Therefore, members of Fredericia Studenternes Kricketklub and Polyteknisk Boldklub were convened on February 26, 1889, for a joint meeting between the two clubs in order to arrange a merger.

On April 27, 1889, AB won the Danish Football Association's first tournament, defeating the until then invincible club Københavns Boldklub.

[2] Football was not yet played at schools at the time, and AB therefore started a junior department with the intention of recruiting talented young players.

The committee collected DKK 60,000 for the financing of the facilities, which came primarily from interest free bond loans from supporters of the club.

In 1911, Københavns Idrætspark was completed and the facility became home to theDenmark national team and several Copenhagen football clubs, including AB.

[2] AB's football game developed drastically as the club went from the uneven grounds they had played on so far to good fields on the new facilities.

In 1912, the poor results reached a new low point when AB ended last in the domestic tournament and had to play a relegation match against Østerbros Boldklub.

[2] During the years on Østerbro, AB and BK Frem collaborated on arranging so-called "English matches", as KB and B93 had also done it where professional foreign clubs were invited to a football tournament in Copenhagen.

The committee experienced great support from many well-known people in the academic world, which helped raise awareness about the need for funding.

[2] At the end of the 1920s, the number of members in the youth department increased steadily, and AB began to level divide the teams.

With a strong coach team led by Carl "Skomager" Hansen, the youth department achieved great success in this period and won the juniors tournament in 1928, 1929, 1930, 1932, 1933, 1937 and 1938.

[6] During the 1940s, a new generation of talented players such as Knud Bastrup-Birk, Georg Dahlfeldt and Karl Aage Hansen were raised, which helped ensure AB great success in the following years.

[5] After pulling and opposition among both the members of AB and Bagsværd Idrætsforening, the two clubs held a founding general assembly on January 17, 1962, where the association became a reality.

From then on, AB had training facilities at Skovdiget in Bagsværd and the first-team squad's home matches were played on Gladsaxe Stadium.

A large part of the team later went on to play on the club's first-team squad, which won AB's latest Danish Championship in 1967 under the leadership of Mario Astorri.

The decision to introduce professional football in Denmark in 1978 became tough for AB, as the club struggled to adapt to the new reality.

[2] After a couple of seasons in 1st Division, Tonni Nielsen was appointed as new coach in AB in 1996, and he helped lead the team to the cup final.

The success of the team culminated in 1999 when AB ended on a third place in the league and became Danish Cup Champions after having won 2–1 against AaB.

This process was initiated by the three new board members Bent Jakobsen, Denis Jørgen Flemming Holmark and Torben Mærsk who in short time raised large capital sums through a stock exchange introduction of the club.

[9] In the 1997/98 season, the board introduced full-time professionalism in AB, and great efforts were made to achieve success in the league with the appointment of Christian Andersen as head coach and with the purchase of several profiles.

The board wanted to make AB a power factor in Danish football again through a business plan based on buying and selling players, sporting success, TV revenues, entrance fees, merchandise sales and talent development.

At the same time, a drastic expansion of Gladsaxe Stadium, which was intended to create a foundation for a modern football business, was initiated.

The slimming meant, however, that the club had to sell the last profiles such as Nicolai Stokholm, Rasmus Daugaard, Mohamed Zidan and Stephan Andersen.

[21] Whilst the game saw AB lift the Danish 2nd Division trophy after the final whistle, it also proved a poignant moment for the club with a number of well regarded players, including cult hero Simon Bræmer, saying their farewells.

[23] AB currently has about 1,500 members and a profiled youth division which has raised talents such as Nicolai Jørgensen, Oliver Lund, Klaus Lykke and Lukas Lerager.

As of 1 February 2025[42] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

During home matches, the fan club stands on Gladsaxe Stadium's section E. The work on founding fan club started already in the spring of 1993 when a group of youth coaches increasingly felt frustrated over the fact that AB's youth players did not come to the stadium when AB's first team played matches.

AB played in the 3rd tier under the leadership of Johnny Petersen and had great players such as René Henriksen and Peter Rasmussen on the team.

The group who later established the fan club got its name from the first team's most dangerous player, the striker Finn Buchardt who has scored 62 goals for AB.

[2] In the following years, the fan club took the initiative to produce and sell merchandise in the form of caps, scarves and T-shirts.