| ABQ Leisure Limited | Hospitality | 2015 |
| ABQ Leisure Management Ltd | Hospitality | 2023 |
| ABQ NEO Restaurant Ltd | Hospitality | 2018 |
| ABQ Park Central Ltd | Hospitality | 2019 |
| ABQ Properties UK Ltd | Hospitality | 2023 |
| ABQ Riviera Hotel Ltd | Hospitality | 2022 |
| ABQ Trading & Contracting UK Ltd | Real estate | 2021 |
| ABR Ecology Ltd | Professional & scientific | 2018 |
| Abrahams Legal Consultancy Ltd | Professional & scientific | 2020 |
| ABS Events UK Ltd | Administrative & support | 2024 |
| Absolute Business Solutions Limited | Other services | 2017 |
| Absolute Chiropractic Limited | Wholesale & retail | 2020 |
| Absolute DT Limited | Construction | 2015 |
| Absolute Elevation Ltd | Education | 2022 |
| Absolute Music Solutions Limited | Wholesale & retail | 2003 |
| Absolute Thai Massage Co. Ltd | Health & social care | 2024 |
| Abterra Ltd | Extraterritorial | 2018 |
| ABU Motorsports Ltd | Professional & scientific | 2023 |
| ABY Holdings Ltd | Real estate | 2025 |
| AC Clinic Ltd | Health & social care | 2024 |
| AC Heating & GAS Ltd | Construction | 2023 |
| AC Property Bournemouth Ltd | Real estate | 2021 |
| AC XXX Ltd | Health & social care | 2023 |
| Ac-Super Ltd | Professional & scientific | 2023 |
| Academic Book Services Limited | Wholesale & retail | 2014 |
| Academy Developments (Bournemouth) Limited | Real estate | 2000 |
| Acbbas Limited | Other services | 2019 |
| Accademy Ltd | Education | 2023 |
| Accelerated Marketing Solutions Limited | Professional & scientific | 2010 |
| Accent Coaching Ltd | Education | 2025 |
| Acceptance Homes Ltd | Households | 2025 |
| Access Advertising, Marketing and Design Limited | Professional & scientific | 1999 |
| Access Business Capital UK Ltd | Financial services | 2017 |
| Access Consulting Group Limited | Professional & scientific | 2016 |
| Access Dorset Ltd | Other services | 2010 |
| Access for ALL Seaside Holidays Limited | Hospitality | 2010 |
| Access Pro Services Limited | Professional & scientific | 2018 |
| Access Safety Solutions Ltd | Construction | 2013 |
| Accessbliss Ltd | Professional & scientific | 2024 |
| Acch Property Ltd | Hospitality | 2022 |
| Accolade Building Partnership Ltd | Financial services | 2021 |
| Accoplan Ltd | Professional & scientific | 2014 |
| Accountancy Fellowship Ltd | Professional & scientific | 2006 |
| Accountancy.Coop Limited | Professional & scientific | 2003 |
| Accountant Bookkeeping Ltd | Professional & scientific | 2021 |
| Accountimise Ltd | Professional & scientific | 2021 |
| Accounting for Neurodiversity CIC | Education | 2025 |
| Accuracy Construction Ltd | Construction | 2017 |
| Accurate Complete Accounting Ltd | Professional & scientific | 2011 |
| Accurate International Business Ltd | Professional & scientific | 2026 |
| Accurate Survey’S Limited | Financial services | 2022 |
| Ace & Maya Limited | Manufacturing | 2019 |
| Ace IT Consulting Limited | Information & communication | 2020 |
| Ace Office Environments Limited | Wholesale & retail | 1963 |
| Ace Paint Decor & Design Ltd | Construction | 2025 |
| Ace Plumbing Limited | Construction | 1999 |
| Ace Rent a Luton Limited | Administrative & support | 2010 |
| Ace Sustainability Club Ltd | Administrative & support | 2007 |
| Ace Workplace Ltd | Professional & scientific | 1999 |
| Ace Workplace Solutions Ltd | Professional & scientific | 2006 |
| ACF Co Holdings Limited | Agriculture & fishing | 2009 |
| ACH Owners Limited | Households | 2018 |
| Acharyaservices Ltd | Education | 2026 |
| Acoria Limited | Administrative & support | 2017 |
| Acorn Construction (Southern) Limited | Construction | 2011 |
| Acorn Floor Sanding Limited | Construction | 2015 |
| Acorn Property Management (Sussex) Ltd | Households | 2016 |
| Acorns Management (Bournemouth) Limited | Households | 2002 |
| Acoteias Limited | Administrative & support | 2016 |
| ACP Windows Ltd | Construction | 2020 |
| Acquire Offshore Marine Services Ltd | Mining & quarrying | 2020 |
| ACR UK Solutions Limited | Wholesale & retail | 2023 |
| Acsoi Studio Ltd | Information & communication | 2025 |
| Acta Consulting Limited | Information & communication | 2024 |
| Actech Business Solutions Limited | Professional & scientific | 2014 |
| Actin Web Marketing Limited | Information & communication | 2015 |
| Action Alarms Limited | Construction | 1999 |
| Active Dorset CIC | Arts & recreation | 2009 |
| Active Ignite Ltd | Arts & recreation | 2024 |
| Active Innovations Investments Limited | Extraterritorial | 2017 |
| Active Innovations Limited | Education | 2000 |
| Active Mentoring Limited | Education | 2024 |
| Active Slim Limited | Information & communication | 2010 |
| Actuation Consulting Limited | Professional & scientific | 2016 |
| Acuitas CTD Ltd | Professional & scientific | 2014 |
| Acupec Limited | Professional & scientific | 2018 |
| Acworth & Jarvis Ltd | Professional & scientific | 2005 |
| Adacee Limited | Information & communication | 1998 |
| Adam Reveley Contracting Services Ltd | Construction | 2023 |
| Adam Rose Aviation Ltd | Professional & scientific | 2018 |
| Adam Urban Construction Ltd | Construction | 2017 |
| Adambylina Ltd | Transport & logistics | 2018 |
| Adams Property Solutions Limited | Real estate | 2006 |
| Adap Consulting Limited | Professional & scientific | 2014 |
| Adapr Ltd | Health & social care | 2024 |
| Adapt Contracts Ltd | Other services | 2009 |
| Adapt Mechanical Services Ltd | Construction | 2024 |
| Adaptive Care Ltd | Health & social care | 2021 |
| Aday Ltd | Wholesale & retail | 2018 |
| Adchievable Limited | Professional & scientific | 2016 |