| Hammoon Cycles Ltd | Manufacturing | 2009 |
| Hangar 3 Old Sarum Ltd | Hospitality | 2024 |
| Happy ME CBD Ltd. | Wholesale & retail | 2022 |
| Hartgrove Estate Fencing Limited | Financial services | 2025 |
| Hartley Mumford Associates Limited | Professional & scientific | 2019 |
| Harvey Joseph Ltd. | Professional & scientific | 2016 |
| Hawes Arborists Limited | Agriculture & fishing | 1997 |
| Hawksfr Ltd | Other services | 2024 |
| Haxnicks International Ltd | Manufacturing | 2012 |
| Hazelbridge Digital Growth Ltd | Professional & scientific | 2026 |
| Hazledon Consulting Ltd | Professional & scientific | 2020 |
| Hbsi Limited | Construction | 2011 |
| Headland HR Limited | Administrative & support | 2022 |
| Headspace Coffee Ltd | Manufacturing | 2025 |
| Health Quest Europe Ltd. | Health & social care | 1985 |
| Health Quest UK Limited | Health & social care | 1999 |
| Helena Feltham Limited | Professional & scientific | 2026 |
| Herbie's Agricultural Contracting Ltd | Agriculture & fishing | 2016 |
| Hestia Hub Ltd | Hospitality | 2025 |
| HEY Moscow Limited | Manufacturing | 2001 |
| Hhlandscapes LLP | | 2020 |
| Hidden Greece Ltd. | Hospitality | 2017 |
| Hidden Pizza Ltd | Hospitality | 2015 |
| High House Court Ltd | Households | 2024 |
| Highspan Building Solutions (International) Limited | Manufacturing | 2008 |
| Hilcott Consultancy Ltd | Professional & scientific | 2018 |
| Hillarnias Ltd | Wholesale & retail | 2023 |
| Hillgate Interiors Limited | Real estate | 2000 |
| Hine Motors Limited | Real estate | 1969 |
| Hkkb Limited | Information & communication | 2004 |
| HNJ Engineering Limited | Manufacturing | 2011 |
| Hobson's Choice IT Solutions Limited | Extraterritorial | 1998 |
| Honour Jewellery Ltd | Wholesale & retail | 2012 |
| Howmarine Ltd. | Transport & logistics | 2014 |
| Hurtle Travel Limited | Information & communication | 2018 |
| Ibex Land LLP | | 2024 |
| Ibex Partners I LLP | | 2025 |
| Ice Refrigeration Services Ltd | Manufacturing | 2008 |
| Imprint Graphics Solutions Ltd | Manufacturing | 2019 |
| IN8TE Ltd | Wholesale & retail | 2024 |
| Inafix Limited | Construction | 2019 |
| Inafood Technology Ltd | Professional & scientific | 2020 |
| Innstone Group Ltd | Hospitality | 2025 |
| Inside Knowledge Limited | Administrative & support | 1999 |
| Interface (MJC) Ltd | Information & communication | 1997 |
| Intra-Team IT Consultants Limited | Information & communication | 1996 |
| Inzz Developments Ltd | Construction | 2026 |
| IS and DK Ltd | Administrative & support | 2018 |
| Isgar Developments Ltd | Construction | 2019 |
| IW Electrical Ltd | Construction | 2021 |
| J E Rattle Limited | Manufacturing | 2026 |
| J&R Jones Ltd | Professional & scientific | 2026 |
| J. Deverill Services Ltd. | Agriculture & fishing | 1994 |
| Jack and Audrey Limited | Professional & scientific | 2023 |
| Jack Wills Consultants Ltd | Information & communication | 1995 |
| James Leacock Vehicle Management Ltd | Wholesale & retail | 2024 |
| Jampa's Limited | Manufacturing | 2021 |
| Jane Reeves Limited | Health & social care | 2007 |
| JCF Eviction Services Limited | Extraterritorial | 2019 |
| Jcpd Limited | Construction | 2013 |
| Jets Haulage Ltd | Transport & logistics | 2025 |
| JF Security Ltd | Administrative & support | 2024 |
| JJ Baxter Ltd | Financial services | 2025 |
| JK Digital Consulting Limited | Information & communication | 2016 |
| JMK Building Contractors Ltd | Construction | 2026 |
| John Rose Limited | Professional & scientific | 2010 |
| JOT Carpets & Flooring Limited | Wholesale & retail | 2018 |
| JT Executive Network Ltd | Hospitality | 2025 |
| Juno Creations Limited | Professional & scientific | 2022 |
| Just Self Assessments Ltd | Professional & scientific | 2020 |
| Jwaa Training Group Ltd | Education | 2024 |
| K&Z Kurklu Ltd | Hospitality | 2025 |
| K1 Decorators Limited | Construction | 2023 |
| Kaleli Property Ltd | Real estate | 2025 |
| Karen Wadman & Associates Limited | Professional & scientific | 2013 |
| Karmacare Limited | Administrative & support | 2017 |
| Kate Selley PR Ltd | Professional & scientific | 2021 |
| Kavanagh Roofing (Holdings) Limited | Professional & scientific | 1989 |
| KAY Solutions Limited | Hospitality | 2004 |
| KEB Marketing Resources Limited | Professional & scientific | 1998 |
| Kelo Pipeline Engineering Limited | Construction | 2009 |
| Keynote Artist Management Limited | Arts & recreation | 2013 |
| Keytocollege Ltd | Education | 2016 |
| King Alfred's Property Company Limited | Construction | 1978 |
| Kingdom Crust UK Ltd | Hospitality | 2024 |
| Kirsty Heap Coaching Limited | Professional & scientific | 2025 |
| Kirwin Davies Foundation | Public administration | 2017 |
| Koho.Ai Ltd | Information & communication | 2019 |
| Kolwa Direct Limited | Wholesale & retail | 2023 |
| Koolthings Ltd | Wholesale & retail | 2025 |
| L W J Engineering Ltd | Manufacturing | 2009 |
| Ladner Ltd | Wholesale & retail | 2024 |
| Lance Show & Publications Limited | Information & communication | 2007 |
| Langlands Tree Services Limited | Agriculture & fishing | 2005 |
| Lansdown Saville ROW Limited | Other services | 2018 |
| Lawn Court (Management) Shaftesbury Company Limited | Professional & scientific | 1983 |
| Leave IT to ME Limited | Professional & scientific | 2000 |
| Legal Trustee Limited | Financial services | 1924 |
| Levers Estates Limited | Agriculture & fishing | 1997 |
| Lewis Consulting & Design Limited | Professional & scientific | 2006 |