| Ades Haven Limited | Real estate | 2025 |
| Adrawell Limited | Real estate | 1993 |
| Adsm International Limited | Construction | 2015 |
| Adtapt Limited | Administrative & support | 2006 |
| Advanced Business Strategies Limited | Professional & scientific | 2006 |
| Advanced Data Solutions UK Limited | Information & communication | 1998 |
| Advanced Marketing Solutions North West Ltd | Professional & scientific | 2024 |
| Advanced Psychology Ltd | Health & social care | 2026 |
| Advanced Surface Applications Ltd | Construction | 2025 |
| Advertising Technique Limited | Manufacturing | 2006 |
| AEB Optimum Management Ltd | Professional & scientific | 2010 |
| Aegient Ltd | Information & communication | 2026 |
| Aesthetic Dental Solutions Ltd | Health & social care | 2007 |
| AFB Plant Limited | Administrative & support | 2021 |
| Afroditi S. International Ltd | Professional & scientific | 2021 |
| Agenta Cars Ltd | Wholesale & retail | 2025 |
| Agentic Thinking Ltd | Information & communication | 2026 |
| Agnew (Management) Limited | Real estate | 1984 |
| AI Rehab Ltd | Manufacturing | 2019 |
| Ai-K Consulting Ltd | Professional & scientific | 2022 |
| AIA Technologies Limited | Information & communication | 2015 |
| Aidan Cartmell Ltd | Arts & recreation | 2025 |
| Air Anaesthesia Limited | Health & social care | 2006 |
| Aircheck Services (UK) Limited | Professional & scientific | 2007 |
| Airit Consulting Ltd | Information & communication | 2014 |
| Aituca Limited | Information & communication | 2025 |
| AIW Holdings Ltd | Transport & logistics | 2003 |
| AJ Autoworks Limited | Wholesale & retail | 2025 |
| AJC Information Systems Limited | Information & communication | 2022 |
| AJC Project Controls Ltd | Real estate | 2015 |
| AJG Lytham Limited | Hospitality | 2022 |
| AJS Healthcare Limited | Health & social care | 2016 |
| AK Fast Services Ltd | Wholesale & retail | 2026 |
| AKG Marketing Ltd | Information & communication | 2016 |
| AKT Locum Ltd | Health & social care | 2014 |
| Al's Auto Centre Ltd | Wholesale & retail | 2021 |
| Al-Midani Properties Ltd | Real estate | 2025 |
| Alan Scott Consulting Limited | Professional & scientific | 2011 |
| Albert Hartley Limited | Wholesale & retail | 2019 |
| Alchemy Events Limited | Professional & scientific | 2015 |
| Aldridge Projects Limited | Extraterritorial | 2022 |
| Alethos Therapies Limited | Health & social care | 2025 |
| Alexandria Curry Lounge Ltd | Hospitality | 2023 |
| Alexandria Lodge Limited | Households | 1974 |
| Algar Limited | Professional & scientific | 2022 |
| Algdz Ltd | Hospitality | 2019 |
| Alister Fair Consulting Limited | Professional & scientific | 2009 |
| ALJ Farms Ltd | Agriculture & fishing | 2022 |
| ALL in One NO 3 Ltd | Hospitality | 2019 |
| ALL WIN Tennis Ltd | Arts & recreation | 2012 |
| Allegria Restaurant Ltd | Hospitality | 2016 |
| Allitt Properties Ltd | Real estate | 2021 |
| Allium C.S. Limited | Administrative & support | 2022 |
| Allpower Electrical Wholesale Limited | Wholesale & retail | 2007 |
| Alma R2R Propertys Ltd | Real estate | 2025 |
| Alonso Monedero Ltd | Information & communication | 2020 |
| Alpha Drive (North West) Ltd | Other services | 2023 |
| Alpha SIX Limited | Administrative & support | 1997 |
| Alphabet ST Limited | Real estate | 2023 |
| Alpine Lodge Limited | Households | 1988 |
| Always EAR Limited | Wholesale & retail | 2019 |
| Amadeus Technologies Limited | Professional & scientific | 2022 |
| Amap Development Services Ltd | Professional & scientific | 2022 |
| Amber Rose Watmough Ltd | Professional & scientific | 2025 |
| Aminna Limited | Other services | 2014 |
| Amvicas Limited | Administrative & support | 2012 |
| AMY Waeland Mortgage Services Limited | Financial services | 2014 |
| Anahata Holistics Ltd | Health & social care | 2025 |
| Anatolia Sea View ST Annes Limited | Hospitality | 2024 |
| Anaweb Ltd | Information & communication | 2022 |
| Andantes Properties Ltd | Real estate | 2025 |
| Andrew Black Bespoke Ltd | Wholesale & retail | 2022 |
| Andy Grey Productions Ltd | Arts & recreation | 2017 |
| Angel Aviation Ltd. | Professional & scientific | 2009 |
| Angel Properties (Fylde) Ltd | Real estate | 1997 |
| Angelwell Estates Ltd | Real estate | 2005 |
| Anglesey Rentals Limited | Real estate | 2019 |
| Anna Dolan Psychology Ltd | Health & social care | 2021 |
| Anopoly Property Limited | Real estate | 2019 |
| Ansdell Bikes Ltd | Wholesale & retail | 2016 |
| Anthony Hart Design Limited | Professional & scientific | 1999 |
| Apda Limited | Professional & scientific | 2004 |
| Apex Mobile Locksmiths Ltd | Manufacturing | 2017 |
| Apex Nutra Solutions Ltd | Professional & scientific | 2026 |
| Apexview Adhd Services Ltd | Health & social care | 2025 |
| APH Group Limited | Arts & recreation | 2025 |
| APH Supplements Limited | Arts & recreation | 2020 |
| APJ Health Ltd | Manufacturing | 2021 |
| App Environmental Consultants Limited | Construction | 2010 |
| Appletons Trading Solutions Ltd | Professional & scientific | 2010 |
| Appstal Limited | Information & communication | 2011 |
| Aquaheat (Lytham) Limited | Manufacturing | 2016 |
| Arafay Services Ltd | Health & social care | 2012 |
| Aravet Estates Limited | Real estate | 2017 |
| Araz's Barber Shop (Lytham St.Annes) Ltd | Other services | 2016 |
| Arbatel Capital Limited | Financial services | 2010 |
| Arbeit Global Ltd | Other services | 2019 |
| Arbeit Holdings Ltd | Information & communication | 2009 |
| ARC Accountancy Solutions Limited | Professional & scientific | 2020 |
| ARC Community Care Ltd | Health & social care | 2001 |