| A & T Utilities Limited | Construction | 2019 |
| A - Z Design Solutions Limited | Administrative & support | 2014 |
| A 1 Metal Recycling Limited | Water & waste | 2010 |
| A Acklam (Consulting) Ltd | Financial services | 2015 |
| A B Cartridges Limited | Wholesale & retail | 2006 |
| A B Wells Projects Ltd | Construction | 2018 |
| A B Williams Limited | Health & social care | 2009 |
| A C & K L Twell Ltd | Wholesale & retail | 2008 |
| A C Developments (Lincoln) Limited | Construction | 2017 |
| A Collective Living Ltd | Real estate | 2026 |
| A Darakhshan Ltd | Health & social care | 2014 |
| A E Hedges Ltd | Construction | 2017 |
| A F Construction Lincoln Ltd | Manufacturing | 2024 |
| A Fogg Ltd | Construction | 2025 |
| A G Khan Limited | Health & social care | 2012 |
| A Gale Tiling Ltd | Construction | 2008 |
| A H Bell & SON Limited | Agriculture & fishing | 2009 |
| A H Civil Engineering Ltd | Wholesale & retail | 2006 |
| A H D S (Lincs) Ltd | Construction | 2021 |
| A H M Locums Limited | Health & social care | 2022 |
| A Hafez Ltd | Real estate | 2025 |
| A Ibrahim MED Ltd | Health & social care | 2021 |
| A J C E Ltd. | Construction | 2003 |
| A J Engineering UK Ltd | Construction | 2004 |
| A L COX & Sons Limited | Agriculture & fishing | 2006 |
| A M Building & Construction Limited | Construction | 2008 |
| A M Vamplew & SON Ltd | Construction | 2022 |
| A P Alarms (Lincoln) Ltd | Administrative & support | 2013 |
| A P Lawson Engineering Ltd | Professional & scientific | 2024 |
| A P Pathway Ltd | Education | 2012 |
| A P Safe Transport Limited | Other services | 2009 |
| A R Brumby Ltd | Wholesale & retail | 2021 |
| A R Pearson & SON (Grain) Limited | Wholesale & retail | 2008 |
| A S Chahal Ltd | Wholesale & retail | 2024 |
| A Sahota Ltd | Health & social care | 2009 |
| A T Build Ltd | Construction | 2021 |
| A Touch of Beauty Limited | Health & social care | 2019 |
| A W Nattrass Ltd | Construction | 2011 |
| A&B G Limited | Transport & logistics | 2024 |
| A&D Auto Services Ltd | Wholesale & retail | 2026 |
| A&D Freshpaint Limited | Construction | 2025 |
| A&H Electrical (Lincoln) Limited | Construction | 2016 |
| A&J Smith Properties Limited | Real estate | 2017 |
| A&K Cars Ltd | Wholesale & retail | 2026 |
| A&K Technical Services Ltd | Professional & scientific | 2024 |
| A&T Geoservices Limited | Professional & scientific | 2006 |
| A&T Real Estate Limited | Real estate | 2021 |
| A&V Bland Developments Ltd | Real estate | 2025 |
| A&V Bland Ltd | Construction | 2022 |
| A-Z D&F Holdings Limited | Financial services | 2023 |
| A-Z Furniture Solutions Limited | Manufacturing | 2015 |
| A-Z Major Projects Limited | Manufacturing | 2024 |
| A. Chamberlain Combination Contracting Ltd. | Construction | 2011 |
| A. Green Engineering (Lincoln) Limited | Manufacturing | 1982 |
| A. Howe and Sons Limited | Real estate | 1972 |
| A. J. Burkitt Limited | Construction | 2013 |
| A. Moor & Sons Limited | Agriculture & fishing | 2008 |
| A. P. Jenkins and Associates Limited | Financial services | 2013 |
| A. W. Nevile Limited | Wholesale & retail | 1976 |
| A.A. Masternak Transport Ltd | Transport & logistics | 2013 |
| A.Barham Builders Ltd | Construction | 2018 |
| A.C.E. Installations & Maintenance Limited | Construction | 2020 |
| A.C.Gilbert & Son,Limited | Agriculture & fishing | 1913 |
| A.J.R. Taylor (Construction) Limited | Professional & scientific | 1970 |
| A.M.P. Security (Lincs) Ltd | Administrative & support | 2014 |
| A.N Electrician Ltd | Manufacturing | 2025 |
| A.R.T. Agricultural Drone Services Ltd | Agriculture & fishing | 2026 |
| A.T. Horgan Joinery Ltd | Construction | 2003 |
| A.W. Curtis and Sons Limited | Real estate | 1930 |
| A.Walker Electrical Services Ltd | Construction | 2021 |
| A.Waugh Inspections Ltd | Financial services | 2017 |
| A1 Building Contractors Ltd | Construction | 2022 |
| A1 Homes (Lincs) Limited | Administrative & support | 2019 |
| A1 Metal Recycling (2014) Limited | Water & waste | 2014 |
| A1 Turf and Landscapes Ltd | Administrative & support | 2014 |
| A14 Energy Limited | Financial services | 2023 |
| A2B Cars Ltd | Transport & logistics | 2017 |
| A2B Premium Movers Ltd | Transport & logistics | 2026 |
| A2B Primary Care Service Limited | Health & social care | 2018 |
| AA Education Ltd | Education | 2017 |
| AA Roofing (Lincoln) Limited | Construction | 2026 |
| AA Taxi Services Ltd | Transport & logistics | 2026 |
| AAA Medical Consultancy Ltd | Health & social care | 2021 |
| AAA Scaffolding ( Lincoln ) Limited | Construction | 2008 |
| Aaaaa Limited | Information & communication | 2023 |
| AAC Surveyors Limited | Professional & scientific | 2008 |
| Aadinath Private Limited | Real estate | 2025 |
| Aaiz Holdings Limited | Financial services | 2025 |
| Aakos Holdings Ltd | Real estate | 2021 |
| Aakos Limited | Professional & scientific | 2019 |
| Aamir and Sons Ltd | Hospitality | 2024 |
| Aardvark Electrical Services Ltd | Construction | 2026 |
| Aarna Properties Holdings Ltd | Real estate | 2025 |
| Aaron Architectural Limited | Professional & scientific | 2023 |
| Aaron D Property Ltd | Real estate | 2024 |
| Aaron Dale Roger Dreikluft Limited | Extraterritorial | 2024 |
| Aaron Davenport Ltd | Construction | 2023 |
| Aaron Plumbing Limited | Construction | 2017 |
| Aavad Property Ltd | Real estate | 2021 |
| AB & Thee Limited | Other services | 2021 |