| A1 Electrics@Work Limited | Energy | 2014 |
| A1 Engine Recon Ltd | Wholesale & retail | 2026 |
| A1 Ergotech Limited | Information & communication | 2016 |
| A1 Escapes Limited | Administrative & support | 2025 |
| A1 Estate Services Ltd | Real estate | 2024 |
| A1 Estates Private Ltd | Real estate | 2011 |
| A1 Event, Exhibition, Window & Office Cleaners Ltd. | Administrative & support | 1958 |
| A1 Express Alteration Tailors Limited | Other services | 2002 |
| A1 Facades Ltd | Wholesale & retail | 2022 |
| A1 Facilities Services Limited | Administrative & support | 2016 |
| A1 Family Tree Care Ltd | Administrative & support | 2025 |
| A1 Financial Strategy Limited | Administrative & support | 2017 |
| A1 Fitness London Ltd | Arts & recreation | 2015 |
| A1 Food Services Ltd | Hospitality | 2022 |
| A1 Forever Solutions Limited | Construction | 2012 |
| A1 FOX Limited | Hospitality | 2022 |
| A1 Freight and Consultancy Ltd | Transport & logistics | 2026 |
| A1 Gasco Heating Ltd | Construction | 2022 |
| A1 Global Consultants Ltd | Professional & scientific | 2025 |
| A1 Grand Prix Productions Limited | Arts & recreation | 2005 |
| A1 Gujarat Junction Ltd | Hospitality | 2025 |
| A1 Halal Meat Poultry and Fish Ltd | Wholesale & retail | 2024 |
| A1 Hall Ltd | Hospitality | 2026 |
| A1 HI TEC Roofing and Building Services Ltd | Construction | 2025 |
| A1 Home Improvements Gateshead Ltd | Construction | 2025 |
| A1 Homes ( UK ) Limited | Real estate | 2020 |
| A1 Housing CIC | Real estate | 2018 |
| A1 Housing Services Ltd | Real estate | 2014 |
| A1 Insight Consulting Limited | Administrative & support | 2017 |
| A1 Invest Ltd | Financial services | 2012 |
| A1 Italian Restaurant Ltd | Hospitality | 2023 |
| A1 Jewellery Limited | Other services | 2013 |
| A1 Kebabish Grill Limited | Real estate | 2005 |
| A1 Khan Store Limited | Wholesale & retail | 2019 |
| A1 Laboratory Supplies Limited | Manufacturing | 2003 |
| A1 Labour Recruitment Limited | Administrative & support | 2019 |
| A1 Labour Solutions Limited | Administrative & support | 2023 |
| A1 Landlord Repairs Ltd | Other services | 2025 |
| A1 Legal Consultants Limited | Professional & scientific | 2019 |
| A1 Legends Limited | Hospitality | 2026 |
| A1 License Limited | Administrative & support | 2024 |
| A1 Lift Installation Ltd | Manufacturing | 2021 |
| A1 Logic Ltd | Wholesale & retail | 2020 |
| A1 Logistics & Couriers Ltd | Transport & logistics | 2025 |
| A1 London Carpentry Limited | Manufacturing | 2021 |
| A1 London Ltd | Other services | 2019 |
| A1 Luxury Enterprises Ltd | Other services | 2015 |
| A1 Luxury Homes and Properties Limited | Construction | 2025 |
| A1 Maintenance Solutions Ltd | Real estate | 2026 |
| A1 Majestic Tree Care Ltd | Administrative & support | 2025 |
| A1 Malik Builders Ltd | Construction | 2023 |
| A1 Management Consulting Limited | Real estate | 2015 |
| A1 Marketplace Ltd | Wholesale & retail | 2024 |
| A1 Marquees Limited | Administrative & support | 2026 |
| A1 Media Capital Ltd | Financial services | 2019 |
| A1 Media Limited | Information & communication | 2012 |
| A1 Minibuses Ltd | Transport & logistics | 2025 |
| A1 Minicab Limited | Transport & logistics | 2012 |
| A1 MOK Limited | Professional & scientific | 2021 |
| A1 Motorbike Zone Limited | Wholesale & retail | 2025 |
| A1 Moves Ltd | Transport & logistics | 2011 |
| A1 Moving Services Ltd | Transport & logistics | 2022 |
| A1 Nails Bar Ltd | Other services | 2014 |
| A1 Natural Ltd | Wholesale & retail | 2023 |
| A1 Network Exchange Limited | Information & communication | 2021 |
| A1 Network Solutions Ltd | Information & communication | 2014 |
| A1 New Construction Ltd | Construction | 2023 |
| A1 Noor Limited | Wholesale & retail | 2024 |
| A1 North Internet Cafe Ltd | Information & communication | 2019 |
| A1 Omni Channel Ltd | Other services | 2024 |
| A1 Parking Partners LP | | 2021 |
| A1 Pattern Ltd | Wholesale & retail | 2024 |
| A1 Petra Minerals Ltd | Financial services | 2012 |
| A1 Pharma Ltd | Wholesale & retail | 2020 |
| A1 PIT Stop Limited | Wholesale & retail | 1999 |
| A1 Pizza Limited | Hospitality | 2009 |
| A1 Planning Portal Limited | Professional & scientific | 2017 |
| A1 Positive Home Solutions Limited | Administrative & support | 2015 |
| A1 Prestige Motors Ltd | Wholesale & retail | 2026 |
| A1 Product Ltd | Wholesale & retail | 2024 |
| A1 Professional Builders Ltd | Construction | 2011 |
| A1 Professional Cleaners Limited | Administrative & support | 2021 |
| A1 Professionals Ltd | Administrative & support | 2021 |
| A1 Property & Investment Group Ltd | Construction | 2026 |
| A1 Property Developments Limited | Real estate | 2004 |
| A1 Quality Fitouts Ltd | Construction | 2018 |
| A1 Real Estate Holdings Ltd | Households | 2025 |
| A1 Real Estates Limited | Real estate | 2019 |
| A1 Recovery Services Ltd | Transport & logistics | 2025 |
| A1 Recruitment Ltd | Administrative & support | 2026 |
| A1 Recruitment Services Ltd | Professional & scientific | 2025 |
| A1 Removals Ltd | Transport & logistics | 2025 |
| A1 Reports Ltd | Professional & scientific | 2020 |
| A1 Residence Ltd | Real estate | 2023 |
| A1 Retail Trading Ltd | Wholesale & retail | 2022 |
| A1 Revenue Ltd | Information & communication | 2012 |
| A1 Security Services Ltd | Administrative & support | 2016 |
| A1 Security Solutions Ltd | Financial services | 2023 |
| A1 Self Storage Limited | Administrative & support | 1990 |
| A1 Smart Ltd | Wholesale & retail | 2016 |