| (Un)Covered Events Ltd | Administrative & support | 2022 |
| 00969759 Limited | Professional & scientific | 1970 |
| 10 Ventures Ltd | Professional & scientific | 2020 |
| 14 Rudloe Road Management Limited | Real estate | 1995 |
| 1ST Access Self Storage Peterborough Ltd | Transport & logistics | 1988 |
| 21159C Limited | Financial services | 2013 |
| 237 Shrewsbury Road RTM Company Ltd | Households | 2019 |
| 247 Clothing Direct Ltd | Manufacturing | 2019 |
| 25/7 Tailored Assistance Ltd | Professional & scientific | 2025 |
| 29:11 Management Services Limited | Professional & scientific | 2018 |
| 3 Counties Garage Doors Ltd | Construction | 2020 |
| 30 Springdale Road Limited | Households | 2002 |
| 313 Stars Limited | Real estate | 2024 |
| 354 Capital Limited | Financial services | 2017 |
| 3COUNTIES Accounts Training Service Ltd | Education | 2020 |
| 3GO Ltd | Extraterritorial | 2022 |
| 3PM2 Enterprises Limited | Wholesale & retail | 2025 |
| 3REIGN Ltd | Arts & recreation | 2011 |
| 3SIXTY Tattoo Removal Ltd | Other services | 2024 |
| 4 YOU Reablement and Support Limited | Health & social care | 2019 |
| 428 Design Limited | Information & communication | 2008 |
| 4FORTY3THREE Electrical Limited | Construction | 2020 |
| 4FORTY3THREE Ltd | Financial services | 2013 |
| 77 Publishing Ltd | Information & communication | 2024 |
| 8808 Capital Limited | Financial services | 2011 |
| 9NBP Limited | Real estate | 2002 |
| A & H Property Development Limited | Hospitality | 2006 |
| A & K Moon Limited | Hospitality | 2020 |
| A & R Services Maintenance Limited | Construction | 2013 |
| A & T Underwriting LLP | | 2009 |
| A 1 Gurkha Travels Ltd | Transport & logistics | 2024 |
| A 2 B Bookkeeping Limited | Professional & scientific | 2012 |
| A Carter Ltd | Administrative & support | 2026 |
| A Dogs Life Dog Day-Care UK Ltd | Other services | 2017 |
| A F C Plumbing & Heating Limited | Construction | 2014 |
| A F Personal Holdings Ltd | Financial services | 2019 |
| A F Portfolio Ltd | Real estate | 2019 |
| A Gush Tutoring Ltd | Education | 2026 |
| A J Gibbons Limited | Health & social care | 2016 |
| A J Morris Ltd | Construction | 2007 |
| A W Aitman Groundworks Limited | Construction | 2012 |
| A&C Brickwork Ltd | Construction | 2025 |
| A&J's Pubs Ltd | Hospitality | 2022 |
| A&R Real Estate Holdings Ltd | Households | 2023 |
| A&T Spuds Ltd | Hospitality | 2025 |
| A-Training CW Limited | Health & social care | 2019 |
| A. & B. Priest Limited | Real estate | 1973 |
| A. & B. White (Frinkley) Limited | Agriculture & fishing | 1990 |
| A.A.N. Contracting Ltd | Construction | 2023 |
| A.C Landscaping and Building Services Ltd | Construction | 2025 |
| A.D.A Property Services Ltd | Real estate | 2021 |
| A.D.M Building Services Ltd | Construction | 2023 |
| A.T. Industries Limited | Wholesale & retail | 1994 |
| A1 Estates Ltd | Real estate | 2023 |
| A1 Fire and Security Solutions Limited | Administrative & support | 2015 |
| A1 Perfect Plumbing Limited | Construction | 2005 |
| A2B Motor Sales Limited | Wholesale & retail | 2014 |
| A52 Motor Sales Limited | Wholesale & retail | 2025 |
| AAA Underwriting Limited | Financial services | 2009 |
| AAG Commercial Property Ltd | Real estate | 2023 |
| AAL Events Ltd | Other services | 2025 |
| Aanvibrothers Ltd | Hospitality | 2026 |
| AAS Electrical Group Ltd | Construction | 2025 |
| AAS Electrical Ltd | Construction | 2021 |
| AB Taxi Services Ltd | Transport & logistics | 2020 |
| Abacus 114 Limited | Professional & scientific | 2008 |
| Abacus One Limited | Construction | 2008 |
| Abbey Farm Contractors Limited | Administrative & support | 2011 |
| Abby Food Store Ltd | Wholesale & retail | 2025 |
| ABC Aggregates Ltd | Wholesale & retail | 2025 |
| ABC Concrete Ltd | Manufacturing | 2021 |
| ABC Groundworks Limited | Administrative & support | 2025 |
| ABI Ventures Ltd | Administrative & support | 2025 |
| Ability Training Awards Ltd | Professional & scientific | 2024 |
| Abilume C.I.C. | Professional & scientific | 2026 |
| Able Finance & Loans Limited | Financial services | 2006 |
| Able Meeting Rooms Ltd | Administrative & support | 2022 |
| Able Training Support Ltd | Education | 2015 |
| Absolute Coffee Ltd | Wholesale & retail | 2023 |
| Abundantuk Ltd | Other services | 2009 |
| Academy Remedial Treatments Limited | Wholesale & retail | 1997 |
| Accolade Media Group Ltd | Information & communication | 2019 |
| Accountancy Administrative Services Limited | Administrative & support | 1995 |
| Accumulus Accountancy (Head Office) Limited | Professional & scientific | 2009 |
| Accumulus Accountancy Ltd | Professional & scientific | 2012 |
| Accumulus Accounting Ltd | Professional & scientific | 2012 |
| Accumulus Consultancy Limited | Professional & scientific | 2019 |
| Accumulus Hospitality Limited | Professional & scientific | 2016 |
| Accumulus Software Limited | Information & communication | 2015 |
| Accut Accounting and Consulting Services Limited | Professional & scientific | 2014 |
| Achieving Your Potential Limited | Professional & scientific | 2008 |
| Active Health & Wellbeing CIC | Health & social care | 2024 |
| Actomed Ltd | Wholesale & retail | 2019 |
| Acton LLP | | 2006 |
| Adam J Chambers Ltd | Information & communication | 2022 |
| Adams Properties Limited | Real estate | 1988 |
| Adam’S Barbers 11 Ltd | Other services | 2026 |
| Adaptive Rigging Technologies Ltd | Financial services | 2026 |
| Addicted to Writing Limited | Health & social care | 2020 |
| Addison NO. 1 LLP | | 2009 |