| Nastolan Kiinteistöpalvelu Oy | Administrative & support | 2024 |
| Nastolan Kulttuurikiinteistöt Oy | Real estate | 1996 |
| Nastolan Kuntokeskus Ky | Health & social care | 1985 |
| Nastolan Nastikka Oy | Hospitality | 2001 |
| Nastolan Taksi Oy | Transport & logistics | 1986 |
| Nastolan Tarvikeosa Ky | Wholesale & retail | 1990 |
| Nastolan Teollisuusmaalaamo Ky | Manufacturing | 1989 |
| Nastolan Tilitoimisto Oy | Professional & scientific | 1981 |
| Nastolan pk avoin yhtiö | Hospitality | 2023 |
| Nastolan teollisuushuolto Ky | Manufacturing | 2016 |
| Nastolan vuokraus ja rakennustyöt Oy | Administrative & support | 1995 |
| NeliötVuokralle Oy | Real estate | 2026 |
| Nipux Oy | Professional & scientific | 2015 |
| Nordic Timber Labs Oy | Manufacturing | 2022 |
| Nuem Invest Oy | Real estate | 2021 |
| NumMedia Oy | Information & communication | 2023 |
| NurmiSET Oy | Health & social care | 2022 |
| O. Veijalainen Oy | Real estate | 1979 |
| Ofria-Palvelu ky | Administrative & support | 2013 |
| Opester Oy | Education | 2023 |
| Optikko Nyman Oy | Wholesale & retail | 1973 |
| Ossian Invest Oy | Financial services | 2024 |
| Oy Beanova Ab | Professional & scientific | 1993 |
| Oy Heavens Gate Ab | Professional & scientific | 1987 |
| Oy Holo Solutions Ltd. | Information & communication | 1999 |
| Oy Intermach Ltd. | Wholesale & retail | 1993 |
| Oy Lazerman AB | Agriculture & fishing | 2019 |
| Oy Ruuskari Ab | Wholesale & retail | 2000 |
| Oy Saftiger Ab | Hospitality | 1990 |
| PR Timantti Oy | Construction | 2011 |
| PS-Power Oy | Arts & recreation | 2017 |
| PTL Holding Oy | Financial services | 2026 |
| Pajulahden Palvelut Oy | Arts & recreation | 1995 |
| Paratex Oy | Wholesale & retail | 1991 |
| Pedro Oy | Manufacturing | 2006 |
| Peekasi oy | Transport & logistics | 2019 |
| Peikkometsä Lumo Oy | Education | 2024 |
| Perhekoti Sylvöniemi Oy | Health & social care | 1996 |
| Perintöasiat Jokinen Tero Ky | Professional & scientific | 2010 |
| Pikkiksen paja Oy | Other services | 2020 |
| Pohjantähti Kiinteistöt Oy | Real estate | 2024 |
| Pragpump Oy | Financial services | 2025 |
| Pre car investment Oy | Wholesale & retail | 2021 |
| Priocon Pipe Welding Oy | Manufacturing | 2017 |
| Pro EA avoin yhtiö | Education | 2008 |
| ProHitsaus Suomi Oy | Construction | 2023 |
| Promotex Oy | Wholesale & retail | 2011 |
| Päijän-Vene Oy | Manufacturing | 1971 |
| Q-Siivouspalvelut Oy | Administrative & support | 2021 |
| Queer Oy | Health & social care | 2021 |
| RPJ-Invest Oy | Real estate | 2005 |
| RS - Logi Oy | Transport & logistics | 2015 |
| RWS-Engineering Oy | Professional & scientific | 1995 |
| Rakennus Häkli OY | Construction | 2019 |
| Rakennus J Ora Oy | Construction | 2015 |
| Rakennus Jari Kaikkonen Ky | Construction | 2003 |
| Rakennus-Klami Ky | Construction | 1983 |
| Rakennusedustus Risto Kananen Ky | Wholesale & retail | 1985 |
| Rakennusliike Virtanen Oy | Construction | 2014 |
| Rakennusyritys H&H Oy | Construction | 2022 |
| Raksavahti Oy | Construction | 2022 |
| Raute Oyj | Manufacturing | 1908 |
| Raute WPM Oy | Manufacturing | 1995 |
| Ravintola Ailin Oy | Hospitality | 2021 |
| Ravintola Nastola avoin yhtiö | Hospitality | 2022 |
| Re-Zipper Oy | Manufacturing | 2026 |
| Rekonsto Oy | Construction | 2005 |
| RemonttiEemeli Oy | Construction | 2021 |
| Retiro-yhtiöt Oy | Financial services | 2024 |
| Rokdent Oy | Health & social care | 2020 |
| Room4u Oy | Professional & scientific | 2014 |
| Ropet Ky | Construction | 2017 |
| RuusPuu avoin yhtiö | Manufacturing | 2017 |
| Scip Windpower Consulting OY | Professional & scientific | 2016 |
| Sipimet OY | Manufacturing | 2011 |
| Salpro Oy | Wholesale & retail | 2019 |
| Seek Detect Oy | Administrative & support | 2026 |
| Sekvel Oy | Real estate | 2003 |
| Selka Oy | Manufacturing | 2019 |
| Selmeka Oy | Manufacturing | 2023 |
| Sepon Putkityö Oy | Construction | 2014 |
| Sharper Words OY | Professional & scientific | 2019 |
| Siskokset Idalin avoin yhtiö | Wholesale & retail | 2024 |
| Sokuriina Oy | Hospitality | 2012 |
| Soramo Invest Oy | Financial services | 2011 |
| Souvi Group Osk | Professional & scientific | 2018 |
| Steelmans Oy | Manufacturing | 1989 |
| Sublia Oy | Administrative & support | 2025 |
| Suomen Kaideturva Oy | Construction | 2026 |
| Suomen Kangaspaino Oy | Manufacturing | 2021 |
| Suomen Mainostaulu Oy | Professional & scientific | 2021 |
| SuomiKauha Oy | Manufacturing | 2017 |
| Sähkötoimisto Aarno Ahonen Oy | Construction | 1990 |
| TILLACON Ltd Oy | Professional & scientific | 2023 |
| TL Kiinteistöt Oy | Real estate | 2017 |
| Toeca OY | Education | 2013 |
| Taksipulu Oy | Administrative & support | 2023 |
| Tammer Finland Oy | Construction | 2011 |
| TapsTek Oy | Manufacturing | 2024 |
| Team Ari Viander & Krista Skutnabb Oy | Arts & recreation | 2014 |