | Real estate | 1979 |
| Oy Vestri Ab | Information & communication | 2012 |
| Oy ViaCon Ab | Manufacturing | 1994 |
| Oy Victia Ltd Ab | Professional & scientific | 2011 |
| Oy Victocons Ltd | Professional & scientific | 2001 |
| Oy Vida Terapia Ab | Health & social care | 2026 |
| Oy Video Flash Ltd | Information & communication | 1990 |
| Oy Viipurin Valokuvaamo Ab | Arts & recreation | 2019 |
| Oy Villa Kälkestad Ab | Real estate | 1969 |
| Oy Villamalia Ab | Hospitality | 2022 |
| Oy Villas Ab | Real estate | 1958 |
| Oy Vindirekt Finland Ab | Wholesale & retail | 1998 |
| Oy Vinolentus Ab | Other services | 1995 |
| Oy Vinski Kasinonranta Ab | Hospitality | 2019 |
| Oy Visual Power Ltd | Information & communication | 1987 |
| Oy Vivendia Ab | Wholesale & retail | 2011 |
| Oy Voikukko Industries Ab | Financial services | 2024 |
| Oy Voimavaunu Ab | Administrative & support | 2010 |
| Oy Voittovinst Ab | Financial services | 2025 |
| Oy Vorontsoff Ab | Financial services | 1986 |
| Oy Vuorikatu 3 Ab | Real estate | 1919 |
| Oy Vurm Ab | Professional & scientific | 1990 |
| Oy Våld Invest Ab | Financial services | 2006 |
| Oy WFJ-Honbu Ltd. | Arts & recreation | 1981 |
| Oy WM Label Ltd | Wholesale & retail | 2012 |
| Oy WT-Parketti Ab | Construction | 1984 |
| Oy Wagner Consulting Ab | Professional & scientific | 2006 |
| Oy Walhalla Sports Management Ab | Professional & scientific | 2011 |
| Oy Water Sound Ltd | Professional & scientific | 2019 |
| Oy Wave's Group Ltd | Professional & scientific | 1996 |
| Oy Websmart Ab | Wholesale & retail | 2007 |
| Oy Wega-Product Ab | Wholesale & retail | 1989 |
| Oy Welander & Welander Ab | Construction | 1992 |
| Oy Weldforce Ltd. | Administrative & support | 2009 |
| Oy Wellbeing Apartments | Real estate | 2019 |
| Oy Welnesor Ab | Financial services | 1980 |
| Oy Weltall Ab | Professional & scientific | 1989 |
| Oy Wennerco Ab | Wholesale & retail | 1976 |
| Oy West Company Helsinki Ltd. | Professional & scientific | 1996 |
| Oy White Dress Ab | Wholesale & retail | 2021 |
| Oy White Sea Ltd | Transport & logistics | 2009 |
| Oy Widagri Consultants Ab | Professional & scientific | 1987 |
| Oy Wideri Ab | Professional & scientific | 1997 |
| Oy Wild Edibles Ab | Information & communication | 2019 |
| Oy Wincom Ab | Wholesale & retail | 2000 |
| Oy Winecellars Ab | Transport & logistics | 1989 |
| Oy Winital S.p.a. | Wholesale & retail | 1993 |
| Oy Wirgot Ab | Real estate | 1995 |
| Oy Wixplan Ab | Professional & scientific | 1984 |
| Oy Wo Man & Ny Man Ab | Real estate | 2015 |
| Oy Wolff Productions Ab | Information & communication | 2010 |
| Oy Wolfram Ab | Financial services | 1987 |
| Oy Woofy Dog Products Ab | Wholesale & retail | 2023 |
| Oy Wortexport Ltd | Professional & scientific | 2019 |
| Oy Wynn Ab | Information & communication | 2019 |
| Oy Xiting Marketing Ab | Professional & scientific | 1989 |
| Oy Xmare Ab | Transport & logistics | 2008 |
| Oy Yes Box Ab | Professional & scientific | 1989 |
| Oy Ykkös Palkinto Mc EPP Ab | Wholesale & retail | 1996 |
| Oy Yoldia Ab | Financial services | 1985 |
| Oy Your Special Delivery Service Finland Ab | Transport & logistics | 2011 |
| Oy Ysi-Holding Ab | Financial services | 1987 |
| Oy Z-Trading Ltd | Information & communication | 1985 |
| Oy Zariba Ab | Education | 2016 |
| Oy Zax Ab | Financial services | 1999 |
| Oy Zen Investment Ab | Financial services | 2007 |
| Oy mindU Ab | Professional & scientific | 2024 |
| Oy mindclip Ab | Financial services | 2015 |
| Oy symboLink Ab | Information & communication | 1983 |
| Oy Å Holding Ab | Real estate | 2012 |
| Oy Åstrand Consulting Ab | Professional & scientific | 2023 |
| Oy Österlund-Line Ab | Administrative & support | 1990 |
| Oy. Blylod Ab | Real estate | 1956 |
| Oyster HR Finland OY | Professional & scientific | 2021 |
| Oü Anidar, Suomen Sivuliike | Transport & logistics | 2010 |
| OÜ Avanti Ehitus, Suomen sivuliike | Construction | 2013 |
| OÜ Devar Kids, sivuliike Suomi | Information & communication | 2016 |
| OÜ Ilustuudio With Love sivuliike Suomessa | Other services | 2013 |
| OÜ Mamako sivuliike Suomessa | Construction | 2007 |
| OÜ Maru Betoonitööd, Suomen sivuliike | Construction | 2012 |
| OÜ ROMRAKENNUS sivuliike Suomessa | Construction | 2022 |
| Oü Calculator suomen sivuliike | Construction | 2012 |
| Oü Nutifon Suomen sivuliike | Information & communication | 2013 |
| P & G Legal Advisors Ltd Oy | Wholesale & retail | 1996 |
| P & H Messo Oy | Other services | 1995 |
| P & K Myynti Oy | Wholesale & retail | 1992 |
| P & M Group Oy | Education | 2020 |
| P & N Ekegren Oy | Wholesale & retail | 2005 |
| P & N Siivous Oy | Administrative & support | 2024 |
| P & P Clothing Ky | | 1992 |
| P & P Kone- ja Kuljetus Oy | Transport & logistics | 2020 |
| P & P Laamanen Avoin yhtiö | Education | 2011 |
| P R Vesisuunnittelu Oy P R Water Consulting Ltd | Professional & scientific | 1998 |