| House and Homestyle Limited | Extraterritorial | 1935 |
| HOY Mckay Associates Limited | Professional & scientific | 2003 |
| HR Locksmiths & Property Maintenance Limited | Professional & scientific | 2011 |
| Huish Holdings Limited | Real estate | 2024 |
| Hummingbirds Nursery...Learning to FLY Ltd | Education | 2018 |
| Hurley Hall Enterprises Limited | Real estate | 1986 |
| Hurley Healthcare LLP | | 2010 |
| Hurley Kings Football Club Limited | Arts & recreation | 2015 |
| Hyperion Facilities Ltd | Construction | 2023 |
| IAN Rothen Limited | Administrative & support | 2012 |
| IBT Engineering Ltd | Professional & scientific | 2025 |
| Iconic Motorsport Services Limited | Wholesale & retail | 2021 |
| Idbutt Consulting Ltd | Energy | 2005 |
| Iftimovici Ltd | Transport & logistics | 2015 |
| Ilex Envirosciences Limited | Agriculture & fishing | 2003 |
| In-Cert Solutions (UK) LLP | | 2020 |
| Incorporated Property Services Ltd | Construction | 2022 |
| Inglefield Finance Limited | Financial services | 1992 |
| Interflame Heating Limited | Construction | 2018 |
| Ipub Group Atherstone Limited | Wholesale & retail | 2019 |
| Iqbal Kitchen Limited | Hospitality | 2021 |
| J & H Fisher Limited | Agriculture & fishing | 2008 |
| J & J GAS & Electrical Services Limited | Other services | 2018 |
| J & M Gill Estates Limited | Real estate | 2014 |
| J & M Resins Ltd | Construction | 2021 |
| J Barber Transport Ltd | Transport & logistics | 2014 |
| J D Management (Warwickshire) Ltd | Real estate | 2013 |
| J M Plant Services Limited | Construction | 2005 |
| J&D Tyres Ltd | Extraterritorial | 2025 |
| J-5ECURITY Ltd | Construction | 2014 |
| J5IVE Limited | Construction | 2020 |
| Jackpot Holdings Limited | Information & communication | 2024 |
| JAM JAR Property Limited | Real estate | 2018 |
| James LEE Electrical Solutions Ltd | Construction | 2021 |
| Java Art Limited | Wholesale & retail | 2015 |
| Jbc.Improvements Ltd | Construction | 2024 |
| Jbc.Kitchens & Bathrooms Ltd | Professional & scientific | 2026 |
| JC Consultancy Services Limited | Health & social care | 2023 |
| JC Panel Solutions Ltd | Manufacturing | 2020 |
| JD Luxe Landscaping Limited | Professional & scientific | 2026 |
| Jenkins Investments Limited | Financial services | 2021 |
| Jenner Holdings Limited | Financial services | 2001 |
| Jeremy Corbett & Associates Ltd | Professional & scientific | 2011 |
| Jetpack Squirrel Ltd. | Information & communication | 2014 |
| JLG 1509 Ltd | Transport & logistics | 2017 |
| JLP Property Investments Limited | Real estate | 2017 |
| JOB Financial Services Limited | Professional & scientific | 2009 |
| JS Resources Ltd | Wholesale & retail | 2026 |
| JTS Finishings Ltd | Construction | 2024 |
| Jubilee Cross (Austrey) Management Company Limited | Households | 2017 |
| Juice Hair Ltd | Other services | 2025 |
| Just Hoses Limited | Manufacturing | 2012 |
| K & M Leisure Ltd | Arts & recreation | 2025 |
| K & M Property Holdings Ltd | Real estate | 2025 |
| K C Personnel Limited | Transport & logistics | 2014 |
| K&G’S Tata’S Limited | Hospitality | 2026 |
| K.W.R. Water Treatment Limited | Water & waste | 2012 |
| KAS Kazini Limited | Public administration | 2022 |
| Kayuan Harry Limited | Wholesale & retail | 2025 |
| KB Analysis Ltd | Professional & scientific | 2017 |
| KDR Leisure Ltd | Construction | 2024 |
| Keferdiz Limited | Other services | 2019 |
| Kensington Collection Limited | Real estate | 2013 |
| Keogh Estates Limited | Real estate | 2017 |
| Keya Limited | Wholesale & retail | 2026 |
| Keya News Limited | Wholesale & retail | 2018 |
| KLM Surfacing and Groundworks Ltd | Construction | 2023 |
| KMJ Engineering Management Services Limited | Professional & scientific | 2016 |
| Knights of Arley Limited | Manufacturing | 2020 |
| Knockout Consultancy Ltd | Wholesale & retail | 2017 |
| Knot and Bayonet Ltd | Construction | 2023 |
| KRS Air-Conditioning Limited | Construction | 2002 |
| L S Carter Atherstone Limited | Real estate | 2022 |
| Land Rights Capital Limited | Financial services | 2026 |
| Laughs and Lullabies Ltd | Education | 2025 |
| Laura Frank Consulting Ltd | Health & social care | 2016 |
| Lawson-Gill Limited | Information & communication | 2023 |
| Lean Pillars Ltd | Professional & scientific | 2024 |
| LEE Atkins Limited | Wholesale & retail | 2014 |
| Leisureteq Ltd | Wholesale & retail | 2015 |
| Lesley J Jones Ltd | Health & social care | 2019 |
| Lettings & Sales Limited | Real estate | 2010 |
| LFS Surfacing Limited | Construction | 2025 |
| LH Ecommerce Ltd | Wholesale & retail | 2023 |
| Lifeisartvisuals Ltd. | Information & communication | 2014 |
| Lighthouse Property Limited | Construction | 1995 |
| Lightning Hospitality Ltd | Hospitality | 2025 |
| Lily of the Valley Florists Limited | Wholesale & retail | 2016 |
| Linkit & Co Ltd | Other services | 2013 |
| Liquidation Stocks Ltd | Wholesale & retail | 2021 |
| Lisa IT Solutions Ltd | Information & communication | 2015 |
| Lisa’S Sweet Treats Ltd | Wholesale & retail | 2021 |
| Litly Ltd | Wholesale & retail | 2025 |
| Little Rogues Club Ltd | Wholesale & retail | 2021 |
| Lj's Cosmetics Ltd | Wholesale & retail | 2026 |
| Lj's Nuneaton Ltd | Wholesale & retail | 2022 |
| LJA Services (Midlands) Ltd | Wholesale & retail | 2018 |
| Llangadfan Limited | Administrative & support | 1997 |
| Lloyd Pascal & Co.Limited | Wholesale & retail | 1941 |
| LNO Distribution Ltd | Wholesale & retail | 2025 |