| Sotto Tikkurila Oy | Hospitality | 2024 |
| Sotungin Sävel Sinulle Oy Ab | Arts & recreation | 1997 |
| Sotungin Vesiosuuskunta | Water & waste | 2018 |
| Soudal Oy | Manufacturing | 2018 |
| Soukola & Erdogan avoin yhtiö | Hospitality | 2019 |
| Soundnation Oy | Arts & recreation | 2022 |
| Source4Success Ky | Professional & scientific | 2015 |
| Souris Solutions Oy | Administrative & support | 2023 |
| Sovele Oy | Professional & scientific | 2014 |
| Sovia Media Oy | Information & communication | 2021 |
| Spa Lotus Dixi Oy | Other services | 2022 |
| Space Spider Oy | Information & communication | 2025 |
| SparkBest Oy | Administrative & support | 2016 |
| SparkWise Electric Oy | Construction | 2024 |
| Sparkbe Oy | Information & communication | 2008 |
| Sparker Oy | Professional & scientific | 2023 |
| Sparkling Twilight Queens Oy | Agriculture & fishing | 2025 |
| Speci Audit Oy | Financial services | 2012 |
| Special Events Finland Oy | Professional & scientific | 2022 |
| Special Lift Oy Finland | Wholesale & retail | 2006 |
| Special Security Group Oy | Administrative & support | 2023 |
| Special Task Force Oy | Transport & logistics | 2022 |
| Specsavers Espoo Ainoa Oy | Wholesale & retail | 2018 |
| Specsavers Espoo Lippulaiva Oy | Wholesale & retail | 2021 |
| Specsavers Espoo Sello Oy | Wholesale & retail | 2018 |
| Specsavers Finland Oy | Wholesale & retail | 2005 |
| Specsavers Helsinki Aleksi Oy | Wholesale & retail | 2017 |
| Specsavers Helsinki Malmi Oy | Wholesale & retail | 2017 |
| Specsavers Helsinki Pasila MOT Oy | Wholesale & retail | 2018 |
| Specsavers Helsinki Redi Oy | Wholesale & retail | 2018 |
| Specsavers Helsinki Vuosaari Oy | Wholesale & retail | 2021 |
| Specsavers Hyvinkää Oy | Wholesale & retail | 2016 |
| Specsavers Itäkeskus Oy | Wholesale & retail | 2016 |
| Specsavers Jyväskylä CC Oy | Wholesale & retail | 2021 |
| Specsavers Jyväskylä Seppä Oy | Wholesale & retail | 2017 |
| Specsavers Järvenpää Oy | Wholesale & retail | 2019 |
| Specsavers Kajaani Oy | Wholesale & retail | 2019 |
| Specsavers Kannelmäki Oy | Wholesale & retail | 2016 |
| Specsavers Kokkola Oy | Wholesale & retail | 2022 |
| Specsavers Kuopio Oy | Wholesale & retail | 2008 |
| Specsavers Lahti Oy | Wholesale & retail | 2018 |
| Specsavers Lappeenranta Oy | Wholesale & retail | 2018 |
| Specsavers Lohja Oy | Wholesale & retail | 2020 |
| Specsavers Pori Oy | Wholesale & retail | 2022 |
| Specsavers Raisio Mylly Oy | Wholesale & retail | 2016 |
| Specsavers Rauma Oy | Wholesale & retail | 2018 |
| Specsavers Savonlinna Oy | Wholesale & retail | 2024 |
| Specsavers Spare 27 Oy | Wholesale & retail | 2022 |
| Specsavers Spare 29 Oy | Wholesale & retail | 2024 |
| Specsavers Spare 30 Oy | Wholesale & retail | 2024 |
| Specsavers Spare 31 Oy | Wholesale & retail | 2024 |
| Specsavers Spare 9 Oy | Wholesale & retail | 2018 |
| Specsavers Tampere Trio Oy | Wholesale & retail | 2017 |
| Specsavers Tampere Turtola Oy | Wholesale & retail | 2017 |
| Specsavers Turku Keskusta Oy | Wholesale & retail | 2017 |
| Specsavers Turku Länsikeskus Oy | Wholesale & retail | 2022 |
| Specsavers Turku Skanssi Oy | Wholesale & retail | 2017 |
| Specsavers Vaasa Oy | Wholesale & retail | 2008 |
| Specsavers Vantaa Jumbo Oy | Wholesale & retail | 2018 |
| Specsavers Vantaa Myyrmäki Oy | Wholesale & retail | 2019 |
| Specsavers Vantaa Tikkurila Oy | Wholesale & retail | 2022 |
| Specsavers Varkaus Oy | Wholesale & retail | 2020 |
| Specsavers Verkkokauppa Oy | Wholesale & retail | 2019 |
| Specsys Engineering Oy | Professional & scientific | 2004 |
| Spectrum Law Oy | Professional & scientific | 2021 |
| Speed4Life Oy | Wholesale & retail | 2011 |
| Speissi Oy | Professional & scientific | 2002 |
| SpellBound Oy | Professional & scientific | 2022 |
| Spelsberg Oy | Wholesale & retail | 2019 |
| Spexvel Oy | Information & communication | 2025 |
| Spice Mart Oy | Wholesale & retail | 2024 |
| Spintex Oy | Construction | 2023 |
| Spinvest Oy | Financial services | 2014 |
| Spirax Oy | Wholesale & retail | 1979 |
| Spoke Consulting Oy | Professional & scientific | 2018 |
| SponComp 2 Oy | Professional & scientific | 2022 |
| Sport - Jarkko Rinne Oy | Education | 2022 |
| Sport Family Oy | Information & communication | 2018 |
| Sportclean Oy | Administrative & support | 1993 |
| Sportia-Lahti Oy | Wholesale & retail | 1969 |
| Sportlund Oy | Other services | 2012 |
| Sportti Kupla Oy | Hospitality | 2008 |
| Sportuna Oy | Arts & recreation | 1999 |
| Spottimedia Oy | Information & communication | 2021 |
| Spring Electronics Oy | Wholesale & retail | 2003 |
| Spring Invest Oy | Wholesale & retail | 2003 |
| Spring makeup & hair Oy | Other services | 2023 |
| Springcape lodges Oy | Hospitality | 2020 |
| SproTili Oy | Professional & scientific | 2024 |
| Sprucester Oy | Hospitality | 2021 |
| Spurs Invest Oy | Financial services | 2007 |
| Stable 41 Oy | Arts & recreation | 2014 |
| Stadin Kebab Oy | Hospitality | 2019 |
| Stadin Talot Oy | Construction | 2013 |
| Stadin Valioruoka Oy | Hospitality | 2026 |
| Stadin vakioputkitus Oy | Construction | 2004 |
| StaffGroup Oy | Administrative & support | 2022 |
| Stage Manager Finland Oy | Professional & scientific | 2009 |
| Stagnum Oy | Professional & scientific | 2015 |
| Stainvere Oy | Construction | 2013 |