| 1901 | Injustice | Jordan Oliver, Kotto Brazil, Myron Reed | 2019-2021 | | |
| 1902 | Inkognito | Argon, Geist, Samhein , William Fevik | 2013- | | |
| 1903 | Inner Circle | Denver Street, TLD, Tommy Thunda, Richard P. Guille | 2007-2009 | | |
| 1904 | Inner Circle | Justin Tyme, John Boy Justice, Mr. C , Louis G. Rich, Brandon Bishop , Christian York, Bazooka Joe, Ace Montana, Ryan Ross | 2011-2012 | | |
| 1905 | Inquisitorium | Ivan Sanzio, Michele Montana, Vittorio Bruni | 2023- | | |
| 1906 | Insane Punishment | Dave Payne, Sai, The Creeper | 2013-2016 | | |
| 1907 | Institution | Jack Banning, Brendan Divine, Honest John , Hunter Freeman | 2022- | | |
| 1908 | Insurgency | Ali Akbar/Mohammad Ali Vaez, Omar Akbar, Bin Hamin, Turcan Celik, Serena | 2007-2009 | | |
| 1909 | Insurgent.es | Carlos Vega /Carlos Vegan, Alex Ace, Oliver Turner, Tristan J. Charles/TJ Charles | 2017- | | |
| 1910 | Intellectual Properties | Alex Arion, Arch Kincaid, Max Bauer, Thomas Penmanship, Danielle Gibbs | 2005-2007 | | |
| 1911 | Intellectual Properties | Tommaso Ciampa, Max Bauer, Mike Nice | 2010-2010 | | |
| 1912 | International Alliance | Marco Corleone, Magno, Rocky Romero, Super Nova | 2011 | | |
| 1913 | International Assassions | Kunai Silencio, Gavilan De Plata, Golden Dragon | 2014- | | |
| 1914 | International Heat Seeking Riot Squad | Kaden Assad, Ron Mathis, Jeremy Madrox | - | | |
| 1915 | International House Of Pain | Ashley Sixx, Ethan Page, Mike Rollins, Alex Vega, Kaden Assad | 2011 | | |
| 1916 | International Mafia | Automata, Kamorra, Lio Napoles, Hank Davidson, Moghart | 2019-2020 | | |
| 1917 | International Playaz Club | Mike Foxx, C-Diddy, Chance Romance, Martin Styles, Jared Steele, Shadrick, Zane Morris, Eddie Atlas, Shadow , Brett Barnes, Wally Darkmon | 2005-2012 | | |
| 1918 | Intimidators | Jim Brannigan, Maxx Crimson, Mark Mest, Vladimir Vampyre, Troy Mest | 1992-2007 | | |
| 1919 | Invaders | Invader #1, Invader #3, Invader #4 | - | | |
| 1920 | Inversiones Santos | Alex Santos, Jarek, Pedro Pablo/Pedro Pablo Subercaseaux | - | | |
| 1921 | Investment | Aaron Henry, Curt Chaos, Daniel Burnell, Jakob Cross, Liam Fury/Fury , Pat Schisk, Vinny Dunn | 2014-2015 | | |
| 1922 | Irish Brotherhood | Dylan Cook, JP McGregor, Joshua O'Hagan, Ethan O'Hagan, Brandon Cash, O'Malley | 2021- | | |
| 1923 | Irish Underdogs | Bryan O'Reilly, Bulldog Turner, Ryan Donavon | 2022- | | |
| 1924 | Iron Curtain | Gregory Iron, Joey Vincent Martini, Benjamin Boone, Dick Justice, Christian Faith, Jerry | 2014-2017 | | |
| 1925 | Iron Mountain | Duke Swellington, Dutch Hagen, Jack Davenport | 2023- | | |
| 1926 | Iron Perms | Don Fujii, Second Doi, Naoki Tanizaki | 2004 | | |
| 1927 | Iron Saints | Brandon Thomaselli/Pauly Thomaselli, Sal Thomaselli, Vito Thomaselli, Junior Thomaselli | 2003-2010 | | |
| 1928 | Ishin Gundan | Riki Choshu, Masa Saito, Killer Khan, Animal Hamaguchi, Yoshiaki Yatsu, Isamu Teranishi, Killer Khan, Kuniaki Kobayashi, Tiger Toguchi | 1982-1987 | | |
| 1929 | Island Dynasty | Kaoz , Kona , Tiki Chamorro, Leia Makoa | 2022- | | |
| 1930 | Islanders | Haku, High Chief Afi, Tama | 1988-1988 | | |
| 1931 | It Girls | Jaylee, Cali/Cali Young, Valerie Vermin | 2018 | | |
| 1932 | Italian Connection | Milano Collection AT, YOSSINO, Anthony W. Mori, YASSINI, Condotti Shuji, Bakery Yagi/Pescatore Yagi, Berlinetta Boxer, Venezia | 2002-2005 | | |
