| Tilitoimisto Roihu Oy | Professional & scientific | 2016 |
| Timanttimestarit Oy | Construction | 2024 |
| Timanttipurku Oy | Construction | 1992 |
| Timanttityö Syri Oy | Construction | 2019 |
| Timcraft Oy | Agriculture & fishing | 1995 |
| Timo Peltola Consulting Oy | Transport & logistics | 1996 |
| Timpuri Hautamäki Oy | Construction | 2017 |
| Tinkitie Records Avoin Yhtiö | Arts & recreation | 2023 |
| TinkyBell Oy | Administrative & support | 2015 |
| Titanor Oy | Mining & quarrying | 2025 |
| ToJaaLi Capital Oy | Professional & scientific | 2024 |
| Toivotut Osat Oy | Wholesale & retail | 2004 |
| Tomsson Oy | Manufacturing | 2022 |
| Tornadoc Oy | Health & social care | 2000 |
| Training For Eternity Oy | Education | 2018 |
| Transhouse Viitala Oy | Transport & logistics | 2011 |
| Treeni-Into Oy | Arts & recreation | 2018 |
| Trendihouse Oy | Other services | 2016 |
| Trädgårdscenter P Lindvall öppet bolag Puutarhakeskus P Lindvall avoin yhtiö | Wholesale & retail | 1995 |
| Tuhkunen Invest Oy | Financial services | 2025 |
| Tuholaistorjunta J.Huhtala Oy | Administrative & support | 2020 |
| Tuikkula Oy | Health & social care | 2002 |
| Tuliranta Oy | Real estate | 2007 |
| Tulisijamuuraus Saartoala Oy | Construction | 2015 |
| Tummu ja Tytär Oy | Hospitality | 2018 |
| Tunkkari Works Oy | Construction | 2022 |
| Tupex Ky | Wholesale & retail | 2015 |
| Tura Scandinavia AB, Filial i Finland | Wholesale & retail | 2000 |
| Turex Oy | Real estate | 1993 |
| Tuunaa Trading Oy | Wholesale & retail | 2024 |
| Twin Hills Capital Ab | Professional & scientific | 2026 |
| Tykotec Oy | Construction | 2019 |
| Tyllis Group Oy Ab | Administrative & support | 2021 |
| Tyllis Oy Ab | Manufacturing | 2008 |
| Työkumppanit osuuskunta | Administrative & support | 1997 |
| Työosuuskunta Reunapeukalo | Construction | 1999 |
| Työplus Oy | Health & social care | 2018 |
| Työplus Yhtiöt Oy | Health & social care | 2015 |
| Työstökoneliike M. Koskela Oy | Manufacturing | 2009 |
| Ukon Nova Ky | Hospitality | 1986 |
| Ullan Kylä Oy | Hospitality | 2015 |
| Umicore Battery Materials Finland Oy | Manufacturing | 2023 |
| Umicore Finland Oy | Manufacturing | 2013 |
| Upstorm Oy | Information & communication | 2022 |
| Uulos Oy | Financial services | 2021 |
| Variosport OY, Finland | Arts & recreation | 2025 |
| VD Events Oy | Arts & recreation | 2023 |
| VG Work Ab | Manufacturing | 2020 |
| VMO Ojanperä Oy | Real estate | 1989 |
| VNT Invest Oy | Real estate | 2024 |
| VOIMAksi Oy | Professional & scientific | 2023 |
| VP install Oy | Construction | 2022 |
| VVS J.Andersson Lvi Ky | Construction | 2013 |
| Vaahterus Investment Oy | Real estate | 2021 |
| Vaapputarvike J.Huhtala Oy | Manufacturing | 2012 |
| Vaasan BiitsiHalli Oy | Arts & recreation | 2026 |
| Vaasan Kiitokaari 7 Kiinteistö Oy | Real estate | 2007 |
| Vacaa Mentor Oy | Professional & scientific | 2017 |
| VakuutusVakka Oy | Financial services | 2008 |
| Vakuutuspalvelu VF Oy | Financial services | 2025 |
| Validoi Oy | Professional & scientific | 2013 |
| Valmia Oy | Education | 2008 |
| Valoisa Salko Oy | Hospitality | 2024 |
| Vanha Kippari Oy | Hospitality | 2015 |
| Vapauttava Oy | Health & social care | 2024 |
| Varmat Group Oy | Other services | 2023 |
| Vartuko Oy | Health & social care | 2015 |
| Varustekulma Oy | Wholesale & retail | 2022 |
| Vaser Oy | Professional & scientific | 2023 |
| Veli-Matti Jylhä Oy | Water & waste | 1996 |
| Velj. Kamula Oy | Construction | 2014 |
| Veljekset S & S Saarnisto Ravintola Pizzeria Angelo | | 1984 |
| Venetpalo Oy | Health & social care | 2024 |
| Veniz Oy | Manufacturing | 1993 |
| Verhoomo Alatalo Avoin Yhtiö | Other services | 2002 |
| Verranto Oy | Information & communication | 2024 |
| Vesein Group Oy | Wholesale & retail | 2020 |
| ViViAn Service Oy | Manufacturing | 2021 |
| Viac Holding Oy | Professional & scientific | 1995 |
| Viatronics Oy | Wholesale & retail | 1996 |
| Video Fakta Oy | Information & communication | 1993 |
| Videsten Oy Ab | Real estate | 2017 |
| Viestintätoimisto Mustaa valkoisella Oy | Professional & scientific | 2022 |
| Viestintätoimisto St. Hurmos Oy | Professional & scientific | 2006 |
| Viet Urban Oy | Hospitality | 2025 |
| Vihergroup Oy | Agriculture & fishing | 2022 |
| Vihertyö Seppä Oy | Administrative & support | 2012 |
| Viihdemestarit Oy | Professional & scientific | 2012 |
| Viihteellä Kokkola Oy | Professional & scientific | 2018 |
| Viittoen Oy | Professional & scientific | 2017 |
| Vikrent oy | Administrative & support | 2023 |
| Villa Rödsö Oy | Real estate | 2020 |
| Villaamo Oy | Education | 2019 |
| Villimango Oy | Other services | 2009 |
| Vilmore Oy | Financial services | 2023 |
| Vimida Oy | Financial services | 2012 |
| Vip Ideacompany Oy | Information & communication | 1996 |
| Vipecon-Invest Oy | Real estate | 2014 |
| Virtajuotos oy | Hospitality | 2018 |
| Virtel Oy | Financial services | 2024 |