Nyköpings BIS was a merger in 1967 by Nyköpings AIK (Allmänna Idrottsklubb, en. public athletics club) and Nyköpings SK (Sportklubb, en. sports club). Those two clubs had often battled each other in the same league in the then second tier league, division 2, so in 1967 they joined forces as the Boll- och Idrottssällskap (en. appr. ball and athletic association) instead.
After 1967, Nyköpings BIS played in the second-level league until the leagues were redefined in 1975 with the inauguration of the Elitserien as the new top division. BIS didn't make it to the new slimmer second division (division 2 with eight leagues with about 100 teams was replaced by new division 1 with four leagues with 40 teams) and played in the new third-level league division 2 until the merger in 1990.
The newly founded NH90 won their league division 2 östra (east) B, and made it through play offs and a qualification league and was promoted to the second-level division 1. During their division 1 seasons they used to end up in the middle or bottom of the league, having to play qualification rounds to remain in the league at some point, but when the new second-level league Allsvenskan Norra/Södra (north/south) was inaugurated in the 1999/2000 season, Nyköping became a top team.
They finished fourth in the fall season of the north league and made it to the Superallsvenskan after the New Year, a league for the eight best teams. It had been around since the 1982/83 season, previously called Allsvenskan, then too for the eight best division 1 teams, i.e. two teams each from the four division 1 groups (north, east, west and south). (Furthermore, from 1987/88 to 1995/96 it was played with ten teams, with the two last teams in the Elitserien by New Year joining as well.)
Nyköping avoided the two last spots and got to continue with play offs for a possible Elitserien promotion and made it through both rounds and played in the final qualification league, kvalserien.
However, even before this season it had been questionable until not long at all before the start of the season whether the club would have the financial means to participate. They made it at the last moment and got a really good season, but the financial problems would more or less remain until the problems led all the way to relegation in 2008.
The team continued to often have good results in the league. They were promoted to the Superallsvenska after New Year in 2000/01 (winning the Allsvenskan Norra in the fall), 2001/02 and 2004/05. In the play offs they made it all the way to the Kvalserien once more in 2004/05.
In the 2005/06 season the two Allsvenskan leagues were combined into one league, the present HockeyAllsvenskan with sixteen teams. The first season only the four best teams were promoted to the Kvalserien directly, Nyköping came in on 11th place. From the 2006/07 season a play off was re-inaugurated, the top three teams are promoted to the Kvalserien directly, and the teams ranked 4 through 7 play each other in two play off rounds for the fourth spot. Nyköping came in on the 7th spot and beat the 4th team, VIK Västerås HK, in the first play off round, but lost in the next round to IF Björklöven.
In the 2007/08 season the financial situation in the club was really harsh, and a new board of the club fought persistently to get the affairs of the club in order to meet the financial demands for being approved to remain in the league. The team also fought for a long time in the bottom of the league, but finally made a 13th place, nine points ahead of the 15th team Huddinge IK, which then played in the qualification and relegation league and only came in third after two promoted teams from division 1, but would eventually be promoted on the relegation of Nyköping.
However, the financial situation was only solved almost all the way. Since the previous season the financial demands on clubs in Elitserien and HockeyAllsvenskan included the right to have a negative shareholders´ equity for one season, but not for two in a row. The club had a negative equity per April 30, 2007, and didn't manage to avoid the same thing also per April 30, 2008, and by these means, they did not meet up to all necessary demands to be approved to participate. The control board for these issues decided on June 11 that Nyköping could not be approved, and the Ice Hockey Association turned down an appeal from the club and decided on relegation on June 26. The club tried an appeal to the Riksidrottsnämnden (RIN), a deciding board within the National Sports Association. The RIN decided on July 17 that there were no formal faults in the decision made by the ice hockey association and that they would not look into the matter at all.
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