| ANA Remedials Ltd | Construction | 2015 |
| Anchem Laboratories Limited | Professional & scientific | 2003 |
| Anderson Building & Maintenance Ltd | Construction | 2025 |
| Anderson Rentals Limited | Real estate | 2020 |
| Andrea Casting Limited | Administrative & support | 2012 |
| Andrew John Curnow (AJC) Consultancy Limited | Professional & scientific | 2022 |
| Angel Asset Capital Ltd | Financial services | 2019 |
| Anna Zamczyk Skin Clinic Ltd | Health & social care | 2020 |
| Antipest Ltd | Administrative & support | 2024 |
| Anushree Properties Ltd | Real estate | 2022 |
| Anve Clothing Ltd | Wholesale & retail | 2023 |
| Anyway UP Bingo Ltd | Arts & recreation | 2024 |
| APC International Ltd | Real estate | 2003 |
| Apex Firewood Ltd | Wholesale & retail | 2021 |
| Apex Grounds Maintenance Limited | Administrative & support | 2017 |
| Apollo Hire & Sales Ltd | Construction | 2026 |
| Applefray Limited | Construction | 2019 |
| Appoint Direct Limited | Financial services | 2012 |
| Aqua Brite Cleaning Ltd | Other services | 2013 |
| Aquila Services Limited | Administrative & support | 2024 |
| Arbagri Ltd | Agriculture & fishing | 2024 |
| Archford Estates Ltd | Real estate | 2026 |
| Arctos Racing Ltd | Wholesale & retail | 2026 |
| AREA51 Group Limited | Financial services | 2022 |
| Arek Transport Ltd | Transport & logistics | 2025 |
| Armsyl Ltd | Wholesale & retail | 2025 |
| Aropa Care Group Ltd | Education | 2018 |
| Art Construct Ltd | Construction | 2007 |
| Art Deliveries Limited | Transport & logistics | 2024 |
| Artic Store Ltd | Wholesale & retail | 2025 |
| Asassets Inc Limited | Financial services | 2026 |
| Ascendecor Limited | Wholesale & retail | 2026 |
| Ascragga Rooch Infrastructure Projects Ltd | Construction | 2019 |
| Ashdan Limited | Real estate | 2022 |
| Aslp Property Solutions UK Ltd | Financial services | 2021 |
| Aspa Joanna 2 Ltd | Transport & logistics | 2021 |
| Assistmost Enterprises Limited | Administrative & support | 1993 |
| AT Home Meds Limited | Health & social care | 2025 |
| Athletic Property Holdings Limited | Real estate | 2016 |
| ATL Africa Tracking Ltd | Information & communication | 2022 |
| Atlantic International Sales Ltd | Wholesale & retail | 2014 |
| Atlas Football Fellowship Limited | Education | 2026 |
| Atlas Partnerships Limited | Professional & scientific | 2026 |
| ATT Engineering Ltd | Manufacturing | 2010 |
| Aura the Witches Store Cupboard Ltd | Wholesale & retail | 2021 |
| Aurora Barn Limited | Agriculture & fishing | 2025 |
| Aurum Jets Ltd | Wholesale & retail | 2022 |
| Aviation Composite Engineering Services Ltd | Manufacturing | 2014 |
| Away From Home Stays Ltd | Hospitality | 2020 |
| Awen Aesthetics Ltd | Health & social care | 2026 |
| Axado Limited | Transport & logistics | 2025 |
| B Kelleher Concrete Structures Limited | Construction | 2022 |
| B&V Family Ltd | Wholesale & retail | 2024 |
| B.L.A Property Services Ltd | Administrative & support | 2022 |
| B.R.I.G.H.T Options Community Interest Company | Administrative & support | 2024 |
| B.V.M. Consulting Ltd | Professional & scientific | 2023 |
| Bafra Ltd | Hospitality | 2019 |
| Bagha Ltd | Hospitality | 2020 |
| Bailey Thomas Shutters Limited | Construction | 2024 |
| Bailey's Blinds Neath Limited | Construction | 2021 |
| Bailey's Fish and Chip Bar Ltd | Hospitality | 2009 |
| Baileys Blinds Swansea Limited | Construction | 2025 |
| Balance Responsible Living Ltd | Wholesale & retail | 2019 |
| Banwen Miners Hunt Limited | Arts & recreation | 2021 |
| Banwen Rugby Football and Social Club Limited | Arts & recreation | 2022 |
| Bar & Catering Supplies Limited | Wholesale & retail | 2007 |
| Bar Propshafts Ltd | Manufacturing | 2025 |
| Barbed Wear Limited | Wholesale & retail | 2026 |
| Bargainbobs Limited | Wholesale & retail | 2025 |
| Barkingham Park Ltd | Other services | 2015 |
| Barkle Ltd | Wholesale & retail | 2021 |
| Baroc Gifts Ltd | Wholesale & retail | 2024 |
| Barons Court Development Limited | Construction | 2014 |
| Bascule Settlements Limited | Financial services | 2025 |
| Basin Cafe Ltd | Hospitality | 2025 |
| Basset Hound Blades CYF. | Wholesale & retail | 2025 |
| Bater Electrical & Building Services Ltd | Construction | 2018 |
| BE Life Community CIC | Education | 2025 |
| Beaufins Ltd | Real estate | 2019 |
| Beauty Vision Ltd | Other services | 2018 |
| Beck Hill Ltd | Professional & scientific | 2022 |
| Beckett Lane Limited | Professional & scientific | 2014 |
| Becks Bitz Ltd | Wholesale & retail | 2025 |
| BEE 1 ( Bees) Ltd | Other services | 2019 |
| BEE 1 (Community) CIC | Professional & scientific | 2019 |
| Beeudesign Ltd | Information & communication | 2026 |
| Beguiling Brickwork Limited | Construction | 2019 |
| BELLA10 Limited | Administrative & support | 2021 |
| BEN Woods Property Specialist Ltd | Real estate | 2019 |
| Bengal Bites Ltd | Hospitality | 2026 |
| Beta Telecoms Ltd | Information & communication | 2026 |
| Better OFF TED Ltd | Wholesale & retail | 2021 |
| Bevan Communications Ltd | Information & communication | 2025 |
| BFR Catering Limited | Hospitality | 2026 |
| BG Engineering Systems Ltd | Extraterritorial | 2020 |
| Bidder & Homes Ltd | Real estate | 2024 |
| Big Daddy's Doggy Daycare Ltd | Other services | 2024 |
| Big Day Pro Live Ltd | Arts & recreation | 2023 |
| BIM Media Ltd | Manufacturing | 2023 |
| Biophilia Equilibrium CIC | Hospitality | 2025 |