| SB Harper Jones Ltd | Professional & scientific | 2010 |
| Schools and Universities Polo Limited | Administrative & support | 2005 |
| Sekhmet Technologies Ltd | Information & communication | 2026 |
| Seraph Refurbishments Ltd | Construction | 2020 |
| Slow Train Limited | Arts & recreation | 2018 |
| Small Claims Advisor Limited | Professional & scientific | 2017 |
| Smart-Azz Ltd | Construction | 2015 |
| Sonic Architecture UK Ltd | Professional & scientific | 2024 |
| Spinfield Investments (Stoke Hammond) Ltd | Construction | 2016 |
| ST Clair Accountancy Solutions Ltd | Professional & scientific | 2018 |
| Stress Planet Limited | Wholesale & retail | 2008 |
| SZC Consulting Limited | Administrative & support | 2017 |
| Tahoe International Limited | Wholesale & retail | 1987 |
| Tax Support Limited | Professional & scientific | 2025 |
| Tenerife Holiday Homes Limited | Hospitality | 2007 |
| THE Bridge Property Company Limited | Real estate | 1997 |
| THE Cross Trust | Administrative & support | 2008 |
| THE Folde Limited | Administrative & support | 2025 |
| THE Old Amersham General Stores Ltd | Manufacturing | 2023 |
| THE Old Coach House Consulting Ltd | Information & communication | 2022 |
| THE Saracen's Head Inn Limited | Hospitality | 2010 |
| THE Transition Group Limited | Professional & scientific | 2008 |
| Tiverton Consultancy Limited | Professional & scientific | 2019 |
| Tom's Trading Ltd | Wholesale & retail | 2025 |
| Tonic Limited | Professional & scientific | 2005 |
| Valid Computing Limited | Professional & scientific | 1986 |
| Veganation Ltd | Wholesale & retail | 2022 |
| W H B Electrical Limited | Construction | 2003 |
| WE Buy Houses Limited | Professional & scientific | 2002 |
| Willcock (Butchers) Limited | Wholesale & retail | 1977 |
| Willjolu Ltd | Information & communication | 2013 |
| Zareen Consulting Limited | Professional & scientific | 2010 |