| Ace Provision Ltd | Education | 2023 |
| Ace Recruitment South-West Ltd | Administrative & support | 2021 |
| Ace Refrigeration Bristol Limited | | 1983 |
| Ace Roofing & Construction Ltd | Construction | 2022 |
| Ace Services (Bristol) Ltd | Administrative & support | 2019 |
| Ace Technical Ltd | Wholesale & retail | 2023 |
| Acennan CIC | Professional & scientific | 2023 |
| Acer Accounts Ltd | Professional & scientific | 2022 |
| Acer and Oak Limited | Construction | 2019 |
| Acer Leaf Limited | Real estate | 1993 |
| Acer Palmatum Ltd | Administrative & support | 2019 |
| Acer Space Limited | Real estate | 2024 |
| Acer Telecom Limited | Information & communication | 2011 |
| Acerbic Ltd | Real estate | 2010 |
| Aces Services Group Limited | Administrative & support | 1987 |
| Acesetters Ltd | Health & social care | 2023 |
| Aceso Chiropractic Ltd | Health & social care | 2020 |
| ACF Teambuilding and Events Ltd | Arts & recreation | 2012 |
| ACFM2 Limited | Professional & scientific | 2016 |
| ACG Finance Limited | Administrative & support | 2016 |
| ACG Future Limited | Arts & recreation | 2018 |
| Acgf Holdings Limited | Financial services | 2023 |
| Acgm Future Ltd | Arts & recreation | 2022 |
| ACH Loft Conversions Ltd | Construction | 2024 |
| Acharya Orthopaedics Limited | Health & social care | 2015 |
| Acheson-Crow Ltd | Information & communication | 2019 |
| Achha Ltd | Hospitality | 2021 |
| Achievers Solutions UK Ltd. | Professional & scientific | 2020 |
| Achieving Compliance Limited | Professional & scientific | 2019 |
| Achieving, Encouraging, Inspiring CIC | Public administration | 2023 |
| ACK Manufacturing Ltd | Manufacturing | 2020 |
| ACK Services Ltd | Other services | 2025 |
| Ackermann Transport Ltd | Transport & logistics | 2024 |
| Acklam Consulting Limited | Professional & scientific | 2007 |
| Ackland Lifts Limited | Manufacturing | 2024 |
| Ackland Wills & Estate Planning Ltd | Financial services | 2021 |
| ACL Asean Tower Infrastructure I LP | | 2012 |
| ACL Astute 2022 Limited | Real estate | 2002 |
| ACL Packaging Solutions Limited | Manufacturing | 2004 |
| ACL Rehab Online Limited | Health & social care | 2021 |
| ACL Solutions Ltd | Information & communication | 2012 |
| Aclax Developments Ltd | Real estate | 2023 |
| Aclax Ltd | Construction | 2014 |
| ACM Engineering Design Limited | Professional & scientific | 2011 |
| ACM Law Ltd | Professional & scientific | 2015 |
| Acme Real Estates Ltd | Real estate | 2022 |
| Acme Studios Limited | Professional & scientific | 2006 |
| Acoe Limited | Professional & scientific | 2023 |
| Acolyte Enviro Ltd | Water & waste | 2020 |
| Acolyte Interiors Ltd | Construction | 2024 |
| Acomarvic Limited | Financial services | 2026 |
| Acorn Chiropractic Limited | Health & social care | 2013 |
| Acorn Construction (Bristol) Limited | Professional & scientific | 1976 |
| Acorn Design (Bristol) Ltd | Professional & scientific | 2010 |
| Acorn Health & Safety Limited | Administrative & support | 2002 |
| Acorn Interviews Limited | Information & communication | 2025 |
| Acorn Pharmacy Limited | Wholesale & retail | 2009 |
| Acorn Preservations Limited | Professional & scientific | 2018 |
| Acorn Property Letting and Management Limited | Real estate | 2010 |
| Acorn Property Sales Limited | Real estate | 2007 |
| Acorn Property SW Ltd | Real estate | 2017 |
| Acorn Seed Investments Limited | Real estate | 2023 |
| Acorn Services (Northwood) Ltd | Administrative & support | 2020 |
| Acorn Supported Housing Ltd | Real estate | 2013 |
| Acorn Surfacing Limited | Construction | 2008 |
| Acorn Televillages Limited | Wholesale & retail | 1993 |
| Acorn to Oak Family Network Ltd | Education | 2023 |
| Acornco Ltd. | Manufacturing | 2002 |
| Acorns Guest House Limited | Hospitality | 2013 |
| Acountable Ltd | Extraterritorial | 2025 |
| Acourn Properties Ltd. | Real estate | 2016 |
| Acousta - FIL Management Limited | Professional & scientific | 2000 |
| Acoustaproducts Limited | Manufacturing | 1991 |
| Acoustic Carpentry and Building Ltd | Manufacturing | 2022 |
| Acoustic Consultants Limited | Professional & scientific | 2013 |
| Acoustic Dryline Ltd | Construction | 2013 |
| ACP Consulting Ltd | Professional & scientific | 2025 |
| ACP Management Consultants Limited | Professional & scientific | 2008 |
| Acpga UK Limited | Real estate | 2018 |
| Acqui General Trading Limited | Manufacturing | 2011 |
| Acquisitions of JMT Ltd | Real estate | 2021 |
| Acquisitions Syndicate (CRL) 2020 Limited | Professional & scientific | 2020 |
| Acquittal Music Ltd | Information & communication | 2024 |
| Acre Airport Parking Ltd | Transport & logistics | 2024 |
| Acre Electrical Services Limited | Construction | 2016 |
| Acre Property Solutions Limited | Real estate | 2021 |
| Acre Supply Co. Limited | Wholesale & retail | 2013 |
| Acrental Bristol Limited | Real estate | 2025 |
| Acro Retail Ltd | Wholesale & retail | 2025 |
| Acro Solutions Ltd | Administrative & support | 2025 |
| Acrs Future Ltd | Education | 2019 |
| ACS Group Management (UK) Limited | Administrative & support | 2025 |
| ACT 1.5 CIC | Professional & scientific | 2024 |
| ACT Catering Ltd | Manufacturing | 2025 |
| ACT Removals Ltd | Transport & logistics | 2025 |
| ACT4SEND Ltd | Education | 2018 |
| Actavistic Limited | Professional & scientific | 2014 |
| Acticare Neuro Ltd | Manufacturing | 2023 |
| Actify Solutions Ltd | Professional & scientific | 2014 |
| Acting OUT Ltd | Education | 2013 |