오스트루 비엘코폴스키

In 2015, Stal promoted from the second-tier I Liga to the PLK. In its first season, the team finished 13th in the standings with a 12–20 record. In the 2016–17 season, Stal had a historic season as the team reached the semi-finals of the PLK after defeating MKS Dąbrowa Górnicza 3–0 in the quarter-finals. In the semi-finals, Stal lost to Stelmet Zielona Góra but won the third place series against Energa Czarni Słupsk.

In the 2017–18 season, Stal had an even more successful season as the team reached the PLK finals for the first time after defeating Polski Cukier Toruń. In the Finals, the team lost to Anwil Włocławek, 2–4.

In 2019, Stal won the Polish Basketball Cup after defeating Arka Gdynia 77–74 in the final. It was the first ever trophy for the club.

In the 2020–21 season, Stal played in the FIBA Europe Cup and reached the Final Four of the tournament. It reached the finals were it lost to Israeli club Ironi Ness Ziona. Later that season, Stal won the finals of the 2020–21 PLK season, winning its first Polish championship in club history. Guard Jakub Garbacz was named the PLK Finals MVP.

New era started in 2022 when previous assistant Andrzej Urban was promoted the head coach. Team management reoriented its roster composition philosophy, focusing more on European foreigners. With players like Aigars Šķēle, Ojārs Siliņš and Nemanja Đurišić Stal hit the bullz-eye, winning its first Polish Supercup. By winning European North Basketball League, Stal won its first international title. Urban's debut season ended with bronze in the Polish league. Before his second season with the team, Latvian international Šķēle became the first ever current state Stal Ostrów Wielkopolski player in the FIBA Basketball World Cup.