All Underground Fighting Organizations Ranked: The Definitive List
The underground fighting scene in 2026 spans four continents, dozens of promotions, and every format from sanctioned bare knuckle boxing to no-rules brawling on concrete to 27-on-27 medieval football in a Florentine piazza. Some of these organizations operate under state athletic commissions with medical staff and drug testing. Others operate in abandoned warehouses with encrypted messaging apps and anonymous organizers. What unites them is their existence outside the mainstream combat sports establishment -- the UFC, PFL, ONE Championship, and the major boxing promotions.
This ranking evaluates every notable underground and bare knuckle fighting organization covered on this site. The criteria include competitive legitimacy, fighter safety, production quality, cultural impact, talent depth, audience reach, and the overall quality of the product as a fighting operation. Organizations are ranked from 23 to 1.
23. Holmgang (Modern)
Location: Hamburg, Germany (spread across Europe) | Format: Full-contact fighting with medieval weapons
Holmgang sits at the bottom of these rankings not because it lacks cultural interest but because it represents the most extreme risk in organized combat. Fighters compete with custom-made bladed weapons -- swords and battle axes -- wearing minimal safety gear, often just T-shirts. The potential for deep lacerations, permanent injury, or death places Holmgang in a category of its own.
Named after the historical Norse dueling practice outlawed in Iceland in 1006 and Norway in 1014, modern Holmgang exists in a legal gray area that makes even KOTS look regulated by comparison. Its ranking reflects the reality that an organization whose primary format involves sharp weapons cannot reasonably be evaluated alongside promotions where participants fight with their fists.
22. Felony Fights
Format: DVD series (6 volumes, 2005-2006) | Tagline: "No Cops. No Rules. No Mercy." | Status: Defunct
Felony Fights was a controversial DVD series featuring no-rules fights between felons, gang members, and street fighters. The series' exploitative premise -- filming convicted criminals fighting in uncontrolled environments -- and its "No Cops. No Rules. No Mercy." tagline represent the lowest point of commercialized underground fighting. The series retains a cult following through the Internet Archive but offers nothing of competitive value.
Felony Fights ranks near the bottom because it had no competitive structure, no safety protocols, and no legitimate sporting purpose. It was content exploitation dressed as combat sports.
21. FPVS
Location: French Riviera, France | Format: No rules, no gloves, concrete surface
FPVS is France's no-rules concrete fighting movement, operating under the same rules as the KOTS movement but as an unaffiliated entity. Founded by Leon and Victor, FPVS recruits through Telegram and draws primarily from young men aged 18-25. The organization features cultural rituals like national anthems and hand-wrapping ceremonies that lend an air of respect to the proceedings.
FPVS ranks low because it is still establishing itself, has limited public visibility, and operates in the most dangerous format without the established infrastructure that KOTS has built over a decade.
20. UUF (Ultimate Underground Fights)
Location: Denmark | Format: No-rules, bare-knuckle cage fighting | Affiliation: Hype Crew / KOTS
UUF Denmark operates out of abandoned warehouses and industrial halls, hosting up to 100 spectators per event with locations communicated through encrypted messaging. As a Hype Crew affiliate listed on the KOTS website, UUF brings the no-rules fighting movement to Denmark.
UUF's exposure through the "Undergrunden: Den danske fightclub" podcast brought it to wider public attention. However, its secretive nature, small scale, and limited competitive structure keep it near the bottom of these rankings. It functions effectively as a feeder system for KOTS rather than a standalone competitive entity.
19. Valor Bare Knuckle (VBK)
Location: United States | Format: Bare knuckle boxing
Valor Bare Knuckle operates in the long shadow of BKFC, serving regional fighter pools through an Instagram-first promotional model. VBK fills a legitimate gap -- the American bare knuckle market is too large for any single organization to monopolize -- but its limited event schedule and minimal public visibility beyond social media keep it in the lower tier.
18. Spartan BK Fight Club
Location: North England, UK | Format: Bare knuckle boxing, 8x8 hay bale ring
Spartan BK holds the distinction of being the only licensed hay bale fight club in the United Kingdom. The compact fighting space and rural English tradition it draws from give it a unique identity within the crowded UK bare knuckle scene.
17. Bad To The Bone (BTTB)
Location: Stoke-on-Trent, UK | Format: Bare knuckle boxing
BTTB serves the Midlands bare knuckle community from Stoke-on-Trent, a post-industrial city whose working-class identity produces fighters naturally. Regional focus limits its reach but provides a stable community foundation.
16. East Bay Rats Fight Night
Location: Oakland, California | Founded: 1996 | Format: Boxing at a motorcycle clubhouse
East Bay Rats Fight Night is one of the longest-running grassroots fighting operations in the United States. Founded by Trevor Latham's motorcycle club on San Pablo Avenue in Oakland, the event has operated since 1996 under the slogan "Support Consensual Bloodshed." The cultural significance of a motorcycle club hosting community boxing events for three decades earns it respect despite its small scale.
