| THE Kindred Lullaby Company Ltd | Information & communication | 2025 |
| THE Laser and Aesthetics Company Limited | Other services | 2021 |
| THE Lehan Company Ltd | Other services | 2018 |
| THE Lewis Luxe Ltd | Other services | 2022 |
| THE Listener Productions Ltd | Information & communication | 2025 |
| THE Lodge (Packhorse Road) Management Company Limited | Households | 2006 |
| THE London Function Band Entertainment Ltd | Arts & recreation | 2019 |
| THE LTM Partnership Ltd | Education | 2013 |
| THE Magdi Yacoub Support Office Limited | Other services | 2016 |
| THE Magic of Christmas Limited | Wholesale & retail | 2022 |
| THE Maples Maintenance Company (Hitchin) Limited | Households | 1973 |
| THE Market Channel Limited | Wholesale & retail | 2019 |
| THE Mead Residents (Hitchin) Limited | Other services | 2013 |
| THE Meads Management Co. Ltd. | Households | 1998 |
| THE Media Insomnia Limited | Other services | 2016 |
| THE Message Works Consulting Ltd | Professional & scientific | 2025 |
| THE Mindset Coach Ltd | Professional & scientific | 2025 |
| THE Mixed Martial Arts Room Limited | Other services | 2020 |
| THE Muster Point CIC | Health & social care | 2025 |
| THE Natural Building Company Ltd | Administrative & support | 2007 |
| THE Nutricode Limited | Health & social care | 2023 |
| THE O'S Production Limited | Information & communication | 2015 |
| THE Obee Hairdressing Company Ltd | Wholesale & retail | 2009 |
| THE Ombuds Group | Other services | 2022 |
| THE Orbital Centre Stevenage Management Company Limited | Households | 2005 |
| THE Oval (Stevenage) Community Association | Other services | 2011 |
| THE Oval (Stevenage) Enterprises Ltd. | Hospitality | 1997 |
| THE Paddocks (Goffs Oak) Management Company Limited | Households | 2002 |
| THE Perfect Pizza Herts Ltd | Hospitality | 2025 |
| THE Personal Touch Collective Limited | Manufacturing | 2025 |
| THE Place International Limited | Other services | 2022 |
| THE Plantation (Stevenage) Management Company Limited | Households | 2006 |
| THE Plastics Group Ltd | Wholesale & retail | 2018 |
| THE Plaza Cardiff Bay (Phase 1) Management Company Limited | Households | 2000 |
| THE Poké Store Limited | Wholesale & retail | 2025 |
| THE Practical Secretary Limited | Administrative & support | 2019 |
| THE Practice Roomz Academy Ltd | Education | 2026 |
| THE Pretty Parcel Company Ltd | Wholesale & retail | 2015 |
| THE Property Refurb Co Herts Limited | Construction | 2025 |
| THE Property Refurb Co London Limited | Real estate | 2015 |
| THE RAD Universal Group Co Ltd | Wholesale & retail | 2023 |
| THE Rail Trolley Trust | Arts & recreation | 2014 |
| THE Recruiter Academy Limited | Administrative & support | 2017 |
| THE Removals Industry Ombudsman Scheme | Transport & logistics | 2001 |
| THE RYE Management Limited | Households | 2003 |
| THE S.F. Experience Limited | Arts & recreation | 2013 |
| THE Sailing Centre Ltd | Administrative & support | 2013 |
| THE Sales Masters Guild Ltd | Professional & scientific | 2015 |
| THE Sarp Smiths Limited | Health & social care | 2021 |
| THE School Grounds Company Limited | Education | 2004 |
| THE Shephall and Broadwater Social Club C.I.C. | Hospitality | 2020 |
| THE Signature Garden Lifestyle Company Ltd | Wholesale & retail | 2025 |
| THE Sitdownuk Ltd | Administrative & support | 2020 |
| THE Socials Box Limited | Professional & scientific | 2026 |
| THE Soft Side Limited | Professional & scientific | 2025 |
| THE SOL Plan Limited | Manufacturing | 2017 |
| THE Stevenage Arts Society Ltd | Other services | 2005 |
| THE Stevenage Community Trust | Health & social care | 1990 |
| THE Stevenage Tattoo Company Limited | Professional & scientific | 2019 |
| THE Tech Empire Ltd | Information & communication | 2017 |
| THE Tiling Co Hertfordshire Ltd | Construction | 2021 |
| THE Training Wing Limited | Arts & recreation | 2020 |
| THE Transport Buyer Ltd | Wholesale & retail | 2021 |
| THE Ultimate Agency of Inevitable Fortune (Proud Prods) Limited | Arts & recreation | 1991 |
| THE Very Caring Company Limited | Health & social care | 2015 |
| THE Video Standards Council Limited | Extraterritorial | 2009 |
| THE VMS Automotive Group Limited | Professional & scientific | 2021 |
| THE Watercolour World | Public administration | 2016 |
| THE Wellbeing Junction CIC | Education | 2023 |
| THE White Lion (Walkern) Ltd | Hospitality | 2025 |
| THE Wild West PUB Company Limited | Hospitality | 2010 |
| THE Willows (Hemel Hempstead) Residents Company Limited | Households | 1996 |
| THE Wood Veneer Hub Limited | Extraterritorial | 2023 |
| THE WOW Awards Limited | Professional & scientific | 1997 |
| THE WOW Group Limited | Professional & scientific | 1997 |
| THE Wright Glow Ltd | Professional & scientific | 2024 |
| THE Youth Play Ltd | Information & communication | 2024 |
| Thegutco Limited | Other services | 2019 |
| Theitmedic Limited | Information & communication | 2021 |
| Therapy Guide Ltd | Administrative & support | 2012 |
| There and Back Transport and Logistics Ltd | Administrative & support | 2025 |
| Thesinglesco Ltd | Arts & recreation | 2019 |
| Think Property Management Limited | Real estate | 2020 |
| Thinkpath Limited | Information & communication | 2010 |
| Third Broom Barns Management Company Limited | Households | 1978 |
| Thistle & Bristles Ltd | Construction | 2025 |
| Thomas & SON Plumbing & Heating Ltd | Construction | 2024 |
| Thomas Decorating Ltd | Construction | 2013 |
| Thomas Gould House Management Limited | Households | 2005 |
| Thompsons Meadow (GM) Management Company Limited | Real estate | 2022 |
| Thor Topco Limited | Financial services | 2016 |
| Thorley Plumbing Limited | Other services | 2020 |
| Thornbury Real Estate Limited | Professional & scientific | 2022 |
| Thorogood Media Services Limited | Professional & scientific | 2015 |
| Three B Automotive Ltd | Wholesale & retail | 2024 |
| Three Dimes Consulting Ltd | Professional & scientific | 2021 |
| Three Joys Property Limited | Real estate | 2021 |
| Three Little Angels Ltd | Health & social care | 2021 |
| Three Pillars Investments Ltd | Real estate | 2019 |
| Three SSS Ltd | Transport & logistics | 2026 |