| Alfie's Gainsborough Ltd | Hospitality | 2023 |
| Ali-A Entertainment Ltd | Administrative & support | 2011 |
| Alik Alexander Auctioneers Ltd | Other services | 2024 |
| ALL About Writing Ltd | Other services | 2021 |
| ALL for One Consultancy Ltd | Professional & scientific | 2012 |
| ALL for One Limited | Real estate | 2001 |
| ALL Seeing EYE Security Ltd | Administrative & support | 2024 |
| ALL Things Smell Nice Ltd | Wholesale & retail | 2021 |
| Alliance for Climate Solutions GB C.I.C. | Professional & scientific | 2024 |
| Allmech Fabrication Services Ltd | Other services | 2022 |
| Allnsundry 2018 Limited | Wholesale & retail | 2017 |
| ALLNSUNDRY2018 Rentals Limited | Real estate | 2017 |
| Allwoods Limited | Wholesale & retail | 2004 |
| Alpacas and Friends CIC | Health & social care | 2024 |
| Alpha-Office Lincs Limited | Professional & scientific | 2010 |
| Alphabet Fitness Limited | Professional & scientific | 2009 |
| Alphabet Solutions Limited | Professional & scientific | 2007 |
| Alrock Developments Ltd | Real estate | 2023 |
| Alycidon Aesthetics Ltd | Other services | 2022 |
| Amber Silk Collective Ltd | Wholesale & retail | 2026 |
| Amber Storm Limited | Other services | 2023 |
| Ambien Heating Specialists Ltd | Construction | 2023 |
| Amethorpe Accommodation Limited | Real estate | 2006 |
| Amora Distribution Ltd | Wholesale & retail | 2020 |
| Amward Limited | Energy | 2012 |
| AN Artful Science Limited | Information & communication | 2006 |
| Anderson Brothers Limited | Agriculture & fishing | 2009 |
| Anderson Chestnut Holdings Limited | Professional & scientific | 2018 |
| Anderton Aviation and Adhd Limited | Professional & scientific | 2025 |
| Andrew Harrod Financial Services Ltd | Financial services | 2012 |
| Andrews Civils Estimating Ltd | Professional & scientific | 2018 |
| Angus Education Limited | Education | 2019 |
| Anson Automotive Services Ltd | Other services | 2022 |
| Anthony Theakston Ceramics Limited | Manufacturing | 2016 |
| APC Steel Services Limited | Manufacturing | 2024 |
| Apex Angling Limited | Arts & recreation | 2022 |
| Apex Dental Ltd | Health & social care | 2015 |
| ARK Bespoke Joinery Lincs Ltd | Manufacturing | 2017 |
| ARK Construction Lincs Ltd | Construction | 2014 |
| Aromesse Limited | Manufacturing | 2002 |
| Art Desk Ltd | Wholesale & retail | 2025 |
| AS Equestrian Transport Ltd | Transport & logistics | 2026 |
| Asap Accountants & Business Advisors Limited | Professional & scientific | 2018 |
| Ascot Catering and Event Hire Ltd | Other services | 2008 |
| ASE Media Limited | Other services | 2023 |
| Ashanta Solutions Ltd | Professional & scientific | 2007 |
| Ashby INK Limited | Other services | 2019 |
| Ashley David Barker Ltd | Construction | 2015 |
| Assas Properties Limited | Real estate | 2014 |
| Assured FM Services Ltd | Construction | 2021 |
| Asthingsshouldbe Limited | Professional & scientific | 2013 |
| Astra Antiques Limited | Wholesale & retail | 2013 |
| Aswen Ltd | Other services | 2015 |
| AT the Oak Limited | Wholesale & retail | 2007 |
| Atern Senior Care and Support Limited | Health & social care | 2024 |
| Atropik Ltd | Other services | 2015 |
| Audio Guestbook Ltd | Manufacturing | 2021 |
| Audioholics Limited | Wholesale & retail | 2025 |
| Aulakh a Estate Ltd | Real estate | 2026 |
| Auroris Markets Ltd | Wholesale & retail | 2025 |
| Aurum ER Ltd | Construction | 2026 |
| AV and PC Limited | Information & communication | 2013 |
| Avant Aero Media Ltd | Information & communication | 2023 |
| AWG Clugston Holdings Limited | Financial services | 2023 |
| B & D Installations Limited | Administrative & support | 2014 |
| B D Shepherd Limited | Real estate | 2002 |
| B Kaila Ltd | Real estate | 2025 |
| B L & Sons Carpentry Ltd | Manufacturing | 2021 |
| B L Moulds & SON Limited | Agriculture & fishing | 2012 |
| B S R Motorsport Ltd | Wholesale & retail | 2002 |
| B&D Secretarial Services Limited | Extraterritorial | 2003 |
| Baccostore UK Ltd | Wholesale & retail | 2015 |
| Badger Electrical Installations Ltd | Construction | 2026 |
| BAG of Bones Automotive Ltd | Wholesale & retail | 2025 |
| BAG of Bones Ltd | Arts & recreation | 2020 |
| Bailgate Estates Limited | Households | 2025 |
| BAM Automotive Solutions Ltd | Wholesale & retail | 2020 |
| Bamford Property Investments Ltd | Real estate | 2021 |
| Bandstack Limited | Professional & scientific | 1990 |
| Banjay Limited | Health & social care | 2013 |
| Bankside News Ltd | Wholesale & retail | 2015 |
| Bar Forty One Ltd | Hospitality | 2022 |
| Bargainerz Limited | Wholesale & retail | 2025 |
| Barkworth Reeve Ltd. | Wholesale & retail | 2023 |
| Barrier Healthcare Ltd | Health & social care | 1993 |
| Barvek & Bland Ltd | Other services | 2021 |
| Baseline Barbers Ltd | Other services | 2026 |
| Bashvisuals Expressions Ltd | Manufacturing | 2025 |
| Basu Limited | Health & social care | 2022 |
| Bayswood Homes (Lincoln) Ltd | Construction | 2025 |
| BB Brow Bars Gainsborough Ltd | Other services | 2020 |
| Becketts Health Limited | Arts & recreation | 2024 |
| Beds Direct Warehouse Ltd | Wholesale & retail | 2022 |
| Bedward Services Ltd | Professional & scientific | 2022 |
| Beeby Developments Ltd | Construction | 2019 |
| Beelimitless Ltd | Arts & recreation | 2025 |
| Beeversales Agricultural Components Limited | Wholesale & retail | 1986 |
| Beijing Kitchen DN21 Ltd | Hospitality | 2021 |
| Beijing Kitchen Ltd | Hospitality | 2026 |
| Beldon Jolly Partnership Limited | Professional & scientific | 2015 |