| Arnfinn Johansen Wildlife Photography AS | Administrative & support | 2018 |
| Aron Gruppen AS | Hospitality | 2020 |
| Arsc AS | Information & communication | 2026 |
| Art Forum Ans | Information & communication | 1994 |
| Art of Audio Da | Wholesale & retail | 2014 |
| Arv Holding AS | Real estate | 2006 |
| AS Anders Sandvigsgate 52 | Households | 1956 |
| AS Byegården | Real estate | 1964 |
| AS Etterstadgaten 22 | Households | 1950 |
| AS Fosil | Financial services | 1985 |
| AS Kirkegaten 74 | Real estate | 1971 |
| AS Kirkegaten 70 | Real estate | 1957 |
| Asag Holding AS | | 2025 |
| Asbjørn Seielstad Holding AS | Financial services | 2005 |
| ASK25 AS | Hospitality | 2025 |
| Askeladden Barnehage SA | Education | 1982 |
| Askepott Interiør AS | Manufacturing | 1998 |
| Asle Kaulum AS | Wholesale & retail | 2000 |
| Asle Kaulum Holding AS | Real estate | 2018 |
| Aspesletten Eiendommer AS | Real estate | 1971 |
| Aspesletten Holding AS | Real estate | 2005 |
| Assist Innlandet AS | Information & communication | 2024 |
| Asto AS | Real estate | 2005 |
| At Kaulum Invest AS | Real estate | 2017 |
| Atlas Law AS | Education | 2024 |
| Atter Secondhand AS | Wholesale & retail | 2025 |
| Atw Storkjøkken Senter AS | Wholesale & retail | 1989 |
| Aubø Holding AS | Wholesale & retail | 2022 |
| Audiostyle Ans | Wholesale & retail | 2002 |
| Aungs AS | Hospitality | 2023 |
| Aurelium Holding AS | Professional & scientific | 2024 |
| Auto Shine AS | Other services | 2017 |
| Autocenteret AS | Wholesale & retail | 1995 |
| Ava Holding AS | Other services | 2006 |
| Avab Norge AS | Arts & recreation | 2001 |
| Avantura AS | Financial services | 2010 |
| Awa Sagbakken AS | Wholesale & retail | 2022 |
| Axes Invest AS | | 2023 |
| Axes-Helse AS | Health & social care | 2013 |
| Axis AS | Real estate | 1994 |
| Axrh Holding AS | | 2024 |
| B & T Restaurant AS | Hospitality | 2017 |
| B-Jonsson Consulting AS | Information & communication | 2024 |
| B.Hagen Holding AS | | 2026 |
| Ba Finans AS | Real estate | 2006 |
| Baade Og Rekruttering AS | Administrative & support | 2014 |
| Badstufergen AS | Administrative & support | 2021 |
| Bakkar & Berg AS | Administrative & support | 1980 |
| Bambus AS | Professional & scientific | 2015 |
| Bandit Holding AS | Real estate | 2011 |
| Bandmar Medical AS | Administrative & support | 2017 |
| Bangs Oppmåling AS | Professional & scientific | 1957 |
| Bankgata 21 AS | Real estate | 2020 |
| Bankgata Eiendom AS | Real estate | 2022 |
| Bare Menneske AS | Health & social care | 2024 |
| Bare Yoga Lillehammer AS | Education | 2022 |
| Barpro Da | Arts & recreation | 2026 |
| Barsten Barjo AS | | 2025 |
| Basarene Holding AS | Real estate | 2005 |
| Base Camp Lillehammer AS | Administrative & support | 2006 |
| Base Trading AS | Wholesale & retail | 2018 |
| Batu Norway AS | Wholesale & retail | 2024 |
| Bauder AS | Wholesale & retail | 2003 |
| Bauhin Holding AS | | 2025 |
| BB Lillehammer AS | Hospitality | 2019 |
| Bbkonsult AS | Professional & scientific | 2022 |
| Beauville AS | Professional & scientific | 2015 |
| Bedriftspartner M AS | Professional & scientific | 2021 |
| Begby Holding AS | | 2023 |
| Begravelsesbyrå Dufseth AS | Other services | 1992 |
| Bekk Holding AS | | 2021 |
| Belsvik AS | Wholesale & retail | 2021 |
| Belsvik Breidegården AS | Real estate | 2023 |
| Beme AS | Professional & scientific | 2016 |
| Benedicte Invest AS | Financial services | 2005 |
| Benedikte Holding AS | | 2025 |
| Berg Og Weihe Samdrift Da | Agriculture & fishing | 2003 |
| Bergamot AS | Wholesale & retail | 2020 |
| Bergersen Invest AS | | 2016 |
| Bergseng Drift AS | Wholesale & retail | 1998 |
| Bergseng Invest AS | Real estate | 1997 |
| Bergsjordet Kompetanse AS | Education | 2023 |
| Bergsvein AS | Health & social care | 2009 |
| Bernhardsen Fysioterapi AS | Health & social care | 2017 |
| Besserud Holding AS | Real estate | 2018 |
| Betek AS | Manufacturing | 1987 |
| Bhan AS | Information & communication | 2025 |
| Biathlonteam AS | Arts & recreation | 2017 |
| Biene AS | Agriculture & fishing | 2026 |
| Biltakst Innlandet AS | Professional & scientific | 2016 |
| Bintoss Transport AS | Transport & logistics | 2025 |
| Biondi AS | Wholesale & retail | 1996 |
| Biristrand Vedproduksjon AS | Manufacturing | 2024 |
| Birkebeiner Minikonditori AS | Manufacturing | 2025 |
| Birkebeineren Friluftsbarnehage SA | Education | 1998 |
| Birkebeineren Hotell AS | Hospitality | 1996 |
| Bjørn B. Hansen AS | Health & social care | 2020 |
| Bjøro Invest AS | | 2005 |
| Bjørstad Holding AS | Real estate | 2005 |
| Blanc AS | Wholesale & retail | 2019 |