| Alt Det Andre AS | Straumsjøen | 2024 |
| Alt I 1 Bergen AS | Hjellestad | 2014 |
| Alt I Hage AS | Kongsberg | 2023 |
| Alt I Høyde AS | Kristiansand S | 2023 |
| Alt I Renhold Trondheim AS | Tiller | 2012 |
| Alt I Vaktmestertjenester AS | Oslo | 1998 |
| Alt Mulig Gruppen AS | Husnes | 2026 |
| Alt Mulig Mann Nils Hvam AS | Otta | 2022 |
| Alt Og Mer AS | Horten | 2025 |
| Alt R Mulig Ltd Nuf | Hønefoss | 2006 |
| Alt Rent AS | Bærums Verk | 2016 |
| Alt Til Festen AS | Bodø | 2025 |
| Alt Ute Service AS | Espeland | 2024 |
| Alt-Management AS | Tau | 2022 |
| Alta Bilutleie Ans | Alta | 1991 |
| Alta Event Og Teltutleie Da | Alta | 2006 |
| Alta Guiding AS | Alta | 2023 |
| Alta Matteutleie AS | Alta | 2009 |
| Alta Rent&Pent AS | Talvik | 2015 |
| Altan AS | Sylling | 2012 |
| Altaturer AS | Alta | 2012 |
| Altavem AS | Kongsberg | 2013 |
| Altaï Norway AS | Oslo | 2025 |
| Alteidet Lodge AS | Burfjord | 2020 |
| Alter FM Partners Sp.Z.O.O | 02-133 Warszawa | 2009 |
| Alter Interim Sp.Z.O.O | 02-677 Warszawa | 2009 |
| Altera Do Brasil Servicos Maritimos Ltda | Br-Cep 20031-004 Rio De Janeiro/Rj | 2021 |
| Altera Infrastructure Group Ltd. Nuf | Stavanger | 2022 |
| Altera Infrastructure Production Crew AS | Trondheim | 2010 |
| Alterga S.A. | 11-041 Olsztyn | 2013 |
| Altfix Egersund AS | Egersund | 2023 |
| Alti Eiendomsservice AS | Frei | 2020 |
| Alti Skadedyr AS | Solbergelva | 2022 |
| Altifon AS | Oslo | 2025 |
| Altikran AS | Oslo | 2014 |
| Altileie Kongsberg Da | Skollenborg | 2007 |
| Altimed Ressurs AS | Hagan | 2016 |
| Altini Renhold AS | Oslo | 2023 |
| Altinor AS | Svolvær | 2017 |
| Altiservice AS | Bjørkelangen | 2024 |
| Altiso AS | Veavågen | 2019 |
| Altitude Management AS | Fornebu | 2012 |
| Altmann AS | Sofiemyr | 1989 |
| Alto Bil AS | Oslo | 2023 |
| Altor PC AB Nuf | Se-103 23 Stockholm | 2025 |
| Altrad Services A/S Nuf | Dk-5500 Middekfart | 2025 |
| Altrad Stellingbouw Balliauw NV | Oslo | 2009 |
| Altrad Utstyr AS | Porsgrunn | 2025 |
| Altrent AS | Drammen | 2020 |
| Altura Solutions AS | Eidsvoll Verk | 2026 |
| Alu International SP. Z O.O. | 80-643 Gdansk | 2014 |
| Aluhak People AS | Klepp Stasjon | 2021 |
| Aluhak Utleie AS | Klepp Stasjon | 1987 |
| Alumni AB | Se-111 22 Stockholm | 2020 |
| Alurental AS | Stavanger | 2023 |
| Alux AS | Dk-8600 Silkeborg | 2017 |
| Alvasar Oü Nuf | Ee-76102 Rummu | 2026 |
| Alvea Emilia Anusewicz | Pl-83331 Niestepowo | 2014 |
| Alvens AS | Drammen | 2013 |
| Alver Damp Og Dypp AS | Alversund | 2023 |
| Alværvik Containerservice AS | Dale I Sunnfjord | 2015 |
| Alvøen Båtutleie AS | Mathopen | 2016 |
| Alwart Trading AS | Askim | 2017 |
| Always Football Group AS | Sandefjord | 2022 |
| Always Tickets AS | Ulset | 2023 |
| Am Direct AS | Molde | 1989 |
| Am Domener 2 Da | Oslo | 2006 |
| Am Domener 3 Da | Oslo | 2006 |
| Am Executive AS | Fyllingsdalen | 2022 |
| Am Forvaltning AS | Molde | 2010 |
| Am Tjeneste AS | Førresfjorden | 2026 |
| Ama Konsulent AS | Oslo | 1973 |
| Amalie Renhold Og Vedlikehold Hanne C Nilsen Og Arne Dahlseng Da | Oslo | 2001 |
| Amanda Strand AS | Halden | 2024 |
| Amanor AS | Drammen | 2018 |
| Amaranza AS | Kolbotn | 2018 |
| Amarelli Nordic Aps | Dk-2400 København Nv | 2014 |
| Amarillo AS | Trondheim | 2005 |
| Amas Opplevelser AS | Kautokeino | 2018 |
| Amazing Aurora AS | Tromsø | 2018 |
| Amazing Fjords AS | Vangsnes | 2014 |
| Amazing Scandinavia AS | Jessheim | 2025 |
| Amazingnor AS | Brønnøysund | 2023 |
| Ambio People AS | Stavanger | 2002 |
| Ambitek Ltd | Manchester M30 0Df | 2020 |
| Ambizzion Aps | Dk-4400 Kalundborg | 2020 |
| Ambor AS | Avaldsnes | 2025 |
| Ambutrans Jorg Heinze GmbH | 19053 Schwerin | 2002 |
| Amc Support Consultants Limited | Kincardinshire Ab39 2Ee Scotland | 2018 |
| Amcar Event AS | Tiller | 2021 |
| Amcel AS | Træna | 2025 |
| Amcs LLC, Nuf | Wa 98109-5210 Seattle | 2021 |
| Amec Foster Wheeler International Limited | Cheshire Wa16 8Qz | 2026 |
| Amelia AS | Fagerstrand | 2022 |
| Amendo Bemanning & Rekrytering AB Nuf | Se-111 20 Stockholm | 2024 |
| Amentum Clean Energy Norway | Warrington Wa3 6Xg | 2024 |
| Amer Logistics Limited | London Nw10 0Tg England | 2020 |
| America Dom-Management (Norway) Limited | London Ec1V 2Nx England | 2024 |
| American Holidays AS | Oslo | 2009 |
| Amerigo Project Services Limited | Billingham Ts23 4Hs | 2015 |