| A Brixton Engineering Ltd | Westhill | 2026 |
| A Brookes Engineering Ltd | Wilmslow | 2024 |
| A Brown & Associates Limited | Altrincham | 2013 |
| A Brown and Company Ltd. | London | 2017 |
| A Browne Ltd | London | 2026 |
| A Bryant Contracting Limited | Fareham | 2017 |
| A Bryson Designs Ltd. | Ballymena | 2011 |
| A Budden Consultancy Limited | Witney | 2022 |
| A Bull Consulting Limited | Norwich | 2022 |
| A Bulloch & Company Limited | Glasgow | 2016 |
| A Burnside | Omagh | 2015 |
| A Burr Management Ltd | Hemel Hempstead | 2020 |
| A Business Mind Ltd | Cheltenham | 2024 |
| A Butler & Co Limited | Derby | 2001 |
| A BUX Ltd | Milton Keynes | 2019 |
| A Buxton Consulting Ltd | Huddersfield | 2022 |
| A Buyside Perspective Limited | Sandy | 2022 |
| A Byatt Consultancy Ltd | Perranporth | 2014 |
| A Byrnes & SON Limited | Manchester | 2020 |
| A C a Digital Marketing Limited | Peterborough | 2026 |
| A C Accountancy Services Limited | Walsall | 2014 |
| A C Accounting and Payroll Ltd | Kettering | 2012 |
| A C Asbestos Consultants Limited | Bridgwater | 2018 |
| A C Assessors Ltd | Stockport | 2009 |
| A C Avalon Advisory Ltd | London | 2017 |
| A C Barston Limited | Oak Lane, Barston | 2015 |
| A C Bloomberg Consulting Ltd | Cheltenham | 2016 |
| A C Bookkeeping Ltd | Leicester | 2013 |
| A C Bright Spark Services Limited | Croydon | 2014 |
| A C Business Services Limited | Spennymoor | 2020 |
| A C Consultancy Limited | Flitwick | 2008 |
| A C D Engineering Limited | Coventry | 2004 |
| A C Design (UK) Limited | Gloucester | 2002 |
| A C Dinardo Limited | Chipping Norton | 2020 |
| A C E - Surveys Limited | Horsham | 2001 |
| A C E Management Group Limited | Bromley | 2022 |
| A C Ecology Ltd | Newton Abbot | 2022 |
| A C Electrical & Mechanical Services Limited | Sheffield | 2013 |
| A C Elite Ltd | Cheshunt | 2020 |
| A C Employment Solicitors Limited | Fareham | 2016 |
| A C English Developments (Southdown) Ltd | Eastleigh | 2003 |
| A C English Investment Ltd | Eastleigh | 2003 |
| A C Environment Solutions Ltd | Barnsley | 2010 |
| A C F Gare & Co Ltd | Windsor | 2018 |
| A C Fabrications & Pipework (Petrochemicals) Limited | Rickmansworth | 1949 |
| A C Farrington Ltd | Andover | 2010 |
| A C Fitton & Co Limited | Marlborough | 1986 |
| A C Fraser Ltd | Taunton | 2016 |
| A C Freeman Investments Limited | Pineham | 2015 |
| A C G Consultancy Limited | Benfleet | 2017 |
| A C G Shields Limited | Ashby-De-La-Zouch | 2015 |
| A C Geotechnical and Environmental Services Ltd | Colchester | 2020 |
| A C Gold Forever Warm Limited | Stirling | 2008 |
| A C Grace and Company Limited | Wrexham | 2016 |
| A C Holdom Surveyors Limited | London | 1997 |
| A C Homer Limited | Caterham | 2012 |
| A C Jordan Wealth Management Ltd. | Prescot | 2017 |
| A C Legal Services Limited | | 2003 |
| A C Leigh (Security) Limited | Norfolk | 2007 |
| A C M (UK) Ltd | Buckinghamshire | 1995 |
| A C M Consulting Limited | Saffron Walden | 2010 |
| A C M Power Management Limited | Biggleswade | 2009 |
| A C Management Associates Ltd | London | 1999 |
| A C Moat Ltd | Bolton | 2024 |
| A C Pamphilon Ltd | Penrith | 2024 |
| A C Richards Consulting Limited | London | 2009 |
| A C S Architectural Ltd | King'S Lynn | 2012 |
| A C Solutions Limited | Watford | 2001 |
| A C Squared Limited | Lichfield | 2004 |
| A C Stevens Engineering Ltd | Newent | 2016 |
| A C Sujevic Limited | London | 2013 |
| A C Sullivan Trading Limited | Liverpool | 2023 |
| A C Swayne Consulting Ltd | Milton Keynes | 2024 |
| A C Tamlyn Limited | Alrincham | 2026 |
| A C Tucker & Co Limited | Littlehampton | 2006 |
| A C Union Limited | London | 2008 |
| A C W Engineering Services Limited | Fareham | 1999 |
| A C Welding Limited | Leicester | 2025 |
| A Caldwell Consultant Limited | Morecambe | 2025 |
| A Calm Sleep Ltd | Macclesfield | 2022 |
| A Campbell Engineering Solutions Ltd | Manchester | 2010 |
| A Campbell Solutions Ltd | Ellon | 2012 |
| A Capital Recruitment Ltd | Ilford | 2026 |
| A Carey Limited | Helston | 2024 |
| A Carroll Associates Ltd | | 2002 |
| A Case for Coaching Ltd | Camberley | 2019 |
| A Cauldron of Bullamasay Limited | Willenhall | 2021 |
| A CBN Limited | London | 2021 |
| A Certain Everything Limited | Pinner | 2018 |
| A Certain Poole Ltd | Wilmslow | 2019 |
| A Certain Vintage Limited | Ripley | 2022 |
| A Chagani Ltd | Ilford | 2017 |
| A Change of Tack Limited | Leeds | 2012 |
| A Chapman Consultancy Ltd | Sheffield | 2026 |
| A Charles Associates Limited | Birmingham | 2017 |
| A Charlton Mechanical Services Limited | Leeds | 2012 |
| A Chinn Services Ltd | Coventry | 2026 |
| A Chip OFF the Old Rock Ltd | East Brent | 2013 |
| A Choice Limited | Wolverhampton | 2004 |
| A Christie Consulting Limited | Wimborne | 2020 |