| Lapin Pihakivimyynti Oy | Wholesale & retail | 2021 |
| Lapinexpres Oy | Hospitality | 2020 |
| Lapland Reindeer Experience Oy | Arts & recreation | 2015 |
| Lappajärven Kauppapaikka Oy | Real estate | 2022 |
| Larango Invest Oy | Financial services | 2016 |
| Lasimatic Oy | Other services | 2019 |
| Lasse Vaajanen Oy | Transport & logistics | 2000 |
| Last chance Oy | Wholesale & retail | 2022 |
| Laulainen Ky | Wholesale & retail | 1983 |
| Laulujoutsenet Oy | Health & social care | 2003 |
| Laundryman Oy | Other services | 2019 |
| Laurinlahden Pysäköinti Oy | Real estate | 2024 |
| Lauttasaari SPV Oy | Real estate | 2016 |
| Lavakeskus OY | Manufacturing | 2021 |
| Lavonen Engineering Oy | Professional & scientific | 1995 |
| Lavrona Oy | Professional & scientific | 2018 |
| Law Wu Oy | Hospitality | 2014 |
| Lazy Car Wash Oy | Other services | 2019 |
| Lazza Oy | Hospitality | 2019 |
| LeKurb Oy | Arts & recreation | 2021 |
| Leancom Oy | Professional & scientific | 2004 |
| Lease-e Ab | Administrative & support | 2021 |
| Ledfender.com Oy | Manufacturing | 2023 |
| Leenharjun vesiosuuskunta | Construction | 1999 |
| Lehtimäki & Työläjärvi Oy | Arts & recreation | 2021 |
| Leijona Security Oy | Information & communication | 2019 |
| Leikumat Oy | Professional & scientific | 2017 |
| Lekoja Consulting Oy | Professional & scientific | 2021 |
| Lembitu Solutions Oy | Professional & scientific | 2020 |
| Lemilius Investments Oy | Real estate | 2015 |
| Lempipaino Oy | Manufacturing | 2023 |
| Lempiäinen Capital Oy | Financial services | 2021 |
| Lempäälän Rakennus & Huoneistoremontit Oy | Construction | 2014 |
| Lensvet Ltd Oy | Construction | 2022 |
| Leon Investment Oy | Wholesale & retail | 1993 |
| Leorap Oy | Construction | 2009 |
| Lepus Ruminat Oy | Hospitality | 2002 |
| Letkun Kyläkauppa Oy | Wholesale & retail | 2017 |
| Levante Oy | Information & communication | 2017 |
| Levin Nyman & Partners OY | Professional & scientific | 2019 |
| Lexxa Oy | Wholesale & retail | 2014 |
| Liber Finance Oy | Financial services | 2016 |
| Lida Hashemi Oy | Wholesale & retail | 2018 |
| Lieksan KTK-osuuskunta | Transport & logistics | 1975 |
| Lietso Oy | Professional & scientific | 2008 |
| Lifter Oy | Construction | 2023 |
| Liikuntapalvelut TH Oy | Education | 2023 |
| Liikuntasali Oy 35 Plus | Health & social care | 2004 |
| Like Suoranta Oy | Hospitality | 2016 |
| Lilla Bergskär Invest Ab | Professional & scientific | 2024 |
| Limei (Finland) Technology Oy | Professional & scientific | 2024 |
| Limited Editions Finland Oy | Information & communication | 2022 |
| Linchpin Finland Oy | Wholesale & retail | 2018 |
| Lindqvist Invest Ltd Oy | Financial services | 2020 |
| Linja-autoliikenne R & F RINDELL, avoin yhtiö | Transport & logistics | 2004 |
| Link-local Oy | Professional & scientific | 2024 |
| Linnavuoren Rakentamispalvelut Oy | Construction | 2019 |
| Linwell Deli Oy | Wholesale & retail | 2019 |
| Liquimi Craft Oy | Hospitality | 2020 |
| Lit-teä Ab Oy | Wholesale & retail | 2021 |
| Littoisten Taverna Oy | Hospitality | 2023 |
| Live Kiinteistönvälitys Oy | Real estate | 2015 |
| Live Realtors Oy | Real estate | 2019 |
| Livemusicfinland oy | Arts & recreation | 2023 |
| Livesome Oy | Arts & recreation | 2020 |
| Local Solutions Oy | Construction | 2020 |
| Locking Systems Ltd Oy | Professional & scientific | 2017 |
| Lockser Ltd (Oy) | Manufacturing | 2014 |
| LogLove Rakentajat Oy | Construction | 2019 |
| Logatex Oy | Wholesale & retail | 2003 |
| Logistics HR Oy | Administrative & support | 2018 |
| Logitall AB, filial i Finland | Information & communication | 2000 |
| Logrus Oy | Manufacturing | 2020 |
| Logstar Finland oy | Information & communication | 2020 |
| Loha Service Oy | Administrative & support | 2020 |
| Loimukitka Oy | Real estate | 1995 |
| LokLok Oy | Information & communication | 2023 |
| Lokakylän vesiosuuskunta | Water & waste | 1997 |
| Lomira oy | Hospitality | 2001 |
| Loop LKV Oy | Real estate | 2019 |
| Lopen Talotekniikka Oy | Construction | 2020 |
| Loppi Oy | Manufacturing | 1946 |
| Lorsu Oy | Education | 2022 |
| Louder LKV Oy | Real estate | 2016 |
| Louhintaliike Kauppinen Oy | Mining & quarrying | 2020 |
| Lounais-Suomen Perheasunnot Oy | Construction | 2020 |
| Lounais-Suomen Rakennus Oy | Construction | 2006 |
| Lounas- ja Pitopalvelukeskus Ky Pekka Naumanen | Hospitality | 1988 |
| Lounasravintola Phetkano Oy | Hospitality | 2023 |
| LoveComms Oy | Arts & recreation | 2016 |
| Loyalty for maintenance & cleaning company Oy | Administrative & support | 2020 |
| LubTech Oy | Manufacturing | 2022 |
| Lucky Scandia Oy | Hospitality | 2018 |
| Luftair Oy | Administrative & support | 2020 |
| Lukas Automaalaamo Oy | Other services | 2021 |
| Lumi Interactive Oy | Information & communication | 2002 |
| Lumidi Oy | Information & communication | 2021 |
| Lumimark Oy | Professional & scientific | 2011 |
| Lumio Oy | Other services | 1989 |
| Lumokissan putiikki Oy | Wholesale & retail | 2019 |