| Yippi Flatåsen B3 AS | Real estate | 2022 |
| Yippi Flatåsen B4 AS | Real estate | 2022 |
| Yippi Flatåsen B5 AS | Real estate | 2023 |
| Yippi Invest AS | Real estate | 2023 |
| Ykv Holding AS | | 2022 |
| Ylba AS | Administrative & support | 2016 |
| Ylvind Holding AS | Health & social care | 2014 |
| Yme Arkitekter AS | Professional & scientific | 2021 |
| Yngis AS | Real estate | 2007 |
| Ynwa Holding AS | Professional & scientific | 2011 |
| Yob AS | Information & communication | 2024 |
| Yolodyne Techsystems AS | | 2025 |
| Yolot AS | Real estate | 2020 |
| York Hundesalong AS | Agriculture & fishing | 2024 |
| Youplus Insurtech AS | Information & communication | 2019 |
| Youplus Livsforsikring Nuf | Financial services | 2021 |
| Yourvoice AS | Professional & scientific | 2025 |
| Youtello Solutions AS | Information & communication | 2025 |
| Yrjar Panorama AS | Real estate | 2014 |
| Yrkeshygiene AS | Professional & scientific | 2019 |
| Yrr Holding AS | | 2022 |
| Yt Holding AS | Financial services | 2015 |
| Ytconsult AS | Administrative & support | 2022 |
| Ytfor AS | Information & communication | 2023 |
| Ytre Vikna 1 AS | Energy | 2018 |
| Ytterkammen Holding AS | | 2025 |
| Yttersian Invest AS | | 2021 |
| Yu Invest AS | | 2026 |
| Yx Eiendom Leangen AS | Real estate | 2009 |
| Yx Eiendom Norge AS | Real estate | 2006 |
| Yx Kroodden Eiendom AS | Real estate | 2008 |
| Z-Consult AS | Professional & scientific | 2021 |
| Zabitaxi AS | Transport & logistics | 2024 |
| Zalabim Da | Information & communication | 2025 |
| Zanja AS | Financial services | 2018 |
| Zannobia AS | Hospitality | 2021 |
| Zanti AS | | 2025 |
| Zeabuz AS | Transport & logistics | 2019 |
| Zedge Europe AS | Information & communication | 2009 |
| Zeito Holding AS | Professional & scientific | 2020 |
| Zenit Science AS | Professional & scientific | 2023 |
| Zenit Yoga AS | Education | 2005 |
| Zenlink AS | Information & communication | 2026 |
| Zentus AS | Professional & scientific | 2005 |
| Zep AS | Wholesale & retail | 2026 |
| Zephyrsoft AS | Information & communication | 2023 |
| Zeruzzi AS | Wholesale & retail | 2023 |
| Zhanna D'Art AS | Other services | 2013 |
| Zhanpeng AS | Real estate | 2017 |
| Zibbi AS | Information & communication | 2025 |
| Zico Holding AS | Wholesale & retail | 2006 |
| Zion Utleieboliger AS | Real estate | 1981 |
| Zisyphus AS | Information & communication | 2025 |
| Zizr AS | Professional & scientific | 2019 |
| Zolen & Månen AS | Real estate | 2012 |
| Zolve AS | Professional & scientific | 2017 |
| Ztech Invest AS | | 2024 |
| Zukunft AS | | 2019 |
| Zxy Sport Tracking AS | Information & communication | 2002 |
| ZXZ Travel AS | Transport & logistics | 2018 |
| ZZ Auto AS | Other services | 2020 |
| Ådne AS | Manufacturing | 2019 |
| Åkvik Invest AS | | 2025 |
| Ålesund Bil Invest AS | Other services | 2011 |
| Ålesund Panorama AS | | 2007 |
| Ålesund Tomteselskap AS | Real estate | 2012 |
| Åre Group AS | Professional & scientific | 2015 |
| Århi Eiendom AS | Real estate | 2016 |
| Årl Holding AS | | 2025 |
| Åsfjellet Eiendom AS | Real estate | 2022 |
| Åsland Næringspark AS | Real estate | 2005 |
| Åsland Næringspark Eiendom AS | Real estate | 2005 |
| Åsmul Holding AS | | 2023 |
| Åsvang Consulting AS | Professional & scientific | 2016 |
| Åsvang Invest AS | Financial services | 2005 |
| Åsøya Eiendom AS | Administrative & support | 2015 |
| Ægga AS | Professional & scientific | 2007 |
| Ægir Harvest AS | Professional & scientific | 2018 |
| Æta AS | Agriculture & fishing | 2024 |
| Övobu Invest AS | | 2025 |
| Ø. Magnussen Invest AS | | 2021 |
| Ø. Nylander AS | | 2005 |
| ØB52 Eiendom AS | Real estate | 2026 |
| Ødegården Næringspark AS | Real estate | 2021 |
| Øivind Johnsen AS | | 2024 |
| Økoråd Trondheim AS | Professional & scientific | 2006 |
| Økovent AS | Construction | 2013 |
| Økovent Holding AS | | 2025 |
| Øksa AS | | 2026 |
| Øksendal Holding AS | Financial services | 2005 |
| Ølevent Trøndelag AS | Wholesale & retail | 2019 |
| Ølstad AS | | 2025 |
| Ømv Eiendom AS | Real estate | 2017 |
| Øp Holding AS | | 2012 |
| Øra Artist AS | Professional & scientific | 2023 |
| Øra Musikk AS | Arts & recreation | 2007 |
| Øra Studio AS | Information & communication | 2024 |
| Ørebekk Senter AS | Real estate | 2007 |
| Øren Kro AS | Hospitality | 2001 |
| Ørjansen Invest AS | | 2022 |