| Abmt Property Consultants Ltd | Real estate | 2012 |
| ABN Solicitors Ltd | Professional & scientific | 2018 |
| Abode With ME Ltd | Real estate | 2025 |
| Above Music Group Limited | Information & communication | 2019 |
| ABP (Wellcare) Limited | Wholesale & retail | 2021 |
| ABP Estates Limited | Wholesale & retail | 2023 |
| ABP Wellcare (East Finchley) Ltd | Wholesale & retail | 2022 |
| ABP Wellcare (Twickenham) Ltd | Wholesale & retail | 2025 |
| ABR Associates Limited | Professional & scientific | 2009 |
| Abridge Solutions Limited | Manufacturing | 2026 |
| Absolute International Limited | Professional & scientific | 2005 |
| Absolute Records Ltd | Information & communication | 2014 |
| Absu Investments Limited | Real estate | 2022 |
| Abvp Pharma 2 Ltd | Wholesale & retail | 2025 |
| Abvp Pharma Ltd | Wholesale & retail | 2025 |
| AC Rhythms Radio Limited | Information & communication | 2025 |
| Academic Underdogs Ltd | Information & communication | 2015 |
| Acclytics Accounting Ltd | Professional & scientific | 2020 |
| Accord Property Management Limited | Administrative & support | 2005 |
| Accordus Limited | Professional & scientific | 2018 |
| Accountancy Action London Limited | Professional & scientific | 2010 |
| Accountax Care Limited | Professional & scientific | 2010 |
| Accv Limited | Construction | 2016 |
| ACD Limited | Real estate | 2017 |
| Ace Accountancy and Consultancy Ltd. | Professional & scientific | 2018 |
| Ace Accountancy Ltd | Professional & scientific | 2018 |
| Ace Boilers & Heat Pump Limited | Administrative & support | 2024 |
| Ace Brokers Ltd | Financial services | 2012 |
| Ace Business Solutions Ltd | Professional & scientific | 2025 |
| Ace Greenacre Ltd | Wholesale & retail | 2014 |
| Ace IT & Recruitment Solutions Ltd | Information & communication | 2018 |
| Ace Payroll Limited | Administrative & support | 2019 |
| Ace Pickleball Academy Ltd | Arts & recreation | 2025 |
| Ace Supplements Ltd | Wholesale & retail | 2012 |
| Acebes Livelo Ltd | Public administration | 2024 |
| Achieve With Numbers PVT Ltd | Professional & scientific | 2026 |
| ACI Care Ltd | Health & social care | 2021 |
| Acjh Services Ltd | Construction | 2020 |
| Acksha Ltd | Real estate | 2022 |
| ACL Lighting Ltd | Construction | 2014 |
| ACM Consultants (UK) Limited | Professional & scientific | 2007 |
| Acoustic Facades Limited | Construction | 2021 |
| Acpi Consultants Ltd | Professional & scientific | 1999 |
| Acquireme Ltd | Professional & scientific | 2017 |
| ACR Investments Limited | Real estate | 2012 |
| ACR KB Ltd | Hospitality | 2025 |
| Acrewood Medical Limited | Health & social care | 2009 |
| Acrobat Licensing Limited | Information & communication | 2006 |
| Acrobat Music Limited | Information & communication | 2003 |
| ACS Investment Holdings Limited | Financial services | 2023 |
| AD Chauffeurs Limited | Transport & logistics | 2011 |
| AD Plastic & Reconstructive Ltd | Health & social care | 2020 |
| Adam Hair Limited | Other services | 2024 |
| Adam Line Creative Ltd | Arts & recreation | 2022 |
| Additive Security Ltd | Information & communication | 2019 |
| Addr Properties Limited | Real estate | 2017 |
| Aderfia LLP | | 2022 |
| Adfm Films Ltd | Information & communication | 2023 |
| Adgenius Ltd | Wholesale & retail | 2018 |
| Adina Home Care Services Ltd | Other services | 2017 |
| Adinstant Ltd | Information & communication | 2023 |
| Adisree Consultancy Services Limited | Information & communication | 2025 |
| Aditya Capital Ltd | Financial services | 2021 |
| Aditya Design and Build Limited | Construction | 2019 |
| Adnaan Maan Limited | Health & social care | 2006 |
| Adolphus Care Ltd. | Real estate | 2002 |
| Adonixai Limited | Information & communication | 2025 |
| Adrian Freight Transport Ltd | Transport & logistics | 2022 |
| Adroit Financial Services Limited | Financial services | 2020 |
| Adspv Limited | Professional & scientific | 2012 |
| Advana Capital Advisors Limited | Professional & scientific | 2025 |
| Advance Plastic Surgery Limited | Health & social care | 2024 |
| Advanced Advertising Limited | Professional & scientific | 2019 |
| Advanced Aesthetic Solutions Ltd | Other services | 2018 |
| Advanced Education Ltd | Information & communication | 2017 |
| Advancefield Limited | Wholesale & retail | 1995 |
| Advancemore Healthcare Ltd | Financial services | 2025 |
| Advantis Global Group Ltd | Professional & scientific | 2020 |
| Advantis Global Ltd | Manufacturing | 2018 |
| Adveert Limited | Professional & scientific | 2017 |
| Adventures Limited | Administrative & support | 1999 |
| Advina Healthcare Limited | Health & social care | 2021 |
| Advina Properties Limited | Real estate | 2025 |
| Adviser Networks Limited | Professional & scientific | 2006 |
| Aequitas Accountants Ltd | Professional & scientific | 2012 |
| Aerion Design Labs Limited | Information & communication | 2015 |
| Aerospacemedtech Limited | Health & social care | 2021 |
| Aerova Aviation Limited | Professional & scientific | 2025 |
| Aesap Limited | Professional & scientific | 2022 |
| Aesthetic Marketing Limited | Other services | 2018 |
| Aesthetic Plastic Surgery UK Ltd | Financial services | 2011 |
| Aesthetics by Luana Ltd | Health & social care | 2025 |
| Aeternus Property Ltd | Real estate | 2025 |
| Affinitysolutionuk Ltd | Information & communication | 2026 |
| Affno Property Services Ltd | Real estate | 2007 |
| AFH Financial Consultants Ltd | Professional & scientific | 2021 |
| Afrakay Enterprise Limited | Wholesale & retail | 2026 |
| African Business Women CIC | Hospitality | 2025 |
| African Visions (UK) Limited | Professional & scientific | 2004 |
| Afshaj Goods Ltd | Education | 2023 |