Oil Spikes, Stocks Drop as Iran Rejects Ceasefire

U.S. markets reversed course on Thursday as a diplomatic impasse with Iran sent shockwaves through asset prices. The White House transmitted a 15-point peace plan, but Tehran publicly rejected direct negotiations, instead countering with a framework that would grant it sovereign control over the critical Strait of Hormuz. This rejection dashed hopes for a quick de-escalation, leaving markets to price in a protracted conflict with no clear resolution in sight.

The immediate result was a surge in oil prices, with Brent crude jumping 5.4% to breach $107 per barrel and WTI rising over 4%. This spike, coupled with President Trump's comments that Iran "desperately wants to make a deal," anchored energy prices at elevated levels. Concurrently, a separate shock hit the tech sector: Alphabet's publication of AI efficiency research sparked fears of reduced demand for high-end chips and servers, triggering a sharp selloff in semiconductors.

This dual-pronged market move matters because it represents a classic 'stagflation-lite' scare. Rising oil prices directly feed into inflation expectations, which pressures bond yields higher and compresses valuations for long-duration assets like growth and technology stocks. The 10-year Treasury yield climbed, reflecting this renewed inflation anxiety.

The selloff wasn't broad-based; it was highly sector-specific. Energy dominated as the clear winner, with refining margins widening. In stark contrast, the semiconductor and AI infrastructure sector was hammered on fears that more efficient algorithms could reduce the need for massive, expensive hardware builds. This creates a stark divergence in market leadership, forcing a reassessment of sector allocations. The market is signaling that near-term macro risks (oil, inflation) are trumping long-term tech growth narratives.