| Presis Kjøreteknikk AS | Education | 2022 |
| Pva AS | Manufacturing | 2024 |
| Red & White Invest AS | Wholesale & retail | 1999 |
| Rentable AS | Administrative & support | 2019 |
| Resth AS | Professional & scientific | 2022 |
| Rinen AS | Other services | 2015 |
| RL Bygg AS | Hospitality | 2013 |
| Røed & Bull Invest AS | Real estate | 2005 |
| Røine Ranch AS | Agriculture & fishing | 2024 |
| Rønningen AS | Other services | 2016 |
| Rønningen Gård & Event AS | Real estate | 2026 |
| Safety Consult AS | Professional & scientific | 1997 |
| Sepp Ansgar AS | | 2023 |
| SGM Data AS | Information & communication | 2013 |
| Simen Heslien AS | Construction | 2025 |
| Sjåstadveien Holding AS | Financial services | 2016 |
| Skjeggerud Installasjon AS | Administrative & support | 2016 |
| Skjæret 2 AS | Real estate | 2021 |
| Smaksriket AS | Agriculture & fishing | 2017 |
| Soelna Holding AS | | 2026 |
| Steinar Hagen Transport & Maskin AS | Transport & logistics | 2012 |
| Stolheisgutta Da | Other services | 2022 |
| Studio 10 Arkitekter AS | Professional & scientific | 2025 |
| Sylling Auto Service Da | Other services | 2008 |
| Sylling Boligutvikling AS | Real estate | 2025 |
| Sylling Brygge AS | Arts & recreation | 2012 |
| Sylling Eiendom AS | Real estate | 2014 |
| Sylling Fus Barnehage AS | Education | 2008 |
| Sylling Helsesenter Da | Health & social care | 2021 |
| Sylling Holding AS | | 2025 |
| Sylling Multiservice AS | Manufacturing | 1994 |
| Sylling Senter AS | Real estate | 2025 |
| Sylling Sentrum Holding AS | Real estate | 2014 |
| Sylling Vestre AS | Real estate | 2017 |
| Syllingtoppen Invest AS | Financial services | 2005 |
| Team Tolisen Da | Wholesale & retail | 2011 |
| TJ Bygg Og Maskin AS | Construction | 2026 |
| Tom Vidar Hansen Skogsdrift AS | Agriculture & fishing | 2019 |
| TRG Management AS | Professional & scientific | 2014 |
| Trygg Lek Da | Construction | 1994 |
| Tømrer Jørgen Sveaas AS | Construction | 2025 |
| Valstad Gård Aktiv AS | Education | 1997 |
| Vangen Mat Drift AS | Wholesale & retail | 2014 |
| VANNTEC1 AS | Construction | 2022 |
| Ve Og Vel AS | Education | 2014 |
| Vekstbyggeren AS | Professional & scientific | 2017 |
| Viken Gjenvinning AS | Water & waste | 2020 |
| Villa Boligstyling AS | Professional & scientific | 2014 |
| Wip Holding AS | | 2025 |
| Xilhouette AS | Real estate | 2005 |
| Xpert Portservice AS | Construction | 2026 |
| Xrent AS | Administrative & support | 2021 |
| Økonomiservice Holding AS | Financial services | 2014 |
| Østre Enger Gård AS | Agriculture & fishing | 2023 |
| Østre Sylling Grunneierlag SA | Arts & recreation | 1946 |