It is the first taste of real political power for the young protest leaders, who want more independence from China for the former British colony.
Results were delayed by a record turnout, which saw some 58% of 3.8 million registered voters cast their ballots, compared with 45.2% in 2008. Full results are due later on Monday.
Among them is Nathan Law, one of the young leaders of the mass pro-democracy demonstrations of 2014.
A new generation of activists have for the first time won seats on Hong Kong’s Legislative Council (LegCo).
But pro-Beijing politicians will retain a majority in the 70-seat council, partly because of the electoral system.
