| Autoworld Motors Ltd | Wholesale & retail | 2025 |
| Auua Youth CIC | Education | 2024 |
| AV at IT CIC | Information & communication | 2025 |
| AV Glass & Glazing Ltd | Construction | 2021 |
| AV Performance Ltd | Wholesale & retail | 2020 |
| AVA Multisolutions Ltd | Professional & scientific | 2020 |
| Ava's Ices Ltd | Hospitality | 2025 |
| Avali Film Ltd | Information & communication | 2019 |
| Avantis Livin Limited | Education | 2025 |
| Avantis Living Holding Limited | Real estate | 2023 |
| Avantis Living Limited | Administrative & support | 2019 |
| Avantis Living Trade Limited | Health & social care | 2022 |
| Avantis Security Ltd | Administrative & support | 2016 |
| Avants Marketing Ltd | Wholesale & retail | 2024 |
| Avanya Consulting Ltd | Professional & scientific | 2023 |
| Avartek Ltd | Wholesale & retail | 2018 |
| Avebridge Limited | Wholesale & retail | 2004 |
| Aveduff Limited | Real estate | 2004 |
| Avel Properties Ltd | Real estate | 2024 |
| Avenir Generations Ltd | Real estate | 2020 |
| Avenir Works 2 Limited | Construction | 2011 |
| Avenir Works 3 Limited | Construction | 2017 |
| Avenir Works 4 Limited | Construction | 2015 |
| Avenir Works 5 Ltd | Real estate | 2020 |
| Avenir Works 6 Ltd | Real estate | 2020 |
| Avenir Works Group Limited | Financial services | 2017 |
| Avenir Works Limited | Construction | 2012 |
| Avensis AI Solutions Ltd | Information & communication | 2026 |
| Avensis Enterprise C.I.C. | Hospitality | 2021 |
| Avensis Support Limited | Other services | 2017 |
| Aventis Homes Ltd | Real estate | 2024 |
| Aventra Rand Limited | Real estate | 2025 |
| Avenue Real Estate Limited | Other services | 2020 |
| Aver Corporation Limited | Real estate | 2014 |
| Averagecarco Ltd | Wholesale & retail | 2025 |
| Averroes Design Limited | Other services | 2007 |
| Averroes Group Limited | Administrative & support | 2009 |
| Averroes Pharmacy (Bradford) Limited | Wholesale & retail | 2011 |
| Averroes Pharmacy (Yarm) Limited | Administrative & support | 2011 |
| Avetcare Ltd | Information & communication | 2024 |
| AVF UK Limited | Construction | 2007 |
| Avgrecovercyl Ltd | Administrative & support | 2024 |
| Aviation Services Ltd | Manufacturing | 2025 |
| Avibe Studios Ltd | Information & communication | 2024 |
| Avicenna Investments Ltd | Real estate | 2016 |
| Avicenna Sanatio Pharma Ltd | Health & social care | 2008 |
| Avicenna Services Ltd | Health & social care | 2022 |
| Aview Limited | Wholesale & retail | 2018 |
| Avifauna Property Limited | Real estate | 2025 |
| Avifauna Technology Limited | Information & communication | 2018 |
| Avila Holdings Limited | Financial services | 2015 |
| Avizzod Limited | Wholesale & retail | 2026 |
| Avnic Ltd | Health & social care | 2021 |
| Avon Riverside Letting Ltd | Real estate | 2025 |
| Avondale Management Co (Shipley) Ltd. | Households | 2002 |
| AVR Sport Ltd | Wholesale & retail | 2025 |
| Avtg | Transport & logistics | 2017 |
| AW (Yorkshire) Ltd | Professional & scientific | 2025 |
| AW Healthcare Services Ltd | Health & social care | 2025 |
| AW Metals Ltd | Real estate | 2019 |
| AW Precision Group Ltd | Manufacturing | 2025 |
| AW Roberts Limited | Construction | 2007 |
| AW Services Enterprise Ltd | Construction | 2023 |
| AW3 Projects Limited | Construction | 2020 |
| AWA Design Ltd | Professional & scientific | 2025 |
| Awaan Bazaar Ltd | Wholesale & retail | 2024 |
| Awami Local Ltd | Wholesale & retail | 2018 |
| Awan Concept Ltd | Wholesale & retail | 2020 |
| Awan Estates Ltd | Real estate | 2025 |
| Awan Express Limited | Transport & logistics | 2023 |
| Awan Forecourt Ltd | Wholesale & retail | 2017 |
| Awan Logistic Services Ltd | Transport & logistics | 2023 |
| Awan Property Ltd | Real estate | 2019 |
| Awan Trade (UK) Ltd | Wholesale & retail | 2024 |
| Awasphere Ltd | Wholesale & retail | 2024 |
| AWH Homes Specialist Limited | Hospitality | 2025 |
| Awindoors Ltd | Other services | 2025 |
| Awleadmarketing Ltd | Professional & scientific | 2025 |
| AWN Ltd | Professional & scientific | 2025 |
| AXE BEY UK Ltd | Arts & recreation | 2024 |
| AXE Street Limited | Real estate | 2025 |
| Axecel Logistics Limited | Transport & logistics | 2024 |
| Axel - Elex Services Ltd. | Manufacturing | 2007 |
| Axel Distribution Ltd | Transport & logistics | 2026 |
| Axel Financial Limited | Professional & scientific | 2018 |
| Axel Legal Services Limited | Professional & scientific | 2007 |
| Axel-Elex Ltd. | Construction | 2005 |
| Axeminster Limited | Professional & scientific | 2024 |
| Axetor Limited | Real estate | 2025 |
| Axiom Accountants Ltd | Professional & scientific | 2005 |
| Axiom Trading Limited | Wholesale & retail | 2026 |
| Axiomix Ltd | Wholesale & retail | 2025 |
| Axis Children's Services Limited | Health & social care | 2025 |
| Axis Rehab Ltd | Other services | 2025 |
| Axisvent Limited | Professional & scientific | 2025 |
| Axleworks Ltd | Wholesale & retail | 2025 |
| AXN Couriers Ltd | Transport & logistics | 2019 |
| Axon International Ltd | Financial services | 2018 |
| AXP Solutions Limited | Construction | 2025 |
| Axsa Services Ltd | Wholesale & retail | 2020 |