| JuiX Oy | Hospitality | 2019 |
| Juice & Veggies Hakaniemi Oy | Hospitality | 2024 |
| Juice & Veggies Oy | Hospitality | 2022 |
| Juice & Veggies Turku Oy | Hospitality | 2023 |
| Juicers Media Oy | Information & communication | 2019 |
| Juicy Labs Oy | Professional & scientific | 2019 |
| Juicy Rebound Oy | Information & communication | 2022 |
| Juji Group Oy | Financial services | 2018 |
| Jujopi Oy | Professional & scientific | 2019 |
| Juju 23 Oy | Wholesale & retail | 2009 |
| Jujukas Oy | Wholesale & retail | 2012 |
| JukNic Media Oy | Information & communication | 2016 |
| Jukan Pizza Ky | Hospitality | 1991 |
| Jukan Productions Oy | Information & communication | 1989 |
| Jukarainen Oy Insinööritoimisto | Professional & scientific | 2005 |
| Juke Box Enterprise JBE Oy | Administrative & support | 1993 |
| Juke-Invest Oy | Financial services | 1986 |
| Juken Oy | Wholesale & retail | 2016 |
| Jukio Kallio Oy | Arts & recreation | 2016 |
| Jukitrans ky | Transport & logistics | 2003 |
| Jukka Aho & Co Project Law Consultants Oy | Professional & scientific | 1987 |
| Jukka Aho Holding Oy | Professional & scientific | 2008 |
| Jukka Espo Oy | Financial services | 1997 |
| Jukka Jauho Oy | Construction | 2019 |
| Jukka Lamminmäki Investing Oy | Financial services | 1983 |
| Jukka Leino Project Law Oy | Professional & scientific | 1994 |
| Jukka Luostarinen Holding Oy | Financial services | 1999 |
| Jukka Male Oy | Professional & scientific | 1986 |
| Jukka Rintala Oy | Professional & scientific | 1986 |
| Jukka Westerback Oy | Transport & logistics | 1995 |
| Jukkis Loponen Oy | Other services | 2019 |
| Juksari Oy | Financial services | 2023 |
| Juksor Oy | Wholesale & retail | 1994 |
| JulVerInvest Oy | Financial services | 2020 |
| Juleslife Oy | Arts & recreation | 2018 |
| Juli Alppiharjun Kalliolanrinne Oy | Financial services | 2022 |
| Juli Arabianrannan Illuusio Oy | Real estate | 2023 |
| Juli Bertelinkulman Kajaste Oy | Real estate | 2019 |
| Juli Friisilän Heinätähti Oy | Real estate | 2020 |
| Juli Haukiluoman Kivikerkkä Oy | Financial services | 2022 |
| Juli Herttoniemen Kukkaniitty Oy | Financial services | 2025 |
| Juli Herttoniemen Paratiisilintu Oy | Real estate | 2020 |
| Juli Jätkäsaaren Kommodori Oy | Real estate | 2018 |
| Juli Kalasataman Edison Oy | Real estate | 2019 |
| Juli Kirstinpuiston Christine Oy | Real estate | 2019 |
| Juli Kultahippu Oy | Real estate | 2022 |
| Juli Kuunsilta Oy | Real estate | 2022 |
| Juli Leppävaaran Atleetti Oy | Financial services | 2022 |
| Juli Lielahden Tuuli Oy | Real estate | 2022 |
| Juli Living Finland Oy | Real estate | 2021 |
| Juli Malmin Floristi Oy | Real estate | 2020 |
| Juli Martinlaakson Mestari Oy | Real estate | 2022 |
| Juli Martinlaakson Voitto Oy | Real estate | 2022 |
| Juli Niittykummun Helmi Oy | Real estate | 2019 |
| Juli Niittykummun Kultakoivu Oy | Real estate | 2019 |
| Juli Niittykummun Pihlaja Oy | Real estate | 2019 |
| Juli Niittykummun Vaahtera Oy | Real estate | 2019 |
| Juli Nöykkiön Metsänhaltija Oy | Real estate | 2020 |
| Juli Nöykkiön Tuulenhaltija Oy | Real estate | 2020 |
| Juli Pukkilan Elegance Oy | Real estate | 2020 |
| Juli Pukkilan Harmony Oy | Real estate | 2021 |
| Juli Pukkilan Kaarna Oy | Real estate | 2020 |
| Juli Pukkilan Natura Oy | Real estate | 2021 |
| Juli Pukkilan Railo Oy | Real estate | 2021 |
| Juli Saunalahden Navigaattori Oy | Real estate | 2020 |
| Juli Tampereen Lamminpään Runoilija Oy | Real estate | 2020 |
| Juli Tampereen Lamminpään Taiteilija Oy | Real estate | 2020 |
| Juli Tesoman Vuokko Oy | Real estate | 2020 |
| Juli Tikkurilan Onnekas Oy | Real estate | 2021 |
| Juli Tikkurilan Verraton Oy | Real estate | 2018 |
| Julia Domna Oy | Hospitality | 2021 |
| Julia Gottberg Oy Ab | Professional & scientific | 2026 |
| Julia Matilainen Oy | Professional & scientific | 2026 |
| Julia Valkamo Interiors Oy | Professional & scientific | 2026 |
| Julia Venture Oy | Financial services | 2010 |
| Julia Works Oy | Financial services | 2009 |
| Juliaihminen Oy | Arts & recreation | 2018 |
| Julienna ky | Hospitality | 2025 |
| Julima Oy | Financial services | 2009 |
| Julinda Oy | Financial services | 2013 |
| Julix Ky | Professional & scientific | 2013 |
| Julkaisumaailma Oy | Professional & scientific | 1998 |
| Julkaisumonistamo Eteläranta Oy | Administrative & support | 1994 |
| Julkaisuosakeyhtiö Elias | Information & communication | 2007 |
| Julkee Oy | Professional & scientific | 2009 |
| Julkee x Lempee Oy | Professional & scientific | 2020 |
| Jullepupu Holding Oy | Financial services | 2018 |
| Jullikat Oy | Wholesale & retail | 1995 |
| Jullitar Oy | Wholesale & retail | 2016 |
| JulmeCo Oy | Professional & scientific | 2026 |
| Julmuus Oy | Administrative & support | 2021 |
| Julpermi Oy | Professional & scientific | 2008 |
| Julu oy | Professional & scientific | 2026 |
| Julvis Oy | Construction | 2025 |
| Jumbo Bus Oy | Transport & logistics | 2020 |
| Jumed Oy | Health & social care | 2013 |
| Jumipe Oy | Financial services | 2025 |
| Jump Off Kb | Financial services | 2017 |
| Jump Smart Oy | Other services | 2013 |
| Jumpion Health Oy | Health & social care | 2001 |