| Relino Pipe Oy Ab | Construction | 2011 |
| Remilandi Invest Ab | Real estate | 2018 |
| Renbacka Päls Kb | Agriculture & fishing | 1994 |
| RentaTool Ab Oy | Administrative & support | 2022 |
| Rentacon Ab | Administrative & support | 2008 |
| Rentfix Oy | Real estate | 2025 |
| Revisionsbyrå Gripenberg, öppet bolag | Professional & scientific | 1982 |
| Revisionsbyrå Kjellman Ab | Professional & scientific | 2007 |
| Revisionsbyrå Roy Wikström Ab - Tilintarkastustoimisto Roy Wikström Oy | Financial services | 1987 |
| Revisionsbyrå Wiklund Ab | Professional & scientific | 1984 |
| Rimita Green Oy | Wholesale & retail | 2014 |
| Rosecliff Consulting and Invest Oy | Administrative & support | 2020 |
| Ruka Unelma Oy | Administrative & support | 2008 |
| Rönnqvist Invest Ab | Real estate | 2020 |
| Rörman Ab Oy | Construction | 1989 |
| S & J Finnäs Öppet bolag | Manufacturing | 1993 |
| S-T Simonen Oy | Other services | 2025 |
| S.I.C.S - Specialists in Composites Oy Ltd | Professional & scientific | 2014 |
| SAF-Holland Suomi Oy | Wholesale & retail | 2006 |
| SAN Holding Oy | Financial services | 2025 |
| SB Holding AB | Professional & scientific | 2024 |
| SB Services Ab | Construction | 2021 |
| SBJ Invest Ab Oy | Wholesale & retail | 2021 |
| SBS Team Ab | Construction | 2012 |
| SCATA Holding Ab | Manufacturing | 2025 |
| SJ Halli Oy Ab | Real estate | 2012 |
| SJT Invest Ab | Real estate | 2018 |
| SJT Trade Ab | Administrative & support | 2007 |
| SJT Tvätteri Ab | Other services | 2019 |
| SMARTPLAN Ab Oy | Professional & scientific | 2009 |
| SMHJ Investment Oy Ab | Wholesale & retail | 2017 |
| SMM INVEST Ab | Arts & recreation | 2022 |
| SOANIK Ab | Construction | 2026 |
| Sos Data AB OY | Information & communication | 2018 |
| SOULMAN Ab | Manufacturing | 2017 |
| ST Lönnvik Ab | Transport & logistics | 1982 |
| Style by Me AB | Other services | 2015 |
| STore fix Ab | Construction | 2019 |
| STore invest Ab | Financial services | 2021 |
| Symppis Verkosto OY AB | Professional & scientific | 2021 |
| SYPA Impex Ky | Professional & scientific | 1989 |
| Saigon Kitchen öppet bolag | Hospitality | 2020 |
| Salon Hair Team & Technique Oy Ab | Other services | 2016 |
| Salongen i Jeppis Ab | Other services | 2026 |
| Sannier Ab Oy | Information & communication | 2021 |
| Savannah Trend Oy | Wholesale & retail | 2024 |
| Savuapaja Oy | Manufacturing | 2010 |
| Savukatu Holding Ab | Financial services | 2024 |
| Savukatu Invest Ab | Real estate | 2013 |
| Scandic Auto Trading Ab | Wholesale & retail | 2022 |
| Scandic Business Group Ab | Hospitality | 2021 |
| Scandic Marine Systems Ab Oy | Wholesale & retail | 2012 |
| Scata Ab | Manufacturing | 2025 |
| Scavenger's Daughter Öppet Bolag | Arts & recreation | 2024 |
| Scentix Oy | Wholesale & retail | 2023 |
| Search Leadership Growth Consulting Ab Oy | Professional & scientific | 2020 |
| Sebbex Ab Oy | Information & communication | 2010 |
| Seco Bygg Rakennus Ab Oy | Construction | 2019 |
| Seegra Oy | Information & communication | 2020 |
| Seitsemän Sillan LKV Oy | Real estate | 2025 |
| Service GCH Ab | Manufacturing | 2022 |
| Seuraavan vaiheen osakeyhtiö | Financial services | 2025 |
| Shine with him Ab | Wholesale & retail | 2023 |
| Sido Invest AB | Real estate | 2019 |
| Sijada Ab/Oy | Construction | 2010 |
| Simina Partners Oy Ab | Construction | 2006 |
| Sirico Electronics Oy | Manufacturing | 2001 |
| Sjöblom Infra Ab | Construction | 1974 |
| Sjöblom Racing Holding Ab | Financial services | 2022 |
| Sjöblom Rental Oy | Administrative & support | 2025 |
| Sjöblom Group Oy | Professional & scientific | 2023 |
| Skogman Sailing Ab | Administrative & support | 2023 |
| Skrabb Invest Ab | Real estate | 2021 |
| Skrabb Kb | Agriculture & fishing | 1983 |
| Skryyf Ab Oy | Professional & scientific | 2019 |
| Skärilock Homes AB | Financial services | 2019 |
| Slajs Oy | Wholesale & retail | 2024 |
| Slow Flower Garden Oy Ab | Professional & scientific | 2024 |
| Smenas Interior Ab Oy | Wholesale & retail | 2021 |
| SneFam Oy | Financial services | 2021 |
| Snellman Petfood Ab | Manufacturing | 2026 |
| Snellmans Köttförädling Ab | Manufacturing | 2008 |
| Sokols Bygg Ab | Construction | 2018 |
| Solvex Ab | Professional & scientific | 2019 |
| SomeOne Oy | Information & communication | 2021 |
| Sommelier's Selection Ab | Wholesale & retail | 2024 |
| Sonamo Vattenandelslag | Water & waste | 1999 |
| Soulmama Arts Öppet Bolag | Arts & recreation | 2009 |
| Splashes Finland Oy | Administrative & support | 2024 |
| Sponspeed Oy | Professional & scientific | 2021 |
| Sponvelo Oy | Professional & scientific | 2021 |
| Sportmagasinet Mattsson Ab | Wholesale & retail | 1992 |
| Staffing Solution Oy | Administrative & support | 2019 |
| Stall Biskop avoin yhtiö | Agriculture & fishing | 2010 |
| Star-Cargo Oy | Transport & logistics | 1986 |
| Steel Tooling Jakobstad Ab | Wholesale & retail | 2010 |
| Steelprop Finland Ab Oy | Construction | 2012 |
| Stenström Capital Ab | Real estate | 2025 |
| Stephanides Ab | Financial services | 2011 |
| Still Fiske öppet bolag | Agriculture & fishing | 2017 |