| Oy HWF Finland Ab | Transport & logistics | 2013 |
| Oy Hakkilankulma Ab | Real estate | 1990 |
| Oy Halva Ab | Manufacturing | 1942 |
| Oy Halva-Trading Ab | Wholesale & retail | 1987 |
| Oy Har-Jus Ab | Real estate | 1974 |
| Oy Helsinki A & C Ltd | Professional & scientific | 1984 |
| Oy Helsinki Advisers Ab | Professional & scientific | 2020 |
| Oy Humbug Ltd | Professional & scientific | 2000 |
| Oy Husqvarna Ab | Wholesale & retail | 2005 |
| Oy Husqvarna Commercial Solutions Finland Ab | Administrative & support | 2020 |
| Oy Hygienelab Finland Ltd | Information & communication | 2006 |
| Oy IP Maalaamo & Måleri Ab | Construction | 1994 |
| Oy Infraconsulting Ab Ltd | Professional & scientific | 2007 |
| Oy Insinööritoimisto International Ink Ab | Professional & scientific | 1989 |
| Oy Insinööritoimisto Steinwand Ab | Construction | 1989 |
| Oy Interior Invest Ab | Real estate | 2025 |
| Oy International Paint (Finland) Ab | Wholesale & retail | 1994 |
| Oy J-Trading Ab | Wholesale & retail | 1982 |
| Oy J-Trading Koneet Ab | Wholesale & retail | 2007 |
| Oy Jens S. Ab | Wholesale & retail | 1997 |
| Oy Jert-Sähköasennus Ab | Construction | 1993 |
| Oy John Scott's Finland Ab | Hospitality | 2022 |
| Oy Jätten Finland Ab | Real estate | 2012 |
| Oy K. Juslin Ab | Construction | 1951 |
| Oy KAFA Ab | Wholesale & retail | 2024 |
| Oy KWH Freeze Ab | Transport & logistics | 1965 |
| Oy Kaha Ab | Wholesale & retail | 1991 |
| Oy Kama Fritid Ab | Wholesale & retail | 1991 |
| Oy Karl Fazer Ab | Professional & scientific | 1919 |
| Oy Kavaleff Consulting Ab | Professional & scientific | 2000 |
| Oy Keystone Capital Ltd. | Financial services | 1986 |
| Oy Kiinteistö Vantaan Siikatie 24b | Real estate | 1976 |
| Oy Kirjaparoni | Wholesale & retail | 2007 |
| Oy Kisalämpö Ab | Administrative & support | 1951 |
| Oy Klippan Ab | Manufacturing | 1959 |
| Oy Kompagniet Ab | Wholesale & retail | 1992 |
| Oy Konsultointi Siniketo Ab | Professional & scientific | 2001 |
| Oy Kopparberg Finland Ab | Wholesale & retail | 1999 |
| Oy Korate Ab | Wholesale & retail | 1994 |
| Oy Kuehne + Nagel Ltd | Transport & logistics | 1985 |
| Oy Kultainen Veistos Ab | Financial services | 2018 |
| Oy Kumex Ab | Construction | 1988 |
| Oy Lantmännen Unibake Ab Finland | Manufacturing | 1998 |
| Oy Law Office Matti Honkanen Ltd | Professional & scientific | 1990 |
| Oy Lining Ab | Wholesale & retail | 1980 |
| Oy Luno Ab | Real estate | 1992 |
| Oy M. Selenius Ab | Construction | 1989 |
| Oy MN Brother & Sister Ltd | Hospitality | 2009 |
| Oy Maanterä Ab | Wholesale & retail | 1941 |
| Oy Makromi Ab | Wholesale & retail | 1995 |
| Oy Matkahuolto Ab | Transport & logistics | 1933 |
| Oy Medfiles Ltd | Professional & scientific | 1995 |
| Oy Mehtab Ltd | Hospitality | 2019 |
| Oy Meluton Ab | Manufacturing | 1978 |
| Oy Meluton Group Ab | Manufacturing | 2022 |
| Oy Metropolitan Timber Trading Company | Administrative & support | 1997 |
| Oy Mille mozzarelle S.r.l. | Hospitality | 2010 |
| Oy Monte Alto S A | Real estate | 1990 |
| Oy Motrum Ab | Wholesale & retail | 2005 |
| Oy Movetec Ab | Wholesale & retail | 1988 |
| Oy Multiexpo Ab | Financial services | 1995 |
| Oy Murop Ab | Wholesale & retail | 2019 |
| Oy Nestepaine Ab | Wholesale & retail | 1993 |
| Oy Nordia Produkter Ab | Wholesale & retail | 1987 |
| Oy NordicGSA Ab | Transport & logistics | 2003 |
| Oy Northpoint Finland Ab | Wholesale & retail | 2007 |
| Oy One-Pro Ab | Wholesale & retail | 2004 |
| Oy Onnos Ab | Hospitality | 2013 |
| Oy Operative Management Solutions O.M.D Ltd | Professional & scientific | 2008 |
| Oy Otto Brandt Ab | Wholesale & retail | 1998 |
| Oy PL-Pro Ltd | Information & communication | 2016 |
| Oy Palmtek Ab | Wholesale & retail | 1963 |
| Oy Pharma Facts Finland Ltd | Professional & scientific | 1996 |
| Oy Pharma Nord Ab | Wholesale & retail | 1991 |
| Oy Pinemill Ltd | Manufacturing | 1986 |
| Oy Polarbus Ab | Transport & logistics | 1979 |
| Oy Polarhall Scandinavia Ab | Manufacturing | 1995 |
| Oy Powermatic Huolto Ltd | Manufacturing | 1988 |
| Oy Preesens Ab | Professional & scientific | 1973 |
| Oy Prikatti Ab | Information & communication | 1991 |
| Oy Proamtec Ab | Wholesale & retail | 2019 |
| Oy Rahim-Das Services Ltd | Real estate | 1997 |
| Oy Rajwan Ltd | Hospitality | 2005 |
| Oy Rakennuspartio | Construction | 1976 |
| Oy Rehau Ab | Wholesale & retail | 1973 |
| Oy Reko-Trading Ltd | Transport & logistics | 1993 |
| Oy Rhino Horns Ab | Arts & recreation | 1995 |
| Oy Ribian Ab | Construction | 1990 |
| Oy Rock Physics Finland Ltd | Professional & scientific | 2018 |
| Oy Rohdosvarasto - Drogdepot Ab | Financial services | 2023 |
| Oy Rolf Wilkman Ab | Transport & logistics | 1990 |
| Oy Rollfoods Ab | Wholesale & retail | 1988 |
| Oy Romance Ab | Professional & scientific | 1992 |
| Oy RydCap Ab | Wholesale & retail | 2023 |
| Oy SBN Nordic Ab | Information & communication | 2021 |
| Oy SP-Gifts Ltd | Wholesale & retail | 1998 |
| Oy Samson Ab | Wholesale & retail | 1977 |
| Oy Santtu Engineering Ltd | Wholesale & retail | 1985 |
| Oy Scan-Shipping Ab | Transport & logistics | 1985 |
| Oy Scanpartners International Finland Ltd | Transport & logistics | 1991 |