| Allfit Performance Ltd | Education | 2021 |
| Allfive Ltd | Hospitality | 2025 |
| Allforwin LP | | 2020 |
| Allgoo Business LP | | 2014 |
| Allgoo Corporation LP | | 2012 |
| Alliance Advantage LP | | 2014 |
| Alliance Construction Limited | Construction | 2017 |
| Alliance Creative Limited | Professional & scientific | 2011 |
| Alliance Fortune LP | | 2015 |
| Alliance L.P. | | 2015 |
| Alliance Link Investments LP | | 2016 |
| Alliance Link Operations LP | | 2016 |
| Alliance Media Network LP | | 2017 |
| Alliance Medical Investment LP | | 2013 |
| Alliance Print Ltd | Manufacturing | 2024 |
| Alliance Telecom Ltd | Information & communication | 2010 |
| Alliance Trading L.P. | | 2015 |
| Alliance Triumph LP | | 2013 |
| Alliance Vehicle Solutions Ltd | Wholesale & retail | 2017 |
| Alliance X LP | | 2018 |
| Allianex Holding LP | | 2019 |
| Alliant Trading LP | | 2014 |
| Alliant Universal LP | | 2016 |
| Alliant Ventures LP | | 2015 |
| Alliantex LP | | 2017 |
| Allidan Holding LP | | 2016 |
| Allied & Global L.P. | | 2011 |
| Allied & Westfield L.P. | | 2008 |
| Allied Blenders and Distillers (UK) Limited | Manufacturing | 2022 |
| Allied Commercial Projects L.P. | | 2010 |
| Allied Enteprises Europe L.P. | | 2011 |
| Allied Marine Bunkering LP | | 2015 |
| Allied Marine Holdings LP | | 2018 |
| Allied Services (Europe) L.P. | | 2009 |
| Allied Services International & Co | | 1993 |
| Allied Talent LP | | 2015 |
| Allied Worldwide Investments L.P. | | 2010 |
| Allif 2 Carry Feeder LP | | 2024 |
| Allif 2 Carry LP | | 2022 |
| Allif II SLP I LP | | 2023 |
| Allif II SLP II LP | | 2023 |
| Allif II SLP III LP | | 2023 |
| Allif II SLP IV LP | | 2023 |
| Allif II SLP V LP | | 2026 |
| Allif SLP I LP | | 2019 |
| Allif SLP II LP | | 2019 |
| Allif SLP III LP | | 2019 |
| Alligatorbite Ltd | Information & communication | 2020 |
| Alligin (UK) Ltd | Information & communication | 2013 |
| Alligin Search Ltd | Administrative & support | 2021 |
| Allin Property Holdings Ltd | Real estate | 2026 |
| Allinger LP | | 2016 |
| Allingham & Co (Trustees) Ltd | Administrative & support | 2018 |
| Allingham & Co. (Solicitors) Limited | Administrative & support | 2007 |
| Allisinity Project LP | | 2014 |
| Allison Embedded Systems Ltd | Professional & scientific | 2023 |
| Allison House Hotel Limited | Hospitality | 2015 |
| Allison Investment Ltd | Hospitality | 2018 |
| Allison Investment Property Services Ltd | Real estate | 2024 |
| Allison Property Consultants Ltd | Professional & scientific | 2025 |
| Allison Residential Investments Ltd | Real estate | 2026 |
| Allister Research and Consulting Limited | Administrative & support | 2019 |
| Allmond Developments LP | | 2015 |
| Allns Plumbing & Heating Ltd | Construction | 2024 |
| Allo Management Limited | Transport & logistics | 2017 |
| Allo&Co Limited | Real estate | 2023 |
| Allogroup LP | | 2016 |
| Allotex Import LP | | 2014 |
| Allotex Inter LP | | 2012 |
| Alloway (Scotland) LLP | | 2014 |
| Alloy Steel LP | | 2017 |
| Allp LP | | 2024 |
| Allsee Media Limited | Professional & scientific | 2009 |
| Allser Investments LP | | 2012 |
| Allser Power LP | | 2015 |
| Allsop Rice Ltd | Hospitality | 2022 |
| Allstar Access Ltd | Mining & quarrying | 2020 |
| Allt an Tuir Renewable Energy Park Limited | Energy | 2021 |
| Allt Mhor Limited | Agriculture & fishing | 2026 |
| Allt Works Limited | Wholesale & retail | 2025 |
| Alltrade Alliance LP | | 2015 |
| Allure Beauty Academy Ltd | Other services | 2025 |
| Allure Collective Ltd | Professional & scientific | 2026 |
| Alluvia Industries LP | | 2016 |
| Allvero LP | | 2014 |
| Allvitone Systems LP | | 2013 |
| Allybab Ltd | Wholesale & retail | 2022 |
| Allyburgh Ltd | Wholesale & retail | 2022 |
| Allyou Travel Limited | Administrative & support | 2016 |
| Alma Marketing LP | | 2013 |
| Alma Property Investment Limited | Real estate | 2024 |
| Almack Mezzanine Carry III LP | | 2010 |
| Almack Mezzanine Founder II LP | | 2008 |
| Almack Mezzanine Founder LP | | 2005 |
| Almack Mezzanine Investor III LP | | 2010 |
| Almagro Impex LP | | 2011 |
| Almana Hospitality Ltd | Hospitality | 2026 |
| Almaprom Trading LP | | 2013 |
| Almas Group LP | | 2016 |
| Almendras LP | | 2002 |