| Jimmy the Squirrel | 2005 | — | — |
| Joe Lean & The Jing Jang Jong | 2007 | 2010 | — |
| Johnny Boy | 2002 | 2006 | — |
| Johnny Foreigner | December 2005 | — | — |
| Johnny Truant | 2002 | 2008 | — |
| Just Add Monsters | 2008 | — | — |
| Just By Chance | 9 September 2009 | 1 June 2014 | — |
| Kade Storm | 2003 | — | — |
| Kairi | 2002 | — | — |
| Kaiser Chiefs | 2003 | — | — |
| Keith | 2002 | October 2009 | — |
| Kenelis | 5 June 2003 | — | — |
| Kid Canaveral | 2005 | — | — |
| Kids in Glass Houses | 5 May 2004 | 31 October 2014 | — |
| Kilnaboy | 2003 | — | — |
| Kinch | 2007 | — | — |
| Kinesis | 2000 | 2005 | — |
| Klaxons | 5 November 2005 | 31 January 2015 | — |
| Knifeworld | 2009 | — | — |
| Koobors Law | 2007 | — | — |
| Kubb | 2005 | 2006 | — |
| Ladyfuzz | March 2004 | 5 April 2007 | — |
| Late of the Pier | 2004 | — | — |
| Lawson | 2009 | — | — |
| Lentil | 2003 | 2009 | — |
| Lesbian Bed Death | 2004 | — | — |
| Liam Frost and the Slowdown Family | 2003 | — | — |
| Lifeless | 2006 | — | — |
| Likes Lions | 15 November 2009 | — | — |
| Little Comets | 2008 | — | — |
| Little Man Tate | September 2005 | 13 July 2009 | — |
| Livingston | 2002 | — | — |
| London Grammar | 2009 | — | An English indie pop and electronic trio formed in Nottingham, England, in 2009. |
| Longview | 2001 | 2015 | — |
| Lower Than Atlantis | 19 August 2007 | 11 May 2019 | — |
| Lvcifyre | 2007 | — | — |
| Lyrian | 2006 | — | — |
| Lyrinx | 2004 | — | — |
| Madam | 2004 | — | — |
| Mafafi | 2005 | — | — |
| Magenta | 2001 | — | — |
| Make Model | October 2006 | December 2008 | — |
| Male Bonding | 2007 | — | — |
| Mallory Knox | 2009 | — | — |
| Man Must Die | 2002 | — | — |
| Marconi Union | 2002 | — | — |
| Marmozets | 1 June 2006 | — | — |
| Martin Turner’s Wishbone Ash | 2005 | 19 February 2014 | — |
| Max Raptor | 2006 | — | — |
| Maxïmo Park | 2000 | — | English alternative rock band |
| Maybeshewill | 2005 | — | — |
| McFly | 2004 | — | English pop band |
| Mediatrocity | 2008 | 2011 | — |
| Meet Me in St. Louis | 2005 | 2008 | — |
| Midas Fall | 2 August 2008 | — | — |
| Middle Finger Salute | 2005 | 2014 | — |
| Mike TV | 2008 | — | — |
| Minus the Intention | 23 September 2009 | — | — |
| Misery Addict | 6 October 2009 | — | — |
| Moloch | 2007 | — | — |
| Monkey Swallows the Universe | January 2003 | 2008 | — |
| Monuments | 2007 | — | — |
| Morgue Orgy | 1 January 2008 | 2015 | — |
| Morning Runner | 2003 | 2007 | — |
| Moss | 2001 | — | — |
| Mount Fabric | 2007 | — | — |
| Mugstar | August 2001 | — | — |
| Mumford & Sons | December 2007 | — | — |
| Mutant | 2004 | — | — |
| My Sad Captains | 2004 | — | — |
| My Soliloquy | 2002 | — | — |
| Mystery Jets | 2004 | — | — |
| Necronoclast | 2003 | 2013 | — |
| Neon Neon | March 2008 | — | — |
| Nervosa | 15 August 2006 | — | — |
| New Young Pony Club | 2004 | — | — |
| NightMare World | 2006 | — | — |
| Nizlopi | 2003 | 2015 | — |
| Noah and the Whale | 2006 | 1 April 2015 | — |
| Nocturnal Necropsy | 2002 | — | — |
| Noise Agents | October 2008 | — | — |
| Noisettes | 2003 | — | — |
| North Sea Radio Orchestra | 2002 | — | — |
| Oakenshield | 2007 | — | — |
| Old Corpse Road | 2007 | — | — |
| Ommadon | 2008 | — | — |
| Oswald | 15 May 2005 | — | — |
| Out of Sight | 2001 | 24 January 2011 | — |
| Outl4w | May 2004 | — | — |
| Padded Cell | 2002 | — | — |
| PagesEND | 2005 | — | — |
| Pale Mist | 2007 | 2022 | — |
| Panic Room | 2005 | — | — |
| Pantheist | 2000 | — | — |
| Part Chimp | 2000 | — | — |
| Peace | 2009 | — | — |
| Pendleton | 2001 | — | — |
| Pet Slimmers of the Year | January 2008 | — | — |
| Pete & the Pirates | 2006 | 2012 | — |
| Phase | 16 December 2004 | — | — |