| Angling and Mental Health Initiative CIC | Agriculture & fishing | 2024 |
| Angus Neil Limited | Professional & scientific | 2019 |
| Annephen Limited | Arts & recreation | 1999 |
| Antram Pemberton Properties Limited | Real estate | 1988 |
| Aperto-One Ltd | Professional & scientific | 2016 |
| Apex Developments South Ltd | Other services | 2015 |
| Apex S2 Ltd | Real estate | 2024 |
| Apple Dental Practice Limited | Health & social care | 2013 |
| Apple Mint Florist & Finds Ltd | Wholesale & retail | 2025 |
| Applewood Projects Ltd | Construction | 2020 |
| Aprimatic Automation Ltd | Wholesale & retail | 2011 |
| Aquarist Ltd | Information & communication | 2023 |
| Arapaima Properties Limited | Real estate | 2016 |
| Arcade Holdings Ltd | Real estate | 2015 |
| Archer 9 Ltd | Arts & recreation | 2025 |
| Archipelo Limited | Other services | 2012 |
| Archive Apparel Ltd | Wholesale & retail | 2026 |
| Arcono Chipping Norton Ltd | Construction | 2025 |
| Arcono Godalming Ltd | Construction | 2023 |
| Arkadian Systems Ltd | Information & communication | 2011 |
| Arneil Design Studio Limited | Professional & scientific | 2025 |
| Aroma Ventures Ltd | Hospitality | 2020 |
| Arrow FM Limited | Information & communication | 1996 |
| Arrowmont Developments Limited | Administrative & support | 2019 |
| Arrowmont Limited | Real estate | 2018 |
| Arrowprop Limited | Real estate | 2019 |
| Art Shield Ltd | Arts & recreation | 2024 |
| Artemis Operations Ltd | Health & social care | 2010 |
| Arthur & Sons Construction Limited | Construction | 2021 |
| Arundel Hospitality Inn Ltd | Hospitality | 2012 |
| Arundel Residence Inn Ltd | Hospitality | 2016 |
| Asaad Holdings Limited | Financial services | 2019 |
| Ashurst Wood Village Store Ltd | Wholesale & retail | 2023 |
| Aspen Harper Limited | Professional & scientific | 2012 |
| Aston Napier Limited | Professional & scientific | 2017 |
| Atelier ITÄ Ltd | Manufacturing | 2021 |
| Atelier Molinari Ltd | Manufacturing | 2012 |
| Aurora Foil Blocking & Embossing Limited | Manufacturing | 1997 |
| Automotive Machine Services Ltd | Wholesale & retail | 2009 |
| Avon Magnetics Limited | Manufacturing | 1992 |
| AXL Sports Management Limited | Arts & recreation | 2023 |
| Ayan Trading Ltd | Wholesale & retail | 2020 |
| Azure Oak Limited | Education | 2025 |
| B E Civils Recruitment Ltd | Wholesale & retail | 2023 |
| B&H Cosmetic Clinic Limited | Health & social care | 2017 |
| Babysos Ltd | Wholesale & retail | 2026 |
| BAD Boys Chicken Ltd | Hospitality | 2019 |
| BAD Boys Fish & Chips Ltd | Hospitality | 2019 |
| BAD Boys Foods Ltd | Hospitality | 2018 |
| Badlands Guitars Limited | Wholesale & retail | 2003 |
| Balybay Ltd | Real estate | 2013 |
| Bannonanon Limited | Professional & scientific | 2022 |
| Bantii & Monph Limited | Administrative & support | 2023 |
| Barber N Frank Ltd | Other services | 2017 |
| Barefoot 21 Limited | Real estate | 2018 |
| Barksfield Limited | Information & communication | 2017 |
| Barton House Residents Company Limited | Real estate | 2017 |
| Basal Ltd | Real estate | 2017 |
| Basicpause Limited | Construction | 1990 |
| Bastion Music Group Ltd | Information & communication | 2014 |
| Battersea & Bowery Ltd | Professional & scientific | 2020 |
| Batterysense Ltd | Construction | 2026 |
| Baudion Ltd | Other services | 1994 |
| Baymay Ltd | Wholesale & retail | 2012 |
| BE: Dog Limited | Wholesale & retail | 2023 |
| Beacon Consulting UK Limited | Professional & scientific | 2009 |
| Beacon Homes and Lettings Limited | Construction | 2024 |
| Beacon Media Limited | Administrative & support | 2011 |
| Beatdale Consulting Ltd | Financial services | 2015 |
| Beau Brummell Ltd | Other services | 2012 |
| Beau International Ltd | Information & communication | 2024 |
| Beauty Heaven (Sussex) Ltd | Other services | 2014 |
| Beaver Tail Properties Limited | Real estate | 2011 |
| Beckett Analytics Ltd | Information & communication | 2021 |
| Beemi Ltd | Professional & scientific | 2021 |
| Belfast Street Limited | Hospitality | 2014 |
| Belgravia Projects Ltd | Construction | 2021 |
| Bella & Megs Ltd | Hospitality | 2019 |
| BEN Watson Electrical Limited | Construction | 2014 |
| BEN Wong Consulting Ltd | Information & communication | 2024 |
| Bennett's Beers Limited | Hospitality | 2018 |
| Beresford Registrars Limited | Administrative & support | 2004 |
| Bernie's Pet Food Limited | Wholesale & retail | 2025 |
| Bespoke Biscuit Club Ltd | Manufacturing | 2021 |
| Bespoke Dovetail Ltd | Manufacturing | 2021 |
| BFA Qualifications Ltd | Education | 2021 |
| Big Matters Limited | Information & communication | 2004 |
| Big Sand Technologies Limited | Professional & scientific | 2014 |
| Binx Services UK Limited | Professional & scientific | 2019 |
| Biolabskills Limited | Professional & scientific | 2018 |
| Biomimetic Denim Ltd | Professional & scientific | 2024 |
| Birch Base Limited | Manufacturing | 2016 |
| Bistroshoreham Ltd | Hospitality | 2023 |
| BJF Training Ltd | Transport & logistics | 2023 |
| Black Dog Hospitality Services Ltd | Hospitality | 2026 |
| Blackberry Fields Limited | Arts & recreation | 2009 |
| Blackberry Wood Glamping Ltd | Hospitality | 2020 |
| Blackbird Services Limited | Administrative & support | 1945 |
| Blackpepper Creative Ltd | Professional & scientific | 2022 |
| Blackwall Financial Ltd | Professional & scientific | 2026 |