| Horizon Proteins Limited | Professional & scientific | 2014 |
| Horizon Research LP | | 2014 |
| Horizon Roofing Lothians Ltd | Construction | 2025 |
| Horizon Scotland (GP) Limited | Financial services | 2018 |
| Horizon Secure Residential Leasing L.P. | | 2015 |
| Horizon SLP | | 2007 |
| Horizonally Ltd | Administrative & support | 2021 |
| HORIZONMARKETING1 Ltd | Professional & scientific | 2025 |
| Horizons Residential Care Limited | Health & social care | 2013 |
| Horizons Residential Childcare UK Limited | Health & social care | 2024 |
| Hormet Brig Ltd | Wholesale & retail | 2024 |
| Hormiga Consulting Ltd | Professional & scientific | 2014 |
| Horn & Craton LP | | 2016 |
| Horn & Hoof Tech LP | | 2014 |
| Hornig's Taxis Ltd. | Professional & scientific | 2000 |
| Hors Capital LP | | 2015 |
| Hors Shipping LP | | 2016 |
| Horsechoice Ltd | Agriculture & fishing | 2025 |
| Horsefilm Limited | Information & communication | 2018 |
| Horshamy Alliance LP | | 2019 |
| Hortenstone LP | | 2021 |
| Hortobagy Limited | Hospitality | 2015 |
| Horton Trading House LP | | 2012 |
| Hosco Ltd | Real estate | 2026 |
| Hose International Limited | Mining & quarrying | 2017 |
| Hosedown Securities Limited | Professional & scientific | 1988 |
| Hosel Ltd | Wholesale & retail | 2025 |
| Hosheng Limited | Real estate | 2021 |
| Hosick Industries Limited | Professional & scientific | 2017 |
| Hoskins SLP | | 1997 |
| Hospitality Asset Management Ltd | Hospitality | 2014 |
| Hospitality MI Ltd | Hospitality | 2023 |
| Hospitality Ventures U.K. Ltd | Hospitality | 2011 |
| Host N Stay Ltd | Hospitality | 2026 |
| Host Special Limited Partner, L.P. | | 2015 |
| Host-Ed Ltd. | Real estate | 2015 |
| Host-Ed Plus Ltd | Professional & scientific | 2022 |
| Hostbiz LP | | 2015 |
| Hosting ROO (UK) Ltd | Information & communication | 2025 |
| Hostwell Management Limited | Hospitality | 2026 |
| Hot & Bothy Ltd | Other services | 2025 |
| Hot Builders Ltd | Construction | 2021 |
| Hot Mama Bagels Ltd | Hospitality | 2023 |
| Hot Mess Productions Scotland CIC | Arts & recreation | 2025 |
| Hot TIN Roof Public Relations Limited | Professional & scientific | 2007 |
| Hot Yoga Edinburgh Limited | Arts & recreation | 2014 |
| Hotcross Ltd | Information & communication | 2016 |
| Hotel Around Town Limited | Real estate | 2017 |
| Hotel Benchmark Limited | Information & communication | 2019 |
| Hotel F&B Ltd | Hospitality | 2026 |
| Hotel Laundry and Linen Ltd | Administrative & support | 2024 |
| Hotel Management Consultants Ltd | Professional & scientific | 2019 |
| Hotel Property Fund (Syndicate 1) Limited | Hospitality | 2003 |
| Hotel Property Fund (Syndicate 10) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 2) Limited | Hospitality | 2005 |
| Hotel Property Fund (Syndicate 3) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 4) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 5) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 6) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 7) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 8) Limited | Extraterritorial | 2009 |
| Hotel Property Fund (Syndicate 9) Limited | Extraterritorial | 2009 |
| Hotel Tech Hospitality Ltd | Information & communication | 2026 |
| Hoth Creative Limited | Arts & recreation | 2023 |
| Hothouse Brands Limited | Administrative & support | 2012 |
| Hotomated Limited | Wholesale & retail | 2025 |
| Hotresco International LP | | 2015 |
| Hotshots Tennis Academy Limited | Education | 2021 |
| Hotstop Ltd | Other services | 2024 |
| HOU Brothers Building Company Limited | Construction | 2025 |
| Houminta LLP | | 2008 |
| Hound Around Day Care Limited | Agriculture & fishing | 2019 |
| Houndstooth Partnership | | 2000 |
| House Cleaning Edinburgh Ltd | Households | 2016 |
| House Clearance Scotland Ltd | Transport & logistics | 2019 |
| House CPR Ltd | Construction | 2026 |
| House Edge Consulting Ltd. | Professional & scientific | 2019 |
| House Edge Investments Ltd | Financial services | 2024 |
| House of Bali Ltd | Wholesale & retail | 2019 |
| House of Bumble Limited | Professional & scientific | 2023 |
| House of Danu Limited | Hospitality | 2023 |
| House of Dolly Ltd | Real estate | 2024 |
| House of Goldfinch Limited | Wholesale & retail | 2025 |
| House of Hearing Ltd | Health & social care | 1970 |
| House of Henderson Property Ltd | Households | 2026 |
| House of Hose Limited | Administrative & support | 2011 |
| House of Illusions Limited | Extraterritorial | 2023 |
| House of Kilt Making Ltd | Manufacturing | 2022 |
| House of Mandala Ltd | Wholesale & retail | 2026 |
| House of Nails Edinburgh Ltd | Other services | 2026 |
| House of Patience Limited | Wholesale & retail | 2026 |
| House of Raine Ltd | Professional & scientific | 2026 |
| House of Righetti Limited | Professional & scientific | 2017 |
| House of Running Dogs Ltd | Wholesale & retail | 2022 |
| House of Shaw Holdings Limited | Financial services | 2026 |
| House of Siam Limited | Hospitality | 2009 |
| House of Sleigh Limited | Arts & recreation | 2023 |
| House of Stirling (Direct Mail) Limited | Professional & scientific | 1973 |
| House of Stylar Ltd | Professional & scientific | 2024 |
| House Offices Limited | Real estate | 2026 |