| ABC Civil Engineering Services Limited | Construction | 1988 |
| ABC Plant Hire Ltd | Administrative & support | 2022 |
| Abct.Net Limited | Information & communication | 2016 |
| Abfallbehalter & Container Weber UK Ltd | Administrative & support | 2010 |
| ABI & Kishor Ltd | Wholesale & retail | 2019 |
| ABI and Kishor Property Limited | Real estate | 2024 |
| ABI Property Developments Ltd | Construction | 2014 |
| Above the Cloud Consultancy Ltd | Professional & scientific | 2018 |
| Absent Mark Limited | Arts & recreation | 2015 |
| Absolute Drainage Solutions Ltd | Administrative & support | 2023 |
| Absolute Network Solutions Limited | Information & communication | 2000 |
| Absolute Pearls Limited | Wholesale & retail | 2011 |
| Absy Limited | Wholesale & retail | 2021 |
| Abundance Holdings Ltd | Wholesale & retail | 2024 |
| Acacia Coffee Ltd | Hospitality | 2016 |
| Accap Consultancy Ltd | Professional & scientific | 2015 |
| Accd Projects Ltd | Professional & scientific | 2024 |
| Accented Properties Limited | Real estate | 2020 |
| Accentuate Games Ltd | Manufacturing | 2013 |
| Accepta Ltd | Wholesale & retail | 2001 |
| Access 27 Ltd. | Arts & recreation | 2017 |
| Access Personal Checking Services Ltd | Other services | 2010 |
| Accessible Bungalow Holidays UK Ltd | Hospitality | 2021 |
| Accounts UN Limited | Professional & scientific | 2012 |
| Accro Kitchens & Bathrooms Limited | Construction | 2019 |
| Ace Computers Limited | Wholesale & retail | 2009 |
| Ace Drop Entertainment Limited | Arts & recreation | 2025 |
| Acer Petroleum Xploration Ltd | Mining & quarrying | 2026 |
| Acflt Consultancy Ltd | Health & social care | 2017 |
| ACG Veterinary Consultancy Limited | Professional & scientific | 2016 |
| ACK Couriers Limited | Transport & logistics | 2016 |
| ACL Grabhire Limited | Construction | 2018 |
| Acld Marketing Ltd | Professional & scientific | 2020 |
| Acrerae Limited | Real estate | 2025 |
| ACS Solicitors Ltd. | Extraterritorial | 2010 |
| Acsa Investments Ltd | Real estate | 2026 |
| Action Against Carbon Capture and Storage Limited | Other services | 2026 |
| Activate Business Systems Limited | Information & communication | 1998 |
| Active Communication Solutions Limited | Information & communication | 1993 |
| Active-Itc Ltd | Professional & scientific | 2007 |
| Activity for ALL AP Ltd | Arts & recreation | 2016 |
| Activity for ALL Hub CIC | Arts & recreation | 2012 |
| Activity for ALL in the Community Limited | Education | 2022 |
| Activity for ALL WA Ltd | Arts & recreation | 2023 |
| Actualise Coaching and Training Ltd | Professional & scientific | 2018 |
| Actuarial Analytics Limited | Financial services | 2018 |
| Acuity Investors Ltd | Financial services | 2025 |
| Acumen Strategy Partners Limited | Professional & scientific | 2004 |
| Acute Care Direct Limited | Wholesale & retail | 2015 |
| AD Health Solutions Ltd | Information & communication | 2024 |
| ADA Dakin Limited | Wholesale & retail | 2019 |
| Adam Kettell Ltd | Professional & scientific | 2018 |
| Adam Restaurant Liverpool Limited | Hospitality | 2023 |
| Adams Marine Services Ltd | Professional & scientific | 2013 |
| Adams Vehicle Placements Ltd | Other services | 2008 |
| Adano's Catering Ltd | Hospitality | 2025 |
| Adapt Rope Access Limited | Construction | 2025 |
| ADB Acorn Ltd | Professional & scientific | 2022 |
| ADC Civils Ltd | Construction | 2024 |
| ADC Entrance Solutions Limited | Construction | 1997 |
| Adcon Consultancy Ltd | Professional & scientific | 2018 |
| ADD Online Ltd | Wholesale & retail | 2020 |
| Addition Design Ltd | Manufacturing | 2017 |
| Adelae Ltd | Real estate | 2019 |
| Adept Concepts UK Ltd | Construction | 2013 |
| Adept HSG Limited | Wholesale & retail | 2016 |
| Adept New Builds Ltd | Construction | 2021 |
| Adepto Acquisitions Ltd | Professional & scientific | 2013 |
| Adeptus Data Services Ltd | Information & communication | 2024 |
| Adeve Holdings Limited | Financial services | 2025 |
| Adeve Properties Limited | Real estate | 2025 |
| ADI Competitions Ltd | Arts & recreation | 2026 |
| Adiuvex Ltd | Professional & scientific | 2007 |
| Admo Pizza Magic Ltd | Hospitality | 2023 |
| Adnova Limited | Professional & scientific | 2019 |
| Adorcist Ltd | Information & communication | 2026 |
| Adrienne Kelbie Coaching Ltd | Professional & scientific | 2022 |
| ADS Group Holdings Ltd | Financial services | 2023 |
| Adservio Limited | Transport & logistics | 2020 |
| ADT Wirral Ltd | Transport & logistics | 2023 |
| Advance Systems (NW) Limited | Administrative & support | 2015 |
| Advanced Control Limited | Information & communication | 2019 |
| Advanced Control Partnerships Limited | Information & communication | 2013 |
| Advanced Innovation Insights Ltd | Information & communication | 2019 |
| Advanced Mentoring Education Ltd | Education | 2022 |
| Advanced Window and Door Systems Ltd | Administrative & support | 2024 |
| Advantage Sports + Entertainment Holdings Ltd | Professional & scientific | 2024 |
| Advento Group Ltd | Professional & scientific | 2023 |
| Adwick Advisory Ltd | Professional & scientific | 2022 |
| AE Global Group Ltd | Professional & scientific | 2025 |
| AE Marine & Consultancy Services Ltd | Professional & scientific | 2017 |
| AEB Caterers Limited | Hospitality | 2009 |
| Aerial Automated Projects Limited | Manufacturing | 2024 |
| Aerogrow Limited | Agriculture & fishing | 2025 |
| Aerospace Specialist Services Limited | Professional & scientific | 2014 |
| Aesthetics by Shannon Ltd | Health & social care | 2025 |
| Aesthetics Training Academy (NW) Ltd | Health & social care | 2025 |
| AF Prestige Pet Care Ltd | Other services | 2025 |
| AF Training and Consultancy Ltd | Education | 2022 |
| AFB HR & Recruitment Consultancy Ltd | Professional & scientific | 2026 |