It was not until 1 February 1908 that the building was formally inaugurated, in the presence of King Gustaf V and other members of the royal family.

The International Section originally existed in Norra Real (an upper-secondary school in Stockholm), but it was transferred to Kungsholmens gymnasium in 1987.

Simultaneously the building was further expanded towards the east, and underground parking spaces built under the school replacing the old bomb shelters.

The minimum admission requirements to enter these programmes are consistently some of the highest in the Stockholm County, making them highly competitive.

[13] The Music Section offers modified Natural and Social Science programmes that include advanced choral courses.

Admission to this programme is also highly competitive and accepts students based on a combination of grade point average, singing auditions and tests in music theory.

[18] The Service committee deals with the economic matters which affect the student body, from the selling of school branded apparel to acquiring corporate sponsorship.

[19] 2018 the Union together with KGIF and Östra Real arranged one of the largest indoor American football games in Europe.

KZINE developed from the website Kungsholmen Unofficial Webpage (KIWS), an internet site created in 1998 by a student.

[3] In 2008 KZINE won the youth journalism prize Lilla journalistpriset for best web-based student publication (in the upper-secondary school class).

[20] In December 2013 a KZINE article about political censorship of a school class photograph attracted wider media attention in the news publications Expressen and Nyheter24, among others.

[21][22] In November 2018, KZINE was nominated for the Swedish School news paper of the year by Sveriges Tidskrifter.

Several prominent Swedish people have received their schooling at Kungsholmens gymnasium, including cultural personalities.