| 1933 | Italian Connection | Andres Diamond, Carlo, Kobra | - | | |
| 1934 | Italian Four Horsemen | Antonio Honda, MORI Bernard, Francesco Togo, PIZA Michinoku, Sasaki and Gabbana, Don Maestro | 2005-2010 | | |
| 1935 | Italian Stallions | John Balsamo, Gino Martino, Gino Sabatino, Zack Carlucci | - | | |
| 1936 | J-Tex Corporation | Buzz Sawyer, Dick Slater, Gary Hart, Terry Funk, The Dragon Master, The Great Muta | 1989-1990 | | |
| 1937 | JAN | Jungle Kyona, Kaori Yoneyama, Natsuko Tora, Leo Onozaki, Ruaka, Saya Iida | 2018-2019 | | |
| 1938 | JB Enterprises | Joseph Brock III, Tetchi Makuji, Brian Kane, Damien Bennett, Drew Blood , Logan Creed, Jagged Edge, AC Mack, Xavier Reyes, Hunter James | 2015- | | |
| 1939 | JBE International | Hunter James, Tetchi Makuji, Xavier Reyes | 2022- | | |
| 1940 | JIN | Koji Iwamoto, Naoya Nomura, Ayato Yoshida, Fuminori Abe, Jake Lee | 2019-2021 | | |
| 1941 | JKO | Black Changita, Black Eagle , Black Chango, Black R, Black The Dragon, Black The Giant, BM | 2020-2021 | | |
| 1942 | JOB Security | Malcom Moss, Ronnie Moses, James Romer, Alex Lasko | 2017-2019 | | |
| 1943 | JOKER | Kuuga, Orochi, HAYATA, Spider J, The Bodyguard , Hideyoshi, Masamune, Quiet Storm | 2010-2013 | | |
| 1944 | JOKER | Kuuga, Gamerasu, Kazuaki Mihara, Masamune, Orochi/MIYAWAKI | 2013- | | |
| 1945 | JP Investments | Mark Gjoka, Bry Sullivan, Paul Bowser, Jonathan Presley | 2013 | | |
| 1946 | JTD Inc. | JT Davidson, Alex Colon, Chris Hall, Flex Jordan, Kyle Kraven, Clayton Jackson | 2015 | | |
| 1947 | Jack Of Love | Chest Flexor, Jack Verville, Jefferson Saint | 2009-2010 | | |
| 1948 | Jackets | Jiro Kuroshio, Yasufumi Nakanoue, Seiki Yoshioka | 2015-2016 | | |
| 1949 | Jackson 3 | Malachi Jackson, Matt Jackson, Nick Jackson | 2010 | | |
| 1950 | Jackson Family | Jed Johnson, Britt Jackson, Gene Jackson | 2015 | | |
| 1951 | Jadoshu | MARU, Bulldozer Todoroki, Allen, Kira An, Kyoka Iwai | 2022- | | |
| 1952 | James Gang | Drugz Bunny, James , Stoney Montana | 2012-2013 | | |
| 1953 | James Gang | Drugz Bunny, James C, Stoney Montana | 2013-2014 | | |
| 1954 | Jarocho Style | Tribal , Principe Halcon, Angel del Misterio , Paloma Rouse, El Demasiado | 2012 | | |
| 1955 | Jarrett Enterprises | Jeff Jarrett, Debra, Mark Henry, Miss Kitty | 1999-1999 | | |
| 1956 | Jaunak | Jauna, Jauna II, Jauna III | 2024- | | |
| 1957 | Jay-W-O | Jay /Jay Belmont, Fredo/Freddy Crow, Routo/Hell Routo | 2019-2021 | | |
| 1958 | Jerarquia | Barracuda , Jocoso Jr., Rafael Flores, Leon Dorado , Morthus, Xenomantis | 2015- | | |
| 1959 | Jersey Shore Crew | Danny Inferno, Nova, The Idol, Trudi DeNucci | 2004 | | |
| 1960 | Jesus Club | Ron Hunt, Zeke Mercer, AJ Alexander, BD Craft, Curtis Ray Goddi, Bryce Coleman | 2019- | | |
| 1961 | Jimmy Rave Approved | Jimmy Rave, Corey Hollis, Mike Posey, Chip Day, Patrick Bentley, Sal Rinauro | 2011-2014 | | |
| 1962 | John Hawkins Promotions | John Hawkins, Chris Richards, Chase Owens, Tom Prichard, Josh Cody, Jordan Kage, The Barbarian, Caleb Courageous, Bobby Eaton, Eric Darkstorm, Brian Logan, Cody Ices, Alyx Winters, Bryan Kyle, Derik Billings, Jason Kincaid, The Disciple | 2005-2012 | | |
| 1963 | Join The Murder | Gabriel Wolfe, Ritchie Taylor, Tyler Frost | 2017- | | |
| 1964 | Joint Army | Matsuya Uno, Rina Shingaki, Tae Honma, Cherry , Syuri | 2020-2021 | | |
