| AH2 Investments Limited | Real estate | 2023 |
| AHA Barber 2 Limited | Other services | 2025 |
| Ahad ALI 7786 Limited | Wholesale & retail | 2025 |
| AHD Enterprises Ltd | Wholesale & retail | 2025 |
| Ahead SCM Limited | Mining & quarrying | 2011 |
| Ahisi Limited | Transport & logistics | 2026 |
| AHM United Ltd | Real estate | 2025 |
| AHS Property Ltd | Real estate | 2024 |
| Ahz-Group Limited | Hospitality | 2024 |
| AI Cloud Craft Ltd | Information & communication | 2025 |
| Aiar Inspection Limited | Professional & scientific | 2025 |
| Aicompli Ltd | Information & communication | 2026 |
| Aida Group Ltd | Transport & logistics | 2020 |
| Aiimoil Ltd. | Professional & scientific | 2019 |
| AIK2A Sustainable Energy (Holdings) Ltd | Energy | 2023 |
| AIK2A Sustainable Energy Ltd | Energy | 2014 |
| Aiken Elston Limited | Professional & scientific | 2013 |
| Aimre Consulting Limited | Professional & scientific | 2012 |
| Aipa Ltd | Professional & scientific | 2025 |
| Air & Renewable Resources Limited | Energy | 2014 |
| Air Clean Caledonia Limited | Administrative & support | 2025 |
| Air Control Entech Limited | Manufacturing | 2016 |
| Air Kopter Engineering Limited | Professional & scientific | 2022 |
| Air-Tech Engineering Ltd | Construction | 2021 |
| Aircon Scotland Limited | Construction | 2013 |
| Airdic Global Payroll Solutions Limited | Professional & scientific | 2025 |
| Airies Holdco Limited | Financial services | 2015 |
| Airies Topco Limited | Financial services | 2015 |
| Airies Windfarm Limited | Energy | 2011 |
| Airyhall Commercial Services Limited | Professional & scientific | 2016 |
| AIS Subs Group Ltd | Real estate | 2024 |
| Aisus Offshore Limited | Administrative & support | 2012 |
| Aitken Assets Ltd | Real estate | 2023 |
| Aixel Ltd | Information & communication | 2024 |
| AJ Autocare Limited | Wholesale & retail | 2022 |
| AJ Fast Foods Ltd | Hospitality | 2022 |
| AJ Igbinovia Global Resource Limited | Transport & logistics | 2025 |
| AJ Planning Services Limited | Professional & scientific | 2019 |
| AJ Plant and Tool Hire Ltd | Administrative & support | 2025 |
| AJ Protrade Services Ltd | Wholesale & retail | 2026 |
| AJ Smith Limited | Real estate | 2023 |
| AJ Subsea Ltd | Wholesale & retail | 2025 |
| AJ Well Services Ltd | Mining & quarrying | 2010 |
| Aj&Co Limited | Professional & scientific | 2012 |
| Aj's Pizza and Pasta Ltd | Hospitality | 2015 |
| Ajasue Services Ltd | Health & social care | 2019 |
| AJC Construction Scotland Limited | Construction | 2001 |
| AJC Joinery Workshops Limited | Manufacturing | 2021 |
| AJL Consulting Agents Ltd | Health & social care | 2021 |
| AJL Subsea Ltd | Professional & scientific | 2019 |
| AJM Inspection Services Ltd | Mining & quarrying | 2017 |
| AJM Joinery Limited | Construction | 2013 |
| AJM RA Inspection Ltd | Professional & scientific | 2025 |
| Ajmcg Ltd | Professional & scientific | 2021 |
| AJT Engineering Limited | Manufacturing | 1948 |
| AJT Equity Ltd | Construction | 2025 |
| AJT Logistics Ltd | Transport & logistics | 2025 |
| Ajwa Market Ltd | Wholesale & retail | 2024 |
| AK Architecture Solutions Limited | Professional & scientific | 2017 |
| AK Bloonz Ltd | Other services | 2025 |
| AK Crew Limited | Other services | 2025 |
| AK Subsea Services Ltd. | Other services | 2023 |
| AK Taxi Aberdeen Ltd | Transport & logistics | 2023 |
| AK5LECTRICAL Ltd | Manufacturing | 2022 |
| AKA Innovations Power & Electrical Engineering Ltd | Construction | 2019 |
| AKA Property Lets Limited | Real estate | 2023 |
| Akaddtech Limited | Professional & scientific | 2009 |
| Akal Property Holdings Ltd | Real estate | 2026 |
| AKB Tax Limited | Professional & scientific | 2022 |
| AKBABA21 Ltd | Wholesale & retail | 2021 |
| Akella Inter LP | | 2013 |
| Aker Offshore Wind Limited | Energy | 2021 |
| AKG Retail Ltd | Wholesale & retail | 2016 |
| Akil Retail Ltd | Wholesale & retail | 2024 |
| Akinu Systems Ltd | Information & communication | 2025 |
| AKJ Planning Limited | Professional & scientific | 2016 |
| AKN Logistics Ltd | Transport & logistics | 2023 |
| AKR Fitness Ltd | Other services | 2012 |
| Akrotex Inter LP | | 2014 |
| AKS Welding Services Ltd | Administrative & support | 2018 |
| Aktrad Limited | Professional & scientific | 2001 |
| Akuma Services Ltd | Other services | 2025 |
| AKV2 Ltd | Wholesale & retail | 2024 |
| AKV27 Ltd | Wholesale & retail | 2019 |
| AKW Software Services Limited | Information & communication | 2018 |
| AKZ Scott Properties Ltd | Real estate | 2026 |
| AL Birweh Ltd | Real estate | 2018 |
| AL Global 4 Phones Limited | Information & communication | 2002 |
| AL Madina Catering Ltd | Hospitality | 2018 |
| AL Qudra Drilling Company Limited | Mining & quarrying | 2017 |
| AL Subsea Engineering Ltd | Professional & scientific | 2011 |
| AL Zeina 2014 Limited | Financial services | 2014 |
| Al-Aqyal Ltd | Hospitality | 2025 |
| Al-Baari Ltd | Hospitality | 2018 |
| Al-Hassan Partners Services Ltd | Other services | 2025 |
| AL2 Ltd | Hospitality | 2024 |
| Alamad Limited | Professional & scientific | 2011 |
| Alamdar Consultants Limited | Professional & scientific | 2021 |
| Alan Bisset Completions Limited | Professional & scientific | 2008 |
| Alan Clark Slating Ltd | Construction | 2023 |