| A1 Roofcare & Guttering Ltd | Construction | 2025 |
| A1 Store Bristol Ltd | Wholesale & retail | 2025 |
| A12A Global Ltd | Professional & scientific | 2015 |
| A1DECOY Limited | Arts & recreation | 2013 |
| A2 IT Cloud Solutions Ltd | Wholesale & retail | 2023 |
| A2 Lifts Ltd | Manufacturing | 2026 |
| A2B Exec Ltd | Transport & logistics | 2024 |
| A2G Cyber Limited | Information & communication | 2020 |
| A2I Transcription Services Limited | Professional & scientific | 2005 |
| A2Z (South West) Ltd | Households | 2024 |
| A2Z Fruit & VEG Ltd | Wholesale & retail | 2019 |
| A2Z Phone Art Ltd | Wholesale & retail | 2024 |
| A2Z Technologies Ltd | Information & communication | 2003 |
| A366 Ltd | Real estate | 2018 |
| A4 Biba Limited | Real estate | 2025 |
| A4 Health Group Limited | Health & social care | 2012 |
| A4 Parking Limited | Transport & logistics | 2015 |
| A4P Care Ltd | Health & social care | 2024 |
| A5 MBL Ltd | Information & communication | 2010 |
| A7SPORTSWEAR Ltd | Extraterritorial | 2019 |
| A@Tm Management Lettings Limited | Real estate | 2025 |
| AA 16122025 Limited | Extraterritorial | 2010 |
| AA Access Scaffolding Limited | Construction | 2023 |
| AA Accountants (UK) Ltd | Professional & scientific | 2009 |
| AA Fabrics Ltd | Wholesale & retail | 2025 |
| AA Fish & Chips Ltd | Hospitality | 2021 |
| AA Law Limited | Professional & scientific | 2012 |
| AA Nest Home Rental Ltd | Real estate | 2025 |
| AA Property & Development Ltd | Real estate | 2026 |
| AA Property Maintenance (SW) Limited | Construction | 2013 |
| AA Rubbish Clearance Ltd | Water & waste | 2023 |
| AA Skincare Limited | Professional & scientific | 2026 |
| AA Synergy Ltd | Professional & scientific | 2023 |
| AA Taxis Ltd | Administrative & support | 2016 |
| AA Trademarks Limited | Extraterritorial | 2018 |
| AA Visuals Limited | Professional & scientific | 2015 |
| AA74UK Ltd | Transport & logistics | 2018 |
| AAA Contractors (Bristol) Ltd | Construction | 2023 |
| AAA Holdings (Bristol) Ltd | Real estate | 2024 |
| AAA Interactive Ltd | Information & communication | 2023 |
| AAA Investor Immigration Limited | Professional & scientific | 2015 |
| Aabelov Ltd | Transport & logistics | 2013 |
| AAC Ellery Property Ltd | Households | 2022 |
| Aace Group Limited | Financial services | 2016 |
| AAD Express Limited | Transport & logistics | 2023 |
| Aadhav Limited | Real estate | 2025 |
| Aadhvytha Gruhasampadah Limited | Real estate | 2022 |
| Aadit Ventures Ltd | Wholesale & retail | 2026 |
| Aadvik Retail Ltd | Wholesale & retail | 2022 |
| AAE Properties Limited | Real estate | 2018 |
| Aaequus Ltd | Other services | 2021 |
| Aafaa Ltd | Real estate | 2022 |
| AAK Property Ltd | Real estate | 2023 |
| Aakb Ltd | Construction | 2025 |
| Aakc Ltd | Real estate | 2023 |
| Aalay Assets Limited | Real estate | 2019 |
| Aanamutta Limited | Wholesale & retail | 2024 |
| AAR Properties Bristol Limited | Real estate | 2023 |
| Aaramba Management Limited | Real estate | 2024 |
| Aarambha Tech Limited | Professional & scientific | 2024 |
| Aarathan Consulting Ltd | Professional & scientific | 2024 |
| Aardman Arthur Christmas Limited | Information & communication | 2009 |
| Aardman Beastly Bites Limited | Information & communication | 2024 |
| Aardman Chicken Run Limited | Extraterritorial | 1997 |
| Aardman Creature Comforts USA Limited | Extraterritorial | 2000 |
| Aardman Employee Ownership Trustee Limited | Professional & scientific | 2018 |
| Aardman Feature Development Limited | Information & communication | 2008 |
| Aardman Free Range Limited | Information & communication | 2017 |
| Aardman Mossy Bottom Limited | Information & communication | 2016 |
| Aardman Shaun the Sheep Limited | Information & communication | 2012 |
| Aardman Sugarloaf Limited | Information & communication | 2024 |
| Aardvark Arts & Crafts Ltd | Wholesale & retail | 2003 |
| Aardvark Promotions Ltd | Wholesale & retail | 2000 |
| Aaron Metal & Plastic Supplies Limited | Other services | 1988 |
| Aarongeis.Com Ltd | Professional & scientific | 2015 |
| Aartliis Property Group Ltd | Real estate | 2021 |
| Aaruaathi Ltd | Real estate | 2026 |
| Aarudra Properties Ltd | Real estate | 2024 |
| Aarusha Limited | Wholesale & retail | 2021 |
| Aarya Aerotek Limited | Administrative & support | 2009 |
| AAS Bristol Limited | Hospitality | 2019 |
| AAS Investments & Consultancy Limited | Real estate | 1998 |
| Aashman Power Limited | Energy | 2010 |
| Aasri Sales & Services Ltd | Wholesale & retail | 2026 |
| Aastbury Ltd | Wholesale & retail | 2025 |
| Aathi Properties (UK) Ltd | Real estate | 2022 |
| Aathiraa Ltd | Wholesale & retail | 2023 |
| Aathiya Ltd | Wholesale & retail | 2025 |
| Aawrish Ltd | Information & communication | 2023 |
| Aaxa Technologies Limited | Wholesale & retail | 2013 |
| Aayan Serives Bristol Limited | Other services | 2020 |
| Aayansh Limited | Real estate | 2021 |
| AB Civils Ltd | Construction | 2014 |
| AB FAB Textiles LLP | | 2019 |
| AB Fisheries Ltd | Agriculture & fishing | 2025 |
| AB Fluid Power Ltd. | Manufacturing | 1991 |
| AB Forever Care Limited | Health & social care | 2026 |
| AB Holdings (Bristol) Ltd | Construction | 2018 |
| AB Morris Properties Ltd | Real estate | 2024 |
| AB Surfacing Ltd | Construction | 2005 |