| Anthrax | 1980 | — | — |
| Anti Vigilante | 2004 | — | — |
| Anti-Clone | 2011 | — | — |
| Anti-Nowhere League | 1979 | — | — |
| Anti-System | 1981 | — | — |
| Antimatter | 1998 | — | English band |
| Antre | 2017 | — | — |
| Any Trouble | 1978 | — | — |
| AOS3 | 1990 | — | — |
| Apache Viking | August 2009 | — | — |
| Aphonic Threnody | 2012 | — | — |
| Apollo 440 | 1990 | — | electronic rock band |
| Apologies, I Have None | 2004 | — | — |
| Apparition | 2004 | — | — |
| Arab Strap | 1995 | — | Scottish indie rock band |
| Archie Caine | 2021 | — | — |
| Architects | 2004 | — | British metal band |
| Archive | 1994 | — | UK trip‐hop/post‐rock band |
| Arctic Monkeys | 2002 | — | — |
| Ardentjohn | 1 November 2005 | — | — |
| Arena | 1995 | — | British prog rock band |
| Argent | 1969 | — | — |
| Arkarna | 1994 | — | — |
| Arkdown | 17 August 2015 | — | — |
| Armitage Shanks | 1991 | — | — |
| Arrant Saudade | 2015 | — | — |
| Arrogant Destruktor | 2012 | — | — |
| Art & Language | 1967 | — | — |
| Art Brut | 2003 | — | — |
| Arx Atrata | 2010 | — | — |
| Arð | 2019 | — | — |
| As Dusk Falls | 7 November 2009 | — | — |
| As Elephants Are | 2011 | — | — |
| As Everything Unfolds | 2013 | — | — |
| Ash | 1989 | — | Northern Ireland alternative rock band |
| Asherah | 2012 | — | — |
| Asia | 1981 | — | UK progressive rock band |
| Asking Alexandria | 2006 | — | English metalcore band |
| Asomvel | 1993 | — | — |
| Astralasia | 1990 | — | — |
| Aswad | 1975 | — | British reggae group |
| Atlantic | 1991 | — | UK AOR Melodic Rock |
| Atramentum | 2011 | — | — |
| Attic Lights | 2005 | — | — |
| Attica's Ashes | 2012 | — | — |
| Attila the Stockbroker's Barnstormer | 1995 | — | — |
| Audience | 1969 | — | — |
| August Actually | March 2011 | — | — |
| Autoheart | 2011 | — | — |
| Automatics | 1977 | — | — |
| Avenger | 1982 | — | — |
| Average White Band | 1971 | — | — |
| AWAP | 2017 | — | — |
| Axegrinder | 1985 | — | — |
| AxeWound | 2011 | — | — |
| Axiom Shift | 2025 | — | — |
| Axis of Evil | 2003 | — | — |
| Axis of Light | 2011 | — | — |
| Aztec Camera | 1981 | — | 80/90's UK Group |
| B-Movie Britz | 1998 | — | — |
| Babe Ruth | 1971 | — | — |
| Babybird | 1995 | — | — |
| Babyshambles | 2003 | — | — |
| BACKSPACE | 1 January 2017 | — | — |
| Bad Ape | 2017 | — | — |
| Bad Boat | 2002 | — | — |
| Bad Manners | 1976 | — | UK ska band |
| Bad Taste | 12 October 2026 | — | — |
| Badfinger | December 1969 | — | — |
| Bal-Sagoth | 1993 | — | — |
| Balance of Power | 1995 | — | — |
| Baleful Creed | 2009 | — | — |
| Ballboy | 1997 | — | — |
| Bananarama | 1979 | — | — |
| Band of Skulls | 2004 | — | — |
| Barbed Wire | 1984 | — | — |
| Barclay James Harvest | 1966 | — | — |
| Bark Psychosis | 1986 | — | — |
| Basement | 9 September 2009 | — | — |
| Bastille | 2010 | — | British indie pop band |
| Battery Humans | April 2012 | — | — |
| Battle Born | 2018 | — | — |
| Ba’al | 2016 | — | — |
| BEAK> | 2009 | — | — |
| Bearfoot Beware | 1 September 2010 | — | — |
| Bearpit | May 2015 | — | — |
| Bear’s Den | 12 March 2012 | — | — |
| Beau and the Arrows | 27 March 2008 | — | — |
| Belle and Sebastian | January 1996 | — | — |
| Benediction | 1988 | — | UK death metal |
| Bentley Rhythm Ace | 1997 | — | — |
| Berlin Black | 30 April 2010 | — | — |
| Berlin Ritz | 1978 | — | hard rock band |
| Bette Davis & the Balconettes | 1989 | — | — |
| Beverley Kills | 9 August 2008 | — | — |
| Beyond Grace | 2005 | — | — |
| BFG | 1985 | — | — |
| Biere De Luxe | 1 February 2011 | — | — |
| Biffy Clyro | 1995 | — | — |
| Big Audio Dynamite | 1984 | — | — |