Ibovespa Ends Four-Week Winning Run as CSN Leads Steel Sell-Off

The Ibovespa ended a four-week winning streak on Friday, 18 September 2026, sliding 1.06% after trading between 184,460.91 and 185,991.47 to close at 185,229.17. The move followed expiry of B3 equity options and uncertainty around Brazil’s presidential race and domestic interest-rate decisions. Market commentary cited weakening support from major blue-chip names, high local rates, and inflation concerns tied to the September IGP-M release. In the dollar, the currency index was nearly flat. In São Paulo, CSN (CSNA3) drove the sell-off, dropping 12.16% over five sessions, with Reuters pointing to no clear news on asset sales.