| H Hair Studios Limited | Other services | 2025 |
| Half Full Productions Ltd | Other services | 2014 |
| Hammonds Wood Limited | Real estate | 2021 |
| Hampstead Heath Estates 2 Limited | Real estate | 2022 |
| Handy Allen Limited | Construction | 2010 |
| Harlequin Forge & Stud Limited | Professional & scientific | 2012 |
| Harris Roofing & Guttering Limited | Construction | 2024 |
| Hawkeye VFX Limited | Information & communication | 2022 |
| Heathrow Property Company Limited | Real estate | 2015 |
| Heathrow Solutions Limited | Wholesale & retail | 2017 |
| Heathrow Trade Sales Ltd | Wholesale & retail | 2014 |
| Heathstone Ltd | Professional & scientific | 2013 |
| Henchards Limited | Professional & scientific | 2003 |
| Henderson Property Management (Surrey) Limited | Real estate | 2019 |
| Hendry's Beach Limited | Other services | 2015 |
| Hester Alexander Limited | Administrative & support | 2021 |
| Highway 27 Productions Limited | Information & communication | 2023 |
| Hire Direct Limited | Administrative & support | 2022 |
| HKC Management Consulting Limited | Administrative & support | 2008 |
| HLS Construction Limited | Construction | 2025 |
| Hocrest Ltd | Public administration | 2019 |
| Hollow Crown Limited | Information & communication | 2018 |
| Honeypot Shops Limited | | 1968 |
| Horse & Groom (Chobham) Ltd | Hospitality | 2020 |
| Hound Promotions Limited | Professional & scientific | 2008 |
| HOW Lane Farm Estate Limited | Financial services | 2011 |
| Hspace Ltd | Wholesale & retail | 2018 |
| Hughes SQ Limited | Professional & scientific | 2022 |
| Hyland Fitzwater Limited | Professional & scientific | 2010 |
| IAN Oswin Limited | Professional & scientific | 2007 |
| Ibos Tech Limited | Information & communication | 2019 |
| Ikigai Life Limited | Professional & scientific | 2023 |
| Imagika Sculpting Studios Limited | Manufacturing | 2000 |
| Imol Ltd | Real estate | 2021 |
| Imol Study Ltd | Real estate | 2020 |
| Infinite Roof Care Limited | Construction | 2024 |
| Infinity Effects Limited | Information & communication | 2012 |
| Information Tower Solutions (UK) Limited | Other services | 2015 |
| Innovaguest Ltd | Professional & scientific | 2025 |
| Integrated Body Dynamics Ltd | Education | 2007 |
| Integrated Technology Solutions Ltd | Information & communication | 2004 |
| International Buying Office Solutions Limited | Administrative & support | 2018 |
| International Marine Holdings Limited | Professional & scientific | 1962 |
| Intewatt UK Limited | Wholesale & retail | 2013 |
| ISH2 Limited | Information & communication | 2017 |
| Itsl Audio Visual Ltd | Information & communication | 2010 |
| J London Builders Limited | Construction | 2022 |
| J W Bookkeeping Ltd | Extraterritorial | 2021 |
| J. L. Ward Consulting Services Limited | Information & communication | 2020 |
| J.D.B Design & Build Ltd | Construction | 2021 |
| Janiak Property Ltd | Real estate | 2024 |
| Jansz Recruitment Solutions Limited | Administrative & support | 2017 |
| Jaye Holdings Ltd | Real estate | 2019 |
| JB Enterprises (Sunningdale) Limited | Other services | 2020 |
| Jermmolm Ltd | Financial services | 2020 |
| JG Surfacing Limited | Administrative & support | 2025 |
| JJR Films Limited | Information & communication | 2019 |
| Jjvfx Limited | Information & communication | 2019 |
| JO Folacci Executive Coaching Ltd | Administrative & support | 2017 |
| Jonny Lewis Partnership Limited | Information & communication | 2025 |
| JR Painting & Decorating Ltd | Construction | 2021 |
| JTB Construction (Surrey) Limited | Construction | 2016 |
| Juby Design Ltd | Information & communication | 2016 |
| Kairos Productions Limited | Administrative & support | 2014 |
| Kairos Supply Chain Solutions Ltd | Other services | 2019 |
| Kandy Films Limited | Information & communication | 2023 |
| Kavanagh Rodney | | 2011 |
| KE & JA Limited | Professional & scientific | 2022 |
| Keep IT Rusty Limited | Arts & recreation | 2022 |
| Kitchen Hewarts | | 2010 |
| Kittycard Ltd | Professional & scientific | 2023 |
| KLB Films Limited | Information & communication | 2023 |
| KLP Bailiff Services Limited | Other services | 2013 |
| Koval VFX Ltd | Information & communication | 2023 |
| L D Therapy Services Limited | Administrative & support | 2020 |
| LAN YAN Limited | Administrative & support | 2015 |
| Landform Consultants Ltd | Administrative & support | 2003 |
| Landform Maintenance Ltd | Administrative & support | 1999 |
| Langdale Developments Limited | Construction | 2011 |
| Lanyon & Eliot Limited | Professional & scientific | 2025 |
| Lanyon Development Limited | Construction | 2016 |
| Lanyon Group Limited | Financial services | 2023 |
| Lassoed VFX Limited | Information & communication | 2025 |
| Lavan Grips Limited | Information & communication | 2023 |
| Lawrence ORR Creative Ltd | Information & communication | 2025 |
| Laymore Asphalt Ltd. | Administrative & support | 2022 |
| LB Communications Consultancy Limited | Information & communication | 2009 |
| LC Property (Surrey) Limited | Real estate | 2025 |
| LDV Dawlish Limited | Construction | 2022 |
| LDV Longfield Limited | Construction | 2020 |
| Lefbrod Limited | Other services | 2015 |
| LG01 Limited | Construction | 2023 |
| LG02 Ltd | Financial services | 2023 |
| LG03 Limited | Health & social care | 2025 |
| LG05 Limited | Health & social care | 2025 |
| LG06 Limited | Health & social care | 2026 |
| LGC Commercial Vehicles Ltd | Wholesale & retail | 1978 |
| LHC VFX Limited | Information & communication | 2024 |
| Liana Films Limited | Information & communication | 2024 |
| Life Charms Limited | Other services | 2017 |