| Balkongeksperten AS | Oslo | 2012 |
| Balkongentreprenøren AS | Bergen | 2009 |
| Balkongteam AS | Oslo | 1998 |
| Balkongteam Holding AS | Oslo | 2000 |
| Balkra AS | Årnes | 2022 |
| Ballangen Utvikling AS | Ballangen | 2019 |
| Ballestad Maskin AS | Lyngdal | 2014 |
| Ballstad Entreprenør AS | Valberg | 2010 |
| Balmoral Tanks Limited | Ab12 3Gy Aberdeen, Scotland | 2025 |
| Balnor Entreprenør AS | Lørenskog | 2023 |
| Balsfjord Elektro AS | Storsteinnes | 2018 |
| Balsfjord Rørservice AS | Storsteinnes | 2024 |
| Balsfjord Terminalen AS | Storsteinnes | 2018 |
| Balsnes Bygg AS | Nordfjordeid | 2021 |
| Balswick AS | Harstad | 2008 |
| Balten AS | Sperrebotn | 2014 |
| Baltic Bygg Nord AS | Sortland | 2012 |
| Baltic Ceilings Oü | Ee-Võru Maakond, 65606 | 2024 |
| Baltic Contracting Group Nuf | Lt-92223 Klaipeda | 2017 |
| Baltic Entrepreneurs | 263 22 Höganäs | 2003 |
| Baltic Hjem AS | Sellebakk | 2020 |
| Baltic Industrial Services Uab | Lt-92118 Litauen | 2015 |
| Baltic Oversea Services Uab Nuf | 93233 Klaipeda | 2013 |
| Baltik Expert Nuf | Lt-76210 Siauliai | 2022 |
| Baltland Nuf | Lt-92377 Mazuriskiu Vlg. | 2020 |
| Baltmax AS | Vinterbro | 2016 |
| Baltmax Holding AS | Vinterbro | 2021 |
| Baltmont AB Nuf | Oslo | 2018 |
| Baltrex AS | Rælingen | 2022 |
| Baltztek AS | Drøbak | 2015 |
| Bamble Rør AS | Stathelle | 1993 |
| Bamseveien Snekkerservice AS | Bodø | 2024 |
| Banach Mariusz Dom-Service | Pl-37 500 Jaroslaw | 2007 |
| Banair SP. Z.O.O. | Pl-10-381 Olsztyn | 2026 |
| Banay Eigedom AS | Øystese | 2017 |
| Bandbredd AS | Nordre Frogn | 2016 |
| Bane & Anlegg AS | Maura | 2012 |
| Bane & Elsikkerhet Trøndelag AS | Sørli | 2013 |
| Bane- Bygg AS | Borgenhaugen | 2023 |
| Baneanlegg AS | Notodden | 2023 |
| Banefjell AS | Tingvatn | 2014 |
| Banekompaniet AS | Skollenborg | 2025 |
| BANEREPP1 AS | Veblungsnes | 2011 |
| Baneservice AS | Oslo | 2003 |
| Baneservice AS Filial Sverige | 412 63 Gøteborg | 2010 |
| Banesupply & Vedlikehold AS | Karmsund | 2010 |
| Bang Bygg AS | Roverud | 2019 |
| Bang Elektro AS | Lillesand | 1989 |
| Bano Prefab AS | Sandane | 2018 |
| Banor Utvikling AS | Stabekk | 2021 |
| Bantos AS | Sandefjord | 2010 |
| Barakat Dykkertjenester AS | Kolltveit | 2024 |
| Barcken Bygg AS | Oslo | 2015 |
| Bardu Luftteknikk AS | Bardu | 2024 |
| Bardu Maskin AS | Bardu | 2007 |
| Bardu-Luftteknikk AS | Bardu | 2026 |
| Bardufoss Vaktmesterservice AS | Bardufoss | 2024 |
| Bare Bygg AS | Oslo | 2014 |
| Bare Male AS | Oslo | 2017 |
| Bare Rør & Service AS | Oslo | 2011 |
| Barents Holding AS | Tromsø | 2017 |
| Barents Industriservice AS | Kirkenes | 2026 |
| Barents-Klima AS | Vadsø | 2021 |
| Barentsbygg AS | Oslo | 2018 |
| Barentsholding AS | Oslo | 2019 |
| Bareror.No AS | Skien | 2017 |
| Barerør AS | Værøy | 2013 |
| Barest AS | Vadsø | 2005 |
| Barkedalen AS | Kråkerøy | 2018 |
| Barkedalen Elektriske AS | Kråkerøy | 2023 |
| Barkenes AS | Flateby | 2015 |
| Barkenæs Entreprenør AS | Heidal | 2015 |
| Barkenæs Holding AS | Heidal | 2015 |
| Barkved Og Monsen AS | Stadlandet | 2021 |
| Barland Bygg AS | Sannidal | 2024 |
| Barland Holding AS | Sannidal | 2024 |
| Barlien AS | Bosberg | 2016 |
| Barm Bygg AS | Kråkerøy | 2022 |
| Barmen Bygg AS | Risør | 2012 |
| Barmen Bygg Og Vaktmester AS | Selje | 2017 |
| Barnholt Belysningsdesign AS | Oslo | 2013 |
| Barntjernmoen Holding AS | Jessheim | 2020 |
| Barona Human Resource Services AS | Drammen | 2014 |
| Barona Teknisk Installasjon AS | Drammen | 2021 |
| Barros & Martins - Consultoria E Servic Lda Nuf | 4590-612 Pacos De Ferreira | 2025 |
| Barseth AS | Vallersund | 2012 |
| Barsk Entreprenør AS | Storslett | 2013 |
| Barstad Maskin AS | Hauge I Dalane | 2014 |
| Barstrand AS | Fauske | 2012 |
| Bart Langeveld Allround Service | 1764Hs Breezand | 2026 |
| Bart Maling Gulvlegging AS | Eikangervåg | 2024 |
| Bartebygg AS | Trondheim | 2024 |
| Bartek Group Bartosz Pollum Nuf | 83-250 Skarszewy | 2016 |
| Barth Bygg AS | Narvik | 2015 |
| Barth Innenausbau KG Der Ivo Barth GmbH & Co | It-39042 Brixen | 2015 |
| Bartholet Maschinenbau AG | Ch-8890 Flums | 2018 |
| Bartlomiej Glubisz | Sylling | 2005 |
| Bartlomiej Majcherczyk | Pl-43100 Tychy | 2024 |
| Bartlomiej Wojcik Budbar | Pl-26-220 Staporkow | 2011 |
| Bartnes AS | Trondheim | 1987 |