| Oy Hotel Regatta Ab | Hospitality | 2010 |
| Oy Hotel Regatta Seaside Ab | Hospitality | 2020 |
| Oy Itämeren Portti - Östersjö Port Ab | Real estate | 1990 |
| Oy Jaidan | Professional & scientific | 2022 |
| Oy Kone-Forum Ltd | Wholesale & retail | 1993 |
| Oy Kuljetus K. Grahn Transport Ab | Transport & logistics | 1978 |
| Oy Mannerin Konepaja Ab | Manufacturing | 2022 |
| Oy Mocis Firma Ab | Other services | 2021 |
| Oy N-Å Nyströmin Rakennuspalvelu-N-Å Nyströms Byggservice Ab | Construction | 1994 |
| Oy Netpac Ab | Professional & scientific | 2020 |
| Oy Orrebo Business Ab | Wholesale & retail | 1996 |
| Oy Oskar Eriksson Ab | Real estate | 1903 |
| Oy Osterlund Ab | Wholesale & retail | 2003 |
| Oy Peter Ekroth Ab | Administrative & support | 1991 |
| Oy Regatta SPA Ab | Other services | 2014 |
| Oy SaariTours Ab | Administrative & support | 2007 |
| Oy Santalan Betoni - Sandö Betong Ab | Manufacturing | 1978 |
| Oy Sirpa Niemi Ab | Financial services | 2025 |
| Oy Ulla-Dress Ab | Wholesale & retail | 1981 |
| Oy Victor Ek Ab | Transport & logistics | 1923 |
| Oy ViskoTeepak Ab | Manufacturing | 2007 |
| Oy Wickman Transport Ab | Transport & logistics | 1989 |
| Paniox Finnland Oy | Professional & scientific | 2001 |
| Par Mare Oy | Transport & logistics | 2019 |
| Peak Living Oy | Professional & scientific | 2017 |
| Peninsula Oy | Professional & scientific | 2016 |
| Pensionat Tellina - Hangon Matkailu Ky | Hospitality | 1998 |
| Pensionat Tellina Oy | Hospitality | 2020 |
| Pesula Iira Ky | Other services | 1985 |
| Playa mobile Oy | Wholesale & retail | 2001 |
| Polykreon Oy Ab | Professional & scientific | 2024 |
| Polymerik Oy | Wholesale & retail | 2010 |
| Prerak Ab Oy | Construction | 1983 |
| Pro Hipax Oy | Wholesale & retail | 2023 |
| ProVoima Oy | Manufacturing | 2025 |
| Promara Oy | Professional & scientific | 1989 |
| Pärlan hammaslääkärit by Ari and Hana oy | Health & social care | 2022 |
| R & R Nordic Oy | Professional & scientific | 1998 |
| RETH Oy | Hospitality | 2026 |
| RMÖ-Hallit Oy | Real estate | 1999 |
| Raaseporin ja Hangon Asbestikartoitus Oy | Construction | 2016 |
| Rakennustoimisto Jarnox Ky | Construction | 1999 |
| Ranncorp Finland Oy | Financial services | 2008 |
| Raution Rauta ja Väri Ky | Wholesale & retail | 1983 |
| Reader Stage Oy | Wholesale & retail | 2010 |
| Regattalämpö Oy | Real estate | 1973 |
| Rolky Oy | Hospitality | 2024 |
| Romvärme Ab | Energy | 1975 |
| Rumbita Oy | Arts & recreation | 2010 |
| SGS Invest Oy Ab | Real estate | 2020 |
| SRJV Capital Oy | Construction | 2023 |
| Sabina Poutiainen Ky | Transport & logistics | 2009 |
| Sarpoma Oy | Professional & scientific | 2023 |
| Sauna360 Group Oy | Financial services | 2006 |
| Sauna360 Oy | Manufacturing | 1999 |
| Scandinavian Yacht Trading Ltd Oy Ab | Wholesale & retail | 2009 |
| Selanto Oy | Administrative & support | 2022 |
| Snell's Elektriska Ab | Construction | 1995 |
| Sotningstjänst Rune Råberg Kb | Administrative & support | 2018 |
| South Tip Brewing Company Ab | Manufacturing | 1996 |
| Spin off Mill Ky | Professional & scientific | 2016 |
| Stenstroem Investments Oy | Real estate | 2025 |
| Studio Tomi Parkkonen Oy | Professional & scientific | 2008 |
| SuMuMe Oy | Hospitality | 2020 |
| Subvia Oy | Health & social care | 2020 |
| Sune Lundin Kommanditbolag - Sune Lundin Kommandiittiyhtiö | Wholesale & retail | 1972 |
| Sunrise Services & Solutions Oy | Administrative & support | 2026 |
| Suomen Tilannemarkkinointi Oy | Financial services | 1996 |
| Suomen Vapaasatama Oy - Finlands Frihamn Ab | Transport & logistics | 1960 |
| Suomen WhyNot Oy | Education | 2015 |
| TAC Threat Assessment Consulting Oy | Administrative & support | 2022 |
| TAP2 Investment Partners Oy | Real estate | 2020 |
| Taksi Hanko Oy | Transport & logistics | 2024 |
| Teollisuusmaalaamo Han-Corro Ky | Manufacturing | 1998 |
| Tilitoimisto Nuordata Oy | Professional & scientific | 2015 |
| Tixia Oy | Professional & scientific | 2000 |
| Tvärminne Båtvarv Oy | Manufacturing | 2018 |
| Tvättgaraget Oy Ab | Other services | 2023 |
| Täktom Skola Oy | Education | 2023 |
| Uranum Oy | Professional & scientific | 2000 |
| VALO hanko Oy | Manufacturing | 2026 |
| Valuaatio Oy | Professional & scientific | 2019 |
| Vattenpost vesiosuuskunta | Water & waste | 2019 |
| Veneveistämö Janne Pettersson Oy | Manufacturing | 2014 |
| Vi Care ab | Health & social care | 2008 |
| Viking Motel Oy | Hospitality | 2016 |
| Villa Classic Hanko Oy | Administrative & support | 2005 |
| Visit Hanko Finland Oy Ab | Administrative & support | 1989 |
| Visustamo Oy | Professional & scientific | 2024 |
| Wallenius Wilhelmsen Ocean AS, Suomen sivuliike | Transport & logistics | 1999 |
| WebStock Oy | Information & communication | 2020 |
| Winfor Oy Ab | Construction | 2007 |
| Woble Genomics Oy | Professional & scientific | 2016 |
| Yogassi Oy | Arts & recreation | 2015 |
| i+D Agency Oy | Professional & scientific | 2009 |
| powbro oy | Professional & scientific | 2020 |
| Österman Consulting Oy | Professional & scientific | 2024 |