| Aramco GAS UK LP Ltd. | London | 2025 |
| Aramco GAS UK Ltd. | London | 2025 |
| Aramco Trading Limited | London | 2019 |
| Aramco Ventures Limited | London | 2014 |
| Aramima Capital Limited | London | 2011 |
| Aramis Bidco Limited | London | 2022 |
| Aramis Midco 1 Limited | London | 2022 |
| Aramis Midco 2 Limited | London | 2022 |
| Aramis Midco 3 Limited | London | 2022 |
| Aramis Solutions Limited | Bromley | 2025 |
| Aramis Topco Limited | London | 2022 |
| Aramoor Limited | Newbury | 2025 |
| Aran Energy Holdings Limited | Stevenage | 2017 |
| Aranby Ltd | Kilmarnock | 2021 |
| Aranci Advisors Ltd. | London | 2018 |
| Aranga Services Ltd | Wigan | 2023 |
| Aranmore Holdings Limited | Co. Down | 2023 |
| Aranrose Properties Limited | London | 1999 |
| Aranvale Care Group Ltd | Huddersfield | 2025 |
| Arap Consulting Services Ltd | London | 2022 |
| Araras Management Ltd | London | 2024 |
| Aras Partners Limited | London | 2025 |
| Arash Consultancy Ltd | Bristol | 2012 |
| Arashid Limited | London | 2012 |
| Arasio Capital Limited | London | 2020 |
| Aratellus Group Limited | Aberdeen | 2023 |
| Aratellus Midco Limited | Manchester | 2024 |
| Araton Limited | London | 2020 |
| Arauco Ventures Limited | London | 2022 |
| Arauco Wood Limited | London | 2022 |
| Arav Capital Limited | Pinner | 2015 |
| Aravem Ltd | Brighton | 2022 |
| Aravis Capital Limited | London | 2015 |
| Aravis Financial Ltd | London | 2026 |
| Aravis Investments Ltd | London | 2026 |
| Araxa Capital Ltd | Ongar | 2013 |
| Araya Holdings Limited | London | 2025 |
| Araya SIE Ventures Ltd | London | 2025 |
| Araya SPV Nominees Limited | London | 2026 |
| Araya Ventures Ltd | London | 2024 |
| Arazon FX Ltd | Ruislip, | 2026 |
| ARB (NW) Limited | Liverpool | 2020 |
| ARB 10 Ltd | London | 2016 |
| ARB Asset Capital Ltd | Halstead | 2026 |
| ARB Asset Management (UK) Ltd | Stockbridge | 2025 |
| ARB Automotive Group Ltd | Lewes | 2024 |
| ARB Brokers Holdings Limited | Southport | 2017 |
| ARB Holdings (South Wales) Limited | Llanelli | 2024 |
| ARB Holdings Derby Ltd | Heanor | 2025 |
| ARB International Limited | Southport | 1989 |
| ARB Investments Ltd | Halstead | 2023 |
| ARB Venture Group Ltd | Leeds | 2025 |
| Arba Holdings Ltd | Woodford Green | 2019 |
| Arbaniya Ltd. | Hitchin | 2012 |
| Arbatel Capital Limited | Lytham St. Annes | 2010 |
| Arbe Solutions Ltd | Cheam | 2019 |
| Arbeia Corporation Limited | Boldon Colliery | 2017 |
| Arbeia Finance Ltd | East Boldon | 2026 |
| Arbela Capital Limited | London | 2013 |
| Arbela Limited | London | 2009 |
| Arbery Partners Limited | London | 2026 |
| Arbex UK Limited | Leeds | 2024 |
| Arbio UK Ltd. | London | 2022 |
| Arbion Holdings Ltd. | London | 2022 |
| Arbion Limited | London | 2009 |
| Arbis Holdings Limited | Southampton | 2020 |
| Arbit Trading Ltd | London | 2025 |
| Arbitan | Leeds | 2018 |
| Arbiter Holding Ltd | Harrow | 2026 |
| Arbiter Risk Corps Limited | Aylesford | 2023 |
| Arbites Solutions Ltd | London | 2025 |
| Arbitrage Capital Limited | London | 2013 |
| Arbitrage Global Limited | Liverpool | 2024 |
| Arbitrage Holdings (Scotland) Ltd | Motherwell | 2026 |
| Arbj Investments Ltd | London | 2022 |
| Arblaster & Clarke Holdings Limited | Cheltenham | 2014 |
| Arblease Limited | Northampton | 2021 |
| Arbnix Limited | Cardiff | 2026 |
| Arbo Capital Ltd | London | 2018 |
| Arbois Holdings Ltd | London | 2021 |
| Arbol INS Services (UK) Ltd | Gloucester | 2023 |
| Arbor Aurea Ltd | Waltham Abbey | 2026 |
| Arbor Division Group Ltd | Seaham | 2025 |
| Arbor Enterprises Ltd | Bristol | 2026 |
| Arbor Group (SWF) Limited | Ingatestone | 2020 |
| Arbor Holdings Ltd | Ingatestone | 2016 |
| Arbor Limited | Bolton | 2002 |
| Arbor Research & Trading UK Limited | London | 1999 |
| Arbor Vitae (UK) Limited | Castleford | 2013 |
| Arborcon Ltd | Gateshead | 2016 |
| Arborcure Holdings Limited | Plymouth | 2021 |
| Arboretum Capital Holdings Ltd | Edinburgh | 2025 |
| Arboretum Enterprises Group Ltd | Derby | 2019 |
| Arboretum Financial Planning Limited | Darrington | 2024 |
| Arboretum Holdings Limited | Uckfield | 2017 |
| Arboreum Pensions Limited | London | 2025 |
| Arborfield Wealth Limited | Arborfield | 2022 |
| Arborvitae Holdings Ltd | Crosby | 2025 |
| Arbour Bay Capital Ltd | London | 2023 |
| Arbour Court Property Company Limited | Stanmore | 2014 |