| Sweet Fabs Group Ltd | Financial services | 2023 |
| Sweet on Games Limited | Wholesale & retail | 2012 |
| Sweet Serendipity Ltd | Hospitality | 2018 |
| Sweetgum Topco Limited | Financial services | 2026 |
| SY Holdings Ltd | Financial services | 2020 |
| Sykes Composites Ltd | Professional & scientific | 2024 |
| Synergyvocals. | Arts & recreation | 2000 |
| System Change Solutions Ltd | Professional & scientific | 2022 |
| System Design Evaluation Limited | Professional & scientific | 1986 |
| T & L Project Solutions Limited | Real estate | 2015 |
| T L Brooks Limited | Wholesale & retail | 2009 |
| T.J.A. Surveying Services Limited | Construction | 1998 |
| T.Nel Real Estate Limited | Real estate | 2025 |
| T7 Properties Ltd | Households | 2005 |
| Tackle on Line Limited | Wholesale & retail | 1999 |
| Tadpole Bagheera Limited | Real estate | 2015 |
| Tamel Limited | Professional & scientific | 2008 |
| Tanks Pumps & Equipment Limited | Construction | 1998 |
| Tarka Russell Limited | Wholesale & retail | 2022 |
| TASK360 Consultancy Services Limited | Information & communication | 2008 |
| Tavira Home Limited | Real estate | 2024 |
| Taxspecialefx (Peterlee) LLP | | 2003 |
| Taxspecialefx LLP | | 2010 |
| Taylor Clark Cars Ltd | Wholesale & retail | 2020 |
| Taylor Kirkham Electrical Limited | Construction | 2005 |
| TDW Holdings Ltd | Financial services | 2018 |
| Teaky Blinders Ltd | Wholesale & retail | 2026 |
| Teamde Limited | Extraterritorial | 2021 |
| Tech-Insights Ltd | Professional & scientific | 2025 |
| Technical Direct (UK) Limited | Information & communication | 2002 |
| Techserve Limited | Construction | 2026 |
| TED Alpine Bakehouse Ltd | Hospitality | 2026 |
| Television Sound Limited | Information & communication | 2010 |
| TEN Hands Bakehouse Cafe (Daventry) Ltd | Manufacturing | 2024 |
| TEN Hands Cafe Bars Limited | Hospitality | 2016 |
| Terraform Metals Ltd | Professional & scientific | 2025 |
| Tesori Velati Limited | Wholesale & retail | 2025 |
| Teve Ltd | Real estate | 2023 |
| Texture Sofas and Interiors Limited | Wholesale & retail | 2007 |
| TG2 Consultants Ltd | Professional & scientific | 2021 |
| Tgcc Limited | Administrative & support | 2019 |
| Tgtp Ltd | Arts & recreation | 2023 |
| TH Silverstone Residents Limited | Households | 2024 |
| THE 20-GHOST Club Limited | Other services | 2004 |
| THE Armoury Coaching Studio Ltd | Arts & recreation | 2018 |
| THE Artea Room Limited | Hospitality | 2024 |
| THE B Bond Company Ltd | Extraterritorial | 2018 |
| THE Bachman Group Ltd | Hospitality | 2016 |
| THE Banbury Private Physiotherapy Practice Limited | Other services | 2010 |
| THE Bigwig Company UK Limited | Other services | 2003 |
| THE Bookings Hub Ltd | Information & communication | 2024 |
| THE Brdc Limited | Extraterritorial | 1983 |
| THE Cleaning Lady Towcester Ltd | Administrative & support | 2022 |
| THE Club Pilates V Ltd | Other services | 2025 |
| THE Coach (Marlow) Ltd | Hospitality | 2014 |
| THE Collings Group Ltd | Information & communication | 2021 |
| THE Comfy Horse Company Limited | Wholesale & retail | 2025 |
| THE Creative Edit Ltd | Other services | 2021 |
| THE Curated Casting Company Ltd | Other services | 2016 |
| THE Cutting Room Towcester Limited | Real estate | 2020 |
| THE Event MAN Ltd | Hospitality | 2025 |
| THE Experiences Group Limited | Arts & recreation | 2018 |
| THE Expert Blemish Clinic Limited | Health & social care | 2025 |
| THE Expert Skin Clinic Limited | Health & social care | 2023 |
| THE Funeral Market Limited | Other services | 2017 |
| THE Gangas RES Ltd | Hospitality | 2023 |
| THE Gardening Girls Limited | Administrative & support | 2016 |
| THE George at Tiffield Ltd | Hospitality | 2020 |
| THE Golf Gym Limited | Extraterritorial | 2006 |
| THE Good Bowl Ltd | Hospitality | 2026 |
| THE Good Cellar Limited | Wholesale & retail | 2023 |
| THE Grazing Affaire Ltd | Hospitality | 2026 |
| THE Great British Inns Group Ltd | Hospitality | 2018 |
| THE Greenacres Family Limited | Health & social care | 2025 |
| THE Griffin Restaurant Ltd | Hospitality | 2016 |
| THE Happy Days Group Limited | Arts & recreation | 2018 |
| THE Hawksmoor Learning Trust | Education | 2011 |
| THE Hiring Science Studio Ltd | Professional & scientific | 2026 |
| THE India Edit Limited | Information & communication | 2020 |
| THE Insights Distillery Limited | Professional & scientific | 2015 |
| THE Intolerant Gourmand Limited | Hospitality | 2014 |
| THE Jewellery Collection LLP | | 2003 |
| THE Last Hurdle Limited | Professional & scientific | 2013 |
| THE Leaflet Company MK Limited | Administrative & support | 2019 |
| THE Leaflet Delivery Company Limited | Administrative & support | 2019 |
| THE Little Jobs Company Limited | Construction | 2018 |
| THE Local Barbers (Towcester) Ltd | Other services | 2026 |
| THE Millustrator Ltd | Professional & scientific | 2026 |
| THE Modern Lawn Company Limited | Wholesale & retail | 2017 |
| THE Mottley Grip Company Ltd | Information & communication | 2019 |
| THE Muxlow Group Ltd | Wholesale & retail | 2024 |
| THE Old Brickyard Landscape Buffer Ltd | Households | 2022 |
| THE Old Brickyard Ltd | Households | 2022 |
| THE Old County Arms (2015) Limited | Real estate | 2015 |
| THE Old Mail CIC | Information & communication | 2015 |
| THE Old School House (Towcester) Management Co. Limited | Households | 1988 |
| THE Olive Grove Kardamyli Limited | Hospitality | 2026 |
| THE Outside in Design Company Limited | Wholesale & retail | 2003 |
| THE Paddocks Management Company (Paulerspury) Limited | Households | 2012 |
| THE Pawfectionist Limited | Other services | 2022 |