| Ashtree Accountants Limited | Professional & scientific | 2011 |
| Ashtree Audit Ltd | Professional & scientific | 2010 |
| Ashtree Court LLP | | 2008 |
| Ashwell Homes (Mansfield) Ltd | Construction | 2018 |
| Ashwells Decorators Limited | Construction | 2009 |
| Ashwood Finishings Ltd | Construction | 2014 |
| Ashwood Plumbing & GAS Services Ltd | Construction | 2012 |
| Ashwood Training and Consultancy Ltd | Administrative & support | 2019 |
| Ashworth-Watts Properties Limited | Real estate | 2026 |
| Ashworth-Watts Psychology Limited | Health & social care | 2024 |
| ASI Management Ltd | Wholesale & retail | 2022 |
| Asian African Minimarket Ltd | Wholesale & retail | 2019 |
| Asian Flavaz 1 Ltd | Hospitality | 2024 |
| Asian Flavaz Nottingham Limited | Hospitality | 2017 |
| Asian Womens Project Limited | Education | 1996 |
| Asiana Developments Limited | Construction | 2020 |
| Asiana Foods Limited | Wholesale & retail | 2017 |
| Asiana Management Services LLP | | 2009 |
| Asii Medical Limited | Health & social care | 2015 |
| Asima Healthcare Ltd | Health & social care | 2021 |
| Asims Chemist Ltd | Wholesale & retail | 2016 |
| Asirè Clothing Limited | Wholesale & retail | 2025 |
| ASJ Beauty Ltd | Professional & scientific | 2023 |
| ASJ Capital Partners Limited | Real estate | 2025 |
| ASJ Property Holdings Ltd | Real estate | 2023 |
| ASK Andy Limited | Wholesale & retail | 2026 |
| ASK Construction (Nottingham) Limited | Extraterritorial | 2013 |
| ASK for Angela CIC | Public administration | 2023 |
| ASK House Services Limited | Wholesale & retail | 2024 |
| ASK Motor Group Ltd | Wholesale & retail | 2026 |
| ASK Promotions Ltd | Professional & scientific | 2024 |
| Askay Ltd | Other services | 2014 |
| Aske Properties Limited | Real estate | 2003 |
| Asking Better Questions Ltd | Professional & scientific | 2017 |
| Askknowhow Limited | Education | 2023 |
| ASL (UK) Ltd | Information & communication | 1997 |
| ASL Healthcare Limited | Health & social care | 2015 |
| Aslam Estate (Notts) Ltd | Real estate | 2019 |
| Aslam Family Estates Ltd | Real estate | 2025 |
| Aslan Pizza Ltd | Hospitality | 2019 |
| Aslanora Kitchen Ltd | Hospitality | 2025 |
| Aslockton Tennis Club Limited | Arts & recreation | 2022 |
| ASM (F) Limited | Real estate | 2020 |
| ASM Drywall Ltd | Construction | 2017 |
| Asmat Ltd | Health & social care | 2013 |
| Asmhh Limited | Health & social care | 2020 |
| Asmo Visuals Ltd | Information & communication | 2025 |
| ASN Choice Ltd | Real estate | 2025 |
| ASN Providers Ltd | Administrative & support | 2019 |
| Asnphotography Ltd | Professional & scientific | 2021 |
| Asomdwe Homes Ltd | Households | 2024 |
| ASP Plumbing and Heating (Nottingham) Ltd | Construction | 2026 |
| Aspa Trading Ltd | Manufacturing | 2021 |
| Aspasia Events Ltd | Administrative & support | 2021 |
| Aspbury Planning Limited | Professional & scientific | 2002 |
| Aspect East Midlands Ltd | Information & communication | 2024 |
| Aspects Installations Ltd | Construction | 2020 |
| Aspectu Medical & Health Technologies Ltd | Professional & scientific | 2020 |
| Aspen EVO Holdings Limited | Financial services | 2022 |
| Aspen Extra Care Living Limited | Extraterritorial | 2009 |
| Aspen Infotech Ltd | Information & communication | 2024 |
| Aspen Landscaping & Driveways Limited | Administrative & support | 2016 |
| Aspen Public Houses Ltd | Hospitality | 2014 |
| Aspen Retirement Limited | Real estate | 2009 |
| Aspen Retirement Living Limited | Extraterritorial | 2009 |
| Aspestates Ltd | Real estate | 2020 |
| Asphire Limited | Professional & scientific | 2005 |
| Aspicio Limited | Information & communication | 2006 |
| Aspimed Limited | Health & social care | 2022 |
| Aspiration Training (England) Limited | Administrative & support | 2007 |
| Aspiration Training (Wales) Limited | Education | 2007 |
| Aspiration Training Limited | Professional & scientific | 2002 |
| Aspirational Designs Limited | Administrative & support | 2009 |
| Aspire 4 Fitness Limited | Arts & recreation | 2018 |
| Aspire Care Holdings Ltd | Hospitality | 2024 |
| Aspire Children's Care Home Ltd | Health & social care | 2025 |
| Aspire Communications (Holdings) Limited | Construction | 2009 |
| Aspire Communications (Properties) Limited | Real estate | 2009 |
| Aspire Communications Limited | Information & communication | 2003 |
| Aspire Community & Support Alliance CIC | Hospitality | 2025 |
| Aspire Developments (East Midlands) Limited | Construction | 2020 |
| Aspire Estates Limited | Real estate | 2016 |
| Aspire Future Consultants Ltd | Information & communication | 2024 |
| Aspire Multi - Academy Trust | Education | 2014 |
| Aspire Overseas Consultant (SMC Private ) Limited | Education | 2024 |
| Aspire to Greatness Limited | Professional & scientific | 2015 |
| Aspireon Ecommerce Ltd | Wholesale & retail | 2024 |
| Aspirepubs Limited | Hospitality | 2026 |
| Aspley Aspirations CIC | Other services | 2023 |
| Aspley Fish Bar Ltd | Hospitality | 2023 |
| Aspley Foods Ltd | Wholesale & retail | 2024 |
| Aspley Nail & Beauty Limited | Other services | 2023 |
| Aspley Superstore Limited | Wholesale & retail | 2025 |
| Aspley Trading Ltd | Real estate | 2019 |
| Aspley Workwear Rentals Limited | Wholesale & retail | 1978 |
| Aspley's Pizza Limited | Hospitality | 2023 |
| Asplins Chase Limited | Professional & scientific | 2018 |
| Aspyra Limited | Education | 2014 |
| Aspyre Contracts Ltd | Construction | 2018 |
| Aspyre Developments Ltd | Construction | 2018 |