15. Mahatch Fighting Championship
Location: Kyiv, Ukraine | Founded: 2020 | Events: 9 | Status: Inactive
Mahatch FC achieved genuine quality in its brief existence: sandbag ring, mandatory jeans-and-sneakers aesthetic, Parimatch sponsorship, and talent including Artem Lobov and Denys Berinchyk. The Russian invasion of Ukraine in February 2022 forced the promotion into hiatus. Nine events and 227,000 YouTube subscribers represent real accomplishment. Inactive status limits its current ranking, but Mahatch's body of work punches well above what most small promotions achieve.
14. Backyard Squabbles
Location: South Los Angeles, California | Founded: 2020 | Motto: "Guns Down, Squabble Up"
Backyard Squabbles represents the growing LA backyard fighting scene. Founded during COVID-19 by Damian "DGoot" Gutierrez and Joshua Brito, the organization operates out of a gym in Carson, California, and has secured a broadcast deal with TrillerTV. The "Guns Down, Squabble Up" mission echoes Streetbeefs' community philosophy. Backyard Squabbles ranks here because it is still in its growth phase, but TrillerTV distribution gives it a legitimate pathway to expansion.
13. Underground Combat League (UCL)
Location: New York City (Bronx) | Active: 2003-2016 | Format: Unsanctioned MMA / Vale Tudo | Status: Defunct
The UCL holds a legendary place in MMA history. Founded and operated by Peter Storm, the invitation-only fight club ran 40-plus events over 13 years in the Bronx, producing notable alumni including future UFC champion Frankie Edgar. The UCL closed in 2016 when New York legalized MMA, rendering its underground purpose obsolete. Its historical significance and alumni pedigree earn it a mid-table ranking despite its defunct status.
12. Calcio Storico Fiorentino
Location: Florence, Italy | Origins: 16th century | Format: 27 vs. 27, 50-minute matches on sand
Calcio Storico is a 500-year-old Florentine sport that combines rugby, soccer, and bare knuckle fighting in Piazza Santa Croce. Twenty-seven players per side compete in 50-minute matches where head-butting, punching, elbowing, choking, and tackling are all legal. Four neighborhood teams -- Santa Croce, Santo Spirito, Santa Maria Novella, and San Giovanni -- compete annually during the third week of June.
Calcio Storico ranks in the middle because it is not a fighting promotion in the traditional sense. It is a historical sporting tradition that has survived for five centuries. Its competitive format, cultural significance, and sheer spectacle earn it respect that transcends conventional combat sports evaluation.
11. King of the Ring (KOTR)
Location: Manchester, UK | Founded: 2021 | Format: Boxing with gloves, 3 rounds x 1 minute
King of the Ring has grown rapidly since its 2021 founding by Remdizz in Manchester. Operating under an anti-knife-violence mission -- "PUT DOWN THE KNIFE, USE YOUR LEFT AND RIGHT" -- KOTR stages gloved boxing events with short rounds that produce fast-paced, action-packed cards. Over 100,000 YouTube subscribers and events expanding to Birmingham and Amsterdam demonstrate real growth. The community mission and entertaining format position KOTR for continued expansion.
10. UBKB (Ultimate Bare Knuckle Boxing)
Location: Warrington, UK | Broadcast: Channel 4, Channel 5, Netflix
UBKB is the most institutionally legitimate bare knuckle operation in the United Kingdom. Broadcast deals with Channel 4, Channel 5, Spike TV, and Netflix, sanctioning through the WSBKB, and a dedicated training academy in Warrington provide infrastructure that most UK promotions lack. Owner Shaun Smith's Netflix profile brings additional visibility. UBKB is a fully professionalized operation that brings British bare knuckle its most credible platform.
9. Rough N' Rowdy
Location: West Virginia (primary) | Founded: 1996 | Platform: PPV via BuyRnR.com | PPV Price: $29.99
Rough N' Rowdy is the Barstool Sports-promoted amateur boxing series that has turned West Virginia's fighting culture into a national entertainment brand. Founded by Christopher MacCorkle Smith in 1996 and acquired by Barstool in 2017, RNR stages three-round amateur boxing bouts with no headgear requirement. Peak PPV buys of 41,000-plus per event and commentary by Dave Portnoy and Big Cat give it mainstream reach that most underground organizations can only dream of.
8. Gamebred Bareknuckle MMA
Location: Miami, Florida | Founder: Jorge Masvidal | Tournament Prize: $500,000
Gamebred fills a unique niche as the world's first professional bareknuckle MMA promotion. The Unified Rules of MMA without gloves, $500,000 tournament prizes, and a roster featuring former UFC champions make it one of the most talent-rich operations in the space. Eight events deep and still growing, Gamebred's ceiling is among the highest of any promotion on this list.
