| Ahtamar LP | | 2015 |
| Ahvilla Asset Management Ltd | Hospitality | 2020 |
| AI Creative Group Limited | Manufacturing | 2025 |
| AI Data Tools Ltd | Information & communication | 2023 |
| AI Equity LP | | 2017 |
| AI Eshopping Limited | Wholesale & retail | 2025 |
| AI Ethics Ltd | Information & communication | 2025 |
| AI Exploration Ltd | Professional & scientific | 2018 |
| AI Financial Training Ltd | Education | 2025 |
| AI GFS Carry LP | | 2020 |
| AI GFS Coinvest LP | | 2020 |
| AI GFS GP Limited | Information & communication | 2020 |
| AI Gill Ltd | Health & social care | 2025 |
| AI Insurance Solutions Limited | Financial services | 2021 |
| AI Master Access LP | | 2017 |
| AI Master GP LLP | | 2017 |
| AI Systems Solutions Ltd | Information & communication | 2020 |
| AI Techno Ltd | Information & communication | 2025 |
| AI Track Mate Ltd | Information & communication | 2025 |
| AI4HEALTH Innovations Ltd | Information & communication | 2025 |
| AIB Foresight SME Impact Founder Partner LP | | 2022 |
| AIB Foresight SME Impact General Partner LLP | | 2021 |
| AIB PFP (General Partner) Limited | Financial services | 2013 |
| AIB PFP Scottish Limited Partnership | | 2013 |
| AIB Ventures Ltd | Information & communication | 2022 |
| AICH2 Energy Limited | Wholesale & retail | 2024 |
| Aicture Ltd | Information & communication | 2026 |
| Aida Edin Limited | Hospitality | 2025 |
| Aide & Brothers Ltd. | Wholesale & retail | 2020 |
| Aido Holding LP | | 2017 |
| Aiduroos Hassan Ltd | Transport & logistics | 2026 |
| Aiforall Limited | Wholesale & retail | 2016 |
| AIG Holding LP | | 2016 |
| AIG PEP VI - a Europe GP, L.P. | | 2008 |
| AIG PEP VI - a Europe, L.P. | | 2008 |
| Aig-Fp FCT4 Limited Partnership | | 2007 |
| Aiguablava Ltd | Information & communication | 2017 |
| Aigypios LP | | 2013 |
| Aihua Holding Ltd | Financial services | 2024 |
| Aihua Limited | Wholesale & retail | 2016 |
| Aikaterini V.Tsintziloni Smile Care Ltd | Health & social care | 2025 |
| Aikengall Community Wind Company (Holdings) Limited | Professional & scientific | 2007 |
| Aikengall Community Wind Company Limited | Energy | 2006 |
| Aikengall II Community Wind Company (Holdings) Limited | Energy | 2013 |
| Aikengall II Community Wind Company Limited | Energy | 2013 |
| Aikido Technologies Ltd | Professional & scientific | 2024 |
| Aikman Bell Ltd | Professional & scientific | 2015 |
| Aikman CAB Hire Limited | Professional & scientific | 2001 |
| Aikman Messer Ltd | Wholesale & retail | 2023 |
| AIL Heating Ltd | Construction | 2024 |
| AIL Resources Limited | Construction | 2018 |
| Aila Rose Ltd | Wholesale & retail | 2022 |
| Aileen Capital Ltd | Wholesale & retail | 2025 |
| Ailie MCD Design Ltd | Manufacturing | 2023 |
| Ailier Trading LP | | 2013 |
| Ailinity Project LP | | 2015 |
| Ailinon LP | | 2016 |
| Ailsa Care Services Ltd. | Health & social care | 2004 |
| Ailsa Cook Consulting Ltd | Professional & scientific | 2025 |
| Ailsa HQ Limited | Information & communication | 2025 |
| Ailsa Ltd | Real estate | 2025 |
| Ailsa Mackie Ltd | Professional & scientific | 2016 |
| Ailsa Technology Limited | Information & communication | 2025 |
| Ailurus Ltd | Professional & scientific | 2022 |
| AIM Family Ltd | Wholesale & retail | 2026 |
| AIM Fire and Security Limited | Construction | 2016 |
| AIM4ART Ltd | Wholesale & retail | 2018 |
| Aiman Enterprises Limited | Wholesale & retail | 2024 |
| Aimeron Limited | Construction | 2016 |
| Aimes Consulting Ltd | Administrative & support | 2014 |
| Aiming for Zero Ltd | Professional & scientific | 2023 |
| Aimless Play Ltd | Professional & scientific | 2021 |
| Aims Consulting Services Ltd | Information & communication | 2018 |
| Aimtech International Ltd | Professional & scientific | 2021 |
| Aimtila Limited | Financial services | 2026 |
| Aina Laine LP | | 2016 |
| Aindrea Development LP | | 2013 |
| Ainglean Ltd | Hospitality | 2022 |
| Aioes (ALL in One Energy Solutions) Ltd | Wholesale & retail | 2024 |
| AIP Infrastructure LP | | 2017 |
| Air Accountancy Ltd | Professional & scientific | 2026 |
| Air BAG Stopper Holdings Limited | Professional & scientific | 2007 |
| Air Catch LP | | 2017 |
| Air Control Pilates Limited | Education | 2016 |
| Air Edinburgh Ltd | Real estate | 2021 |
| Air Equipment Limited | Wholesale & retail | 2022 |
| Air Innovation Robotics Limited | Manufacturing | 2024 |
| Air Link (Scotland) Limited | Administrative & support | 1990 |
| Air MCN LP | | 2016 |
| Air Property Group Ltd | Real estate | 2020 |
| Air Quality & Safety Consulting Ltd | Professional & scientific | 2019 |
| Air Street Capital I (FP) LP | | 2018 |
| Air to Stay Ltd | Hospitality | 2018 |
| Air Westan Group LP | | 2019 |
| Airboss Company (EU) LP | | 2016 |
| Airco Developments Limited | Manufacturing | 2008 |
| Aircraft Productions Ltd | Information & communication | 2025 |
| Aird Advisors Ltd | Administrative & support | 2022 |
| Aird Group Limited | Professional & scientific | 2013 |
| Aird Properties Limited | Real estate | 1997 |