| Backo Advisory Oy | Helsinki | 2021 |
| Backo Group Oy | Helsinki | 2020 |
| Backo Services Oy | Helsinki | 2020 |
| Backoffice Finland Oy | Lahti | 2022 |
| Backstrong Oy | Riihimäki | 2022 |
| Backwoods Husky Oy | Vanhala | 2018 |
| Baconhawk Consulting Helsinki Oy | Helsinki | 2014 |
| BadaBaljan Ab | Espoo | 2019 |
| Badmanner Consulting Oy | Espoo | 2019 |
| Bakker Consulting Oy | Vantaa | 2021 |
| BalancePlus Oy | Imatra | 2024 |
| Balanco Technologies Oy | Vantaa | 2025 |
| Balata Henkilöstöpalvelut Oy | Tampere | 2012 |
| Balitex Oy | Vantaa | 2021 |
| Balka Oy | Porvoo | 2023 |
| BaltScand Accounting Oy | Helsinki | 2022 |
| Baltic Aviation Oy | Parikkala | 2010 |
| Baltic Prima Yachting, Avoin yhtiö | Espoo | 2005 |
| Bam Palvelut Oy | Lempäälä | 2021 |
| BambooZ Oy | Vantaa | 2023 |
| Bamic Oy | Turku | 1981 |
| BanalOne Oy | Helsinki | 2020 |
| BankShot Finland Oy | Tampere | 2024 |
| Baraaryg Company Oy | Espoo | 2018 |
| Baran Palvelut Oy | Tampere | 2025 |
| Barasta Oy | Vantaa | 2014 |
| Barliman Infra Oy | Sotkamo | 2017 |
| Barodon avoin yhtiö | Espoo | 1992 |
| Barona Customer Services Oy | Helsinki | 2016 |
| Barona Finance Oy | Helsinki | 2016 |
| Barona Flexible Industries Oy | Helsinki | 2008 |
| Barona Global Human Resources Oy | Helsinki | 2020 |
| Barona HR Oy | Helsinki | 2016 |
| Barona Henkilöstöpalvelut Oy | Helsinki | 2006 |
| Barona HoReCa Oy | Helsinki | 1999 |
| Barona IT Oy | Helsinki | 2006 |
| Barona Industry Services Oy | Helsinki | 2016 |
| Barona Julkiset Palvelut Oy | Helsinki | 2023 |
| Barona Kauppa Oy | Helsinki | 2001 |
| Barona Lapland Oy | Rovaniemi | 2009 |
| Barona Logistiikan Ulkoistuspalvelut Oy | Vantaa | 2025 |
| Barona Logistiikka Oy | Vantaa | 2005 |
| Barona Logistiikkaratkaisut Oy | Vantaa | 2005 |
| Barona Logistiikkatyöntekijät Oy | Vantaa | 2025 |
| Barona Lounais-Suomi Oy | Turku | 2009 |
| Barona Palvelut Oy | Helsinki | 2023 |
| Barona Pohjanmaa Oy | Seinäjoki | 2011 |
| Barona Production Oy | Helsinki | 2006 |
| Barona Projektit Oy | Helsinki | 2005 |
| Barona Rakennus Oy | Helsinki | 2005 |
| Barona SCC East Oy | Helsinki | 2006 |
| Barona SCC North Oy | Helsinki | 2007 |
| Barona SCC North West Oy | Helsinki | 2010 |
| Barona SCC West Oy | Helsinki | 2007 |
| Barona Sales East Oy | Helsinki | 2013 |
| Barona Sales Fashion Oy | Helsinki | 2007 |
| Barona Sales North Oy | Helsinki | 2007 |
| Barona Sales Oy | Helsinki | 2016 |
| Barona Sales Retail Oy | Helsinki | 2007 |
| Barona Sales Services Oy | Helsinki | 2014 |
| Barona Sales South Oy | Helsinki | 2007 |
| Barona Sales South West Oy | Helsinki | 2011 |
| Barona Sales Trading Oy | Helsinki | 2006 |
| Barona Sales West Oy | Helsinki | 2010 |
| Barona Sisä-Suomi Oy | Tampere | 2008 |
| Barona Sisälogistiikkaratkaisut Oy | Vantaa | 2025 |
| Barona Sote Oy | Helsinki | 2020 |
| Barona Tekniikka & Asennus Oy | Helsinki | 2015 |
| Barona Teollisuus Oy | Helsinki | 2005 |
| Barriendo Oy | Turku | 2021 |
| Bartasom osk | Helsinki | 2026 |
| Bartolomina Oy | Kaarina | 2025 |
| Baruuj Oy | Helsinki | 2025 |
| Base It Oy | Espoo | 2021 |
| BaseOn Oy | Lempäälä | 2009 |
| BaseReipas Oy | Haukipudas | 2021 |
| Baseflow Oy | Jääli | 2020 |
| Baseq Oy | Saarenkylä | 2017 |
| BassoHR Oy | Lahti | 1991 |
| Basthill Ky | Lappeenranta | 2014 |
| Bastista Oy | Niittylahti | 2021 |
| Bastö Andrum Ab | Pålsböle | 2011 |
| Bato Oy | Helsinki | 2025 |
| Batta Oy | Espoo | 1992 |
| Batticaloa Oy | Klaukkala | 2019 |
| Bay City Sailing Oy | Lahti | 2014 |
| Be My Hero-Finland Oy | Vihti | 2025 |
| Be U Work Oy | Siuro | 2020 |
| Be Wild in Finland Ky | Puolanka | 2001 |
| Beacon Air Traffic Solutions Oy | Pyhtää | 2021 |
| Beacon Remote Tower Technologies Oy | Pyhtää | 2021 |
| Beamlaser Oy | Pori | 2025 |
| Bearfort Oy | Pori | 1997 |
| Beato Oy | Poikelus | 2008 |
| Beatus Abstersus Oy | Rovaniemi | 2024 |
| Beaufort Marketing Procurement Oy | Box | 2013 |
| Beauty Power Oy | Helsinki | 2015 |
| Bee Line Services avoin yhtiö | Vantaa | 2017 |
| Beebox Oy | Helsinki | 2014 |
| Beekmann Company AB | Loviisa | 2015 |