With about 14 percent of votes having been sorted out, the ANC's share of votes stood at 42.6 percent, while the main opposition Democratic Alliance (DA) got 25.8 percent.
The Economic Freedom Fighters (EFF) party garnered 8.5 percent of the total.
Opinion polls show that the ANC, which was founded by Nelson Mandela, is expected to lose the parliamentary majority has controlled since 1994, forcing it to seek an alliance with other political parties.