# Ibovespa volatility amid US-Iran tensions and oil surge > Live situation record from CLSTR: https://clstr.news/situations/brazilian-ibovespa-stock-market-performance > Updated: 2026-09-10T12:10:19.000Z. Sources: 418. Developments: 5. The Ibovespa index remains under pressure, with the mini index falling 0.8% as it operates below key moving averages. Analysts at BTG Pactual suggest that if the index fails to recover the 188,300 level, a deeper correction toward 186,000 points may occur, despite an overall upward long-term trend. In the currency market, the Brazilian mini dollar closed up 0.26% at 5,127.5 points, while the spot dollar rose 0.44% to R$ 5.114. This movement is linked to international tensions between the United States and Iran, rising U.S. Treasury yields, and a negative exchange flow of US$ 6.693 billion. Geopolitical instability in the Middle East continues to drive energy market volatility. Brent crude has approached $110 per barrel following reports of the U.S. striking five Iranian oil tankers and Iran claiming attacks on ten vessels near the Strait of Hormuz. Maritime security risks have escalated due to Houthi control of the Yemeni port of Mocha, threatening the Bab el-Mandeb Strait. These disruptions have contributed to an energy crisis in the United States, where diesel prices have exceeded $6 per gallon for the first time. Global inflationary concerns persist, supported by the U.S. Producer Price Index rising 5.4% annually in August. As of September 10, vessel traffic through the Strait of Hormuz has significantly declined, falling to just seven vessels compared to a previous average of 15, raising fears of long-term supply disruptions. Consequently, global oil prices have surged, with Brent crude approaching $110 and WTI exceeding $103. These shifts have placed downward pressure on Wall Street and European exchanges due to rising energy costs and heightened risk aversion. ## Claims - The Ibovespa index closed up 1.3% at 179,722.48 points. (disputed by 19 sources) - The US dollar closed down 0.54% at R$ 5.15. (disputed by 19 sources) - Brent crude oil rose 4.6% to US$ 94.65 per barrel. (disputed by 18 sources) - The US Producer Price Index (PPI) rose 5.4% annually in August. (disputed by 14 sources) - Brent crude oil rose 6% to reach $107 per barrel. (disputed by 8 sources) - The Ibovespa index rose 3.05% to 185,205.09 points on Wednesday. (disputed by 7 sources) - Petrobras shares rose over 4%. (disputed by 6 sources) - The US dollar closed at R$ 5.106, a decrease of 0.91%. (disputed by 5 sources) - Petrobras shares rose, with PETR4 increasing by 1.30%. (disputed) - The IRGC captured an advanced unmanned US submarine near the entrance to the Strait of Hormuz during a dawn operation. (corroborated by 22 sources) - Global oil prices rose due to Middle East conflicts and threats to oil tankers. (corroborated by 22 sources) - Benchmark Brent crude oil prices have surpassed $100 per barrel. (corroborated by 22 sources) ## Timeline ### 2026-09-10: Brazilian markets react to US-Iran tensions and Ibovespa volatility The Brazilian mini dollar rose amid US-Iran tensions and rising oil prices, while the Ibovespa mini index saw a 0.8% decline, facing potential technical corrections. 2 sources. https://clstr.news/cluster/brazilian-markets-react-to-us-iran-tensions-and-ibovespa-volatility ### 2026-09-09: Oil prices surge above $100 amid U.S.-Iran tensions Oil prices have surged above $100 per barrel amid escalating U.S.-Iran military tensions and maritime threats in the Strait of Hormuz and Red Sea, driving global energy market volatility. 380 sources. https://clstr.news/cluster/ibovespa-falls-below-185000-points-amid-vale-and-banking-declines ### 2026-09-05: Ibovespa outperforms global markets amid foreign capital inflows The Ibovespa outperformed global markets with a 7.6% weekly rise in dollars, aided by R$ 6 billion in foreign inflows and shifting fiscal expectations in Brazil. 2 sources. https://clstr.news/cluster/ibovespa-outperforms-global-markets-amid-foreign-capital-inflows ### 2026-09-01: Ibovespa hits highest level since May amid oil surge and election optimism Brazil's Ibovespa rose 3.05% to its highest level since May, driven by returning foreign investment, oil price surges due to US-Iran tensions, and electoral optimism. 63 sources. https://clstr.news/cluster/oil-prices-surge-amid-us-strikes-in-middle-east-boosting-brazilian-markets ### 2026-08-29: Ibovespa rises 2.71% driven by foreign inflows and lower oil prices The Ibovespa rose 2.71% this week, ending a three-week decline as foreign investors returned to the Brazilian market and falling oil prices eased inflation concerns. 4 sources. https://clstr.news/cluster/ibovespa-rises-271-driven-by-foreign-inflows-and-lower-oil-prices --- Cite as: Ibovespa volatility amid US-Iran tensions and oil surge. CLSTR, https://clstr.news/situations/brazilian-ibovespa-stock-market-performance