| 1965 | Jolt Jokers | Asian Cougar, Yuki Nishino, The Great Takeru, Phantom Funakoshi | 1998-1999 | | |
| 1966 | JonesTown | Charli Rose, Dylan Daniels, Eddie Jones | 2018-2019 | | |
| 1967 | Juan Direction | Funny Juan, Giant Juan, Romantic Juan, Tough Juan, Juanita | 2016-2023 | | |
| 1968 | Judgement | Chase Stevens, Crimson, Jon Malus, Gunner, DOC | 2013 | | |
| 1969 | Juggalo Nation | Jay Jackal, Maximus Steele, PD Flex | 2006 | | |
| 1970 | Jungle Jack | Aja Kong, Bison Kimura, Kaoru Ito, Mika Takahashi, Sakie Hasegawa | 1990-1992 | | |
| 1971 | Jungle Jack 21 | Aja Kong, AKINO, Tomoka Nakagawa, Hiroyo Matsumoto, Ran YuYu | -2012 | | |
| 1972 | Junk Squad | Chris Jordan, Pete Huge, Horace The Psychopath | 2006 | | |
| 1973 | Junk Squad | Chris Jordan, Pete Huge, Kleck Michaels | 2007-2008 | | |
| 1974 | Junretsu | Jun Akiyama, Hideki Okatani, Makoto Oishi, Yusuke Okada, Mizuki Watase | 2020-2021 | | |
| 1975 | Jury | Carson Bailey, The Disciple , The Judge | 2017-2019 | | |
| 1976 | Just Business | Vinnie Vain, Banks & Piers Austin | 2022- | | |
| 1977 | Just Us League | ACH, Just Willie, Slim Sexy | 2011 | | |
| 1978 | Justice | Fynn Freyhart, Michael Knight, Ryan Klarc/Red Baron | 2022- | | |
| 1979 | Justice And Glory | Barabas, Jason Hell, Mr. Brown | 2004-2007 | | |
| 1980 | Justice League Of Vanguard | Isaias Velazquez, Jordan Pryde, Amazing Kuan, Ovirload | - | | |
| 1981 | Justice N Glory | Barabas, Jason Hell, Mr. Brown | 2008- | | |
| 1982 | K5 | Mr. Vega , Arson Blaze, Vinny Ramaguchi, Daniel Modem, Andrew D. Dawson, K-Cling | 2011-2012 | | |
| 1983 | KAMIKAZE USA | SHINGO, YAMATO, Jon Moxley, Gran Akuma, Akira Tozawa | 2010-2011 | | |
| 1984 | KAOS | Scorpio, Bison Smith, Doug Williams, Vader, Richard Slinger, Michael Modest, Donovan Morgan, The Gladiator, Bull Schmitt | 2003-2006 | | |
| 1985 | KAPS | Jimmy Jamal Jenkins, John Dozer, Michael Morleone | 2013-2015 | | |
| 1986 | KAYFABulous | Ginger , Chest Flexor, JD Browning, Derek Direction | 2015-2016 | | |
| 1987 | KGH | Kiai Ryuuken Ecchan, Hiroto Okubo, Genki Yamada, Tomo Enami | 2019- | | |
| 1988 | KISSmeT PRINCESS | Nao Ishikawa, Misa Kagura, Rina Amikura/Amin | 2022-2023 | | |
| 1989 | KOA | Aaron Epic, Sugar Dunkerton, Pinkie Sanchez, Taka Suzuki | 2011-2014 | | |
| 1990 | KOS | Brandon Parker, Mondo Vega, Tim Lovato | - | | |
| 1991 | KPK | Abu , Ahmed , Harun, Karou | 2022- | | |
| 1992 | KUSH | Kris Chambers, Lionel Knight, Phil Atlas, Preston Myles/Young Myles, San Andres, Roach | 2015- | | |
| 1993 | KYS | MK McKinnan, Damian Dunne, Pete Dunne, Jimmy Havoc | 2014-2016 | | |
| 1994 | Kabal | M.Shay Ultra/Shay Purser, Asmodeus , Azaroth, Musmortus, Diabolos | 2019- | | |
| 1995 | Kaientai USA | Donny Brookes, Dylan Dunbar, Dillon Divine, Tadasuke | 2014 | | |
| 1996 | Kalakos VIP | Aereo , Pagano, Centinela | 2014- | | |
| 1997 | Kansas City Killers | Jeremy Wyatt, Mark Sterling, Bradley Charles, Mike Sydal | 2009-2013 | | |
| 1998 | Kaos | Lukas Skott, Hades , Tony Gatusso, Blacksmith , Syvil Vane, Rod Zayas, Koajim Echevarria, Paolo I, Ruky, Michelle M | 2011-2012, 2013-2015 | | |
| 1999 | Karachi Vice | The Great Gama/Gama Singh, Makhan Singh, Steve DiSalvo, Vokhan Singh, Kerry Brown, Ron Starr, JR Foley | 1986-1989 | | |
| 2000 | Kardinal Sinners | Acadian Giant, Bobby Rude, Brody Steele/Kingman, Gary Williams, Mike Hughes | 2005- | | |
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