| White Shadow Technologies Oy Ab Ltd | Porvoo | 2022 |
| White Winter Lapland Oy | Rovaniemi | 2025 |
| Whitech Oy | Jorvas | 2022 |
| Who's Next Oy | Helsinki | 2023 |
| WiB Women in Black Oy | Espoo | 2015 |
| Wice Solution Oy | Turku | 2023 |
| Wide-yhtiöt Oy Luusuaniemi | Saarenkylä | 1997 |
| WiiRENT Oy | Pori | 2007 |
| Wiimetippa Oy | Kulloonkylä | 2014 |
| Wiitapelto Oy | Seinäjoki | 1989 |
| Wiking Security Oy | Tuusula | 2009 |
| Wiklund & Solvin | Munsala | 2019 |
| Wikoland Oy | Valkeakoski | 2021 |
| Wild Ahoir Oy | Kangasala | 2022 |
| Wild Blueberry Experience Oy | Rovaniemi | 2018 |
| Wild Events Oy | Sirkka | 2008 |
| Wild Frame Adventures Oy | Espoo | 2025 |
| Wild Husky Rovaniemi Oy | Hirvas | 2021 |
| Wild Kemijoki Huskies Oy | Alakylä | 2024 |
| Wild Nordic Nature Oy | Pori | 2015 |
| Wild Out avoin yhtiö | Kuusamo | 2021 |
| Wild Salmon Adventures kommandiittiyhtiö | Karigasniemi | 2004 |
| Wild of lapland forest Oy | Vanttauskoski | 2025 |
| WildFinn Travel Agency Oy | Kempele | 2021 |
| Wilder Oy | Porvoo | 2009 |
| Wilderness Resort Oy | Rovaniemi | 2024 |
| Wilderness Safaris Saariselkä Oy | Saariselkä | 2015 |
| Wildgreenfinland Oy | Espoo | 2016 |
| Wilhelm & Son Oy | Sääksjärvi | 2021 |
| Wilille Oy | Kalkkiranta | 1991 |
| Willen Jahdit Oy | Kerkonjoensuu | 2005 |
| William international corporation Oy | Helsinki | 2015 |
| Willimies Finland Oy | Lappeenranta | 2024 |
| Willow-Tours Oy | Imatra | 2007 |
| Wilma & Co Oy | Hämeenlinna | 2023 |
| Wilu Ab | Lemland | 2018 |
| WinFi OY | Raisio | 2024 |
| Winclean Oy | Tampere | 2022 |
| Winclean Turku Oy | Turku | 2011 |
| WindSpeaker Oy | Kajaani | 2023 |
| Windrox Green Oy | Helsinki | 2014 |
| Windy Ears Oy | Saarenkylä | 2024 |
| Wingman Security Oy | Valkeakoski | 2021 |
| Wingroup Oy Ab | Helsinki | 2018 |
| Winister Oy | Helsinki | 2019 |
| Winona Finland Oy | Espoo | 2022 |
| Winter Blazing Sun Oy | Helsinki | 2020 |
| Winter Wonderland Oy Ltd | Ylitornio | 2019 |
| Winterfell Capital Oy | Helsinki | 2014 |
| Winterfun Oy | Kittilä | 2025 |
| Wintertestcenter Service Oy | Muonio | 2002 |
| Winzig Oy | Espoo | 2019 |
| Wiped Oy | Lempäälä | 2019 |
| Wippii Work Asiakaspalvelut Oy | Vantaa | 2021 |
| Wippii Work Henkilöstöpalvelut Oy | Vantaa | 2019 |
| Wippii Work Henkilöstöratkaisut Oy | Vantaa | 2022 |
| Wippii Work Logistiikka Oy | Vantaa | 2019 |
| Wippii Work Logistiikkaratkaisut Oy | Vantaa | 2021 |
| Wippii Work Oy | Vantaa | 2009 |
| Wippii Work Varastopalvelut Oy | Vantaa | 2021 |
| Wire Henkilöstöpalvelut Oy | Tampere | 2019 |
| WireStaff Helsinki Oy | Helsinki | 2021 |
| WireStaff Oy | Tampere | 2021 |
| Wise Rental Services Oy | Helsinki | 2017 |
| Wisematic RaaS Solutions Oy | Tampere | 2020 |
| Wiwo Partners Oy | Kuopio | 2022 |
| Wize Predators Oy | Orimattila | 2021 |
| Woikukka Oy | Espoo | 1975 |
| Woitokkaat Oy | Espoo | 2023 |
| Wolfbay Ltd Oy | Kuusamo | 1997 |
| Wolff Trading Oy | Helsinki | 1993 |
| Wolt Operations Oy | Helsinki | 2021 |
| Womandoo Oy | Helsinki | 1989 |
| Wonderboy Oy | Turku | 2015 |
| Wonderland of Lapland Oy | Maksniemi | 2021 |
| Wonderlapland Experiences Oy | Rovaniemi | 2022 |
| Wonderlust Travel Lapland Oy | Saarenkylä | 2022 |
| WoodMood Oy | Helsinki | 2012 |
| Wooden Group Oy | Nummela | 1998 |
| Woodlen Oy | Espoo | 2012 |
| Wopo Oy | Jyväskylä | 2022 |
| Work Done Oy | Osoite Tuntematon | 2024 |
| Work Hub Oy | Osoite Tuntematon | 2017 |
| Work Personal Oy | Espoo | 2019 |
| Work Point Mikkeli Oy | Mikkeli | 2002 |
| Work and Ski Oy | Helsinki | 2022 |
| Work goes happy Oy | Helsinki | 2015 |
| Work4You Osk | Tampere | 2023 |
| WorkBuddy Oy | Helsinki | 2021 |
| WorkPartners Finland Oy | Helsinki | 2021 |
| WorkPeople Group Oy | Espoo | 2018 |
| WorkPeople HoReCa Oy | Espoo | 2020 |
| WorkRelax Oy Ab | Tammisaari | 2015 |
| WorkSmart Logistic Oy | Helsinki | 2022 |
| WorkUp osk. | Joensuu | 2019 |
| WorkWave Oy | Vantaa | 2024 |
| Workbana Oy | Hollola | 2023 |
| Worker Akatemia Oy | Oulu | 2022 |
| Worker Etelä-Suomi Oy | Helsinki | 2019 |
| Worker Henkilöstö- ja kehittämispalvelut Oy | Kankaanpää | 2020 |