| THE Maintenance Firm Limited | Construction | 2021 |
| THE Marlow Cheese Co Ltd | Manufacturing | 2019 |
| THE Marlow Language Centre Limited | Administrative & support | 1989 |
| THE Marlow Partnership Limited | Construction | 2018 |
| THE Mature Medic Platform C.I.C. | Extraterritorial | 2020 |
| THE Mews (Marlow) Management Co Ltd | Households | 2016 |
| THE Mind + Body Hub Limited | Other services | 2025 |
| THE Mixing JUG Limited | Hospitality | 2014 |
| THE Multiple Hosts' Ball Limited | Other services | 1991 |
| THE Narrative Agency Limited | Arts & recreation | 2003 |
| THE Ogden Group Limited | Construction | 2019 |
| THE Old Exchange Property Co. Ltd | Households | 2017 |
| THE Old Nursery (Bourne END) Ltd | Real estate | 2022 |
| THE Oppo Foundation | Other services | 2014 |
| THE Pawfection Parlour Ltd | Other services | 2022 |
| THE Peach Marlow Ltd | Other services | 2022 |
| THE People Foundry Limited | Administrative & support | 2012 |
| THE Piano Teachers' Course UK Ltd | Arts & recreation | 2018 |
| THE Pink Gym Ltd | Arts & recreation | 2025 |
| THE Potentialists Limited | Professional & scientific | 2021 |
| THE Printing Boutique Ltd | Manufacturing | 2010 |
| THE Puppini Sisters Limited | Arts & recreation | 2018 |
| THE Ralph Propco Limited | Real estate | 2026 |
| THE Ralph Veterinary Referral Centre PLC | Professional & scientific | 2015 |
| THE Really Fine Leisure Company Ltd | Arts & recreation | 2002 |
| THE Repair Finder C.I.C. | Wholesale & retail | 2022 |
| THE Rocking Horse Partnership Ltd | Professional & scientific | 2013 |
| THE Rose Club Marlow CIC | Hospitality | 2025 |
| THE Secretariat of the Local Medical Committees for Berkshire Buckinghamshire and Oxfordshire | Other services | 1993 |
| THE Sefton-Minns Partnership LLP | | 2019 |
| THE Ship Limited | Hospitality | 1999 |
| THE Shires (Egham) Management Company Limited | Households | 2010 |
| THE Sign HUT Limited | Manufacturing | 2016 |
| THE Signage LAB Limited | Professional & scientific | 2025 |
| THE Slumit Company Ltd | Wholesale & retail | 2010 |
| THE Smiling Bear Ltd | Information & communication | 2014 |
| THE Space Vault Exhibition Limited | Administrative & support | 2024 |
| THE Stays Intl. Ltd | Real estate | 2026 |
| THE Strategy Room Limited | Extraterritorial | 2003 |
| THE Sycamores Mill Road Freehold & Management Company Limited | Households | 2017 |
| THE Termes Partnership LLP | | 2002 |
| THE Thames Club Limited | Administrative & support | 2008 |
| THE Vanilla POD (Marlow) Ltd | Hospitality | 2015 |
| THE Walled Garden (Ascot) Ltd | Real estate | 2022 |
| THE Wethered Estate Limited | Households | 1995 |
| THE White Hart Inn (Hamstead Marshall) Limited | Construction | 2011 |
| THE Woof Works Ltd | Other services | 2015 |
| THE Workhorse Consultancy Limited | Real estate | 2005 |
| THE World Reimagined Limited | Health & social care | 2020 |
| Theatreland Ltd | Wholesale & retail | 2009 |
| Thelikeminded Group Limited | Financial services | 2025 |
| Thelikeminded Limited | Information & communication | 2012 |
| Thermo Limited | Construction | 2018 |
| THG Trading Limited | Wholesale & retail | 2023 |
| Think IT Digital Ltd | Information & communication | 2018 |
| Thirty Cubed Property Ltd | Real estate | 2019 |
| This for That Ltd | Health & social care | 2021 |
| This IS ME Health Ltd | Extraterritorial | 2020 |
| Thomas Anthony Property Consultants Ltd | Construction | 1998 |
| Thomas Chaytor Solicitors Limited | Professional & scientific | 2014 |
| Thomas International Holdings Limited | Information & communication | 2016 |
| Thomas International Limited | Professional & scientific | 1981 |
| Thomas International UK Limited | Professional & scientific | 1990 |
| Thrive Adhd Coach Ltd | Education | 2024 |
| Thrive Worldwide Ltd | Health & social care | 2017 |
| Ticco Foods Limited | Wholesale & retail | 1994 |
| Tice Limited | Other services | 2009 |
| Tierney Court Limited | Households | 1980 |
| Tigerlily Lettings Limited | Real estate | 2003 |
| Timson Building Services Ltd | Construction | 2023 |
| TIN Media Ltd | Information & communication | 2016 |
| TIN Media Properties 1 Ltd | Construction | 2021 |
| TIN Media Properties Ltd | Financial services | 2020 |
| TIN Town Limited | Hospitality | 2020 |
| Tipping Management Company Limited | Households | 1993 |
| Titan Eagle Limited | Information & communication | 2026 |
| Titmuss Estates (Beechurst) Limited | Real estate | 2020 |
| Titmuss Estates Limited | Construction | 2016 |
| TKM Properties Ltd | Professional & scientific | 2018 |
| TLM Capital Limited | Real estate | 2025 |
| TLP (Developments) Ltd | Construction | 2019 |
| TLP Groundworks Ltd | Construction | 2022 |
| Tobal Ltd | Professional & scientific | 2019 |
| Tobin & Gravestock Limited | | 1952 |
| Todays Accounts Limited | Professional & scientific | 2011 |
| TOM Jones (Boat Builders) Limited | Real estate | 1961 |
| TOM Russell Design Ltd | Professional & scientific | 2009 |
| Tomnie Services Ltd | Administrative & support | 2017 |
| Tony Lawrence VFX Ltd | Information & communication | 2020 |
| Top Bunk Thinking Ltd | Administrative & support | 2010 |
| Top Team Developments Ltd | Real estate | 2016 |
| Topina Ltd | Professional & scientific | 2012 |
| Total Cognition Ltd | Professional & scientific | 2026 |
| Totalex Ltd | Professional & scientific | 2021 |
| Totumcom Limited | Information & communication | 2023 |
| Touch the Moon Enterprises Ltd | Wholesale & retail | 2024 |
| TOURS-2.COM Ltd | Administrative & support | 2023 |
| TPT (UK) Limited | Administrative & support | 2000 |
| TPT Properties Ltd | Real estate | 2021 |
| Tracktech Sports UK Ltd | Arts & recreation | 2023 |