| ASHLEC1 Limited | Construction | 2023 |
| Ashleigh Associates (Wakefield) Limited | Professional & scientific | 2005 |
| Ashleigh Barclay Consultants Limited | Professional & scientific | 2018 |
| Ashley Atkins Ltd | Health & social care | 2022 |
| Ashley Kate HR Limited | Administrative & support | 2001 |
| Ashley Lane Access Limited | Extraterritorial | 2021 |
| Ashley Law Sheffield West Limited | Financial services | 2013 |
| Ashley N Kelley Holdings Ltd | Other services | 2024 |
| Ashley Rogers Limited | Wholesale & retail | 2001 |
| Ashley Travel Limited | Transport & logistics | 1996 |
| Ashlock Estates Ltd | Construction | 2026 |
| Ashmead Property Rentals Limited | Administrative & support | 2003 |
| Ashmin Ltd | Health & social care | 2015 |
| Ashmore Lasprilla Limited | Real estate | 2026 |
| Asholeybay Technologies Ltd | Wholesale & retail | 2025 |
| Ashtec Services Ltd | Manufacturing | 2007 |
| Ashton Green Holdings Ltd | Financial services | 2021 |
| Ashton Industries Limited | Professional & scientific | 2021 |
| Ashton Security Systems Ltd | Administrative & support | 2011 |
| Ashton White Joinery Limited | Manufacturing | 2012 |
| Ashtonco Consultants Ltd | Professional & scientific | 2023 |
| Ashtown Lane LLP | | 2016 |
| Ashurst Grove Health Care Limited | Health & social care | 2025 |
| Ashurst Joinery & Construction Ltd | Construction | 2012 |
| Ashurst Sheet Metals Limited | Manufacturing | 1994 |
| Ashventured Ltd | Administrative & support | 2025 |
| Ashwood Mechanical Ltd | Professional & scientific | 2025 |
| Ashwood Properties Services Ltd | Real estate | 2026 |
| Ashworth Maintenance Solutions Ltd | Professional & scientific | 2024 |
| ASI Technology Limited | Information & communication | 2012 |
| Asia Combo 1970 Limited | Hospitality | 2019 |
| Asia Dining Group Ltd | Hospitality | 2021 |
| Asia-Pacific Foundation Limited | Administrative & support | 2010 |
| Asian Elegance by Z Ltd | Wholesale & retail | 2026 |
| ASIANTREASURE2021(UK) Ltd | Hospitality | 2021 |
| Asim and Sons Limited | Real estate | 2019 |
| Asjad Foods Limited | Hospitality | 2020 |
| Asjc Enterprises Ltd | Real estate | 2017 |
| Asjek Recruitment Ltd | Administrative & support | 2023 |
| ASK Complete Building Services Limited | Construction | 2004 |
| ASK Developments UK Ltd Ltd | Construction | 2023 |
| ASK2BUILD Ltd | Construction | 2018 |
| ASK4 (Buyco) Limited | Education | 2017 |
| ASK4 (MIDCO1) Limited | Education | 2017 |
| ASK4 (MIDCO2) Limited | Education | 2017 |
| ASK4 Austria Limited | Information & communication | 2019 |
| ASK4 Business Limited | Information & communication | 1998 |
| ASK4 Data Centres Limited | Information & communication | 2012 |
| ASK4 Europe Limited | Information & communication | 2015 |
| ASK4 France Limited | Information & communication | 2020 |
| ASK4 Germany Limited | Information & communication | 2015 |
| ASK4 Integrated Services Limited | Extraterritorial | 2019 |
| ASK4 Ireland Limited | Information & communication | 2015 |
| ASK4 Italy Limited | Information & communication | 2020 |
| ASK4 Limited | Information & communication | 2000 |
| ASK4 Netherlands Limited | Information & communication | 2019 |
| ASK4 Nordics Limited | Information & communication | 2019 |
| ASK4 Poland Limited | Information & communication | 2017 |
| ASK4 Portugal Limited | Information & communication | 2017 |
| ASK4 Solutions Limited | Information & communication | 2006 |
| ASK4 Spain Limited | Information & communication | 2015 |
| ASK4 Trustees Limited | Professional & scientific | 2015 |
| Askale Logistics Ltd | Transport & logistics | 2024 |
| Asker Properties Ltd | Real estate | 2020 |
| Askers Studio Ltd | Wholesale & retail | 2022 |
| Askham Builders Ltd | Construction | 2022 |
| Asklipeios Ltd | Health & social care | 2025 |
| Askwith Alliance Ltd | Real estate | 2011 |
| ASL Plumbing &Property Projects Limited | Manufacturing | 2024 |
| Aslam Brothers Limited | Construction | 2024 |
| Aslam Properties Ltd | Real estate | 2014 |
| Aslan Baloch Ltd | Wholesale & retail | 2026 |
| Aslan MAY Limited | Hospitality | 2024 |
| Asli Properties Limited | Transport & logistics | 2020 |
| Asmara Prop Limited | Real estate | 2021 |
| Asmet Group Limited | Financial services | 2019 |
| ASO Rock Foods Limited | Wholesale & retail | 2026 |
| ASO Total Management Limited | Professional & scientific | 2018 |
| Asoc Holding Limited | Financial services | 2024 |
| Asoto Powergen Solutions Ltd | Professional & scientific | 2020 |
| ASP Executive Search Limited | Professional & scientific | 2011 |
| Aspect Building & Joinery Ltd | Construction | 2019 |
| Aspect Developments (SY) Ltd | Manufacturing | 2019 |
| Aspect Energy Management Limited | Manufacturing | 2008 |
| Aspect Evolutions Limited | Real estate | 2021 |
| Aspect Invest Ltd | Real estate | 2007 |
| Aspect Ratio Software Limited | Information & communication | 2025 |
| Aspect Ratio Studio Ltd | Real estate | 2026 |
| Aspect Training Limited | Education | 2000 |
| Aspects Landscape Construction Limited | Administrative & support | 2021 |
| Aspengold Limited | Real estate | 1983 |
| Asphalt Plant Solutions Limited | Construction | 2022 |
| Asphalt UK Limited | Construction | 2000 |
| Asphaltic Roofing Supplies Limited | Extraterritorial | 1987 |
| Aspirational Brands Limited | Hospitality | 2021 |
| Aspire Community Enterprise (Sheffield) Limited | Education | 2001 |
| Aspire Creative LLP | | 2005 |
| Aspire Education Hub 2 Ltd | Education | 2025 |
| Aspire Education Hub Ltd | Education | 2025 |
| Aspire Enterprice Ltd | Wholesale & retail | 2025 |