Tech shares lift global markets while oil slips as Iran war keeps traders on edge

World shares were mostly higher as tech-related buying supported equities, while oil slid on renewed Iran–U.S. tensions after the ceasefire was declared “over.” Brent fell 0.5% to $75.94/bbl and U.S. crude dropped 0.5% to $71.71/bbl amid continued supply tightness through the Strait of Hormuz. Semiconductors led gains—Micron jumped 4.5% citing “surging demand for memory in the AI era,” alongside +5.7% for AMD—while the yen strengthened versus the dollar and the S&P 500 futures were slightly negative (-0.1%).

Analysis

The cleanest winner is the AI supply chain, but the market is separating real operating leverage from pure narrative beta. MU has the most direct earnings sensitivity to memory demand, while MRVL and ON can re-rate on datacenter mix and content per system without needing a blowout spot-price move. SFTBY is the most fragile expression of the theme: if AI capex headlines cool or funding sentiment slips, it can give back gains much faster than the chip names.

The bigger second-order risk is that the oil move is being treated too casually. If shipping through Hormuz remains constrained for another 2-6 weeks, freight, insurance, and inventory costs can rise before Brent fully catches up, which would pressure airlines, chemicals, and import-heavy industrials while keeping inflation sticky. That matters for semis too: even if demand is strong, a firmer energy tape can delay multiple expansion by pushing rate-cut expectations further out.

For Japan, the yen bid is an underappreciated cross-current: local tech winners can still advance in yen terms while USD returns are muted by FX. Contrarian view: the consensus may be overconfident that oil's dip is durable; this looks more like positioning than a resolved supply shock. If Brent reclaims the high-$70s or tanker congestion worsens, the market will likely reprice energy, inflation, and risk assets quickly.

Key Decisions for Investors

• Long MU on any post-open weakness; 4-8 week catalyst window into memory pricing and AI capex commentary. Falsify if management tone turns cautious or spot DRAM/NAND pricing rolls over.
• Pair trade: long MRVL/ON basket vs short XLE for a 1-3 month relative-value expression of AI spend outperforming energy noise. Reduce if Brent settles above $78 or Hormuz headlines intensify.
• Buy 1-2 month Brent call spreads as a geopolitical tail hedge while spot is still discounting the supply risk. Close if Brent falls back below $73 and shipping constraints ease.
• Treat SFTBY as tactical only; chase risk is poor after the spike. Best entry is a 5-7% pullback or a confirmed follow-through in OpenAI/AI financing headlines.
• Prefer TOELY over SFTBY for cleaner AI capex leverage, but hedge JPY if holding in USD terms. A stronger yen is the main reason the local equity move can underdeliver in dollar returns.