| A Line Art Limited | Administrative & support | 2017 |
| A Link Traders Limited | Wholesale & retail | 2026 |
| A List Accountants Ltd | Professional & scientific | 2020 |
| A List Live Ltd | Arts & recreation | 2026 |
| A List Ventures Ltd | Professional & scientific | 2018 |
| A Little Bird London Limited | Professional & scientific | 2021 |
| A Little Breathing Space Ltd | Health & social care | 2026 |
| A Little Girls Dream Ltd | Arts & recreation | 2020 |
| A Little Idea Ltd | Extraterritorial | 2013 |
| A Little Light Design Ltd | Professional & scientific | 2014 |
| A Little Longer Events Ltd | Arts & recreation | 2026 |
| A Little Louder Ltd | Professional & scientific | 2021 |
| A Little Mall Ltd | Wholesale & retail | 2023 |
| A Little Peace CIC | Education | 2026 |
| A Little Present Gift Ltd | Other services | 2019 |
| A Little Shine Event Ltd | Hospitality | 2018 |
| A Little Something by Sarah Ltd | Arts & recreation | 2014 |
| A Little Spark of Love Consulting Ltd | Education | 2025 |
| A Little Tinsel Ltd | Wholesale & retail | 2021 |
| A Little Tonic Limited | Information & communication | 2025 |
| A Little Touch of Brooklyn Ltd | Hospitality | 2025 |
| A Little Voice Limited | Professional & scientific | 2010 |
| A Lively Hope for Children and Youth in Need Foundation Ltd | Education | 2018 |
| A Living Concept INT. Ltd | Administrative & support | 2019 |
| A Lizzy Global Company Ltd | Wholesale & retail | 2024 |
| A Lkhayal Tourisme ET Exploration Limited | Administrative & support | 2024 |
| A Locomotive Pool Structure 3 Limited | Financial services | 2020 |
| A London Boutique Ltd | Wholesale & retail | 2017 |
| A London Designer Ltd | Wholesale & retail | 2026 |
| A London Flooring Company Limited | Construction | 2019 |
| A London Investments Limited | Real estate | 2022 |
| A London Project Ltd | Wholesale & retail | 2024 |
| A London Property Services Ltd | Real estate | 2024 |
| A London Swimwear Ltd | Wholesale & retail | 2025 |
| A Lone Star Ltd | Arts & recreation | 2025 |
| A Long Tale and Two Branches Ltd | Information & communication | 2021 |
| A Long Winter Films Ltd | Information & communication | 2024 |
| A Lost Dog Film Ltd | Arts & recreation | 2025 |
| A Love for Brands Ltd | Professional & scientific | 2018 |
| A Love Parasite LLP | | 2021 |
| A Love Supreme (Operations) Limited | Arts & recreation | 2021 |
| A Love Supreme Food Limited | Hospitality | 2026 |
| A Love Supreme Limited | Arts & recreation | 2021 |
| A LUX Detailing Ltd | Manufacturing | 2024 |
| A LUX Living Ltd | Real estate | 2023 |
| A Luxe Jewel Ltd | Wholesale & retail | 2020 |
| A Luxury Developments Ltd | Construction | 2025 |
| A Lynch Consulting Limited | Information & communication | 2018 |
| A Lynch Ltd | Information & communication | 2019 |
| A M & Cates Ltd | Real estate | 2025 |
| A M a S Limited | Real estate | 1973 |
| A M Adler Property Ltd | Real estate | 2024 |
| A M Aesthetics London Ltd | Other services | 2023 |
| A M Alexs Ltd | Construction | 2015 |
| A M Asset Management Ltd | Real estate | 2021 |
| A M B S Consultancy Limited | Professional & scientific | 2004 |
| A M Banks Ltd | Professional & scientific | 2014 |
| A M Carlisle Product Services Limited | Wholesale & retail | 2025 |
| A M Consultants London Ltd | Professional & scientific | 2013 |
| A M Couriers & Logistics Ltd | Transport & logistics | 2025 |
| A M Crace Limited | Information & communication | 2012 |
| A M D Contractors Limited | Construction | 1997 |
| A M D Holdings (UK) Limited | Construction | 2012 |
| A M D Property Solutions Limited | Construction | 2011 |
| A M Design & Development Limited | Construction | 2024 |
| A M Durrant Limited | Wholesale & retail | 2026 |
| A M Environ Ltd | Administrative & support | 2017 |
| A M Facilities Limited | Administrative & support | 2010 |
| A M Fast Food Ltd | Hospitality | 2025 |
| A M Flights & Holidays Ltd | Administrative & support | 2015 |
| A M Fraser Ltd | Professional & scientific | 2024 |
| A M G Costa Ltd | Other services | 2011 |
| A M G Plumbing Limited | Construction | 2002 |
| A M Garden Machinery Limited | Extraterritorial | 2016 |
| A M J Technology Limited | Information & communication | 2025 |
| A M James Consulting Ltd | Professional & scientific | 2021 |
| A M Khan Ltd | Health & social care | 2025 |
| A M LEE Electrical Ltd | Construction | 2026 |
| A M Mill Studio Ltd | Professional & scientific | 2020 |
| A M Motors London Ltd | Wholesale & retail | 2026 |
| A M P Accountants Ltd | Professional & scientific | 2026 |
| A M P Circuit Limited | Construction | 2026 |
| A M Phillips Education Law Limited | Professional & scientific | 2021 |
| A M Plumbing & Heating Ltd | Construction | 2017 |
| A M Pro Transport Ltd | Transport & logistics | 2023 |
| A M Psychotherapy Limited | Health & social care | 2025 |
| A M Qureshi Properties Ltd | Real estate | 2024 |
| A M R Studio Limited | Administrative & support | 2016 |
| A M Rahman Ltd | Transport & logistics | 2024 |
| A M Recovery Ltd | Administrative & support | 2026 |
| A M S Insurance Solutions Ltd | Financial services | 2007 |
| A M Safe Flow Services Ltd | Construction | 2025 |
| A M Strategy Solutions Ltd | Public administration | 2026 |
| A M Szwagrzak Limited | Information & communication | 2014 |
| A M Tax Investigations Limited | Professional & scientific | 2019 |
| A M Techno Limited | Administrative & support | 2018 |
| A M Templewood Limited | Professional & scientific | 2020 |
| A M Total Business Solutions Limited | Administrative & support | 2011 |
| A M Touring Limited | Arts & recreation | 2010 |
| A M Tyres & Motor Repairs Ltd | Wholesale & retail | 2023 |