| Azeitona Holdings Limited | London | 2025 |
| Azelis UK Holdings Limited | Runcorn | 2002 |
| Azembel Limited | Cardiff | 2019 |
| Azen Holdings Ltd | London | 2024 |
| Azenor Holdings Limited | London | 2021 |
| Azer Ltd | London | 2025 |
| Azeria Limited | London | 2015 |
| Azets Debt Solutions Limited | Renfrew | 2017 |
| Azets Financial Planning Limited | London | 2010 |
| Azets Inspire Ventures & Investments Ltd | London | 2015 |
| Azets LA Holding Limited | Newcastle Upon Tyne | 2021 |
| Azets LA Limited | Newcastle Upon Tyne | 2002 |
| Azets Milne Craig Holdings Limited | Renfrew | 2016 |
| Azets Wealth Management Limited | Newcastle Upon Tyne | 2006 |
| Azfin Limited | Cardiff | 2024 |
| Azgard Limited | Cardiff | 2019 |
| Azguard Holdings Limited | Basildon | 2022 |
| AZH Holdings Limited | Ilford | 2024 |
| Azhar Holdings Ltd | London | 2026 |
| Azhary Limited | Potters Bar | 2015 |
| AZI Mortgages Ltd | Milton Keynes | 2024 |
| Azidan Ltd | London | 2022 |
| Azienda DI Casalattico Limited | Belfast | 2026 |
| Azima Holdings Ltd | Batley | 2025 |
| Azima Ltd | London | 2023 |
| Azimi Holding Limited | Chatham | 2026 |
| Azimo Holding Ltd | London | 2021 |
| Azimo Ltd | London | 2012 |
| Azimut UK Holdings Limited | London | 2021 |
| Azini 3 (FP) Limited | Edinburgh | 2013 |
| Azini 3 (General Partner) Limited | London | 2000 |
| Azini Limited | London | 2011 |
| Azini Nominees Limited | London | 2007 |
| Aziorah Holdings Ltd | London | 2025 |
| Azip Holdings Limited | Dewsbury | 2018 |
| Azire Group Limited | Manchester | 2015 |
| Aziz & Ayub Group Holdings Ltd | Birmingham | 2026 |
| Aziz & Sons Investments Ltd | Peterborough | 2025 |
| Aziz Group Holdings & Investments Ltd | Peterborough | 2025 |
| Aziz Group Holdings Limited | London | 2022 |
| Aziz Venture Capital Ltd | Nottingham | 2025 |
| Aziza Holdings Limited | Sheffield | 2023 |
| Azizi Exchange Limited | London | 2019 |
| Azizon Ltd | Burnley | 2025 |
| AZJ Solutions Ltd | Seven Kings | 2010 |
| Azkon Ltd | Hemel Hempstead | 2020 |
| Azmat Holdings Ltd | Birmingham | 2024 |
| Aznah Limited | London | 2019 |
| Azola Holdings Limited | London | 2025 |
| Azona Group Limited | Hereford | 2025 |
| Azone Holdings Limited | London | 2015 |
| Azora Group Limited | Greenhithe | 2025 |
| Azoria Capital (5) Limited | Cheshire | 2024 |
| Azoria Capital (6) Limited | Crewe | 2024 |
| Azoth Group Ltd | Norwich | 2024 |
| Azoth Investments Ltd | Norwich | 2022 |
| Azoura Ltd | London | 2025 |
| AZP Holdings Limited | Bolton | 2026 |
| Azpi Ltd | Shenley | 2020 |
| Azquo Holdings Limited | Ludlow | 2017 |
| AZR Capital Ltd | London | 2012 |
| AZR Group Ltd | Stoke-On-Trent | 2026 |
| Azraam Limited | Solihull | 2024 |
| Azraco Ltd | Hayes | 2009 |
| Azraya Invest Limited | London | 2024 |
| Azre Corporate Member Limited | London | 2024 |
| Azreal Ltd | Rochford | 2024 |
| AZS Equity Group Ltd | Manchester | 2025 |
| AZS Finance Ltd | Enfield | 2021 |
| AZS House Limited | London | 2016 |
| AZS Trading Ltd | Solihull | 2026 |
| AZS Ventures Limited | Manchester | 2025 |
| Aztec Alliance Limited | London | 2001 |
| Aztec EOT Trustees Limited | Chesterfield | 2021 |
| Aztec Financial Services (UK) Limited | Fareham | 2006 |
| Aztec Fire Doors & Frames Holdings Limited | Liverpool | 2024 |
| Aztec Funding Ltd | Gosforth | 2020 |
| Aztec Gold Limited | Swansea | 2009 |
| Aztec Holdco Ltd | Walsall | 2024 |
| Aztec Holdings (Europe) Limited | Whiteley, Fareham | 2015 |
| Aztec Industrial Holdings Limited | Ashton-In-Makerfield | 1999 |
| Aztec Interiors Group Limited | Liverpool | 2024 |
| Aztec Interiors Holdings Ltd | Liverpool | 2021 |
| Aztec Nominees (UK) Limited | Whiteley, Fareham | 2016 |
| Aztec Oils Holdings Limited | Chesterfield | 2021 |
| Aztec Presentations Holdings Limited | Leeds | 2026 |
| Aztec Real Estate Investments Limited | 3 Dorset Rise | 1995 |
| Aztec UK Europe Holdings Limited | Fareham | 2024 |
| Aztecs Holdings Ltd | Gerrards Cross | 2025 |
| Aztek Management Ltd | Bolton | 2023 |
| Aztek Services Holdings Ltd | Isleham, Ely | 2020 |
| AZU Holdings Ltd | Ilford | 2026 |
| Azuk Limited | Harrow | 2018 |
| Azukari Group Limited | Melton Mowbray | 2015 |
| Azul Bidco Limited | London | 2024 |
| Azul Holdco Limited | London | 2024 |
| Azul Holdings Limited | London | 2025 |
| Azul Horizonts Ltd | London | 2020 |
| Azule Energy Finance PLC | London | 2024 |
| Azule Energy Holdings Limited | London | 2022 |