The building, located in Jakarta, is also home to a local World Bank office on the 12th and 13th floors.
A spokesman for the national police said that numerous injured were college students on a tour, according to the Associated Press.
An Indonesian worker attends one of evacuated victims after a structure inside the Jakarta Stock Exchange tower collapsed in Jakarta, Indonesia, Monday, Jan. 15, 2018.
Police confirmed that at least 72 people were injured by the incident and are now being treated in three separate hospitals, although there have been no fatalities.
Almost 80 people were injured after a floor in an Indonesian stock market unexpectedly collapsed.More news: Rahul Gandhi on first visit to Amethi after becoming Congress president
The accident happened shortly after noon local time while the market was on its lunchtime break.
Earlier, Jakarta police spokesman Argo Yuwono told the Straits Times that police were still investigating and were on the scene. It didn't appear overcrowded either; a few dozen people were standing in front of the elevators, mainly university students, certainly not in numbers that should have exceeded normal capacity in a properly built facility.
National police spokesman Setyo Wasisto ruled out terrorism as a cause of the collapse.
IDX president director Tito Sulistio said fewer than 20 people were injured.
Footage aired by TV stations showed several people lying on the ground and being carrying outside the building. "I saw a lady unconscious stuck under slab of concrete", she said, adding that the collapsed level was just above the reception desk.
The cause of the collapse is unknown, but initial reports do not point to a terrorist attack.