| Herts Joinery Limited | Construction | 2010 |
| HEX Fireworks Limited | Wholesale & retail | 2020 |
| Hide and Teak Limited | Wholesale & retail | 2022 |
| Hing Hearingcare (Shefford) Limited | Health & social care | 2023 |
| Hingson Holdings Limited | Financial services | 2015 |
| Hitchen Group Ltd | Wholesale & retail | 2024 |
| Hitchin Plumbing Supplies Limited | Wholesale & retail | 2009 |
| I AM Real Limited | Information & communication | 2023 |
| IAN Harris Morris Spares Ltd | Wholesale & retail | 2011 |
| IAN Rice Ltd | Health & social care | 2022 |
| Idelta Consulting Limited | Information & communication | 2007 |
| Illuminart Limited | Wholesale & retail | 2018 |
| IN House HR Ltd | Administrative & support | 2025 |
| Industrial Gardening Services Limited | Administrative & support | 1998 |
| Industrial Spark Ltd | Professional & scientific | 2023 |
| Innovative Hotels Ltd | Extraterritorial | 2014 |
| ISD Property Solutions Ltd | Administrative & support | 2026 |
| Ivel Trading Limited | | 2010 |
| IVY Air Conditioning Ltd | Energy | 2025 |
| J & B Electrical Limited | Construction | 2006 |
| J Adams Construction and Development Ltd | Construction | 2023 |
| J B Obrien Limited | Information & communication | 2020 |
| J C Catering Services Ltd | Hospitality | 2019 |
| J Nason Consultancy Ltd | Professional & scientific | 2022 |
| J Parrish and SON (Holdings) Limited | Financial services | 2020 |
| J Parrish and SON Limited | Agriculture & fishing | 2014 |
| J Works Fitness Limited | Arts & recreation | 2020 |
| J&B Contracting Ltd | Construction | 2023 |
| J'S Dust Cloth Divas Limited | Other services | 2019 |
| J.Carr Developments Limited | Construction | 2022 |
| Jagh Group Limited | Hospitality | 2025 |
| Jamelah Permanent Cosmetics Ltd | Other services | 2019 |
| James Bonfield Carpentry & Construction Ltd | Manufacturing | 2022 |
| Jamie Barber the Happy Plumber Limited | Construction | 2022 |
| Jamie Challinor Ltd | Manufacturing | 2022 |
| Japha Consulting Limited | Professional & scientific | 2004 |
| JDC Deal Sourcer Ltd | Real estate | 2019 |
| JEF Investments Ltd | Other services | 2014 |
| Jessop Electro-Mechanical Services Limited | Manufacturing | 2001 |
| Jigsaw MPS Ltd | Real estate | 2005 |
| JM Brimmer Limited | Administrative & support | 2014 |
| Jmccarthyphotography Ltd | Professional & scientific | 2026 |
| JMD Commercial Property Ltd | Real estate | 2018 |
| JMJ Property Management Ltd | Real estate | 2023 |
| John Cooper Farming Ltd | Agriculture & fishing | 2025 |
| JP Automotive Bedford Ltd | Wholesale & retail | 2024 |
| JRH Building and Carpentry Ltd | Administrative & support | 2016 |
| JST Home Improvements Limited | Construction | 2018 |
| JWP Carpentry Limited | Manufacturing | 2025 |
| Jzaconstruction Ltd | Construction | 2025 |
| K2PN Consulting Limited | Professional & scientific | 2015 |
| K9 Delivery Limited | Wholesale & retail | 2016 |
| Kacey Property Ltd | Real estate | 2025 |
| Kaka Motors Ltd | Wholesale & retail | 2023 |
| KB Art Ltd | Arts & recreation | 2015 |
| KC Visuals Ltd | Information & communication | 2023 |
| Kchr Accountancy Services Limited | Professional & scientific | 2022 |
| KD Imaging Limited | Health & social care | 2025 |
| Key Cartography Ltd | Extraterritorial | 2023 |
| Killer Concepts Ltd | Wholesale & retail | 2026 |
| Kings Fire Ltd | Wholesale & retail | 2018 |
| Kiss of INK Limited | Other services | 2025 |
| KJ Kowalewski Limited | Transport & logistics | 2014 |
| KM Catering Limited | Administrative & support | 2016 |
| KRH Healthcare Limited | Health & social care | 2025 |
| L a and R Groupings Limited | Administrative & support | 2014 |
| Lakes Homes Ltd | Construction | 2018 |
| LAM Scenic Limited | Information & communication | 2012 |
| Lami Group Limited | Construction | 2019 |
| Lavender Lobster Limited | Wholesale & retail | 2024 |
| Lawton Property Services Limited | Construction | 2017 |
| Lenktec Services Limited | Construction | 2012 |
| Letchworth Fitness Ltd | Arts & recreation | 2014 |
| LGM Finance Limited | Financial services | 2022 |
| Life of Lashes Ltd | Other services | 2019 |
| Lineadrain Ltd | Professional & scientific | 2001 |
| Lloyd Amiss Group Limited | Manufacturing | 2024 |
| Lodgeway Countrywear Ltd | Wholesale & retail | 2022 |
| Logbok Ltd | Wholesale & retail | 2016 |
| Longfield Leasing Limited | Financial services | 2007 |
| Lottering & Co Ltd | Administrative & support | 2025 |
| Lotus Portfolio Ltd | Real estate | 2025 |
| LS Transport Consultants Ltd | Professional & scientific | 2024 |
| Lucra Digital Ltd | Information & communication | 2025 |
| Lunex Technology Limited | Manufacturing | 2012 |
| LX Analytics Limited | Information & communication | 2025 |
| M Creative Limited | Professional & scientific | 2008 |
| M Shotubo Consulting Ltd | Health & social care | 2022 |
| M2K Group Ltd | Transport & logistics | 2020 |
| MAD About Neon Ltd | Manufacturing | 2021 |
| Maiakai Limited | Real estate | 2024 |
| Manair Limited | Hospitality | 2025 |
| Marcus Gough Consulting Limited | Transport & logistics | 2024 |
| Marston Car Accident Repairs Limited | Wholesale & retail | 2002 |
| Mason's Interiors Limited | Construction | 2007 |
| Mastering Golf Ltd | Arts & recreation | 2026 |
| Mastronik Installations Limited | Construction | 2009 |
| Mastronik Systems Limited | Manufacturing | 2000 |
| Mastronik Systems Trustees Limited | Professional & scientific | 2023 |
| MCN Commercial Property Limited | Real estate | 2026 |