The 2025–26 B1 League season, also known as the for sponsorship reasons, is the tenth season of the B1 League, the top Japanese professional basketball league, since its establishment in 2015. It was also the final season under the promotion and relegation setup, as the league structure will change in the 2026–27 season, with the B1 division becoming the B.League Premier.
Utsunomiya Brex are the defending champions, having won their third B.League title after defeating the Ryukyu Golden Kings in the 2025 finals.
Changes from last season Format The teams will now be split between two conferences instead of three as in previous seasons.
Team changes Altiri Chiba and Toyama Grouses were promoted from the B2 League. Relegation from the B1 League was suspended last season as part of the lead up to the upcoming league reformatting.
Teams
Regular season Standings (As of May 3rd, 2026)
# East Division 1 Utsunomiya Brex 60 45 15 — 2 Chiba Jets 60 42 18 3 3 Gunma Crane Thunders 60 42 18 3 4 Alvark Tokyo 60 41 19 4 5 Levanga Hokkaido 60 37 23 8 6 Sendai 89ers 60 35 25 10 7 Yokohama B-Corsairs 60 26 34 19 8 Sunrockers Shibuya 60 25 35 20 9 Koshigaya Alphas 60 21 39 24 10 Ibaraki Robots 60 19 41 26 11 Altiri Chiba 60 19 41 26 12 Kawasaki Brave Thunders 60 16 44 29 13 Akita Northern Happinets 60 10 50 35
# West Division 1 Nagasaki Velca 60 47 13 — 2 Seahorses Mikawa 60 43 17 4 3 Ryukyu Golden Kings 60 42 18 5 4 Nagoya Diamond Dolphins 60 41 19 6 5 San-en NeoPhoenix 60 36 24 11 6 Saga Ballooners 60 32 28 15 7 Hiroshima Dragonflies 60 31 29 16 8 Shimane Susanoo Magic 60 28 32 19 9 Osaka Evessa 60 23 37 24 10 Shiga Lakes 60 23 37 24 11 Kyoto Hannaryz 60 20 40 27 12 Toyama Grouses 60 18 42 29 13 Fighting Eagles Nagoya 60 18 42 29
B1 League clubs in Asian competitions Team Competition Progress Result Utsunomiya Brex Basketball Champions League Asia Group stage Loss vs. Meralco Bolts 4–1 Win vs. Shabab Al Ahli Quarter-finals 2OT Win vs. Tabiat Semi-finals Win vs. Ulaanbaatar Xac Broncos Final Win vs. Al RiyadiEast Asia Super League Group stage OT Loss vs. Taipei Fubon Braves 7–2Win vs. Seoul SK KnightsLoss vs. Seoul SK KnightsWin vs. Hong Kong EasternWin vs. Hong Kong EasternWin vs. Taipei Fubon BravesQuarter-finalsWin vs. New Taipei KingsSemi-finalsWin vs. Ryukyu Golden KingsChampionshipWin vs. Taoyuan Pauian Pilots Alvark Tokyo Group stage Loss vs. Ulaanbaatar Xac Broncos 5–3Win vs. New Taipei KingsWin vs. Changwon LG SakersWin vs. Changwon LG SakersWin vs. New Taipei KingsWin vs. Ulaanbaatar Xac BroncosSemi-finalsLoss vs. Taoyuan Pauian PilotsThird placeLoss vs. Ryukyu Golden Kings Ryukyu Golden Kings Group stage Loss vs. Taoyuan Pauian Pilots 6–2Win vs. Meralco BoltsWin vs. Macau Black BearsWin vs. Macau Black BearsWin vs. Taoyuan Pauian PilotsWin vs. Meralco BoltsSemi-finalsLoss vs. Utsunomiya BrexThird placeWin vs. Alvark Tokyo
B1 League clubs in International competitions Team Competition Progress Result Utsunomiya Brex Intercontinental Cup Group stage Loss vs. Unicaja 0–3 Loss vs. Al Ahli Tripoli Fifth place Loss vs. Illawarra Hawks
References