| 1 Click Beds Ltd | Manufacturing | 2023 |
| 100% Effective Limited | Professional & scientific | 2002 |
| 1313 Estates Ltd | Hospitality | 2015 |
| 1725 (AG) Tapas& Wine Bar Limited | Hospitality | 2016 |
| 1ST Call Window and Door Repair Service Limited | Construction | 2025 |
| 1ST Home Design & Build Limited | Construction | 2026 |
| 202 Fulham Palace Road Limited | Households | 2021 |
| 2V Cleaning Limited | Administrative & support | 2017 |
| 2VENTURE Floor Care Limited | Administrative & support | 2018 |
| 360 Rope Solutions Ltd | Construction | 2009 |
| 3XA Design Ltd | Professional & scientific | 2020 |
| 49-51 Parade Residents Company Limited | Households | 2024 |
| 4BIDDEN Rizz Ltd | Wholesale & retail | 2025 |
| 4FS Building Solutions Limited | Construction | 2014 |
| 5 Star Valeting Ltd | Administrative & support | 2025 |
| 509 Arts Ltd | Arts & recreation | 2011 |
| 56 YAS Ltd | Hospitality | 2026 |
| 57 Investigations and Security Limited | Administrative & support | 2020 |
| 57 Investigations Limited | Administrative & support | 2017 |
| 92BK Travel Ltd | Transport & logistics | 2025 |
| 99 Group of Concultancy Limited | Professional & scientific | 2025 |
| A & S Carpets Limited | Wholesale & retail | 2000 |
| A & S Joinery (UK) Limited | Other services | 1999 |
| A & S Property Services & Debt Recovery Limited | Real estate | 2017 |
| A Fattorini the Jeweller Limited | Wholesale & retail | 2021 |
| A G (Lancaster 2015) Limited | Hospitality | 2015 |
| A G Enterprises (Lancaster) Limited | Hospitality | 2015 |
| A G Station (Caton) Limited | Hospitality | 2016 |
| A H Digital.Uk Ltd | Wholesale & retail | 2025 |
| A J Scott Plumbing & Heating Limited | Construction | 2026 |
| A K Plumbers and Joiners Limited | Construction | 2013 |
| A L Constructions Hudd Ltd | Construction | 2021 |
| A R Electrical (Yorkshire) Limited | Construction | 2014 |
| A Star Developments Ltd | Real estate | 2017 |
| A Tucker Limited | Hospitality | 2024 |
| A&Y Ltd | Health & social care | 2020 |
| A.C Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| A.M.S. GAS Limited | Construction | 2011 |
| A.S.K Legal Solutions Ltd | Professional & scientific | 2016 |
| A2Z Financial Services Limited | Financial services | 1999 |
| AA Optical Services Limited | Wholesale & retail | 2025 |
| Aagrah (Sandal) LLP | | 2017 |
| Aagrah Chapel Allerton LLP | | 2011 |
| Aagrah Foods Limited | Manufacturing | 2011 |
| Aagrah Spicepot Limited | Hospitality | 2025 |
| Aaisa Beauty Salons Ltd | Other services | 2025 |
| AAR Comms Ltd | Other services | 2019 |
| AB Cyber Ltd | Information & communication | 2025 |
| Abbey Landscapes (Yorkshire) Limited | Administrative & support | 2019 |
| Abbey Scaffolding Solutions Ltd | Construction | 2022 |
| Abbeybrook Investments Limited | Real estate | 2003 |
| Abbeybrook Property Holdings Ltd | Real estate | 2024 |
| Abbie Roofing Limited | Construction | 2025 |
| Abeardsley Ltd | Professional & scientific | 2024 |
| Ablb Management Company Limited | Professional & scientific | 2019 |
| Above Ground Ltd | Professional & scientific | 2020 |
| Absolutely Plastered (West Yorkshire) Limited | Construction | 2023 |
| AC Fabs Ltd | Manufacturing | 2026 |
| Academic Adventures Limited | Health & social care | 2025 |
| Accuracy GAS Limited | Construction | 2023 |
| Ace of Face Ltd | Other services | 2026 |
| Ace Software Consultancy Limited | Information & communication | 2026 |
| Acespeed Historic Motorsport Ltd | Wholesale & retail | 2023 |
| Acme Testing Limited | Information & communication | 2020 |
| Acorn Alternative Provision | Education | 2023 |
| Acorn Builders Ltd | Manufacturing | 2025 |
| Acrehowe JD Limited | Construction | 2024 |
| Acroatic Labs Ltd | Information & communication | 2025 |
| Active Construction Recruitment Ltd | Administrative & support | 2019 |
| Active Intelligence Limited | Administrative & support | 2005 |
| Acunity Limited | Information & communication | 1990 |
| Adam Language Services Limited | Professional & scientific | 2026 |
| ADD Construction (Yorkshire) Limited | Construction | 2016 |
| Addison Bishop Ltd | Construction | 2006 |
| Adept HR Ltd | Administrative & support | 2021 |
| ADM (Holdings) Limited | Professional & scientific | 2012 |
| Advance QA Ltd | Information & communication | 2024 |
| AEK Ultrasound Ltd | Public administration | 2026 |
| Aesthetic Touch Limited | Health & social care | 2008 |
| Aesthetica Beauty Limited | Other services | 2024 |
| Affordable Sinks Ltd | Wholesale & retail | 2025 |
| AFP Managed Services Limited | Information & communication | 2026 |
| Afterdark LAB Ltd | Information & communication | 2025 |
| Afyn Partners Limited | Other services | 2013 |
| AGC Taverns Ltd | Hospitality | 2023 |
| Agla Limited | Real estate | 2018 |
| AGT Leisure Ltd | Wholesale & retail | 2022 |
| AH Catering Ltd | Hospitality | 2018 |
| Aims Trader Private Limited | Wholesale & retail | 2023 |
| Air Distribution Management Limited | Wholesale & retail | 1999 |
| Aire Valley Campers Limited | Wholesale & retail | 2016 |
| Aire Valley Exteriors Limited | Construction | 2004 |
| Aire Valley Facades Ltd | Construction | 2025 |
| Aire Valley Service Centre Limited | Wholesale & retail | 2013 |
| Airedale Software Development Limited | Information & communication | 2013 |
| Airehead Beauty Limited | Other services | 2020 |
| Airehead Limited | Other services | 2020 |
| AJ Accounts Ltd | Professional & scientific | 2023 |
| AJ Renewables & Services Ltd | Construction | 2022 |
| AJA2A Properties Ltd | Real estate | 2025 |