| AD Astra Homes Limited | Real estate | 2020 |
| AD Estate Group Limited | Real estate | 2023 |
| AD Ignite Limited | Transport & logistics | 2021 |
| AD Midland Limited | Transport & logistics | 2013 |
| AD Optometry Ltd | Health & social care | 2024 |
| AD Scaffolding (Leicester) Limited | Construction | 2012 |
| AD Skip Hire Ltd | Water & waste | 2023 |
| AD Supplies Ltd | Wholesale & retail | 2022 |
| Ad's Online Retail Limited | Extraterritorial | 2020 |
| Ad-Mar Trans Ltd | Transport & logistics | 2024 |
| AD13 Ltd | Real estate | 2026 |
| AD345 Limited | Hospitality | 2025 |
| AD5 Double Glazing Limited | Construction | 2023 |
| Adaez Group Limited | Health & social care | 2022 |
| Adagi Transport Ltd | Transport & logistics | 2015 |
| Adagio Films Limited | Information & communication | 2023 |
| Adam & Co. (Textiles) Limited | Manufacturing | 1979 |
| Adam 4 YOU Ltd | Wholesale & retail | 2017 |
| Adam Constructions (Leicester) Ltd | Construction | 2013 |
| Adam Danial Engineering Services Ltd | Professional & scientific | 2023 |
| Adam Grey Ltd | Professional & scientific | 2014 |
| Adam Group Ventures Ltd | Real estate | 2025 |
| Adam Holdings Leicester Ltd | Real estate | 2025 |
| Adam Holdings Limited | Other services | 2017 |
| Adam Law UK Limited | Professional & scientific | 2025 |
| Adam Patel 2 Ltd | Health & social care | 2023 |
| Adam Patel Ltd | Health & social care | 2021 |
| Adam Szmigiel Transport Ltd | Transport & logistics | 2018 |
| Adam Toone Services Limited | Construction | 2016 |
| Adam Tuziemski Ltd | Administrative & support | 2018 |
| Adams Cabs Ltd | Transport & logistics | 2023 |
| Adams Carpets Ltd | Wholesale & retail | 2019 |
| Adams Leicester Limited | Wholesale & retail | 2019 |
| Adams Plastering Limited | Construction | 2023 |
| Adams Property Services (Leicester) Ltd | Administrative & support | 2005 |
| Adams Retail Enterprise UK Ltd | Wholesale & retail | 2026 |
| Adamz Accountancy Ltd | Professional & scientific | 2025 |
| Adam’S Farm Foods Ltd | Wholesale & retail | 2020 |
| Adana Management Group Limited | Administrative & support | 2012 |
| Adapt Harmony Care Homes Ltd | Health & social care | 2024 |
| Adaptable Building Solutions Ltd | Construction | 2023 |
| Adaptive Life Transitions Ltd | Health & social care | 2024 |
| Adaptus Cares Limited | Health & social care | 2013 |
| Adare SEC (Nottingham) Limited | Manufacturing | 2016 |
| Adare SEC Limited | Manufacturing | 1993 |
| Adas Leicester Limited | Wholesale & retail | 2018 |
| ADB Fashion UK Ltd | Manufacturing | 2024 |
| Adbstyle UK Limited | Manufacturing | 2025 |
| ADC Support Ltd | Health & social care | 2026 |
| Adcb Ltd | Construction | 2018 |
| Adco Media Ltd | Professional & scientific | 2024 |
| ADD Group Holdings Limited | Other services | 2014 |
| ADD Reality Limited | Wholesale & retail | 2013 |
| Added Security Limited | Construction | 2018 |
| Addeen Tours Limited | Administrative & support | 2023 |
| Adder Properties Limited | Real estate | 2018 |
| Adder Technology Limited | Manufacturing | 1984 |
| Addi Care Services Ltd | Health & social care | 2020 |
| Addison Couriers Ltd | Transport & logistics | 2014 |
| Addison Hunt Ltd | Administrative & support | 2016 |
| Additions Recruitment Consultants Limited | Transport & logistics | 2004 |
| ADE Care Services Limited | Real estate | 2020 |
| ADE London Ltd | Construction | 2019 |
| Adeelaftab Ltd | Wholesale & retail | 2023 |
| Adel Motors Ltd | Wholesale & retail | 2024 |
| Adela Crystal Minerals Ltd | Professional & scientific | 2024 |
| Adela Investments Ltd | Real estate | 2024 |
| Adelaide Buildings Limited | Construction | 2017 |
| Adelb Ltd | Wholesale & retail | 2023 |
| Adelik Ltd | Wholesale & retail | 2022 |
| Aden IO Ltd | Information & communication | 2018 |
| Adentia Ltd | Real estate | 2023 |
| Adepa Consulting Ltd | Professional & scientific | 2025 |
| Adept Ergonomics Limited | Professional & scientific | 2010 |
| Adept Estates Ltd | Real estate | 2023 |
| Adept Health and Social Care Ltd | Administrative & support | 2023 |
| Adeptec Ltd | Professional & scientific | 2026 |
| Adepto Drivers Limited | Transport & logistics | 2014 |
| Adeson Cabs Limited | Transport & logistics | 2026 |
| Adeyna Relocations Ltd | Real estate | 2025 |
| ADF Projects Ltd | Professional & scientific | 2022 |
| Adfocks Ltd | Information & communication | 2025 |
| Adgent Ltd | Information & communication | 2024 |
| Adhart Consulting Ltd | Professional & scientific | 2026 |
| Adhd Plus Ltd | Health & social care | 2024 |
| Adhi’S Kanthari Ltd | Hospitality | 2025 |
| ADI School of Motoring Ltd | Education | 2024 |
| ADI Sourcing Ltd | Real estate | 2026 |
| Adi-Rep Limited | Wholesale & retail | 2019 |
| Adikeshava Ltd | Health & social care | 2025 |
| Adilah Mahmood Limited | Other services | 2022 |
| Adimad Productions Ltd | Information & communication | 2015 |
| Adinah Management Services Limited | Real estate | 2010 |
| Aditus International Limited | Information & communication | 2023 |
| Adjajooe Healthcare Ltd | Health & social care | 2021 |
| ADK Medical Ltd | Health & social care | 2026 |
| ADL Transport Ltd | Transport & logistics | 2022 |
| Adll Ltd | Administrative & support | 2024 |
| ADM Capital Limited | Financial services | 2020 |
| ADM Fortuna Ltd | Real estate | 2025 |