| Volt Holding Harstad AS | Construction | 2021 |
| Volt Rør AS | Construction | 2022 |
| Volt Utbygging AS | Real estate | 2020 |
| Volum by Lisa AS | Other services | 2009 |
| VS Eiendom AS | Real estate | 2014 |
| Vågen Og Kilhus Grunneierlag SA | Real estate | 1996 |
| Vågsfjord AS | | 2024 |
| Vågsfjord Eiendom Ans | Real estate | 2014 |
| Vågstranda 2A AS | Real estate | 2019 |
| Wall Street AS | Professional & scientific | 2021 |
| Walsen AS | Wholesale & retail | 2020 |
| Wasteless Wares AS | Wholesale & retail | 2025 |
| We Build Parks Norway AS | Construction | 2023 |
| Webware AS | Information & communication | 2013 |
| Weezee AS | Information & communication | 2018 |
| Wekst Invest AS | Real estate | 2020 |
| Welding and Inspection Technology AS | Professional & scientific | 2020 |
| Wenaas Eiendom AS | Real estate | 1997 |
| Westnes AS | | 2012 |
| Willy Stabell Holding AS | | 2008 |
| WK Regnskap AS | Professional & scientific | 2017 |
| Worktek AS | Administrative & support | 2018 |
| WPT AS | Wholesale & retail | 2005 |
| Wus Holding AS | Hospitality | 2023 |
| Xl-Bygg Harstad AS | Wholesale & retail | 1996 |
| Y. Eide AS | Administrative & support | 2006 |
| Yes Vi Leker Harstad AS | Wholesale & retail | 2012 |
| Yogaro AS | Education | 2017 |
| Yoginis Yogastudio AS | Education | 2016 |
| Yuuka Yuuka Harstad AS | Hospitality | 2023 |
| Yuuka Yuuka Sushi AS | Hospitality | 2015 |
| Yuuka Yuuka Sushi Tromsø AS | Hospitality | 2019 |
| Yvia AS | Administrative & support | 2023 |
| Zeb Harstad AS | Other services | 2025 |
| Zelig Consulting AS | Professional & scientific | 2019 |
| Zero Invest AS | Financial services | 2014 |
| Zico Harstad AS | Financial services | 2013 |
| Zigo Holding AS | Wholesale & retail | 2021 |
| Zigo MC AS | Wholesale & retail | 1986 |
| ZU4R Sportswear AS | Wholesale & retail | 2016 |
| ÁB Holding AS | Professional & scientific | 2022 |
| ÁB Utvikling AS | | 2025 |
| Åk Eiendom Ans | Real estate | 2006 |
| Åsegarden AS | Professional & scientific | 2014 |
| Ærekraft AS | Professional & scientific | 2023 |
| Økonomiconsult AS | Professional & scientific | 1996 |
| Økonomiservice Harstad AS | Professional & scientific | 1993 |
| Østenbekkveien 33 AS | Real estate | 2025 |
| Østerås-Henriksen Holding AS | | 2022 |
| Øverland Vekst AS | | 1998 |
| Øvre Ruggevik AS | Real estate | 2005 |