| Adu's Care Limited | Health & social care | 2013 |
| Advanced Aesthetics Academy Ltd | Education | 2018 |
| Advanced Aesthetics Group Limited | Other services | 2018 |
| Advanced Alarms (Lincolnshire) Ltd | Administrative & support | 2010 |
| Advanced Angling Solutions Limited | Wholesale & retail | 2014 |
| Advanced Scaffolding Lmtd Ltd | Information & communication | 2022 |
| Advanced Workforce Solutions Limited | Administrative & support | 2020 |
| Advantlets Ltd | Real estate | 2023 |
| Advanture Leisure Campers Ltd | Wholesale & retail | 2023 |
| Advanture Leisure Campervans Ltd | Wholesale & retail | 2026 |
| Adventure Village Grimsby Limited | Arts & recreation | 2024 |
| Adzen Limited | Real estate | 2024 |
| Aedes Medcare Limited | Health & social care | 2023 |
| AEP Electrical Limited | Construction | 2022 |
| Aevum Data Limited | Professional & scientific | 2015 |
| AFC Grimsby Limited | Hospitality | 2025 |
| Affluent Estates Ltd | Real estate | 2023 |
| Afmet-North East Lincolnshire Community Interest Company | Health & social care | 2017 |
| African Flavour Limited | Wholesale & retail | 2025 |
| African Taste N Bite Restaurant Ltd | Hospitality | 2024 |
| Afterglow Interactive Ltd | Professional & scientific | 2025 |
| AG Anaesthetics Limited | Health & social care | 2018 |
| Against the Grain Education Limited | Education | 2025 |
| Agco Logistics Ltd | Professional & scientific | 2022 |
| AGE UK North East Lincolnshire Trading Company Limited | Health & social care | 2000 |
| Agilaflex Ltd | Real estate | 2010 |
| Agile Group Holdings Limited | Financial services | 2021 |
| Agile Medical Ltd | Manufacturing | 2017 |
| Agincourt Engineering Ltd | Construction | 2020 |
| AGL Engineering Solutions Ltd | Professional & scientific | 2019 |
| AGL Propco Limited | Real estate | 2025 |
| AGM Electrical (Holdings) Limited | Professional & scientific | 2024 |
| AGM Electrical Limited | Construction | 2016 |
| Agnieszka Cleaning Service Limited | Administrative & support | 2023 |
| Agraftrans Ltd | Transport & logistics | 2018 |
| Agri-Analytics (UK) Ltd | Professional & scientific | 2025 |
| Agri-Green Limited | Other services | 2010 |
| AGS Invest Limited | Hospitality | 2024 |
| AGS Invest Properties Ltd | Real estate | 2024 |
| AGS Property (Lincs) Ltd | Real estate | 2018 |
| Agudigbo Group Limited | Health & social care | 2019 |
| AHM Ltd | Construction | 2006 |
| Ahmed Spice Grimsby Ltd | Hospitality | 2022 |
| Ahoh Holdings Limited | Financial services | 2016 |
| Ahvo Ltd | Real estate | 2023 |
| Aida Cafe Bistro Ltd | Hospitality | 2026 |
| Aidan Kershaw Developments Ltd | Construction | 2020 |
| Aidly Limited | Professional & scientific | 2025 |
| Aimee Leigh Hair Ltd | Other services | 2024 |
| Ainslie Mews Management Company Limited | Households | 1989 |
| Aiorta Ltd | Information & communication | 2026 |
| Airkab UK Ltd | Information & communication | 2017 |
| Airpoint Limited | Information & communication | 2003 |
| Aiseed Global Ltd | Information & communication | 2025 |
| Aishwaryam Ltd | Health & social care | 2006 |
| Aisthorpe Estates Ltd | Real estate | 2024 |
| AIT Product Limited | Wholesale & retail | 2024 |
| AJ Cosmetics Ltd | Health & social care | 2024 |
| AJ Furniture Limited | Wholesale & retail | 2023 |
| AJ Serviced Accommodation Limited | Real estate | 2025 |
| Aj's Logistics (KGH) Ltd | Transport & logistics | 2022 |
| Ajazs Medical Services Limited | Health & social care | 2018 |
| AJD Industrial Rope Access Limited | Construction | 2019 |
| AJE Safety Limited | Administrative & support | 2024 |
| Ajes It/Ot Consultancy Limited | Information & communication | 2023 |
| AJH Accountancy Services Limited | Administrative & support | 2007 |
| AJL Wind Services Ltd | Professional & scientific | 2026 |
| AJM Consulting Services Limited | Professional & scientific | 2024 |
| AJO NDT Inspection Ltd | Professional & scientific | 2014 |
| AJS Electrical Inspections Ltd | Construction | 2025 |
| AJS Marketing Limited | Wholesale & retail | 1999 |
| AJS Properties Ltd | Hospitality | 2014 |
| AJS Property Services Limited | Construction | 2011 |
| AJW Ltd | Construction | 2026 |
| AJY Inspections Ltd. | Construction | 2017 |
| AK (IW) Ltd | Manufacturing | 2017 |
| AK HGV Driving and Shunting Services Ltd | Transport & logistics | 2013 |
| Akhenaten (Aten) UK Ltd | Manufacturing | 2013 |
| AKL Electrical Ltd | Construction | 2017 |
| Akpd Comms Ltd | Information & communication | 2021 |
| AL - Madina International Market Ltd | Other services | 2024 |
| AL Hussain Property Limited | Real estate | 2023 |
| AL Madina International Mini Market Ltd | Wholesale & retail | 2025 |
| AL Mais Construction Ltd | Construction | 2026 |
| Alan Browne (Lincolnshire) Limited | Administrative & support | 1998 |
| Alan Cikunov Ltd Ltd | Manufacturing | 2025 |
| Alan Winstanley Ltd | Professional & scientific | 2020 |
| Albemarle Properties (Cleethorpes) Limited | Households | 1999 |
| Albu Trucking Limited | Transport & logistics | 2024 |
| ALC10 Transport Ltd | Transport & logistics | 2025 |
| Alcap Services Ltd | Professional & scientific | 2023 |
| Alchemy - Aesthetic and Wellbeing Ltd | Health & social care | 2023 |
| Aleanto Ltd | Transport & logistics | 2024 |
| Alecsa TM Ltd | Transport & logistics | 2022 |
| Alert Business Information Ltd | Information & communication | 2024 |
| Alex Ghita Ltd | Transport & logistics | 2018 |
| Alex Lautaru Transport Ltd | Transport & logistics | 2025 |
| Alex Scales Ltd | Wholesale & retail | 2016 |
| Alexander Hubbard Ltd | Administrative & support | 2012 |
| Alexander Park at Louth Management Company Limited | Professional & scientific | 2019 |