1970s |
| Founded | Band/project name | Members | Notes |
| 1970 | Emerson, Lake & Palmer[1] | | Albums: Emerson, Lake & Palmer, Tarkus, Trilogy, Brain Salad Surgery, and more |
| 1971 | Captain Beyond[2] | | Albums: Captain Beyond, Sufficiently Breathless, Dawn Explosion |
| 1971 | Matching Mole | | Albums: Matching Mole, Matching Mole's Little Red Record |
| 1973 | Badger | | Albums: One Live Badger, White Lady |
| 1974 | Refugee | | Albums: Refugee |
| 1974 | Armageddon | | Albums: Armageddon |
| 1975 | National Health | | Albums: National Health, Of Queues and Cures, D.S. Al Coda, Playtime |
| 1976 | 801 | | Albums: 801 Live, Listen Now, Manchester University |
| 1977 | U.K. | | Albums: U.K., Danger Money, Night After Night and more. |
| 1977 | Strontium 90 | | Albums: Strontium 90: Police Academy (released 1997) |
| 1978 | Soft Heap/Soft Head[3] | | Albums: Rogue Element, Soft Heap, A Veritable Centaur |
1980s |
| Founded | Band/project name | Members | Notes |
| 1981 | Asia[4][5] | | Albums: Asia, Alpha, Astra, and more |
| 1982 | In Cahoots | | Albums: In Cahoots Live 86-89, Digging In, Live in Japan, Recent Discoveries, Parallel, Out of the Blue, All That |
| 1983 | Moraz - Bruford | | Albums: Music for Piano and Drums, Flags |
| 1983 | News from Babel | | Albums: Work Resumed on the Tower, Letters Home |
| 1986 | GTR | | Album: GTR |
1990s |
| Founded | Band/project name | Members | Notes |
| 1991 | Short Wave | | Album: Short Wave Live |
| 1992 | The Chris Squire Experiment | | Toured, but released no albums. Later re-emerged as Conspiracy |
| 1997 | Bozzio Levin Stevens | | Albums: Black Light Syndrome, Situation Dangerous |
| 1997 | Explorers Club | | Albums: Age of Impact, Raising the Mammoth |
| 1997 | Rudess/Morgenstein Project | | Albums: Rudess/Morgenstein Project, The Official Bootleg |
| 1998 | Gordian Knot | | Albums: Gordian Knot, Emergent |
| 1998 | Liquid Tension Experiment | | Albums: Liquid Tension Experiment, Liquid Tension Experiment 2 |
| 1999 | Bruford Levin Upper Extremities | | Albums: Bruford Levin Upper Extremities, B.L.U.E. Nights |
| 1999 | Qango | | Album: Live in the Hood |
| 1999 | Planet X | | Albums: Universe, Live From Oz, MoonBabies, Quantum |
| 1999 | Transatlantic | | Albums: SMPT:e, Live in America, Bridge Across Forever, Live in Europe, The Whirlwind, Kaleidoscope |
2000s |
| Founded | Band/project name | Members | Notes |
| 2000 | Conspiracy | Guest musicians: | Albums: Conspiracy, The Unknown - Band began in 1992 as the Chris Squire Experiment
|
| 2000 | John Petrucci & Jordan Rudess | | Album: An Evening with John Petrucci and Jordan Rudess |
| 2002 | The Tangent | | Albums: The Music That Died Alone, The World That We Drive Through, A Place in the Queue |
| 2002 | 21st Century Schizoid Band | - Ian McDonald (King Crimson, Foreigner, McDonald and Giles)
- Jakko Jakszyk (Rapid Eye Movement, The Lodge, solo, later The Tangent)
- Mel Collins (King Crimson, Camel)
- Peter Giles (Giles, Giles and Fripp, King Crimson)
- Michael Giles (King Crimson, McDonald and Giles, Giles, Giles and Fripp)
| Albums: Official Bootleg V.1, Live in Japan, Live in Italy, Pictures Of A City — Live in New York |
| 2002 | Jelly Jam | | Albums: Jelly Jam, Jelly Jam 2, Shall We Descend |
| 2003 | OSI (Office of Strategic Influence) | Guest musicians: | Albums: Office of Strategic Influence, Free, Blood, Fire Make Thunder |
| 2004 | Altera Enigma | Former member: | Albums: Alteration |
| 2004 | The Sound of Animals Fighting | | Albums: Tiger and the Duke, Lover, the Lord Has Left Us..., The Ocean and the Sun |
| 2005 | White | | Albums: Loyal (unreleased) White (2006) |
| 2006 | Circa | | Album: Circa 2007 |
| 2007 | Amaran's Plight | | Album: Voice in the Light |
| 2007 | UKZ | | EP: Radiation |
| 2009 | Yoso | | Album: Elements |
| 2009 | Floating Me | | Album: Floating Me |
2010s |
| Founded | Band/project name | Members | Notes |
| 2012 | Flying Colors | | Albums: Flying Colors, Second Nature, Third Degree |
| 2014 | The Birds of Satan | | Album: The Birds of Satan |
| 2014 | The Mute Gods | | Albums: Do Nothing till You Hear from Me, Tardigrades Will Inherit the Earth, Atheists and Believers |
| 2017 | Sons of Apollo | | Album: Psychotic Symphony |
| 2017 | The Sea Within | - Roine Stolt (Kaipa, The Flower Kings, Transatlantic, The Tangent)
- Jonas Reingold (The Flower Kings, Kaipa, Karmakanic, The Tangent)
- Marco Minnemann (Mike Keneally, David Torn, The Aristocrats, Steven Wilson, The Mute Gods)
- Tom Brislin (Yes, Renaissance, later Kansas)
- Daniel Gildenlöw (Pain of Salvation, The Flower Kings, Transatlantic)
Guest and touring member: | Album: The Sea Within |
2020s |
| 2021 | Arc of Life | - Billy Sherwood (Lodgic, World Trade, Circa, Yes, Asia)
- Jon Davison (Glass Hammer, Yes)
- Jay Schellen (Hurricane, Unruly Child, Asia, World Trade, Circa)
- Jimmy Haun (Circa)
- Dave Kerzner (Sound of Contact, Sonic Elements)
| Album: Arc of Life |
Star coverbands |
| Founded | Band/project name | Members | Notes |
| 1993 | Spin 1ne 2wo | | The band covered classic rock songs by Jimi Hendrix, The Who, Led Zeppelin, Blind Faith, Steely Dan and Bob Dylan. |
| 2003 | Yellow Matter Custard | | The Beatles cover band. |
| 2006 | Hammer of the Gods | | Led Zeppelin cover band. |
| 2006 | Cygnus and the Sea Monsters | | Rush cover band. |
| 2007 | Amazing Journey | | The Who cover band. |
Abortive projects |
| Founded | Band/project name | Members | Notes |
| c. 1976 | British Bulldog[6] | | Rehearsed, but project fell apart. Some material later re-used on U.K.'s first album and on Rick Wakeman's Criminal Record. |
| 1980 | unnamed band | | Group proposed by Geffen Records, but Wakeman walked out before the band had ever played together; described in Wakeman's autobiography "Say Yes!".[7] |
| 1981 | XYZ | | Recorded demos; some material later re-used in other bands. |