Stock Market Today (Sept. 14, 2026): S&P 500 falls on rising oil prices, sagging AI stocks

U.S. equities declined as traders navigated competing headwinds: elevated crude prices, geopolitical strain in the Middle East, and anticipation around this week's Federal Reserve decision. The S&P 500 faced selling pressure in a market caught between energy cost concerns and weakness in the AI sector, which had driven much of the year's gains.

• Oil price gains are pressuring equities as markets factor in potential economic drag from higher energy costs.
• Middle East tensions add to uncertainty, amplifying the typical risk-off tone when geopolitical risks spike.
• The Fed meeting this week looms as a key catalyst; policy direction could reshape positioning across sectors including the struggling AI stocks.