| Holmestrand Begravelsesbyrå AS | Other services | 1997 |
| Holmestrand Bilforretning AS | Wholesale & retail | 1994 |
| Holmestrand Bilpleie Senter AS | Wholesale & retail | 2018 |
| Holmestrand Dyreklinikk AS | Professional & scientific | 2012 |
| Holmestrand Eiendom AS | Real estate | 2013 |
| Holmestrand Fastfood AS | Hospitality | 2020 |
| Holmestrand Fjordhotell AS | Real estate | 2013 |
| Holmestrand Fjordhotell Drift AS | Health & social care | 2019 |
| Holmestrand Fotklinikk AS | Health & social care | 2022 |
| Holmestrand Glassmagasin Ans | Wholesale & retail | 1977 |
| Holmestrand Golfsimulator AS | Administrative & support | 2025 |
| Holmestrand Holding AS | Real estate | 2013 |
| Holmestrand Internasjonale Montessoribarnehage SA | Education | 2003 |
| Holmestrand Lakkering AS | Other services | 2017 |
| Holmestrand Legesenter AS | Health & social care | 2018 |
| Holmestrand Medisinske Senter AS | Health & social care | 2012 |
| Holmestrand Optikk AS | Wholesale & retail | 2007 |
| Holmestrand Pizza AS | Hospitality | 2022 |
| Holmestrand Plateselskap Da | Information & communication | 2005 |
| Holmestrand Prosjekt AS | Real estate | 2025 |
| Holmestrand Regnskapssentral AS | Professional & scientific | 1992 |
| Holmestrand Rørleggerbedrift AS | Construction | 1971 |
| Holmestrand Sardine Co AS | Real estate | 1933 |
| Holmestrand Servicesenter AS | Other services | 2001 |
| Holmestrand Skitunnel AS | Real estate | 2014 |
| Holmestrand Småbåthavn AS | Transport & logistics | 2025 |
| Holmestrand Småbåthavn Da | Transport & logistics | 2003 |
| Holmestrand Trykk & Kopi AS | Wholesale & retail | 1990 |
| Holmestrand Uteliv AS | Hospitality | 2015 |
| Holmestrand Utvikling AS | Real estate | 2006 |
| Holmestrand Vaktmesterservice AS | Administrative & support | 2024 |
| Holmestrandgaten 21 AS | Real estate | 2011 |
| Holmestrandgaten 23 AS | Real estate | 2011 |
| Hoome AS | Wholesale & retail | 2022 |
| Horisontal Boring AS | Construction | 2011 |
| Horse Equipment Da | Manufacturing | 1992 |
| Hos Flyvern Pub AS | Hospitality | 2018 |
| House of Textiles & Wallcovering Ans | Professional & scientific | 2005 |
| HQ Equipment AS | Wholesale & retail | 2020 |
| HS Growth AS | Education | 2025 |
| HS Tømrer Service AS | Construction | 2018 |
| Hse Onshore AS | Administrative & support | 2019 |
| HSH Bygg Og Rådgivning AS | Construction | 2024 |
| HT Selskapsmat Da | Hospitality | 2024 |
| Ht-Club AS | Arts & recreation | 2009 |
| Hus Og Rom AS | Professional & scientific | 2020 |
| Huse Capital AS | | 2026 |
| Husfliden Holmestrand SA | Wholesale & retail | 1983 |
| Hvittingfossveien 117 AS | Real estate | 2022 |
| Hvittingfossveien 121 AS | | 2015 |
| Hvittingfossveien 123B AS | | 2015 |
| Hvittingfossveien 25 Ans | Real estate | 2005 |
| Hvittingfossveien 92 AS | Wholesale & retail | 2018 |
| Hymer Holding AS | Construction | 2024 |
| Håndtverkern AS | Real estate | 2010 |
| Høgefjell Holding AS | | 2026 |
| Høyangveien Holding AS | | 2026 |
| I18 Hof AS | Real estate | 2023 |
| Id Eiendom AS | Administrative & support | 2014 |
| Id Holding AS | Administrative & support | 2011 |
| Ieh Holding AS | | 2025 |
| Iglootech AS | Wholesale & retail | 2012 |
| Igm Shop Norge AS | Wholesale & retail | 2024 |
| Illuminated AS | Professional & scientific | 2025 |
| Ilma Lager AS | Real estate | 2022 |
| Impatiens AS | Financial services | 1994 |
| Incotech AS | Information & communication | 2016 |
| Indre's Renhold AS | Administrative & support | 2016 |
| Industriveien 2 Holmestrand AS | Construction | 2015 |
| Infomap Norge AS | Information & communication | 1996 |
| Innoxema AS | Professional & scientific | 2024 |
| Inspira Holmestrand AS | Wholesale & retail | 2016 |
| Interart Design AS | Wholesale & retail | 2005 |
| Intersport Holmestrand AS | Wholesale & retail | 2004 |
| Intuitive Impacts AS | Education | 2025 |
| Investeringsselskapet Trifolium AS | | 2007 |
| Irmet AS | Manufacturing | 2020 |
| J B Lie Eiendom AS | Professional & scientific | 2005 |
| Jah Elektro AS | Construction | 2008 |
| Jar Anlegg AS | Construction | 2008 |
| Jarlsberg Avis AS | Information & communication | 1995 |
| Jarlsberg Eiendomselskab Holding AS | Real estate | 2011 |
| Jarlsberg Varmeteknikk AS | Construction | 2002 |
| Jazzberry Holding AS | Professional & scientific | 2021 |
| JBG Holding AS | Real estate | 2005 |
| Jbhansen Invest AS | | 2021 |
| Jbø Eiendom AS | Financial services | 2022 |
| Jear AS | Real estate | 2013 |
| Jensen Drift Og Vedlikehold AS | Administrative & support | 2020 |
| JG Plastsveis AS | Construction | 2024 |
| JM Aven Holding AS | Financial services | 2005 |
| Jolly Bob AS | Construction | 2022 |
| Jon Wulff Transport AS | Transport & logistics | 1997 |
| K.E.J. AS | Administrative & support | 2023 |
| Kaga Invest AS | | 2022 |
| Kaiteki Consulting AS | Information & communication | 2013 |
| Kaixo AS | | 2024 |
| Kalager Gård AS | Construction | 2016 |
| Kaleb AS | Administrative & support | 2024 |
| Kallos AS | Health & social care | 2021 |