| 1695 Sahlström ja Vuorinen Oy | Wholesale & retail | 2020 |
| 314 Holding Oy Ab | Financial services | 2016 |
| 4JC Consulting Oy Ab | Financial services | 2006 |
| A'Pelago Mare Oy Ab | Administrative & support | 2022 |
| A-Jouppi Consulting Oy | Professional & scientific | 2020 |
| A.Strömborg Ab Oy | Construction | 2025 |
| AB KA Söderholm OY | Hospitality | 2015 |
| ABC-Business Control & Development Oy Ltd | Professional & scientific | 1997 |
| AFW-Consulting Oy | Real estate | 2021 |
| AIR-EXPERT Finland Oy | Real estate | 1994 |
| ALT GlitchWorks Oy | Information & communication | 2024 |
| AMJ Service Ab Oy | Other services | 2023 |
| AO-Forestservice AB OY | Agriculture & fishing | 2011 |
| ATH Medical Oy | Health & social care | 2016 |
| AXAplan Oy | Information & communication | 2019 |
| Aareton Oy | Construction | 1994 |
| Aava Capital Oy | Financial services | 2007 |
| Ab Aither Oy | Financial services | 2014 |
| Ab Archipelago Solar Oy | Construction | 2021 |
| Ab BLN-Woods Ltd | Professional & scientific | 2012 |
| Ab DU-tec FIX Oy | Administrative & support | 2015 |
| Ab DU-tec LUX Oy | Construction | 2016 |
| Ab DU-tec NET Oy | Construction | 2016 |
| Ab DU-tec Oy | Construction | 2011 |
| Ab Dispomera Oy | Real estate | 2021 |
| Ab Handix Oy | Wholesale & retail | 2018 |
| Ab Juhlakulma Oy | Wholesale & retail | 2021 |
| Ab Julett Oy | Other services | 2024 |
| Ab Klabbat & Klart Oy | Agriculture & fishing | 2013 |
| Ab Par-Is Oy | Real estate | 1990 |
| Ab Pargas Fysiotjänst Paraisten Fysiopalvelu Oy | Health & social care | 1986 |
| Ab Pargas Ljus - Paraisten Valo Oy | Construction | 1982 |
| Ab Pargas Trä-Paraisten Puu Oy | Professional & scientific | 2010 |
| Ab Parmilk Oy | Agriculture & fishing | 1996 |
| Ab Partaxi Oy | Transport & logistics | 1977 |
| Ab Rakennuspalvelu SAHA & CO Oy | Construction | 2020 |
| Ab Realplan Oy | Professional & scientific | 2023 |
| Ab Renthall Oy | Administrative & support | 2019 |
| Ab Roneco Oy | Administrative & support | 2006 |
| Ab Ronja Marin Ltd | Transport & logistics | 2000 |
| Ab Saaristokivi Skärgårdsten Oy | Construction | 1993 |
| Ab Skäri Ben - Saaristo Ben Oy | Construction | 2022 |
| Ab Sorpo Södergård Oy | Manufacturing | 1998 |
| Ab Tedwa Oy | Wholesale & retail | 1989 |
| Ab Vikman Services Oy | Administrative & support | 2024 |
| Ab Åbolands Fastigheter AFM - Turunmaan Kiinteistöt Oy LKV | Real estate | 1989 |
| Ab Ö-Strand Fastigheter Oy | Real estate | 2017 |
| Ab Ö-Strand Oy | Transport & logistics | 2017 |
| Aboprint Oy | Professional & scientific | 2000 |
| Acmer Oy Ab | Professional & scientific | 2022 |
| Aeternum Oy Ab | Real estate | 2018 |
| Ahair Oy | Real estate | 1992 |
| Aideo Ab | Information & communication | 2023 |
| Aimo-Tuote Oy | Manufacturing | 2018 |
| Airduo Oy | Construction | 1996 |
| Airisto Insulation Oy | Construction | 2025 |
| Airiston Helmi Oy | Real estate | 2007 |
| Airiston Kruunu Oy | Arts & recreation | 2007 |
| Airiston Matkailukeskus Oy | Real estate | 1986 |
| Airiston Putkityö Oy | Construction | 2003 |
| Airiston pohjoisranta Oy | Professional & scientific | 2006 |
| Airon Oy | Construction | 1995 |
| Airpoint Oy | Construction | 2010 |
| Al-Mill Finland Oy | Manufacturing | 1996 |
| Alexander & Alexander Ab | Professional & scientific | 2020 |
| Almecon Oy Ab | Wholesale & retail | 1995 |
| Alvik Oy | Wholesale & retail | 2004 |
| Amokabel Oy | Wholesale & retail | 2025 |
| Amra Oy | Financial services | 1988 |
| Andelslaget Pargas-Nagu Skattetjänst | Professional & scientific | 1988 |
| Anders Kjellman Consulting Oy Ab | Professional & scientific | 2001 |
| Anselm Kb | Financial services | 2016 |
| Anvir Oy | Wholesale & retail | 1991 |
| AnyDeal Oy | Administrative & support | 2007 |
| ArGC Arena Ab Oy | Arts & recreation | 2024 |
| Archipelagia Golf Ab Oy | Arts & recreation | 1995 |
| Archipelago Design Oy Ab | Professional & scientific | 2017 |
| Archipelago Technics Oy | Information & communication | 2006 |
| Archipelago Wincat Charter & Travel Oy Ab | Transport & logistics | 2020 |
| Archipelagooo Finland Oy | Manufacturing | 2022 |
| Archipelagoproduction Oy/Ab | Wholesale & retail | 2020 |
| Arcipelago Assets Ab | Construction | 2026 |
| Arkkitehtitoimisto Rinne & Seppälä | Professional & scientific | 1991 |
| Arkkitehtuuristudio Luomus Oy | Professional & scientific | 2019 |
| Art Bank Oy Ab | Wholesale & retail | 2013 |
| Arumi Oy | Construction | 2019 |
| Asimo Oy | Administrative & support | 1996 |
| Aspholm Fisk Öppet Bolag | Agriculture & fishing | 1994 |
| Aurakoulutus Oy | Education | 1999 |
| Aurinkokaari Oy | Financial services | 2020 |
| Autoverkstad A & A Hellberg Oy Ab | Other services | 1967 |
| Avamarine Finland Oy | Professional & scientific | 2022 |
| Avara Consulting Oy | Professional & scientific | 2021 |
| Axo Oy Ab | Agriculture & fishing | 1990 |
| BEROS Ab | Professional & scientific | 2026 |
| BH-rör Ab | Construction | 2006 |
| Bodvest OY | Professional & scientific | 2022 |
| BR Tjänst Ab | Information & communication | 2024 |
| BRO Invest Oy | Financial services | 2011 |
| BRO Leasing Oy | Administrative & support | 2016 |