| Hierarchy Properties Ltd | Real estate | 2024 |
| Hierarchy Technologies Ltd | Information & communication | 2024 |
| High Efficiency Gas&Heating Services Ltd | Construction | 2024 |
| High Five Food Group Limited | Wholesale & retail | 2023 |
| High Visibility Limited | Wholesale & retail | 2005 |
| Highbury Healthcare (Holdings) Limited | Health & social care | 2003 |
| Highbury Healthcare Limited | Health & social care | 2003 |
| Highland Parfume Limited | Manufacturing | 2024 |
| Highlander (Scotland) Limited | Wholesale & retail | 1995 |
| Highlander (Scotland) Properties Limited | Real estate | 2014 |
| Highlander USA Ltd | Wholesale & retail | 2021 |
| Hilltop Capital Ltd | Real estate | 2020 |
| Hilltoprise Global Limited | Manufacturing | 2025 |
| Hing Shing Ltd | Real estate | 2024 |
| Historic Stone Ltd | Manufacturing | 2025 |
| HJB Freelancing Ltd | Transport & logistics | 2019 |
| HK Global Apparel Limited | Wholesale & retail | 2026 |
| HKZ Services Ltd | Real estate | 2008 |
| HL Construction Services Ltd | Administrative & support | 2024 |
| Hogarth Motor Company Limited | Administrative & support | 2015 |
| Holyrood Care (Edinburgh) Ltd | Health & social care | 2016 |
| Home-Start West Lothian | Other services | 2005 |
| Homebite Technology Limited | Hospitality | 2026 |
| Homelea Joinery Ltd | Construction | 2026 |
| Homesbycomfynests Ltd | Real estate | 2024 |
| Homeveda Ltd | Wholesale & retail | 2024 |
| Honey House Cafe Ltd | Hospitality | 2025 |
| Hongmao Livingston Ltd | Hospitality | 2025 |
| Hoorain’S Noor Ltd | Administrative & support | 2025 |
| Hopetoun Property Ltd | Real estate | 2023 |
| Horizontal 23 Limited | Construction | 2023 |
| Horrizon Trading Ltd | Households | 2025 |
| Horstad Ltd | Construction | 2018 |
| HOSPITALITY24 Limited | Construction | 2020 |
| Hosspa Fuel Ltd | Wholesale & retail | 2025 |
| Hot Dawgs Ltd | Wholesale & retail | 2021 |
| Hot Since 99 Ltd | Other services | 2023 |
| House of Maise Limited | Wholesale & retail | 2024 |
| House of Seline Ltd | Manufacturing | 2025 |
| HOUSE4KIDS Limited | Education | 2007 |
| Houstoun Productions Limited | Information & communication | 2016 |
| HS Lothian Ltd | Construction | 2019 |
| HSL Falkirk Ltd | Real estate | 2018 |
| HSL International Limited | Administrative & support | 2020 |
| HSL Kirkintilloch Ltd | Real estate | 2017 |
| HSL Perth Ltd | Real estate | 2018 |
| HTS Agfo Limited | | 1992 |
| Hughes Style Ltd | Wholesale & retail | 2021 |
| Humind Ltd | Information & communication | 2026 |
| Hustle Gym Life Ltd | Arts & recreation | 2018 |
| Hvacscot Ltd | Manufacturing | 2024 |
| HW Entertainment Ltd | Arts & recreation | 2024 |
| HW Valet & Detailing Ltd | Administrative & support | 2024 |
| Hyaltech Ltd. | Manufacturing | 2001 |
| Hyccs Tech Ltd | Professional & scientific | 2022 |
| Hydra-Tronic Services | | 1992 |
| Hydro Kleen Services Limited | Administrative & support | 2014 |
| I&D Edinburgh Ltd | Hospitality | 2025 |
| I&M Edinburgh Ltd | Hospitality | 2023 |
| I.M.A. Taxi Co. Ltd. | Professional & scientific | 1998 |
| Iain Fraser Joinery Ltd | Construction | 2021 |
| IB Network Ltd | Wholesale & retail | 2026 |
| Icestar.Scot Ltd | Manufacturing | 2021 |
| ICF Scotland Limited | Wholesale & retail | 2014 |
| ICF Store Ltd | Wholesale & retail | 2016 |
| Icon Industries Limited | Manufacturing | 1998 |
| Iconia Limited | Professional & scientific | 2018 |
| IDE Consulting Ltd | Administrative & support | 2015 |
| IE Trading Limited | Wholesale & retail | 2025 |
| IFP Scotland Ltd | Construction | 2020 |
| ILF Scotland | Health & social care | 2015 |
| Ilhame Naseri Ltd | Administrative & support | 2019 |
| Imet Alloys (Europe) Limited | Water & waste | 2015 |
| Imet Alloys Group Limited | Professional & scientific | 2011 |
| Imet Alloys Limited | Water & waste | 2016 |
| Imet Processing (Europe) Limited | Water & waste | 2017 |
| Imet Tech Ltd | Professional & scientific | 2021 |
| Impact Coaching Academy Ltd | Education | 2026 |
| Impact Laboratories Limited | Professional & scientific | 2002 |
| Improvement Service Company | Professional & scientific | 2005 |
| Independent Bookkeeping Ltd | Professional & scientific | 2018 |
| Independent Marine Ltd | Transport & logistics | 2022 |
| Independent Social Work Scotland Ltd | Health & social care | 2025 |
| Independent Space Solutions Ltd | Real estate | 2025 |
| Indigo E-Commerce Digital Limited | Wholesale & retail | 2018 |
| Industrial Floor Prep Scotland Limited | Construction | 2016 |
| Industrial Moving Services Ltd | Manufacturing | 2025 |
| Industrial Resin Systems Ltd | Construction | 2021 |
| Industrial Safety Supplies Limited | Wholesale & retail | 2019 |
| Infinity Edinburgh Limited | Real estate | 1999 |
| Informed Events Ltd | Information & communication | 2017 |
| Infovision IT Solutions Ltd | Information & communication | 2019 |
| Inmedio Company Ltd | Transport & logistics | 2021 |
| Innovate (Cowdenbeath) Limited | Administrative & support | 2007 |
| Insight Psychology and Consultancy Ltd | Health & social care | 2018 |
| Inspection NDT Services Ltd | Professional & scientific | 2018 |
| Instep Podiatry Uphall Ltd | Health & social care | 2018 |
| Institute of Asian Professionals | Other services | 2007 |
| Insulated Concrete Formwork Services Ltd | Other services | 2022 |
| Intelliconai UK Ltd | Information & communication | 2026 |