| Apollo 13 Investments | Financial services | 2013 |
| Apollo 3D Ltd | Professional & scientific | 2017 |
| Apollo Cloud Solutions (Harrogate) Limited | Information & communication | 2008 |
| Apollo Cloud Solutions Limited | Information & communication | 2014 |
| Apollo Financial Consultancy Ltd | Financial services | 2023 |
| Apollo Healthcare Technologies Limited | Manufacturing | 2012 |
| Apollo Lighting Limited | Manufacturing | 1980 |
| Apollo Mechanical & Building Physics LLP | | 2025 |
| Apollo PCN Limited | Health & social care | 2025 |
| Apollo Safety Consulting Ltd | Professional & scientific | 2023 |
| Apollo Scaffolding (Leeds) Ltd | Construction | 2010 |
| Apollo Supermarket Ltd | Wholesale & retail | 2023 |
| Apoptogenth Limited | Professional & scientific | 2025 |
| Apositive Limited | Administrative & support | 2025 |
| Apostle Accounting Limited | Professional & scientific | 2012 |
| Apotheco Coffee Limited | Hospitality | 2023 |
| Apotheco Shop Limited | Wholesale & retail | 2022 |
| App Automotive Ltd | Construction | 2019 |
| App DEV Contracting Ltd | Information & communication | 2018 |
| App Residential Ltd | Construction | 2019 |
| App UK Logistics Limited | Transport & logistics | 2018 |
| Appchemy Limited | Professional & scientific | 2016 |
| Appday Limited | Information & communication | 2011 |
| Appdev Limited | Information & communication | 2019 |
| Appeal Avenue LLP | | 2025 |
| Appearl Ltd | Households | 2022 |
| Apperdale Developments Limited | Real estate | 2002 |
| Apperdale Mills (Apartments) Management Company Limited | Households | 2004 |
| Apperley Bridge Foods Limited | Hospitality | 2019 |
| Apperley Bridge Limited | Real estate | 2009 |
| Apperley Bridge Marina Ltd | Transport & logistics | 2025 |
| Apperley Vehicle Management Solutions Limited | | 2000 |
| Appetite Online Ltd | Professional & scientific | 2022 |
| Appetite Yorkshire Ltd | Hospitality | 2020 |
| Apphatch Ltd | Information & communication | 2023 |
| Appiconic IT Limited | Information & communication | 2025 |
| Appin Bay View Ltd | Hospitality | 2017 |
| Apple Box Company | Information & communication | 2011 |
| Apple Corner Leeds Ltd | Construction | 2019 |
| Apple Fitted (Leeds) Limited | Wholesale & retail | 2023 |
| Apple HR Support Ltd | Administrative & support | 2015 |
| Apple Lets Ltd | Real estate | 2023 |
| Apple Moon Limited | Manufacturing | 2010 |
| Apple PIE Consulting Ltd | Professional & scientific | 2011 |
| APPLE2GO Ltd | Wholesale & retail | 2024 |
| Appleby Consultix Ltd | Information & communication | 2024 |
| Appledale Limited | Other services | 2010 |
| Applegarth Cottage Limited | Professional & scientific | 1989 |
| Applegarth Holdings | Financial services | 2015 |
| Applegarth Holdings NO.2 | Financial services | 2024 |
| Applegarth Property Maintenance Ltd | Administrative & support | 2013 |
| Applemet Limited | Manufacturing | 1974 |
| Appleson (Shoes) Limited | | 1926 |
| Appletree Projects Ltd | Construction | 2017 |
| Appletrees Associates Limited | Professional & scientific | 2014 |
| Applewood Property Solutions Ltd | Real estate | 2022 |
| Appleyard Contracts Limited | Construction | 2012 |
| Appleyard House Consulting Limited | Information & communication | 2025 |
| Appleyard Properties Limited | Real estate | 2022 |
| Appliance Discounts Ltd | Wholesale & retail | 2026 |
| Appliance TEC Intelligence Ltd | Manufacturing | 2016 |
| Applica Ltd | Administrative & support | 2017 |
| Applied Creative Limited | Professional & scientific | 2016 |
| Applied Credit Limited | Financial services | 2024 |
| Applied Crisis Underwriters Limited | Financial services | 2024 |
| Applied Entertainment and Sports Limited | Financial services | 2024 |
| Applied Machinery Safety Ltd | Professional & scientific | 2025 |
| Applied Marine Limited | Financial services | 2026 |
| Applied Metal Technology Holdings Limited | Financial services | 2026 |
| Applied Metal Technology Limited | Manufacturing | 2003 |
| Applied Novelty Limited | Professional & scientific | 2012 |
| Applied Psychologists & Associates Ltd | Health & social care | 2006 |
| Apply Ltd | Wholesale & retail | 2024 |
| Applyearly Limited | Financial services | 2018 |
| Apprenticeshipally Ltd | Professional & scientific | 2026 |
| Approach Construction Limited | Construction | 2023 |
| Approved Building Products Ltd | Wholesale & retail | 2019 |
| Approved Workforce Limited | Administrative & support | 2010 |
| Appsanywhere Limited | Administrative & support | 2009 |
| Appshare Ltd | Information & communication | 2026 |
| APR Ecommerce Limited | Wholesale & retail | 2017 |
| Aproserv Limited | Information & communication | 2015 |
| APS Construction (Yorkshire) Ltd | Construction | 2023 |
| Apss Properties Ltd | Real estate | 2018 |
| APT Aviation Limited | Transport & logistics | 2007 |
| APT Construction (Yorkshire) Limited | Construction | 2019 |
| APT Elevators Limited | Manufacturing | 2023 |
| APT Option Limited | Wholesale & retail | 2025 |
| APT Property Letting Ltd | Real estate | 2026 |
| Aptar UK Limited | Manufacturing | 1979 |
| Aptargroup UK Holdings Limited | Professional & scientific | 2002 |
| Aptiv Financial Holdings (UK) LLP | | 2012 |
| Aptiv International Financial Services (UK) LLP | | 2012 |
| Aptlogix Limited | Information & communication | 2007 |
| Aptuition Ltd | Education | 2020 |
| Aptus Legal Ltd | Professional & scientific | 2025 |
| APV Leisure Limited | Arts & recreation | 1992 |
| AQ Holding Ltd | Financial services | 2024 |
| AQ Logistics Limited | Transport & logistics | 1992 |
| AQ Property Maintenance Ltd | Construction | 2023 |