| Mikrant Oy | Wholesale & retail | 2020 |
| Minikai Oy | Hospitality | 2010 |
| More Than Fishing Oy | Administrative & support | 2016 |
| Morisan Oy | Wholesale & retail | 2018 |
| Munkkiniemen Kiinteistöt Oy | Real estate | 2016 |
| Muoti-Leena Oy | Wholesale & retail | 2006 |
| Muotiliike Olivia Oy | Wholesale & retail | 2011 |
| Murajoki Oy | Real estate | 2008 |
| Muve Mania Oy | Real estate | 2017 |
| Mysteerikoulu Ma-Ra Oy | Arts & recreation | 2020 |
| Myyntipalvelu Harald Oy | Other services | 2023 |
| Neloshalli Oy | Real estate | 1988 |
| Nepal Momo Square OY | Hospitality | 2015 |
| Nethit Systems Ltd Oy | Information & communication | 2002 |
| Nihilo Oy | Administrative & support | 2020 |
| Nimbel Oy | Construction | 2023 |
| Nordic Advanced Composites Oy | Manufacturing | 2022 |
| Nordic Data Processing Oy | Information & communication | 2026 |
| Nordix Work Wear Oy | Wholesale & retail | 2022 |
| Normipinta Oy | Manufacturing | 2012 |
| Nukkekoti Väinölä Oy | Manufacturing | 2022 |
| Nuohouspalvelu R.Paassilta Oy | Administrative & support | 2020 |
| Näköjään OY | Health & social care | 2021 |
| Oja Group Oy | Professional & scientific | 2023 |
| Oklas Oy | Financial services | 2024 |
| Olanja Oy | Real estate | 2020 |
| Oldemar Oy | Construction | 2021 |
| Ole.Fit Forssa Oy | Arts & recreation | 2023 |
| OlutMylly Oy | Manufacturing | 2014 |
| Osatori Oy | Wholesale & retail | 1976 |
| Osto- ja myyntiliike ullakon löydöt Oy | Wholesale & retail | 2022 |
| Otter Life Oy | Professional & scientific | 2021 |
| Oy Forssa Pilsner Fabrik Ab | Manufacturing | 2019 |
| Oy Jopamac Ab | Professional & scientific | 1988 |
| Oy Nelcomp Ltd. | Manufacturing | 1996 |
| Oy Saunawise Ltd | Professional & scientific | 2019 |
| Oy Teema Line Ltd | Manufacturing | 1984 |
| P & P Consulting Oy | Professional & scientific | 2012 |
| P-P Talohuolto Ky | Administrative & support | 1992 |
| P.E. Works Oy | Construction | 2019 |
| P.Laakko Oy | Transport & logistics | 2008 |
| PRT-Palvelut Oy | Wholesale & retail | 1996 |
| PSL Oy Puhtaan Sisäilman Lähettiläs | Professional & scientific | 2008 |
| PTM-Systems Oy | Construction | 2009 |
| Pa-Ka Emilia Oy | Other services | 2013 |
| Paavolan Järvikiinteistöt II Oy | Real estate | 1992 |
| Pakkaava Oy | Administrative & support | 2024 |
| Palvelurakentajat Oy | Construction | 1975 |
| Pantex-Pesu Oy | Other services | 1997 |
| Pantex-Vuokraus Oy | Other services | 1996 |
| Parmair ilmanvaihto Oy | Wholesale & retail | 2017 |
| Parmarine Oy | Manufacturing | 2000 |
| Parturi-kampaamo Jaana Lounas Ky | Other services | 1982 |
| Parturi-kampaamo StudioKuus Oy | Other services | 2020 |
| Paulan Fysioterapia Oy | Health & social care | 1996 |
| Pauliita Oy | Other services | 2021 |
| Pehkola Oy | Real estate | 1984 |
| Pekka Markula Ky | Wholesale & retail | 1980 |
| Pellilän Autotyö Oy | Other services | 1998 |
| Peltiguru oy | Other services | 2024 |
| Peltisepänliike Reijo Annunen Oy | Real estate | 1978 |
| Peltosiemen Oy | Agriculture & fishing | 2002 |
| PerRak Oy | Professional & scientific | 2016 |
| Peräjoen kone ja kuljetus avoin yhtiö | Transport & logistics | 2016 |
| Pienyrityspalvelu Alén Oy | Professional & scientific | 1996 |
| Pihapuupalvelu Jussi Korsi Oy | Administrative & support | 2023 |
| Pikku Pistrina Oy | Hospitality | 2020 |
| Pindaamrak Oy | Construction | 2026 |
| Pit BBQ International Oy | Hospitality | 2023 |
| Plantec Oy | Professional & scientific | 2007 |
| Playpal Oy | Information & communication | 2013 |
| Pohjois-Karjalan Laiva Oy | Transport & logistics | 2022 |
| Populaarikulttuuriosuuskunta Pommi | Arts & recreation | 2012 |
| Potentia Creativa Oy | Arts & recreation | 2024 |
| Pro Restauro Oy | Professional & scientific | 2023 |
| Pro8 Oy | Wholesale & retail | 2014 |
| ProMik Oy | Construction | 2015 |
| Programmes KK & Co | Arts & recreation | 1992 |
| Psymona Oy | Health & social care | 2021 |
| Pukinetalo Vuoritaival, avoin yhtiö | Wholesale & retail | 1962 |
| Pullantai Ky | Manufacturing | 2024 |
| Pumpulitiikeri Oy | Wholesale & retail | 1999 |
| Putkihitsaus Pekka Saarinen Oy | Manufacturing | 2007 |
| Puutarhakatu 7 Oy | Real estate | 2015 |
| Puutarhapalvelu Piha & Puisto Avoin yhtiö | Administrative & support | 2009 |
| R-Jelppi Oy | Professional & scientific | 2020 |
| R. Jokinen Oy | Transport & logistics | 2008 |
| RAWEND Productions Oy | Professional & scientific | 2018 |
| RK9 AI Oy | Information & communication | 2026 |
| RMC-Metalli Oy | Manufacturing | 2014 |
| RMT-Urakointi Virtaranta Oy | Construction | 2022 |
| RS Maalaus ja Tapetointi Oy | Construction | 2010 |
| RS-Rakenne Oy | Construction | 2021 |
| Raami Nordic Steel Oy | Manufacturing | 1993 |
| Radik rakennus Oy | Construction | 2020 |
| Radla Oy | Professional & scientific | 1995 |
| Rakennus 10 Oy | Construction | 2013 |
| Rakennus E.Ahonen Oy | Professional & scientific | 2025 |
| Rakennus Kauppinen Oy | Construction | 1994 |
| Rakennus Leikkilä Ky | Construction | 2012 |