| Scaling Nature Oy | Putkilahti | 2023 |
| Scan Cranes Oy | Akaa | 2012 |
| Scan Entry Oy | Hyvinkää | 1990 |
| ScanBrothers Oy | Helsinki | 2023 |
| ScanLab Oy | Oulu | 2015 |
| Scanalfa Ky | Helsinki | 2004 |
| Scanasian Projects Oy | Espoo | 1994 |
| Scancalac Oy | Rauma | 1988 |
| Scancenter Oy | Tampere | 1978 |
| Scancerco Oy | Vantaa | 1985 |
| Scandenergy Contracting Ab | Mariehamn | 1989 |
| Scandesco Energy Tech Oy | Nurmijärvi | 2016 |
| Scandi Life Group Oy | Helsinki | 2018 |
| Scandi Process Design Services Oy | Osoite Tuntematon | 2015 |
| ScandiCorp Oy | Helsinki | 2015 |
| Scandia Fellows Oy | Nurmijärvi | 1998 |
| ScandiaSec Avoin yhtiö | Helsinki | 2006 |
| Scandiacus Oy | Yli-Olhava | 2018 |
| Scandic Advisory Group II Oy | Tampere | 2025 |
| Scandic Career Oy | Vantaa | 2024 |
| Scandic Quartz Oy | Imatra | 2019 |
| Scandicform Oy | Vantaa | 2010 |
| Scandinaval Group Oy | Helsinki | 2012 |
| Scandinavia Star Oy | Espoo | 2005 |
| Scandinavian & Baltic Hotel Consulting Oy | Espoo | 2023 |
| Scandinavian Arctic Investment Oy | Rovaniemi | 2025 |
| Scandinavian Colloids Oy | Tampere | 1996 |
| Scandinavian Electric Vehicles Research and Manufacturing Oy | Turku | 2025 |
| Scandinavian Financial Research Oy | Osoite Tuntematon | 1991 |
| Scandinavian Innovation Group Oy | Espoo | 2011 |
| Scandinavian Institute for Academic Mobility Oy | Seinäjoki | 2014 |
| Scandinavian Law & Property Ab | Öja | 2007 |
| Scandinavian Management System Auditing Oy | Klaukkala | 2020 |
| Scandinavian Media Consulting Avoin Yhtiö | Vaasa | 1996 |
| Scandinavian Press House Oy | Helsinki | 1998 |
| Scandinavian Sales Oy | Helsinki | 2012 |
| Scandinavian Scholastic Center Ltd Oy | Hämeenlinna | 2022 |
| Scandinavian Success Oy | Espoo | 2019 |
| Scandinavian Trust CMS Oy | Helsinki | 2016 |
| Scandinavian Turnaround Partners Oy | Helsinki | 2012 |
| Scandinavian Wind Energy SWE Oy | Muonio | 2010 |
| Scandion Oy | Helsinki | 2002 |
| Scandiservice Oy | Rauma | 2019 |
| Scanditext Oy | Helsinki | 1998 |
| Scandix käännökset Oy översättningar Ab | Turku | 1992 |
| Scandukraine Oy | Riihimäki | 1993 |
| Scanelit Oy | Helsinki | 2004 |
| Scaneuropa Sa Oy | Kirkkonummi | 1993 |
| Scanlevel Oy | Tampere | 2007 |
| Scanmedex Engineering Ltd Oy | Kylmälä | 1995 |
| Scanmobi Oy | Helsinki | 1994 |
| Scannano Oy | Turku | 2025 |
| Scannoplan Oy | Turku | 1997 |
| Scanritor Oy | Azets | 2001 |
| Scanvik Oy | Helsinki | 1997 |
| Scanwood Oy | Helsinki | 2009 |
| Scarlett Ventures Ab | Karperö | 2020 |
| Scemo Oy | Tampere | 2008 |
| Scenairio Oy | Helsinki | 2026 |
| Scenarum Oy | Espoo | 1980 |
| Scener Oy | Helsinki | 2016 |
| Sceneve Oy | Osoite Tuntematon | 2019 |
| Schauman & Co. Oy Ltd. | Helsinki | 2022 |
| Schauman & Nordgren Architects Ab | Helsinki | 2015 |
| Schauman Securities Oy | Helsinki | 2026 |
| Schaumans Redovisning Ab | Mariehamn | 2020 |
| Schedio Oy | Helsinki | 2019 |
| Schibsted SMB Oy | Helsinki | 2022 |
| Schiestl Ventures Oy | Turku | 2019 |
| Schmid capital Oy | Osoite Tuntematon | 2022 |
| Schmidt Communications Oy | Tampere | 2017 |
| Schmidt Investment Oy | Tampere | 2020 |
| Schnell Consulting Oy | Vantaa | 2014 |
| School of Doers Oy | Espoo | 2024 |
| Schoolday Designer Oy | Espoo | 2018 |
| Schreiner Consulting Oy | Tampere | 2019 |
| Schulman & Sons Oy | Espoo | 2025 |
| Schybergson Consulting Ab | Helsinki | 2023 |
| Schönberg Consulting Oy | Helsinki | 2025 |
| Schüco Finland Oy | Turku | 2014 |
| Science Piction Oy | Espoo | 2021 |
| Science and Technology Forum Oy | Tampere | 2013 |
| Science4growth Oy | Espoo | 2015 |
| ScienceSoft Oy | Vantaa | 2009 |
| Scila AB Filial i Finland | Mariehamn | 2026 |
| Scionriver Holding Oy | Jyväskylä | 2024 |
| Scire Consulting Oy | Osoite Tuntematon | 2022 |
| Sciret Oy | Helsinki | 1996 |
| Scirocco Oy | Naantali | 1987 |
| Sciscitor Oy | Helsinki | 2021 |
| Scitech-Service Oy | Helsinki | 1983 |
| Scius Oy | Karjalohja | 2020 |
| Scollini Partners Oy | Helsinki | 2019 |
| Scons Oy | Espoo | 1990 |
| Scope Design Oy | Helsinki | 2018 |
| Scope Impact Oy | Helsinki | 2008 |
| Scope Research Oy | Espoo | 2021 |
| Scopetech Oy | Vantaa | 2017 |
| Score Consulting Oy | Tampere | 2007 |
| Scorizons Oy | Espoo | 2024 |