| Avak & Co Ltd | London | 2006 |
| Avalanche Holdings Limited | Nuneaton | 2017 |
| Avalennek Cabins Ltd | Falmouth | 2024 |
| Avalere Health Brand Holdings Limited | London | 2021 |
| Avalon Developments Ltd | Liverpool | 2014 |
| Avalon Futures Limited | Brighton | 2013 |
| Avalon Motor Co South West Limited | Glastonbury | 2020 |
| Avalon Optics Limited | Glasgow | 2026 |
| Avalon Properties UK Ltd | Narbeth | 2006 |
| Avalon United (UK) Ltd | London | 2025 |
| Avance Clinic Limited | Derby | 2019 |
| Avant Hire UK Ltd | Bury St. Edmunds | 2009 |
| Avant Homes (Central) Limited | Chesterfield | 1989 |
| Avant Homes (Sunderland) Limited | Chesterfield | 1998 |
| Avant Skills Academy Limited | Grimsby | 2019 |
| Avant-Garde Guitars Limited | | 1998 |
| Avanta Serviced Office Group Limited | London | 2000 |
| Avanta Waste Solutions Limited | Stowmarket | 2025 |
| Avantara Ltd | Wakefield | 2019 |
| Avantedge Limited | Alderholt | 2016 |
| Avantgarde UK Group Ltd | London | 2018 |
| Avanthe Ltd | Coventry | 2025 |
| Avanti Ventures Ltd. | London | 1997 |
| Avantly Ltd | Sittingbourne | 2015 |
| Avantus Technology Limited | Reading | 2014 |
| Avanza Events Holding Limited | London | 2023 |
| Avarice Enterprises Ltd | Glasgow | 2018 |
| Avatar Accounting & Taxation Ltd | Reading | 2018 |
| Avatar TV Limited | St. Helens | 2020 |
| Avato Ltd | Wigan | 2021 |
| Avaunt Staking Services Limited | Coulsdon | 2021 |
| Avaux Limited | Plympton | 2024 |
| AVB & Daughters Ltd | London | 2023 |
| AVB Limited | Weston-Super-Mare | 2004 |
| AVC (Abergavenny) Limited | York | 2019 |
| AVC 35 Limited | Bristol | 2010 |
| AVD Industrial and Port Services Ltd | Middlesborough | 2019 |
| Avdal Construction Investment Limited | London | 2021 |
| Avdal Construction Limited | London | 2021 |
| Avdee Ltd | Chadwell Heath | 2016 |
| AVE Cabs Newbury Limited | Newbury | 2026 |
| Avebury Business Solutions Limited | London | 2013 |
| Avebury Mews Management Company (Number 1) Limited | St. Columb | 2005 |
| Avec Trade Limited | Bournemouth | 2019 |
| Avecare Plus Limited | Heywood | 2024 |
| Aveho Limited | London | 2012 |
| Avel Lindberg Limited | London | 2006 |
| Aveltus Limited | London | 2014 |
| Avensure Peoplecloud Ltd | Manchester | 2023 |
| Avent Limited | Farnborough | 1936 |
| Aventourini Limited | London | 2006 |
| Aventum Capital Limited | London | 2021 |
| Aventure Airways Ltd | Bristol | 2022 |
| Aventure Holding Ltd | Bristol | 2023 |
| Aventure International Ltd | Bristol | 2019 |
| Aventure Partners Limited | Huntingdon | 2022 |
| Aventure Properties Ltd | Bristol | 2021 |
| Aventure Property Ltd | Bristol | 2020 |
| Aventus-Sales INT. Limited | London | 2016 |
| Avenue 1968 Limited | Newcastle Upon Tyne | 2013 |
| Avenue 25 Consultants Limited | Pinner | 1998 |
| Avenue Direct Limited | Edenbridge | 2011 |
| Avenue Events International Limited | Slough | 2022 |
| Avenue Events Ltd | Slough | 2006 |
| Avenue Investment Company Ltd | Hertfordshire | 1972 |
| Avenue of Star Co., Ltd | Beckenham | 2023 |
| Avercet Limited | Beaconsfield | 2009 |
| Averge Technologies UK Limited | Bingley | 2024 |
| Averill Limited | Salford | 2003 |
| Averit Ltd | Leeds | 2019 |
| Avery Cannock Opco Limited | Northampton | 2019 |
| Avery Healthcare Developments Limited | Northampton | 2013 |
| Avery Healthcare Limited | Northampton | 2008 |
| Avery Healthcare Management Limited | Northampton | 2009 |
| Avery Homes Kingstanding Limited | Northampton | 2013 |
| Avery Homes Lichfield Limited | Northampton | 2007 |
| Avery Homes RH Limited | Southampton | 2015 |
| Avery Homes Stratford Limited | Northampton | 2004 |
| Avery Productions Ltd | Wrexham | 2022 |
| Avery Recovery Ltd | Salisbury | 2017 |
| Avesta Stadservice Limited | London | 2021 |
| Aveverywhere Limited | Maidstone | 2024 |
| Avex Markets Limited | Benfleet | 2013 |
| AVG Enterprises Limited | Sevenoaks | 2014 |
| AVI Cease Limited | Manchester | 2007 |
| AVI Nature Ltd | Hinckley | 2022 |
| Avia Technical Services Limited | Immingham | 2002 |
| Aviacargo Limited | Poole | 2020 |
| Avianca Group (UK) Limited | Altrincham | 2021 |
| Avianca Midco 1 Limited | Altrincham | 2021 |
| Avianca Midco 2 PLC | Altrincham | 2021 |
| Aviateq Limited | Maidenhead | 2006 |
| Aviation Connect Limited | Macclesfield | 2012 |
| Aviation Management Limited | Kidderminster | 2001 |
| Aviation Science Limited | Elmsett | 1999 |
| Aviative Ltd. | London | 2007 |
| Aviato Consulting Limited | London | 2015 |
| Avid Games Ltd | Heathfield | 2023 |
| Avid Online Marketing Ltd | Didcot | 2019 |
| Aviemore Dog Park Ltd | Aviemore | 2022 |