| Allied Holdings North West Ltd | Wigan | 2025 |
| Allied Holdings Scotland Limited | Glasgow | 2020 |
| Allied Infinity Consultants Limited | Epping | 2019 |
| Allied Insulators Group Limited | Tunstall | 2016 |
| Allied Insurance Services Limited | Wigan | 2001 |
| Allied International Investment Services Ltd | Altrincham | 2021 |
| Allied Minds PLC | London | 2014 |
| Allied Mortgage Services Limited | Coventry | 2016 |
| Allied Pacific Holdings Ltd | Cannock | 2021 |
| Allied People Group Limited | Hoddesdon | 2021 |
| Allied Properties Holdings Limited | Hull | 2023 |
| Allied RE Corporation Ltd | Kington | 2015 |
| Allied RE Group Broker Ltd | Doncaster | 2021 |
| Allied Systems Ltd | Sutton | 2005 |
| Allied Universal Limited | Colchester | 1996 |
| Allied Ventura Limited | Worsley | 2001 |
| Allied Ventures Corporations (UK) Holdings Ltd | London | 2018 |
| Allied Wessex Westinsure Limited | Swindon | 2002 |
| Allied Westminster (Insurance Services) Limited | Wetherby | 1989 |
| Alligare Holdings (UK) Limited | Cardiff | 2020 |
| Alligate Limited | Ilford | 2020 |
| Allikas Limited | Aylesbury | 2016 |
| Allimac Underwriting Limited | Grantham | 2009 |
| Allin Fans Ltd | Uckfield | 2025 |
| Allincrypto Ltd | London | 2024 |
| Allinea Corporate Limited | Altrincham | 2017 |
| Allingham Holdings Ltd | Cookstown | 2017 |
| Allington Investments Ltd | Taunton | 2021 |
| Allinsons Agricultural Services Ltd | Peterborough | 2025 |
| Allison & Sons Group Ltd | Rutherglen | 2024 |
| Allison Homes and HGP Developments Limited | Peterborough | 2025 |
| Allison Homes Holdings Limited | Peterborough | 2025 |
| Allison Homes JV Holdings Limited | Peterborough | 2025 |
| Allison Mortgage Services Ltd | Towcester | 2023 |
| Allison Protection Specialists Ltd | Preston | 2018 |
| Allison UK Holdings Limited | Basildon | 2020 |
| Allisons Financial Planning Limited | St Helens | 2004 |
| Allitsen Holdings Ltd | London | 2026 |
| Allium FP Limited | Melksham | 2025 |
| Allium Helmsley Group Ltd | York | 2024 |
| Allium Holdings Limited | Prescot | 2023 |
| Allium Lending Group Limited | Blackpool | 2016 |
| Allium Money Limited | Blackpool | 2017 |
| Allium UK Buyer Ltd. | London | 2023 |
| Allium UK Holding Limited | London | 2022 |
| Alljay Holdings Limited | Aylesford | 2006 |
| Allkitchens Ltd | Norwich | 2022 |
| Alll Financial Services Limited | Basingstoke | 2017 |
| Allman Investments Limited | Crewe | 2015 |
| Allmand-Smith Group Limited | Congleton | 2025 |
| Allmanhall Group Limited | Corsham | 2019 |
| Allmarket Group Holdings Ltd | Belfast | 2022 |
| Allmet Group Limited | Fenton | 2023 |
| Allnatt Group Limited | Midhurst | 2004 |
| Allneeds Investments Ltd | Hertfordshire | 2026 |
| Allnutts About Finance Ltd | Newton Abbot | 2021 |
| Allocean Maritime Investments Ltd | London | 2011 |
| Allocean Maritime Ltd | London | 2012 |
| Allocron Investments Ltd | Poole | 2026 |
| Allonby + Partners Ltd | London | 2016 |
| Allos Capital Holdings Limited | London | 2026 |
| Allos Capital Management Limited | London | 2026 |
| Allosaurus Ltd | Reading | 2024 |
| Allott Target Limited | Darlington | 2023 |
| Alloway Financial Limited | Ayr | 2016 |
| Alloy Finance Limited | London | 2014 |
| Alloygator Group Limited | Redditch | 2021 |
| Allpaq Holdings Ltd | Widnes | 2018 |
| Allparts (Holdings) Limited | Exmouth | 2013 |
| Allpay Financial Services Limited | Hereford | 2024 |
| Allpay Group Limited | Hereford | 2024 |
| Allpay Holdings Limited | Hereford | 2019 |
| Allpay Limited | Whitestone Hereford | 1994 |
| Allpay Payment Solutions Limited | Hereford | 2024 |
| Allplastics Holdings Ltd | Hitchin | 2021 |
| Allport Holdings Ltd | Wimborne | 2025 |
| Allpro Holding UK Limited | Stoke On Trent | 2025 |
| Allpropertyclaims Bidco Ltd | London | 2024 |
| Allpropertyclaims Limited | London | 2011 |
| Allquest Holdings Ltd | Bristol | 2025 |
| Allreid Holdings Limited | Bury St. Edmunds | 2026 |
| Allsafe Holdings Limited | Oxford | 2018 |
| Allsaved Holdings Limited | Billingshurst | 2023 |
| Allseals UK Limited | Norwich | 2015 |
| Allsfar International Limited | Watford | 2025 |
| Allshore Associates Limited | St. Austell | 2017 |
| Allsop & Allsop Holdings Limited | Leicester | 2018 |
| Allsop Kane and Allen Limited | Brighton | 2012 |
| Allsop Property Holdings Limited | Derby | 2023 |
| Allsopp & Allsopp Ltd | Ashington | 2023 |
| Allsopp & Bamford Holdings Ltd | Derbyshire | 2024 |
| Allsopp Financial Management Limited | Birmingham | 2005 |
| Allsopp Holdco Limited | London | 2024 |
| Allsopp Holdings Collective Limited | Taunton | 2026 |
| Allsopp Holdings Limited | London | 2025 |
| Allsopp Kanabar Limited | Leicester | 2014 |
| Allsopp Solutions Limited | Godalming | 2023 |
| Allspares (Auto) Investments Limited | Bridgend | 2025 |
| Allspeeds Engineering Solutions Limited | Blackburn | 2018 |
| Allspeeds Group Limited | Blackburn | 2024 |