| Bryneguiden AS | Bryne | 2026 |
| Brynjar Aarnseth AS | Åsen | 2012 |
| Brådland Eiendom AS | Mandal | 2013 |
| Bråge Persson Car Leasing AS | Vormsund | 2012 |
| Bråkmakar AS | Jondal | 2022 |
| Brødra Da | Lillehammer | 2026 |
| Brødrene Andersen Stillasutleie AS | Porsgrunn | 1999 |
| Brødrene Echroll AS | Tromsø | 2019 |
| Brødrene Fallmyr AS | Inndyr | 2025 |
| Brødrene Finstad AS | Harstad | 2014 |
| Brødrene Hegre | Sandnes | 1995 |
| Brødrene Helland Eiendom AS | Tau | 2020 |
| Brødrene Hetland AS | Hellvik | 2021 |
| Brødrene Jenssen AS | Sjøvegan | 2020 |
| Brødrene Jørmeland Eiendom AS | Hjelmeland | 1998 |
| Brødrene Koteng AS | Holmestrand | 2012 |
| Brødrene Kverneland Invest AS | Stavanger | 2015 |
| Brødrene Lindberg AS | Torp | 2026 |
| Brødrene Megårds Kramgoa Vintage Backline Da | Charlottenlund | 2020 |
| Brødrene Myrseth AS | Nesttun | 2016 |
| Brødrene Ringen AS | Koppang | 2023 |
| Brødrene Staddeland AS | Lyngdal | 2013 |
| Brødrene Steinsli AS | Fluberg | 2024 |
| Brødrene Storås AS | Fannrem | 2011 |
| Brødrene Øvstegård AS | Ørsta | 2020 |
| Brøgga Invest AS | Frei | 2018 |
| Brønlund/Jonassen Ans | Steinkjer | 2003 |
| Brønnbåt Nord Management AS | Engenes | 2017 |
| Brønnøy Aviation AS | Brønnøysund | 2018 |
| Brøyt Fauske AS | Fauske | 2023 |
| Brøyte & Hyttehjelp AS | Alta | 2020 |
| Brøyte Og Hytteservice AS | Geilo | 2023 |
| Brøyte-Service AS | Kristiansand S | 2014 |
| Brøyteren AS | Kristiansand S | 2024 |
| Brøytesamvirket Nordfjellstølen SA | Etnedal | 2019 |
| Brøytetjeneste Tromsdalen AS | Tomasjord | 2023 |
| Brøyting Og Graving AS | Hammerfest | 2025 |
| Brøytivei AS | Oslo | 2023 |
| BS Bemanning AS | Paradis | 2019 |
| BS Drift & Service AS | Nittedal | 2025 |
| BS Everest AS | Oslo | 2022 |
| BS Investeringsselskap AS | Skedsmokorset | 2015 |
| BS Medie AS | Moss | 2024 |
| BS Multidrift AS | Karasjok | 2025 |
| BS Service AS | Hegra | 2023 |
| Bsa Maritime AS | Laksevåg | 2018 |
| Bsa Offshore AS | Laksevåg | 2010 |
| BSB Holding AS | Jaren | 2019 |
| BSD Holding AS | Fauske | 2021 |
| Bsecure AS | Oslo | 2012 |
| BSG - Maskin AS | Hønefoss | 2018 |
| BSG Event AS | Fagerstrand | 2023 |
| BSR & Co LLP | Mumbai - 400011 Maharashtra | 2020 |
| BT Guin AS | Beitstad | 2017 |
| BT Malta I Ltd Nuf | Stj1861 St Julian'S | 2024 |
| BT Management AS | Kleppestø | 2010 |
| BT Maskin AS | Bodø | 2024 |
| BT Rental AS | Skogsvåg | 2024 |
| Bta Florø AS | Florø | 2018 |
| BTB Consult Aps | Dk-2670 Greve | 2020 |
| Bto Service AS | Trysil | 2017 |
| BTV Bygdeservice SA | Nesflaten | 2016 |
| BTV Consulting Vanvik AS | Stavanger | 2014 |
| Btvaktmester AS | Lier | 2016 |
| Bty AS | Oslo | 2024 |
| Bu-Ok AS | Otta | 2023 |
| Buchan Technical Services Ltd | Aberdeenshire Ab51 0Ez | 2000 |
| Buchen Tank- and Turnaroundservice GmbH | De-50735 Köln | 2017 |
| Buchen Umweltservice GmbH | De-5073 Koeln | 2016 |
| Bucher Municipal | Dk-8600 Silkeborg | 2012 |
| Budor Hytteservice AS | Løten | 2019 |
| Bue Fix AS | Kristiansand S | 2026 |
| Buer Anlegg AS | Tønsberg | 2024 |
| Buer Hjelpeselskap AS | Larvik | 2022 |
| Buer Travels OY Nuf | Fi-01490 Vantaa | 2026 |
| Buersvingen 7 AS | Askim | 2026 |
| Buffé Da | Tolvsrød | 2024 |
| Bugbytes AS | Oslo | 2012 |
| Bugsertjeneste IV AS | Haugesund | 1998 |
| Bugsertjeneste V AS | Haugesund | 2026 |
| Build Your Dreams Ålesund AS | Hovdebygda | 2026 |
| Buildrespect AS | Godvik | 2025 |
| Buildry AB | Oslo | 1995 |
| Bukken Og Havresekken Da | Oslo | 1997 |
| Buldre Event AS | Sørumsand | 2021 |
| Bull Drift AS | Krokkleiva | 2017 |
| Bull Productions AS | Nesttun | 2020 |
| Bull Trans AS | Tjelta | 2022 |
| Bulldogs Jetski AS | Slattum | 2025 |
| Bulldozer Maskinlag Verksted AS | Sortland | 2005 |
| Bullseye Consulting Ans | Gressvik | 2005 |
| Bullwinkle AS | Lommedalen | 2016 |
| Bumblebee Solutions AS | Longyearbyen | 2023 |
| Bunker AS | Silsand | 2020 |
| Bunor Maskin Utleie AS | Grimstad | 2022 |
| Bureau UK Recruitment Limited | Hull Hu2 8Hu | 2013 |
| Burger Bros AS | Oslo | 2022 |
| Burgundy Life AS | Sandnes | 2024 |
| Buri Norsk Skadedyrkontroll AS | Stavern | 2020 |
| Burmo Anleggsgartneri AS | Hvalstad | 2013 |