| HC Works Limited | Administrative & support | 2024 |
| Heating Solutions Alba Ltd | Construction | 2025 |
| Helen's Short Term Lettings Ltd | Real estate | 2022 |
| Herd Hydraulic and Mechanical Services Ltd | Information & communication | 2018 |
| Hessett Ltd. | Financial services | 2003 |
| High Quality Systems Ltd | Information & communication | 2020 |
| High Rise Services Ltd | Construction | 2024 |
| Highfield Global Resources Ltd | Mining & quarrying | 2011 |
| Hillside Hotel (Montrose) Limited | Hospitality | 2006 |
| Hindstones Goal Ltd | Transport & logistics | 2021 |
| Home in Ltd | Construction | 2006 |
| Homesly the George Hotel Ltd | Hospitality | 2025 |
| Homesly the Station Hotel Ltd | Hospitality | 2024 |
| Homesly the Woodman Inn Ltd | Hospitality | 2024 |
| Horne Heating and Plumbing Services Ltd | Construction | 2018 |
| HOUS10 Media Ltd | Information & communication | 2020 |
| House Builders (Montrose) Limited | Real estate | 1950 |
| House Hive Property Aftercare Ltd | Construction | 2023 |
| HSE Safety Ltd | Professional & scientific | 2025 |
| Hygea Plus Limited | Administrative & support | 2005 |
| I & S Catering Ltd | Hospitality | 2016 |
| IAN Craik Limited | Construction | 2003 |
| IAN J Robb Mechanical Ltd | Mining & quarrying | 2008 |
| ICS Intermodal Container Surveyors Ltd | Transport & logistics | 2014 |
| IJ Tech Services Limited | Information & communication | 2025 |
| IK Retails Ltd | Wholesale & retail | 2021 |
| Impact Fitness (Carnoustie) Limited | Arts & recreation | 2022 |
| Impact Fitness (Montrose) Limited | Arts & recreation | 2017 |
| Impact Fitness (Stonehaven) Ltd | Arts & recreation | 2022 |
| Independent Drilling Engineering Associates Ltd. | Professional & scientific | 1999 |
| Infrastaq.Io Ltd | Information & communication | 2021 |
| Inglis Property Holdings Ltd | Hospitality | 2023 |
| Intelligent Home Systems Ltd | Construction | 2002 |
| Intervention Group Employee Trustee Limited | Professional & scientific | 2024 |
| Irvine Rothnie Ltd | Mining & quarrying | 2015 |
| IS Consultants Ltd | Professional & scientific | 2026 |
| Isfc Ltd | Professional & scientific | 2017 |
| IST Renewables Ltd | Construction | 2024 |
| Istanbul Kebab House 34 Ltd | Hospitality | 2026 |
| Ivar Holdings Ltd | Real estate | 2021 |
| Iwcf Operations Limited | Mining & quarrying | 2017 |
| Iwell Work Limited | Professional & scientific | 2011 |
| J & L Training Solutions Limited | Mining & quarrying | 2013 |
| J & M Mccallum Limited | Real estate | 2014 |
| J & M Wind Ltd | Administrative & support | 2012 |
| J & S Wood Properties Ltd | Hospitality | 2022 |
| J Freeburn Engineering Ltd | Professional & scientific | 2023 |
| J S Eeles Groundworks Ltd | Construction | 2023 |
| J Scoular Limited | Professional & scientific | 2008 |
| J.M. Roofing and Building Ltd | Construction | 2025 |
| JA Tiger Ltd | Hospitality | 2023 |
| Jaag Interventions Limited | Mining & quarrying | 2022 |
| Jachma Limited | Professional & scientific | 2015 |
| Jack UP Consultancy Services Ltd | Mining & quarrying | 2024 |
| James Barclay Butcher Limited | Wholesale & retail | 2013 |
| James Cooper Associates Ltd | Professional & scientific | 2024 |
| James Hendry Slickline Services Ltd | Mining & quarrying | 2011 |
| James Milne Plumbing and Heating Services Ltd | Construction | 2003 |
| James Morrison Ltd. | Wholesale & retail | 2000 |
| Janick Properties Ltd | Construction | 2025 |
| Jason Boyd (Montrose) Limited | Arts & recreation | 2005 |
| Jason Boyd Professional Golf Limited | Arts & recreation | 2017 |
| Jastlo 'C' Ltd | Agriculture & fishing | 2003 |
| JAX Mixed Martial Arts Ltd. | Arts & recreation | 2015 |
| JBF Contracts Ltd | Agriculture & fishing | 2013 |
| JCC 1977 Services Ltd | Mining & quarrying | 2025 |
| JCS Property Developers Ltd | Real estate | 2020 |
| JCS Property Maintenance Ltd | Construction | 2023 |
| JD Roofing Repairs Ltd | Construction | 2024 |
| JDL Services Limited | Professional & scientific | 2007 |
| Jdmdrone-Services Ltd | Professional & scientific | 2025 |
| JDT Services Ltd | Mining & quarrying | 2016 |
| JDV Subsea Ltd | Mining & quarrying | 2016 |
| Jenny Garnham Consultants Ltd | Professional & scientific | 2002 |
| Jessica Boyd Sustainability Consultancy Ltd | Professional & scientific | 2025 |
| Jhbb Services Ltd | Real estate | 2009 |
| JLJ Consultants Ltd | Mining & quarrying | 2016 |
| JM Drilling Ltd | Mining & quarrying | 2007 |
| JNS Joinery Ltd | Construction | 2014 |
| Jodalu Limited | Hospitality | 2018 |
| John Carmichael & SON Ltd | Construction | 2014 |
| John D Crawford (Trustees) Ltd | Professional & scientific | 2025 |
| John Lawrie Tubulars Limited | Wholesale & retail | 2018 |
| JOJ Design Solutions Limited | Professional & scientific | 2020 |
| Jortay Design Limited | Professional & scientific | 2020 |
| Joss Production Services Ltd | Mining & quarrying | 2017 |
| JPE Well Engineering Ltd | Mining & quarrying | 2013 |
| JRW Plumbing & Heating Services Ltd | Construction | 2018 |
| JSF Wind Energy Limited | Energy | 2013 |
| Just Tyres Angus Limited | Wholesale & retail | 2019 |
| JVE Well Services Ltd | Mining & quarrying | 2011 |
| K Cowley Holdings Ltd | Real estate | 2025 |
| K D K Well Services Limited | Mining & quarrying | 2008 |
| K T Technical Montrose Limited | Professional & scientific | 2012 |
| K-Tec Wind Ltd | Energy | 2025 |
| Kaizen CLO Ltd | Wholesale & retail | 2026 |
| Kaizen Development Group Limited | Real estate | 2025 |
| Kaizen Fitness Group Ltd | Arts & recreation | 2024 |
| Karner Consulting Ltd | Professional & scientific | 2020 |
| Katie Barker Photography Ltd | Professional & scientific | 2023 |