| Blikkenslager Werner Kjos AS | Staubø | 2015 |
| Blikkenslager Øystein Tesdal AS | Bolstadøyri | 2020 |
| BLIKKENSLAGER1 AS | Skåla | 2015 |
| Blikkenslageren AS | Ålesund | 1989 |
| Blikkenslageren Innlandet AS | Hunndalen | 2025 |
| Blikkenslagerfirma Nordengen AS | Skreia | 2018 |
| Blikkenslagerfirma Olaf Jahnsen AS | Kristiansand S | 1988 |
| Blikkenslageriet AS | Slemmestad | 2015 |
| Blikkenslagermester Brækstad AS | Klæbu | 2004 |
| Blikkenslagermester Even Helgesen AS | Ålesund | 1998 |
| Blikkenslagermester Jan Morten Ødegaard AS | Kristiansand S | 2015 |
| Blikkenslagermester Karl Flisram AS | Hauglandshella | 2022 |
| Blikkenslagermester Lars Eriksen AS | Oslo | 2018 |
| Blikkenslagermester Leif Hansen AS | Kristiansand S | 2020 |
| Blikkenslagermester Tormod Gretteberg AS | Holmestrand | 2023 |
| Blikkenslagermester Vidar Hansen AS | Ramnes | 2017 |
| Blikkenslagermesteren Entreprenør AS | Oslo | 2010 |
| Blikkenslagermesterne AS | Oslo | 2026 |
| Blikkenslagermestrene Henry Hansen & Sønn AS | Oslo | 1966 |
| Blikkenslagern AS | Dokka | 2025 |
| Blikkenslagerne AS | Steinberg | 2021 |
| Blikkenslagerservice AS | Trondheim | 2014 |
| Blikkenslagerservice Strøm AS | Andenes | 2014 |
| Blikkenslagerverksted Olsen Ans | Skjeberg | 2010 |
| Blikkgutta AS | Svensby | 2023 |
| Blikkhjørnet AS | Øvre Årdal | 2002 |
| Blikki AS | Figgjo | 2025 |
| Blikkmester AS | Levanger | 2025 |
| Blikra & Søderblom AS | Østerås | 1995 |
| Bliks Holding AS | Oslo | 2023 |
| Blikås Elektro AS | Førde | 2012 |
| Blindheim Maskin & Transport AS | Ålesund | 1997 |
| Blindheim Maskin AS | Ålesund | 2021 |
| Blindheim Service AS | Ytre Arna | 2023 |
| Blindleia Skifer Og Utemiljø AS | Høvåg | 2023 |
| Blink Hus Dale Malo AS | Elnesvågen | 1989 |
| Blink Hus Sigdal AS | Krokstadelva | 1985 |
| Blink Hus Songdalen AS | Nodeland | 1980 |
| Blinkhus Sørvest AS | Stavanger | 2009 |
| Blitzgips AS | Rådal | 2025 |
| Blix Bygg AS | Skollenborg | 2022 |
| Blix Byggefirma AS | Lillesand | 2018 |
| Blix Datagulv AS | Nesbru | 2011 |
| Blix Holding & Invest AS | Skollenborg | 2025 |
| Blix Holding AS | Skollenborg | 2022 |
| Blix Trefiberisolering AS | Skollenborg | 2022 |
| Blocktech Tomasz Lenartowicz | 20-209 Poczta Lublin | 2019 |
| Blokktinden Eiendom AS | Tjongsfjorden | 2016 |
| Blom Byggservice AS | Ankenes | 2010 |
| Blom Mur Og Byggservice AS | Ytre Arna | 2020 |
| Blommenholm Hageservice AS | Vøyenenga | 2023 |
| Blommenholm Terrasse AS | Oslo | 2020 |
| Blomquist Glass AS | Larvik | 2024 |
| Blomsterdalen Bil Og Byggservice AS | Blomsterdalen | 2020 |
| Blomstring AS | Godvik | 2012 |
| Blomsøy Maskin AS | Sandnessjøen | 2002 |
| Blu Electro AS | Stavanger | 2020 |
| Blue King Maciej Maziarz | Pl36-002 Jasionka | 2023 |
| Blue Tern AS | Oslo | 2019 |
| Blue Tern Holding AS | Oslo | 2019 |
| Blue Tern Operations AS | Oslo | 2019 |
| Blue Tomato Finland OY | Fi-00130 Helsinki | 2021 |
| Blue Uk-Invest Nuf | London W1W 7Lt | 2018 |
| Blueberry Builders AS | Oslo | 2022 |
| Bluecliff Holding AS | Kvinesdal | 2021 |
| Bluefront IV Topco AS | Oslo | 2022 |
| Bluetec AS | Tønsberg | 2016 |
| Bluetech VVS AS | Svelvik | 2020 |
| Bluewave Solar AS | Oslo | 2023 |
| Blume-Rollen GmbH | De-42477 Radevormwald | 2023 |
| Blumer Lehmann AG | Oslo | 2015 |
| BLW Holding AS | Bergen | 2023 |
| Blystad Elektro AS | Hamar | 2018 |
| Blystad Vei Og Vedlikehold AS | Espa | 2023 |
| Blytt Energi Og Klima Konsult Ans | Rådal | 2001 |
| Blå Ledning AS | Oslo | 2020 |
| Blåbyen Byggservice AS | Sortland | 2015 |
| Blådalen Eiendomsutvikling AS | Paradis | 2011 |
| Blåfjell Maskin AS | Eidsnes | 2013 |
| Blåhella Holding AS | Tranby | 2015 |
| Blåhø Elektro AS | Lalm | 2015 |
| Blåhø VVS AS | Vågå | 2015 |
| Blåklokke Eiendom AS | Tangen | 2024 |
| Blåmann Bygg AS | Kvaløya | 2017 |
| Blåmann Maskin AS | Kvaløya | 2013 |
| Blåne AS | Fåvang | 2014 |
| Blås AS | Vartdal | 2024 |
| Blåseiso AS | Trondheim | 2021 |
| Blåseisolasjon AS | Jevnaker | 2013 |
| Blåseisolering AS | Larvik | 2023 |
| Blåseisolering Sør AS | Lillesand | 2015 |
| Blåsepartner AS | Storsteinnes | 2025 |
| Blåsmo Elektro AS | Sandstad | 2007 |
| Blåsmo Gruppen AS | Orkanger | 2021 |
| Blåstjerna 8 AS | Dale I Sunnfjord | 2026 |
| Blåvann VVS AS | Skiptvet | 2025 |
| Blænes Bygg AS | Vestre Vinnesvåg | 2003 |
| Blære Smede Og Maskinværksted | Dk-9600 Aars | 2011 |
| Blø Bygg AS | Midsund | 1992 |
| Blørstad AS | Holum | 2018 |