| Alcam Precision Engineering Limited | Ayr | 2014 |
| Alcamrow Engineering Ltd | Southport | 2023 |
| Alcan Colwick Limited | | 1971 |
| Alcan Farms Limited | London | 1972 |
| Alcan High Duty Extrusions Limited | Buckinghamshire | 1913 |
| Alcan Swinton Limited | | 1934 |
| Alcane Ltd | London | 2026 |
| Alcantara Consultancy Services Limited | London | 2011 |
| Alcantara Evans Architects Ltd. | Putney | 2012 |
| Alcante Ltd | London | 2025 |
| Alcap Services Ltd | Grimsby | 2023 |
| Alcapa Ltd | London | 2022 |
| Alcapi Limited | Waterlooville | 2019 |
| Alcara Management Ltd | London | 2025 |
| Alcarus Risk Solutions Ltd | York | 2025 |
| Alcaso Services Ltd | North Shields | 2022 |
| Alcaston Limited | Borough | 2014 |
| Alcatechnic Aviation Ltd | London | 2022 |
| Alcatraz Engineering Ltd | Dunfermline | 2020 |
| Alcayna Research Limited | London | 2022 |
| Alcazaba Group Limited | Alfreton | 2015 |
| Alcazaba Ltd | Manchester | 2023 |
| Alcazar Energy Limited | London | 2016 |
| Alcazar Investment Management Limited | London | 2012 |
| Alcc Limited | Waterlooville | 2020 |
| Alce Martwell Ltd | Gravesend | 2022 |
| Alcea Consulting Limited | Bromsgrove | 2017 |
| Alcedin Consulting Ltd | Braintree | 2024 |
| Alcedine Ecology Ltd | Telford | 2024 |
| Alcedo Associates Ltd | Milton Keynes | 2019 |
| Alcedo Conservation Ltd | Wiltshire, Bradford On Avon | 2022 |
| Alcedo Consult Limited | Warrington | 2022 |
| Alcedo Consulting Ltd | Marlow | 2023 |
| Alcedo Ecology Limited | Bedford | 2020 |
| Alcedo Finance Limited | London | 1990 |
| Alcedo International Limited | Ipswich | 2023 |
| Alcedo Ltd | Eastbourne | 2026 |
| Alcedo Ripple Ltd | Norwich | 2020 |
| Alcema Developments Limited | Droitwich | 2023 |
| Alcema Projects Limited | Droitwich | 2023 |
| Alcema Services Limited | Droitwich | 2023 |
| Alcemi DOS Limited | London | 2023 |
| Alcemi Services Limited | London | 2023 |
| Alcemi Southern & Central Europe Limited | Shipston-On-Stour | 2026 |
| Alcera Group Ltd | Barnet | 2021 |
| Alces Holdings Limited | London | 2026 |
| Alces Limited | Bicester | 2014 |
| Alces Management Services Ltd | Liverpool | 2015 |
| Alcester Architectural Design Limited | Alcester | 2024 |
| Alcester Capricorn | Birmingham | 1960 |
| Alcester Coach House Ltd | Alcester | 2013 |
| Alcester EP1 Limited | Birmingham | 2000 |
| Alcester Glassware Limited | Pershore | 1995 |
| Alcester Number 1 Limited | Birmingham | 1915 |
| Alcester Projects Limited | London | 2015 |
| Alcestis Limited | Newbury | 2006 |
| Alceus Biosciences Ltd | London | 2024 |
| Alcham Consulting Limited | London | 2009 |
| Alchami Accounting Ltd | Bradford | 2023 |
| Alchamis Ltd | Colchester | 2021 |
| Alchar Limited | London | 2007 |
| Alche-Me Business Solutions Ltd | Carmarthen | 2026 |
| Alchem Holdings Limited | Surrey | 1970 |
| Alchemab Therapeutics Ltd | London | 2019 |
| Alchemate Limited | Newton Abbot | 2025 |
| Alcheme Advisors Limited | Farnham | 2012 |
| Alchemed Bioscience Consulting Ltd | Farnham | 2020 |
| Alchemedia Solutions Ltd | London | 2020 |
| Alchemette Properties Ltd | Whitchurch | 2012 |
| Alchemi Online Ltd | London | 2025 |
| Alchemi Renovations Limited | London | 2023 |
| Alchemia Advisory Ltd | London | 2023 |
| Alchemia Ltd | Spalding | 2025 |
| Alchemical Holdings Ltd | London | 2024 |
| Alchemicvibe Ltd | Leeds | 2021 |
| Alchemie IP Limited | Leeds | 2007 |
| Alchemilla Architects Limited | Chard | 2009 |
| Alchemin Consulting Ltd | London | 2019 |
| Alchemis Holdings Limited | London | 2005 |
| Alchemis Limited | London | 2017 |
| Alchemis.Me Ltd | London | 2023 |
| Alchemist Consultants Limited | Sunderland | 2017 |
| Alchemist Consulting Group Ltd | Harrogate | 2019 |
| Alchemist Consulting Limited | London | 2007 |
| Alchemist DB Limited | Borehamwood | 2016 |
| Alchemist Designs Ltd | Banbury | 2018 |
| Alchemist Media London Limited | London | 2019 |
| Alchemist Palace Ltd | Cardiff | 2021 |
| Alchemist Solutions Limited | Swansea | 2019 |
| Alchemist Ventures and Consultancy Services Ltd | Leeds | 2017 |
| Alchemist Worldwide Limited | London | 2007 |
| Alchemist's Interior Design Limited | Bedford | 2007 |
| Alchemista Enterprises Limited | London | 2010 |
| Alchemistic Mind Ltd | London | 2022 |
| Alchemix Limited | Cambridge | 2020 |
| Alchemy & I (IP) Ltd | Berkhamsted | 2024 |
| Alchemy Accountancy Limited | Preston | 2018 |
| Alchemy Accounting Ltd | Polegate | 2009 |
| Alchemy Advance Ltd | Burton-On-Trent | 2011 |
| Alchemy Advisers Limited | London | 2025 |