| AN Impulse Limited | Real estate | 2018 |
| AN Suidhe Wind Farm Limited | Energy | 2005 |
| Ana-Ri Productions LLP | | 2022 |
| Anaesthesia Locums 2002 Limited | Health & social care | 2002 |
| Anakha's Properties Ltd | Real estate | 2021 |
| Analogwaves Limited | Information & communication | 2009 |
| Analyst Lounge Limited | Wholesale & retail | 2014 |
| Analytical Measurement Calibration and Safety Limited | Wholesale & retail | 2003 |
| Analytics Hive Ltd | Information & communication | 2019 |
| Anamaruki Ltd | Health & social care | 2017 |
| Anand Sweets Ltd | Wholesale & retail | 2023 |
| Anas STS Ltd | Wholesale & retail | 2023 |
| Anatomy of Food Ltd | Hospitality | 2023 |
| Anayat Sandhu Ltd | Transport & logistics | 2026 |
| Anca Nica Ltd | Construction | 2023 |
| Anchor Self Storage UK Ltd | Real estate | 2007 |
| Ancoria Ltd | Hospitality | 2019 |
| AND Then SUM Accounting Ltd | Professional & scientific | 2015 |
| Andco Services Ltd | Construction | 2023 |
| Anderson Health Commissioning Ltd | Professional & scientific | 2026 |
| Anderson Industrial Design Ltd | Professional & scientific | 2023 |
| Anderson Property Partners Ltd | Real estate | 2021 |
| Andrade Imports Ltd | Wholesale & retail | 2025 |
| Andrade Property Maintenance Ltd | Construction | 2024 |
| Andrea Pellegram Limited | Professional & scientific | 2014 |
| Andrei 4 Transport Ltd | Transport & logistics | 2020 |
| Andrei Brehui Ltd | Transport & logistics | 2019 |
| Andrei Courier Ltd | Transport & logistics | 2018 |
| Andrew Group Construct Ltd | Construction | 2024 |
| Andrew Pearce Limited | Construction | 2007 |
| Andrew Whelan Services Limited | Information & communication | 2015 |
| Andrew Whitlock Group Limited | Manufacturing | 2019 |
| Andrew Whitlock Limited | Manufacturing | 2019 |
| Andrew Yeats Limited | Arts & recreation | 2002 |
| Andrews Consultants Ltd | Professional & scientific | 2026 |
| Andrews Property Group Limited | Real estate | 2016 |
| Andrie Contoloru Ltd | Transport & logistics | 2019 |
| Android-De Ltd | Information & communication | 2021 |
| Andromeda Property Consultancy Ltd | Administrative & support | 2017 |
| Andromedata Ltd | Information & communication | 2024 |
| Andy Collins Events Limited | Administrative & support | 2018 |
| Andy Hall Coaching Limited | Professional & scientific | 2013 |
| Andy Ireland Ltd | Construction | 2015 |
| Andy's Kebab and Fish Ltd | Hospitality | 2019 |
| Angel Mortgages (South West) Ltd | Financial services | 2023 |
| Angel Ridge Management Company Limited | Households | 2006 |
| Angel Souls Care Ltd | Health & social care | 2018 |
| ANGEL809 Properties Limited | Real estate | 2022 |
| Angela Healthcare Ltd | Health & social care | 2019 |
| Angela Modade Properties Limited | Real estate | 2018 |
| Angell and Chambers Carpentry Ltd | Manufacturing | 2017 |
| Angels Life Support Limited | Extraterritorial | 2022 |
| Angerinick Ltd | Health & social care | 2018 |
| Angleseyproperty Limited | Households | 2020 |
| Anglo Hannover Limited | Real estate | 2025 |
| ANI DE Properties Limited | Real estate | 2021 |
| ANI Systems Limited | Information & communication | 2011 |
| Anike Wariebi Coaching & Consulting Ltd | Professional & scientific | 2025 |
| Animal Anthems Ltd | Information & communication | 2025 |
| Animor Group Limited | Professional & scientific | 2014 |
| Anisa Café Limited | Real estate | 2015 |
| Anla Design Limited | Wholesale & retail | 2025 |
| Anmcc International Laundry Consultancy Limited | Professional & scientific | 2025 |
| Anmol Haulier Limited | Transport & logistics | 2016 |
| Anna Medical Aesthetics Limited | Health & social care | 2017 |
| Anna Medical Group Ltd | Financial services | 2026 |
| Annie Foffano Spmu & Skin Ltd | Other services | 2023 |
| Anokhi Winchester Limited | Wholesale & retail | 2010 |
| Another Perfect Delivery Limited | Manufacturing | 2000 |
| Another World Festivals Ltd | Arts & recreation | 2017 |
| Anova Solutions Limited | Professional & scientific | 2015 |
| Anpaik Ltd | Wholesale & retail | 2026 |
| Anr-R Ltd | Wholesale & retail | 2023 |
| Ansco Holdings Limited | Financial services | 2018 |
| Anson Planning Ltd | Professional & scientific | 2023 |
| Ansrad Consulting Ltd | Information & communication | 2018 |
| Answer Estates Limited | Real estate | 2025 |
| Answer Technologies Limited | Information & communication | 2023 |
| ANT & SIM Ltd | Health & social care | 2017 |
| Ant-Ique Games Ltd | Information & communication | 2025 |
| Anterior Compliance Solutions Ltd | Professional & scientific | 2019 |
| Anthony Ideas Ltd | Transport & logistics | 2022 |
| Anthony LEE Ltd | Health & social care | 2020 |
| Anthony Road Management Co. Limited | Hospitality | 1976 |
| Anthony Salter Real Estate Limited | Real estate | 2024 |
| Anthony Tanner Limited | Construction | 2002 |
| ANTHONYCHACHA080576 Ltd | Extraterritorial | 2024 |
| Antonia & Cosmin Ltd | Transport & logistics | 2021 |
| Antonio Consulting Ltd | Professional & scientific | 2025 |
| Antonio Fernandes Online Courses Ltd | Information & communication | 2020 |
| Antonio Junior Logistics Ltd | Transport & logistics | 2025 |
| Antonio Services Ltd | Transport & logistics | 2025 |
| ANU Software Solutions Ltd | Information & communication | 2014 |
| Anuran Security Advisors Ltd | Information & communication | 2016 |
| Anytech Limited | Manufacturing | 2012 |
| Anytech Property Services Ltd | Real estate | 2023 |
| Anything Stone UK Limited | Manufacturing | 2004 |
| Anytime Storage Ltd | Other services | 2023 |
| Anzen Safety & Compliance Ltd | Professional & scientific | 2019 |
| Anzer Consultancy Limited | Professional & scientific | 2007 |