| 10 LEE Street Louth Freehold Ltd | Households | 2023 |
| 11 Mercer ROW Management Company Ltd | Households | 2026 |
| 121 Websites Limited | Information & communication | 2023 |
| 125/127 ST Peters Road Management Limited | Other services | 2006 |
| 14 the Beach Management Company Limited | Households | 1997 |
| 140-142 Eastgate Management Company Limited | Households | 2016 |
| 2 Oaks Property Company Limited | Households | 2016 |
| 23 & 23A Stanley Avenue Limited | Households | 2025 |
| 28 Pixels Ltd | Information & communication | 2022 |
| 4 Ways Pizza & Kebabs Limited | Hospitality | 2018 |
| 404MFX Limited | Professional & scientific | 2024 |
| 4X4 Products Limited | Financial services | 2020 |
| 601 Club Italian Bistro Ltd | Hospitality | 2021 |
| 61 Upgate Limited | Households | 2019 |
| 72 Cleethorpes Beach Ltd | Households | 2020 |
| 8TEN Racing Ltd | Arts & recreation | 2025 |
| 949 Investments Ltd | Financial services | 2026 |
| A & S Properties (Louth) Limited | Real estate | 2019 |
| A & V Louth Ltd | Real estate | 2026 |
| A 2 C MOT Testing Station Limited | Wholesale & retail | 2025 |
| A Dales & Sons (Louth) Limited | Wholesale & retail | 2003 |
| A G Burridge Ltd | Wholesale & retail | 2012 |
| A Smith Painting & Decorating Limited | Construction | 2023 |
| A to Z Construction (UK) Limited | Construction | 2009 |
| A&S Global Goods Ltd | Wholesale & retail | 2024 |
| A. Rotherham Electrical Ltd | Construction | 2020 |
| A.C. Jacklin Logistics Limited | Transport & logistics | 2004 |
| A.P. Services (Louth) Limited | Construction | 2003 |
| A.W. Smith & Sons Limited | Agriculture & fishing | 1954 |
| AB Transport Ltd | Transport & logistics | 2019 |
| Abacus Physiotherapy Ltd | Health & social care | 2010 |
| ABI Stubbs Next Generation Investments Ltd | Financial services | 2024 |
| Academy Way Management Company Limited | Households | 2024 |
| ACB Machinery & Servicing Ltd | Wholesale & retail | 2021 |
| Acmagic Ltd | Arts & recreation | 2026 |
| Activa Properties Limited | Real estate | 1998 |
| AD Astra Equipment Sales Ltd. | Wholesale & retail | 2003 |
| Adam Barrett Carpentry & Joinery Services Limited | Construction | 2013 |
| Addicted to TRI Ltd | Education | 2021 |
| Adinvenio Multimedia Limited | Professional & scientific | 2004 |
| Adrenewables Ltd | Construction | 2022 |
| Adrian Gorst Services Limited | Wholesale & retail | 2018 |
| Adrian Shinn Property Management Co Ltd | Real estate | 2023 |
| Adrip Plumbing Limited | Construction | 2013 |
| AE PGD Property Holdings Ltd | Real estate | 2025 |
| Aesthetics by Megan Ltd | Health & social care | 2019 |
| AG & DH Developments Limited | Construction | 2022 |
| AG Image Limited | Professional & scientific | 2006 |
| AG Injury & Rehabilitation Limited | Health & social care | 2018 |
| Agriteck Laboratories Limited | Professional & scientific | 1998 |
| Ahmetaris Ltd | Hospitality | 2025 |
| AHN Electrical Ltd | Construction | 2022 |
| AIM Electrical Solutions Ltd | Other services | 2023 |
| Airborne Armour Limited | Professional & scientific | 2019 |
| Airsense UK Ltd | Professional & scientific | 2021 |
| Airstrip Holdings Ltd | Manufacturing | 1998 |
| Alastair Meiklejon Ltd | Wholesale & retail | 2019 |
| Alchemy Pictures Limited | Extraterritorial | 2003 |
| Alderson Asset Management Limited | Financial services | 2022 |
| Aldrich Agricultural Limited | Agriculture & fishing | 2025 |
| Alford Trading Company Limited | Wholesale & retail | 2023 |
| Alison Coggan Design Limited | Professional & scientific | 2017 |
| Alive Tuning Limited | Wholesale & retail | 2006 |
| ALL Stars Arena CIC | Arts & recreation | 2025 |
| Allied Growers Limited | Agriculture & fishing | 2014 |
| Allinson Print Limited | Manufacturing | 1992 |
| Alpacas at the Meadows Ltd | Agriculture & fishing | 2023 |
| Amara Packaging Ltd | Wholesale & retail | 2019 |
| Amelia Wood Way Management Company Ltd | Households | 2019 |
| Amesdale Limited | Real estate | 1999 |
| AMG Commercials Limited | Wholesale & retail | 2020 |
| Amorai Solutions Ltd | Information & communication | 2025 |
| AMY Morwenna Grove Limited | Extraterritorial | 2024 |
| AMY Stubbs Next Generation Investments Ltd | Financial services | 2024 |
| Andrew Johnstone Limited | Agriculture & fishing | 1982 |
| Andy Bray Agencies Limited | Wholesale & retail | 2014 |
| Andy Godbold Consulting Limited | Professional & scientific | 2023 |
| Anvil Services Limited | Construction | 2015 |
| Apex Cameras Ltd | Information & communication | 2018 |
| APS Process Ltd | Professional & scientific | 2013 |
| Aqua Lemna Group International Ltd | Agriculture & fishing | 2024 |
| Aqua Lemna Group Ltd | Agriculture & fishing | 2023 |
| Aquavita (Catering) Limited | Hospitality | 2012 |
| Aquella Limited | Wholesale & retail | 2009 |
| Aquotiq Ltd | Information & communication | 2026 |
| AR & D Laughton Limited | Agriculture & fishing | 2015 |
| ARC Training Solutions Ltd | Professional & scientific | 2023 |
| Architectural Imaging Solutions Ltd | Professional & scientific | 2024 |
| Ardesen Limited | Hospitality | 2008 |
| ARG Plumbing and Heating Ltd | Construction | 2012 |
| Arkz Consultancy Limited | Professional & scientific | 2025 |
| Armstrong and Fraser Funeral Directors Ltd | Other services | 2023 |
| Arteli Properties Limited | Real estate | 2016 |
| Artist Panels Ltd | Manufacturing | 2026 |
| Ascott Project Management Limited | Administrative & support | 2006 |
| Asha Indian Restaurant ( Louth) Ltd | Hospitality | 2024 |
| Asha Indian Restaurant Ltd | Hospitality | 2018 |
| Ashbourne Hotel Limited | Hospitality | 2001 |
| Asher's Developments Limited | Real estate | 2025 |
| Asset Health Products Ltd | Manufacturing | 2022 |