CLS Knights first competed in the Indonesian Basketball League in 2003. They never won the IBL title from their inaugural season until 2010 when the league changed their name to the National Basketball League. On the league's first season as the NBL in 2010-11, the Knights reached the league finals for the first time losing to eventual champions, Satria Muda BritAma.
Dimaz Muharri era (2011–2013)
Dimaz is a carrier of change for CLS Knights Surabaya. Although he has never won the NBL in his career, Dimaz had garnered individual awards such as being the player with the Top Steal and Assist. The Knights' best finish with Dimaz was 3rd place.
"Big 2 Point Guards" (2013–2015)
CLS brought in Mario Wuysang who played with the Indonesia national basketball team as a point guard. Wuysang was reportedly the NBL player with the highest salary. Wuysang was paired with Dimaz. In 2015, the league reverted to its old name.
Five of them were brought CLS in the heyday by winning the IBL Indonesia for the first time. Jamarr came to Indonesia in 2014 and began playing in 2015. Not only that Sandy and Mario is the Indonesian national team players in the event the SEA Games 2015. Plus Thoyib return from retirement to make the CLS more intense. Febri which is a player in the Indonesia SEA Games in 2013 also made great contributions. Johnson was recognized as the Most Valuable Player, Rookie of the Year, Top Scorer Awards in the IBL while Wuysang was recognized as the player with the Most Assists. However, just after the 2017 IBL Indonesia season, the Knights pulled out of the league, citing a new rule change as one of the main reasons for their departure.
After pulling out from the IBL, the Knights subsequently announced their entry to the ASEAN Basketball League, being one of the four new teams to enter the league in the 2017–18 season of the league. The Knights will be the first Indonesian team to join the league since the 2014 ABL season, when the Indonesia Warriors and Laskar Dreya South Sumatra last played in the pan-ASEAN league. The team will play under the name "CLS Knights Indonesia" in the ABL. But during the ABL 2018-2019 mid season, on 11 January 2019 they announced their name change to "BTN CLS Kngihts" upon signing deal of sponsorship with BTN Bank. The Knights Finished the 2018-2019 ABL Season as the ABL Champion after defeating the Singapore Slingers in 5 games, Maxie Esho won the finals MVP after dropping 25 points in game 5.
ASEAN Basketball League Champions (2019)
CLS Knights won against Singapore Slingers with spectacular fashion in their home arena at OCBC Arena in Singapore, they took the championship after a 2–2 rally with Singapore Slingers. During the 2017–2018 season, the CLS Knights did not even make the playoffs, started off the season with 2–7. Eventually, CLS Knights finished off the season by winning 15 and losing 11, giving them the fourth seed in the playoffs. The first round took off on March 31, giving CLS Knights the 2–1 sweep. The Second round began, the hardest challenger CLS has faced off in the playoffs; CLS Knights took over the game with another 2–1 sweep. The Finals began, CLS Knights was not expecting any spectacular results knowing that Jerran Young will be playing in the final. The first game went on, CLS taking game 1 at OCBC Arena; eventually, the lost the next 2 games at OCBC Arena and GOR Kertajaya Surabaya. The second home game of CLS Knights is where they shine their power again, taking the game 87–74. The final game, it is the most intense game so far in the playoffs, especially for a CLS Knights fan. CLS Knights were struggling during the first half, they eventually found their rhythm and performed a spectacular comeback and taking the game. The CLS Knights was declared the champion of the ASEAN Basketball League champion of the 2018–2019 season. Soon after that they announced that they won't be playing in ABL 2019-2020 season
