| AL Enterprises Oy | Professional & scientific | 2025 |
| AMH Supervisors and Consulting Oy/Ltd | Manufacturing | 2026 |
| ARP-Marine Oy | Wholesale & retail | 2024 |
| AUTOVIA Oy | Wholesale & retail | 2009 |
| Ab Clean Holding Oy | Financial services | 2022 |
| Ab Cornia Oy | Hospitality | 2002 |
| Ab Hangö Elektriska - Hangon Sähkö Oy | Construction | 2005 |
| Ab Hangö Loading Company Oy | Transport & logistics | 1992 |
| Agentur L & H Ky | | 1986 |
| Arkitektbyrå Stephan Horn Ab | Professional & scientific | 1984 |
| Automaalaamo Karit Oy | Other services | 2005 |
| Automaalaamo Pertti Jokinen Ky | Other services | 2002 |
| Blavblav Oy | Financial services | 2023 |
| Boost Partners Oy | Professional & scientific | 2023 |
| Brewerystreet Analytics Oy | Professional & scientific | 2025 |
| CR Capital Oy | Financial services | 2025 |
| Case Enterprise Oy | Real estate | 2020 |
| Case LVI Oy | Construction | 2019 |
| Catti Solutions Oy | Information & communication | 2019 |
| Cleenex Oy | Administrative & support | 2022 |
| Delimen oy | Hospitality | 2022 |
| Desanne Oy | Wholesale & retail | 2021 |
| Dope Capital Oy Ab | Administrative & support | 2023 |
| El-installations affär Berndtsson Ab - Sähköasennusliike Berndtsson Oy | Construction | 1995 |
| Eteläkärjen Urheilukauppa Oy | Wholesale & retail | 2008 |
| Famppu Life Oy | Wholesale & retail | 2021 |
| Fastighets Ab Etna | Real estate | 2024 |
| Fastighetsaktiebolaget Hangö busshallar | Real estate | 1987 |
| Ferris Wheel Oy | Financial services | 2002 |
| Five Doors Oy Ab | Real estate | 2025 |
| Fragutech Oy | Energy | 2015 |
| Front Desk Oy | Information & communication | 2002 |
| GynSar Oy | Health & social care | 2026 |
| HaNa Holding Oy | Professional & scientific | 2015 |
| Halttertek Oy | Professional & scientific | 1993 |
| Hangon Autohuolto Oy | Other services | 2021 |
| Hangon Kiinteistöpalvelu Oy | Administrative & support | 1980 |
| Hangon Lasipalvelu Ky | Construction | 2011 |
| Hangon Puhdistamo Oy | Water & waste | 1987 |
| Hangon Talotekniikka Oy | Professional & scientific | 2026 |
| Hangon Terästuote Oy | Manufacturing | 2008 |
| Hangon Väri Oy - Hangö Färg Ab | Manufacturing | 1945 |
| Hangon autopesu Oy | Other services | 2022 |
| Hangon liikunta- ja hyvinvointipalvelut Oy | Arts & recreation | 2020 |
| Hangö Trafik, Friman & Co - Hangon Liikenne, Friman & Co | Transport & logistics | 1967 |
| Hanko Multitask Oy | Construction | 2019 |
| Hanko Rental Oy | Administrative & support | 2010 |
| Hanko Visuals Oy Ab | Information & communication | 2016 |
| Helkama Emotor Oy | Manufacturing | 1986 |
| Helkama Velox Oy | Manufacturing | 2010 |
| Helmacab Oy | Manufacturing | 2009 |
| Höglund Service OY | Real estate | 2023 |
| Instra Oy | Professional & scientific | 2009 |
| Jyrsin - Kierreväline Oy | Manufacturing | 1976 |
| KC Team Ab Oy | Arts & recreation | 2025 |
| KM Steel Oy | Manufacturing | 2013 |
| Ky Supervivo KB | Administrative & support | 2002 |
| Karl-Johan Laine Kb | Manufacturing | 1986 |
| Kb Webowood Ky | Manufacturing | 1984 |
| Kettinens Service Oy Ab | Administrative & support | 2018 |
| KeyMetic Oy | Professional & scientific | 2020 |
| Kirppis Unelma Oy | Wholesale & retail | 2025 |
| Klaus Helminen ja pojat Oy | Administrative & support | 1981 |
| Kodin LVI-Tekniikka Oy | Construction | 2020 |
| Kojo Kaihdin Ky | Wholesale & retail | 1993 |
| Koti Group Oy | Real estate | 2021 |
| Koverhar Shipping Oy Ab | Transport & logistics | 1998 |
| Ky Bamse Golf & Tennis Kb | Arts & recreation | 1985 |
| Kylmätekniikka 2020 Oy | Manufacturing | 2020 |
| LVI Grönroos Oy | Construction | 2016 |
| Latnirp Oy | Professional & scientific | 2019 |
| Lelutivoli Oy | Wholesale & retail | 1992 |
| M-Asunnot Oy | Real estate | 2014 |
| MITT Företag Ab | Arts & recreation | 2020 |
| MS-Steel Oy | Manufacturing | 1989 |
| MainosPrint Oy | Professional & scientific | 2006 |
| Marcon oy | Construction | 2026 |
| Marefax Ab | Real estate | 2015 |
| Marevax Ab Oy | Other services | 2020 |
| Markkinointi Datonet Ky | Financial services | 2000 |
| Martti Poutiainen Oy | Water & waste | 1984 |
| Mary and Li Oy | Wholesale & retail | 2017 |
| MeToPe Oy | Construction | 2015 |
| Minttu Mattsson Oy | Real estate | 2024 |
| Mokkis Stop-In Grill Ab Oy | Hospitality | 2017 |
| Molander Finanssi Oy | Financial services | 1986 |
| Motel & Hotel Silversand Oy | Hospitality | 1995 |
| Musaa Oy | Information & communication | 2011 |
| Måleriaffär Tor-Björn Ekholm Oy Ab | Wholesale & retail | 1982 |
| NORDIC KONCEPT Oy | Real estate | 2018 |
| Napakka & Topakka Oy | Hospitality | 2020 |
| Niemenkärki Oy | Financial services | 2021 |
| Nordic Gym Supply Oy | Wholesale & retail | 2025 |
| Norudin Oy Vihti | Manufacturing | 1993 |
| OY VN Tyre AB | Wholesale & retail | 2019 |
| Opopiste Oy | Education | 2010 |
| Oy Areator Ab | Real estate | 2000 |
| Oy Benitec Hanko Ab | Other services | 1997 |
| Oy Hangö Bilskola - Hangon Autokoulu Ab | Education | 1960 |
| Oy Hangö-Hanko Logistics Ab | Transport & logistics | 2003 |