| Jk-Bygg AS | Construction | 2006 |
| Jk-F Invest AS | | 2025 |
| Jkav AS | | 2022 |
| Jkbr Invest AS | | 2023 |
| Jkdale AS | Professional & scientific | 2012 |
| Jke Byggconsult AS | Professional & scientific | 2008 |
| Jke Eiendom AS | Real estate | 2012 |
| Jkef Eiendom AS | Real estate | 2017 |
| JKGT2 AS | Real estate | 2011 |
| JKJ Invest AS | Professional & scientific | 2005 |
| JKJ Investments AS | | 2019 |
| JKL Intressenter AB Norsk Avdeling Av Utenlandsk Enhet | Professional & scientific | 2000 |
| Jkl-Holding AS | Real estate | 1981 |
| Jknk Holding AS | | 2025 |
| Jkpp Holding AS | | 2026 |
| JKR Consulting AS | Information & communication | 2007 |
| JKR Jan Kihm Rørmontasje AS | Construction | 1987 |
| JKS AS | Health & social care | 2021 |
| JKS Norge AS | Administrative & support | 2007 |
| JKT Aesthetics AS | Health & social care | 2017 |
| JKT Investment AS | Health & social care | 2017 |
| Jktn Holding AS | | 2024 |
| JL Foss Holding AS | Real estate | 1971 |
| JL Investment AS | | 2022 |
| Jlac Holding AS | | 2025 |
| JLF Invest AS | Professional & scientific | 2016 |
| JLH AS | Arts & recreation | 2021 |
| JLH Eiendom AS | Real estate | 2021 |
| JLJ AS | | 2026 |
| Jlmb AS | Wholesale & retail | 2023 |
| JM Bolig AS | Real estate | 2024 |
| JM Entreprenør AS | Construction | 2018 |
| JM Fjeldstad Holding AS | | 2023 |
| JM Jessheim B6.3 BT2 AS | Real estate | 2024 |
| JM Jessheim B6.3 BT3 AS | Real estate | 2024 |
| JM Jessheim B6.3 BT4 AS | Real estate | 2024 |
| JM Legetjenester AS | Health & social care | 2025 |
| JM Norge AS | Construction | 1964 |
| JM Regnskap AS | Professional & scientific | 2020 |
| JM Solid Bygg AS | Construction | 2025 |
| JM Ventures AS | Professional & scientific | 2019 |
| Jm@Home AS | Professional & scientific | 2018 |
| JMB NXT AS | Information & communication | 2024 |
| JMD AS | Financial services | 2017 |
| Jmi AS | Real estate | 2020 |
| JMK Capital AS | Professional & scientific | 2018 |
| JMK Consulting AS | Professional & scientific | 2020 |
| JMK Eiendom AS | Real estate | 2022 |
| JML Bygg AS | Construction | 2023 |
| JMN Holding AS | Professional & scientific | 2023 |
| Jmot Holding AS | | 2018 |
| JMP Eiendom AS | Real estate | 2021 |
| JMP Oslo Asfalt Da | Construction | 2005 |
| JMR Support AS | Hospitality | 2025 |
| JMR Transport AS | Wholesale & retail | 2018 |
| JMS Helping Hand Limited Nuf | Professional & scientific | 2025 |
| JMT Holdco AS | Professional & scientific | 2019 |
| JMT Holding Company AS | Administrative & support | 2013 |
| JN Eiendom AS | Real estate | 2005 |
| Jnck Holding AS | Real estate | 2020 |
| Jnhs 259 AS | Real estate | 2025 |
| Jnhs 27 AS | Hospitality | 2025 |
| Jnhs 367 AS | | 2026 |
| Jnhs 401 AS | Professional & scientific | 2026 |
| Jnhs 413 AS | | 2026 |
| Jnhs 426 AS | | 2026 |
| Jnhs 431 AS | | 2026 |
| Jnhs 432 AS | | 2026 |
| Jnhs 433 AS | | 2026 |
| Jnhs 434 AS | | 2026 |
| Jnhs 435 AS | | 2026 |
| Jnhs 436 AS | | 2026 |
| Jnhs 437 AS | | 2026 |
| Jnhs 438 AS | | 2026 |
| Jnhs 439 AS | | 2026 |
| Jnhs 440 AS | | 2026 |
| Jnhs 441 AS | | 2026 |
| Jnhs 442 AS | | 2026 |
| Jnhs 443 AS | | 2026 |
| Jnhs 444 AS | | 2026 |
| Jnhs 445 AS | | 2026 |
| Jnhs 446 AS | | 2026 |
| Jnhs 447 AS | | 2026 |
| Jnhs 448 AS | | 2026 |
| Jnhs 449 AS | | 2026 |
| Jnhs 450 AS | | 2026 |
| Jnhs 451 AS | | 2026 |
| Jnhs 452 AS | | 2026 |
| Jnhs 453 AS | | 2026 |
| Jnhs 454 AS | | 2026 |
| Jnhs 455 AS | | 2026 |
| Jnhs 456 AS | | 2026 |
| Jnhs 457 AS | | 2026 |
| Jnhs 458 AS | | 2026 |
| Jnhs 459 AS | | 2026 |
| Jnhs 460 AS | | 2026 |
| Jnhs 461 AS | | 2026 |
| Jnhs 462 AS | | 2026 |
| Jnhs 463 AS | | 2026 |
| Jnhs 464 AS | | 2026 |