JPMorgan's trading desk has issued a warning that escalating tensions in the Middle East could lead to a 10% decline in the S&P 500. Andrew Tyler, Head of Global Market Intelligence at JPMorgan, highlighted concerns over the lack of de-escalation in the region and rising oil prices, which have surpassed $100 per barrel. This has prompted a shift to a "tactically bearish" stance on U.S. equities. Tyler noted that current investor positions are not prepared for a downturn, with overall positioning remaining neutral. Despite expectations of de-escalation, traders net sold energy stocks last week. However, oil prices have surged following production cuts by Gulf nations, raising fears of prolonged supply disruptions and stagflation. Tyler suggests that these risks could quickly dissipate if the conflict does not persist, as macro fundamentals still support risk assets.