SK Hynix overtakes Samsung as HBM boom reshapes Korea's chip industry

SK Hynix’s brief market cap lead over Samsung reflects not just HBM revenue surges but a structural shift in AI-driven memory architecture. Technically, HBM3E/HBM4 adoption intensifies demand for TSV, hybrid bonding, and CoWoS packaging—tightening TSMC’s (Taiwan, China) capacity and boosting SK’s pricing leverage. However, U.S. export controls on advanced packaging tools have already raised SK’s domestic compliance costs by over 15%. Samsung will likely accelerate HBM3E ramp-up and potentially trigger a DRAM price war, while Micron leverages CHIPS Act subsidies to scale its Arizona HBM line. Over the next 18 months, persistent HBM supply-demand imbalances will widen valuation gaps among leaders. If SK Hynix fails to stabilize HBM yields above 85% by 2027, its current market cap edge may evaporate—investors are betting on technological delta, not legacy scale.