[1][2] In the next two decades they competed mostly in the Ljubljana League, which was the fifth or sixth level of Yugoslav football.

Factor was then relegated to third level, where they stayed until 2004, when they won the centre zone and defeated Korte in promotion play-off.

In 2007, Joc Pečečnik, one of the richest persons in Slovenia, took over NK Factor and renamed them to Interblock Ljubljana.

[6] In 2010, the club started to cooperate with NK Bravo and the team was renamed to IB Interblock.

In February 2012, Pečečnik, who has left the club after the 2011–12 season, intended to merge their youth selections with NK Bravo Publikum, but after the revolt from parents of the youth selections, the club has remained its own entity.