| Ruka Nordic Oy | Arts & recreation | 2025 |
| Ruka911 Kiinteistöpalvelut Oy | Administrative & support | 2020 |
| RukaVillaService Oy | Hospitality | 2018 |
| Rukakaiku Oy | Hospitality | 2005 |
| Rukakaluste Oy | Manufacturing | 1989 |
| Rukamaja Oy | Real estate | 2024 |
| Rukan Huvila & Huolto Oy | Hospitality | 2018 |
| Rukan Karhu Kiinteistöt Oy | Hospitality | 1989 |
| Rukan Konemestarit Oy | Manufacturing | 2021 |
| Rukan Laaturakennus Oy | Construction | 2024 |
| Rukan Lääkäripalvelu Oy | Health & social care | 1989 |
| Rukan Urakointi Karjalainen -avoin yhtiö | | 1981 |
| Rukasaukko Oy | Hospitality | 2023 |
| Ruska Laukka Ky | Education | 2006 |
| Ruska Palvelut Oy | Professional & scientific | 2022 |
| Ruva-Aho Oy | Hospitality | 2016 |
| S. Pätsi-racing kommandiittiyhtiö, Sauli Pätsi | Arts & recreation | 1989 |
| Sendon OY | Construction | 2010 |
| SP Tallit Oy | Real estate | 2021 |
| SPK Group Oy | Wholesale & retail | 2021 |
| Saapunkijärven Lomat Oy | Hospitality | 2023 |
| Safe Group Security Oy | Other services | 2017 |
| Salavi Oy | Financial services | 2026 |
| Salpa-Consulting Oy | Real estate | 2022 |
| Sandscape Oy | Arts & recreation | 2018 |
| Sanitar Oy | Administrative & support | 2016 |
| SanninKodit Oy | Health & social care | 2025 |
| Savikenkä avoin yhtiö | Real estate | 1981 |
| Savu Financial Consulting Oy | Professional & scientific | 2024 |
| SeMassi Oy | Construction | 2006 |
| SePan Invest Oy | Wholesale & retail | 2018 |
| Seikkailuapinat Oy | Administrative & support | 2015 |
| Seitsemän Tähden Rakennus Oy | Construction | 2009 |
| Sella parturi Oy | Other services | 2026 |
| Seppo Klemetti Ky | Transport & logistics | 1987 |
| Seviset Oy | Health & social care | 2004 |
| Siikaluomat Oy | Transport & logistics | 2004 |
| Siikarit Oy | Agriculture & fishing | 2024 |
| Silmu Solutions Oy | Professional & scientific | 2021 |
| Silvaset Oy | Professional & scientific | 1989 |
| Sipulisanni Oy | Hospitality | 2010 |
| Snow Track Kuusamo Oy | Construction | 2004 |
| Sora-Kumppanit-avoin yhtiö | Mining & quarrying | 1992 |
| Sotkamon Rahtipurkitus Oy | Wholesale & retail | 2007 |
| Sportimi ky | Wholesale & retail | 1999 |
| Star Cottages Ruka Oy | Hospitality | 2008 |
| Stick Entertainment Oy | Information & communication | 2025 |
| Sunflower Kitchen Oy | Hospitality | 2026 |
| Suomen Luontomatkailu Oy | Administrative & support | 2023 |
| Suoraniemen Lomat Oy | Hospitality | 2016 |
| Supravoice Oy | Manufacturing | 1990 |
| Suujoki Group Oy | Real estate | 2022 |
| Suunnittelutoimisto Karjalainen Oy | Professional & scientific | 2005 |
| Suxem Oy | Professional & scientific | 2022 |
| Sänkikankaan Jätevesiosuuskunta | Water & waste | 2010 |
| Sähköasennus Romppainen Oy | Construction | 2007 |
| Sähköpalvelu JP Oy Kuusamo | Construction | 2014 |
| Sähkötyö E Lämsä Oy | Construction | 1997 |
| Säkkinen & Viljanen avoin yhtiö | Hospitality | 1995 |
| Säkkinen Group Oy | Professional & scientific | 2021 |
| T. Ronkainen Oy | Financial services | 2022 |
| TK Carfix Kommandiittiyhtiö | Other services | 2005 |
| TM Tune Oy | Other services | 2023 |
| TORNAK adventures Oy | Administrative & support | 2019 |
| TTK-Innovations Oy | Professional & scientific | 2012 |
| Taatus Oy | Administrative & support | 2009 |
| Taiga Bear Kuusamo Oy | Administrative & support | 2023 |
| Taiga Eco Apartments Oy | Administrative & support | 2018 |
| Taiga Eco Hotels Oy | Administrative & support | 2024 |
| Takkusalmen Vesiosuuskunta | Water & waste | 1990 |
| Taksi Määttä Oy | Transport & logistics | 2026 |
| Taksipalvelut Lämsä Ky | Transport & logistics | 1995 |
| Taksipalvelut Palosaari Oy | Transport & logistics | 2024 |
| Taxi Ihqu Oy | Transport & logistics | 2024 |
| Team Hanhela Oy | Administrative & support | 2024 |
| Team Touhula Oy | Wholesale & retail | 2006 |
| Technolabs OY | Information & communication | 2022 |
| Teemu Tornberg Oy | Education | 1982 |
| TeeÄm Lomahuolto Oy | Hospitality | 2020 |
| Terja's Arctic Life Oy | Wholesale & retail | 2024 |
| Tervo Group Oy | Health & social care | 2003 |
| Teräs NEK Oy | Other services | 2003 |
| Tetta Group Oy | Hospitality | 2017 |
| The French Café Oy | Hospitality | 2022 |
| ThermiaHirsi Oy | Construction | 2023 |
| Tilintarkastus Tyni Oy | Professional & scientific | 2008 |
| Tilinviilaaja Oy | Administrative & support | 2026 |
| Tilitoimi Kumpula Ky | Real estate | 1989 |
| Tommi O. Niskanen avoin yhtiö | Wholesale & retail | 2008 |
| Torin Vintti Oy | Hospitality | 2025 |
| Torix Oy | Wholesale & retail | 2014 |
| Trans Tiermas Oy | Transport & logistics | 2000 |
| Tropiikin Rantasauna Oy | Real estate | 2016 |
| Trukkisafety Oy | Wholesale & retail | 2024 |
| Tundra Ceramics & Gastronomy Oy | Hospitality | 2025 |
| Tunturi-Sauna Oy | Hospitality | 2005 |
| Tunturintaika Oy | Wholesale & retail | 2024 |
| Tunturirakennus Oy | Construction | 2004 |
| Tuokuri Oy | Wholesale & retail | 2000 |
| Tuomisen Perhekoti Oy | Health & social care | 2007 |