| 3WAY Finance Company Limited | Lancashire | 2003 |
| 3WEST Strawberry Hill Ltd | Exeter | 2021 |
| 3WM Holdings Limited | Nottingham | 2020 |
| 3XD Limited | London | 2006 |
| 3XZ Holding Ltd | London | 2025 |
| 3Y Group Limited | Belfast | 2020 |
| 3Z Money Ltd | Poole | 2025 |
| 4 Ashes Property Holdings Limited | Halesowen | 2021 |
| 4 Beta Investment Ltd | Luton | 2019 |
| 4 Cities Investment Ltd | Bolton | 2024 |
| 4 Everything Limited | Paignton | 2025 |
| 4 Eyes Capital Limited | London | 2015 |
| 4 Financial Planning Ltd | Bristol | 2019 |
| 4 Futures Phase 1 (Refico) Limited | London | 2022 |
| 4 Futures Phase 2 (Refico) Limited | London | 2022 |
| 4 Laing Limited | Loughborough | 2023 |
| 4 Life Direct International Management Service Limited | London | 2012 |
| 4 One Seven Holdings Limited | Cheltenham | 2024 |
| 4 Partners Ltd | Bedford | 2021 |
| 4 Partners Newco Ltd | Bedford | 2021 |
| 4 Partners Subco Ltd | Bedford | 2021 |
| 4 Penta Court Limited | Borehamwood | 2018 |
| 4 Pillars Financial Planning Ltd | Salisbury | 2018 |
| 4 Pines Property Investments Ltd | Newton Abbot | 2020 |
| 4 Quarter Communication Ltd | Wimborne | 2015 |
| 4 Rivers Services Limited | Elstead, Godalming | 2016 |
| 4 Seasons Worx Holding Limited | Ross-On-Wye | 2022 |
| 4 Shires Asset Management Ltd | Gillingham | 2011 |
| 4 Spheres Limited | Cardiff | 2023 |
| 4 Sports Group Ltd | Liverpool | 2026 |
| 4 Square Advice Limited | Pewsey | 2001 |
| 4 Square Finance Limited | Braintree | 2019 |
| 4 Star Catering Limited | Aberdeen | 2024 |
| 4 Summit Holdings Limited | Romford | 2022 |
| 4 Supernovas Ltd | Blackpool | 2022 |
| 4 Sure Investment Ltd | Croydon | 2020 |
| 4 Unite Ltd | Saltaire | 2024 |
| 4 Ward Finance Ltd | Rotherham | 2019 |
| 4 Winsley Street Ltd | London | 2024 |
| 404 Resource NOT Found Ltd | Twickenham | 2014 |
| 404 Ventures Ltd | Ashford | 2024 |
| 40FR Ltd | Manchester | 2019 |
| 41 Albemarle Limited | London | 2025 |
| 41 KEW Foot Road Limited | London | 2017 |
| 41 VC Limited | Grimsby | 2024 |
| 4119 Holdings Ltd | London | 2025 |
| 415 Wealth Ltd | Wantage | 2025 |
| 41CIRG Future Ltd | London | 2025 |
| 41UG Holdco 1 Ltd | Hemel Hempstead | 2024 |
| 41UG Residential Investments Ltd | Hemel Hempstead | 2024 |
| 42 Capital Limited | London | 2024 |
| 42 Fordwych Road Freehold Limited | London | 2024 |
| 42 HQ Limited | Huddersfield | 2021 |
| 42 International Limited | Witney | 2021 |
| 42 KM Limited | Hillsborough | 2018 |
| 42 Legal Capital Limited | London | 2022 |
| 42 Risk Management Limited | London | 2024 |
| 42 Wealth Management Ltd | London | 2015 |
| 420 Investments Limited | Watford | 2024 |
| 42MARKETS Group Holding Limited | Winchester | 2021 |
| 43 Holdings Ltd | Morecambe | 2025 |
| 43 Newbridge Road Ltd | Bath | 2026 |
| 432 Capital Holdings Ltd | Wrexham | 2025 |
| 44 Benefit Solutions Limited | Brentwood | 2012 |
| 44 Black Diamonds Ltd | Gloucester | 2019 |
| 44 Financial Limited | Melton Mowbray | 2010 |
| 44 Holdings Limited | Thorp Arch | 2020 |
| 4429 Limited | Wallsend | 2026 |
| 448 Limited | London | 2015 |
| 45 Endymion Road Limited | London | 2016 |
| 45 Financial Limited | Darlington | 2022 |
| 45 GR Ltd | Exeter | 2015 |
| 45 RPT Limited | Solihull | 2019 |
| 450 Argyle (Glasgow) Limited | Kidlington | 2023 |
| 451 Group Limited | Birmingham | 2023 |
| 451F Limited | Bradford | 2015 |
| 4521 Ltd | Manchester | 2025 |
| 46 Holdings Ltd | London | 2025 |
| 46 Munster Road Ltd | London | 2021 |
| 463A Lordship Lane Limited | London | 2022 |
| 465ISH Ltd | London | 2019 |
| 465NEO Limited | London | 2016 |
| 465NEOCV Ltd | London | 2019 |
| 465SI Limited | London | 2012 |
| 46PW Ltd | Enfield | 2024 |
| 46UM Limited | London | 2025 |
| 47 Camp Road Ltd | St. Albans | 2010 |
| 47B Holdings Limited | East Kilbride | 2025 |
| 47HOLDINGS Limited | St. Ives | 2026 |
| 47TRADING Limited | St. Ives | 2026 |
| 48 Coney Street Holdco Limited | London | 2025 |
| 484 Group Limited | Bolton | 2010 |
| 4879 Castello Ltd | London | 2015 |
| 49 Degrees North Ltd | Salisbury | 2022 |
| 49 Woodland Road (Freehold) Limited | Bishop'S Stortford | 2019 |
| 49'S Group Limited | Milton Keynes | 2021 |
| 497 DYL Holdings Ltd | Leicester | 2026 |
| 497 SZ Ltd | Birmingham | 2015 |
| 4:44 Capital Ltd | Hambrook | 2024 |
| 4A Care Limited | Derby | 2023 |