| ADF Consulting Ltd | Information & communication | 2011 |
| ADH Care Ltd | Health & social care | 2019 |
| Adhd Connected Ltd | Health & social care | 2025 |
| Adi&Cris UK Ltd | Transport & logistics | 2022 |
| Adie Pepperdine Ltd | Professional & scientific | 2014 |
| Adis Legacy NON Profit CIC | Professional & scientific | 2022 |
| ADK Coding Limited | Information & communication | 2013 |
| ADL Sports Management LLP | | 2026 |
| ADP Transport Ltd | Transport & logistics | 2026 |
| Adrian Brown Building Services Ltd | Administrative & support | 2003 |
| Adrian James Furniture Maker Ltd | Manufacturing | 2024 |
| ADS Cleaning & Removal Ltd | Transport & logistics | 2024 |
| ADS Medical Limited | Education | 2011 |
| ADS Property Ltd | Construction | 2020 |
| Adsdf Limited | Professional & scientific | 2014 |
| Adsource Consulting Limited | Information & communication | 2023 |
| Advance Balance Limited | Other services | 2021 |
| Advance Fire Protection Ltd | Public administration | 2025 |
| Advanced Aesthetics Hair & Beauty Ltd | Other services | 2022 |
| Advanced Bottling UK Limited | Other services | 1994 |
| Advanced Brewing (UK) Limited | Wholesale & retail | 2009 |
| Advanced Building Services (Lincoln) Limited | Construction | 2021 |
| Advanced Catering Services Ltd | Manufacturing | 2007 |
| Advanced Construction (Lincoln) Limited | Construction | 2013 |
| Advanced Data Design Limited | Information & communication | 2003 |
| Advanced Developments (Lincoln) Limited | Real estate | 2021 |
| Advanced Holdings (Lincoln) Limited | Construction | 2021 |
| Advanced Management Consultancy Ltd | Professional & scientific | 2017 |
| Advanced Virtual Appointers Ltd | Professional & scientific | 2022 |
| Advanced Wave Technologies Ltd | Professional & scientific | 2019 |
| Advantage Energy Assessors Ltd | Professional & scientific | 2013 |
| Advantage First AID Limited | Wholesale & retail | 2011 |
| Advantics Medical Ltd | Health & social care | 2025 |
| ADW Engineering Consultants Ltd | Other services | 2016 |
| ADY Spencer Building Contractors Limited | Construction | 2006 |
| Ady`S Plumbing Services Limited | Construction | 2008 |
| Aerarium Financial Solutions Limited | Financial services | 2013 |
| Aeropaint Limited | Manufacturing | 2015 |
| Aeropus Limited | Real estate | 2017 |
| Aeroscope Solutions Ltd | Professional & scientific | 2025 |
| Aerosol Brands Direct Ltd | Wholesale & retail | 2023 |
| AES Dentcare Ltd | Professional & scientific | 2019 |
| Aesk Ltd | Professional & scientific | 2024 |
| Aesthetics by Naomi Jayne Limited | Other services | 2021 |
| Aetherforge Ltd | Wholesale & retail | 2025 |
| AEW Plant Hire Limited | Administrative & support | 2011 |
| AF New Solution Ltd | Transport & logistics | 2023 |
| AFC Logistics Ltd | Transport & logistics | 2026 |
| Affinity Group Services Ltd | Financial services | 1996 |
| Affinity Wedding DJ Ltd | Arts & recreation | 2018 |
| Affluent Adventurers Ltd | Administrative & support | 2026 |
| Affluent Cars Ltd | Transport & logistics | 2026 |
| AFJ Windows Limited | Administrative & support | 2026 |
| AFK Pharma Ltd | Health & social care | 2024 |
| Afrigap Group Limited | Information & communication | 2022 |
| Afriharvest Global Ltd | Wholesale & retail | 2026 |
| Afro Spice Distribution Ltd | Hospitality | 2025 |
| Afro-Luxe Ltd | Hospitality | 2025 |
| Afrohausentertainment Ltd | Administrative & support | 2026 |
| Afrohub Market Ltd | Wholesale & retail | 2026 |
| After Hours Climbing Ltd | Arts & recreation | 2026 |
| AG Ceilings (Lincs) Limited | Construction | 2008 |
| AG Construction (UK) Ltd | Construction | 2003 |
| AG LTU Driver Ltd | Transport & logistics | 2025 |
| AG Performance Ltd | Wholesale & retail | 2023 |
| AG Property Associates Limited | Real estate | 2017 |
| Ag-Enviro Limited | Agriculture & fishing | 2018 |
| Agandi (UK) Ltd | Education | 2011 |
| Agaran Trading Ltd | Wholesale & retail | 2025 |
| Agaricus Robotics Ltd | Professional & scientific | 2021 |
| Agavriloaiei Limited | Other services | 2023 |
| AGE UK Lincoln and South Lincolnshire Retail Limited | Wholesale & retail | 2003 |
| AGE UK Lincolnshire | Other services | 1999 |
| Agency & Umbrella Justice Management Ltd | Professional & scientific | 2025 |
| Agent Armour Accounts Limited | Professional & scientific | 2017 |
| Ager Group Ltd | Real estate | 2021 |
| AGH Interiors Limited | Professional & scientific | 2017 |
| Agincourt Design Limited | Information & communication | 2011 |
| Agora Fitness Ltd | Arts & recreation | 2025 |
| Agora Futures Limited | Professional & scientific | 1999 |
| AGR Industrial Services Ltd | Construction | 2024 |
| AGR Surface Preparation Ltd | Construction | 2022 |
| Agra Coningsby Limited | Hospitality | 2010 |
| Agrex Holdings Limited | Professional & scientific | 2013 |
| Agrex Limited | Agriculture & fishing | 2011 |
| Agri Intellect Holdings Ltd | Financial services | 2026 |
| Agrivice Limited | Extraterritorial | 2000 |
| AGS Namakkal Limited | Wholesale & retail | 2025 |
| Agtd Coningsby Ltd | Hospitality | 2025 |
| Aguva Ltd | Transport & logistics | 2025 |
| AH Coaching and Training Ltd | Education | 2025 |
| AH Motor Care & Detailing Ltd | Wholesale & retail | 2025 |
| Ahearn Orthopaedics Ltd | Health & social care | 2023 |
| Ahlan Lincs Ltd | Hospitality | 2025 |
| Ahmed Hameed Hospitality Limited | Hospitality | 2024 |
| Ahsoka Limited | Wholesale & retail | 2018 |
| AHW Architects Ltd | Professional & scientific | 2016 |
| AI Autosearch Ltd | Wholesale & retail | 2014 |
| AI Decisions Explanations Limited | Information & communication | 2025 |
| AI Digital Limited | Information & communication | 2017 |