| Fab AD Fastigheter Ab | Real estate | 2007 |
| Fastighets Ab Barösund Kiinteistö Oy | Real estate | 2009 |
| Fastighets Ab Bäljarspark - Kiinteistö Oy Bäljarsinpuisto | Real estate | 1980 |
| Fastighets Ab Dönsby | Real estate | 1985 |
| Fastighets Ab Karis Bankhus | Real estate | 1985 |
| Fastighets Ab Katarina Kiinteistö Oy | Real estate | 2006 |
| Fastighets Ab Sannäsvägen 10 | Real estate | 2013 |
| Fastighets Ab Villagatan 9 | Real estate | 1986 |
| Fastighetsaktiebolaget Karis elevbostäder | Real estate | 1978 |
| Fastighetsaktiebolaget Landsbrovägen 2 | Real estate | 1958 |
| Fastighetsbolag Tik Ab | Real estate | 1997 |
| Fennicadesign Oy | Wholesale & retail | 2021 |
| FiggeBO AB | Construction | 2020 |
| Finisko Oy | Real estate | 1989 |
| Finnquality Homes Oy | Wholesale & retail | 2007 |
| Fli-Invest Ab | Real estate | 2020 |
| Flywheel Forest Oy | Agriculture & fishing | 2019 |
| Fonttis Service Ab | Other services | 2019 |
| Fribbe Oy | Wholesale & retail | 2021 |
| Furubo Ab | Professional & scientific | 2017 |
| Fysio Leena Rossi Oy | Health & social care | 2017 |
| Fysioterapia Knaapinen Oy | Health & social care | 2002 |
| GAIA Global Artificial Intelligence Automation Oy | Information & communication | 2015 |
| GCC Invest Oy | Real estate | 1971 |
| Grab-Tec Kb | Construction | 2005 |
| Grabber Visions Oy Ab | Information & communication | 2003 |
| Granntalli Ky | Arts & recreation | 2010 |
| Greger Eriksson Ab | Agriculture & fishing | 1998 |
| Grev Oy | Wholesale & retail | 2020 |
| HALI - Harmony Living Oy | Hospitality | 2015 |
| Halimo Oy | Other services | 2020 |
| Happy Flower kommanditbolag | Wholesale & retail | 2016 |
| HarrMan OY | Construction | 2023 |
| Hartifix Oy | Construction | 2005 |
| Helecki Oy Ab | Construction | 2014 |
| Helsinki Sock Company Ab | Wholesale & retail | 2017 |
| Hemur Oy Ltd | Construction | 2020 |
| Henry Österman Kb | Transport & logistics | 1983 |
| Hidden Obvious Oy | Information & communication | 2026 |
| Hielkema Taimisto Oy | Agriculture & fishing | 2022 |
| Hius- ja leivontapalvelu Kirsi Ky | Other services | 2006 |
| Holmström Group Ab | Education | 2017 |
| Hot Spring Oy | Information & communication | 1997 |
| Hybrid Human Consulting Oy | Professional & scientific | 2001 |
| Hygitex Oy Ab | Manufacturing | 2006 |
| Hyvinvointi Paasi Oy | Other services | 2020 |
| Hyvän Elämän Ruokakauppa Oy | Wholesale & retail | 2007 |
| IHQ Päivää Oy | Professional & scientific | 2025 |
| ILP-tukku Oy | Wholesale & retail | 2024 |
| IS-Kiinteistövuokraus Oy | Real estate | 2017 |
| Ilmalämpöcenter Oy | Manufacturing | 2010 |
| Ingman Consulting Ab Oy | Information & communication | 2018 |
| Insinööritoimisto ThoPlan Oy | Professional & scientific | 2021 |
| J. Krappe ky | Manufacturing | 2008 |
| J.A. Kustservice Kb | Transport & logistics | 2002 |
| JAG Assistans Ab | Health & social care | 2009 |
| Jinert OY | Construction | 2025 |
| JM Raktek Oy | Professional & scientific | 2024 |
| JR Fastigheter Ab | Administrative & support | 2020 |
| JR Kodintavaratalo Oy | Wholesale & retail | 2003 |
| JSSK - Investment Oy Ab | Real estate | 1988 |
| JTK Law OY | Professional & scientific | 2008 |
| Jankas Pub & Fast Food Ab Oy | Hospitality | 2013 |
| Jaraktech Oy | Manufacturing | 2022 |
| Jemino Ab | Financial services | 2007 |
| Jerusalem Leipomo ja Makeiset Oy | Wholesale & retail | 2019 |
| Jesse Oliver's Holding Ab | Financial services | 2022 |
| Johan Consulting Oy | Professional & scientific | 2022 |
| Johan Grönqvist LKV Oy Ab | Real estate | 2024 |
| Johannesdal Capital Oy | Real estate | 2023 |
| Jolin Box Oy | Arts & recreation | 2022 |
| Juho Alfthan Oy | Information & communication | 2023 |
| Juridisk byrå Fredenberg Ab | Professional & scientific | 2017 |
| Jutiland Oy | Information & communication | 2020 |
| Jym Oy Ab | Arts & recreation | 2025 |
| Järnö-Laiturit Oy Ab | Transport & logistics | 1985 |
| K.A.M.A Service Oy | Other services | 2021 |
| K.S Kakling Kurt Sundäng K.S Laatoitus Kb Ky | Construction | 1991 |
| Kreativ Flora AB | Wholesale & retail | 2007 |
| Kaffe & Kakku Sunnuntaileipuri Oy | Hospitality | 2023 |
| Kalinisan Siivous Palvelut Oy | Administrative & support | 2025 |
| Kardemumma Bakes Ab | Hospitality | 2024 |
| Karhupuiston Mesikämmen Oy | Professional & scientific | 2005 |
| Karis Frakt Kb - Karjaan Rahti Ky | Transport & logistics | 1985 |
| Karis Fysioterapi Ab Karjaan Fysioterapia Oy | Health & social care | 2020 |
| Karis Järn Ab - Karjaan Rauta Oy | Wholesale & retail | 1999 |
| Karis Lås - Karjaan Lukko Oy Ab | Wholesale & retail | 1997 |
| Karis Teknofastigheter Ab | Real estate | 1999 |
| Karis Telefon Ab | Information & communication | 1922 |
| Karis Trähall Ab | Professional & scientific | 1993 |
| Karis VVS-Torg Ab - Karjaan LVI-Tori Oy | Construction | 2010 |
| Karjaan Hammasklinikka Oy | Health & social care | 2024 |
| Karjaan Offsetpaino Oy | Information & communication | 1990 |
| Karjaan Rengashuolto Ky | Real estate | 1989 |
| Karjaan Talopalvelu Oy | Administrative & support | 1980 |
| Karjaan Varastomyynti Oy | Wholesale & retail | 2007 |
| Karl Stolt ky | Construction | 1969 |
| Kaskimaan Hoivakoti Oy | Health & social care | 2004 |
| Kb Ahlroth's Bilreparation - Ahlrothin Autokorjaamo Ky | Other services | 1982 |
| Kb Anian Lindroos Ky | Transport & logistics | 1990 |