The US-Israel strike on Iran didn't just rattle oil markets. For the semiconductor industry — and everyone betting on AI infrastructure — it exposed a set of supply chain dependencies that few investors had thought much about until last week.
TSMC, Samsung Electronics, and SK Hynix shares fell between 9% and 22% from recent highs. The immediate driver was crude: Brent briefly cleared $100 a barrel before settling around $87, and the US Energy Information Administration expects prices to hold above $95 for at least two more months. Morningstar analyst Phelix Lee puts energy costs at 3–6% of projected 2025 revenue for the major chipmakers — a meaningful number that rises quickly if the conflict lingers. Data centers running the GPU clusters behind large language models and agent workloads are far more electricity-intensive than traditional server infrastructure, so elevated crude prices ripple through even where oil isn't the primary generation source.
The more unsettling risks, though, aren't about electricity bills. Qatar's LNG export terminal has been shut down amid the fighting, and Qatar supplies roughly a third of the world's helium — a byproduct of LNG processing that chipmakers depend on to purge oxygen from fabrication environments. Without it, production lines don't run. A prolonged disruption wouldn't just raise costs; it could force fabs to idle.
South Korea has its own exposure. Around 98% of the bromine used in Korean chip production originates in Israel. Shipments haven't been cut off yet, but analysts are watching closely. Bromine-based compounds appear at several steps in memory chip manufacturing — the kind Samsung and SK Hynix produce at scale.
For now, chipmakers can probably pass higher costs to customers; AI chip supply remains tight enough to give manufacturers pricing power. But a prolonged conflict, and the disruptions that could follow, would eventually force hyperscalers to reckon with the buildout timelines they've been promising investors — putting a hard, geopolitical ceiling on an infrastructure race that until recently looked unstoppable.