| Ace Fibre Ltd | Information & communication | 2025 |
| Ace Five Ltd | Construction | 2023 |
| Ace Furniture Limited | Wholesale & retail | 2017 |
| Ace Haulage Ltd | Transport & logistics | 2021 |
| Ace Leicester Ltd | Construction | 2024 |
| Ace Medical Ltd | Health & social care | 2020 |
| Ace of Cuts Limited | Other services | 2024 |
| Ace of Estate Limited | Real estate | 2024 |
| Ace Properties (Holdings) Ltd | Financial services | 2024 |
| Ace Properties (Leicester) Ltd | Real estate | 2001 |
| Ace Property Developments Limited | Real estate | 1999 |
| Ace SIX Ltd | Construction | 2023 |
| Ace Sportswear Limited | Manufacturing | 1987 |
| Ace Transport Leicester Limited | Extraterritorial | 2010 |
| Acecycles Ltd | Construction | 2026 |
| Acemarketing - Marketing Agency Ltd | Professional & scientific | 2024 |
| Acephysio Ltd | Education | 2021 |
| Acepoint Engineering Services Limited | Professional & scientific | 1999 |
| Acering Limited | Wholesale & retail | 1986 |
| Acerte Limited | Arts & recreation | 2008 |
| Aces Event Management Ltd | Arts & recreation | 2017 |
| Aceso Global Health Consultants Limited | Professional & scientific | 2013 |
| Acetem UK Limited | Wholesale & retail | 2009 |
| ACF Group Ltd | Information & communication | 2017 |
| ACG Estates and Holdings Limited | Real estate | 2026 |
| Achaar Ltd | Hospitality | 2026 |
| Achampe Solutions Ltd | Information & communication | 2024 |
| Acheffane Trading Ltd | Wholesale & retail | 2025 |
| Achelois Ltd | Health & social care | 2023 |
| Achieve Construction Ltd | Construction | 2023 |
| Achieve Happily Limited | Professional & scientific | 2019 |
| Achievers Enterprise Ltd | Wholesale & retail | 2018 |
| Achieving Childcare Excellence Limited | Education | 2024 |
| Achieving Together Ltd | Health & social care | 2022 |
| Acies Property Limited | Real estate | 2010 |
| ACJ Building Contractors Ltd | Construction | 2023 |
| Acjs Services Limited | Construction | 2023 |
| ACK Limited | Other services | 2015 |
| Ackers Consulting Engineers Ltd | Professional & scientific | 2020 |
| Ackwauk Ltd | Wholesale & retail | 2023 |
| ACL Sheet Metal Ltd | Professional & scientific | 2003 |
| ACM Aggregates Limited | Wholesale & retail | 2025 |
| Acmcl Limited | Information & communication | 2020 |
| Acme (Leicester) Limited | Construction | 1998 |
| Acmee Ltd | Wholesale & retail | 2025 |
| Acocks Homes Ltd | Real estate | 2026 |
| Acode Healthcare Ltd | Health & social care | 2024 |
| Acomb Trustees Limited | Financial services | 2000 |
| Acore (UK) Limited | Wholesale & retail | 2012 |
| Acorn Aspirations Limited | Administrative & support | 2014 |
| Acorn Care Property Ltd | Administrative & support | 2015 |
| Acorn Commercial Interiors Ltd | Construction | 2010 |
| Acorn Consulting Services Limited | Professional & scientific | 2024 |
| Acorn Fostering Services Limited | Health & social care | 2003 |
| Acorn Mechanical Pipework Services Limited | Construction | 1992 |
| ACP Air Conditioning Solutions Ltd | Construction | 2009 |
| Acquest Apparel Ltd | Wholesale & retail | 2017 |
| Acquire Axis Ltd | Information & communication | 2023 |
| Acquire Digital Multimedia Ltd | Information & communication | 2005 |
| Acquire Property Group Limited | Real estate | 2020 |
| Acquisition & Promotions Ltd | Administrative & support | 2025 |
| Acquisition Services Limited | Administrative & support | 2001 |
| Acqumen Limited | Professional & scientific | 2012 |
| ACR Electrical Contractors Limited | Construction | 2017 |
| ACR Signs Limited | Manufacturing | 2017 |
| Acrc Holdings Limited | Real estate | 2020 |
| Acres&Home Ltd | Real estate | 2025 |
| ACS UK IT Consulting Ltd | Public administration | 2018 |
| ACS UK Properties Ltd | Real estate | 2019 |
| ACT 4 Displays Limited | Professional & scientific | 2026 |
| ACT Industrial Buildings Ltd | Construction | 2018 |
| ACT on Notes Ltd | Wholesale & retail | 2026 |
| Action Awareness East Midlands Ltd | Education | 2025 |
| Action Awareness Training Centre Limited | Education | 2026 |
| Action Deafness | Professional & scientific | 2008 |
| Action Estates Services Ltd | Real estate | 2023 |
| Action Freight Ltd | Transport & logistics | 2024 |
| Action Real Estates Ltd | Real estate | 2024 |
| Action Trust (Leicester) Ltd | Administrative & support | 2014 |
| Actioncoach Foundation Ltd | Administrative & support | 2016 |
| Activ OPS Solutions Ltd | Information & communication | 2016 |
| Activationx Ltd | Professional & scientific | 2025 |
| Active BIZ Services Ltd | Administrative & support | 2020 |
| Active Equine Limited | Professional & scientific | 2021 |
| Active Hub Ltd | Wholesale & retail | 2020 |
| Active Lives Community CIC | Arts & recreation | 2024 |
| Active Personnel Management Limited | Professional & scientific | 1998 |
| Active Power Electronics Ltd | Professional & scientific | 2024 |
| Active Staffing Limited | Administrative & support | 2019 |
| Activeair Limited | Wholesale & retail | 2020 |
| Acton Developments Limited | Construction | 2022 |
| Actuarial JVR Ltd | Professional & scientific | 2025 |
| Acuherb TCM Ltd | Health & social care | 2026 |
| Acuity Tax & Legal Ltd | Professional & scientific | 2014 |
| Acumen Growth Accounting Ltd | Professional & scientific | 2025 |
| Acura Prop Ltd | Real estate | 2017 |
| Acurent Ltd | Households | 2022 |
| Acute Mobile Ltd | Wholesale & retail | 2025 |
| Acuvista Ltd | Health & social care | 2025 |
| AD 888 Limited | Hospitality | 2024 |