| Harrow Mews Ltd | Real estate | 2020 |
| Harry James Creative Ltd | Professional & scientific | 2024 |
| Harvey Warrington Media Ltd | Professional & scientific | 2021 |
| Hawkes Services Ltd | Construction | 2021 |
| Head to Tail MT Ltd | Professional & scientific | 2025 |
| Helios Ventures Limited | Financial services | 2021 |
| HG Coaching Ltd | Health & social care | 2024 |
| Higgins Electrical Services Ltd | Construction | 2017 |
| Hillbury Farm Residents Company Limited | Households | 2020 |
| Hillbury Grange Management Company Ltd | Households | 2007 |
| Hillbury Heights Limited | Real estate | 2014 |
| Hindhill Limited | Households | 1981 |
| Holden & Sons Scaffolding Ltd | Construction | 2025 |
| House Martin GRP Limited | Construction | 2002 |
| Houzzclean Limited | Administrative & support | 2023 |
| HST Estates Ltd | Real estate | 2022 |
| Huntsman's Close Residents' Association Limited | Households | 1987 |
| Hurstwyn Associates Limited | Professional & scientific | 2013 |
| HY Education (Nottingham) Ltd | Education | 2024 |
| HY Education Limited | Education | 2010 |
| Hylas EOR Solutions Ltd | Administrative & support | 2023 |
| I&D Drylining Ltd | Construction | 2024 |
| IC Philanthropy Foundation | Arts & recreation | 2015 |
| Impetus Contracting Ltd | Financial services | 2021 |
| Imyra Properties Ltd | Real estate | 2017 |
| IN the Company of Horses CIC | Education | 2022 |
| IN2INFINITY Ltd | Education | 2021 |
| Innodex Limited | Real estate | 2011 |
| Innovate Plumbing and Heating Ltd | Construction | 2019 |
| Instinct Renovations Limited | Construction | 2019 |
| Intec Automotive Ltd | Wholesale & retail | 2023 |
| Inventive Drives & Patios Limited | Construction | 2025 |
| Invidia Aesthetics Ltd | Other services | 2026 |
| J.E.Y Consulting Ltd | Professional & scientific | 2024 |
| Jaar Catering Limited | Hospitality | 2026 |
| James Creasey Construction Limited | Construction | 2018 |
| JBG Consulting Ltd | Professional & scientific | 2023 |
| Jbrg Limited | Real estate | 2017 |
| JC Shopfitting Ltd | Construction | 2007 |
| Jedora Ltd | Wholesale & retail | 2021 |
| JM Technical Limited | Information & communication | 2025 |
| JM Trading Ltd | Administrative & support | 2018 |
| JMJ Plumbing Ltd | Construction | 2026 |
| John G Moody Ltd | Professional & scientific | 2021 |
| Johnson & Martin Limited | Financial services | 2026 |
| Joy Orbison Limited | Information & communication | 2010 |
| Jqbw Limited | Construction | 2021 |
| Jupa Trading Ltd | Wholesale & retail | 2020 |
| K&K Smart Tech Ltd | Construction | 2014 |
| K,S,K Group Ltd | Construction | 2019 |
| K9 Capers Caterham Limited | Other services | 2024 |
| Kagan Industries Ltd | Manufacturing | 2026 |
| Kairos Enterprises Incorporated Ltd | Education | 2012 |
| Kashfam Properties Ltd | Real estate | 2025 |
| Kazimiera Limited | Administrative & support | 2024 |
| Kerry-Anne Ltd | Hospitality | 2024 |
| Keston Smith Limited | Real estate | 2006 |
| Ketcher Heating Limited | Construction | 2013 |
| Kings of Kent Ltd | Construction | 2025 |
| KJ Consultancy Limited | Information & communication | 2018 |
| Kopka Building Services Ltd | Construction | 2023 |
| Kredas Ltd | Professional & scientific | 2020 |
| KSF Medical Services Limited | Health & social care | 2013 |
| KSR Recovery Ltd | Transport & logistics | 2025 |
| Kwality Krown Limited | Professional & scientific | 2021 |
| L S Building & Property Services Ltd | Construction | 2018 |
| Lanes Strategic Services Limited | Professional & scientific | 2011 |
| LE Thala Limited | Hospitality | 2025 |
| Leadx Group Holdings Limited | Administrative & support | 2025 |
| Lennon & Sons Transport Limited | Manufacturing | 2023 |
| Lincoln Stud Limited | Professional & scientific | 2017 |
| Linkbase Limited | Information & communication | 1988 |
| Linkedtohome Ltd | Education | 2025 |
| LLC Plumbing & Building Services Limited | Construction | 2022 |
| Llonsson Limited | Wholesale & retail | 1989 |
| Love Northcote Ltd | Administrative & support | 2021 |
| Lovely Bubbly Spas Ltd | Administrative & support | 2022 |
| LR & G Group Limited | Construction | 2026 |
| LSS Groundworks Ltd | Construction | 2023 |
| LSS LOO Hire Limited | Water & waste | 2024 |
| LSS Skip Hire & Waste Clearance Ltd | Water & waste | 2026 |
| Luxe Family Limited | Administrative & support | 2010 |
| Lvconstruction Ltd | Construction | 2021 |
| Lynch & Sons Skip Hire Ltd | Water & waste | 2018 |
| M & a Hygiene Limited | Wholesale & retail | 1988 |
| M & Y Properties Holdings Limited | Real estate | 2025 |
| M & Y Properties Limited | Real estate | 2018 |
| M.J.R.Enviromental Services Limited | Construction | 2008 |
| Maguire Financial Ltd | Information & communication | 2026 |
| Maguire Futures Limited | Professional & scientific | 2013 |
| Malfed Investments Ltd | Real estate | 2025 |
| Marston Drive Freeholders Ltd | Real estate | 2016 |
| Martin Equity Ltd | Construction | 2023 |
| Masonside Limited | Construction | 2023 |
| Mayoo Builders Ltd | Construction | 2020 |
| MDAS4 Limited | Real estate | 2025 |
| ME16 113 Limited | Extraterritorial | 2025 |
| Memiq Limited | Information & communication | 2025 |
| Mergar Limited | Financial services | 2021 |
| Merlin Executive Search Ltd | Administrative & support | 2024 |