7. King of the Streets (KOTS)
Location: Gothenburg, Sweden (events across Europe) | Founded: 2013
KOTS birthed the modern no-rules fighting movement and remains its most extreme expression. Founded by the anonymous Hype Crew, KOTS stages fights on concrete with no gloves, no rounds, and virtually no rules. The YouTube channel peaked above one million subscribers. The cultural impact -- spawning imitators across Europe including UUF, FPVS, and dozens of unaffiliated clubs -- is enormous. KOTS ranks seventh because its competitive product, while extreme, is genuine and has produced fighters like Simon Henriksen who are recognized on global P4P lists.
6. BKB Bare Knuckle Boxing
Location: Miami, Florida | Broadcast: VICE TV, Telemundo, talkSPORT | Events: 51+
BKB is the clear number-two bare knuckle promotion in the world. The patented Trigon ring, transatlantic broadcast deals, 51-plus numbered events, and a roster featuring top-ten P4P fighters make it the most credible challenger to BKFC's dominance. The February 2025 rebrand signals long-term ambition.
5. The Scrapyard
Location: Gig Harbor, Washington | Founded: 2020 | Instagram: 1.8 million followers | YouTube Views: 540 million+
The Scrapyard is the most successful offspring of the Streetbeefs movement. Founded by Steve "Fire Chicken" Hagara, the Pacific Northwest operation has grown to 1.8 million Instagram followers and over 540 million YouTube views. Up to 50 fights per day during summer events. Collaborations with iShowSpeed. The Foundation Media Partners deal signed in January 2026 marks a transition from grassroots fight club to professional media property. The Scrapyard has mainstreamed backyard fighting more effectively than any other organization in its weight class.
4. Top Dog Fighting Championship
Location: Moscow, Russia | Founded: 2020 | Venue: CSKA Arena
Top Dog FC is the largest bare knuckle promotion in Eastern Europe. Six weight classes, sold-out arena events at CSKA Arena, a championship structure, and elite talent including Naim Davudov (#6 global P4P) make it a legitimate powerhouse. The hay bale ring, jeans-and-sneakers dress code, and pandemic-to-arena growth story are compelling. Top Dog ranks fourth overall because its production quality, competitive structure, and talent depth rival anything in the bare knuckle world.
3. Strelka
Location: St. Petersburg, Russia | Founded: 2011 | YouTube: 2.45 million subscribers, 1.5 billion+ views | Participants: 40,000+ global roster
Strelka is the biggest fight club in the world -- not by hype, but by numbers. Over 10,000 participants across Russia and the CIS, a virtual roster exceeding 40,000 fighters globally, and a YouTube presence that ranks second only to the UFC in combat sports viewership. The concept is elegantly simple: an outdoor sand ring, no rounds, no time limits, amateurs only, fight until someone stops. Strelka achieves peak cultural relevance by being radically democratic -- anyone can fight, from truck drivers to sushi chefs. The viral phenomenon of Andrei Petrantsov -- a truck driver whose single-punch knockout has been viewed over 24 million times -- embodies everything Strelka represents.
2. Streetbeefs
Location: Harrisonburg, Virginia | Founded: 2008 | YouTube: 4.2 million subscribers, 1.3 billion+ views
Streetbeefs is the most influential backyard fighting organization in the world. Founded by Chris "Scarface" Wilmore on the premise of "fists up, guns down," Streetbeefs has grown from a community conflict resolution initiative to a 4.2-million-subscriber cultural phenomenon profiled by ESPN, The New York Times, The Washington Post, and The New Yorker. It has produced fighters who transitioned to professional careers (ATrain to BKFC, Delvin Hamlett to Rough N' Rowdy and Power Slap) and spawned affiliate organizations like The Scrapyard. Streetbeefs ranks second overall because its cultural impact, community mission, talent development, and audience reach are matched only by BKFC.
1. BKFC (Bare Knuckle Fighting Championship)
Location: Philadelphia, PA | Founded: 2018 | Events: 142+ | Valuation: ~$400 million
BKFC is the undisputed king of bare knuckle and underground fighting. Conor McGregor as part-owner. A $400 million valuation. Over 142 events. KnuckleMania VI drawing 18,217 fans. Broadcast across 60-plus countries. The deepest roster in bare knuckle history, led by Austin Trout, Mike Perry, Christine Ferea, Luis Palomino, and Eddie Alvarez. State athletic commission sanctioning. Medical protocols and drug testing. A $25 million tournament. No other organization in the underground or bare knuckle space comes close.
Methodology
Organizations were ranked on competitive legitimacy, fighter safety, production quality, cultural impact, talent depth, audience reach, financial stability, and overall product quality. Active organizations are generally ranked higher than defunct ones, but historical significance (UCL, Felony Fights, Calcio Storico) and interrupted potential (Mahatch) are accounted for. The rankings reflect the state of the underground fighting ecosystem as of March 2026.