| Albenhouse Limited | Hospitality | 2011 |
| Alberro Properties Ltd | Real estate | 2024 |
| Albi Car Repairs Ltd | Wholesale & retail | 2022 |
| Albion Court (Norwich) Management Company Limited | Households | 2020 |
| Albion Cromer Limited | Hospitality | 2018 |
| Albion Games Ltd | Hospitality | 2022 |
| Albion Lifting Equipment Inspections Limited | Construction | 2016 |
| Albion Manufacturing Ltd | Manufacturing | 1961 |
| Albion Properties Norfolk Ltd | Construction | 2024 |
| Albion Property Solutions Limited | Construction | 2019 |
| Alby Asset Management Ltd | Real estate | 2021 |
| Alby CC Ltd | Real estate | 2013 |
| Alby Developments Limited | Real estate | 2021 |
| Alby Estates Ltd | Real estate | 2015 |
| Alby Estates Maintenance Limited | Households | 2019 |
| Alby Estates Management Ltd | Households | 2018 |
| ALC Safety Services Limited | Professional & scientific | 2016 |
| Alcala INK Ltd | Other services | 2020 |
| Alcedo Ripple Ltd | Professional & scientific | 2020 |
| Alcester 50 Limited | Hospitality | 2022 |
| Alchemy Brands Ltd | Manufacturing | 2024 |
| Alchemy for the EYE Ltd | Arts & recreation | 2011 |
| Alchemy Home Improvements Ltd | Construction | 2024 |
| Alchemy Investments LLP | | 2019 |
| Alchemy Property Investments (2018) Ltd | Real estate | 2018 |
| Alchemy Property Services Ltd | Real estate | 2021 |
| Alcock Lees Partnership Limited | Other services | 2007 |
| Alcon Builders Ltd | Construction | 2025 |
| Alcor Property Limited | Real estate | 2020 |
| Alcosa Properties Limited | Real estate | 2006 |
| Aldborough Farms Limited | Agriculture & fishing | 1975 |
| Aldborough Hall Estates Limited | Real estate | 1943 |
| Aldcroft Group Ltd | Construction | 2024 |
| Aldeburgh Food and Drink Festival C.I.C. | Arts & recreation | 2008 |
| Aldeburgh Lodge Management Company Limited | Households | 1980 |
| Aldemir-Down Ltd | Professional & scientific | 2023 |
| Alden Developments Ltd | Administrative & support | 1998 |
| Alden Properties Limited | Real estate | 2024 |
| Aldens Transmissions Ltd | Wholesale & retail | 2020 |
| Aldercarr BED and Breakfast Limited | Hospitality | 2020 |
| Alderfen Yacht and Marine Surveys Ltd | Extraterritorial | 2021 |
| Alderford Barns Limited | Hospitality | 2025 |
| Alderheath Ltd | Financial services | 2023 |
| Alderman Mcgee Gardens Management Company Ltd | Administrative & support | 2020 |
| Aldhaus Residential Limited | Real estate | 2026 |
| Aldis Close Management Company Limited | Households | 2011 |
| Aldous Cleaning Services Ltd | Administrative & support | 2022 |
| Aldous Plumbing & Heating Ltd | Construction | 2026 |
| Aldridge Bishop Limited | Wholesale & retail | 2018 |
| Ale-Flix Fasteners and Logistics Limited | Wholesale & retail | 2024 |
| Aleator Limited | Professional & scientific | 2016 |
| Aleks Jewellers Limited | Other services | 2010 |
| Aleksievi Ltd | Hospitality | 2024 |
| Ales Consulting Ltd | Professional & scientific | 2024 |
| Alev Limited | Hospitality | 2025 |
| Alex Badulescu Transport Ltd | Transport & logistics | 2017 |
| Alex Brown Groundworks Limited | Construction | 2017 |
| Alex Chef Ltd | Hospitality | 2024 |
| Alex Freight Link Ltd | Transport & logistics | 2026 |
| Alex Holman Ltd | Arts & recreation | 2012 |
| Alex Humphreys Investment Ltd | Real estate | 2020 |
| Alex LE MEZ Ltd | Manufacturing | 2022 |
| Alex Robinson Limited | Professional & scientific | 2011 |
| Alex Scotton Web Development Ltd | Information & communication | 2019 |
| Alexander & Co Residential Limited | Real estate | 2012 |
| Alexander Gordon Smith Ltd | Information & communication | 2018 |
| Alexander IP Limited | Financial services | 2016 |
| Alexander JBM Limited | Other services | 2016 |
| Alexander Management Limited | Real estate | 2016 |
| Alexander Premier Limited | Real estate | 2016 |
| Alexander Residential Properties Ltd | Real estate | 2021 |
| Alexandra EVE Estates Ltd | Real estate | 2026 |
| Alexandra House (Cromer) Limited | Real estate | 1988 |
| Alexandra House RTM Company Limited | Households | 2010 |
| Alexandrite Recruitment Limited | Administrative & support | 2017 |
| Alexandru Health Ltd | Health & social care | 2013 |
| Alexandrucare Ltd | Health & social care | 2022 |
| Alexas Trans Ltd | Transport & logistics | 2023 |
| Alexea Ltd | Information & communication | 2007 |
| Alexea Property Ltd | Real estate | 2024 |
| Alexol Limited | Real estate | 1997 |
| Alexol One Limited | Financial services | 2005 |
| Alfalfa Bloat Limited | Arts & recreation | 2013 |
| Alfarisi Ltd | Information & communication | 2025 |
| Alfashop Holdings Limited | Wholesale & retail | 2013 |
| Alfashop Limited | Wholesale & retail | 1982 |
| Alfha U.K. Limited | Construction | 2007 |
| Alfie Cooks Ltd | Manufacturing | 2023 |
| Alfie Stone Mechanic Ltd | Professional & scientific | 2026 |
| Alfred Charles Homes (Ickburgh) Limited | Construction | 2019 |
| Alfred Charles Homes (Martham) Limited | Construction | 2019 |
| Alfred Charles Homes (NE Norwich) Ltd | Administrative & support | 2010 |
| Alfred House (Darwin Court) Residents Management Company Limited | Households | 2016 |
| ALG Holdings (Norfolk) Limited | Real estate | 2023 |
| ALG Social Work Ltd | Health & social care | 2020 |
| Alger Limited | Financial services | 2020 |
| ALI Family Caterers Ltd | Hospitality | 2017 |
| ALI Family Plus Caterers Ltd | Hospitality | 2019 |
| ALI Investigations Limited | Health & social care | 2019 |
| ALI News Agent Norwich Ltd | Wholesale & retail | 2022 |