Dow, S&P 500 and Nasdaq open lower as September kicks off with oil spike and yield jitters

September showed up exactly on brand. The Dow Jones Industrial Average, S&P 500, and Nasdaq Composite all opened lower on September 1, extending losses from the final session of August and reminding investors why this particular month has earned its grim seasonal reputation. The sell-off isn’t random. Surging oil prices, multi-month highs in Treasury yields, and simmering geopolitical tensions between the US and Iran have combined into the kind of cocktail that makes portfolio managers reach for antacids. What happened on the last day of August On August 31, all three major indices closed in the red, setting the stage for a shaky September open. The Dow dropped roughly 374 points, falling about 0.59% to close near 53,185.90. The S&P 500 shed between 25 and 27 points, sliding around 0.35% to settle in the neighborhood of 7,685. The Nasdaq gave back about 31 points, dipping approximately 0.15% to close at 26,370.89. West Texas Intermediate crude jumped more than 2% to around $87.81 per barrel. Brent crude climbed 1.8% to approximately $92.15. The trigger was renewed military tensions between the US and Iran, which injected fresh uncertainty into global energy supply expectati...