| A&R Nexus Limited | Bedford | 2020 |
| A&R Perfect Cleaning Eco & Safety Ltd | Bournemouth | 2025 |
| A&R Pharma Holdings Limited | Kirkby Lonsdale | 2019 |
| A&R Pro Talent Ltd | Glasgow | 2025 |
| A&R Quant Ltd | London | 2026 |
| A&R Roof and Hard Surface Cleaning & Restoration Ltd | Dunstable | 2020 |
| A&R Securities Ltd | Rotherham | 2024 |
| A&R Security Consultantancy Ltd | Bolton | 2025 |
| A&R Security Limited | Hornchurch | 2024 |
| A&S Appliance Valeting Ltd | Northampton | 2019 |
| A&S Car Hire Limited | Leicester | 2024 |
| A&S Catalyst Recruitment Limited | Scunthorpe | 2025 |
| A&S Central Security Ltd | London | 2024 |
| A&S Chauffeurs Limited | London | 2015 |
| A&S Cleaning Solutions UK Ltd | London | 2026 |
| A&S Concepts Limited | Swindon | 2014 |
| A&S London Ltd | London | 2014 |
| A&S Management Limited | Gloucester | 2015 |
| A&S Mobile Cleaning Services Ltd | Manchester | 2025 |
| A&S Productions Ltd | Dursley | 2025 |
| A&S Rees & Company Ltd | London | 2005 |
| A&S Reporting Ltd | Cannock | 2019 |
| A&S Resourcing Solutions Ltd | Kington | 2022 |
| A&S Services Aberdeen Limited | Aberdeen | 2024 |
| A&S Smart Services Ltd | Coventry | 2024 |
| A&S Top Cleaning Services Ltd | Luton | 2023 |
| A&S Vehicle Hire Ltd | Bury St. Edmunds | 2023 |
| A&S Veterans Bike Tours & Events Ltd | Poole | 2025 |
| A&S Window Cleaning Services Limited | Lichfield | 2008 |
| A&Spropertygrp Ltd | London | 2026 |
| A&T Cleaning Company Ltd | London | 2021 |
| A&T Cleaning Services Ltd | Tavistock | 2021 |
| A&T Cleaning Solutions Ltd | Keighley | 2024 |
| A&T Consultancy Ltd | London | 2026 |
| A&T Designs Ltd | Newport Pagnell | 2014 |
| A&T Fairway Valets Limited | Dunstable | 2026 |
| A&T Future Concepts Limited | Wednesbury | 2020 |
| A&T Heath Solutions Ltd | Newbury | 2016 |
| A&T Leasing Ltd | Huddersfield | 2024 |
| A&T Management Limited | Newry | 2010 |
| A&T Optimus Ltd | Ipswich | 2019 |
| A&T Property Deals Ltd | London | 2024 |
| A&T Recruitment Solutions Ltd | Chatham | 2025 |
| A&T Scaffolding Services Ltd | Wellingborough | 2017 |
| A&T Staffing Ltd | London | 2019 |
| A&U Consultants Ltd | Luton | 2021 |
| A&U Tours Ltd | London | 2026 |
| A&V Building Maintenance Ltd | Peterborough | 2016 |
| A&W Holdings and Trading Limited | Morecambe | 2026 |
| A&W Leasing Limited | London | 2009 |
| A&W Partners Ltd | Trowbridge | 2022 |
| A&W Software UK Limited | Watford | 2012 |
| A&W Transport Ltd | Hayes | 2017 |
| A&Z Quality DRY Cleaners Ltd | London | 2023 |
| A&Z Theatre CIC | London | 2025 |
| A'Aru Collective Limited | Abingdon | 2023 |
| A'Liyah Chair Rentals Limited | Derby | 2021 |
| A'S Cleaning Maids (Kent) Ltd | Sevenoaks | 2011 |
| A'S Lawns Limited | Edgware | 2019 |
| A+ Design Limited | London | 2006 |
| A, J Langley Limited | Beverley | 2009 |
| A-1 UK Security Group Ltd | Portishead | 2025 |
| A-2-Z Tree & Garden Services Ltd | Southall | 2017 |
| A-A Quality Care Ltd | Horley | 2016 |
| A-Axis Architects Ltd | Warrington | 2023 |
| A-Chem Plant & Equipment Limited | Alfreton | 2008 |
| A-Clean Solutions Ltd | London | 2025 |
| A-Clean-Get-Away Ltd | Kingsbridge | 2016 |
| A-Cold-Wall* Limited | London | 2016 |
| A-Comp International Ltd | Barking | 2015 |
| A-Concierge Ltd | Hemel Hempstead | 2026 |
| A-Day Consultants Limited | Manchester | 2002 |
| A-Door Solutions (SW) Limited | Taunton | 2024 |
| A-Fest Andover CIC | Andover | 2019 |
| A-Force Security Group Ltd | Birmingham | 2023 |
| A-Gas International Limited | Bristol | 1986 |
| A-Grade Industrial Cleaning Limited | Huddersfield | 2023 |
| A-Gradepeople Ltd | Belper | 2025 |
| A-Greed Mediation Limited | Newcastle Upon Tyne | 2020 |
| A-Guard Robotics Limited | London | 2025 |
| A-House Investments Limited | London | 2016 |
| A-Kwart Cleaning Expert Ltd | London | 2025 |
| A-L Chambers Ltd | Blandford | 2022 |
| A-Level Access (Ormskirk) Limited | Southport | 2017 |
| A-Lign Compliance and Security UK Ltd | Bicester | 2018 |
| A-Line Coaches Coventry Ltd | Coventry | 2012 |
| A-Line Hydraulics Limited | Stratford-Upon-Avon | 2008 |
| A-Line Management Limited | Stratford-Upon-Avon | 2014 |
| A-List Management Limited | London | 2013 |
| A-List Promotions Ltd | Bristol | 2026 |
| A-List Recruitment Ltd | Derby | 2021 |
| A-Luxe Production Ltd | Pinner | 2025 |
| A-Mark Services Limited | Gerrards Cross | 2015 |
| A-One Action Ltd | London | 2021 |
| A-One Cleaning Services Limited | Nottingham | 2001 |
| A-One Direct (Holdings) Limited | Crawley | 2018 |
| A-One Direct Recruitment Limited | Crawley | 2002 |
| A-One Shuttering Limited | Dungannon | 2002 |
| A-Path Solutions Ltd | Crowborough | 2019 |
| A-Ram Trading Limited | Redditch | 2005 |