U.S. stocks opened lower Monday as renewed U.S.-Iran hostilities pushed Brent crude above $90 a barrel and lifted Treasury yields, reviving concerns that higher energy costs could complicate the Federal Reserve’s inflation fight. The Dow fell 97.4 points, or 0.18%, to 53,462.6 at the opening bell, while the S&P 500 dropped 0.18% to 7,697.52 and the Nasdaq Composite slipped 0.17% to 26,358.56. Brent crude rose more than 2%, U.S. crude approached $86.40 and the 10-year Treasury yield moved near 4.75%. Higher yields can weigh on stocks by raising financing costs and reducing the present value of future corporate earnings. Mark Minervini’s cycle composite, combining one-year seasonal, four-year presidential and 10-year decennial patterns, points to historically weaker performance from mid-August into early October, but he treats cycles as context rather than a standalone trading signal. The Dow’s short-term technical setup also remained cautious: the index was around 53,440, below resistance at 53,780 and 53,940, with support near 53,160 and 53,000. After a strong August, investors face a busy economic calendar culminating in Friday’s August employment report, alongside JOLTS job openings, manufacturing data, ADP employment figures, weekly jobless claims and services-sector readings. The near-term market test is whether oil and yields remain elevated; retreating yields and continued support in leading stocks could instead allow price action to outweigh the seasonal warning.